CN113863893A

CN113863893A - Drilling-free stage cementing device

Info

Publication number: CN113863893A
Application number: CN202111395178.7A
Authority: CN
Inventors: 蔡阳生; 王玉钰
Original assignee: Beijing Boxi Technology Co ltd
Current assignee: Beijing Boxi Technology Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2021-12-31
Anticipated expiration: 2041-11-23
Also published as: CN113863893B

Abstract

The invention relates to the technical field of drilling, production and well cementation of petroleum and natural gas, and particularly provides a drilling-free stage cementing device. The drilling-free stage cementing device comprises a body, a first sliding sleeve, a second sliding sleeve, a rubber plug sleeve, a blind plate member, a first blocking member and a second blocking member, wherein a first channel and a circulation hole are formed in the body; the first plugging member can plug the port of the rubber plug sleeve; a second channel is formed in the blind plate component and communicated with the first channel, and the inner diameter of a top port of the second channel is larger than that of a bottom port of the second channel; the second blocking member can be thrown into the second channel and block a bottom port of the second channel. Through the arrangement, when the casing is laid down, the first blocking component and the second blocking component are not put in, so that the inside of the casing can be kept smooth, and the inside of the casing can be circulated.

Description

Drilling-free stage cementing device

Technical Field

The invention relates to the technical field of drilling, production and well cementation of petroleum and natural gas, and particularly provides a drilling-free stage cementing device.

Background

For a long time, in the drilling, production and well cementation processes of petroleum, natural gas and coal bed gas, in order to solve the problem of well cementation that only the upper half well section and the lower half well section are not fixed, a half-way well cementation process is adopted. At present, a hydraulic stage cementing device and a half-way cementing assembly of a drillable blind plate are adopted.

However, the casing of such a hydraulic cementing apparatus and a half-way cementing assembly of drillable blind plates is plugged by the blind plate, resulting in failure of circulation within the casing during casing running and before cementing, which may affect the quality of the cementing.

Therefore, there is a need in the art for a new solution to the above problems.

Disclosure of Invention

The invention aims to solve the technical problems, namely, the problems that the casing of the existing stage cementing device is blocked by a blind plate, so that the circulation in the casing cannot be realized, and the well cementation quality can be influenced are solved.

In a first aspect, the present invention provides a drill-free stage cementing apparatus comprising: the device comprises a body, a first channel and a second channel, wherein the first channel is formed in the body, a circulating hole is formed in the side wall of the body, and the circulating hole is communicated with the first channel; a first sliding sleeve positioned in the first channel, wherein the outer side wall of the first sliding sleeve is in sealing butt joint with the inner side wall of the body, the first sliding sleeve is connected with the body through a first shearing pin, and the first sliding sleeve can move from a first position for closing the circulation hole to a second position for opening the circulation hole along the first channel when the first shearing pin is disconnected; the second sliding sleeve is positioned in the first channel and above the first sliding sleeve, the outer side wall of the second sliding sleeve is in sealing butt joint with the inner side wall of the body, the second sliding sleeve is connected with the body through a second shearing pin, and the second sliding sleeve can slide along the first channel when the second shearing pin is disconnected so as to close the circulating hole; the rubber plug sleeve is positioned in the second sliding sleeve, the outer side wall of the rubber plug sleeve is in sealing butt joint with the inner side wall of the second sliding sleeve, and the rubber plug sleeve is connected with the second sliding sleeve through a third shearing pin; a first plugging member which is an independent member and can be thrown into the rubber plug sleeve and plug a port of the rubber plug sleeve; the blind plate component is positioned in the first channel and is connected with the body through a fourth shear pin, the outer side wall of the blind plate component is in sealing butt joint with the inner side wall of the body, a second channel is formed in the blind plate component and is communicated with the first channel, and the inner diameter of a top port of the second channel is larger than that of a bottom port of the second channel; and a second blocking member that is an independent member that can be thrown into the second channel and blocks the bottom port of the second channel.

