CN201513162U - Multilayer-section fracturing device of releasing tubular column - Google Patents

Abstract

The utility model relates to a multilayer-section fracturing technology of an oil-gas field oil well, a gas well or a water injection well, in particular to a multilayer-section fracturing device of a releasing tubular column, which at least comprises a sliding sleeve seat, a sand blaster, a stage oil pipe, packers, a releasing joint and a transmission oil pipe, wherein the sand blaster is in screw connection with the sliding sleeve seat and is positioned on the sliding sleeve seat; the sand blaster is connected with the packer via the middle oil pipe to form a layer fracturing tubular column; and the front layer fracturing tubular column is connected with the packer of the rear layer fracturing tubular column via screw threads and is positioned on the front-stage packer, and the back-stage packer is connected with the releasing joint and then is connected with the transmission oil pipe via the releasing joint. The utility model implements the continuous fracturing operation of a plurality of oil and gas layer sections of slim holes and horizontal wells.

Description

The tubing string multi-section multi-layer fracturing device of giving up

Technical field

The utility model relates to the technology of the multi-section multi-layer pressure break of oil, gas field oil well, gas well or water injection well, is the tubing string multi-section multi-layer fracturing device of giving up exactly.

Background technology

The multi-section multi-layer fracturing technique mainly contains liquid gum plug pressure break, current limliting pressure break, throws nylon ball pressure break, jetting pressure break and machine tool pressure break etc. both at home and abroad.The liquid gum plug operation is more, and reservoir is had certain injury; Current limliting and throwing nylon ball pressure break require the interlayer sorting good, and it is wayward to construct; Jetting sand is than low, and water supply volume is big, and making the seam effect has to be evaluated.Isolate the multi-section multi-layer pressure break for machine tool, because the slim hole diameter is little, can only select undersized oil pipe, discharge capacity does not reach designing requirement, and pipeline frictional resistance is big, operation pressure is higher, if adopt light casing fracturing (the light sleeve pipe is meant does not have oil pipe in the pit shaft), and can only pressure break single or multiple lift combined pressure.For the pressure break of slim hole and horizontal well, downhole tool is bigger by the risk of sand card, and tubing string takes out relatively difficulty.(tubing string is a tool string, is the downhole tool combination that is cascaded with oil pipe)

Summary of the invention

The purpose of this utility model provides a kind of tubing string multi-section multi-layer fracturing device of giving up, so that realize the successive fracture treatment of slim hole and a plurality of oil gas intervals of horizontal well.

The technical solution of the utility model is that the tubing string multi-section multi-layer fracturing device of giving up comprises sleeve base, sandblaster, level oil pipe, packer, back-off sub, conveying oil pipe at least; Sandblaster is threaded with sleeve base, is located on the sleeve base; Sandblaster is connected to form one deck fracturing string by the oil pipe and the packer of centre; Back lamination splits the packer of tubing string and anterior layer fracturing string by being threaded, and is located on the prime packer, and back level packer connects back-off sub, is connected with the conveying oil pipe by back-off sub again.

Described fracturing string can be two-layer more than.

Described three laminations split tubing string and comprise sleeve base, first order sandblaster, first order oil pipe, first order packer, second level sandblaster, second level oil pipe, second level packer, third level sandblaster, third level oil pipe, third level packer, back-off sub, conveying oil pipe.First order sandblaster is threaded with nethermost sleeve base, is located on the sleeve base; First order sandblaster is connected to form one deck fracturing string by the first order oil pipe and the first order packer of centre; Second level sandblaster and first order packer are located on the first order packer by being threaded, and second level sandblaster is connected to form second level one deck fracturing string with second level packer after by second level oil pipe; And third level sandblaster and second level packer be located on the packer of the second level by being threaded, and third level sandblaster is connected to form third level one deck fracturing string with third level packer after by third level oil pipe.

