阅读说明：本技术 一种滑套工具的高压激活导压机构及使用方法 (High-pressure activation pressure guide mechanism of sliding sleeve tool and use method ) 是由 隆世明 苏敏文 邓小强 张文 李景彬 田文超 廖作杰 李星星 晏健 王伟鹏 侯俊 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种滑套工具的高压激活导压机构及使用方法,包括阀体和控压柱塞,阀体内开有安装空腔,安装空腔内连接有缓冲套,缓冲套上连接有弹簧轴,弹簧轴外围套有碟形弹簧,缓冲套下方连接有柱塞阀座,所述柱塞阀座中心开有控压柱塞孔,控压柱塞前端从控压柱塞孔插入并顶在弹簧轴后端,安装空腔开有与外界连通的导通孔,缓冲套为凹字形结构。通过固井时井口的高压来分离第二控压柱塞柱和第三控压柱塞环,同时还保持安装空腔内的密封。等到固井结束压力降低后,依靠蝶形弹簧自身的能量将控压柱塞从控压柱塞孔中推走,连通井筒与安装空腔,从而提高安装空腔内的压力。(The invention discloses a high-pressure activation pressure guide mechanism of a sliding sleeve tool and a use method thereof, and the high-pressure activation pressure guide mechanism comprises a valve body and a pressure control plunger, wherein an installation cavity is formed in the valve body, a buffer sleeve is connected in the installation cavity, a spring shaft is connected on the buffer sleeve, a disc spring is sleeved on the periphery of the spring shaft, a plunger valve seat is connected below the buffer sleeve, a pressure control plunger hole is formed in the center of the plunger valve seat, the front end of the pressure control plunger is inserted into the pressure control plunger hole and abuts against the rear end of the spring shaft, a through hole communicated with the outside is formed in the installation cavity, and the buffer. The second and third pressure control plunger plugs are separated by the high pressure of the wellhead during cementing while maintaining the seal within the installation cavity. After the pressure is reduced after the well cementation is finished, the pressure control plunger is pushed away from the pressure control plunger hole by means of the energy of the belleville spring, the shaft is communicated with the installation cavity, and therefore the pressure in the installation cavity is improved.)

1. A high pressure activation pressure guide mechanism of a sliding sleeve tool is characterized in that: including valve body (1) and accuse pressure plunger (5), seted up in valve body (1) and had the installation cavity, installation cavity in-connection has buffer housing (2), is connected with spring axle (4) on buffer housing (2), and the peripheral cover of spring axle (4) has belleville spring (3), and buffer housing (2) below is connected with plunger disk seat (7), plunger disk seat (7) center is opened and is had the accuse and press the plunger hole, and accuse pressure plunger (5) front end is followed the accuse and is pressed the plunger hole and insert and push up at spring axle (4) rear end, and installation cavity opens has conducting hole (11) with external intercommunication, and buffer housing (2) are character cut in bas-relief structure, and the opening is towards conducting hole (11), and spring axle (4), plunger disk seat (7), accuse pressure plunger (5) and accuse press the plunger hole center all to be located a straight line with conducting hole (11).

2. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 1, wherein: buffer sleeve (2) are concave, and the opening is to conducting hole (11), and buffer sleeve (2) pass through threaded connection with the installation cavity, still are connected with the sealing washer between buffer sleeve (2) outer wall and the installation cavity inner wall.

3. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 1, wherein: the spring shaft (4) is T-shaped, the narrower end of the spring shaft (4) is connected to the buffer sleeve (2), the upper end of the disc spring (3) is propped against the wider end of the spring shaft (4), and the lower end of the disc spring is propped against the buffer sleeve (2).

4. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 1, wherein: and a sealing ring is connected between the outer wall of the plunger valve seat (7) and the inner wall of the mounting cavity.

5. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 1, wherein: the pressure control plunger hole gradually reduces in width from the conducting hole (11) to the buffer sleeve (2) and is divided into a first stage, a second stage and a third stage, the pressure control plunger (5) is divided into a first pressure control plunger (5-1), a second pressure control plunger (5-2) and a third pressure control plunger ring (5-3), the width of the first pressure control plunger is gradually increased, the second pressure control plunger (5-2) is connected to the lower end of the first pressure control plunger (5-1), the third pressure control plunger ring (5-3) is sleeved outside the second pressure control plunger (5-2), the third pressure control plunger ring (5-3) and the second pressure control plunger (5-2) are located in the third stage, the first pressure control plunger (5-1) penetrates through the first stage and the second stage to abut against the spring shaft (4), and the width of the third pressure control plunger ring (5-3) is equal to the width of the third stage, the width of the second pressure control plunger (5-2) is larger than the width of the first stage and smaller than the width of the second stage, and the width of the first pressure control plunger (5-1) is equal to the width of the first stage.

6. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 5, wherein: and a sealing ring is connected between the outer wall of the first pressure control plunger (5-1) and the inner wall of the first stage of the pressure control plunger hole.

7. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 5, wherein: a shear pin (16) is inserted in the third pressure control plunger ring (5-3), and the shear pin (16) is inserted in the second pressure control plunger (5-2).

8. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 5, wherein: the second pressure control plunger (5-2) and the third pressure control plunger ring (5-3) are integrally formed, but a shear stress groove (17) is formed at the joint.

9. The high pressure activated pressure guiding mechanism of a sliding sleeve tool as claimed in claim 5, wherein: the width of the second pressure control plunger (5-2) is smaller than or equal to that of the through hole (11), and the width of the third pressure control plunger ring (5-3) is larger than that of the through hole (11).

10. A method for using a high-pressure activation pressure guide mechanism of a sliding sleeve tool is characterized in that: when well cementation is pressurized, the pressure in the shaft extrudes a second pressure control plunger column (5-2) and a third pressure control plunger ring (5-3) of the pressure control plunger (5) to move towards the outer side of the shaft until the pressure in the shaft is larger than the sum of the pretightening force of the belleville spring (3) and the shearing force of the shearing stress groove (17), the second pressure control plunger column (5-2) and the third pressure control plunger ring (5-3) are separated along the shearing stress groove (17), the second pressure control plunger column (5-2) moves towards the spring shaft (4) and extrudes the belleville spring (3), then the second pressure control plunger column (5-2) is clamped by the pressure control plunger hole in a second stage, the first pressure control plunger column (5-1) is still blocked in the first stage, and the shaft is kept isolated from the installation cavity; after the pressure of the wellhead is relieved, the second pressure control plunger (5-2) receives pressure reduction from the shaft, when the pressure of the shaft is lower than the elastic force of the belleville spring (3), the belleville spring (3) pushes the first pressure control plunger (5-1) and the second pressure control plunger (5-2) to pop out from the through hole (11), the first stage of the pressure control plunger hole is not blocked by the first pressure control plunger (5-1), the shaft is communicated with the installation cavity in pressure, and the pressure in the installation cavity is changed.

Technical Field

The invention belongs to the field of oil and gas field development, and particularly relates to a high-pressure activation pressure guide mechanism of a sliding sleeve tool and a use method of the high-pressure activation pressure guide mechanism.

Background

The more well cementation sliding sleeve tools are applied to the development process of the horizontal well of the oil and gas field, particularly the toe end sliding sleeve tools. However, the need to perform casing strength pressure testing operations prior to new well operations is inconsistent with the performance of such tools. The invention relates to a high-pressure activation starting mechanism for a well cementation sliding sleeve tool, which can meet the requirement of casing strength pressure test.

Disclosure of Invention

The invention aims to provide a high-pressure activation pressure guide mechanism of a sliding sleeve tool and a using method thereof, so as to realize the function of applying high pressure to activate a pressure guide channel mechanism at a wellhead, opening the pressure guide channel by means of the self energy of the mechanism after the wellhead is decompressed, and realizing the pressure communication between the shaft pressure and specific mechanisms of well cementation sliding sleeve tools such as a casing sliding sleeve, a toe end sliding sleeve and the like.

The object of the invention is achieved by the following technical means,

the utility model provides a pressure mechanism is led in high pressure activation of sliding sleeve instrument, includes valve body and accuse pressure plunger, opens there is the installation cavity in the valve body, and installation cavity in-connection has the cushion collar, is connected with the spring axle on the cushion collar, and the peripheral cover of spring axle has disk spring, and the cushion collar below is connected with the plunger disk seat, open at plunger disk seat center has accuse pressure plunger hole, and accuse pressure plunger front end inserts and pushes up at spring axle rear end from accuse pressure plunger hole, and installation cavity opens has the conducting hole with external intercommunication, and the cushion collar is the font structure, and the opening is towards the conducting hole, and spring axle, plunger disk seat, accuse pressure plunger and accuse pressure plunger hole center all lie in a straight line with the conducting hole.

The buffer sleeve is concave, the opening faces the via hole, the buffer sleeve is in threaded connection with the installation cavity, and a sealing ring is connected between the outer wall of the buffer sleeve and the inner wall of the installation cavity.

