CN103590800A - Multi-level pitch fracturing sliding sleeve capable of fishing ball seats - Google Patents
Multi-level pitch fracturing sliding sleeve capable of fishing ball seats Download PDFInfo
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- CN103590800A CN103590800A CN201310613926.3A CN201310613926A CN103590800A CN 103590800 A CN103590800 A CN 103590800A CN 201310613926 A CN201310613926 A CN 201310613926A CN 103590800 A CN103590800 A CN 103590800A
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- ball seat
- pawl
- sliding sleeve
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Abstract
The invention discloses a multi-level pitch fracturing sliding sleeve capable of fishing ball seats. The multi-level fracturing sliding sleeve capable of fishing the ball seats comprises connectors, elastic claws and an elastic claw pipe. The connectors comprise the upper connector and the lower connector. The upper connector is connected with the lower connector, and the upper end of the upper connector is provided with an upper locating groove, a lower locating groove and a side hole. The multi-level pitch fracturing sliding sleeve further comprises a sliding sleeve mechanism and a ball seat fishing mechanism. When the sliding sleeve mechanism and the ball seat fishing mechanism move downwards for opening the sliding sleeve, elastic claw gaps in the sliding sleeve mechanism correspond to the side hole, and the elastic claw pipe is communicated inside and outside. Self-locking elastic claws which are matched with a ball seat fishing mechanism inside an upper-level sliding sleeve and a ball seat fishing mechanism in a lower-level sliding sleeve to be used for fishing the ball seats are arranged at the two ends of the ball seat fishing mechanism respectively. By means of the multi-level fracturing sliding sleeve, the effect that the sliding sleeve on the lower portion can realize fracture acidizing operation through sequential opening of pitches can be guaranteed, multiple levels of sliding sleeve ball seats and balls can be fished out at a time through a continuous oil pipe after the fracture acidizing operation, and therefore a drift diameter as large as possible can be obtained inside the pipe.
Description
Technical field
The multistage pitching fracturing sliding bush that the invention discloses a kind of ball seat salvaged for the operation of oil-gas field fracturing acidizing treatment, belongs to oil-gas field downhole operation instrument.
Background technology
At present, in horizontal well bore hole staged fracturing Acidizing Technology, the widely used pitching sliding sleeve of institute is mainly opened and is formed pressure break passage by pitching, step by step construction from bottom to top.During construction, the unlatching ball of sliding sleeve is sitting on ball seat, and most of well sliding sleeve can normally be opened, and after having constructed, ball is returned and discharged ground by discharge opeing.For example, China Patent No. " 201010216524.6 " discloses a kind of drillable ball injection sliding sleeve that is applicable to horizontal well, open day is on November 10th, 2010, it comprises piecing devices and spring claw tube structure, it is characterized in that: described piecing devices consist of top connection and lower contact, top connection and lower contact, by being threaded, are provided with locating slot, lower locating slot and side opening in the inner circle of top connection upper end; Spring claw tube structure consists of spring claw tube, and spring claw tube is arranged in upper and lower joint, in the upper end of spring claw tube, is provided with bullet pawl, in the upper end that plays pawl, is provided with and plays pawl boss.For another example, the disclosed a kind of pitching sliding sleeve of China Patent No. " 201220389703.4 ", open day is on 03 20th, 2013.The top connection of this instrument, circulation shell, lower contact is threaded in turn and follow closely and fixed by anti-rotation, power transmission pipe is fixed on circulation outer casing inner wall by shear pin and seals up the opening on circulation shell, ball seat is threaded on the inwall of power transmission pipe lower end, ball seat adopts and can bore material and make, and inverted-proof ring is arranged on the lower end step of power transmission pipe and locks by inverted-proof ring interstage sleeve.
But also there is following deficiency in pitching sliding sleeve of the prior art: if gas output is less, and oil well particularly, ball is not easy to return and ejects, thereby affects construction effect.In order to ensure completion tubular column effectively unimpeded in the effect after construction and well, also need if desired to bore grinder tool by coiled tubing band the ball not returning out in tubing string and the relatively little ball seat of latus rectum are bored to mill operation, to obtain larger latus rectum, but can not salvage sliding sleeve tee after operation, be unfavorable for the lifting of Oil/gas Well output, later stage operation is also inconvenient.
