阅读说明：本技术 一种机械控制的反循环单流阀 (Mechanically controlled reverse circulation check valve ) 是由 杨国 王璞 陶风 王琼 王慧 张健 朱向斌 阎新颖 席浩腾 于 2020-07-01 设计创作，主要内容包括：本发明涉及一种机械控制的反循环单流阀,属油气井井下作业工具领域。它由上接头、下接头、芯轴、指示爪和阀体构成,芯轴的圆周上装有多个指示爪和定位爪,指示爪的一端端头设置有导向销,与导向销对应的芯轴上设置有滑孔,导向销的一端穿过滑孔与球座连接。该单流阀不仅具备开关工具开关充填滑套的作用,而且还具备反循环单流阀单向流动的作用,同时具有联动功能,在打开充填滑套的同时不能进行反循环,在关闭充填滑套的同时可以进行反循环；解决了现有开关工具需要依靠定位器来往复的进行定位,存有操作复杂、效率低、风险高,且不能用于斜度较大的油气井,使用范围狭窄的问题；特别适用于油气井充填作业使用。(The invention relates to a reverse circulation check valve controlled by a machine, belonging to the field of downhole operation tools of oil and gas wells. The ball seat is composed of an upper joint, a lower joint, a mandrel, indicating claws and a valve body, wherein the circumference of the mandrel is provided with a plurality of indicating claws and positioning claws, one end of each indicating claw is provided with a guide pin, the mandrel corresponding to the guide pin is provided with a sliding hole, and one end of the guide pin penetrates through the sliding hole to be connected with the ball seat. The check valve not only has the function of opening and closing a filling sliding sleeve of a tool, but also has the function of one-way flow of a reverse circulation check valve, and has a linkage function, the reverse circulation can not be carried out when the filling sliding sleeve is opened, and the reverse circulation can be carried out when the filling sliding sleeve is closed; the problems that the existing switch tool needs to be positioned in a reciprocating manner by a positioner, has complex operation, low efficiency and high risk, cannot be used for an oil-gas well with larger inclination and has a narrow application range are solved; is particularly suitable for filling operation of oil and gas wells.)

1. The utility model provides a mechanical control's reverse circulation check valve, it comprises top connection (1), lower clutch (2), dabber (3), instruction claw (4) and valve body (5), its characterized in that: an upper joint (1) is installed at one end of the mandrel (3) through threads, and a lower joint (2) is installed at the other end of the mandrel (3) through threads; a ball seat (7) is movably arranged in the mandrel (3), and one end of the ball seat (7) is provided with a valve body (5) through a guide plate (9) and a spring (10); the ball seat (7) and the valve body (5) are arranged concentrically; the circumference of the mandrel (3) is provided with a plurality of indicating claws (4) and positioning claws (11), one end of each indicating claw (4) is provided with a guide pin (12), the mandrel (3) corresponding to the guide pins (12) is provided with a sliding hole (13), and one end of each guide pin (12) penetrates through the sliding hole (13) to be connected with the ball seat (7).

2. A mechanically controlled reverse circulation check valve according to claim 1, wherein: the ball seat (7) is a tubular body, and a sealing ring is arranged between the ball seat (7) on two sides of the sliding hole (13) and the mandrel (3).

3. A mechanically controlled reverse circulation check valve according to claim 2, wherein: and overflowing holes (8) are uniformly distributed on the circumference of the end head at one end of the ball seat (7).

4. A mechanically controlled reverse circulation check valve according to claim 1, wherein: the central part of the mandrel (3) is provided with a step-shaped central hole through hole.

5. A mechanically controlled reverse circulation check valve according to claim 1, wherein: guide plate (9) be discoid, guide plate (9) central point is provided with the valve body pilot hole, the equipartition has the water conservancy diversion hole on the peripheral guide plate (9) of valve body pilot hole, valve body (5) are through valve body pilot hole slidable mounting on guide plate (9).

6. A mechanically controlled reverse circulation check valve according to claim 5, wherein: the valve body (5) is T-shaped, the end of the valve body (5) is provided with a sealing flange, and the circumference of the sealing flange is a slope surface.

