CN103422846A - Open hole horizontal well completion fracturing integrated pipe column - Google Patents

Abstract

The utility model provides an open hole horizontal well completion fracturing integration tubular column, includes butt joint oil pipe, liner hanger, a plurality of fracturing structures, packer, pressure differential sliding sleeve and the float shoe that is connected. Wherein: fracturing structure comprises meeting water packer and undergauge sliding sleeve that is connected, and the undergauge sliding sleeve includes: the upper joint, the outer sleeve and the lower joint are connected; a reducing mechanism and a positioning mechanism are arranged in the outer sleeve in a penetrating manner, the reducing mechanism is provided with an upper sliding sleeve and a lower sliding sleeve which are connected, a push rod is arranged in the upper sliding sleeve in a penetrating manner, and a telescopic ball seat is arranged between the push rod and the lower sliding sleeve; the positioning mechanism is provided with a connecting cylinder, a sliding cylinder and a base are arranged in the connecting cylinder in a penetrating mode, a positioning rod and a piston are clamped between the base and the connecting cylinder, and the upper end of the sliding cylinder is clamped in a clamping groove of the positioning rod. According to the open hole horizontal well completion and fracturing integrated tubular column, the reducing sliding sleeves can be provided with a plurality of reducing sliding sleeves, the reducing sliding sleeves of a plurality of intervals can be opened through the balls with the same diameter, so that the requirement of improving a plurality of oil layers of a horizontal well section is met, and the tubular column is simple in structure and convenient to install and construct.

Description

The fracturing integrated tubing string of open-hole horizontal well completion

Technical field

The present invention is relevant for the fracturing integrated tubing string of a kind of oilfield well completion, especially relevant for a kind of fracturing integrated tubing string of open-hole horizontal well completion that the oil field open-hole horizontal well is carried out to the completion pressure break.

Background technology

At present, the oil field open-hole horizontal well mainly adopts " open hole packer+pitching sliding sleeve " step by step fracturing string to carry out completion and pressure break.For example, Chinese patent provides horizontal well completion fracturing integrated pipe column for No. 200920248979.9, it mainly is comprised of safety valve, hydraulic anchor, insertion sealed device, tail tube hanging sealer, tail pipe, expanding open hole packer, pitching sliding sleeve, pressure sliding sleeve, float shoe sliding sleeve, the activities of its completion pressure break is as follows: at first, connect fracturing integrated tubing string by well drilling pipe column after boring completion, fracturing integrated tubing string is sent in horizontal bare hole well section, the extension hanger on fracturing integrated tubing string top is hung in the well cementing casing pipe of top; Secondly, top rod is hung to sealing place dropout by tail pipe and take out, the pipe tubing string of again changing oil inserts tail pipe and hangs, and guarantees this place's good seal; Finally, drop into the ball sealer of ascending different-diameter by well head, complete unlatching and pressure break to each layer of pitching sliding sleeve.

But above-mentioned horizontal well completion fracturing integrated pipe column also exists following a few point defect to have much room for improvement:

1, the open hole packer of this horizontal well completion fracturing integrated pipe column adopts the mechanical compression type packer mostly, and it sets principle is that the interior hydraulic drive packer piston of tube post is realized setting of oil jacket annular space, and its mechanical part is more, easily the sand card; And, the restriction of the rubber material adopted due to this open hole packer, it is not suitable for irregular barefoot interval is sealed.

2, the size of pitching sliding sleeve is subject to the restriction of pitching size, and for meeting the pitching sliding sleeve at diverse location place in the open water horizontal well, the pitching size need increase step by step.When a plurality of oil reservoirs to net horizontal section are transformed pressure break, a plurality of pitching sliding sleeves of installing on horizontal well completion fracturing integrated pipe column, its size will increase step by step along with increasing of oil reservoir quantity, but, the size of pitching sliding sleeve can not infinitely increase, can cause like this size of fractured horizontal well tubing string to increase, not only can increase the production operation cost, and operating risk is also higher, therefore, the pitching sliding sleeve adopted on the fractured horizontal well tubing string of prior art can't meet the requirement of multiple zone being transformed to pressure break, it can not meet the needs of current oil gas field development.

Therefore, be necessary to provide a kind of new horizontal well completion fracturing integrated tubing string, overcome above-mentioned defect.

Summary of the invention

The purpose of this invention is to provide the fracturing integrated tubing string of a kind of open-hole horizontal well completion, undergauge sliding sleeve on it can be provided with a plurality of, by diameter, identical ball can be opened the undergauge sliding sleeve of a plurality of intervals, to meet the requirement that the net horizontal section multiple zone is transformed, the fracturing integrated tubular column structure of this open-hole horizontal well completion is simple, installs and easy construction.

