CN117888833B

CN117888833B - Anticreep sleeve centralizer

Info

Publication number: CN117888833B
Application number: CN202410291281.4A
Authority: CN
Inventors: 马国耀; 魏钊; 于永波; 顾倍肇; 赵爱杰; 刘俊卿
Original assignee: CHANGSHU PETROLEUM CEMENTING TOOL CO LTD
Current assignee: CHANGSHU PETROLEUM CEMENTING TOOL CO LTD
Priority date: 2024-03-14
Filing date: 2024-03-14
Publication date: 2024-06-25
Anticipated expiration: 2044-03-14
Also published as: CN117888833A

Abstract

The invention relates to the technical field of centralizers, in particular to an anti-drop sleeve centralizer, which comprises a pipe body, wherein a limiting frame is fixedly connected to the outer wall of the pipe body, and a centralizer main body is sleeved outside the limiting frame. According to the invention, by adopting the combination of the connector and the movable block, when the pressure contact switch on part of the movable blocks is extruded, the connectors on the adjacent movable blocks are locked through the conduction of the communicating pipe, so that the fixed ring and the movable ring cannot be further contracted to form a rigid centralizer, excessive deviation of the casing in a transverse well is prevented, and when the casing passes through a narrow diameter position, all the pressure contact switches are extruded, the locking of all the connectors is released, so that the fixed ring and the movable ring can be further contracted and smoothly pass through the narrow diameter position, and the flexible switching between the rigid centralizer and the flexible centralizer is realized, so that the casing has a very high centering effect.

Description

Anticreep sleeve centralizer

Technical Field

The invention relates to the technical field of centralizers, in particular to an anti-drop sleeve centralizer.

Background

The use of the casing centralizer is an important measure for improving the well cementation quality, namely, the casing centralizer is used for centering the casing as much as possible in well cementation, and the contact area between the casing and the well wall is reduced due to the support of the casing centralizer on the casing, so that the friction between the casing and the well wall is reduced, and the casing is facilitated to be put into the well.

When the elastic centralizer moves to a narrow diameter position in the vertical well, the arched sheets on the elastic centralizer deform, so that the resistance of the centralizer in an oil well is reduced, when the elastic centralizer moves in the horizontal well, the arched sheets below the centralizer are extruded due to the transverse arrangement of the casing, the casing is positioned in the middle of the horizontal well and is deflected downwards, the centering of the centralizer on the casing is reduced, the rigid centralizer is positioned in the horizontal well and cannot deform, so that the casing is positioned in the middle of the horizontal well, but when the rigid centralizer moves in the well, the rigid centralizer cannot deform, so that the rigid centralizer collides with the well wall vertical well when moving to the narrow diameter position, and the well wall rock falls down, collides or breaks down the casing downwards.

Disclosure of Invention

The invention aims to solve the problems in the background art and provides an anti-drop sleeve centralizer.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The utility model provides an anticreep sleeve centralizer, includes the body, the outer wall fixedly connected with spacing of body, the outside cover of spacing is equipped with the centralizer main part, the centralizer main part includes solid fixed ring and expansion ring, be provided with a plurality of evenly distributed's cambered plate between solid fixed ring and the expansion ring, gu fixed ring's outer wall fixedly connected with a plurality of evenly distributed's fixing base, expansion ring's outer wall sliding connection has a plurality of evenly distributed's movable block, cambered plate's both ends respectively with fixing base, movable block rotate to be connected, the inboard of centralizer main part is provided with a plurality of evenly distributed's connector, the one end and the solid fixed ring fixed connection of connector, the other end and the expansion ring fixed connection of connector; the outer wall threaded connection of expansion ring has the lantern ring, one side swing joint that the movable block is close to the lantern ring has the pressure to touch the switch, first post chamber has been seted up to the inside of movable block, the inner wall sliding connection of first post chamber has the piston piece, the tip of piston piece and the one end fixed connection who presses the touch the switch, the inner wall fixedly connected with of first post chamber is to the first spring that the piston piece reset, inlet channel, exhaust passage and pressure release passageway have been seted up to the inside of movable block, the one end of exhaust passage is linked together with the inside of first post chamber, the one end of pressure release passageway is linked together with the inside of inlet channel, the one end that the pressure release passageway was kept away from to the inlet channel is linked together to the piston piece department of first post intracavity portion, the internally mounted of connector has pneumatic locking structure, and with locking connector after inflating, the one end and the pneumatic locking structure are connected with communicating pipe of inlet channel, the one end that the pneumatic locking structure was kept away from to the inlet channel is linked together with the exhaust passage on the adjacent movable block.