The spring shaft is T-shaped, the narrower end of the spring shaft is connected to the buffer sleeve, the upper end of the disc spring is propped against the wider end of the spring shaft, and the lower end of the disc spring is propped against the buffer sleeve.

And a sealing ring is connected between the outer wall of the plunger valve seat and the inner wall of the installation cavity.

The pressure control plunger hole is gradually reduced in width from the conducting hole to the buffer sleeve and is divided into a first stage, a second stage and a third stage, the pressure control plunger is divided into a first pressure control plunger, a second pressure control plunger and a third pressure control plunger ring, the width of the first pressure control plunger is gradually increased, the second pressure control plunger is connected to the lower end of the first pressure control plunger, the third pressure control plunger ring is sleeved outside the second pressure control plunger, the third pressure control plunger ring and the second pressure control plunger are located in the third stage, the first pressure control plunger penetrates through the first stage and the second stage until the first pressure control plunger abuts against the spring shaft, the width of the third pressure control plunger ring is equal to the width of the third stage, the width of the second pressure control plunger is larger than the width of the first stage and smaller than the width of the second stage, and the width of the first pressure control plunger is equal to the width of the first stage.

And a sealing ring is connected between the outer wall of the first pressure control plunger column and the inner wall of the first stage of the pressure control plunger hole.

And a shear pin is inserted in the third pressure control plunger ring and is inserted in the second pressure control plunger.

The second pressure control plunger piston and the third pressure control plunger piston ring are integrally formed, but a shear stress groove is formed at the joint.

The width of the second pressure control plunger is smaller than or equal to that of the conducting hole, and the width of the third pressure control plunger ring is larger than that of the conducting hole.

A method for using a high-pressure activation pressure guide mechanism of a sliding sleeve tool is characterized in that when a well is cemented and pressurized, pressure in a shaft extrudes a second pressure control plunger column and a third pressure control plunger ring of a pressure control plunger to move towards the outer side of the shaft until the pressure in the shaft is larger than the sum of the pretightening force of a belleville spring and the shearing force of a shearing stress groove, the second pressure control plunger column and the third pressure control plunger ring are separated along the shearing stress groove, the second pressure control plunger column moves towards the axial direction of a spring and extrudes the belleville spring, then the second pressure control plunger column is clamped by a second stage of a pressure control plunger hole, the first pressure control plunger column is still blocked in the first stage, and the shaft is kept isolated from an installation cavity; after the pressure of the wellhead is relieved, the pressure of the second pressure control plunger column from the shaft is reduced, when the pressure of the shaft is lower than the elastic force of the belleville spring, the belleville spring pushes the first pressure control plunger column and the second pressure control plunger column to be ejected out from the via hole, the first stage of the pressure control plunger hole is not blocked by the first pressure control plunger column any more, the shaft is communicated with the installation cavity in pressure, and the pressure in the installation cavity is changed.

The invention has the beneficial effects that: the second and third pressure control plunger plugs are separated by the high pressure of the wellhead during cementing while maintaining the seal within the installation cavity. After the pressure is reduced after the well cementation is finished, the pressure control plunger is pushed away from the pressure control plunger hole by means of the energy of the belleville spring, the shaft and the installation cavity are communicated, and therefore the pressure in the installation cavity is improved, subsequent tools such as an underground casing sliding sleeve and a toe end sliding sleeve are affected, and the purpose that the pressure build-up opening in the casing is fused with the casing strength pressure test operation of a new well is achieved.

Drawings

FIG. 1 is a schematic structural view of a high-pressure activated pressure guide mechanism of a well cementing sliding sleeve tool;

FIG. 2 is a schematic structural view of a high-pressure activated pressure guide mechanism of the well cementing sliding sleeve tool during high-pressure activation;

FIG. 3 is a schematic view of a pressure control plunger;

FIG. 4 is another schematic view of the pressure control plunger;

FIG. 5 is a schematic structural view of a high-pressure activated pressure guide mechanism of a well cementing sliding sleeve tool when pressure relief is opened;

FIG. 1, valve body; 2. a buffer sleeve; 3. a belleville spring; 4. a spring shaft; 5. controlling the pressure of the plunger; 5-1, a first pressure control plunger; 5-2, a second pressure control plunger; 5-3, a third control pressure plunger ring; 7. a plunger valve seat; 11. a via hole; 16. shearing the pin; 17. a shear stress groove.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

