阅读说明：本技术 一种完井防砂管柱用实时压力控制定位器 (Real-time pressure control positioner for well completion sand control pipe column ) 是由 左凯 姚伟达 陈胜宏 李宁 刘晓峰 张英 周战凯 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种完井防砂管柱用实时压力控制定位器,包括心轴、上接头、固定销钉、弹性爪、活塞和弹簧；心轴内部有通孔,外表面设置有心轴限位凸台,心轴限位凸台上设置有心轴传压孔；上接头包括大端部和小端部；上接头和弹性爪套装在心轴上,上接头小端部套装在弹性爪中且二者通过固定销钉连接,上接头小端部外表面高于心轴限位凸台上表面；活塞套装在心轴上且在弹性爪限位台阶二与心轴限位凸台之间,其前端通过弹簧与弹性爪限位台阶一相连；弹性爪靠近弹性爪限位台阶二上方的外表面设置有环形定位凸台,环形定位凸台沿心轴轴线的切面为梯形。本发明的定位器结构简单,操作便捷,降低了定位器无法激活或卡死的风险,提高了作业效率。(The invention discloses a real-time pressure control positioner for a well completion sand control tubular column, which comprises a mandrel, an upper joint, a fixed pin, an elastic claw, a piston and a spring, wherein the mandrel is fixedly connected with the upper joint; a through hole is formed in the mandrel, a mandrel limiting boss is arranged on the outer surface of the mandrel, and a mandrel pressure transmission hole is formed in the mandrel limiting boss; the upper joint comprises a large end part and a small end part; the upper joint and the elastic claw are sleeved on the mandrel, the small end part of the upper joint is sleeved in the elastic claw and is connected with the elastic claw through a fixing pin, and the outer surface of the small end part of the upper joint is higher than the upper surface of a limit boss of the mandrel; the piston is sleeved on the mandrel and is arranged between the elastic claw limiting step II and the mandrel limiting boss, and the front end of the piston is connected with the elastic claw limiting step I through a spring; an annular positioning boss is arranged on the outer surface of the elastic claw, which is close to the upper part of the second elastic claw limiting step, and the section of the annular positioning boss along the axis of the mandrel is trapezoidal. The positioner disclosed by the invention is simple in structure and convenient and fast to operate, the risk that the positioner cannot be activated or is blocked is reduced, and the operation efficiency is improved.)

1. The utility model provides a real-time pressure control locator is used to well completion sand control tubular column which characterized in that: comprises a mandrel (1), an upper joint (2), a fixed pin (3), an elastic claw (4), a piston (5) and a spring (6);

a through hole is formed in the mandrel (1), a mandrel limiting boss (1-1) is arranged on the outer surface of the mandrel (1), a mandrel pressure transmission hole (1-2) communicated with the through hole is formed in the mandrel limiting boss (1-1), and a mandrel limiting step (1-3) is arranged on one side of the mandrel limiting boss (1-1);

through holes with uniform inner diameters are formed in the upper joint (2), and the inner diameter of the upper joint (2) is the same as the outer diameter of the mandrel (1); the upper joint (2) comprises an upper joint large end part (2-1) and an upper joint small end part (2-2) which are arranged in a step shape, and the outer diameter of the upper joint large end part (2-1) is larger than that of the upper joint small end part (2-2);

a through hole is formed in the elastic claw (4), the inner diameter of the elastic claw (4) is the same as the outer diameter of the small end part (2-2) of the upper joint, and the elastic claw (4) and the mandrel (1) form shaft hole clearance fit; the inner surface of the front end of the elastic claw (4) is provided with an elastic claw limiting step I (4-1) and an elastic claw limiting step II (4-2) which are sequentially lowered in height;

