A kind of sleeve type hydraulic jeting device and the tubing string including deviceTechnical field
The invention belongs to oil-gas field development field of tool, and in particular to for a kind of sleeve type hydraulic jeting device and including dressThe tubing string put.
Background technology
In the drilling operation of oil field or other drilling wells, perforation is widest completion side in current oilfield exploitation procedureFormula.After the completion of the drilling well of a bite well, well cementation, it is shot through production string and cement sheath using perforator and penetrates to the depthkeeping of oil reservoir oneDegree, so as to establish the oil gas flow channel of pit shaft and ground interlayer.The quality of perforator directly influences perforation completion effect.
Since last century early sixties, sand jet perforator achieves very big development.It is especially poor in reservoirIn different small homogeneous reservoir, there is good jet fracturing effect using hydraulic ejector.But for reservoir stress difference compared withBig reservoir, in jet pressure break high stress interval, fracturing fluid easily enters low stress interval or enters laminate layer section.
The content of the invention
For it is above-mentioned the problem of, the present invention propose a kind of sleeve type hydraulic jeting device and the tubing string including device.DressPut and avoid in the high stress interval of the larger reservoir of pressure break stress difference, fracturing fluid easily enters low stress interval or enteredThe problem of entering laminate layer section, pressure break specific aim can be improved, improve fracturing yield increasing effect.It can realize that one-trip string enters well simultaneously, spraySand perforation annular fracturing multistage, improve the scale of conventional multistage hydraulic jetting fracturing.
According to an aspect of the invention, it is proposed that a kind of sleeve type hydraulic jeting device, it includes：
Body, nozzle is set in the side wall of body,
Lower contact,
There is one end to be fixedly connected with body and another for the packing units being arranged between body and lower contact, packing unitsThe central tube being fixedly connected with lower contact, and the packing element in the centrally disposed pipe outer wall of circulating type are held, in the side wall of central tubeOn be provided with intercommunicating pore, and
Slidingtype is arranged on the inner sliding sleeve on the inwall of body,
Wherein, inner sliding sleeve is configured in the opening position that can block nozzle and intercommunicating pore before perforation, and in perforationIt can move and expose nozzle and intercommunicating pore.
Before hydraulic jetting fracturing is carried out, inner sliding sleeve closure nozzle and intercommunicating pore, when carrying out hydraulic fracturing, inner sliding sleeve movesIt is dynamic to expose nozzle and intercommunicating pore.High-pressure fluid is converted into high-speed jet liquid injection sheath and stratum by nozzle, is sprayedFracturing work, while under the effect of nozzle chock pressure difference, high-pressure fluid enters the sky that central tube and packing element are formed by intercommunicating poreBetween in, packing element expansion is realized annular space between packing device and pipe sleeve.Thus, isolated location ensures the flowing side of fracturing fluidTo avoiding fracturing fluid from entering low stress interval or enter laminate layer section, improve fracturing yield increasing effect.And inner sliding sleeve seals simultaneouslyStifled nozzle and intercommunicating pore, simplify structure, facilitate operation.
In one embodiment, packing units also include the upper jacket and lower jacket for being arranged on packing element both ends, upper jacketUpper end circulating type is arranged on the lower end outer wall of body and is fixedly connected with body, and the lower end of upper jacket is provided with circumferential firstHolding tank, the upper end of lower jacket are provided with the second circumferential holding tank, and the lower end circulating type of lower jacket is arranged on the outer of lower contactOn wall.
In a preferred embodiment, packing element includes center section, from center section vertically to the upper of both ends extensionEnd part and end portion, the diameter of center section is more than the diameter of upper part and end portion, and upper part is withEnd part is separately positioned on the first holding tank and neutralized in the second holding tank.By this set, upper jacket and lower jacket serveThe upper part of packing element and the effect of end portion are compressed, when packing element insulates, prevents upper part and the end portion of packing elementProject radially outwardly, so as to avoid the failure during packing element packing, ensure that stability during packing element packing.
Preferably, the axial dimension of upper part and the axial dimension of end portion are identical, and with the axial direction of center sectionSize ratio is 1:1~1:3.By this set in expansion process packing element entirety stress equalization, so as to improve packing elementEffect is insulated, adds device resistance to overturning.
In one embodiment, intercommunicating pore is close in the upper end of packing element, and is configured to multiple and equal in the circumference of central tubeEven distribution.By this set, be advantageous to high-pressure fluid from intercommunicating pore enter by packing element and central, tubular into space, and makeWhole packing element circumference stress equalization is obtained, improves the packing effect of the annular space between packing element expansion packing device and sleeve pipe.
In one embodiment, the first connector is extended axially upward out by the upper part of packing element, packing element is firstIt is fixedly connected at connector with upper jacket, the second connector is extended axially downward out by the end portion of packing element, packing element isIt is fixedly connected at two connectors with lower jacket.Preferably, the first connector and the second connector are metalwork, and are vulcanized with packing elementTogether.It is connected by above-mentioned be provided with beneficial to packing element with upper jacket and lower jacket, during packing element expansion packing, in packing elementUnder drive, lower jacket moves up relative to central tube.
