CN111827922B

CN111827922B - Drilling-free stage cementing device

Info

Publication number: CN111827922B
Application number: CN202010688877.XA
Authority: CN
Inventors: 万宏辉; 张雷; 李崇芹
Original assignee: Jiangsu Saiwei Petroleum Technology Co ltd
Current assignee: Jiangsu Saiwei Petroleum Technology Co ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2022-11-18
Anticipated expiration: 2040-07-17
Also published as: CN111827922A

Abstract

The utility model relates to a well cementation operation technical field discloses a exempt from to bore stage cementing ware, which comprises a body, body both ends threaded connection has top connection and lower clutch respectively, set up the circulation hole that runs through its lateral wall on the body, the inside cooperation of sliding of body has the seat of opening and close the sleeve that is used for opening and close the circulation hole, this internal release mechanism that is used for the restriction to open the seat and closes the sleeve gliding that is equipped with, it has the sliding sleeve to close the interior sliding fit of sleeve, can fill in the sliding sleeve and close the stopper rather than the inseparable laminating of inner wall, it also is equipped with release mechanism to close between sleeve and the sliding sleeve, release mechanism includes the shear pin. This application utilizes the shear pin to be connected and opened seat and body, close sleeve and body and sliding sleeve and close the sleeve, and when the shear pin on closing the sleeve received pressure fracture, the sliding sleeve gliding was until breaking away from the body for the body link up from top to bottom, when having eliminated and sweeping the stopper and to the inside influence that produces of body, reduced the probability that the well cementation accident took place, improved the reliability of hierarchical cementing ware.

Description

Drilling-free stage cementing device

Technical Field

The application relates to the technical field of well cementation operation, in particular to a drilling-free stage cementing device.

Background

Well cementation is an important operation in the drilling process, and the operation process is as follows: a casing string with a certain size is put into the well, cement paste is injected around the casing string, and then the casing is fixed on the well wall, so that the casing is prevented from being corroded; with the increasing of the well depth, the primary well cementation can not meet the well cementation requirement of the deep well, and the requirement of the well cementation process can be ensured only by adopting two-stage or even multi-stage well cementation; the stage cementing device is a key tool for implementing stage cementing, and after the conventional mechanical stage cementing device completes the stage cementing well, related accessories need to be drilled out to keep the consistency with a casing; the current common method for removing accessories by drilling is to clean the accessories by drilling, and the defects of the method are as follows: the sliding sleeve is easy to be damaged and closed during plug sweeping; when the drill is pulled out after the plug is swept, the sliding sleeve can be opened and closed, and the defects can cause the sealing failure of the whole tubular column and cause the quality accident of well cementation; to solve this problem we propose a drill-free stage cementing device, the attachment of which can fall freely without needing to be swept out by drilling.

Disclosure of Invention

To the not enough that prior art exists, this application provides a exempt from to bore stage cementing ware.

The application provides a exempt from to bore stage cementing ware adopts following technical scheme:

the utility model provides an exempt from to bore stage cementing ware, includes the body, body both ends threaded connection has top connection and lower clutch respectively, set up the circulation hole that runs through its lateral wall on the body, the inside cooperation of sliding of body has the seat of opening that is used for opening the circulation hole and is used for closing the sleeve that closes of circulation hole, this internal release mechanism that is used for the restriction to open the seat and closes the sleeve gliding that is equipped with, it has the sliding sleeve to close the interior sliding fit of sleeve, can fill in the sliding sleeve and close the stopper rather than the inseparable laminating of inner wall, close the sleeve with also be equipped with release mechanism between the sliding sleeve, release mechanism includes the shear pin.

By adopting the technical scheme, the opening seat and the body, the closing sleeve and the body, and the sliding sleeve and the closing sleeve are connected by the shear pins, when the shear pins on the body are broken by pressure, the opening seat/the closing sleeve slide downwards to open/close the circulating hole; when the shear pin on the closing sleeve is fractured under pressure, the sliding sleeve slides downwards along the closing sleeve, and finally breaks away from the closing sleeve and the body under the action of gravity, so that the body is communicated from top to bottom, the downward drilling is not needed for cleaning, the influence on the inside of the body easily generated during plug cleaning is eliminated, the probability of occurrence of well cementation accidents is reduced, and the reliability of the stage cementing device is improved.