the upper joint (2) and the elastic claw (4) are sleeved on the mandrel (1), the small end part (2-2) of the upper joint is sleeved in the elastic claw (4), and the small end part (2-2) of the upper joint is fixedly connected with the elastic claw (4) through the fixing pin (3); the small end part (2-2) of the upper joint is contacted with one side of the mandrel limiting boss (1-1) and used for limiting the movement of the upper joint (2) towards the direction of the elastic claw (4), and the outer surface of the small end part (2-2) of the upper joint is higher than the upper surface of the mandrel limiting boss (1-1); the elastic claw limiting step I (4-1) is in contact with the mandrel limiting step (1-3) and is used for limiting the movement of the elastic claw (4) towards the upper joint (2);

the piston (5) is internally provided with a through hole with uniform inner diameter, the inner diameter of the piston (5) is the same as the outer diameter of the mandrel (1), the outer diameter of the piston (5) is the same as the inner diameter of the elastic claw (4), the piston (5) is sleeved on the mandrel (1) and is arranged between the elastic claw limiting step II (4-2) and the mandrel limiting boss (1-1), O-shaped sealing rings (5-1) are respectively arranged on the inner surface and the outer surface of the piston (5), and the front end of the piston (5) is connected with the elastic claw limiting step I (4-1) through a spring (6);

the outer surface of the elastic claw (4) close to the upper part of the elastic claw limiting step II (4-2) is provided with an annular positioning boss (4-3), the section of the annular positioning boss (4-3) along the axis of the mandrel (1) is trapezoidal, one side of the annular positioning boss (4-3) close to the front end of the elastic claw (4) is a first positioning contact surface (4-4), the first positioning contact surface (4-4) is matched with the first positioning contact surface on the positioning sealing barrel of the outer sand control tool of the well completion sand control tubular column, and the other side of the annular positioning boss (4-3) is a positioner accessible contact surface (4-5).

2. The real-time pressure control positioner for a completion sand control string according to claim 1, wherein: the length of the piston (5) in the axial direction is greater than that of the annular positioning boss (4-3) in the axial direction, and the sum of the length of the piston (5) in the axial direction and the length of the annular positioning boss (4-3) in the axial direction is smaller than the minimum linear distance between the mandrel limiting boss (1-1) and the elastic claw limiting step II (4-2).

3. The real-time pressure control positioner for a completion sand control string according to claim 1, wherein: the outer surface where the annular positioning boss (4-3) of the elastic claw (4) is located is uniformly provided with a plurality of elastic claw through grooves (4-6) at intervals of 30-60 degrees along the axial direction.

4. The real-time pressure control positioner for a completion sand control string according to claim 3, wherein: the interval between adjacent elastic claw through grooves (4-6) is 30 degrees.

5. The real-time pressure control positioner for a completion sand control string according to claim 1, wherein: and O-shaped sealing rings (5-1) on the inner surface and the outer surface of the piston (5) are arranged at the rear end of the piston (5).

6. The real-time pressure control positioner for a completion sand control string according to claim 1, wherein: the number of the O-shaped sealing rings (5-1) on the inner surface and the outer surface of the piston (5) is respectively 2.

7. The real-time pressure control positioner for a completion sand control string according to claim 1, wherein: the inclination angle of a first positioning contact surface (4-4) on the annular positioning boss (4-3) is equal to the inclination angle of a passing contact surface (4-5) of the positioner.

8. The real-time pressure control positioner for a completion sand control string according to claim 1, wherein: the elastic claw (4) is made of a material with certain elasticity or ductility and is used for recovering by itself or under the action of external force after being deformed under stress.

9. The real-time pressure control positioner for a completion sand control string according to claim 8, wherein: the elastic claw (4) is made of 60Si2Mn spring steel.

10. The use of the real-time pressure control locator for a completion sand control string as claimed in any one of claims 1 to 9 for achieving the functions of contact positioning with the positioning sealing cylinder during the operation of the locator and resetting for pulling out the sand control tool after the operation of the locator is finished and allowing the positioning sealing cylinder to pass through.

Technical Field

The invention belongs to the field of sand control of well completion of oil fields, and particularly relates to a real-time pressure control positioner for a sand control pipe string of well completion.