Further, the connector comprises a movable sleeve and an inner rod, the inner wall of the movable sleeve is in sliding connection with the outer wall of the inner rod, one end of the inner rod is fixedly connected with a movable ring, a pneumatic locking structure is arranged inside the inner rod, one end of the movable sleeve, which is far away from a movable block, is fixedly connected with a stand column, the movable sleeve is fixedly connected with a fixed ring through the set stand column, a plurality of positioning holes matched with the pneumatic locking structure are formed in the outer wall of the movable sleeve, a second spring is sleeved outside the movable sleeve, and two ends of the second spring are fixedly connected with the stand column and the movable ring respectively.

Further, the pneumatic locking structure comprises a second cylinder cavity arranged inside the inner rod, the inner wall of the second cylinder cavity is slidably connected with a locking plug matched with the positioning hole, a gas transmission channel is arranged inside the inner rod, one end of the gas transmission channel is communicated with the second cylinder cavity, the other end of the gas transmission channel is fixedly connected with a spiral gas pipe, one end of the spiral gas pipe, far away from the gas transmission channel, is communicated with the gas inlet channel, and the inner wall of the gas transmission channel is fixedly connected with an elastic rope for resetting the locking plug.

Further, the locking plug comprises a cylindrical piston, the inner wall of the cylindrical piston is connected with the plunger in a sliding mode, a third spring is fixedly connected to the inner wall of the cylindrical piston, and one end of the third spring is fixedly connected with the end portion of the plunger.

Further, the arc wall has been seted up to the one end that the movable block is close to the lantern ring, press the middle part that touches the switch and be located the arc wall, the one end fixedly connected with clamping ring that the lantern ring is close to the movable block, clamping ring and arc wall looks adaptation.

Further, a chute for the movable block to move is formed in the outer wall of the movable ring, a limiting rod is fixedly connected to the inner wall of the chute, and the movable block is slidably connected with the outer wall of the limiting rod.

Further, the limiting frame comprises two mounting rings, the mounting rings are fixedly connected with the outer wall of the pipe body, and a plurality of connecting pieces are fixedly connected between the two mounting rings.

Further, a limit sleeve is fixedly connected to the outer edge of one side of the mounting ring, which is close to the connecting sheet.

Compared with the prior art, the invention has the following beneficial effects:

1. When the sleeve moves in the horizontal well, the sleeve is horizontally placed, the sleeve moves downwards under the action of gravity, the cambered plate at the bottom is extruded, the movable block connected with the tail end of the cambered plate at the bottom slides along the movable ring, the pressure contact switch on the movable block is pressed by the lantern ring to drive the movable block to slide in the first column cavity, gas in the first column cavity is conveyed to the adjacent movable block through the exhaust channel and the communicating pipe and conveyed to the inside of the pneumatic locking structure through the air inlet channel, so that the pneumatic locking structure locks the connector, the adjacent connector cannot slide any more, and the fixed ring and the movable ring cannot be further contracted to form a rigid centralizer, and excessive deflection of the sleeve in the transverse well is avoided;

2. When moving to the narrow diameter position, all the cambered plates are extruded, all the movable blocks slide to the lantern ring, all the pressure contact switches are extruded, and all the pneumatic locking structures release pressure to release locking, so that the cambered plates can be further contracted and smoothly pass through the narrow well;

3. After the piston block passes through the narrow diameter part, the well diameter is restored, under the elastic action of the cambered plate, the middle part of the cambered plate protrudes towards the outer side, the cambered plate pulls the movable block to move towards the direction away from the lantern ring, the piston block is reset under the elastic pushing of the first spring, and the gas in the piston block is discharged from a gap at the pressure contact switch until the piston block blocks the pressure release channel, so that the reset is completed;