In the above preferred technical solution of the drilling-free stage cementing device, the drilling-free stage cementing device further comprises a rubber sleeve, which is sleeved on the outer side wall of the body, the body is provided with a through hole structure at a position corresponding to the rubber sleeve, the through hole structure is communicated with the first channel, and the blind plate member can move from a first position closing the through hole structure to a second position opening the through hole structure when the fourth shearing pin is disconnected; the bottom end of the first channel is provided with a blocking structure, the blocking structure can slide off the blind plate component to block, and the blocking structure can also be broken to enable the blind plate component to be separated from the first channel.

In the above preferred technical solution of the drilling-free stage cementing device, the blocking structure is a stop pin disposed on an inner wall of the first passage.

In the above-mentioned preferred technical scheme who exempts from to bore stage cementing ware, the body is including top connection, first sleeve pipe, second sleeve pipe and the lower clutch that connects gradually, the circulation hole set up in first sleeve pipe, through-hole structure set up in the second sleeve pipe, first sliding sleeve with the second sliding sleeve passes through respectively first shearing pin with second shearing pin with first bushing, the blind plate component passes through fourth shearing pin with second bushing, the rubber sleeve cover is established on the sheathed tube lateral wall of second.

In the above-mentioned drilling-free stage cementing device according to the preferred embodiment, the blind member includes a first portion and a second portion, the first portion is located above the second portion, the first portion has an outer diameter larger than that of the second portion, and the first portion is connected to the body by the fourth shear pin.

In the above preferred embodiment of the drill-free stage cementing apparatus, the outer diameter of the top of the second portion is larger than the outer diameter of the bottom of the second portion.

In the above-mentioned preferred technical scheme who exempts from to bore stage cementing ware, the lower part of the inner wall of body is provided with first stair structure, be provided with second platform structure on the outer wall of first sliding sleeve, first stair structure with be formed with annular chamber between the second stair structure, still be provided with the intercommunicating pore on the lateral wall of body, the top of intercommunicating pore with annular chamber intercommunication, the bottom of intercommunicating pore with the bottom intercommunication of first passageway.

In the above-mentioned preferred technical scheme who exempts from to bore stage cementing ware, the upper end of blind plate component along extremely the position more than the bottom of second sliding sleeve, the lateral wall of blind plate component with the inside wall of first sliding sleeve with the inside wall of second sliding sleeve seals the butt.

In the above-mentioned preferred technical scheme of exempting from to bore stage cementing ware, the second shutoff component is the glueballs, the diameter of glueballs is less than the internal diameter of the top port of second passageway and is greater than the internal diameter of the bottom port of second passageway.

In the above preferred technical solution of the drilling-free stage cementing device, the first plugging member is a first rubber plug, and/or the second plugging member is a second rubber plug.

Under the condition of adopting the technical scheme, the drilling-free stage cementing device comprises a body, wherein a first channel is formed in the body, and a circulating hole is formed in the side wall of the body and is communicated with the first channel; the first sliding sleeve is positioned in the first channel, the first sliding sleeve is connected with the body through a first shearing pin, the outer side wall of the first sliding sleeve is in sealing butt joint with the inner side wall of the body, and the first sliding sleeve can move from a first position for closing the circulation hole to a second position for opening the circulation hole when the first shearing pin is disconnected; the second sliding sleeve is positioned in the first channel and above the first sliding sleeve, the second sliding sleeve is connected with the body through a second shearing pin, the outer side wall of the second sliding sleeve is in sealing butt joint with the inner side wall of the body, and the second sliding sleeve can slide along the first channel to close the circulating hole when the second shearing pin is disconnected; the rubber plug sleeve is positioned in the second sliding sleeve, the rubber plug sleeve is connected with the second sliding sleeve through a third shearing pin, and the outer side wall of the rubber plug sleeve is in sealing butt joint with the inner side wall of the second sliding sleeve; the first plugging member is an independent member and can be thrown into the rubber plug sleeve and plug a port of the rubber plug sleeve; the blind plate component is positioned in the first channel and is connected with the body through a fourth shear pin, the outer side wall of the blind plate component is in sealing butt joint with the inner side wall of the body, a second channel is formed in the blind plate component and is communicated with the first channel, and the inner diameter of a top port of the second channel is larger than that of a bottom port of the second channel; and a second blocking member that is an independent member and that can be thrown into the second channel and blocks the bottom port of the second channel. Through the arrangement, when the casing is laid down, the first plugging member and the second plugging member are not put in, so that the inside of the casing can be kept smooth, and the inside of the casing can be circulated; when the sleeve is lowered to the set position, the second plugging member is thrown into the second channel of the blind plate member, and the bottom port of the second channel is plugged, so that the pressure of liquid in the blind plate member can be guaranteed to be built, and in addition, the second channel is set to be in a form that the top port is large and the bottom port is small, so that the second plugging member is favorably thrown into the second channel.