Summary of the invention
The object of the invention is to overcome existing pitching sliding sleeve above shortcomings, a kind of multistage pitching fracturing sliding bush of salvaging ball seat is provided, the present invention can guarantee that bottom sliding sleeve opened successively and realized fracture acidizing operation by pitching, again can be by disposable multistage sliding sleeve tee and the ball salvaged of coiled tubing after operation, make to manage the interior acquisition large latus rectum of trying one's best.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of multistage pitching fracturing sliding bush of salvaging ball seat, comprise joint, play pawl and spring claw tube, joint comprises top connection and lower contact, top connection is connected with lower contact, top connection upper end is provided with locating slot, lower locating slot and side opening, it is characterized in that: also comprise slider mechanism and salvage ball seat mechanism, when described slider mechanism and salvaging ball seat mechanism move downward for open sliding sleeve, bullet pawl gap in slider mechanism is corresponding with side opening, inside and outside pipe, gangs up; Described salvaging ball seat mechanism two ends are respectively arranged with salvaging ball seat mechanism and the salvaging ball seat mechanism in next stage sliding sleeve in upper level sliding sleeve and coordinate for salvaging the self-locking bullet pawl of ball seat.
Described slider mechanism comprises switch sleeve and the load cover being arranged in joint, switch sleeve is fixedly connected with load cover, switch sleeve upper end is provided with the first bullet pawl, load cover is connected with joint by sliding sleeve shear pin, when the bullet pawl boss on the first bullet pawl moves to lower locating slot from upper locating slot, the bullet pawl gap of the first bullet pawl is corresponding with side opening, inside and outside pipe, gangs up.
Described salvaging ball seat mechanism comprises that playing pawl stops lock tube, connect inner sleeve, spring claw tube, salvage shear pin, ball seat, salvage and play pawl head, playing pawl stops lock tube and is connected inner sleeve connection, bullet pawl stops lock tube upper end and is provided with the second bullet pawl, spring claw tube is between load cover and connection inner sleeve, spring claw tube is by salvaging shear pin and being connected inner sleeve and connecting, spring claw tube upper end is provided with the 3rd and plays pawl, the 3rd plays in the spacing locating slot putting at load of pawl, spring claw tube lower end plays pawl head with salvaging and is connected, salvaging bullet pawl head is connected with ball seat, salvage bullet pawl head lower end and be provided with the 4th bullet pawl, second plays pawl coordinates self-locking with the 4th bullet pawl of the salvaging bullet pawl head lower end of upper level sliding sleeve, the 4th plays pawl coordinates self-locking with the second bullet pawl that the bullet pawl of next stage sliding sleeve stops lock tube upper end.
Described switch sleeve and load cover are threaded connection, and connection of thread is provided with sealing ring, and is formed with locating slot after being threaded, and the 3rd bullet pawl is spacing in locating slot.
Described top connection upper end is connected with top pipe string, and top connection lower end and lower contact upper end are threaded connection, and fix by hold-down screw, and lower contact lower end is connected with bottom pipe string.
On the outer wall of described switch sleeve, be provided with the sealing ring coordinating with top connection inwall.
On described load cover outer wall, be provided with keyway, in keyway, be provided with the anti-turn screw coordinating with joint.
Described connection inner sleeve lower end and ball seat upper end are slidably matched, and the place of being slidably matched is provided with sealing ring sealing.
Described bullet pawl stops and on lock tube outer wall, is provided with the sealing ring coordinating with switch sleeve inwall, plays pawl and stops and on lock tube inwall, be provided with and be connected the sealing ring that outer wall of inside race coordinates.
Described bullet pawl stops lock tube and is connected inner sleeve and is threaded connection, and spring claw tube lower end plays pawl head thread and is connected with salvaging, and salvages bullet pawl head and is threaded with ball seat.