In summary, the combination of the connector and the movable block is adopted, when the pressure contact switch on part of the movable blocks is extruded, the connectors on the adjacent movable blocks are locked through the conduction of the communicating pipe, so that the fixed ring and the movable ring cannot be further contracted to form a rigid centralizer, excessive deviation of the casing in the transverse well is prevented, when the casing passes through a narrow diameter position, the pressure contact switch is extruded, the locking of all the connectors is released, the fixed ring and the movable ring can be further contracted, and the narrow diameter position can be smoothly passed, so that the flexible switching between the rigid centralizer and the flexible centralizer is realized, and the casing is ensured to have a very high centering effect.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic illustration of the connection of a stop block and a centralizer body of the present invention;

FIG. 3 is a cross-sectional view of the structure of the stop block and centralizer body of the invention;

FIG. 4 is a cross-sectional view of the movable block of the present invention;

FIG. 5 is a schematic perspective view of a spacing frame according to the present invention;

FIG. 6 is an enlarged schematic view of the structure of FIG. 2A in accordance with the present invention;

FIG. 7 is an enlarged schematic view of the structure of FIG. 3B in accordance with the present invention;

FIG. 8 is an enlarged schematic view of the structure of FIG. 3D in accordance with the present invention;

FIG. 9 is an enlarged schematic view of the structure of FIG. 3C in accordance with the present invention;

FIG. 10 is a schematic perspective view of the centralizer body of the present invention;

fig. 11 is an enlarged schematic view of the structure at E in fig. 10 according to the present invention.

In the figure: 1. a tube body; 2. a limiting frame; 3. a centralizer body; 4. a connector; 5. a fixing ring; 6. a movable ring; 7. a fixing seat; 8. a cambered plate; 9. a movable block; 10. a pressure contact switch; 11. a movable sleeve; 12. an inner rod; 13. a first column cavity; 14. a piston block; 15. a first spring; 16. an air intake passage; 17. positioning holes; 18. a mounting ring; 19. a connecting sheet; 20. a limit sleeve; 21. a column; 22. a second spring; 23. a chute; 24. a limit rod; 25. a collar; 26. a compression ring; 27. an arc-shaped groove; 28. a second column chamber; 29. a third spring; 30. inserting a column; 31. an elastic rope; 32. a gas transmission channel; 33. an exhaust passage; 34. a pressure relief channel; 35. a communicating pipe; 36. a cylindrical piston; 37. a spiral air pipe.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1-11, an anti-drop sleeve centralizer comprises a pipe body 1, wherein the outer wall of the pipe body 1 is fixedly connected with a limiting frame 2, a plurality of pipe bodies 1 are generally connected together through a threaded joint, the limiting frame 2 is installed at a position close to the threaded joint, a centralizer main body 3 is sleeved outside the limiting frame 2, the centralizer main body 3 comprises a fixed ring 5 and a movable ring 6, a plurality of uniformly distributed arched plates 8 are arranged between the fixed ring 5 and the movable ring 6, a plurality of uniformly distributed fixed seats 7 are fixedly connected to the outer wall of the fixed ring 5, a plurality of uniformly distributed movable blocks 9 are slidingly connected to the outer wall of the movable ring 6, two ends of the arched plates 8 are respectively connected with the fixed seats 7 and the movable blocks 9 in a rotating manner, a plurality of uniformly distributed connectors 4 are arranged on the inner side of the centralizer main body 3, one end of each connector 4 is fixedly connected with the fixed ring 5, and the other end of each connector 4 is fixedly connected with the movable ring 6; the outer wall threaded connection of expansion ring 6 has lantern ring 25, one side swing joint that movable block 9 is close to lantern ring 25 has pressure to touch switch 10, be clearance fit between movable block 9 and the pressure to touch switch 10, the inside air of first post chamber 13 can follow the space department discharge between movable block 9 and pressure to touch switch 10, first post chamber 13 has been seted up to the inside of movable block 9, the inner wall sliding connection of first post chamber 13 has piston block 14, the tip of piston block 14 and the one end fixed connection of pressure to touch switch 10, the first spring 15 that the inner wall fixed connection of first post chamber 13 reset piston block 14, the inside of movable block 9 has seted up inlet channel 16, exhaust channel 33 and pressure release channel 34, the one end of exhaust channel 33 is linked together with the inside of first post chamber 13, the one end of pressure release channel 34 is linked together with the inside of inlet channel 16, the one end that pressure release channel 34 kept away from inlet channel 16 is linked together to the inside piston block 14 of first post chamber 13, the internally mounted locking structure of connector 4, pneumatic locking structure is with the locking connector 4 after aerifing, the tip and the one end of pressure release channel 16 is linked together with pressure release channel 34 and the pressure release channel 34 is kept away from the inside of pressure release channel 34, the pressure release channel 35 is linked together with the pressure release channel 35 when the pressure release channel is linked together with the piston channel 9 and the pressure release channel is kept away from the inside of pressure release channel 34, the pressure release channel is linked together with the pressure release channel 35 when the pressure release channel is linked together with the pressure release channel is located.

