CN103061733A

CN103061733A - Sleeve valve type fracturing production-increasing tool

Info

Publication number: CN103061733A
Application number: CN2013100123825A
Authority: CN
Inventors: 祝效华; 张向宁; 刘清友
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2013-01-14
Filing date: 2013-01-14
Publication date: 2013-04-24
Anticipated expiration: 2033-01-14
Also published as: CN103061733B

Abstract

The invention relates to a sleeve valve type fracturing production-increasing tool which can be used in directional wells and horizontal wells and has efficacy of freeness of mutual fleeing of fluid during sealing with well walls and recyclability of tools. The technical scheme includes that an upper snap ring joint of a three-rubber-sleeve packer is connected with a mandrel through a thread, the upper snap ring joint and a snap ring fasten a rubber sleeve to prevent shedding and extruding, a fracturing ball valve is connected with the three-rubber-sleeve packer through a thread, a short ball paw sleeve is fixed with an upper connector through a ball seat shear pin and covers a spray hole and is fixed with an outer ball paw through a screw, a rectangular through groove is arranged around the outer ball paw, and the upper connector is in threaded connection with a lower connector. The sleeve valve type fracturing production-increasing tool is high in sealability, high in safety of the rubber sleeve packer, simple in structure manufacturing of the fracturing ball valve and reusable and is used in well completion of oil-gas wells.

Description

A kind of sleeving valve formula fracturing yield increasing instrument

Technical field

The present invention relates to the special downhole tool for conventional gas and oil, shale oil gas, fine and close oil gas, is a kind of sleeving valve formula fracturing yield increasing instrument that not only can be used for directional well but also can be used for horizontal well.

Background technology

In modern oil gas well completion technology, sleeving valve formula fracturing yield increasing instrument is widely used in horizontal well, the exploitation of directional well staged fracturing, reservoir reconstruction, the well cementation fracturing technique, but with the operation form of usual employing release portion tubing string weight pushing set packer and supporting instrument, premature setting (malfunction) may appear in being lowered to process, then must could continue to transfer by upper lifting pipe post deblocking such as premature setting, another kind then need be met oil or be met water, and expanding, it is slow to set speed.In addition, instrument in the past and pressure break ability often are confined to three sections, maximum tens sections (but tool design is complicated, and need to throw the ball of more than ten kind specifications).In the past volume increase instrument and operating type cost thereof are high, and efficient is low, and China need to make the block of massive hydraulic fracturing volume increase and usually has the features such as reservoir disperses, low abundance, hyposmosis, urgent need be that integrated cost is low but fracturing technique and instrument that operating efficiency is high.Operating efficiency, operation economy and the work capacity of existing volume increase instrument and operating type thereof obviously can't satisfy the extensive pressure break demand of the oil-gas reservoirs such as China's hyposmosis, low abundance and shale gas.

For the problem that sleeving valve formula fracturing yield increasing instrument in the massive hydraulic fracturing exists, designed a kind of efficient sleeving valve formula fracturing yield increasing instrument of avoiding mistake to set and can set simultaneously multilayer or super multilayer.This instrument adopts the hydraulic setting mode to avoid being lowered to mistake and sets; The form of structure of design can be thrown a ball and be set simultaneously multilayer; Locking clamp deadlock structure in the Tubing Packer has guaranteed that packing element can not bounce back after extruding, the sealing borehole wall avoids fluid to alter layer, guarantees the service behaviour of packer under larger pressure reduction; Except the widgets such as ball valve, the most of parts of instrument are all reusable.

Summary of the invention

The objective of the invention is :For solving the deficiencies in the prior art, the spy provides a kind of efficient sleeving valve formula fracturing yield increasing instrument of avoiding mistake to set and can set simultaneously multilayer or super multilayer.

For achieving the above object, the technical scheme that head it off of the present invention is taked is: a kind of sleeving valve formula fracturing yield increasing instrument, connected to form successively by three Tubing Packer, pressure break ball valve, single Tubing Packer, ball pawl ball valve, it is characterized in that: the clasp top connection of three Tubing Packer is threaded with axle, clasp top connection and clasp fasten the clasp packing element and prevent from coming off and extrude, spray-hole is fixed and hidden to the short ball pawl cover of pressure break ball valve by ball seat shear pin and upper binding head, fix by screw and ectosphere pawl, have rectangular through slot around the ectosphere pawl.