7. A mechanically controlled reverse circulation check valve according to claim 1, wherein: the middle part of the indicating claw (4) is provided with a bulge, and a clamping groove (14) is arranged on the bulge.

8. A mechanically controlled reverse circulation check valve according to claim 1, wherein: the indicating claw (4) is in threaded connection with the positioning claw (11), and the indicating claw (4) and the positioning claw (11) are limited and fixed through a set screw (6).

Technical Field

The invention relates to a reverse circulation check valve controlled by a machine, belonging to the field of downhole operation tools of oil and gas wells.

Background

In the field of sand control in oil fields, the currently commonly used mechanical sand control mode is a gravel packing sand control technology, namely, a tubular column is placed to a packing position, gravel packing operation is performed in a positive circulation mode, and sand washing is performed in a reverse circulation mode after the packing is completed so as to wash out redundant gravel remained in the oil pipe. This is accomplished by the use of a reverse circulation check valve in conjunction with a switch tool. The main function of the reverse circulation check valve is to control the fluid flow direction by opening the valve. During reverse circulation operation, the ball is seated on the ball seat to play a role in sealing, fluid in the annular space enters the oil pipe and is blocked at the oil pipe, the lower passage is closed, and then the fluid changes the flowing direction and is discharged out of a well mouth through the oil pipe, so that reverse circulation well flushing is realized. The main function of the switch tool is to switch a service tool of the filling sliding sleeve during the filling operation. The construction is realized by lifting and lowering the pipe column, and when the filling operation is performed, the filling sliding sleeve needs to be opened, and a positive circulation function needs to be established; after the filling operation is completed, the filling sliding sleeve needs to be closed, and meanwhile, a reverse circulation function is established. Often this kind of operation needs rely on the locator to come reciprocal location, has the operation complicacy, inefficiency, the risk height, and can not be used for the great oil gas well of inclination, and application range is narrow not enough.

Disclosure of Invention

The invention aims to: the mechanical control reverse circulation check valve has the advantages of being simple in operation, high in efficiency, low in risk, free of failure due to too large well deviation and wide in application range.

The technical scheme of the invention is as follows:

the utility model provides a reverse circulation check valve of mechanical control, it comprises top connection, lower clutch, dabber, instruction claw and valve body, its characterized in that: an upper joint is arranged at one end of the mandrel in a threaded manner, and a lower joint is arranged at the other end of the mandrel in a threaded manner; a ball seat is movably arranged in the mandrel, and one end of the ball seat is provided with a valve body through a guide plate and a spring; the ball seat and the valve body are arranged concentrically; the circumference of the mandrel is provided with a plurality of indicating claws and positioning claws, one end of each indicating claw is provided with a guide pin, the mandrel corresponding to the guide pin is provided with a sliding hole, and one end of each guide pin penetrates through the sliding hole to be connected with the ball seat.

The ball seat is a tubular body, and a sealing ring is arranged between the ball seat and the mandrel at two sides of the sliding hole.

And overflowing holes are uniformly distributed on the circumference of the end socket at one end of the ball seat.

The central part of the mandrel is provided with a step-shaped central hole through hole.

The guide plate be discoid, guide plate central point position is provided with the valve body pilot hole, the equipartition has the water conservancy diversion discharge orifice on the peripheral guide plate of valve body pilot hole. The valve body is slidably mounted on the guide plate through the valve body assembling hole.

The valve body be the T type, the end of valve body is provided with sealing flange, sealing flange's circumference is domatic.

The middle part of the indicating claw is provided with a bulge, and a clamping groove is arranged on the bulge.

The indicating claw and the positioning claw are in threaded connection, and the indicating claw and the positioning claw are limited and fixed through a set screw.

The invention has the beneficial effects that:

according to the mechanically controlled reverse circulation check valve, the ball seat and the valve body are concentrically arranged, the valve body can be always concentric with the ball seat, and cannot be changed due to well deviation, so that the sealing is reliable, the upper channel and the lower channel are more effectively isolated, and the flow of reverse circulation liquid is maximized; the check valve not only has the function of opening and closing a filling sliding sleeve of a tool, but also has the function of one-way flow of a reverse circulation check valve, and has a linkage function, the reverse circulation can not be carried out when the filling sliding sleeve is opened, and the reverse circulation can be carried out when the filling sliding sleeve is closed; the switch tool has the characteristics of simple operation, high efficiency, low risk, safety, reliability and wide application range, and solves the problems that the existing switch tool needs to be positioned by a positioner in a reciprocating way, has complex operation, low efficiency and high risk, cannot be used for an oil-gas well with larger inclination and has a narrow application range; is particularly suitable for filling operation of oil and gas wells.