Above-mentioned purpose of the present invention can adopt following technical proposal to realize:

The invention provides the fracturing integrated tubing string of a kind of open-hole horizontal well completion, the fracturing integrated tubing string of described open-hole horizontal well completion comprises:

The docking oil pipe, it is located in the sleeve pipe of Vertical Well section of horizontal well;

Extension hanger, it is connected with described docking oil pipe, and described extension hanger hangs on described sleeve pipe;

A plurality of pressure break structures, it is connected on described extension hanger and is positioned at the net horizontal section of described horizontal well, and each described pressure break structure series connection is connected, and it comprises chance water packer and the undergauge sliding sleeve be connected; Wherein, described undergauge sliding sleeve comprises:

Top connection, its upper end is connected with described chance water packer, and its lower end is connected with overcoat, and the lower end of described overcoat is connected with lower contact, and the upper end of described overcoat offers the pressure break hole;

Undergauge mechanism, it has and wears the upper sliding sleeve be connected in described overcoat, the upper end of described upper sliding sleeve offers flowing hole, its lower end is connected with low sleeve, wear and be connected with push rod in described upper sliding sleeve, between described push rod and described low sleeve, be folded with flexible ball seat, the lower end of described upper sliding sleeve offers inlet opening, be formed with admission chamber between described push rod and described upper sliding sleeve, described inlet opening is connected with described admission chamber;

Detent mechanism, it is positioned at the below of described undergauge mechanism, described detent mechanism has the connecting cylinder be located in described overcoat, be equipped with sliding cylinder and pedestal in described connecting cylinder, described sliding cylinder can axially movably be located in the upper end of described pedestal, the lower end of described pedestal is connected with described lower contact, be folded with backstay and piston between described pedestal and described connecting cylinder, the inboard, upper end of described backstay is axially arranged with a plurality of draw-in grooves, the upper end of described sliding cylinder is fastened in described draw-in groove, and described piston is connected on described connecting cylinder;

Wherein, described connecting cylinder with offer respectively the relative fluid hole of level and inlet opening on described pedestal, described piston is provided with radial direction through hole, in the upper end of described sliding cylinder, be fastened under the state of the described draw-in groove that is positioned at top in a plurality of described draw-in grooves, the inlet opening of described fluid hole, described radial direction through hole and described pedestal is connected;

The pressure reduction sliding sleeve, the one end is connected with described a plurality of pressure break structures by packer, and its other end is connected with float shoe.

In a preferred embodiment, the upper end of the connecting cylinder of described undergauge sliding sleeve is connected with spool, and described low sleeve is set in the upper end of described spool slidably, and the lower end of described spool is located in described sliding cylinder.

In a preferred embodiment, described upper sliding sleeve is connected to described outer putting by shear pin, the lower end of described low sleeve radially inwardly convexes with location division, at described shear pin, cut off, and the upper end contact of described spool is under the state of described location division, and described pressure break hole is connected with described flowing hole.

In a preferred embodiment, described connecting cylinder comprises the first connecting cylinder and the second connecting cylinder, and described the first connecting cylinder is connected to the upper end of described the second connecting cylinder, and described piston is connected on described the second connecting cylinder by shear pin.

In a preferred embodiment, the upper end of described lower contact is connected with excessive head, and described excessive head is located in described overcoat, and the lower end of described pedestal, the lower end of described connecting cylinder are connected on described excessive head.

In a preferred embodiment, be folded with spring between described sliding cylinder and described pedestal.

In a preferred embodiment, the upper end of described sliding cylinder radially outward convexes with snap fit, and described snap fit is fastened in described draw-in groove, and the lower end of described sliding cylinder radially inwardly convexes with sits the ball pawl.

In a preferred embodiment, described push rod is connected on described upper sliding sleeve by shear pin, be formed with container cavity between described upper sliding sleeve and described overcoat, be formed with annular chamber between described connecting cylinder and described overcoat, described container cavity is connected with described annular chamber, at the inlet opening of described fluid hole, described radial direction through hole, described pedestal, described annular chamber and described container cavity, be connected, and, under the state that described shear pin is cut off, the described flexible ball seat of described push rod pushing and pressing radially moves inwardly into the seat ball position.

In a preferred embodiment, the inside wall of described connecting cylinder is provided with latch, and the outside, lower end of described backstay is connected with the lock ring latch, and described lock ring latch matches with described latch.

In a preferred embodiment, the fracturing integrated tubing string of described open-hole horizontal well completion comprises three described pressure break structures, the backstay of the undergauge sliding sleeve of each described pressure break structure is provided with four described draw-in grooves, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described horizontal well well head place is fastened in four draw-in grooves of described backstay and is positioned at draw-in groove bottom, the upper end of the sliding cylinder of the undergauge sliding sleeve of the described pressure break structure in the middle of being arranged in three described pressure break structures is fastened on four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove top bottom, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described pressure reduction sliding sleeve place is fastened in four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove below topmost.