The ratchet of the lock ring top connection of single Tubing Packer and the ratchet of lock ring piston fix, and the rollback block of ball pawl ball valve passes through the endosphere pawl by rollback behind the groove, and endosphere pawl and pitching pallet are fixed by screw.

The present invention compared with prior art, the beneficial effect that has is: (1) can avoid being lowered to the mistake set; (2) form of structure of design can be thrown a ball and be set simultaneously multilayer; (3) the locking clamp deadlock structure in the Tubing Packer has guaranteed that packing element can not bounce back after extruding, and the sealing borehole wall avoids fluid to alter layer, guarantees the service behaviour of packer under larger pressure reduction; (4) except the widgets such as ball valve, the most of parts of instrument are all reusable.

Description of drawings

Fig. 1 is the structural representation of a kind of sleeving valve formula of the present invention fracturing yield increasing instrument;

Fig. 2 is the structural representation of the present invention's three Tubing Packer 1 and pressure break ball valve 15;

Fig. 3 is the structural representation of the single Tubing Packer 24 of the present invention and ball pawl ball valve 27;

Fig. 4 is the structural representation of pressure break ball valve 15A of the present invention part;

Fig. 5 is the structural representation of ball pawl ball valve 27B of the present invention part;

Fig. 6 is the three-dimensional structure schematic diagram of ectosphere pawl 21 of the present invention;

Fig. 7 is the three-dimensional structure schematic diagram of endosphere pawl 29 of the present invention;

Fig. 8 is the three-dimensional structure schematic diagram of pitching pallet 30 of the present invention.

Among the figure: 1. three Tubing Packer, 2. clasp top connection, 3. axle, 4. clasp packing element, 5. clasp, 6. sealing ring, 7. pressure guide hole, 8. lock ring piston, 9. locking clamp deadlock structure, 10. fixing pin, 11. the clasp piston, 12. extrusion rings, 13. locating snap rings, 14. shear pin, 15. pressure break ball valves, 16. upper binding heads, 17. the ball seat shear pin, 18. short ball pawl covers, 19. spray-holes, 20. screw, 21. ectosphere pawls, 22. pitchings, 23. lower union joint, 24. single Tubing Packer, 25. lock ring top connections, 26. single packing element, 27. ball pawl ball valves, 28. long ball pawl covers, 29. the endosphere pawl, 30. pitching pallets, 31. rollback blocks.

The specific embodiment

By Fig. 1, Fig. 2, shown in Figure 3, a kind of sleeving valve formula fracturing yield increasing instrument, clasp top connection 2 and the axle 3 of three Tubing Packer 1 are threaded connection, clasp top connection 2 and clasp 5 fasten clasp packing element 4 and prevent from coming off and extrude, lock ring piston 8 upper ends contact with clasp 5 lower ends, be fixedly connected with clasp piston 11 by up and down ratchet and the terminal fixing pin 10 of terminal ratchet with the stuck mechanism 9 of middle locking, clasp piston 11 and extrusion ring 12 fixedly packing element prevent that the packing element colloid from extruding, shear pin 14 is housed in order to deblocking packer on three Tubing Packer, the 1 end stop ring 13, pressure break ball valve 15 upper ends are connected with three Tubing Packer, 1 lower end by screw thread, the short ball pawl overlaps 18 upper ends by ball seat shear pin 17 and upper binding head 16 fixing and covering spray-holes 19, the centre is fixed by screw 20 and ectosphere pawl 21 upper ends, have rectangular through slot around the ectosphere pawl 21, upper binding head 16 ends are threaded with lower union joint 23 upper ends; Lock ring top connection 25 and the axle 3 of single Tubing Packer 24 are threaded connection, the middle ratchet of lock ring top connection 25 terminal ratchets and lock ring piston 8 fixes, fixing pin 10 is fixed, lock ring piston 8 and locating snap ring 13 fixing single packing elements 26, shear pin 14 is housed in order to deblocking packer on the end stop ring 13, ball pawl ball valve 27 upper ends are connected with single Tubing Packer 24 lower ends by screw thread, the long ball pawl overlaps 28 upper ends and fixes and hide spray-hole 19 by ball seat shear pin 17 and upper binding head 16 inwalls, endosphere pawl 29 places long ball pawl cover 28 and is stopped at rollback block 31, rollback block 31 is by rollback behind the groove, allow endosphere pawl 29 and pitching 22 pass through smoothly, have rectangular through slot and end and pitching pallet 30 around the endosphere pawl 29 fixing by screw 20, upper binding head 16 ends are threaded with lower union joint 23 upper ends.