[ example 1 ]

As shown in fig. 1, a high-pressure activation pressure guide mechanism of a sliding sleeve tool comprises an upper joint and a pressure control plunger 5, wherein an installation cavity is formed in the upper joint, a buffer sleeve 2 is connected in the installation cavity, a spring shaft 4 is connected on the buffer sleeve 2, a disc spring 3 is sleeved on the periphery of the spring shaft 4, a plunger valve seat 7 is connected below the buffer sleeve 2, a pressure control plunger hole is formed in the center of the plunger valve seat 7, the front end of the pressure control plunger 5 is inserted into the pressure control plunger hole and abuts against the rear end of the spring shaft 4, a through hole 11 communicated with the outside is formed in the installation cavity, the buffer sleeve 2 is of a concave structure, the opening faces the through hole 11, and the centers of the spring shaft 4, the plunger valve seat 7, the pressure control plunger 5 and the pressure control plunger hole are all located on the same straight line.

Whole top connection is in the below of pit shaft, and the buffer housing 2 of character cut in bas-relief connects on the installation cavity inner wall of via hole 11 offside, and the opening of buffer housing 2 is directly to via hole 11, and spring shaft 4 is connected on buffer housing 2, and is facing to via hole 11. The outer side of the spring shaft 4 is connected with a belleville spring 3. The through hole 11 and the plunger valve seat hole are communicated with a cavity formed by the shaft and the opening of the buffer sleeve 2.

As shown in fig. 1, a plunger valve seat 7 is connected below the buffer sleeve 2, and the plunger valve seat 7 blocks the opening of the buffer sleeve 2 to separate the cavity in the opening of the buffer sleeve 2 from the shaft.

The center of the plunger valve column 7 is provided with a through hole 11, a pressure control plunger 5 is inserted into the through hole 11 to block the through hole 11, and the pressure control plunger 5 penetrates through the through hole 11 and is pressed against the spring shaft 4.

Buffer sleeve 2 is concave font, and the opening is to conducting hole 11, and buffer sleeve 2 passes through threaded connection with the installation cavity, still is connected with the sealing washer between 2 outer walls of buffer sleeve and the installation cavity inner wall.

The outer wall of the buffer sleeve 2 is in threaded connection with the installation cavity, and a sealing ring is arranged between the outer wall of the buffer sleeve 2 and the installation cavity for sealing.

Buffer sleeve 2 is concave font, and the opening is to conducting hole 11, and buffer sleeve 2 passes through threaded connection with the installation cavity, still is connected with the sealing washer between 2 outer walls of buffer sleeve and the installation cavity inner wall.

The outer wall of the buffer sleeve 2 is in threaded connection with the installation cavity, and a sealing ring is arranged between the outer wall of the buffer sleeve 2 and the installation cavity for sealing.

The spring shaft 4 is T-shaped, the narrower end, namely the upper end in figure 3, is connected with the buffer sleeve 2, the wider end is downward, and the belleville spring 3 is arranged between the wider end of the spring shaft 4 and the buffer sleeve 2.

The spring shaft 4 is T-shaped, the narrower end of the spring shaft 4 is connected to the buffer sleeve 2, the upper end of the disc spring 3 is propped against the wider end of the spring shaft 4, and the lower end of the disc spring is propped against the buffer sleeve 2.

And a sealing ring is connected between the outer wall of the plunger valve seat 7 and the inner wall of the installation cavity. For sealing the mounting cavity.

[ example 2 ]

On the basis of embodiment 1, as shown in fig. 1, 2 and 5, the width of the pressure control plunger hole gradually decreases from the via hole 11 to the buffer sleeve 2, and the pressure control plunger hole is divided into a first stage, a second stage and a third stage, the width of the pressure control plunger hole gradually increases, the first stage, the second stage and the third stage are respectively provided, the second pressure control plunger 5 is divided into a first pressure control plunger 5-1, a second pressure control plunger 5-2 and a third pressure control plunger ring 5-3, the second pressure control plunger 5-2 is connected to the lower end of the first pressure control plunger 5-1, the third pressure control plunger ring 5-3 is sleeved outside the second pressure control plunger 5-2, the third pressure control plunger ring 5-3 and the second pressure control plunger 5-2 are located in the third stage, the first pressure control plunger 5-1 penetrates through the first stage and the second stage until the first pressure control plunger ring 5-3 abuts against the spring shaft 4, the width of the third pressure control plunger ring 5-3 is equal to the width of the third stage, the width of the second pressure control plunger 5-2 is larger than the width of the first stage and smaller than the width of the second stage, and the width of the first pressure control plunger 5-1 is equal to the width of the first stage.