Employing the invention has the advantages that:
One, the present invention also comprises slider mechanism and salvages ball seat mechanism, and when described slider mechanism and salvaging ball seat mechanism move downward for open sliding sleeve, the bullet pawl gap in slider mechanism is corresponding with side opening, inside and outside pipe, gangs up; Described salvaging ball seat mechanism two ends are respectively arranged with salvaging ball seat mechanism and the salvaging ball seat mechanism in next stage sliding sleeve in upper level sliding sleeve and coordinate for salvaging the self-locking bullet pawl of ball seat, adopt this structure, can guarantee that bottom sliding sleeve opened successively and realized fracture acidizing operation by pitching, again can be by disposable multistage sliding sleeve tee and the ball salvaged of coiled tubing after operation, make to manage the interior acquisition large latus rectum of trying one's best, be beneficial to the convenience of lifting and the later stage operation of Oil/gas Well output.
Two, in the present invention, described slider mechanism comprises switch sleeve and the load cover being arranged in joint, switch sleeve is fixedly connected with load cover, switch sleeve upper end is provided with the first bullet pawl, load cover is connected with joint by sliding sleeve shear pin, when the bullet pawl boss on the first bullet pawl moves to lower locating slot from upper locating slot, the bullet pawl gap of the first bullet pawl is corresponding with side opening, inside and outside pipe, gang up, adopt this structure, when slider mechanism moves downward, can drive salvaging ball seat mechanism to move simultaneously, and by switch sleeve and first, play the structure of pawl, than play the structure of pawl by spring claw tube and first, more reliable when open sliding sleeve, and switch sleeve and load cover and salvaging ball seat mechanism to be connected matching relationship tightr.
Three, in the present invention, described salvaging ball seat mechanism comprises that playing pawl stops lock tube, connect inner sleeve, spring claw tube, salvage shear pin, ball seat, salvage and play pawl head, playing pawl stops lock tube and is connected inner sleeve connection, bullet pawl stops lock tube upper end and is provided with the second bullet pawl, spring claw tube is between load cover and connection inner sleeve, spring claw tube is by salvaging shear pin and being connected inner sleeve and connecting, spring claw tube upper end is provided with the 3rd and plays pawl, the 3rd plays in the spacing locating slot putting at load of pawl, spring claw tube lower end plays pawl head with salvaging and is connected, salvaging bullet pawl head is connected with ball seat, salvage bullet pawl head lower end and be provided with the 4th bullet pawl, second plays pawl coordinates self-locking with the 4th bullet pawl of the salvaging bullet pawl head lower end of upper level sliding sleeve, the 4th plays pawl coordinates self-locking with the second bullet pawl that the bullet pawl of next stage sliding sleeve stops lock tube upper end, adopt this structure, finally can realize the salvaging that a time running string can complete multistage sliding sleeve, whether and salvaging can be successful by coiled tubing tension variations judgement salvaging in ball seat process.
Four, in the present invention, described switch sleeve and load cover are threaded connection, connection of thread is provided with sealing ring, and after being threaded, be formed with locating slot, the 3rd bullet pawl is spacing in locating slot, and adopting is threaded has not only guaranteed with sealing ring the reliability that is connected and seals, and is convenient to connect and dismounting, after being threaded, be formed with locating slot, make the 3rd bullet pawl spacing more accurate.
Five, in the present invention, described top connection upper end is connected with top pipe string, top connection lower end and lower contact upper end are threaded connection, and fix by hold-down screw, lower contact lower end is connected with bottom pipe string, it is reliable that this structure connects upper and lower joint, connects respectively with upper, lower tube series winding, realized the salvaging of multistage sliding sleeve.
Six, in the present invention, on the outer wall of described switch sleeve, be provided with the sealing ring coordinating with top connection inwall, guaranteed the sealing reliability of switch sleeve and top connection.
Seven, in the present invention, on described load cover outer wall, be provided with keyway, be provided with the anti-turn screw coordinating with joint in keyway, this structure prevents from making relatively rotating of load cover and joint.
Eight, in the present invention, described connection inner sleeve lower end and ball seat upper end are slidably matched, and the place of being slidably matched is provided with sealing ring sealing, make to connect inner sleeve lower end with sliding mutually in ball seat upper end, and the sealing while having guaranteed again mutual slip by sealing ring.