In one embodiment, the radially-inwardly prominent positioning for being used to position inner sliding sleeve is set on the inwall of lower contactPlatform.In inner sliding sleeve folding process, positioning table is used to accept inner sliding sleeve and for it axially position.And such a setting structure letterIt is single, it is easy to accomplish.
In one embodiment, the length of inner sliding sleeve be more than nozzle upper side wall and intercommunicating pore lower wall between away fromFrom.By this set, meet that inner sliding sleeve can block nozzle and intercommunicating pore simultaneously, simplify structure.
According to another aspect of the present invention, there is provided a kind of tubing string, it includes at least one above-mentioned device.
In one embodiment, tubing string includes two or more devices, and is from upstream on the direction in downstream and setsThe internal diameter of the inner sliding sleeve for the device put is sequentially reduced.In connecting tube string, close to the internal diameter of the inner sliding sleeve of the device of wellbore bottomIt is small, pitching injection pressure break is carried out in work progress step by step, realizes one-trip string pressure break multistage.
In the application, term " on " " under " using the real work direction of device as reference.
Compared with prior art, the present invention includes advantages below.By being provided with packing units in the lower section of nozzle, enteringDuring row hydraulic jetting fracturing, high-pressure fluid can enter the space of packing element and central tube, be radially expanded packing element so as to packing deviceAnnular space between sleeve pipe.Thus, pressure break specific aim is improved, avoids fracturing fluid from entering low stress interval or enters laminate layerSection, improves fracturing yield increasing effect.When setting two or more devices on a tubing string, can be carried out in work progressPressure break is sprayed step by step, realizes one-trip string pressure break multistage.Thus, operating efficiency is improved, reduces running cost.
Brief description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein：
Fig. 1 shows the sleeve type hydraulic jeting device according to the present invention.
Accompanying drawing is not drawn according to the ratio of reality.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Fig. 1 shows the sleeve type hydraulic jeting device 100 according to the present invention.As shown in figure 1, device 100 includes body1st, lower contact 10, inner sliding sleeve 3, and the packing units 20 being arranged between body 1 and lower contact 10.Wherein, in the side of body 1Nozzle 4 is set on wall.Packing units 20 have the packing element 7 on the outer wall of central tube 8 and the centrally disposed pipe 8 of circulating type.CenterOne end of pipe 8 is fixedly connected with body 1, and the other end is fixedly connected with lower contact 10.And set in the side wall of central tube 8It is equipped with intercommunicating pore 81.Before carrying out hydraulic fracturing, the inner sliding sleeve 3 being arranged on the inwall of body 1 blocks nozzle 4 and intercommunicating pore 81.When carrying out hydraulic fracturing, nozzle 4 and intercommunicating pore 81 are exposed in the movement of inner sliding sleeve 3.It is converted at a high speed by nozzle 4 in high-pressure fluidJet liquid injection sheath and stratum, while carrying out injection fracturing work, high-pressure fluid is entered by the He of packing element 7 by intercommunicating pore 81In the space 82 that central tube 8 is formed, and it is radially expanded packing element 7, so as between packing device 100 and sleeve pipe (not shown)Annular space.Pressure break specific aim is which thereby enhanced, avoids fracturing fluid from entering low stress interval or enters laminate layer section, improve pressure breakEffect of increasing production.
In one embodiment, packing units 20 also include the upper jacket 6 and lower jacket 9 for being arranged on the both ends of packing element 7.In glueDuring the packing of cylinder 7, upper jacket 6 and lower jacket 9 are used to prevent the both ends of packing element 7 from projecting radially outwardly.The upper end of upper jacket 6 and sheetBody 1 is fixedly connected, such as the upper end circulating type of upper jacket 6 is enclosed on the outer wall of body 1, and is connected through a screw thread and is twisted body 1Tightly on the inwall of upper jacket 6.The lower end circulating type of lower jacket 9 is arranged on the outer wall of lower contact 10.
In a preferred embodiment, packing element 7 includes center section 72, axially extending from center section 72 to both endsUpper part 71 and end portion 73.Preferably, in order to easily manufactured, the axle of the axial dimension of upper part 71 and end portion 73To equal sized, and with the axial dimension of center section 72 with than for 1:1~1:3.And the diameter of center section 72 is more than upper endPart 71 and the diameter of end portion 73.Correspondingly, the first circumferential holding tank 61 is set on the lower end inner wall of upper jacket 6.The second circumferential holding tank 91 is set on the upper end inwall of lower jacket 9.Wherein, the upper part 71 of packing element 7 is contained in firstIn holding tank 61.And the end portion 73 of packing element 7 is contained in the second holding tank 91.Thus, upper jacket 6 and lower jacket 9 playThe upper part 71 of packing element 7 and the effect of end portion 73 are compressed, prevents the upper part 71 and the footpath of end portion 73 of packing elementTo outstanding, so as to avoid the failure during packing element 7 insulates.Also, in fracturing process is sprayed, the centre of packing element 7The radial outward expansion of part 72, serve the effect of packing annular space.Pass through above-mentioned setting so that 7 overall uniform force of packing element, fromAnd packing effect is improved, add the job stability of device 100.
