阅读说明：本技术 一种步进丢手式井下节流器打捞工具及打捞方法 (Step releasing type underground choke salvaging tool and salvaging method ) 是由 李旭梅 张安康 陈晓丽 张家富 王效明 马得华 王昌龄 李曙华 巨亚锋 胡相君 于 2020-04-30 设计创作，主要内容包括：本发明属于井下作业工具技术领域,具体涉及一种步进丢手式井下节流器打捞工具及打捞方法。本发明上接头、上拉杆、压帽、导压套、固定座、第一卡簧、第二卡簧、控制杆、大弹簧、外筒、芯轴、隔环、矩形弹簧、卡爪和锁定套的有机组合而成。本发明能够通过调整第一卡簧、第二卡簧与控制杆上的卡接位置,预先设定打捞次数,打捞过程不会突然丢手,在打捞上提下放次数达到设定次数后,可自动丢手。本发明能够满足气田步进丢手式井下节流器打捞对安全、可靠、低成本的打捞要求,且结构简单,便于操作且成本较低。本发明的构成中无安全剪钉,因此丢手更加可靠。本发明能够用较大的震击力或打捞拉力实施节流器打捞,而不产生丢手。(The invention belongs to the technical field of downhole operation tools, and particularly relates to a fishing tool and a fishing method for a stepping releasing type downhole choke. The invention is formed by organically combining an upper joint, an upper pull rod, a pressing cap, a pressure guide sleeve, a fixed seat, a first snap spring, a second snap spring, a control rod, a large spring, an outer cylinder, a mandrel, a spacer ring, a rectangular spring, a clamping jaw and a locking sleeve. According to the invention, the fishing frequency can be preset by adjusting the clamping positions of the first clamp spring, the second clamp spring and the control rod, so that the fishing process cannot be suddenly released, and the fishing can be automatically released after the fishing lifting and lowering frequency reaches the set frequency. The invention can meet the salvage requirements of the gas field stepping releasing type underground choke on safety, reliability and low cost, and has simple structure, convenient operation and lower cost. The invention has no safe shear pin, so the releasing is more reliable. The invention can use larger shocking force or fishing pulling force to implement the fishing of the choke, and no release is generated.)

1. The utility model provides a step-by-step formula of giving up downhole choke fishing tool which characterized in that: the clamping device comprises an upper joint (1), an upper pull rod (2), a pressing cap (4), a pressure guide sleeve (6), a fixed seat (7), a first clamp spring (8), a second clamp spring (9), a control rod (11), a large spring (12), an outer cylinder (13), a mandrel (14), a spacer ring (15), a rectangular spring (17), a clamping jaw (19) and a locking sleeve (20); the joint (1), the pressing cap (4), the pressure guide sleeve (6), the outer cylinder (13), the clamping jaws (19) and the locking sleeve (20) are sequentially connected from top to bottom; the rectangular spring (17) is sleeved between the outer cylinder (13) and the clamping jaw (19); the fixed seat (7) is connected to the inner side wall of the pressure guide sleeve (6); the upper end of the upper pull rod (2) is connected with the upper part of the inner side wall of the upper joint (1), and the lower end of the upper pull rod (2) is connected with the fixed seat (7); the outer side wall of the upper part of the control rod (11) is provided with a clamping part; the fixed seat (7) is connected with a first clamp spring (8) and is connected with the clamping part of the control rod (11) through the first clamp spring (8); the outer side wall of the upper part of the mandrel (14) is detachably connected with the inner side wall of the lower part of the pressure guide sleeve (6); the large spring (12) is sleeved on the outer side wall of the mandrel (14) below the pressure guide sleeve (6); the upper end of the mandrel (14) is fixedly connected with a second clamp spring (9) and is connected with the control rod (11) through the second clamp spring (9); a locking mechanism capable of moving horizontally is arranged on the side wall of the mandrel (14), and two sides of the locking mechanism are respectively contacted with the inner side wall below the pressure guide sleeve (6) and the control rod (11); the lower part of the mandrel (14) is connected with a jaw (19) through a connecting mechanism; the spacer ring (15) is sleeved between the lower part of the large spring (12) and the pressure guide sleeve (6).

2. The fishing tool for a stepped release downhole choke of claim 1, wherein: the locking mechanism is a locking block (16).

3. The fishing tool for a stepped release downhole choke of claim 2, wherein: the locking block (16) is a cylindrical structure with a chamfer at the contact end with the pressure guide sleeve (6).

4. The fishing tool for a stepped release downhole choke of claim 1, wherein: the connecting mechanism is a connecting block (18); the connecting block (18) is an integrated structure formed by two cylindrical bodies with different outer diameters; the end with the large outer diameter is fixedly connected with the outer side wall of the mandrel (14), and the end with the small outer diameter is fixedly connected with the side wall of the clamping jaw (19).

5. The fishing tool for a stepped release downhole choke of claim 1, wherein: the clamping part arranged on the outer side wall of the upper part of the control rod (11) is a multi-stage clamping tooth; the latch is a unidirectional latch which is used for controlling the rod (11) to move upwards only.