In a preferred embodiment, between described extension hanger and described a plurality of pressure break structure, also be connected with packer, described packer is for meeting water packer.

Characteristics and the advantage of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention are:

One, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, adopt the undergauge sliding sleeve to carry out fracturing work to each oil reservoir of down-hole, when a plurality of oil reservoirs in down-hole are carried out to fracturing work, a plurality of undergauge sliding sleeves that are connected in series, by from well head, dropping into the identical ball of diameter, just can open in turn the undergauge sliding sleeve of a plurality of oil layer sections, the unlatching of this undergauge sliding sleeve is not subject to the restriction of pitching diameter, it not only can increase the transformation progression of oil reservoir, and guaranteed the large latus rectum of tubing string, reduce operating risk, facilitated the operation that is lowered to of later stage instrument.The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, simple in structure, it is convenient to install with constructing operation, and it has shortened completion and pressure break time greatly, has reduced operating risk, has guaranteed the large latus rectum of tubing string, facilitates the operation that is lowered to of later stage instrument.

Two, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, adopt and meet water packer packing oil jacket annular space, with existing bore hole compression packer, compares, and has the safety of setting, and adapts to the characteristics of irregular borehole.

Three, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, be connected to the chance water packer of extension hanger lower end, can effectively stop the impact of inclination section water layer on the horizontal segment oil reservoir.

The accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

The structural representation that Fig. 1 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.

The half sectional view that the undergauge sliding sleeve that Fig. 2 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention is not opened.

The half sectional view of the undergauge sliding sleeve state one that Fig. 3 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.

The half sectional view of the undergauge sliding sleeve state two that Fig. 4 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.

The half sectional view of the undergauge sliding sleeve state three that Fig. 5 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.

Half sectional view after the undergauge sliding sleeve that Fig. 6 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention is opened.

The specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.

As shown in Figure 1, 2, the invention provides the fracturing integrated tubing string of a kind of open-hole horizontal well completion, it comprises docking oil pipe 1,extension hanger 2, a plurality ofpressure break structure 3 and pressure reduction sliding sleeve 4.Wherein: docking oil pipe 1 is located in thesleeve pipe 5 ofVertical Well section 91 of horizontal well;Extension hanger 2 is connected with described docking oil pipe 1, and describedextension hanger 2 hangs on describedsleeve pipe 5; A plurality ofpressure break structures 3 are connected on describedextension hanger 2 and are positioned at the nethorizontal section 92 of described horizontal well, and each describedpressure break structure 3 series connection is connected, and it compriseschance water packer 6 and the undergauge slidingsleeve 7 be connected; One end of pressurereduction sliding sleeve 4 is connected with described a plurality ofpressure break structures 3 by packer, and its other end is connected withfloat shoe 8.

Wherein, described undergauge slidingsleeve 7 comprisestop connection 71,undergauge mechanism 72 and detent mechanism 73.The upper end oftop connection 71 is connected with describedchance water packer 6, and its lower end is connected withovercoat 74, and the lower end of describedovercoat 74 is connected withlower contact 75, and the upper end of describedovercoat 74 offerspressure break hole 741,undergauge mechanism 72 has and wears the upper slidingsleeve 721 be connected in describedovercoat 74, the upper end of described upper slidingsleeve 721 offers flowinghole 7211, its lower end is connected withlow sleeve 722, wear and be connected withpush rod 723 in described upper slidingsleeve 721, be folded withflexible ball seat 724 between describedpush rod 723 and describedlow sleeve 722, the lower end of described upper slidingsleeve 721 offers inlet opening 7212, be formed withadmission chamber 7213 between describedpush rod 723 and described upper slidingsleeve 721, described inlet opening 7212 is connected with describedadmission chamber 7213,detent mechanism 73 is positioned at the below of describedundergauge mechanism 72, describeddetent mechanism 73 has the connectingcylinder 731 be located in describedovercoat 74, be equipped with slidingcylinder 732 andpedestal 733 in described connectingcylinder 731, described slidingcylinder 732 can axially movably be located in the upper end of describedpedestal 733, the lower end of describedpedestal 733 is connected with describedlower contact 75, be folded withbackstay 734 andpiston 735 between describedpedestal 733 and described connectingcylinder 731, the upper end inner shafts of describedbackstay 734 is to offering a plurality of draw-ingrooves 7341, the upper end of described slidingcylinder 732 is fastened in described draw-ingroove 7341, describedpiston 735 is connected on described connectingcylinder 731, wherein, described connectingcylinder 731 offers respectively levelrelative fluid hole 7311 and inlet opening 7331 with on describedpedestal 733, offer radial direction throughhole 7351 on describedpiston 735, in the upper end of described slidingcylinder 732, be fastened under the state of the described draw-in groove 7341 ' that is positioned at top in a plurality of described draw-ingrooves 7341, the inlet opening 7331 of describedfluid hole 7311, described radial direction throughhole 7351 and describedpedestal 733 is connected.