Further, the blind member includes a first portion and a second portion, the first portion is located above the second portion, an outer diameter of the first portion is greater than an outer diameter of the second portion, and the first portion of the blind member is fixedly connected to the body by a fourth shear pin. Through such setting for certain clearance has between the inner wall of the first passageway of the second part of blind plate component and body, is favorable to the blind plate component landing downwards after the construction, in addition, because only the inner wall contact of the first passageway of the first part of blind plate component and body, promptly, reduced the area of contact between blind plate component and the body, thereby reduced the frictional force between blind plate component and the body, also be favorable to the blind plate component landing downwards.

Still further, be provided with first stair structure on the inner wall of body, the lower part of the outer wall of first sliding sleeve is provided with the second structure, is formed with annular cavity between first stair structure and the second stair structure, still is provided with the intercommunicating pore on the lateral wall of body, and the top of intercommunicating pore and annular cavity intercommunication, the bottom of intercommunicating pore and the bottom of first passageway intercommunication. With such an arrangement, it is facilitated to break the first shear pin between the first runner and the body by the built-up pressure in the pipe to cause the first runner to open the circulation hole.

Still further, the upper end of blind plate component is along the position more than to the bottom of second sliding sleeve, and the lateral wall of blind plate component seals the butt with the inside wall of first sliding sleeve and the inside wall of second sliding sleeve. Through such setting, can guarantee just open the circulation hole at the blind plate component seat back, first sliding sleeve avoids first sliding sleeve malfunction.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a first schematic structural view of the drill-free stage cementing apparatus of the present invention;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a second schematic structural view of the drill-free stage cementing apparatus of the present invention;

FIG. 4 is a schematic structural view of a first plugging member of the drill-free stage cementing apparatus of the present invention;

FIG. 5 is a schematic diagram of a first embodiment of a second plugging member of the drill-free stage cementing apparatus of the present invention;

FIG. 6 is a schematic structural view of a second embodiment of a second plugging member of the drill-free stage cementing apparatus of the present invention;

FIG. 7 is a third schematic structural view of the drill-free stage cementing apparatus of the present invention;

FIG. 8 is a fourth schematic structural view of the drill-free stage cementing apparatus of the present invention;

FIG. 9 is a fifth schematic structural view of the drill-free stage cementing apparatus of the present invention;

FIG. 10 is a sixth schematic structural view of the drill-free stage cementing apparatus of the present invention;

fig. 11 is a seventh structural schematic diagram of the drill-free stage cementing apparatus of the present invention.

List of reference numerals:

1. a body; 11. a first channel; 12. a circulation hole; 13. a via structure; 14. an upper joint; 15. a first sleeve; 16. a second sleeve; 17. a lower joint; 18. a stop pin; 19. a communicating hole; 2. a blind plate member; 21. a second channel; 22. a first portion; 23. a second portion; 31. a second rubber plug; 311. a cylindrical body; 312. an annular projection; 32. rubber balls; 4. a first sliding sleeve; 5. a second sliding sleeve; 6. a rubber plug sleeve; 7. a first rubber plug; 81. a first shear pin; 82. a second shear pin; 83. a third shear pin; 84. a fourth shear pin; 9. a rubber sleeve; 10. an annular chamber.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The casing of the existing stage cementing device pointed out based on the background technology is plugged by a blind plate, so that the circulation in the casing cannot be realized, and the problem of possibly influencing the well cementation quality is solved. The invention provides a drilling-free stage cementing device, aiming at keeping a sleeve in a smooth state and enabling the sleeve to be circulated.