Described four laminations split tubing string and comprise sleeve base, first order sandblaster, first order oil pipe, first order packer, second level sandblaster, second level oil pipe, second level packer, third level sandblaster, third level oil pipe, third level packer, back-off sub, conveying oil pipe at least.Increase fourth stage sandblaster, fourth stage oil pipe, fourth stage packer on the basis above-mentioned stating, first order sandblaster is threaded with nethermost sleeve base, is located on the sleeve base; First order sandblaster is connected to form one deck fracturing string by the first order oil pipe and the first order packer of centre.Second level sandblaster and first order packer are located on the first order packer by being threaded, and second level sandblaster is connected to form second level one deck fracturing string with second level packer after by second level oil pipe; And third level sandblaster and second level packer be located on the packer of the second level by being threaded, and third level sandblaster is connected to form third level one deck fracturing string with third level packer after by third level oil pipe.Be the 4th sandblaster at last with third level packer by being threaded, be located on the third level packer, the 4th sandblaster is connected to form fourth stage one deck fracturing string with fourth stage packer after by fourth stage oil pipe.

Technological principle of the present utility model is: carry the packer of respective number (to select from anchoring packer with oil pipe, otherwise also need hydraulic anchor) and tool string such as sandblaster, after arriving design attitude, from the pitching of well head oil pipe, ball drops down onto on the sliding sleeve of first order sandblaster, beat hydraulic pressure from the well head oil pipe, fluid power is with packer sealing and be anchored on the sleeve pipe, isolates each oil gas interval.Rising pressure, oil pipe and tool string are thrown off, and tool string is stayed the down-hole, take out and carry oil pipe, adopt light sleeve pipe infusion pressure break, and the pitching sandblaster that cover opens each interval from top to bottom successively that skids carries out fracturing work.

(sand is trapped in the sand export of crack mouth, perforation borehole or instrument owing to sand plug might take place multiple reason during sand fracturing, cause that follow-up sand can't continue to enter the crack, the fluid passage is blocked, cause system's moment superpressure), cause pressure break to be interrupted, the key of the tubing string multi-section multi-layer pressure break of therefore giving up is the prevention and the treatment technology of sand plug.

Characteristics of the present utility model are:

1, takes the lead in adopting releasing type multi-section multi-layer fracturing string structure, obtained the breakthrough of highly difficult well multi-section multi-layer pressure break isolation technologies such as slim hole and horizontal well.

2, the tubing string form of giving up belongs to the fixed tubular column structure, need not move well head handling tubing string during the conversion fractured interval, and following one-trip string is a plurality of intervals of pressure break continuously, the operating efficiency height.

3, adopt light sleeve pipe infusion pressure break, discharge capacity is big, frictional resistance is little, and operation pressure is lower, has improved the reliability of instrument.

Easy bit freezing when 4, the downhole tool of slim hole and fractured horizontal well trips out, releasing type multi-section multi-layer fracturing string construction finishing instrument does not take out, and has avoided the risk of bit freezing.

5, take the optimization of sand by perforating parameter, tool parameters, construction parameter and liquid, reduced the risk of sand plug.

If 6, sand plug takes place in conventional fracturing string, have a large amount of sand settings in the oil pipe, it is obstructed to circulate probably during sand washing, when giving up tubing string generation sand plug, is lowered to the sand washing tubing string separately, the pit shaft sand setting thoroughly can be gone out pit shaft, and sand washing is effective.

Description of drawings

Below in conjunction with the embodiment accompanying drawing the utility model is described further.

Fig. 1 is the example structure schematic diagram.

Among the figure: 1, sleeve base; 2, first order sandblaster; 3, first order oil pipe; 4, first order packer; 5, second level sandblaster; 6, second level oil pipe; 7, second level packer; 8, third level sandblaster; 9, third level oil pipe; 10, third level packer; 11, back-off sub; 12, carry oil pipe; 13, small ball; 14, middle steel ball; 15, big steel ball.

The specific embodiment

It is three layers of embodiment that carries out branch interval pressure break thatembodiment 1 provides fracturing string.