Specifically, theVertical Well section 91 of horizontal well is bysleeve pipe 5 well cementing of cement, and thissleeve pipe 5 comprisessurface pipe 51 andprotective casing 52, andsurface pipe 51 is connected to the upper end of protective casing 52.Docking oil pipe 1 is located insurface pipe 51 andprotective casing 52, and its lower end is connected withextension hanger 2, and thisextension hanger 2 is suspended onprotective casing 52.

A plurality ofpressure break structures 3 are connected in series onextension hanger 2 successively, it is positioned at the nethorizontal section 92 of horizontal well, eachpressure break structure 3 is bymeeting water packer 6 and undergauge slidingsleeve 7 compositions,chance water packer 6 is connected to the upstream extremity of undergauge slidingsleeve 7, the downstream of a plurality ofpressure break structures 3 is connected withfloat shoe 8 with pressurereduction sliding sleeve 4 by packer, in the present invention, the packer be connected between a plurality ofpressure break structures 3 and pressurereduction sliding sleeve 4 can bechance water packer 6.

Wherein, the chance water packer 6 of above-mentionedpressure break structure 3 is chance water packer well known in the prior art, and its concrete structure does not repeat them here.This meetswater packer 6 for packing oil jacket annular space, it is met water and just can self-expanding set, and without suppressing, sets, and sets safe and reliable, thischance water packer 6 can effectively solve the sand card problem of mechanical packer, and is applicable to irregular barefoot interval is sealed.

Refer to shown in Fig. 2, the undergauge slidingsleeve 7 of above-mentionedpressure break structure 3 is relative with the oil reservoir of the nethorizontal section 92 of horizontal well, by from the well head pitching, opens undergauge slidingsleeve 7, so that nethorizontal section 92 each oil reservoirs are carried out to fracturing work.This undergauge slidingsleeve 7 has connected successivelytop connection 71, overcoat 74 andlower contact 75, the upper end oftop connection 71 is connected withchance water packer 6, the upper end ofovercoat 74 is threaded in the inboard, lower end oftop connection 71, the lower end ofovercoat 74 is threaded in the outside, upper end oflower contact 75, therebytop connection 71, overcoat 74 andlower contact 75 are combined into a body that substantially is cylindrical tube shape, and this body has can reach thecentre bore 76 that pitching is passed through for liquid.Wherein, on the sidewall of the upper end ofovercoat 74, offerpressure break hole 741, the fracturing fluid that horizontal well nethorizontal section 92 each oil reservoirs is carried out to fracturing work is under thesepressure break hole 741 Injection Wells in each oil reservoir.

Theundergauge mechanism 72 of undergauge slidingsleeve 7 is located in theovercoat 74 of undergauge slidingsleeve 7, in the present invention, the upper slidingsleeve 721 of thisundergauge mechanism 72 is connected to the inboard, upper end ofovercoat 74 byshear pin 7214 and blocks thepressure break hole 741 ofovercoat 74, the upper end of this upper slidingsleeve 721 is sticked on the inside wall ofovercoat 74, the upper end of upper slidingsleeve 721 offers flowinghole 7211, be formed withcontainer cavity 7215 between the inside wall of its lower end andovercoat 74, the inlet opening 7212 that upper slidingsleeve 721 lower ends are offered is connected withcontainer cavity 7215;Push rod 723 is connected to the inboard, lower end of upper slidingsleeve 721 byshear pin 7231, theadmission chamber 7213 formed between the lower end ofpush rod 723 and upper slidingsleeve 721 is connected withcontainer cavity 7215 by the inlet opening 7212 that is opened in upper slidingsleeve 721 lower ends;Low sleeve 722 is threaded in the inboard, lower end of upper slidingsleeve 721, is folded withflexible ball seat 724 between the upper end oflow sleeve 722 and push rod 723.In the present invention, thisflexible ball seat 724 is c-shaped ring-type substantially, and when theflexible ball seat 724 ofpush rod 723 axial downward movement extruding, external diameter and the internal diameter offlexible ball seat 724 all radially inwardly dwindle, andflexible ball seat 724 will enter setting position.