Preferably, the body inner wall with close and all offer the mounting hole that is used for installing the shear pin on the sleeve inner wall, open and all offer on seat outer wall, the closure sleeve outer wall and the sliding sleeve outer wall and supply shear pin male pinhole, just the body with open the shear strength of shear pin between the seat and be less than the body with close the shear strength of shear pin between the sleeve, the body with close the shear strength of shear pin between the sleeve and be less than close the sleeve with the shear strength of shear pin between the sliding sleeve.

Through adopting above-mentioned technical scheme, utilize the difference of shear strength of shear pin, controlled the removal order of opening the seat, closing sleeve and sliding sleeve to this realization opens earlier the circulation hole, closes the circulation hole again, and the process that the sliding sleeve breaks away from at last.

Preferably, the shear pin comprises a shear section and a fixed cylinder, wherein one end of the shear section is in plug-in fit with the pin hole, the fixed cylinder is located in the mounting hole, and the other end of the shear section is in plug-in fit with the fixed cylinder.

Through adopting above-mentioned technical scheme, utilize the solid fixed cylinder to support the shear segment to this avoids the shear segment direct and mounting hole contact and receives wearing and tearing.

Preferably, the middle part of the shearing section is provided with a groove, and a plurality of gaskets detachably connected with the fixed cylinder are stacked between the end part of the fixed cylinder and the end part of the shearing section.

Through adopting above-mentioned technical scheme, the setting up of groove makes the fracture position of shear pin obtain injecing to utilize the quantity control of gasket to cut the position of section and groove, be applicable to the stage cementing ware of different dimensions with this.

Preferably, a protective plug is in threaded fit in the mounting hole, and an expansion sheet made of an expandable material is filled between the protective plug and the fixed cylinder.

Through adopting above-mentioned technical scheme, will expand the piece setting between protection stopper and solid fixed cylinder, utilize the characteristic that the piece can expand to extrude solid fixed cylinder to the body is inside to this compactness between improvement shear pin and the pinhole avoids the shear pin to take place to become flexible at stage cementing ware transportation and on-the-spot well entry in-process, has improved shear pin's reliability.

Preferably, the edge of the bottom end of the sliding sleeve is a conical surface, and the inclination angle of the conical surface is 45 degrees.

By adopting the technical scheme, the design of the conical surface facilitates the sliding sleeve to pass in and out to close the sleeve, and the sliding sleeve is favorable for falling into the well bottom.

Preferably, close the stopper and include that metal core and cover establish the rubber sleeve outside the metal core, rubber sleeve week side integrated into one piece has a plurality ofly to have elasticity and support tight flank with the sliding sleeve inner wall, rubber sleeve top integrated into one piece has to have elasticity and supports tight fin with sliding sleeve inner wall top.

By adopting the technical scheme, the sealing performance between the closing plug and the closing sleeve is ensured by utilizing the side wings and the tail wings, so that the pressure building and the slipping of the sliding sleeve are ensured to be smoothly carried out.

Preferably, a plurality of deep holes are formed in the top of the metal core, each deep hole is internally matched with a sliding rod with a top penetrating through the tail fin in a sliding mode, a plurality of fixed blocks with inclined planes are fixed on the sliding rod, a plurality of radial holes communicated with the deep holes are formed in the periphery of the metal core, a sliding block with one end clamped with the inner wall of the rubber sleeve is connected in the radial holes in a sliding mode, and an inclined plane abutting against the fixed blocks is arranged at one end, close to the sliding rod, of the sliding block.

By adopting the technical scheme, when the closing block is pressed, the pressure is transmitted to the sliding rod to drive the sliding rod to move along the deep hole, at the moment, the fixed block on the sliding rod pushes the sliding block to slide outwards along the radial hole, and the sliding block is tightly abutted against the rubber sleeve, so that the tightness between the rubber sleeve and the metal core is improved.