6. The fishing tool for a stepped release downhole choke of claim 1, wherein: the upper end of the upper pull rod (2) is detachably connected with the inner side wall of the upper part of the upper joint (1); the lower part of the upper pull rod (2) is detachably connected with the fixed seat (7) through threads.

7. The fishing tool for a stepped release downhole choke of claim 6, wherein: the upper end of the upper pull rod (2) is in threaded connection with the inner side wall of the upper part of the upper joint (1); the lower part of the upper pull rod (2) is in threaded connection with the fixed seat (7).

8. The fishing tool for a stepped release downhole choke of claim 1, wherein: the pressure cap (4) is detachably connected with the pressure guide sleeve (6) through threads; the pressure guide sleeve (6) is detachably connected with the mandrel (14) through threads.

9. The fishing tool for a stepped release downhole choke of claim 1, wherein: the upper joint (1) and the upper pull rod (2) are fixed through a first locking screw (3); the pressure cap (4) and the pressure guide sleeve (6) are fixed through a second locking screw (5); the pressure guide sleeve (6) and the mandrel (14) are fixed through a third locking screw (10).

10. A salvaging method of a salvaging tool of a stepping releasing type underground choke is characterized by comprising the following steps

The method comprises the following steps: putting a fishing tool of the stepping releasing type underground choke down the well;

step two: when the stepping releasing type underground choke salvaging tool contacts with a choke salvaging neck, the choke salvaging neck pushes a clamping jaw (19) in the stepping releasing type underground choke salvaging tool to go upwards and expand along a locking sleeve (20) and compress a rectangular spring (17), and after the clamping jaw (19) passes through the choke salvaging neck, the clamping jaw (19) goes downwards along the locking sleeve (20) under the action of the rectangular spring (17) and contracts to capture the choke;

step three: lifting the step-by-step releasing type underground choke salvaging tool to start salvaging;

step four: when the throttler is salvaged immovably, a step-by-step releasing type underground throttler salvaging tool is lifted upwards, at the moment, the upper joint (1), the upper pull rod (2) and the fixed seat (7) move upwards, the fixed seat (7) drives the first clamp spring (8) to move upwards, and the first clamp spring (8) drives the control rod (11) to move upwards; lowering the fishing tool, enabling the upper joint (1), the upper pull rod (2), the fixed seat (7) and the first clamp spring (8) to fall down, and enabling the position of the second clamp spring (9) to be fixed and the control rod (11) to be fixed and not to move down; the process of lifting, salvaging and lowering is repeated for many times, after the preset times are reached, the control rod (11) moves upwards to a preset position, the locking block (16) enters an annular space between the lower end of the control rod (11) and the mandrel (14), the spacer ring (15) moves downwards, the compressed large spring (12) releases elasticity, the connecting block (18) is pushed to move downwards, and then the locking sleeve (20) is pushed to move downwards; the claw (19) is enlarged along the locking sleeve (20), and the fishing tool is lifted up to complete the releasing process.

Technical Field

The invention belongs to the technical field of downhole operation tools, and particularly relates to a fishing tool and a fishing method for a stepping releasing type downhole choke.

Background

The underground throttling technology is one of key technologies for developing low-pressure and low-gas production fields, has the important function of low-pressure gas collection, is generally applied at the initial production stage of a gas well, and achieves the purposes of throttling and pressure reduction production of the gas well. In the middle and later periods of gas field production, the formation water is immersed into the well casing to reduce the yield, and technological measures such as water drainage and gas production and the like such as soaking drainage, speed pipe column, plunger gas lift and the like are required to be carried out after the throttler is fished. However, in the process of exploiting the gas well, due to underground sand production, scaling, corrosion and the like, the fishing difficulty of part of well throttlers is high, and the success rate is low. If the underground throttler cannot be timely salvaged, a part of low-pressure water-producing gas wells cannot implement a drainage gas production process, so that the gas wells are low in yield or stop the well, and the throttler in a service state needs to be salvaged. If the fishing is not moved or fails, the fishing steel wire rope and the fishing tool in the well need to be taken out safely and reliably, otherwise, the fishing steel wire rope and the fishing tool fall into the well, and the fishing fails or the underground condition is complicated. In practice, safe shear pins are mostly used for releasing, but the releasing mode has the condition that the releasing is not reliable or the releasing is carried out in advance, so that a low-cost fishing tool of the underground throttle with reliable releasing is urgently needed.

Disclosure of Invention

The invention provides a step releasing type underground choke fishing tool and a fishing method, and aims to provide the underground choke fishing tool and the fishing method which can preset fishing times, are reliable in releasing and are low in cost.