Referring first to fig. 1 to 6, wherein fig. 1 is a first structural schematic diagram of the drill-free stage cementing apparatus of the present invention; FIG. 2 is an enlarged partial schematic view of FIG. 1; FIG. 2 is a second schematic structural view of the drill-free stage cementing apparatus of the present invention; FIG. 4 is a schematic structural view of a first plugging member of the drill-free stage cementing apparatus of the present invention; FIG. 5 is a schematic diagram of a first embodiment of a second plugging member of the drill-free stage cementing apparatus of the present invention; fig. 6 is a schematic structural view of a second embodiment of the second plugging member of the drill-free stage cementing apparatus of the present invention.

As shown in fig. 1 to 6, the drilling-free stage cementing device of the present invention comprises a body 1, a first sliding sleeve 4, a second sliding sleeve 5, a rubber plug sleeve 6, a blind plate member 2, a first blocking member and a second blocking member, wherein a first channel 11 is formed in the body 1, a circulation hole 12 is further provided on a side wall of the body 1, and the circulation hole 12 is communicated with the first channel 11.

With continued reference to fig. 1 and 2, the first sliding sleeve 4 and the second sliding sleeve 5 are both located in the first passage 11, the outer side wall of the first sliding sleeve 4 and the outer side wall of the second sliding sleeve 5 are both in sealing abutment with the inner side wall of the body 1, and the second sliding sleeve 5 is located above the first sliding sleeve 4, wherein the first sliding sleeve 4 is connected with the body 1 through a first shear pin 81, the second sliding sleeve 5 is connected with the body 1 through a second shear pin 82, the first sliding sleeve 4 can move downwards from a first position closing the circulation hole 12 to a second position opening the circulation hole 12 along the first passage 11 when the first shear pin 81 is disconnected, and the second sliding sleeve 5 can slide along the first passage 11 to close the circulation hole 12 when the second shear pin 82 is disconnected.

Preferably, as shown in fig. 3, a first step structure is provided on the inner wall of the body 1, a second step structure is provided on the lower portion of the outer wall of the first sliding sleeve 4, an annular chamber 10 is formed between the first step structure and the second step structure, a communication hole 19 is further provided on the side wall of the body 1, the top end of the communication hole 19 communicates with the annular chamber 10, and the bottom end of the communication hole 19 communicates with the bottom end of the first channel 11.

In this way, when the pressure in the pipe is built up above the first sliding sleeve 4, the first shear pin 81 between the first sliding sleeve 4 and the body 1 can be broken by the pressure difference formed between the pressure above and the pressure below the first sliding sleeve 4, so that the first sliding sleeve 4 moves downward to open the circulation hole 12.

It should be noted that the first step structure and the second step structure can also cooperate with each other, as shown in fig. 8, the first sliding sleeve 4 is prevented from moving downwards continuously, so as to limit the first sliding sleeve 4 at the second position, when the second sliding sleeve 5 slides downwards, as shown in fig. 9, the bottom end of the second sliding sleeve 5 abuts against the top end of the first sliding sleeve 4, so as to prevent the second sliding sleeve 5 from sliding downwards continuously, so as to limit the second sliding sleeve 5 at the position for closing the circulation hole 12.

Continuing to refer to fig. 1, 2 and 4, the rubber plug sleeve 6 is located in the second sliding sleeve 5, the outer side wall of the rubber plug sleeve 6 is in sealing abutment with the inner side wall of the second sliding sleeve 5, and the rubber plug sleeve 6 is connected with the second sliding sleeve 5 through a third shear pin 83; first shutoff component is independent component, and first shutoff component uses with the cooperation of plug cover 6, and first shutoff component can be thrown into in the plug cover 6 and with the port shutoff of plug cover 6.