When the invention moves in a horizontal well, the sleeve is horizontally placed, the sleeve moves downwards under the action of gravity, the cambered plate 8 at the bottom is extruded, the movable block 9 connected with the tail end of the cambered plate 8 at the bottom slides along the movable ring 6, the pressure contact switch 10 on the movable block 9 is pressed by the sleeve ring 25 to drive the movable block 14 to slide in the first column cavity 13, the pressure release channel 34 is misplaced with the movable block 14, the pressure release channel 34 can exhaust from the pressure contact switch 10, the pressure release channel 34 and the air inlet channel 16 are connected to the current pneumatic locking structure, so that the current pneumatic locking structure releases pressure and is unlocked, meanwhile, the air in the first column cavity 13 is conveyed to the adjacent movable block 9 through the air outlet channel 33 and the communicating pipe 35, and is conveyed to the inside of the pneumatic locking structure through the air inlet channel 16, so that the pneumatic locking structure locks the connector 4, and the adjacent connector 4 can not slide any more, the fixed ring 5 and the movable ring 6 are limited to be unable to be further contracted, so that the fixed ring 5 and the movable ring 6 become a rigid centralizer, excessive deflection of the sleeve in the transverse well is avoided, all the bow-shaped plates 8 are extruded when the sleeve moves to a narrow diameter position in a vertical shaft or in the transverse well, all the movable blocks 9 slide to the collar 25, all the pressure contact switches 10 are extruded, all the pneumatic locking structures are decompressed and unlocked, the bow-shaped plates 8 can be further contracted, smoothly pass through the narrow diameter position, after passing through the narrow diameter position, the well diameter is restored, the middle part of the bow-shaped plates 8 bulges towards the outer side under the elastic action of the bow-shaped plates 8, the bow-shaped plates 8 pull the movable blocks 9 to move away from the collar 25, the piston blocks 14 are reset under the elastic pushing of the first springs 15, internal gas is discharged from a gap at the pressure contact switches 10, the reset is completed until the piston block 14 blocks the pressure relief passage 34.

In summary, the invention adopts the combination of the connector 4 and the movable block 9, when the pressure contact switch 10 on part of the movable block 9 is extruded, the connector 4 on the adjacent movable block 9 is locked by the conduction of the communicating pipe 35, so that the connector 5 and the movable ring 6 cannot be further contracted to form a rigid centralizer, the casing is prevented from being excessively deviated in the transverse well, and when the connector passes through a narrow diameter position, all the pressure contact switches 10 are extruded, the locking of all the connectors 4 is released, so that the connector 5 and the movable ring 6 can be further contracted, and the flexible switching between the rigid centralizer and the flexible centralizer can be smoothly realized, and the high centering effect of the casing is ensured.