Nine, in the present invention, described bullet pawl stops and on lock tube outer wall, is provided with the sealing ring coordinating with switch sleeve inwall, guarantee to play pawl and stopped the sealing reliability between lock tube and switch sleeve, play pawl and stop the sealing ring that is provided with and is connected outer wall of inside race cooperation on lock tube inwall, guaranteed that bullet pawl stops lock tube and the sealing reliability that is connected inner sleeve.
Ten, in the present invention, described bullet pawl stops lock tube and is connected inner sleeve and is threaded connection, and spring claw tube lower end plays pawl head thread and is connected with salvaging, and salvages bullet pawl head and is threaded with ball seat, and this structure has guaranteed the detachability of each parts.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
In figure, be labeled as: 1, top connection, 2, sealing ring, 3, switch sleeve, 4, play pawl and stop lock tube, 5, connect inner sleeve, 6, load cover, 7, sliding sleeve shear pin, 8, spring claw tube, 9, salvage shear pin, 10, anti-turn screw, 11, ball seat, 12, hold-down screw, 13, salvage to play pawl head, 14, lower contact, 15, open ball, 16, side opening, 17, first plays pawl, 18, second play pawl, the 19, the 3rd plays pawl, and the 20, the 4th plays pawl.
The specific embodiment
Embodiment 1
A kind of multistage pitching fracturing sliding bush of salvaging ball seat, comprise joint, play pawl and spring claw tube, joint comprises top connection 1 and lower contact 14, top connection 1 is connected with lower contact 14, top connection 1 upper end is provided with locating slot, lower locating slot and side opening 16, and it also comprises slider mechanism and salvages ball seat mechanism, when described slider mechanism and salvaging ball seat mechanism move downward for open sliding sleeve, bullet pawl gap in slider mechanism is corresponding with side opening 16, inside and outside pipe, gangs up; Described salvaging ball seat mechanism two ends are respectively arranged with salvaging ball seat mechanism and the salvaging ball seat mechanism in next stage sliding sleeve in upper level sliding sleeve and coordinate for salvaging the self-locking bullet pawl of ball seat.
In the present embodiment, described slider mechanism comprises switch sleeve 3 and the load cover 6 being arranged in joint, switch sleeve 3 is fixedly connected with load cover 6, switch sleeve 3 upper ends are provided with the first bullet pawl 17, load cover 6 is connected with joint by sliding sleeve shear pin 7, when the bullet pawl boss on the first bullet pawl 17 moves to lower locating slot from upper locating slot, the bullet pawl gap of the first bullet pawl 17 is corresponding with side opening 16, inside and outside pipe, gangs up.
In the present embodiment, described salvaging ball seat mechanism comprises that playing pawl stops lock tube 4, connect inner sleeve 5, spring claw tube 8, salvage shear pin 9, ball seat 11, salvage and play pawl head 13, playing pawl stops lock tube 4 and is connected inner sleeve 5 connections, bullet pawl stops lock tube 4 upper ends and is provided with the second bullet pawl 18, spring claw tube 8 is between load cover 3 and connection inner sleeve 5, spring claw tube 8 is by salvaging shear pin 9 and being connected inner sleeve 5 connections, spring claw tube 8 upper ends are provided with the 3rd and play pawl 19, the 3rd plays in the spacing locating slot on load cover 6 of pawl 19, spring claw tube 8 lower ends play pawl head 13 with salvaging and are connected, salvaging bullet pawl head 13 is connected with ball seat 11, salvage bullet pawl head 13 lower ends and be provided with the 4th bullet pawl 20, second plays pawl 18 coordinates self-locking with the 4th bullet pawl of the salvaging bullet pawl head lower end of upper level sliding sleeve, the 4th plays pawl 20 coordinates self-locking with the second bullet pawl that the bullet pawl of next stage sliding sleeve stops lock tube upper end.
In the present embodiment, described switch sleeve 3 and load cover 6 are threaded connection, and connection of thread is provided with sealing ring, and is formed with locating slot after being threaded, and the 3rd bullet pawl 19 is spacing in locating slot.