It should be noted that, the first blocking member may be configured as a rubber plug or a rubber ball, and those skilled in the art may flexibly configure the specific structure of the first blocking member in practical application, as long as the first blocking member can block the port of the rubber plug sleeve 6.

Preferably, as shown in fig. 4, the first plugging member is provided as a rubber plug, denoted as first rubber plug 7. In operation, the end of the rubber plug sleeve 6 can be plugged by the first rubber plug 7.

With continued reference to fig. 1, 2, 5 and 6, the blind plate member 2 is located in the first channel 11, the blind plate member 2 is connected to the body 1 through a fourth shear pin 84, the outer side wall of the blind plate member 2 is in sealing abutment with the inner side wall of the body 1, a second channel 21 is formed in the blind plate member 2, the second channel 21 is communicated with the first channel 11, and the inner diameter of the top port of the second channel 21 is larger than the inner diameter of the bottom port of the second channel 21; the second blocking member is an independent member, and is used in cooperation with the blind plate member 2, and can be put into the second passage 21 to block the bottom port of the second passage 21.

Before casing is put in, the first plugging member and the second plugging member are not put in, so that the inside of the casing can be kept smooth, the inside of the casing can be circulated, when the casing is put down to a set position, the second plugging member is put into the second channel 21 of the blind plate member 2, and a bottom port of the second channel 21 is plugged, so that the pressure of liquid in the pipe above the blind plate member 2 can be ensured to be established.

It should be noted that, in practical applications, a person skilled in the art may flexibly set a specific structural form of the second blocking member, for example, the second blocking member may be set as a rubber plug, a rubber ball, a cylindrical structure, a conical structure, a frustum structure, etc., as long as the bottom port of the second channel 21 of the blind plate member 2 can be blocked by the second blocking member.

In a preferred case, as shown in fig. 5, the second plugging member is provided as a rubber plug, denoted as second rubber plug 31. In operation, the bottom port of the blind plate member 2 is plugged by the second rubber plug 31.

Exemplarily, as shown in fig. 5, the second rubber plug 31 has a cylindrical body 311, a plurality of annular protrusions 312 are disposed on the cylindrical body 311, the plurality of annular protrusions 312 are distributed along the length direction of the cylindrical body 311, and when the second rubber plug 31 is thrown into the second channel 21, the bottom port of the second channel 21 can be blocked.

In another preferable case, as shown in fig. 6, the second blocking member is provided as a rubber ball 32, the diameter of the rubber ball 32 is smaller than the inner diameter of the top port of the second passage 21, and the diameter of the rubber ball 32 is larger than the inner diameter of the bottom port of the second passage 21, so that the bottom port of the second passage 21 can be blocked after the rubber ball 32 is thrown into the second passage 21.

In a further preferred case, the number of second plugging members is two, wherein one second plugging member is provided as a second rubber plug 31 and the other second plugging member is provided as a rubber ball 32.

Preferably, as shown in fig. 1 to 3, the upper end of the blind member 2 is along a position above the bottom end of the second runner 5, and the outer side wall of the blind member 2 is in sealing abutment with the inner side wall of the first runner 4 and the inner side wall of the second runner 5.

Through the arrangement, the gap between the first sliding sleeve 4 and the second sliding sleeve 5 can be sealed through the blind plate component 2, and the first sliding sleeve 4 is prevented from opening the circulating hole 12 in advance.

Specifically, in order to break the fourth shear pin 84 between the blind plate member 2 and the body 1, in the process of building pressure in the pipe, the blind plate member 2 seals the gap between the first sliding sleeve 4 and the second sliding sleeve 5, and the pressure in the pipe is not transmitted to the first sliding sleeve 4, so that the first sliding sleeve 4 can be prevented from misoperation, and the first sliding sleeve 4 is allowed to operate only after the blind plate member 2 moves downwards when the fourth shear pin 84 breaks.