Extremely shown in Figure 8 by Fig. 4, after three Tubing Packer 1 of sleeving valve formula fracturing yield increasing instrument are lowered into the purpose well depth with pressure break ball valve 15, the pressure of spraining in the tubing string, pass through pressure guide hole 7 behind the pressure rise, promote lock ring piston 8 and clasp piston 11 reverse motions, and then cut off fixing pin 10, lock ring piston 8 promotes clasp 5 extruding clasp packing elements 4, in like manner, clasp piston 11 pushes packing element simultaneously with extrusion ring 12, the up and down ratchet locking lock ring piston 8 of locking clamp deadlock structure 9 and the ratchet on the clasp piston 11 have guaranteed to keep swelling state can not bounce back after the packing element extruding; After three Tubing Packer 1 set, ground pitching 22 is lowered in the pressure break ball valve 15, cut off and open after ball seat shear pin 17 rear promotion ectosphere pawls are advanced into groove 21 times, ectosphere pawl 21 is fixing by screw 20 with short ball pawl cover 18, having rectangular through slot around the ectosphere pawl 21 can open under certain pressure and allow pitching 22 enter next stage, wait opening all spray-hole 19 rear hydraulic jetting fracturings, after having constructed, the upper lifting pipe post is cut off the shear pin 14 on the locating snap ring 13 on all three Tubing Packer 1, takes out down-hole string behind the packing element retraction; In like manner, after single Tubing Packer 24 is lowered into the purpose degree of depth with ball pawl ball valve 27, the pressure of spraining in the tubing string, pass through pressure guide hole 7 behind the pressure rise, after cutting off fixing pin 10, promote that lock ring piston 8 is descending to push single packing element 26 simultaneously with locating snap ring 13, lock ring top connection 25 has guaranteed to keep spreading can not bounce back after single packing element extruding with ratchet on the lock ring piston 8; After single Tubing Packer 24 sets, ground pitching 22 is lowered in the ball pawl ball valve 27, after cutting off ball seat shear pin 17, promote pitching pallet 30, endosphere pawl 29, long ball pawl cover 28, rollback block 31 is descending, rollback block 31 enters rollback behind the groove, promote pitching pallet 30 descending with endosphere pawl 29, endosphere pawl 29 opens relief pitching 22 and enters next stage and be stopped at the lower union joint step, wait opening all spray-hole 19 rear hydraulic jetting fracturings, after having constructed, the upper lifting pipe post is cut off the shear pin 14 on the locating snap ring 13 on all single Tubing Packer 24, takes out down-hole string behind the packing element retraction.Enter the well casing post in the most front and last two three Tubing Packer 1 of connection of each interval, the centre connects three pressure break ball valves 15, single Tubing Packer 24, a plurality of ball pawl ball valve 27, single Tubing

Packer

24,15, three single Tubing Packer 24 packings of three pressure break ball valves therebetween successively; In like manner so syndeton is until final stage, and every section only needs a pitching 22; Only need upper lifting pipe post taking-up instrument to get final product after pressure break is complete.

Claims

1. sleeving valve formula fracturing yield increasing instrument, by three Tubing Packer (1), pressure break ball valve (15), single Tubing Packer (24), ball pawl ball valve (27) connects to form successively, it is characterized in that: the clasp top connection (2) of three Tubing Packer (1) is threaded with axle (3), clasp top connection (2) and clasp (5) fasten clasp packing element (4) and prevent from coming off and extrude, the short ball pawl cover (18) of pressure break ball valve (15) is fixing and covering spray-hole (19) by ball seat shear pin (17) and upper binding head (16), fixing by screw (20) and ectosphere pawl (21), ectosphere pawl (21) has rectangular through slot all around.

2. sleeving valve formula fracturing yield increasing instrument according to claim 1, it is characterized in that: the ratchet of the lock ring top connection (25) of single Tubing Packer (24) and the ratchet of lock ring piston (8) fix, the rollback block (31) of ball pawl ball valve (27) is by rollback behind the groove, endosphere pawl (29) is passed through, and endosphere pawl (29) is fixing by screw (20) with pitching pallet (30).