As an preference, the connector 4 includes movable sleeve 11 and interior pole 12, the inner wall of movable sleeve 11 and the outer wall sliding connection of interior pole 12, the one end and the loose collar 6 fixed connection of interior pole 12, pneumatic locking structure installs in the inside of interior pole 12, the one end fixedly connected with stand 21 of movable sleeve 11 keeping away from movable block 9, movable sleeve 11 is through stand 21 and solid fixed ring 5 fixed connection that set up, a plurality of locating holes 17 that match with pneumatic locking structure have been seted up to the outer wall of movable sleeve 11, the outside cover of movable sleeve 11 is equipped with second spring 22, the both ends of second spring 22 respectively with stand 21, loose collar 6 fixed connection, the setting of second spring 22 can promote loose collar 6, make movable block 9 on the loose collar 6 be in the position that is close to interior pole 12 department, pneumatic locking structure is including the second cylinder 28 of seting up inside interior pole 12, the inner wall sliding connection of second cylinder 28 has the locking plug with locating hole 17 matched with, the inside seting up of interior pole 12 has channel 32, the one end and the second cylinder 28 of channel 32 are linked together, the other end of air pipe channel 32 is connected with the locating hole 17, the other end of air pipe channel 32 is fixed connection's 37 has the third cylinder-shaped piston 36 to insert the inner wall 30 of air pipe channel, the piston 36 is connected with the inner wall of cylinder-shaped piston 36 fixed connection, piston 36 is kept away from the piston 36, piston end of cylinder-shaped piston 36 fixed connection is connected with the piston 36, the piston of the piston is fixed connection.

In this embodiment, the pressure contact switch 10 is pressed, the piston block 14 conveys the gas inside the first column cavity 13 to the air inlet channel 16 on the adjacent movable block 9 along the air outlet channel 33 and the communicating pipe 35, and conveys the gas to the inside of the second column cavity 28 through the spiral air pipe 37 and the air conveying channel 32, so that the cylindrical piston 36 is pushed to slide inside the second column cavity 28, the piston block 30 is clamped at the positioning hole 17 to clamp between the movable sleeve 11 and the inner rod 12, when the piston block 30 is not aligned with the positioning hole 17, the piston block 30 is propped against the inner wall of the movable sleeve 11, the third spring 29 is compressed, the inner rod 12 slides relative to the movable sleeve 11, when the piston block 30 is aligned with the positioning hole 17, the piston block 30 is rapidly ejected and clamped inside the positioning hole 17, the relative sliding between the movable sleeve 11 and the inner rod 12 is prevented, when the piston block 14 inside the movable block 9 moves to stop the pressure release channel 34, the elastic rope 31 inside the inner rod 12 close to the movable block 9 pulls the cylindrical piston 36, so that the piston 36 is not locked to the positioning hole 17.

Preferably, the movable block 9 is close to one end of the lantern ring 25 and is provided with the arc groove 27, the press-contact switch 10 is located in the middle of the arc groove 27, one end of the lantern ring 25 close to the movable block 9 is fixedly connected with the pressing ring 26, the pressing ring 26 is matched with the arc groove 27, the radius of the arc groove 27 is identical to that of the pressing ring 26, the lantern ring 25 is rotated, the distance between the pressing ring 26 and the press-contact switch 10 can be adjusted, the trigger stroke of the press-contact switch 10 can be adjusted according to the actual well diameter, the press-contact switch 10 is moved along the first column cavity 13 after being propped against the pressing ring 26 until the pressing ring 26 is completely inserted into the inner side of the arc groove 27, and the first column cavity 13 stops moving.

Preferably, the outer wall of the movable ring 6 is provided with a chute 23 for the movable block 9 to move, the inner wall of the chute 23 is fixedly connected with a limiting rod 24, the movable block 9 is slidably connected with the outer wall of the limiting rod 24, and the limiting rod 24 plays a role in limiting the movable block 9.

Preferably, the limiting frame 2 comprises two mounting rings 18, the mounting rings 18 are fixedly connected with the outer wall of the pipe body 1, a plurality of connecting pieces 19 are fixedly connected between the two mounting rings 18, a limiting sleeve 20 is fixedly connected to the outer edge of one side of the mounting rings 18, which is close to the connecting pieces 19, specifically, the whole limiting frame 2 is used for providing a space for deformation of the centralizer body 3, and the limiting sleeve 20 is used for blocking the centralizer body 3 and limiting the centralizer body 3.