Preferably, as shown in fig. 1 and 2, the drill-free stage cementing device of the present invention further comprises a rubber sleeve 9, which is sleeved on the outer sidewall of the body 1, the body 1 is provided with a through hole structure 13 at a position corresponding to the rubber sleeve 9, the through hole structure 13 is communicated with the first channel 11, the blind plate member 2 can move downwards from a first position closing the through hole structure 13 to a second position opening the through hole structure 13 when the fourth shear pin 84 is disconnected; the bottom end of the first channel 11 is provided with a blocking structure, the blocking structure can block the blind plate member 2 which slides down, and the blocking structure can also be broken to enable the blind plate member 2 to be separated from the first channel 11.

It should be noted that the blocking structure can be configured as a blocking ring, a stop pin, etc., and such modifications and changes to the specific structural form of the blocking structure do not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

Preferably, as shown in fig. 1, the blocking structure is a catch pin 18 provided on the inner wall of the first channel 11.

It should be noted that the number of the stop pins 18 may be one, two or more, and that such adjustment and change to the specific number of the stop pins 18 are not departing from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

Preferably, as shown in fig. 1 to 3, the body 1 includes an upper joint 14, a first sleeve 15, a second sleeve 16 and a lower joint 17 which are connected in sequence, the circulation hole 12 is arranged in the first sleeve 15, the through hole structure 13 is arranged in the second sleeve 16, the first sliding sleeve 4 and the second sliding sleeve 5 are respectively connected with the first sleeve 15 through a first shear pin 81 and a second shear pin 82, the blind plate member 2 is connected with the second sleeve 16 through a fourth shear pin 84, and the rubber sleeve 9 is sleeved on the outer side wall of the second sleeve 16.

Wherein, the sealed butt of the lateral wall of first sliding sleeve 4 and second sliding sleeve 5 and the inside wall of first sleeve 15, first stair structure set up on the inside wall of first sleeve 15, and intercommunicating pore 19 extends downwards along first sleeve 15, second sleeve 16 and lower clutch 17, and the bottom of intercommunicating pore 19 is close to the setting of backing pin 18.

It should be noted that the upper joint 14, the first sleeve 15, the second sleeve 16 and the lower joint 17 are preferably fixedly connected by a thread structure.

Preferably, as shown in fig. 1 and 2, the blind member 2 of the present invention comprises a first portion 22 and a second portion 23, the first portion 22 is located above the second portion 23, an outer side wall of the first portion 22 is in sealing abutment with an inner side wall of the body 1, an outer diameter of the first portion 22 is larger than an outer diameter of the second portion 23, and the first portion 22 of the blind member 2 is fixedly connected with the body 1 by a fourth shear pin.

In this way, a certain gap is formed between the second part 23 of the blind plate member 2 and the inner wall of the first channel 11 of the body 1, which is beneficial for the blind plate member 2 to slide downwards, and in addition, only the first part 22 of the blind plate member 2 is in contact with the inner wall of the first channel 11 of the body 1, namely, the contact area between the blind plate member 2 and the body 1 is reduced, so that the friction force between the blind plate member 2 and the body 1 is reduced, and the blind plate member 2 is also beneficial for the blind plate member 2 to slide downwards.

Preferably, as shown in fig. 1 and 2, the outer diameter of the top of the second portion 23 of the blind member 2 is larger than the outer diameter of the bottom of the second portion 23.

It should be noted that, in practical applications, the outer diameter of the second portion 23 of the blind member 2 may be smoothly tapered from the top of the second portion 23 to the bottom of the second portion 23, or the outer diameter of the second portion 23 of the blind member 2 may be tapered from the top of the second portion 23 to the bottom of the second portion 23, and so on, and such flexible adjustment and change do not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

Preferably, as shown in fig. 1 and 2, the outer diameter of the second portion 23 of the blind member 2 is smoothly tapered from the top of the second portion 23 toward the bottom of the second portion 23.