Background

In the sand control operation of oil field well completion, because the removal of different positions need be carried out during the operation of sand control tubular column, in order to find the position accurately and fix a position and become very important, present fluid pressure type locator has a great deal of problem at present, and the operation process is complicated, and it is longer to occupy the activity duration, has the unable smooth phenomenon of activating and the card of positioner simultaneously, brings the puzzlement for the field operation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a real-time pressure control positioner for a well completion sand control pipe column, which is mainly used for positioning in the operation process of the well completion sand control pipe column of an oil field.

The technical purpose of the invention is realized by the following technical scheme.

A real-time pressure control positioner for a well completion sand control pipe column comprises a mandrel, an upper joint, a fixing pin, an elastic claw, a piston and a spring.

The mandrel is characterized in that a through hole is formed in the mandrel, a mandrel limiting boss is arranged on the outer surface of the mandrel, a mandrel pressure transmission hole communicated with the through hole is formed in the mandrel limiting boss, and a mandrel limiting step is arranged on one side of the mandrel limiting boss.

Through holes with uniform inner diameters are formed in the upper joint, and the inner diameter of the upper joint is the same as the outer diameter of the mandrel; the upper joint comprises an upper joint large end part and an upper joint small end part which are arranged in a step shape, and the outer diameter of the upper joint large end part is larger than that of the upper joint small end part.

A through hole is formed in the elastic claw, the inner diameter of the elastic claw is the same as the outer diameter of the small end part of the upper joint, and the elastic claw and the mandrel form shaft hole clearance fit; and a first elastic claw limiting step and a second elastic claw limiting step which are sequentially reduced in height are arranged on the inner surface of the front end of the elastic claw. The elastic claw is made of a material with certain elasticity or ductility and is used for self-recovery after being deformed under force or recovery under the action of external force, and 60Si2Mn spring steel is preferred.

The upper joint and the elastic claw are sleeved on the mandrel, the small end part of the upper joint is sleeved in the elastic claw, and the small end part of the upper joint is fixedly connected with the elastic claw through the fixing pin; the small end part of the upper joint is contacted with one side of the mandrel limiting boss and is used for limiting the movement of the upper joint towards the direction of the elastic claw; the outer surface of the small end part of the upper joint is higher than the upper surface of the mandrel limiting boss, so that a gap is reserved between the inner surface of the elastic claw and the upper surface of the mandrel limiting boss; and the first elastic claw limiting step is in contact with the mandrel limiting step and is used for limiting the movement of the elastic claw towards the upper joint.

The piston is sleeved on the mandrel and arranged between the second elastic claw limiting step and the mandrel limiting boss, and O-shaped sealing rings are mounted on the inner surface and the outer surface of the piston; the front end of the piston is connected with the first elastic claw limiting step through a spring, and the initial position of the piston is close to the mandrel limiting boss or is in contact with the mandrel limiting boss due to the pretightening force of the spring.

The outer surface of the elastic claw, which is close to the position above the elastic claw limiting step II, is provided with an annular positioning boss, the section of the annular positioning boss along the axis of the mandrel is trapezoidal, one side of the annular positioning boss, which is close to the front end of the elastic claw, is a first positioning contact surface, the first positioning contact surface is matched with a first positioning contact surface on a positioning sealing barrel of an outer sand control tool of the well completion sand control pipe column, and the other side of the annular positioning boss is a contact surface through which a positioner can pass.

The outer surface of the annular positioning boss of the elastic claw is uniformly provided with a plurality of elastic claw through grooves at intervals of 30-60 degrees along the axial direction, and the elastic claw through grooves are used for providing spaces for two sides of the annular positioning boss so that the annular positioning boss is more easily extruded and deformed in the resetting process of the positioner.

In one embodiment of the invention, the interval between adjacent elastic claw through grooves is 30 degrees.

In one embodiment of the invention, the length of the piston in the axial direction is greater than that of the annular positioning boss in the axial direction, and the sum of the length of the piston in the axial direction and the length of the annular positioning boss in the axial direction is less than the minimum linear distance between the mandrel limiting boss and the elastic claw limiting step II; namely: when the piston moves to the position where the front end of the piston is contacted with the elastic claw limiting step II, the whole annular positioning boss is supported by the piston; when the piston moves to the rear end to be contacted with the mandrel limiting boss, the annular positioning boss loses the support of the piston. In one embodiment of the invention, the number of the O-shaped sealing rings on the inner surface and the outer surface of the piston is 2 respectively, and the O-shaped sealing rings are arranged at the rear end of the piston.