Thedetent mechanism 73 of undergauge slidingsleeve 7 is located in theovercoat 74 of undergaugesliding sleeve 7, and it is positioned at the below of undergauge mechanism 72.In the present invention, the connectingcylinder 731 of thisdetent mechanism 73 is comprised of the first connectingcylinder 7312 and the second connectingcylinder 7313, the first connectingcylinder 7312 is threaded in the upper end of the second connectingcylinder 7313, thefluid hole 7311 of connectingcylinder 731 is opened in the lower end of the second connectingcylinder 7313, be formed withannular chamber 7314 between this connectingcylinder 731 andovercoat 74, thecontainer cavity 7215 formed betweenannular chamber 7314 and uppersliding sleeve 721 andovercoat 74 is connected.In the present embodiment, the upper end of the connectingcylinder 731 of undergaugesliding sleeve 7, be also the upper end of the first connectingcylinder 7312, is connected withspool 736, thelow sleeve 722 ofundergauge mechanism 72 sealing shroud slidably is located at outside the upper end ofspool 736, and the sealing of the lower end ofspool 736 is located in slidingcylinder 732.

The slidingcylinder 732 ofdetent mechanism 73 andpedestal 733 are located in connectingcylinder 731, slidingcylinder 732 can seal the inboard, upper end that is located inpedestal 733 axially slidably, in the present embodiment, be folded withspring 737 between slidingcylinder 732 andpedestal 733, by the resilient force ofspring 737, slidingcylinder 732 is moved relative topedestal 733 axial reciprocatings.In the present invention, the upper end of slidingcylinder 732 radially outward convexes withsnap fit 7321, and its lower end radially inwardly convexes with sitsball pawl 7322.

In one embodiment of this invention,lower contact 75 upper ends of undergauge slidingsleeve 7 have been threaded excessive 738, be located in for excessive 738 inovercoat 74, the lower end of the second connectingcylinder 7313 of the lower end ofpedestal 733 and connectingcylinder 731 is threaded in respectively the outside, upper end of excessive 738, thereby form acontainer cavity 739 between connectingcylinder 731, slidingcylinder 732,pedestal 733 and excessive 738,backstay 734 andpiston 735 are arranged in this container cavity 739.Wherein,backstay 734 is folded between the first connectingcylinder 7312 of slidingcylinder 732 and connectingcylinder 731, and thesnap fit 7321 of slidingcylinder 732 upper ends is fastened in one of them draw-ingroove 7341 in a plurality of axial draw-ingroove 7341 of offering backstay 734 inboards, upper end; Piston 735 is folded between the second connectingcylinder 7313 ofpedestal 733 and connectingcylinder 731,piston 735 is sealedly connected on the inside wall of the second connectingcylinder 7313 byshear pin 7352, and contact with the lateral wall sealing ofpedestal 733,piston 735 blocks respectively the inlet opening 7331 ofpedestal 733 and thefluid hole 7311 of the second connectingcylinder 7313, now, the radial direction throughhole 7351 of offering onpiston 735 is not connected with inlet opening 7331 andfluid hole 7311.

When needs unlatchingundergauge sliding sleeve 7 carries out fracturing work, at first, as shown in Figure 2 undergauge slidingsleeve 7 is assembled, make the upper end snap fit 7321 of the slidingcylinder 732 of undergauge slidingsleeve 7 be fastened on thatbackstay 734 inboards, upper end offer except in any draw-ingroove 7341 of top draw-in groove 7341 ', now, undergaugesliding sleeve 7 is in opening not; Then, by oil reservoir position under undergauge slidingsleeve 7 lower going-into-wells, from the well head pitching, liquid in tubing string is also sat spherical zone to be located on theseat ball pawl 7322 of slidingcylinder 732 in thecentre bore 76 of undergauge slidingsleeve 7, now, owing to sittingball pawl 7322 nearpedestal 733 inwall settings, can't strut by the restrictionseat ball pawl 7322 ofpedestal 733 inwalls; When the liquid displacement in the centre bore 76 of undergauge slidingsleeve 7 increases, shown in figure 3, the effect ofball 10 liquid body pressure will axially move down,ball 10 drives together axial downward movement of slidingcylinder 732, now,spring 737 is subject to compressing of slidingcylinder 732 compressed, sitsball pawl 7322 and shifts outpedestal 733 inwalls softened, andball 10 drops down; Meanwhile, the snap fit 7321drive backstays 734 of slidingcylinder 732 upper ends axially move down.Refer to shown in Fig. 4, whenfirst ball 10 from slidingcylinder 732 through and drop after, under the elastic-restoring force effect ofcompression spring 737, slidingcylinder 732 is returned back to original position by ejection again, now, theseat ball pawl 7322 of slidingcylinder 732 comes back to original position, and thesnap fit 7321 of slidingcylinder 732 upper ends will be from the initialinterior groove 7341 that is positioned atgroove 7341 tops that initial card establishes that axially is moved upward to of thegroove 7341 of establishing that blocks, to wait for pitching next time.