And a sealing ring is connected between the outer wall of the first pressure control plunger 5-1 and the inner wall of the first stage of the pressure control plunger hole.

A shear pin 16 is inserted in the third pressure control plunger ring 5-3, and the shear pin 16 is inserted in the second pressure control plunger 5-2.

The second pressure control plunger 5-2 and the third pressure control plunger ring 5-3 are integrally formed, but a shear stress groove 17 is formed at the joint.

The width of the second pressure control plunger 5-2 is smaller than or equal to the width of the via hole 11, and the width of the third pressure control plunger ring 5-3 is larger than the width of the via hole 11.

The diameter of the pressure control plunger hole is gradually reduced from the shaft to the installation cavity, and the pressure control plunger hole is divided into a third stage, a second stage and a third stage in sequence.

The pressure control plunger 5 is also divided into three parts, namely a third pressure control plunger ring 5-3, a second pressure control plunger 5-2 and a first pressure control plunger 5-1 which are gradually reduced, wherein the second pressure control plunger 5-2 and the first pressure control plunger 5-1 are both cylindrical, as shown in figure 3, the second pressure control plunger 5-2 is connected with the first pressure control plunger 5-1, the second pressure control plunger 5-2 and the first pressure control plunger 5-1 are integrally T-shaped, and the third pressure control plunger ring 5-3 is sleeved outside the second pressure control plunger 5-2.

The third pressure control plunger ring 5-3 and the second pressure control plunger 5-2 have two connection modes,

as shown in fig. 3, a third control plunger ring 5-3 is separated from the second control plunger 5-2, and a shear pin 16 is inserted into the second control plunger 5-2 from the outside of the third control plunger ring 5-3.

As shown in fig. 4, the second third pressure control plunger ring 5-3 and the second pressure control plunger 5-2 are integrally formed, but a shear stress groove 17 is formed at the interface of the two.

When the pressure control plunger 5 is inserted into the pressure control plunger hole, the third pressure control plunger ring 5-3 and the second pressure control plunger 5-2 are clamped in the third stage, and the first pressure control plunger 5-1 penetrates through the second stage and the first stage until the first pressure control plunger abuts against the spring shaft 4.

As shown in fig. 2, the diameter of the third control plunger ring 5-3 is equal to the diameter of the third stage to block the third control plunger ring 5-3 and block the via hole 11 together with the second control plunger 5-2;

the diameter of the second pressure control plunger 5-2 is smaller than the diameter of the second stage but larger than the diameter of the first stage, so that the second pressure control plunger 5-2, after being subjected to sufficient pressure from below, can move upwards and cause the third pressure control plunger ring 5-3 to separate from the second pressure control plunger 5-2, and then the second pressure control plunger 5-2 gets stuck in the second stage and does not enter the first stage.

The diameter of the first pressure control plunger 5-1 is equal to that of the first stage and is used for blocking the first stage and ensuring the sealing in the opening of the buffer sleeve 2, and the sealing ring connected between the outer wall of the first pressure control plunger 5-1 and the inner wall of the first stage of the pressure control plunger hole is also used for sealing.

The diameter of the second pressure control plunger 5-2 is smaller than or equal to the diameter of the through hole 11, so that the belleville spring 3 pushes the spring shaft 4 downwards, and the second pressure control plunger 5-2 and the first pressure control plunger 5-1 are ejected out of the pressure control plunger hole integrally, so that a shaft is communicated with a chamber in the buffer sleeve 2.

[ example 3 ]

On the basis of embodiment 2, as shown in fig. 2 and 3, a method for using a high-pressure activated pressure guide mechanism of a sliding sleeve tool is provided, when cementing and pressurizing, pressure in a shaft presses a second pressure control plunger 5-2 and a third pressure control plunger ring 5-3 of a pressure control plunger 5 to move towards the outside of the shaft, when the pressure in the shaft is larger than the sum of the pre-tightening force of a belleville spring 3 and the shearing force of a shearing stress groove 17, the second pressure control plunger 5-2 and the third pressure control plunger ring 5-3 are separated along the shearing stress groove 17, the second pressure control plunger 5-2 moves towards a spring shaft 4 and presses the belleville spring 3, then the second pressure control plunger 5-2 is clamped by the pressure control plunger hole in a second stage, and the first pressure control plunger 5-1 is still blocked in the first stage, so as to keep the shaft isolated from an installation cavity; after the pressure of the wellhead is relieved, the second pressure control plunger 5-2 receives the pressure reduction from the shaft, when the pressure of the shaft is lower than the elastic force of the belleville spring 3, the belleville spring 3 pushes the first pressure control plunger 5-1 and the second pressure control plunger 5-2 to be ejected out of the through hole 11, the first stage of the pressure control plunger hole is not blocked by the first pressure control plunger 5-1 any more, the shaft is communicated with the installation cavity in pressure, and the pressure in the installation cavity is changed.