Drawings

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

FIG. 2 is a schematic diagram of the open state of the present invention;

FIG. 3 is a schematic view of the closed state of the present invention;

FIG. 4 is a schematic view of the present invention showing the opening of the filling slide sleeve;

figure 5 is a schematic view of the present invention closing the filling shoe.

In the figure: 1. the device comprises an upper joint, a lower joint, a mandrel, an indicating claw, a valve body, a fastening screw, a ball seat, an overflow hole, a guide plate, a spring, a positioning claw, a guide pin, a guide hole, a sliding hole and a clamping groove, wherein the upper joint 2, the lower joint 3, the mandrel, 4, the indicating claw 5, the valve body, 6, the; 15. a filling sliding sleeve 16, an inner sliding sleeve 17, a filling hole 18 and an outer cylinder.

Detailed Description

The mechanically controlled reverse circulation check valve is composed of an upper connector 1, a lower connector 2, a mandrel 3, an indicating claw 4 and a valve body 5, wherein the upper connector 1 is installed at one end of the mandrel 3 through threads, and circumferential limiting is carried out between the upper connector 1 and the mandrel 3 through a set screw 6; the upper joint 1 and the mandrel 3 are kept sealed through a sealing ring. The other end of the mandrel 3 is provided with a lower joint 2 in a threaded manner; a sealing ring is arranged between the lower joint 2 and the mandrel 3. The mandrel 3 is a tubular body, and a stepped central hole through hole is formed in the central part of the mandrel 3. A ball seat 7 is movably arranged in the mandrel 3, the ball seat 7 is a tubular body, and overflowing holes 8 are uniformly distributed in the circumference of the end head of one end of the ball seat 7. A guide plate 9 is arranged in the mandrel 3 at one end of the ball seat 7, the guide plate 9 is disc-shaped, a valve body assembly hole is formed in the center of the guide plate 9, and guide flow holes are uniformly distributed in the guide plate on the periphery of the valve body assembly hole; the guide plate 9 is fixedly arranged in the central hole of the mandrel 3 through the matching of the shoulder surface of the central hole of the mandrel 3 and the end surface of the upper joint 1.

The guide plate 9 is movably provided with a valve body 5 through a valve body assembly hole and a spring 10; the valve body 5 is T-shaped, the end of the valve body 5 is provided with a sealing flange, and the circumference of the sealing flange is a slope; the ball seat 7 and the valve body 5 are arranged concentrically (coaxially), and the guide plate 9 is used for limiting the movement direction of the valve body 5 and controlling the flow direction of fluid, so that the valve body 5 can only move upwards in the axial direction, and meanwhile, the centering effect is also achieved. Because of the axial spacing of the guide plate 9, the eccentric tubular column of the valve body 5 in a highly deviated well is avoided, and the valve body 5 can not be well seated on a sealing position, so that the valve body 5 can be always concentric with the ball seat 7 and can not be changed due to the deviation of the well, thereby ensuring the reliable sealing and more effectively isolating the upper channel and the lower channel.

A plurality of indicating claws 4 and positioning claws 11 are arranged on the circumference of the mandrel 3, the indicating claws 4 are in threaded connection with the positioning claws 11, and the indicating claws 4 are in limited fixation with the positioning claws 11 through set screws 6. The middle part of the indicating claw 4 is provided with a bulge, and a clamping concave 14 is arranged on the bulge. One end of the indicating claw 4 is provided with a guide pin 12, a slide hole 13 is arranged on the mandrel 3 corresponding to the guide pin 12, and one end of the guide pin 12 passes through the slide hole 13 to be connected with the ball seat 7. Sealing rings are arranged between the ball seat 7 and the mandrel 3 at two sides of the sliding hole 13 to ensure the sealing between the ball seat 7 and the mandrel 3 (see figures 1, 2 and 3).