In the present embodiment, described top connection 1 upper end is connected with top pipe string, and top connection 1 lower end and lower contact 14 upper ends are threaded connection, and fix by hold-down screw, and lower contact 14 lower ends are connected with bottom pipe string.
In the present embodiment, on the outer wall of described switch sleeve 3, be provided with the sealing ring coordinating with top connection 1 inwall.
In the present embodiment, described load overlaps on 6 outer walls and is provided with keyway, is provided with the anti-turn screw 10 coordinating with joint in keyway.
In the present embodiment, described connection inner sleeve 5 lower ends and ball seat 11 upper ends are slidably matched, and the place of being slidably matched is provided with sealing ring sealing.
In the present embodiment, described bullet pawl stops and on lock tube 4 outer walls, is provided with the sealing ring coordinating with switch sleeve 3 inwalls, plays pawl and stops and on lock tube 4 inwalls, be provided with and be connected the sealing ring that inner sleeve 5 outer walls coordinate.
In the present embodiment, described bullet pawl stops lock tube 4 and is connected inner sleeve 5 and is threaded connection, and spring claw tube 8 lower ends play pawl head 13 and are threaded with salvaging, and salvages to play pawl head 13 and be threaded with ball seat 11.
Embodiment 2
The present embodiment is by reference to the accompanying drawings to describing.As shown in Figure 1, the present invention is by joint, slider mechanism with can salvage ball seat mechanism and form.
Joint comprises top connection 1 and lower contact 14, and the upper end of top connection 1 lower end and lower contact 14 is threaded connection, and for fixing needs, is provided with hold-down screw 12, and top connection 1 upper end is connected with top pipe string, and lower contact 14 lower ends are connected with bottom pipe string.
Slider mechanism comprises sealing ring 2, switch sleeve 3, load cover 6, sliding sleeve shear pin 7, anti-turn screw 10, switch sleeve 3 and load cover 6 are threaded connection, for the needs of anti-rotation, be provided with anti-turn screw 10 and slide in the keyway of load cover 6, switch sleeve 3 upper ends are provided with the first bullet pawl 17.
Can salvage ball seat mechanism and comprise and play that pawl stops lock tube 4, connects inner sleeve 5, spring claw tube 8, salvage shear pin 9, ball seat 11, salvage and play pawl head 13, play pawl and stop lock tube 4 and be connected inner sleeve 5 and be threaded connection; Spring claw tube 8 upper ends are provided with the 3rd and play pawl 19, and spring claw tube 8 lower ends are threaded connection with salvaging bullet pawl head 13 and ball seat 11, and connecting inner sleeve 5 lower ends and ball seat 11 upper ends can slide mutually, have sealing ring sealing.Playing pawl, to stop lock tube 4 upper ends be the second bullet pawl 18, and salvaging and playing pawl head 13 lower ends is the 4th to play pawl 20, and can be in actual use insert and realize self-locking and be connected with upper and lower level sliding sleeve respectively.
When site operation is used, can salvage ball seat pitching sliding sleeve and by design of string pipe requirement, be lowered into design attitude together with other downhole tool, in the time of need to opening sliding sleeve, drop into and open ball 15, open ball 15 and be sitting in ball seat 11 tops, in pipe, build the pressure, sliding sleeve shear pin 7 is cut off, slider mechanism with can salvage ball seat mechanism integral body and move down, bullet pawl boss locating slot from top connection 1 that switch sleeve 3 tops first play pawl moves to lower locating slot, be stuck in lower locating slot, the bullet pawl gap of the first bullet pawl 17 is corresponding with the side opening 16 in top connection 1, inside and outside pipe, gang up, sliding sleeve is opened complete, can carry out separate stratum fracfturing acidizing treatment.
After each layer of construction finishes, can unlatching balls 15 at different levels be returned and drain into well head and reclaim by the row's of returning mode, if can not the row of returning or do not carry out flowback procedure, also can directly carry out sliding sleeve fishing.