As shown in Figure 5, by that analogy, drop into successively the second ball that diameter is identical in undergauge slidingsleeve 7, the 3rd ball etc., make slidingcylinder 732 drive the axial down sliding ofbackstay 734, until the lower end ofbackstay 734 contacts with the upper surface ofpiston 735, now,piston 735 at the pressure-acting lower shaft ofbackstay 734 to moving down, theshear pin 7352 that connectspiston 735 and the second connectingcylinder 7313 is cut off,piston 735 glides, untilball 10 comes off in theseat ball pawl 7322 of slidingcylinder 732, now, the inlet opening 7331 ofpedestal 733, the radial direction throughhole 7351 ofpiston 735, thefluid hole 7311 of the second connectingcylinder 7313 is connected.Liquid in undergauge slidingsleeve 7centre bores 76 is by the inlet opening 7331 ofpedestal 733, the radial direction throughhole 7351 ofpiston 735, thefluid hole 7311 of the second connectingcylinder 7313 enters in theannular chamber 7314 between connectingcylinder 731 and overcoat 74, thereby enter in thecontainer cavity 7215 of upper slidingsleeve 721 and overcoat 74 formation, and enter inadmission chamber 7213 through the inlet opening 7212 of upper slidingsleeve 721,push rod 723 is axial down sliding under the effect of hydraulic pressure, cut off theshear pin 7231 betweenpush rod 723 and upper slidingsleeve 721, inadmission chamber 7213 under the continuous effect of hydraulic pressure, theflexible ball seat 724 ofpush rod 723 pushing and pressing radially moves inward, the external diameter offlexible ball seat 724 and internal diameter dwindle and enter the state of setting.

As shown in Figure 6, again from well head pitching 10 ', ball 10 ' falls inflexible ball seat 724 and sets, now, strengthen the hydraulic pressure incentre bore 76, when the hydraulic pressure incentre bore 76 reaches certain numerical value, by theshear pin 7214 of cutting off betweenovercoat 74 and upper slidingsleeve 721, upper slidingsleeve 721 is axial down sliding under the effect of hydraulic pressure, in the present invention, the lower end oflow sleeve 722 radially inwardly convexes withlocation division 7221, whenshear pin 7214 is cut off, and the upper end contact ofspool 736 is onlocation division 7221 time, thepressure break hole 741 ofovercoat 74 is connected just with the flowinghole 7211 of upper slidingsleeve 721, now, undergauge slidingsleeve 7 is opened, by in the centre bore 76 to undergauge slidingsleeve 7, adding sand, carry out fracturing work to treat the pressure break oil reservoir.

Undergauge slidingsleeve 7 of the present invention, when a plurality of oil reservoirs in down-hole are carried out to fracturing work, be connected a plurality of undergauge slidingsleeve 7 series connection, passes through to meetwater packer 6 packings between each undergauge sliding sleeve 7.By from well head, dropping into the identical ball of diameter, just can open in turn the undergauge slidingsleeve 7 of a plurality of oil layer sections, the unlatching of this undergauge slidingsleeve 7 is not subject to the restriction of pitching diameter, it has guaranteed the large latus rectum of fracturing string, and increased the transformation progression of oil reservoir, reduce operating risk, facilitated being lowered to smoothly of later stage instrument.

The pressurereduction sliding sleeve 4 be connected with a plurality ofpressure break structures 3 is pressure reduction sliding sleeve well known in the prior art, and its concrete structure does not repeat them here.Pressurereduction sliding sleeve 4 just can open and carry out the fracturing work of downhole oil layer under the effect of water injection pressure.

The roundend float shoe 8 that is connected to pressurereduction sliding sleeve 4 one ends is float shoe well known in the prior art, and its concrete structure does not repeat them here.The effect of this roundend float shoe 8 is mainly to guarantee that the safety of tubing string is lowered to and annular space carrying out smoothly for mud.

According to one embodiment of the invention, the inside wall of described connectingcylinder 731 is provided withlatch 7315, and the outside, lower end of describedbackstay 734 is connected withlock ring latch 7342, and describedlock ring latch 7342 matches with described latch 7315.Specifically,latch 7315 is opened on the inside wall of the second connectingcylinder 7313 of connectingcylinder 731, in the outside, lower end ofbackstay 734, is provided withgroove 7343, andlock ring latch 7342 is arranged in this groove 7343.Whenbackstay 734 axially moves down,lock ring latch 7342 can be stuck on thelatch 7315 of the second connectingcylinder 7313, can make like thisbackstay 734 in the process axially moved down, be locked at step by step on connectingcylinder 731, prevent onbackstay 734 axially that the situation of moving occurs.