As shown in Figure 1, comprisesleeve base 1,first order sandblaster 2, firstorder oil pipe 3,first order packer 4,second level sandblaster 5, secondlevel oil pipe 6,second level packer 7, third level sandblaster 8, third level oil pipe 9,third level packer 10, back-offsub 11, conveying oil pipe 12.First order sandblaster 2 is threaded withnethermost sleeve base 1, is located on thesleeve base 1;First order sandblaster 2 is connected to form one deck fracturing string by the firstorder oil pipe 3 of centre with first order packer 4.Second level sandblaster 5 andfirst order packer 4 are located on thefirst order packer 4 by being threaded, andsecond level sandblaster 5 is connected to form second level one deck fracturing string by secondlevel oil pipe 6 backs withsecond level packer 7; And third level sandblaster 8 andsecond level packer 7 are located on thesecond level packer 7 by being threaded, and third level sandblaster 8 is connected to form third level one deck fracturing string by third level oil pipe 9 backs withthird level packer 10.

Three layers of separate stratum fracfturing tubing string are the hollow body, before each interval pressure break, the sand export of each sandblaster is all by the sliding sleeve shutoff, sliding sleeve is fixed in the sandblaster with shear pin, cut off shear pin, sliding sleeve is opened, and the liquid of tubing string inner chamber can enter the oil gas interval through the perforation borehole of sleeve pipe from the sand export of sandblaster, and three sandblasters are corresponding with the perforation borehole of three oil gas intervals.Sliding sleeve internal diameter from top to bottom is ascending, matches with corresponding steel ball.

The technological process that fracturing string carries out the multi-section multi-layer pressure break is:

1, the tool string of multi-section multi-layer fracturing string is delivered to down-hole (decide according at that time designing requirement concrete position) with oil pipe;

2, carry oil pipe to throw minimum steel ball from well head, drop on the sliding sleeve of first order sandblaster;

3, squeeze into hydraulic pressure in well head is carried oil pipe, small ball is blocked the fluid passage, has suppressed high pressure at the tubing string inner chamber, makes all packer sealings and is anchored on the inwall of sleeve pipe;

4, rising pressure, the shear pin of back-off sub is cut off, and following tool string is thrown off with carrying oil pipe, takes out and carries oil pipe, and tool string is stayed the down-hole;

5, suppress from the well head sleeve pipe then, suppress the sliding sleeve on the first order sandblaster, small ball and sliding sleeve are seated in the sleeve base;

6, liquid enters interval No. one from the sand export of first order sandblaster, an interval is pressed off a crack, sand filling crack;

7, an interval pressure break finishes;

8, the big middle steel ball of input ratio small ball diameter again, middle steel ball drops on the sliding sleeve of sandblaster inboard, the second level;

9, suppress from sleeve pipe, suppress the sliding sleeve on the sandblaster of the second level, middle steel ball and sliding sleeve are seated in the sleeve base of first order packer, passage below the shutoff;

10, liquid enters interval No. two from the sand export of second level sandblaster, No. two intervals is pressed off a crack, sand filling crack;

If 11 have more multi-layered section, according to step 810 other interval is carried out fracturing work again, thereby realized the successive fracture treatment of all intervals.

It is four layers embodiment thatembodiment 2 provides fracturing string.

The same withembodiment 1, comprisesleeve base 1,first order sandblaster 2, firstorder oil pipe 3,first order packer 4,second level sandblaster 5, secondlevel oil pipe 6,second level packer 7, third level sandblaster 8, third level oil pipe 9,third level packer 10, back-offsub 11 at least, carry oil pipe 12.Increase the 4th sandblaster, the 4th oil pipe, the 4th packer on the basis above-mentioned stating,first order sandblaster 2 is threaded withnethermost sleeve base 1, is located on thesleeve base 1;First order sandblaster 2 is connected to form one deck fracturing string by the firstorder oil pipe 3 of centre with first order packer 4.Second level sandblaster 5 andfirst order packer 4 are located on thefirst order packer 4 by being threaded, andsecond level sandblaster 5 is connected to form second level one deck fracturing string by secondlevel oil pipe 6 backs withsecond level packer 7; And third level sandblaster 8 andsecond level packer 7 are located on thesecond level packer 7 by being threaded, and third level sandblaster 8 is connected to form third level one deck fracturing string by third level oil pipe 9 backs with third level packer 10.Be fourth stage sandblaster at last with third level packer by being threaded, be located on the third level packer, fourth stage sandblaster is connected to form fourth stage one deck fracturing string with fourth stage packer after by fourth stage oil pipe.

Fracturing string is four layers of activities of carrying out describing among the suitable equallyembodiment 1 of technology of branch interval pressure break, does not do too much explanation at this.