The specific work flow is that the upper joint is connected to the bottom end of the shaft and is lowered to a preset position together. At the moment, the fixation between the third pressure control piston ring 5-3 and the second pressure control piston ring 5-2 is larger than the highest pressure of the well cementation operation, so that the third pressure control piston ring 5-3 and the second pressure control piston ring 5-2 are not activated in the well cementation process.

And (3) well cementation pressurization, as shown in figure 2, when the pressure in the shaft is greater than the sum of the pretightening force of the belleville spring 3 and the shearing force of the shearing stress groove 17, the third pressure control plunger ring 5-3 and the second pressure control plunger 5-2 are separated along the shearing stress groove 17, the second pressure control plunger 5-2 moves upwards until the second stage, at the moment, the first pressure control plunger 5-1 is still blocked in the first stage, and the high pressure in the shaft does not enter the cavity of the buffer sleeve 2. The differential pressure sliding sleeve 9 is still immobile and blocks the liquid outlet groove 15.

When the shear pin 16 is used, the shear pin 16 is forced to shear, thereby separating the third control pressure plunger ring 5-3 from the second control pressure plunger 5-2.

After the pressure of the wellhead is relieved, as shown in fig. 3, the pressure of the shaft from the lower part on the pressure control plunger 5 is reduced, when the pressure of the shaft is lower than the elastic force of the belleville spring 3, the belleville spring 3 pushes the spring shaft 4 to move towards the shaft direction, and then the first pressure control plunger 5-1 and the second pressure control plunger 5-2 are driven to move towards the shaft direction, finally the first pressure control plunger 5-1 and the second pressure control plunger 5-2 move towards the shaft direction and are pushed out from the via hole 11, the whole pressure control plunger hole is not blocked, and the communication between the shaft and the cavity opened by the buffer sleeve 2 is finished.

When specifically using, valve body 1 is as the top connection, sub-unit connection has other sliding sleeves and the outer valve body of sliding sleeve, sliding sleeve valve body lower extreme is connected with the lower clutch, top connection and lower clutch seal the sliding sleeve valve body from top to bottom, at the inside vacuole formation of sliding sleeve valve body, sliding connection has the pressure differential sliding sleeve in this cavity, the length of pressure differential sliding sleeve is less than the length of top connection to lower clutch, consequently, the part of pressure differential sliding sleeve upper end top to top connection has formed the upper plenum, instrument execution piston chamber in the pit promptly, the part of pressure differential sliding sleeve lower extreme to lower clutch has formed the lower plenum.

The liquid outlet groove of the sliding sleeve valve body is blocked by the pressure difference sliding sleeve, the communication between the inside and the outside of the sliding sleeve valve body is prevented, meanwhile, the pressure in the upper cavity and the pressure in the lower cavity are consistent, the position of the pressure difference sliding sleeve is ensured to be fixed, and the liquid outlet groove can be blocked all the time. Meanwhile, the differential pressure sliding sleeve is also connected with sealing rings at two sides of the liquid outlet groove, so that the isolation inside and outside the valve body is ensured.

The upper cavity is connected with a high-pressure activated pressure guide mechanism of a well cementation sliding sleeve tool of the upper joint through a pressure guide channel, once the high-pressure activated pressure guide mechanism of the well cementation sliding sleeve tool is communicated with a shaft, the upper cavity is communicated with the pressure in the shaft, the pressure in the shaft is higher than that in the lower cavity, the differential pressure sliding sleeve moves downwards under the action of the pressure, the liquid outlet groove is exposed finally, the inside and the outside of the sliding sleeve valve body are communicated, and the shaft is also communicated with the outside. The opening of the toe end sliding sleeve is realized. The well cementation sliding sleeve type tool in the pit is prevented from being started in the process of carrying out whole high-pressure test on the strength of the casing, so that the well cementation sliding sleeve tools such as the casing sliding sleeve and the toe end sliding sleeve meet the requirement of a shaft pressure test process.

The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.