The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, its Completion Operations is as follows: at first, after boring completion, bysurface pipe 51 andprotective casing 52 well cementing of cement, then well drilling pipe column and the fracturing integrated tubing string of open-hole horizontal well completion of the present invention are linked together, this tubing string is sent in open-holehorizontal well section 92, theextension hanger 2 on the fracturing integrated tubing string of open-hole horizontal well completion top is hung inprotective casing 52; Secondly, well head connects pumping line, and direct circulation is by the casing annulus drilling mud for clean, and then pitching builds the pressure, theextension hanger 2 of giving up; Afterwards, top rod is hung to sealing place dropout by tail pipe and take out, again change docking oil pipe 1 andinsert extension hanger 2, and guarantee this place's good seal; After 24 hours, it is complete thatchance water packer 6 is met the water automatic settings, packing oil jacket annular space; Now, to pump hydraulic pressure in tubing string, pressurereduction sliding sleeve 4 is opened under the effect of hydraulic pressure, and start to pressurereduction sliding sleeve 4 oil reservoir is carried out to fracturing work; Finally, by drop into theball 10 of same diameter from well head, open the right undergauge slidingsleeve 7 of each oil reservoir and carry out fracturing work.

The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, it is simple in structure, and it is convenient to install with constructing operation.Simultaneously, thischance water packer 6 is compared with the bore hole compression packer, has the safety of setting, and adapts to the characteristics of irregular borehole.The fracturing integrated tubing string of open-hole horizontal well completion adopts undergauge slidingsleeve 7 to realize each oil reservoir of down-hole is carried out to fracturing work, adopts theidentical ball 10 of diameter, opens the undergauge slidingsleeve 7 of a plurality of oil layer sections, increases the progression of oil formation improvement.The fracturing integrated tubing string of this open-hole horizontal well completion has shortened completion and pressure break time greatly, has reduced operating risk, has guaranteed the large latus rectum of tubing string, facilitates the operation that is lowered to of later stage instrument.

In addition, in one embodiment of this invention, the lower end of theextension hanger 2 of the fracturing integrated tubing string of this open-hole horizontal well completion also is connected with a packer, and this packer is formeeting water packer 6, and it can effectively stop the impact of inclination section water layer on nethorizontal section 92 each oil reservoirs.

According to an embodiment of the invention, the fracturing integrated tubing string of described open-hole horizontal well completion comprises three describedpressure break structures 3, thebackstay 734 of theundergauge sliding sleeve 7 of each describedpressure break structure 3 is provided with four described draw-ingrooves 7341, the upper end of the slidingcylinder 732 of the describedundergauge sliding sleeve 7 at close described horizontal well well head place is fastened in 734 4 draw-ingrooves 7341 of described backstay and is positioned at draw-ingroove 7341 bottom, the upper end of the slidingcylinder 732 of theundergauge sliding sleeve 7 of the describedpressure break structure 3 in the middle of being arranged in three describedpressure break structures 3 is fastened on 734 4 draw-ingrooves 7341 of described backstay and is positioned at the draw-ingroove 7341 of draw-ingroove 7341 tops bottom, the upper end of the slidingcylinder 732 of the describedundergauge sliding sleeve 7 at close described pressurereduction sliding sleeve 4 places is fastened in 734 4 draw-ingrooves 7341 of described backstay and is positioned at the draw-in groove of draw-in groove 7341 ' below topmost.

When in the fracturing integrated tubing string of open-hole horizontal well completion, dropping into first ball, at first undergauge sliding sleeve 7 near pressure reduction sliding sleeve 4 is unlocked, the flexible ball seat 724 of this undergauge sliding sleeve 7 radially moves inwardly into setting position, now drop into the second ball, the flowing hole 7211 of the upper sliding sleeve 721 of this undergauge sliding sleeve 7 is connected with pressure break hole 741, thereby carries out fracturing work; Drop into afterwards the 3rd ball, the undergauge sliding sleeve 7 of the pressure break structure 3 due to three pressure break structures 3 in the middle of being positioned at, in the process of front twice pitching, its flexible ball seat 724 is in setting position, the 3rd ball now dropped into, to the flowing hole 7211 of the upper sliding sleeve 721 of this undergauge sliding sleeve 7 be connected with pressure break hole 741, thereby carry out fracturing work; Finally, drop into the 4th ball, undergauge sliding sleeve 7 due to the pressure break structure 3 near the well head place, in the process of first three pitching, its flexible ball seat 724 is in setting position, the 4th ball now dropped into, will make the flowing hole 7211 of the upper sliding sleeve 721 of this undergauge sliding sleeve 7 be connected with pressure break hole 741, thereby carry out fracturing work.

The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various changes or modification and not break away from the spirit and scope of the present invention the embodiment of the present invention according to the disclosed content of application documents.