It should be noted that the axial dimension of upper part 71 and end portion 73 can also be unequal.
In one embodiment, the upper part 71 of packing element 7 extends axially upward out the first connector 11.By packing element 7End portion 73 extend axially downward out the second connector 12.Preferably, the first connector 11 and the second connector 12 are equalFor metalwork, and sulfided with packing element 7.So that packing element 7 is fixedly connected at the first connector 11 with upper jacket 6.Packing element 7 is fixedly connected at the second connector 12 with lower jacket 9.Upper jacket 6, packing element 7 and lower jacket 9 are connected by this connectionIt has been connected on together.During the expansion packing of packing element 7, the radial outward expansion of center section 72 of packing element 7, so as to drive lower jacket9 move up.Also, seal 13 is set between lower jacket 9 and lower contact 10, for realizing between sheath 9 and lower contact 10Sealing.Meanwhile this seal 13 in lower jacket 9 relative in the motion process of lower contact 10, play sealing function always.
Preferably, intercommunicating pore 81 is close in the upper end of packing element 7, is flowed downward for high-pressure fluid by intercommunicating pore 81, fromAnd it is that the pressure of packing element 7 is allowed to be radially expanded.It is further preferred that intercommunicating pore 81 is arranged to multiple, and in the circumferential equal of central tube 8Even distribution (not shown), so that uniform force, the raising expansion of packing element 7 insulate in the circumferential for the center section 72 of packing element 7The packing effect of annular space between device 100 and sleeve pipe.It is further preferred that intercommunicating pore 81 is configured to rectangle verticallyHole (not shown), its is simple in construction, easy to process.Be advantageous to highly pressurised liquid simultaneously into the space of packing element 7 and central tube 882。
It is provided for positioning the positioning table 19 of inner sliding sleeve 3 on the inwall of lower contact 10.Positioning table 19 is configured to be connect by downFirst 10 inwall radially-inwardly protrudes step-like.In the folding process of inner sliding sleeve 3, positioning table 19 is used to accept inner sliding sleeve 3 simultaneouslyAxially position for it.Such a setting structure is simple, it is easy to accomplish.
The length of inner sliding sleeve 3 is more than the distance between the upper side wall of nozzle 4 and the lower wall of intercommunicating pore 81, and passes through shearingPin 5 is fixed on the inwall of body 1.It is, before perforation, the length of inner sliding sleeve 3 enables its upper end to axially extend to sprayOn mouth 4, and its lower end can be axially extended under intercommunicating pore 81, for blocking nozzle 4 and intercommunicating pore 81.
With being provided with external screw thread (not shown) on the lower end outer wall of lower contact 10 on the upper end outer wall of body 1.Body 1 and lower contact 10 and the connection of other parts are facilitated by this set, and interchangeability is strong, also allows for dismantling.
Ball seat 31 is set on the inwall of inner sliding sleeve 3, for coordinating with ball sealer.Enter well in device 100 to spray to designBehind position, a ball sealer matched with ball seat 31 is put into, is suppressed, cut shear pin 5, inner sliding sleeve 3 moves down into positioningAt platform 19.In this way, nozzle 4 has been connected inside and outside device 100, high-pressure fluid by nozzle 4 be converted into high-speed jet injection sheath andStratum, injection fracturing work is carried out, meanwhile, the intercommunicating pore 81 of the upper end of central tube 8 has connected inner chamber and the central tube 8 of device 100The space 82 formed with packing element 7, under chock pressure difference effect before and after nozzle 4, the expansion packing annular space of packing element 7.
(not shown) can connect at least one device 100 in one-trip string.If one-trip string connect two orTwo devices 100, the interior latus rectum of the inner sliding sleeve 3 per covering device 100 is different, and the dress that the side for being from upstream to downstream is set upThe internal diameter for putting 100 inner sliding sleeve 3 is sequentially reduced.I.e. in connecting tube string, lean on into the inner sliding sleeve 3 of the device 100 of wellbore bottomInterior latus rectum is small, and then up the interior latus rectum of inner sliding sleeve 3 increases step by step step by step.Pitching injection pressure break is carried out during construction step by step, is realizedOne-trip string pressure break multistage.So as to improve the scale of multi-stage water power injection pressure break.Improve operating efficiency, reduce operation intoThis.
Although by reference to preferred embodiment, invention has been described, is not departing from the situation of the scope of the present inventionUnder, various improvement can be carried out to it and part therein can be replaced with equivalent.The invention is not limited in Wen ZhonggongThe specific embodiment opened, but all technical schemes including falling within the scope of the appended claims.