In one embodiment of the invention, the inclination angle of the first positioning contact surface on the annular positioning boss is equal to the inclination angle of the first passing contact surface of the positioner.

The real-time pressure control positioner for the well completion sand control tubular column is applied to the function of contacting and positioning the positioning sealing barrel during the operation of the positioner and the function of resetting the sand control tool which can pass through the positioning sealing barrel when the positioner is pulled out after the operation is finished.

The working process of the real-time pressure control positioner for the well completion sand control pipe column for positioning comprises the following steps:

after the mandrel is pressed to a specified pressure value, the pressure is transmitted to a gap between the inner surface of the elastic claw and the upper surface of the mandrel limiting boss through the mandrel pressure transmission hole so as to be transmitted to the rear end of the piston, after the rear end of the piston is stressed, the piston overcomes the pretightening force of the spring to move towards the second elastic claw limiting step until the piston is contacted with the second elastic claw limiting step, and the piston stops moving due to the blocking of the second elastic claw limiting step; the inner layer service tool of the well completion sand control pipe string connected through the pressing-down positioner enables a first positioning contact surface on the annular positioning boss to be in contact with a positioning contact surface on the positioning sealing barrel of the outer layer sand control tool and generate certain tonnage stress, so that the elastic claw is stressed by radial force, but because the outer surface of the piston is in contact with the inner surface of the elastic claw at the annular positioning boss, the inner surface of the piston is in contact with the outer surface of the mandrel, so that the elastic claw is radially supported and cannot be radially deformed, and finally the contact positioning of the positioner and the positioning sealing barrel is realized.

The invention relates to a working process for resetting a real-time pressure control positioner for a well completion sand control pipe column, which comprises the following steps:

after the positioning is finished, the pressure inside and outside the mandrel is balanced through pressure relief, the rear end of the piston is not stressed any more, the front end of the piston moves towards the direction of the mandrel limiting boss under the action of the spring until the front end of the piston is contacted with the mandrel limiting boss, the piston stops moving due to the blocking of the mandrel limiting boss, and at the moment, the elastic claw is in a non-supporting state; when the inlayer service tool that the locator is connected is pulled out outer sand control instrument, can pass through a plurality of location sealing barrel, consequently locator accessible contact surface on the annular location boss can with the location sealing barrel contact atress on the outer sand control instrument, the elastic claw receives the radial force that a location sealing barrel produced promptly, because the elastic claw has lost radial support, when this radial force reaches certain numerical value, the elastic claw produces bending deformation, it is inboard to finally realize that the elastic claw enters the location sealing barrel, accomplish the locator and reset.

Compared with the prior art, the real-time pressure control positioner for the well completion sand control tubular column adopts the structural design of the pre-tightening force of the spring and the supporting and limiting, so that the positioning activation and resetting functions of the positioner can be realized only by pressing and releasing the pressure of the mandrel during operation, the operation process is simple, and the occupied operation time is short; meanwhile, due to the fact that the structure is simple, the risk that the positioner cannot be activated or is blocked during field operation is remarkably reduced, and timeliness of well completion sand prevention operation is improved.