Working principle: when the invention moves in a horizontal well, when the sleeve is horizontally moved, the sleeve moves downwards under the action of gravity to extrude the bottom arched plate 8, the movable block 9 connected with the tail end of the bottom arched plate 8 slides along the movable ring 6, the pressure contact switch 10 on the movable block 9 is pressed by the lantern ring 25, on one hand, the piston block 14 is driven to slide in the first column cavity 13, the pressure release channel 34 and the piston block 14 are dislocated, the pressure release channel 34 can exhaust from the pressure contact switch 10, the pressure release channel 34 and the air inlet channel 16 are connected to the current pneumatic locking structure, so that the current pneumatic locking structure releases the locking, the elastic rope 31 close to the inner rod 12 of the movable block 9 can pull the cylindrical piston 36 when the pressure release channel 34 is not blocked, so that the cylindrical piston 36 is reset and locked to the positioning hole 17, on the other hand, when the pressure contact switch 10 is pressed by the lantern ring 25, the air in the first column cavity 13 is conveyed to the adjacent movable block 9 through the air outlet channel 33 and the communicating pipe 35, the pressure release channel 34 can be conveyed to the inner part of the air inlet channel 16, so that the inner rod 4 is locked by the pneumatic locking structure, the cylindrical piston rod 16 is blocked by the piston rod 36 and the cylindrical piston 36 is pushed by the piston rod 36 to the inner rod 12, the cylindrical piston 17 is pushed by the piston rod 36 to the inner rod 13, the cylindrical piston 17 is pushed by the piston rod 30, the piston rod 36 is pushed by the piston rod 13 to the inner rod 13, the cylindrical piston rod 30 is pushed by the piston rod 13 to the piston rod 30, and the piston rod 30 is pushed by the piston rod 30 to the piston rod 13 to be aligned with the inner hole 30, and the positioning hole 30, and the piston rod 30 is positioned in the inner hole of the piston hole is positioned in the piston hole, and the piston hole is positioned in the piston hole 13, the third spring 29 is compressed, when the inner rod 12 slides relative to the movable sleeve 11, the plunger 30 can pop out rapidly and is blocked in the positioning hole 17 when the plunger 30 aligns to the positioning hole 17, the relative sliding between the movable sleeve 11 and the inner rod 12 is prevented, the piston block 14 in the movable block 9 moves, the adjacent connector 4 cannot slide any more, the fixed ring 5 and the movable ring 6 cannot be further contracted, the movable block is made into a rigid centralizer, excessive deviation of the sleeve in the transverse well is avoided, all the bow-shaped plates 8 can be extruded when moving to a narrow diameter position in the vertical shaft or the transverse well, all the movable blocks 9 slide to the collar 25, all the pressure contact switches 10 are extruded, all the pneumatic locking structures release the locking, the pressure release principle is as described above, the bow-shaped plates 8 can further contract, the whole device becomes an elastic centralizer after passing through the narrow diameter position smoothly, the middle part of the bow-shaped plates 8 is restored to the narrow diameter position, the middle part of the bow-shaped plates 8 is pulled towards the outer sides of the movable blocks 9, the piston blocks are pushed towards the inner sides of the piston blocks 14, the reset channels are pushed towards the inner sides of the piston blocks 14, and the reset channels are pushed towards the reset channels 14, and the reset channels are completed.

Further, the above-described fixed connection is to be understood in a broad sense, unless explicitly stated and defined otherwise, as being, for example, welded, glued, or integrally formed, as is well known to those skilled in the art.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. The utility model provides an anticreep sleeve centralizer, includes body (1), the outer wall fixedly connected with spacing (2) of body (1), the outside cover of spacing (2) is equipped with centralizer main part (3), its characterized in that: the centralizer comprises a centralizer body (3), and is characterized in that the centralizer body (3) comprises a fixed ring (5) and a movable ring (6), a plurality of evenly-distributed arched plates (8) are arranged between the fixed ring (5) and the movable ring (6), a plurality of evenly-distributed fixing seats (7) are fixedly connected to the outer wall of the fixed ring (5), a plurality of evenly-distributed movable blocks (9) are slidingly connected to the outer wall of the movable ring (6), two ends of the arched plates (8) are respectively connected with the fixing seats (7) and the movable blocks (9) in a rotating mode, a plurality of evenly-distributed connectors (4) are arranged on the inner side of the centralizer body (3), one end of each connector (4) is fixedly connected with the fixed ring (5), and the other end of each connector (4) is fixedly connected with the movable ring (6);