The mechanically controlled reverse circulation check valve can not only control the flow direction of fluid; and can control the switch of the filling sliding sleeve 15, when in work, the reverse circulation check valve is connected with an upper service tool pipe column through an upper connector 1 and is connected with a lower service tool pipe column through a lower connector 2. When the filling sliding sleeve 15 needs to be opened in the filling operation, the reverse circulation check valve is lowered into the filling sliding sleeve through a pipe column, in the process, the reverse circulation check valve is in an open state, the filling hole 17 in the filling sliding sleeve 17 is in a closed state, the outer reducing shoulder on the mandrel 3 forms an axial limiting collision on the end head of the indicating claw 4, the reverse circulation check valve integrally moves downwards (from left to right according to the drawing), so that the clamping jaws on the inner sliding sleeve 16 of the filling sliding sleeve 15 gradually slide into the clamping recesses 14 of the reverse circulation check valve, the inner sliding sleeve 16 and the indicating claw 4 are clamped and formed into a whole, and the clamping jaws move downwards along with the integral descending of the reverse circulation check valve, so that the blocking state of the inner sliding sleeve 16 on the filling hole 17 is released, and the operation purpose of opening the filling sliding sleeve 15 is achieved (see fig. 4).

After the filling sliding sleeve 15 is fixed and the filling operation is completed, the service tool string is lifted up to drive the reverse circulation check valve to move upwards (from right to left in the drawing), in the process, the indicating claw 4 of the reverse circulation check valve drives the inner sliding sleeve 16 to move upwards, so that the inner sliding sleeve 16 forms a blocking state for the filling hole 17 again, and the purpose of closing the filling sliding sleeve 15 is achieved. When the filling sliding sleeve 15 is closed, the outer cylinder 18 connected with the filling sliding sleeve 15 forms an axial block for the inner sliding sleeve 16, the inner sliding sleeve 16 does not move upwards along with the reverse circulation check valve, at the moment, a relative sliding is formed between the indicating claw 4 of the reverse circulation check valve and the mandrel 3, namely, the indicating claw 4 is kept in a static state under the action of the inner sliding sleeve 16; the mandrel 3 continues up with the service tool string.

In the process that the mandrel 3 moves upwards along with the service tool string, due to the action of the guide pin 12, the indicating claw 4 and the ball seat 7 form a whole, and in the process that the mandrel 3 moves upwards along with the service tool string, the ball seat 7 and the mandrel 3 also form relative sliding, so that the overflowing hole 8 at the end of the ball seat 7 is gradually retracted into the small-diameter hole of the mandrel 3 to form sealing; in the process, the extrusion force of the ball seat 7 on the valve body 5 disappears, and under the action of the spring 10, the valve body 5 is in sealing fit with the port of the through hole of the central hole of the small-diameter section of the mandrel 3; thereby closing the flow passage of the reverse circulation check valve and realizing the closing of the reverse circulation check valve. The reverse circulation check valve has the function of a one-way valve, namely, the reverse circulation well-flushing operation can be carried out, so that the redundant gravel in the oil pipe can be washed out of the shaft (see the attached figure 5).

This reverse circulation check valve is because ball seat 7 sets up with valve body 5 is concentric, and valve body 5 can remain concentric with ball seat 7 all the time, can not change because of the reason of well skew to make sealed reliable, the passageway about more effectual isolation guarantees reverse circulation liquid flow maximize. The check valve realizes the opening of the filling sliding sleeve 15 by the descending of the pipe column, realizes the closing of the filling sliding sleeve 15 and the closing of the check valve by the ascending of the pipe column, has the function of opening and closing the filling sliding sleeve by a switching tool, has the function of one-way flow of the reverse circulation check valve, has a linkage function, can not perform reverse circulation when opening the filling sliding sleeve 15, and can perform reverse circulation well washing operation when closing the filling sliding sleeve 15; the switch tool has the characteristics of simple operation, high efficiency, low risk, safety, reliability and wide application range, and solves the problems that the existing switch tool needs to be positioned by a positioner in a reciprocating way, has complex operation, low efficiency and high risk, cannot be used for an oil-gas well with larger inclination and has a narrow application range; is particularly suitable for filling operation of oil and gas wells.