Drawings

FIG. 1 is a partial cross-sectional view of a real-time pressure control positioner for a completion sand control string of the present invention;

FIG. 2 is a partial cross-sectional view of the activation state of the real-time pressure control positioner for a completion sand control string of the present invention;

reference numerals:

1-a mandrel; 1-1-mandrel limiting boss; 1-2-mandrel pressure transfer holes; 1-3-mandrel limiting steps; 2-upper joint; 2-1-big end of upper joint; 2-2-upper joint small end; 3-fixing the pin; 4-elastic claws; 4-1-elastic claw limit step I; 4-2-elastic claw limit step II; 4-3-annular positioning boss; 4-4-positioning the first contact surface; 4-5-the retainer can pass through the contact surface; 4-6-elastic claw through groove; 5-a piston; 5-1-O type sealing ring; 6-spring.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

As shown in fig. 1 and 2, a real-time pressure control positioner for a completion sand control string comprises a mandrel 1, an upper joint 2, a fixing pin 3, an elastic claw 4, a piston 5 and a spring 6;

the mandrel limiting device is characterized in that a through hole is formed in the mandrel 1, a mandrel limiting boss 1-1 is arranged on the outer surface of the mandrel 1, a mandrel pressure transmitting hole 1-2 communicated with the through hole is formed in the mandrel limiting boss 1-1, and a mandrel limiting step 1-3 is arranged on one side of the mandrel limiting boss 1-1.

Through holes with uniform inner diameters are formed in the upper connector 2, and the inner diameter of the upper connector 2 is the same as the outer diameter of the mandrel 1; the upper joint 2 comprises an upper joint large end part 2-1 and an upper joint small end part 2-2 which are arranged in a step shape, and the outer diameter of the upper joint large end part 2-1 is larger than that of the upper joint small end part 2-2.

A through hole is formed in the elastic claw 4, the inner diameter of the elastic claw 4 is the same as the outer diameter of the small end part 2-2 of the upper joint, and the elastic claw 4 and the mandrel 1 form shaft hole clearance fit; the inner surface of the front end of the elastic claw 4 is provided with an elastic claw limiting step I4-1 and an elastic claw limiting step II 4-2 which are sequentially lowered in height. The elastic claw 4 is made of 60Si2Mn spring steel.

The upper joint 2 and the elastic claw 4 are sleeved on the mandrel 1, the small end part 2-2 of the upper joint is sleeved in the elastic claw 4, and the small end part 2-2 of the upper joint and the elastic claw 4 are fixedly connected through a fixing pin 3; the small end part 2-2 of the upper joint is contacted with one side of the mandrel limiting boss 1-1 and is used for limiting the movement of the upper joint 2 towards the direction of the elastic claw 4; the outer surface of the small end part 2-2 of the upper joint is higher than the upper surface of the mandrel limiting boss 1-1, so that a gap is reserved between the inner surface of the elastic claw 4 and the upper surface of the mandrel limiting boss 1-1; the first elastic claw limiting step 4-1 is in contact with the mandrel limiting step 1-3 and is used for limiting the movement of the elastic claw 4 towards the direction of the upper joint 2.

The piston 5 is sleeved on the mandrel 1 and arranged between the elastic claw limiting step II 4-2 and the mandrel limiting boss 1-1, and 2O-shaped sealing rings 5-1 are arranged on the inner surface and the outer surface of the rear end of the piston 5; the front end of the piston 5 is connected with a first elastic claw limiting step 4-1 through a spring 6, and the initial position of the piston 5 is close to a mandrel limiting boss 1-1 due to the pretightening force of the spring 6.

An annular positioning boss 4-3 is arranged on the outer surface of the elastic claw 4 close to the upper part of the elastic claw limiting step II 4-2, the section of the annular positioning boss 4-3 along the axis of the mandrel 1 is trapezoidal, a positioning contact surface I4-4 is arranged on one side of the annular positioning boss 4-3 close to the front end of the elastic claw 4, the positioning contact surface I4-4 is matched with a positioning contact surface on a positioning sealing cylinder of an outer sand control tool of the well completion sand control pipe column, and a positioner passing contact surface 4-5 is arranged on the other side of the annular positioning boss 4-3. The inclination angle of the first positioning contact surface 4-4 is equal to the inclination angle of the second positioning contact surface 4-5. The outer surface of the annular positioning boss 4-3 of the elastic claw 4 is uniformly provided with a plurality of elastic claw through grooves 4-6 at intervals of 30 degrees along the axial direction, and the elastic claw through grooves are used for providing space for two sides of the annular positioning boss 4-3, so that the annular positioning boss is more easily extruded and deformed in the resetting process of the positioner.