While salvaging ball seat, by connecting successively from top to bottom to salvage, play pawl head 13, centralizer, give up, coiled tubing, be lowered to coiled tubing to well inner sliding sleeve position, press down tubing string, make to salvage the 4th bullet pawl 20 of bullet pawl head 13 lower ends and stop the second bullet pawl also self-locking of embedding mutually of lock tube 4 upper ends with the bullet pawl in next stage sliding sleeve, then on, carry coiled tubing, cut off and salvage shear pin 9, by suspending weight, change and can judge that salvaging shear pin 9 has cut off, can salvage ball seat mechanism holds, now the 3rd of spring claw tube 8 upper ends the bullet pawl 19 has inside contracted withdrawal, lost efficacy with the sealing that is connected inner sleeve 5 in ball seat 11 tops.No matter open ball 15 whether still on ball seat 11, the upper and lower fluid passage of sliding sleeve is all communicated with, and fishing tool tubing string can continue to carry out direct circulation.Now as without salvaging subordinate's sliding sleeve tee, can directly trip out coiled tubing, as need, salvage subordinate's ball seat and can continue to be lowered to coiled tubing, can salvage ball seat mechanism by integral body by slider mechanism endoporus and arrive next stage sliding sleeve position, owing to can salvaging ball seat mechanism lower end, for salvaging, play pawl head 13, and now manage inner cycle channel and can carry out normal flush cycle, so can repeat above fishing process to next stage sliding sleeve, finally realize the salvaging that a time running string can complete multistage sliding sleeve.
Claims (10)
1. the multistage pitching fracturing sliding bush that can salvage ball seat, comprise joint, play pawl and spring claw tube, joint comprises top connection (1) and lower contact (14), top connection (1) is connected with lower contact (14), top connection (1) upper end is provided with locating slot, lower locating slot and side opening (16), it is characterized in that: also comprise slider mechanism and salvage ball seat mechanism, when described slider mechanism and salvaging ball seat mechanism move downward for open sliding sleeve, bullet pawl gap in slider mechanism is corresponding with side opening (16), inside and outside pipe, gangs up; Described salvaging ball seat mechanism two ends are respectively arranged with salvaging ball seat mechanism and the salvaging ball seat mechanism in next stage sliding sleeve in upper level sliding sleeve and coordinate for salvaging the self-locking bullet pawl of ball seat.
2. the multistage pitching fracturing sliding bush of salvaging ball seat according to claim 1, it is characterized in that: described slider mechanism comprises switch sleeve (3) and the load cover (6) being arranged in joint, switch sleeve (3) is fixedly connected with load cover (6), switch sleeve (3) upper end is provided with the first bullet pawl (17), load cover (6) is connected with joint by sliding sleeve shear pin (7), when the bullet pawl boss on the first bullet pawl (17) moves to lower locating slot from upper locating slot, the bullet pawl gap of the first bullet pawl (17) is corresponding with side opening (16), inside and outside pipe, gangs up.
3. the multistage pitching fracturing sliding bush of salvaging ball seat according to claim 2, it is characterized in that: described salvaging ball seat mechanism comprises that playing pawl stops lock tube (4), connect inner sleeve (5), spring claw tube (8), salvage shear pin (9), ball seat (11), salvage and play pawl head (13), playing pawl stops lock tube (4) and is connected inner sleeve (5) connection, bullet pawl stops lock tube (4) upper end and is provided with the second bullet pawl (18), spring claw tube (8) is positioned at load cover (3) and connects between inner sleeve (5), spring claw tube (8) is by salvaging shear pin (9) and being connected inner sleeve (5) connection, spring claw tube (8) upper end is provided with the 3rd and plays pawl (19), the 3rd plays in the spacing locating slot on load cover (6) of pawl (19), spring claw tube (8) lower end plays pawl head (13) with salvaging and is connected, salvaging bullet pawl head (13) is connected with ball seat (11), salvage bullet pawl head (13) lower end and be provided with the 4th bullet pawl (20), second plays pawl (18) coordinates self-locking with the 4th bullet pawl of the salvaging bullet pawl head lower end of upper level sliding sleeve, the 4th plays pawl (20) coordinates self-locking with the second bullet pawl that the bullet pawl of next stage sliding sleeve stops lock tube upper end.