The working of the stage cementing according to the present invention is described below with reference to fig. 7 to 11:

after the casing pipe is lowered to the set position, the second rubber plug 31 (or the rubber ball 32) is put into the casing pipe, the second rubber plug 31 slides down into the second channel 21 of the blind plate member 2, the bottom port of the second channel 21 is blocked, the pressure in the casing pipe begins to be suppressed, when the pressure in the casing pipe reaches the fourth set pressure, the pressure is transmitted to the fourth shearing pin 84 from the blind plate member 2, the fourth shearing pin 84 is broken, as shown in fig. 7, the blind plate member 2 and the second rubber plug 31 slide down along the first channel 11 together, the through hole structure 13 arranged on the second casing pipe 16 is opened, the blind plate member 2 and the second rubber plug 31 slide down to the bottom end of the first channel 11 together and are blocked by the blocking pin 18, and the sliding is stopped.

The liquid in the first channel 11 enters the cavity between the second sleeve 16 and the rubber sleeve 9 through the through hole structure 13 on the second sleeve 16, so that the rubber sleeve 9 bulges outwards to complete the setting of the rubber sleeve 9.

And the pressure in the sleeve is continuously improved, when the pressure in the sleeve reaches a first set pressure, the first shearing pin 81 is broken under the action of the pressure difference between the pressure above the first sliding sleeve 4 and the pressure below the first sliding sleeve 4, as shown in fig. 8, the first sliding sleeve 4 slides to a second position from a first position, the circulating hole 12 arranged on the first sleeve 15 is exposed, the opening of the stage cementing device is completed, and the secondary cementing operation is carried out.

After cement is injected, the first rubber plug 7 is put into the sleeve, the first rubber plug 7 slides down to the rubber plug sleeve 6, the port of the rubber plug sleeve 6 is blocked, pressure continues to be suppressed, when the pressure in the sleeve reaches the second set pressure, the pressure is transmitted to the second sliding sleeve 5 by the rubber plug sleeve 6, and then is transmitted to the second shearing pin 82 by the second sliding sleeve 5, the second shearing pin 82 is broken, as shown in fig. 9, the second sliding sleeve 5 slides down along the first channel 11, the circulation hole 12 in the first sleeve 15 is closed again, and the closing of the grading cement injector is completed.

The pressure in the sleeve is continuously increased, when the pressure in the sleeve reaches a third set pressure, the pressure is transmitted to the third shearing pin 83 by the rubber plug sleeve 6, the third shearing pin 83 is broken, as shown in fig. 10, the first rubber plug 7 and the rubber plug sleeve 6 slide downwards along the first channel 11 together, and the first rubber plug 7 and the rubber plug sleeve 6 are blocked when sliding downwards to the position above the blind plate member 2 together, and stop sliding downwards.

The pressure in the sleeve is continuously improved, when the pressure in the sleeve reaches the fifth set pressure, the pressure is transmitted to the blind plate member 2 through the rubber plug sleeve 6, and then is transmitted to the stop pin 18 through the blind plate member 2, and the stop pin 18 is broken, as shown in fig. 11, the first rubber plug 7, the rubber plug sleeve 6, the blind plate member 2 and the second rubber plug 31 slide out from the first channel 11 together, the through diameter in the sleeve is ensured, no blocking object exists in the cement injector, the graded cement injection is completed, the plug drilling is not needed, and the follow-up operation can be directly carried out.

In conclusion, the drilling-free stage cementing of the invention comprises all functions of a differential pressure type stage hoop, a packer and a recyclable drilling-free blind plate, and the action of the packer and the action of the blind plate are interlocked, so that the packer can act only after the blind plate is seated, thereby preventing the misoperation of the packer.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. The utility model provides an exempt from to bore stage cementing ware which characterized in that, exempt from to bore stage cementing ware includes:

the device comprises a body, a first channel and a second channel, wherein the first channel is formed in the body, a circulating hole is formed in the side wall of the body, and the circulating hole is communicated with the first channel;

a first runner located within the first channel, the first runner being connected to the body by a first shear pin, an outer sidewall of the first runner being in sealing abutment with an inner sidewall of the body, the first runner being movable along the first channel from a first position closing the circulation hole to a second position opening the circulation hole when the first shear pin is disconnected;