The length of the piston 5 in the axial direction is greater than that of the annular positioning boss 4-3 in the axial direction, and the sum of the length of the piston 5 in the axial direction and the length of the annular positioning boss 4-3 in the axial direction is smaller than the minimum linear distance between the mandrel limiting boss 1-1 and the elastic claw limiting step II 4-2; namely: when the piston 5 moves to the position where the front end of the piston is contacted with the second elastic claw limiting step 4-2, the annular positioning boss 4-3 can be wholly supported by the piston 5; when the piston 5 moves to the rear end to contact with the mandrel limiting boss 1-1, the annular positioning boss 4-3 can entirely lose the support of the piston 5.

The real-time pressure control positioner for the well completion sand control tubular column is used for realizing the function of contacting and positioning the positioner with the positioning sealing barrel during operation and the reset function of pulling out a sand control tool after the operation of the positioner is finished and allowing the sand control tool to pass through the positioning sealing barrel.

The working process of the real-time pressure control positioner for the well completion sand control pipe column for positioning comprises the following steps:

after the mandrel 1 is pressed to a specified pressure value, pressure is transmitted to a gap between the inner surface of the elastic claw 4 and the upper surface of the mandrel limiting boss 1-1 through the mandrel pressure transmission hole 1-2 so as to be transmitted to the rear end of the piston 5, after the rear end of the piston 5 is stressed, the piston 5 overcomes the pretightening force of the spring 6 to move towards the elastic claw limiting step II 4-2 until the piston 5 is contacted with the elastic claw limiting step II 4-2, and then the piston 5 stops moving due to the blocking of the elastic claw limiting step II 4-2; the inner layer service tool of the well completion sand control pipe string connected by the pressing-down positioner enables the positioning contact surface I4-4 on the annular positioning boss 4-3 to be in contact with the positioning contact surface on the positioning sealing barrel of the outer layer sand control tool and generate certain tonnage stress, so that the elastic claw 4 is subjected to radial force action, but the outer surface of the piston 5 is in contact with the inner surface of the elastic claw 4 at the annular positioning boss 4-3, the inner surface of the piston 5 is in contact with the outer surface of the mandrel 1, so that the elastic claw 4 is radially supported and cannot be radially deformed, and finally the contact positioning of the positioner and the positioning sealing barrel is realized.

The invention relates to a working process for resetting a real-time pressure control positioner for a well completion sand control pipe column, which comprises the following steps:

after positioning is finished, pressure inside and outside the mandrel 1 is balanced through pressure relief, the rear end of the piston 5 is not stressed any more, the front end of the piston 5 moves towards the direction of the mandrel limiting boss 1-1 under the action of the spring 6 until the front end of the piston contacts with the mandrel limiting boss 1-1, the piston 5 stops moving due to the blocking of the mandrel limiting boss 1-1, and at the moment, the elastic claw 4 is in a non-supporting state; when the inner layer service tool connected with the positioner is pulled out of the outer layer sand control tool, the inner layer service tool can pass through a plurality of positioning sealing cylinders, so that the positioner on the annular positioning boss 4-3 can contact with the positioning sealing cylinders on the outer layer sand control tool through the contact surface 4-5 to bear force, namely, the elastic claw 4 is subjected to radial force generated by the positioning sealing cylinders, and as the elastic claw 4 loses radial support, when the radial force reaches a certain numerical value, the elastic claw 4 generates bending deformation, and finally, the elastic claw enters the inner side of the positioning sealing cylinders to complete the resetting of the positioner.

The real-time pressure control positioner for the well completion sand control tubular column adopts the structural design of the pre-tightening force of the spring and the supporting and limiting, so that the positioning activation and resetting functions of the positioner can be realized only by pressing and releasing the pressure of the mandrel during operation, the operation process is simple, and the occupied operation time is short; meanwhile, due to the fact that the structure is simple, the risk that the positioner cannot be activated or is blocked during field operation is remarkably reduced, and timeliness of well completion sand prevention operation is improved.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.