In order to achieve the purpose, the invention adopts the technical scheme that:

a step releasing type fishing tool for an underground throttler comprises an upper joint, an upper pull rod, a pressing cap, a pressure guide sleeve, a fixed seat, a first clamp spring, a second clamp spring, a control rod, a large spring, an outer cylinder, a mandrel, a spacer ring, a rectangular spring, a clamping jaw and a locking sleeve; the joint, the pressing cap, the pressure guide sleeve, the outer cylinder, the clamping jaw and the locking sleeve are sequentially connected from top to bottom; the rectangular spring is sleeved between the outer cylinder and the clamping jaw; the fixed seat is connected to the inner side wall of the pressure guide sleeve; the upper end of the upper pull rod is connected with the upper part of the inner side wall of the upper joint, and the lower end of the upper pull rod is connected with the fixed seat; the outer side wall of the upper part of the control rod is provided with a clamping part; the fixed seat is connected with a first clamp spring and is connected with the clamping part of the control rod through the first clamp spring; the outer side wall of the upper part of the mandrel is detachably connected with the inner side wall of the lower part of the pressure guide sleeve; the large spring is sleeved on the outer side wall of the mandrel below the pressure guide sleeve; the upper end of the mandrel is fixedly connected with a second clamp spring and is connected with the control rod through the second clamp spring; the side wall of the mandrel is provided with a locking mechanism capable of moving horizontally, and two sides of the locking mechanism are respectively contacted with the inner side wall below the pressure guide sleeve and the control rod; the lower part of the mandrel is connected with the clamping jaw through a connecting mechanism; the spacer ring is sleeved between the lower part of the large spring and the pressure guide sleeve.

The locking mechanism is a locking block.

The locking block is a cylindrical structure with a chamfer angle at the contact end with the pressure guide sleeve.

The connecting mechanism is a connecting block; the connecting block is an integral structure formed by two cylindrical bodies with different outer diameters; the end that the external diameter is big and dabber lateral wall fixed connection, the one end that the external diameter is little and jack catch lateral wall fixed connection.

The clamping part arranged on the outer side wall of the upper part of the control rod is a multi-stage clamping tooth; the latch is a unidirectional latch which is used for controlling the rod to move upwards only.

The upper end of the upper pull rod is detachably connected with the inner side wall of the upper part of the upper joint; the lower part of the upper pull rod is detachably connected with the fixed seat through threads.

The upper end of the upper pull rod is in threaded connection with the inner side wall of the upper part of the upper joint; the lower part of the upper pull rod is connected with the fixed seat through threads.

The pressure cap is detachably connected with the pressure guide sleeve through threads; the pressure guide sleeve is detachably connected with the mandrel through threads.

The upper joint and the upper pull rod are fixed through a first locking screw; the pressure cap and the pressure guide sleeve are fixed through a second locking screw; and the pressure guide sleeve and the mandrel are fixed through a third locking screw.

A salvaging method for a step releasing type underground choke salvaging tool comprises the following steps

The method comprises the following steps: putting a fishing tool of the stepping releasing type underground choke down the well;

step two: when the stepping releasing type underground throttler fishing tool contacts the throttler fishing neck, the throttler fishing neck pushes a clamping jaw in the stepping releasing type underground throttler fishing tool to move upwards along the locking sleeve and expand, and a rectangular spring is compressed;

step three: lifting the step-by-step releasing type underground choke salvaging tool to start salvaging;

step four: when the throttler is salvaged immovably, the step-by-step releasing type underground throttler fishing tool is lifted upwards, at the moment, the upper joint, the upper pull rod and the fixed seat move upwards, the fixed seat 7 drives the first clamp spring to move upwards, and the first clamp spring drives the control rod to move upwards; lowering the fishing tool, enabling the upper joint, the upper pull rod, the fixed seat and the first clamp spring to fall down, and enabling the position of the second clamp spring to be fixed and not to move down; the processes of lifting, salvaging and lowering are repeated for many times, after the preset times are reached, the control rod moves upwards to a preset position, the locking block enters an annular space between the lower end of the control rod and the mandrel, the spacer ring moves downwards, the compressed large spring releases elasticity to push the connecting block to move downwards, and then the locking sleeve is pushed to move downwards; the jack catch expands along the locking sleeve, and the fishing tool is lifted up to complete the releasing process.

Has the advantages that:

(1) the invention can preset the fishing frequency by adjusting the position of the control rod, the fishing process can not be suddenly released, the requirements of the gas field stepping releasing type underground choke on safe, reliable and low-cost fishing technology and economy can be met, and the invention has simple structure, convenient operation and lower cost.

(2) The invention has no safe shear pin, so the releasing is more reliable.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: 1-upper joint; 2-an upper pull rod; 3-a first locking screw; 4-pressing the cap; 5-a second locking screw; 6-pressure guide sleeve; 7-a fixed seat; 8-a first clamp spring; 9-a second clamp spring; 10-a third locking screw; 11-a control lever; 12-large spring; 13-an outer barrel; 14-a mandrel; 15-spacer ring; 16-a locking piece; 17-a rectangular spring; 18-connecting blocks; 19-a jaw; 20-a locking sleeve; 21-locking sleeve bevel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.