4. the multistage pitching fracturing sliding bush of salvaging ball seat according to claim 3, it is characterized in that: described switch sleeve (3) and load cover (6) are threaded connection, connection of thread is provided with sealing ring, and after being threaded, be formed with locating slot, the 3rd bullet pawl (19) is spacing in locating slot.
5. according to the multistage pitching fracturing sliding bush of the ball seat salvaged described in claim 1,2,3 or 4, it is characterized in that: described top connection (1) upper end is connected with top pipe string, top connection (1) lower end and lower contact (14) upper end are threaded connection, and by hold-down screw, fix, lower contact (14) lower end is connected with bottom pipe string.
6. according to the multistage pitching fracturing sliding bush of the ball seat salvaged described in claim 2,3 or 4, it is characterized in that: on the outer wall of described switch sleeve (3), be provided with the sealing ring coordinating with top connection (1) inwall.
7. according to the multistage pitching fracturing sliding bush of the ball seat salvaged described in claim 2,3 or 4, it is characterized in that: on described load cover (6) outer wall, be provided with keyway, in keyway, be provided with the anti-turn screw (10) coordinating with joint.
8. according to the multistage pitching fracturing sliding bush of the ball seat salvaged described in claim 3 or 4, it is characterized in that: described connection inner sleeve (5) lower end and ball seat (11) upper end are slidably matched, the place of being slidably matched is provided with sealing ring sealing.
9. according to the multistage pitching fracturing sliding bush of the ball seat salvaged described in claim 3 or 4, it is characterized in that: described bullet pawl stops and on lock tube (4) outer wall, is provided with the sealing ring coordinating with switch sleeve (3) inwall, play pawl and stop and on lock tube (4) inwall, be provided with and be connected the sealing ring that inner sleeve (5) outer wall coordinates.
10. according to the multistage pitching fracturing sliding bush of the ball seat salvaged described in claim 3 or 4, it is characterized in that: described bullet pawl stops lock tube (4) and is connected inner sleeve (5) and is threaded connection, spring claw tube (8) lower end is threaded with salvaging bullet pawl head (13), salvages bullet pawl head (13) and is threaded with ball seat (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310613926.3A CN103590800B (en) | 2013-11-28 | 2013-11-28 | The multistage pitching fracturing sliding bush of ball seat can be salvaged |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310613926.3A CN103590800B (en) | 2013-11-28 | 2013-11-28 | The multistage pitching fracturing sliding bush of ball seat can be salvaged |
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| CN103590800A true CN103590800A (en) | 2014-02-19 |
| CN103590800B CN103590800B (en) | 2016-03-16 |
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| CN104790909A (en) * | 2015-04-09 | 2015-07-22 | 中国石油集团西部钻探工程有限公司 | Pitching sliding sleeve with ball seat capable of being taken |
| CN106545308A (en) * | 2015-09-23 | 2017-03-29 | 中国石油化工股份有限公司 | The method salvaged pipe string and salvage the ball seat of spherically seated sliding sleeve using which |
| CN108240197A (en) * | 2017-12-27 | 2018-07-03 | 中国石油集团长城钻探工程有限公司 | The pitching sliding sleeve of ball seat can be salvaged |
| CN110145292A (en) * | 2019-05-18 | 2019-08-20 | 中国石油天然气股份有限公司 | A kind of elastic lock sleeve sanding machine |
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| US10494901B2 (en) | 2015-04-09 | 2019-12-03 | Cnpc Xibu Drilling Engineering Company Limited | Ball-dropping sliding sleeve with a removable ball seat |
| CN106545308A (en) * | 2015-09-23 | 2017-03-29 | 中国石油化工股份有限公司 | The method salvaged pipe string and salvage the ball seat of spherically seated sliding sleeve using which |
| CN108240197A (en) * | 2017-12-27 | 2018-07-03 | 中国石油集团长城钻探工程有限公司 | The pitching sliding sleeve of ball seat can be salvaged |
| CN110145292A (en) * | 2019-05-18 | 2019-08-20 | 中国石油天然气股份有限公司 | A kind of elastic lock sleeve sanding machine |
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| CN103590800B (en) | 2016-03-16 |
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