Claims (11)

1. the fracturing integrated tubing string of open-hole horizontal well completion, is characterized in that, the fracturing integrated tubing string of described open-hole horizontal well completion comprises:

The docking oil pipe, it is located in the sleeve pipe of Vertical Well section of horizontal well;

Extension hanger, it is connected with described docking oil pipe, and described extension hanger hangs on described sleeve pipe;

A plurality of pressure break structures, it is connected on described extension hanger and is positioned at the net horizontal section of described horizontal well, and each described pressure break structure series connection is connected, and it comprises chance water packer and the undergauge sliding sleeve be connected; Wherein, described undergauge sliding sleeve comprises:

Top connection, its upper end is connected with described chance water packer, and its lower end is connected with overcoat, and the lower end of described overcoat is connected with lower contact, and the upper end of described overcoat offers the pressure break hole;

Undergauge mechanism, it has and wears the upper sliding sleeve be connected in described overcoat, the upper end of described upper sliding sleeve offers flowing hole, its lower end is connected with low sleeve, wear and be connected with push rod in described upper sliding sleeve, between described push rod and described low sleeve, be folded with flexible ball seat, the lower end of described upper sliding sleeve offers inlet opening, be formed with admission chamber between described push rod and described upper sliding sleeve, described inlet opening is connected with described admission chamber;

Detent mechanism, it is positioned at the below of described undergauge mechanism, described detent mechanism has the connecting cylinder be located in described overcoat, be equipped with sliding cylinder and pedestal in described connecting cylinder, described sliding cylinder can axially movably be located in the upper end of described pedestal, the lower end of described pedestal is connected with described lower contact, be folded with backstay and piston between described pedestal and described connecting cylinder, the inboard, upper end of described backstay is axially arranged with a plurality of draw-in grooves, the upper end of described sliding cylinder is fastened in described draw-in groove, and described piston is connected on described connecting cylinder;

Wherein, described connecting cylinder with offer respectively the relative fluid hole of level and inlet opening on described pedestal, described piston is provided with radial direction through hole, in the upper end of described sliding cylinder, be fastened under the state of the described draw-in groove that is positioned at top in a plurality of described draw-in grooves, the inlet opening of described fluid hole, described radial direction through hole and described pedestal is connected;

The pressure reduction sliding sleeve, the one end is connected with described a plurality of pressure break structures by packer, and its other end is connected with float shoe.

2. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the upper end of the connecting cylinder of described undergauge sliding sleeve is connected with spool, and described low sleeve is set in the upper end of described spool slidably, and the lower end of described spool is located in described sliding cylinder.

3. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 2, it is characterized in that, described upper sliding sleeve is connected to described outer putting by shear pin, the lower end of described low sleeve radially inwardly convexes with location division, at described shear pin, cut off, and the upper end contact of described spool is under the state of described location division, and described pressure break hole is connected with described flowing hole.

4. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, described connecting cylinder comprises the first connecting cylinder and the second connecting cylinder, described the first connecting cylinder is connected to the upper end of described the second connecting cylinder, and described piston is connected on described the second connecting cylinder by shear pin.

5. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the upper end of described lower contact is connected with excessive head, and described excessive head is located in described overcoat, and the lower end of described pedestal, the lower end of described connecting cylinder are connected on described excessive head.

6. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, between described sliding cylinder and described pedestal, is folded with spring.

7. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, the upper end of described sliding cylinder radially outward convexes with snap fit, and described snap fit is fastened in described draw-in groove, and the lower end of described sliding cylinder radially inwardly convexes with sits the ball pawl.

8. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, described push rod is connected on described upper sliding sleeve by shear pin, be formed with container cavity between described upper sliding sleeve and described overcoat, be formed with annular chamber between described connecting cylinder and described overcoat, described container cavity is connected with described annular chamber, at described fluid hole, described radial direction through hole, the inlet opening of described pedestal, described annular chamber and described container cavity are connected, and under the state that described shear pin is cut off, the described flexible ball seat of described push rod pushing and pressing radially moves inwardly into the seat ball position.

9. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, the inside wall of described connecting cylinder is provided with latch, and the outside, lower end of described backstay is connected with the lock ring latch, and described lock ring latch matches with described latch.

10. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the fracturing integrated tubing string of described open-hole horizontal well completion comprises three described pressure break structures, the backstay of the undergauge sliding sleeve of each described pressure break structure is provided with four described draw-in grooves, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described horizontal well well head place is fastened in four draw-in grooves of described backstay and is positioned at draw-in groove bottom, the upper end of the sliding cylinder of the undergauge sliding sleeve of the described pressure break structure in the middle of being arranged in three described pressure break structures is fastened on four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove top bottom, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described pressure reduction sliding sleeve place is fastened in four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove below topmost.

11. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, between described extension hanger and described a plurality of pressure break structure, also is connected with packer, described packer is for meeting water packer.

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