The preventive action of sand plug:

1, optimization tool parameter comprises and strengthens the sand export size, cuts down internal channel step etc.;

2, optimum perforation parameter is for example taked the large aperture perforation, high density pattern perforation etc.;

3, optimize construction parameter, add sand polishing sealing etc. such as low sand ratio, big discharge capacity, prepad fluid;

4, maintain strict control over liquid quality, that guarantees liquid takes the grittiness energy.

The handling procedure of sand plug:

1 if sand plug takes place, open the well head open flow earlier, can spray the drifting tube and then continue pressure break;

If 2 can not spray the drifting tube, then descend the sand washing tubing string, carry out inverse circular sand washing adapter, the pit shaft sand setting is all gone out ground;

3, transfer tubing string and back-off sub to hanging, on carry deblocking, inverse circular sand washing adapter again, if can be towards the drifting tube, pitching sets again, continues pressure break;

If 4 still can not then take out tubing string towards the drifting tube, descend fracturing string to continue pressure break again.

Claims (4)

1. the tubing string multi-section multi-layer fracturing device of giving up is characterized in that: comprise sleeve base (1), sandblaster, level oil pipe, packer, back-off sub (11) at least, carry oil pipe (12); Sandblaster is threaded with sleeve base (1), is located on the sleeve base (1); Sandblaster is connected to form one deck fracturing string by the oil pipe and the packer of centre; Back lamination splits the packer of tubing string and anterior layer fracturing string by being threaded, and is located on the prime packer, and back level packer connects back-off sub (11), is connected with conveying oil pipe (12) by back-off sub (11) again.

2. the tubing string multi-section multi-layer fracturing device of giving up according to claim 1 is characterized in that: described fracturing string be two-layer more than.

3. the tubing string multi-section multi-layer fracturing device of giving up according to claim 1 is characterized in that: described fracturing string comprises sleeve base (1), first order sandblaster (2), first order oil pipe (3), first order packer (4), second level sandblaster (5), second level oil pipe (6), second level packer (7), third level sandblaster (8), third level oil pipe (9), third level packer (10), back-off sub (11), carries oil pipe (12); First order sandblaster (2) is threaded with nethermost sleeve base (1), is located on the sleeve base (1); First order sandblaster (2) is connected to form one deck fracturing string by middle first order oil pipe (3) and first order packer (4); Second level sandblaster (5) and first order packer (4) are by being threaded, be located on the first order packer (4), second level sandblaster (5) is connected to form second level one deck fracturing string by second level oil pipe (6) back with second level packer (7); And third level sandblaster (8) and second level packer (7) are by being threaded, be located on the second level packer (7), third level sandblaster (8) is connected to form third level one deck fracturing string by third level oil pipe (9) back with third level packer (10), and totally three laminations split tubing string.

4. the tubing string multi-section multi-layer fracturing device of giving up according to claim 1 is characterized in that: described fracturing string comprises sleeve base (1), first order sandblaster (2), first order oil pipe (3), first order packer (4), second level sandblaster (5), second level oil pipe (6), second level packer (7), third level sandblaster (8), third level oil pipe (9), third level packer (10), back-off sub (11) at least, carries oil pipe (12); Increase fourth stage sandblaster, fourth stage oil pipe, fourth stage packer on the basis of the above, first order sandblaster (2) is threaded with nethermost sleeve base (1), is located on the sleeve base (1); First order sandblaster (2) is connected to form one deck fracturing string by middle first order oil pipe (3) and first order packer (4); Second level sandblaster (5) and first order packer (4) are by being threaded, be located on the first order packer (4), second level sandblaster (5) is connected to form second level one deck fracturing string by second level oil pipe (6) back with second level packer (7); And third level sandblaster (8) and second level packer (7) are by being threaded, be located on the second level packer (7), third level sandblaster (8) is connected to form third level one deck fracturing string by third level oil pipe (9) back with third level packer (10); Be the 4th sandblaster at last with third level packer by being threaded, be located on the third level packer, the 4th sandblaster is connected to form fourth stage one deck fracturing string with fourth stage packer after by fourth stage oil pipe, totally four laminations split tubing string.

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