The outer wall threaded connection of the movable ring (6) has a lantern ring (25), one side swing joint that the movable block (9) is close to lantern ring (25) has pressure to touch switch (10), the inside of the movable block (9) has seted up first post chamber (13), the inner wall sliding connection of first post chamber (13) has piston block (14), the tip of piston block (14) and the one end fixed connection of pressure to touch switch (10), the inner wall fixed connection of first post chamber (13) has first spring (15) to reset piston block (14), air inlet channel (16), exhaust channel (33) and pressure release passageway (34) have been seted up to the inside of movable block (9), the one end of exhaust channel (33) is linked together with the inside of first post chamber (13), the one end of pressure release passageway (34) is linked together with the inside of air inlet channel (16), the one end that pressure release passageway (34) kept away from air inlet channel (16) is linked together to the piston block (14) department inside first post chamber (13), the inside of connector (4) is equipped with air inlet locking structure, air inlet locking structure (35) are kept away from to the inside of pneumatic locking structure, air inlet channel (16) is locked in the pneumatic locking structure is connected with the pneumatic structure (35, one end of the communicating pipe (35) far away from the air inlet channel (16) is communicated with the air outlet channel (33) on the adjacent movable block (9).

2. The anti-slip over centralizer of claim 1, wherein: connector (4) are including movable sleeve (11) and interior pole (12), the inner wall of movable sleeve (11) and the outer wall sliding connection of interior pole (12), the one end and the expansion link (6) fixed connection of interior pole (12), pneumatic locking structure installs in the inside of interior pole (12), the one end fixedly connected with stand (21) of movable block (9) are kept away from to movable sleeve (11), and movable sleeve (11) are through stand (21) and solid fixed ring (5) fixed connection that set up, a plurality of locating holes (17) with pneumatic locking structure matched with are seted up to the outer wall of movable sleeve (11), the outside cover of movable sleeve (11) is equipped with second spring (22), the both ends of second spring (22) are with stand (21), expansion link (6) fixed connection respectively.

3. The anti-slip over centralizer of claim 2, wherein: the pneumatic locking structure comprises a second cylinder (28) arranged inside an inner rod (12), a locking plug matched with a positioning hole (17) is slidably connected to the inner wall of the second cylinder (28), a gas transmission channel (32) is arranged inside the inner rod (12), one end of the gas transmission channel (32) is communicated with the second cylinder (28), a spiral air pipe (37) is fixedly connected to the other end of the gas transmission channel (32), one end, far away from the gas transmission channel (32), of the spiral air pipe (37) is communicated with an air inlet channel (16), and an elastic rope (31) for resetting the locking plug is fixedly connected to the inner wall of the gas transmission channel (32).

4. A slip-off prevention sleeve centralizer according to claim 3, wherein: the locking plug comprises a cylindrical piston (36), the inner wall of the cylindrical piston (36) is connected with the plunger (30) in a sliding mode, a third spring (29) is fixedly connected to the inner wall of the cylindrical piston (36), and one end of the third spring (29) is fixedly connected with the end portion of the plunger (30).

5. The anti-slip over centralizer of claim 1, wherein: the utility model discloses a pressure switch, including movable block (9), press contact switch, clamping ring (26), arc wall (27) have been seted up to the one end that movable block (9) is close to lantern ring (25), press contact switch (10) are located the middle part of arc wall (27), the one end fixedly connected with clamping ring (26) that lantern ring (25) are close to movable block (9), clamping ring (26) and arc wall (27) looks adaptation.

6. The anti-slip over centralizer of claim 1, wherein: the outer wall of the movable ring (6) is provided with a chute (23) for the movable block (9) to move, the inner wall of the chute (23) is fixedly connected with a limiting rod (24), and the movable block (9) is in sliding connection with the outer wall of the limiting rod (24).

7. The anti-slip over centralizer of claim 1, wherein: the limiting frame (2) comprises two mounting rings (18), the mounting rings (18) are fixedly connected with the outer wall of the pipe body (1), and a plurality of connecting sheets (19) are fixedly connected between the two mounting rings (18).

8. The anti-slip over centralizer of claim 7, wherein: and a limit sleeve (20) is fixedly connected to the outer edge of one side of the mounting ring (18) close to the connecting sheet (19).