Preferably, open the seat and all seted up annular side groove on closing telescopic week lateral wall, the cooperation of sliding in the side groove has a plurality of arc fixture blocks, be fixed with the spring between side groove and the arc fixture block, set up on the body inner wall with the ring groove of arc fixture block joint.

Through adopting above-mentioned technical scheme, utilize the elasticity drive arc fixture block of spring to outwards slide to with ring groove block, with this restriction open the seat and close the sleeve gliding, ensure that the switching of circulation hole receives control.

Preferably, a sealing ring is arranged between the upper joint and the body; be equipped with the circular bead of contradicting with body bottom edge on the lower clutch, be equipped with seal assembly on the circular bead, seal assembly include with lower clutch inner wall interference fit's sealing ring, the sealing ring bottom is conical domatic, just it runs through to be fixed with a plurality of tops on the sealing ring the circular bead supports tight plugging block with body bottom edge.

Through adopting above-mentioned technical scheme, utilize domatic hydraulic pressure or atmospheric pressure in with the well to change into the thrust that supports tight shutoff piece to this leakproofness between lower clutch and the body has been improved.

In summary, the present application includes at least one of the following beneficial technical effects:

according to the scheme, the shear pin is used for connecting the opening seat and the body, the closing sleeve and the body, and the sliding sleeve and the closing sleeve, when the shear pin on the closing sleeve is broken by pressure, the sliding sleeve slides downwards until being separated from the body, so that the body is communicated up and down, the influence on the inside of the body during plug sweeping and the influence on the inside of the body are eliminated, the probability of well cementation accidents is reduced, the reliability of the graded cementing device is improved, drilling and sweeping are not needed, and the construction time and the operation cost are saved;

according to the scheme, the sealing performance between the closing plug and the closing sleeve is ensured by utilizing the side wings and the tail wings, so that the pressure building and the sliding of the sliding sleeve are ensured to be smoothly carried out;

this scheme utilization is domatic to be converted into the thrust of supporting tight shutoff piece with hydraulic pressure or atmospheric pressure in the well to this leakproofness between lower clutch and the body has been improved.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

Fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the present application.

Fig. 3 is an enlarged schematic view of the structure at a in fig. 2.

Fig. 4 is an enlarged schematic view of the structure at B in fig. 2.

Fig. 5 is a schematic sectional view showing a closed circulation hole in the embodiment of the present application.

Fig. 6 is a schematic view of the cross-sectional structure of the closing plug after explosion in the embodiment of the present application.

Fig. 7 is an enlarged schematic view of the structure at C in fig. 2.

Description of reference numerals: 1. a body; 11. a circulation hole; 12. opening the seat; 13. closing the sleeve; 14. a sliding sleeve; 15. an annular neck; 16. an annular groove; 2. an upper joint; 21. a step surface; 22. a convex ring; 3. a lower joint; 31. a shoulder; 311. an arc-shaped slot; 4. a release mechanism; 41. shearing the nails; 411. shearing and cutting; 412. a fixed cylinder; 413. a gasket; 414. a rubber block; 415. an intumescent sheet; 42. mounting holes; 421. a fixing hole; 43. a protective plug; 44. a pin hole; 5. closing the plug; 51. a metal core; 511. deep holes; 512. a radial bore; 513. a limiting groove; 52. a rubber sleeve; 521. connecting grooves; 522. a limiting ring; 523. a side wing; 524. a tail fin; 53. an anti-drop component; 531. a slide bar; 532. a fixed block; 533. a slider; 6. a seal assembly; 61. a seal ring; 611. a slope surface; 62. a plugging block; 7. a limiting mechanism; 71. a side groove; 72. an arc-shaped fixture block; 73. a spring.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a drilling-free stage cementing device.

