Electric fishing tool of preset downhole throttler and fishing method thereof

A salvage tool and choke technology, which is applied in the field of electric salvage tools with preset downhole chokes, can solve the problems of sticking risk and high cost, and achieves reduced salvage frictional resistance, simple structure, low-cost salvage technology and economy. Effects of sexual demands

Pending Publication Date: 2020-08-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a preset type downhole choke electric fishing tool and its fishing method. The first purpose is to

Method used

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  • Electric fishing tool of preset downhole throttler and fishing method thereof
  • Electric fishing tool of preset downhole throttler and fishing method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0033] The first embodiment of the present invention relates to a preset downhole choke electric fishing tool, see figure 1 , including an upper joint 1, an outer cylinder 2, a lower joint 7, a lower pressure cap 9 and a working outer cylinder 15 sequentially connected from top to bottom, the lower end surface of the lower pressure cap 9 abuts against the pressure sleeve 11, and the outer wall of the pressure sleeve 11 A claw seat 14 is provided, and the claw seat 14 is embedded with a claw 17;

[0034] A motor 3 is installed inside the outer cylinder 2, and the hollow rotor shaft of the motor 3 is screwed with a screw 4, the lower end of the screw 4 is coaxially fixed to the center ejector rod 12, and the center ejector rod 12 is covered with a sheath 16, The outer wall of the sheath 16 is connected to the inner wall of the lower joint 7, and the lower joint 7 and the lower pressure cap 9 are fixed by the shear pin 8;

[0035] Wherein, the outer wall of the sheath 16, the in...

no. 2 approach

[0042] This embodiment relates to a preset electric fishing tool for downhole chokes, see figure 1 , including an upper joint 1, an outer cylinder 2, a lower joint 7, a lower pressure cap 9 and a working outer cylinder 15 sequentially connected from top to bottom, the lower end surface of the lower pressure cap 9 abuts against the pressure sleeve 11, and the outer wall of the pressure sleeve 11 A claw seat 14 is provided, and the claw seat 14 is embedded with a claw 17;

[0043] A motor 3 is installed in the outer cylinder 2, and the hollow rotor shaft of the motor 3 is screwed with a threaded mandrel 4. The threaded mandrel 4 is provided with a fixed seat 5 fixed on the inner wall of the outer cylinder 2. The lower end of the threaded mandrel 4 is the same as The shaft is fixed to the center mandrel 12, and the center mandrel 12 is covered with a sheath 16, the outer wall of the sheath 16 is connected with the inner wall of the lower joint 7, and the lower joint 7 and the low...

no. 3 approach

[0051] This embodiment provides a fishing method for a preset downhole choke electric fishing tool:

[0052] Connect the motor 3 through the logging cable and lower the electric fishing tool of the preset downhole choke to the top of the preset downhole choke, then lift up the electric fishing tool of the preset downhole choke, and the claw 17 grabs the preset Type downhole choke fishing neck, the motor 3 drives the center ejector 12 to move down through the screw rod 4, and the center ejector 12 is inserted into the center hole of the preset downhole choke, forcing the choke to unseal and lift the preset Downhole choke The electric fishing tool can propose a preset downhole choke.

[0053] The preset downhole choke electric fishing tool includes an upper joint 1, an outer cylinder 2, a lower joint 7, a lower pressure cap 9 and a working outer cylinder 15 connected sequentially from top to bottom, and the lower end surface of the lower pressure cap 9 abuts against The pressur...

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Abstract

The invention provides an electric fishing tool of a downhole throttler and a fishing method thereof. The electric fishing tool comprises an upper joint, an external cylinder, a lower joint, a pressing cap and a working external cylinder which are sequentially connected from top to bottom, the lower end surface of the pressing cap abuts against a pressing sleeve, a claw seat is arranged on the outer wall of the pressing sleeve in a sleeving mode, a claw is embedded into the claw seat, a motor is installed in the external cylinder, a screw rod is rotatably connected into a hollow rotor shaft ofthe motor in a penetrating mode, the screw rod is connected with a central ejecting rod, and the central ejecting rod can be inserted into a throttler to unseal the throttler. According to the electric fishing tool, power is provided relying on the forward and reverse rotation of the motor, the up-down reciprocating movement of the central ejecting rod of the throttler is driven until the centralejecting rod enters into the preset downhole throttler, and the unsealing of the preset downhole throttler in service is achieved; and an inner cavity of the external cylinder can be used as a storage space for lubricating grease, during fishing, the lubricating grease stored in the inner cavity can be squeezed between an oil pipe and the throttler, the fishing friction resistance is reduced, andthe fishing success rate is increased.

Description

technical field [0001] The invention belongs to the field of downhole operation tools, and in particular relates to a preset type downhole choke electric fishing tool and a fishing method thereof. Background technique [0002] At present, downhole throttling technology has become one of the key technologies in the development of low-pressure and low-yield gas fields. It is widely used in the initial stage of gas well production. It has an important function of low-pressure gas gathering and is an important means of economically and effectively developing low-pressure, low-yield gas fields. Therefore, the preset downhole choke is widely used in the initial stage of development of low-pressure and low-production gas fields. It is lowered into the gas well, and when the production needs, the downhole restrictor device is placed in the preset working cylinder to seal, so as to achieve the purpose of gas well throttling and pressure-reducing production. [0003] However, the pro...

Claims

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Application Information

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IPC IPC(8): E21B31/18E21B31/12E21B43/12
CPCE21B31/12E21B31/18E21B43/12
Inventor 陈晓丽张安康桂捷李旭梅巨亚锋张家富衣德强李曙华胡相君王嘉鑫李在顺
Owner PETROCHINA CO LTD
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