the second sliding sleeve is positioned in the first channel and above the first sliding sleeve, the second sliding sleeve is connected with the body through a second shearing pin, the outer side wall of the second sliding sleeve is in sealing butt joint with the inner side wall of the body, and the second sliding sleeve can slide along the first channel to close the circulating hole when the second shearing pin is disconnected;

the rubber plug sleeve is positioned in the second sliding sleeve, the rubber plug sleeve is connected with the second sliding sleeve through a third shearing pin, and the outer side wall of the rubber plug sleeve is in sealing butt joint with the inner side wall of the second sliding sleeve;

a first plugging member which is an independent member and can be thrown into the rubber plug sleeve and plug a port of the rubber plug sleeve;

the blind plate component is positioned in the first channel and is connected with the body through a fourth shear pin, the outer side wall of the blind plate component is in sealing butt joint with the inner side wall of the body, a second channel is formed in the blind plate component and is communicated with the first channel, and the inner diameter of a top port of the second channel is larger than that of a bottom port of the second channel; and

a second blocking member that is a separate member and that can be thrown into the second channel and blocks the bottom port of the second channel.

2. The drill-free stage cementing device according to claim 1, further comprising a rubber sleeve fitted over an outer sidewall of said body, said body being provided with a through hole structure at a position corresponding to said rubber sleeve, said through hole structure being in communication with said first channel, said blind member being movable from a first position closing said through hole structure to a second position opening said through hole structure upon disconnection of said fourth shear pin; the bottom end of the first channel is provided with a blocking structure, the blocking structure can block the sliding blind plate component, and the blocking structure can also be broken to enable the blind plate component to be separated from the first channel.

3. The drill-free stage cementing according to claim 2, wherein said blocking structure is a stop pin provided on the inner wall of said first channel.

4. The drilling-free stage cementing device according to claim 2, wherein the body comprises an upper joint, a first sleeve, a second sleeve and a lower joint which are connected in sequence, the circulation hole is arranged in the first sleeve, the through hole structure is arranged in the second sleeve, the first sliding sleeve and the second sliding sleeve are respectively connected with the first sleeve through the first shearing pin and the second shearing pin, the blind plate member is connected with the second sleeve through the fourth shearing pin, and the rubber sleeve is sleeved on the outer side wall of the second sleeve.

5. The drill-free stage cementing according to claim 1, wherein the blind member comprises a first portion and a second portion, the first portion being located above the second portion, an outer sidewall of the first portion being in sealing abutment with an inner sidewall of the body, an outer diameter of the first portion being greater than an outer diameter of the second portion, the first portion being connected with the body by the fourth shear pin.

6. The drill-free stage cementing according to claim 5, wherein the top of said second part has an outer diameter larger than the outer diameter of the bottom of said second part.

7. The drilling-free stage cementing device according to claim 1, wherein a first step structure is arranged on the inner side wall of the body, a second step structure is arranged at the lower part of the outer side wall of the first sliding sleeve, an annular chamber is formed between the first step structure and the second step structure, a communication hole is further arranged on the side wall of the body, the top end of the communication hole is communicated with the annular chamber, and the bottom end of the communication hole is communicated with the bottom end of the first channel.

8. The drill-free stage cementing apparatus according to claim 7, wherein the upper end of said blind member is along a position above the bottom end of said second sliding sleeve, the outer sidewall of said blind member sealingly abutting the inner sidewalls of said first sliding sleeve and said second sliding sleeve.

9. The drill-free stage cementing according to any one of the claims 1 to 7, wherein said second blocking member is a glue ball having a diameter smaller than the inner diameter of the top port of the second channel and larger than the inner diameter of the bottom port of the second channel.

10. The drill-free stage cementing apparatus according to any one of the claims 1 to 7, wherein the first blocking member is a first rubber plug and/or wherein the first blocking member is a second rubber plug

The second plugging member is a second rubber plug.