Example 1

As shown in fig. 1, the drilling-free stage cementing device comprises a body 1, wherein the body 1 is in a circular tube shape, and an upper joint 2 and a lower joint 3 are respectively arranged at the upper end and the lower end of the body 1. Referring to fig. 2, the bottom half of the upper joint 2 has an outer diameter smaller than the top of the upper joint 2 and has an external thread thereon, and the top of the inner wall of the body 1 is provided with an internal thread, so as to realize the threaded connection between the upper joint 2 and the body 1. And a sealing ring is arranged between the upper joint 2 and the top edge of the body 1 and is O-shaped, so that the sealing property between the upper joint 2 and the body 1 is improved. The lower half part of the outer side wall of the lower joint 3 is conical, so that the lower joint can enter a well conveniently; the external diameter of the upper half part of the lower joint 3 is smaller than that of the middle part of the lower joint and is provided with an external thread, and an internal thread is arranged at the bottom of the inner wall of the body 1, so that the threaded connection between the lower joint 3 and the body 1 is realized.

As shown in fig. 3, the lower joint 3 is provided with a shoulder 31 abutting against the bottom edge of the body 1, the shoulder 31 is provided with a sealing assembly 6, and the sealing assembly 6 comprises a sealing ring 61 and a plugging block 62. The sealing ring 61 is annular, is positioned inside the lower joint 3 and is in interference fit with the inner wall of the lower joint 3; the lower surface of the sealing ring 61 is a slope 611, and the diameter of the top edge of the slope 611 is smaller than that of the bottom edge. The blocking piece 62 is made of rubber and has elasticity, and the blocking piece 62 has a plurality ofly, and each blocking piece 62 is arc, and a plurality of blocking pieces 62 evenly distributed is on the sealing ring 61 upper surface. A plurality of arc-shaped grooves 311 are formed in the shoulder 31, the arc-shaped grooves 311 are in insertion fit with the blocking block 62, and the top of the blocking block 62 is tightly abutted to the edge of the bottom of the body 1, so that a sealing effect is achieved. The design of the sloping surface 611 converts the hydraulic pressure or the air pressure in the well into a thrust force for tightly abutting against the plugging block 62, so that the sealing performance between the lower joint 3 and the body 1 is improved.

As shown in fig. 2, a circulation hole 11 is formed in the middle of the sidewall of the main body 1, and the circulation hole 11 penetrates through the sidewall of the main body 1 to communicate the inside and the outside of the main body 1. An opening seat 12 and a closing sleeve 13 are arranged inside the body 1, and the opening seat 12 and the closing sleeve 13 are both in a circular tube shape and are connected with the inner wall of the body 1 in a sliding manner. The opening seat 12 is located at the lower side of the closing sleeve 13, and the top of the opening seat 12 is higher than the circulation hole 11 to close the circulation hole 11. The release mechanism 4 is disposed between the opening seat 12 and the closing sleeve 13 and the body 1, and as shown in fig. 4, in this embodiment, the release mechanism 4 includes a shear pin 41, a mounting hole 42, a protection plug 43, and a pin hole 44. The mounting hole 42 is opened on the side wall of the body 1 and communicates with the outside of the body 1, and an internal thread is provided therein. Pin holes 44 are opened on the outer walls of the opening seat 12 and the closing sleeve 13 corresponding to the mounting holes 42. The shear pin 41 includes a shear segment 411, a stationary barrel 412, a washer 413, a rubber block 414, and an expansion piece 415. The shearing section 411 is cylindrical and made of metal, a groove convenient for shearing is formed in the middle of the shearing section 411, one end of the shearing section 411 is in insertion fit with the pin hole 44, and the rubber block 414 is fixed at one end, extending into the pin hole 44, of the shearing section 411 and used for preventing the shearing nail 41 from being collided and abraded in the process of being inserted into the pin hole 44; the fixed cylinder 412 is cylindrical, one end of the fixed cylinder with an opening faces the pin hole 44, and the other end of the cutting section 411 is in plug fit with the fixed cylinder 412. The gasket 413 is located between the fixed cylinder 412 and the end of the shearing section 411, the number of the gaskets 413 is several, and a user can change the positions of the shearing section 411 and the groove by adjusting the number of the gaskets 413, so that the device is suitable for graded cementing devices with different sizes and specifications. A fixing hole 421 for receiving the fixing cylinder 412 is communicated with the mounting hole 42, and an end of the fixing cylinder 412 having an opening is tightly pressed against an inner end of the fixing hole 421. The protective plug 43 is arranged in the mounting hole 42 in a threaded manner, so that the shear pin 41 is isolated from the outside of the body 1; the expansion sheet 415, which is located between the protective plug 43 and the fixed cylinder 412, is made of an expandable material, and in this embodiment, a material that expands when exposed to heat is selected. After the protection plug 43 is installed, the expansion piece 415 can be made to expand only by hot compress of hot water, so that the fixing barrel 412 is extruded towards the inside of the body 1, the tightness between the shear pin 41 and the pin hole 44 is improved, and looseness of the shear pin 41 in the process of transportation of the stage cementing device and field well entry is avoided.

As shown in fig. 2 and 4, a limiting mechanism 7 is disposed between the opening seat 12 and the closing sleeve 13 and the body 1, and the limiting mechanism 7 includes a side groove 71, an arc-shaped latch 72 and a spring 73. The side grooves 71 are multiple, and the multiple side grooves 71 are uniformly distributed on the peripheral side walls of the opening seat 12 and the closing sleeve 13 in a surrounding way; the arc-shaped blocks 72 are arc-shaped, the number of the arc-shaped blocks corresponds to that of the side grooves 71, and each arc-shaped block 72 is connected with the corresponding side groove 71 in a sliding mode. Spring 73 is secured between each arcuate latch 72 and side groove 71. An annular clamping groove 15 clamped with the arc-shaped clamping block 72 is formed in the inner wall of the body 1 and used for limiting the opening seat 12 and the closing sleeve 13 to slide downwards so as to ensure that the opening and closing of the circulating hole 11 are controlled.

As shown in fig. 4 and 5, a sliding sleeve 14 is disposed in the closing sleeve 13, the sliding sleeve 14 is a circular tube and is in sliding fit with the inner wall of the closing sleeve 13, the bottom edge of the sliding sleeve 14 is a conical surface, and the inclination angle of the conical surface is 45 °. A shear pin 41 is also arranged between the closing sleeve 13 and the sliding sleeve 14, and the structure of the shear pin 41 is the same as that of the shear pin 41 between the opening seat 12 and the body 1 and the shear pin 41 between the closing sleeve 13 and the body 1. The difference is that the mounting hole 42 opens on the closing sleeve 13 and the pin hole 44 opens on the sliding sleeve 14. And the shear strength of the shear pin 41 between the body 1 and the opening seat 12 is smaller than that of the shear pin 41 between the body 1 and the closing sleeve 13, and the shear strength of the shear pin 41 between the body 1 and the closing sleeve 13 is smaller than that of the shear pin 41 between the closing sleeve 13 and the sliding sleeve 14.

The sliding sleeve 14 is provided with a plug-in related closure 5, and as shown in fig. 6, the closure plug 5 comprises a metal core 51 and a rubber sleeve 52 sleeved on the metal core 51. The metal core 51 is made of metal, copper is selected as a material of the metal core 51 in the embodiment, the density of copper is higher than that of iron, the mass of the copper metal core 51 is larger than that of the iron metal core 51, the closing plug 5 is favorable for driving the sliding sleeve 14 to slide downwards, and the corrosion resistance of the copper metal core 51 is high. The rubber sleeve 52 is integrally made of rubber, has uniform texture and good elasticity; a plurality of side wings 523 which are tightly abutted against the inner wall of the sliding sleeve 14 are integrally formed on the peripheral side of the rubber sleeve 52, a tail wing 524 which is tightly abutted against the top of the inner wall of the sliding sleeve 14 is integrally formed on the top of the rubber sleeve 52, and the side wings 523 and the tail wing 524 are used for ensuring the sealing performance between the closing plug 5 and the closing sleeve 13. An annular limiting groove 513 is formed in the bottom of the periphery of the metal core 51, a limiting ring 522 is integrally formed at the bottom of the rubber sleeve 52, and the limiting ring 522 is in clamping fit with the limiting groove 513. The top of the metal core 51 is provided with a plurality of deep holes 511, the extending direction of the deep holes 511 is consistent with the length direction of the sliding sleeve 14, and a sliding rod 531 is matched in each deep hole 511 in a sliding manner; the top of the sliding rod 531 penetrates through the tail 524, the sliding rod 531 is a part of the anti-falling assembly 53, the anti-falling assembly 53 further comprises a plurality of fixing blocks 532 with inclined planes, and the distance from the edge of the upper surface of the fixing block 532 to the central axis of the sliding rod 531 is larger than the distance from the edge of the lower surface of the fixing block 532 to the central axis of the sliding rod 531; a plurality of radial holes 512 are formed on the peripheral side of the metal core 51, the extending direction of the radial holes 512 is consistent with the diameter direction of the metal core 51, and the radial holes 512 are communicated with the deep holes 511. A sliding block 533 is slidably connected in the radial hole 512, one end of the sliding block 533 is clamped with the inner wall of the rubber sleeve 52, the other end extends to the sliding rod 531, and an inclined plane abutting against the fixed block 532 is arranged at the end. When the pressure is being held, the closing plug 5 is pressed, the pressure is transmitted to the sliding rod 531, and the sliding rod 531 is driven to move downwards along the deep hole 511, at this time, the fixed block 532 on the sliding rod 531 pushes the sliding block 533 to slide outwards along the radial hole 512, so that the sliding block 533 is tightly abutted against the rubber sleeve 52, and the tightness between the rubber sleeve 52 and the metal core 51 is improved.

The implementation principle of the embodiment 1 is as follows: when the device is used, an operator puts the body 1 into a well, after the primary cementing device is pressed, the pressure in the well rises, the shear pin 41 between the opening seat 12 and the body 1 is cut off by the pressure on the opening seat 12, the opening seat 12 slides downwards to the position shown in figure 5, the arc-shaped clamping block 72 on the opening seat 12 is clamped with the annular clamping groove 15 on the inner wall of the body 1, the opening seat 12 stops sliding downwards, and the circulation hole 11 is opened; after the circulation hole 11 is opened, a circulation channel is built inside and outside the body 1, and secondary cementing operation is carried out. After cement is injected, the closing plug 5 is put into the sliding sleeve 14 and pressure is suppressed, at the moment, pressure is transmitted to the closing sleeve 13, the shear pin 41 between the closing sleeve 13 and the body 1 is gradually sheared, the closing sleeve 13 slides down to the position in the figure 5 from the position in the figure 1, at the moment, the arc-shaped clamping block 72 on the closing sleeve 13 is tightly clamped with the annular clamping groove 15 on the inner wall of the body 1, the closing sleeve 13 stops sliding down, the circulating hole 11 is closed, and secondary well cementation is completed. Then, the pressure continues to be suppressed, when the shear pin 41 on the sliding sleeve 14 is pressed and sheared, the sliding sleeve 14 slides downwards under the action of gravity and finally breaks away from the body 1 and falls into the well, and at the moment, the body 1 is communicated up and down. In the embodiment, the closing plug 5 is not required to be removed by drilling, so that the influence on the interior of the body 1 easily caused by plug removal is eliminated, the probability of well cementation accidents is reduced, and the reliability of the stage cementing device is improved.

Example 2

As shown in fig. 2, the difference between this embodiment and embodiment 1 is that in this embodiment, a step surface 21 is formed between the lower half part of the bottom of the upper joint 2 and the upper half part of the upper joint 2, two rings of convex rings 22 are integrally formed on the step surface 21, the cross section of the convex ring 22 is isosceles trapezoid, and the area of the bottom of the convex ring 22 is smaller than that of the top. The top edge of the body 1 is provided with an annular groove 16, and the annular groove 16 is clamped with a convex ring 22, so that the tightness and the sealing performance between the upper joint 2 and the body 1 are improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an exempt from to bore stage cementing ware, includes body (1), body (1) both ends respectively threaded connection have top connection (2) and lower clutch (3), set up circulation hole (11) that run through its lateral wall on body (1), body (1) inside cooperation of sliding has the seat (12) of opening that is used for opening circulation hole (11) and is used for closing the sleeve (13) that closes of circulation hole (11), be equipped with in body (1) and be used for the restriction to open seat (12) and close release mechanism (4) of sleeve (13) gliding, its characterized in that: sliding fit has sliding sleeve (14) in closing sleeve (13), can fill in sliding sleeve (14) with the closing stopper (5) of its inner wall close laminating, close sleeve (13) with also be equipped with release mechanism (4) between sliding sleeve (14), release mechanism (4) include shear pin (41), body (1) inner wall with all offer mounting hole (42) that are used for installing shear pin (41) on closing sleeve (13) inner wall, open seat (12) outer wall, close and all offer on sleeve (13) outer wall and sliding sleeve (14) outer wall and supply shear pin (41) male pinhole (44), just shear strength of shear pin (41) between body (1) and the opening seat (12) is less than shear strength of shear pin (41) between body (1) and the closing sleeve (13), shear strength of shear pin (41) between body (1) and the closing sleeve (13) is less than close sleeve (13) with the pinhole (41) between sliding sleeve (14), the fixed shear strength of shear pin (41) and the fixed section of pegging graft of inserting is located shear pin (411) and the other end of cutting section (411) and the cutting section (411) of inserting of cutting section (412), a protective plug (43) is matched in the mounting hole (42) in a threaded manner, and an expansion sheet (415) made of expandable material is filled between the protective plug (43) and the fixing barrel (412); a groove is formed in the middle of the shearing section (411), and a plurality of gaskets (413) detachably connected with the fixed cylinder (412) are stacked between the fixed cylinder (412) and the end of the shearing section (411); a sealing ring is arranged between the upper joint (2) and the body (1); a shoulder (31) which is abutted against the edge of the bottom of the body (1) is arranged on the lower connector (3), a sealing assembly (6) is arranged on the shoulder (31), the sealing assembly (6) comprises a sealing ring (61) which is in interference fit with the inner wall of the lower connector (3), the bottom of the sealing ring (61) is a conical slope surface (611), and a plurality of plugging blocks (62) the tops of which penetrate through the shoulder (31) and are abutted against the edge of the bottom of the body (1) are fixed on the sealing ring (61); blocking piece (62) are made by rubber, have elasticity, just blocking piece (62) have a plurality ofly, each blocking piece (62) are arc, and are a plurality of blocking piece (62) evenly distributed be in on sealing ring (61) upper surface, a plurality of arc wall (311) have been seted up on circular bead (31), arc wall (311) with blocking piece (62) are pegged graft the cooperation.

2. The drill-free stage cementing device according to claim 1, characterized in that: the edge of the bottom end of the sliding sleeve (14) is a conical surface, and the inclination angle of the conical surface is 45 degrees.

3. The drill-free stage cementing device according to claim 1, wherein: close stopper (5) and establish rubber sleeve (52) outside metal core (51) including metal core (51) and cover, rubber sleeve (52) week side integrated into one piece have a plurality of have elasticity and support tight flank (523) with sliding sleeve (14) inner wall, rubber sleeve (52) top integrated into one piece have elasticity and support tight fin (524) with sliding sleeve (14) inner wall top.

4. The drill-free stage cementing device according to claim 3, wherein: a plurality of deep holes (511) have been seted up at metal core (51) top, each all slide in deep hole (511) and cooperate the top to run through slide bar (531) of fin (524), be fixed with a plurality of fixed blocks (532) that have the inclined plane on slide bar (531), metal core (51) week side is seted up a plurality of radial holes (512) that communicate with deep hole (511), slide block (533) that are connected with one end and rubber sleeve (52) inner wall chucking in radial hole (512) interior, the one end that slide bar (531) is close to in slide block (533) is equipped with the inclined plane of contradicting with fixed block (532).

5. The drill-free stage cementing device according to claim 1, characterized in that: open seat (12) and all seted up annular side channel (71) on the week lateral wall of closing sleeve (13), side channel (71) internal slipping cooperation has a plurality of arc fixture block (72), be fixed with spring (73) between side channel (71) and arc fixture block (72), seted up on body (1) inner wall with annular slot (15) of arc fixture block (72) joint.