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Special tool for salvaging downhole restriction choke by means of logging cable and operation method

A technology of special tools and fishing tools, which is applied in wellbore/well parts, earthwork drilling and mining, etc., can solve the problems of high cost and low success rate of fishing, and meet the requirements of high success rate, low-cost fishing technology and economical efficiency, The effect of easy operation method

Pending Publication Date: 2018-02-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a special tool and operation method for salvaging downhole chokes with logging cables, so as to overcome the problems of high cost and low salvage success rate in the prior art

Method used

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  • Special tool for salvaging downhole restriction choke by means of logging cable and operation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 1As shown in the special tool for fishing choke for logging cables, the upper end of the fishing mechanism is connected with an air pressure control mechanism and an ignition mechanism in sequence. The ignition mechanism includes a single-core plug 01, an adapter 08, and a powder cartridge 16. The conversion The ignition rod 07 and insulating tube 06 are installed inside the connector 08, the upper end of the ignition rod 07 is connected to the single-core plug 01 and the fixing nut 02, the lower end of the conversion joint 08 is installed with a sliding sleeve 10, the lower end of the sliding sleeve 10 is installed and connected to the ignition joint 14, and the lower end of the ignition joint 14 Connect powder keg16. The pneumatic control rod mechanism includes a pressure relief valve 18 , a power conversion joint 19 , a cylinder 21 , a piston 22 , and a central rod 34 . The pressure relief valve 18 is installed on the outside of the power conversion join...

Embodiment 2

[0045] On the basis of embodiment 1, this embodiment provides a kind of figure 1 The special tool for the fishing choke of the logging cable shown in the figure, in order to avoid the situation where the tool catches the fishing neck, the ignition mechanism cannot ignite, and the fishing tool cannot be dropped, the fishing and logging cable can be lifted quickly and the safety shear pin can be cut off , to remove the fishing tool function.

Embodiment 3

[0047] On the basis of embodiment 1, this embodiment provides a kind of figure 1 As shown in the special tool for fishing choke of the logging cable, after the tool grabs the fishing neck, the ignition mechanism ignites, and the choke is not unsealed, the safety shear pin is cut off, and the tool is thrown away.

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Abstract

The invention provides a special tool for salvaging a downhole restriction choke by means of a logging cable and an operation method. A salvaging mechanism and a pneumatic pressing mechanism are integrated; a separation ring is arranged between a mandrel and a supporting pipe, and a locking sleeve and the mandrel are fixed through a shear pin; a gap is reserved between the supporting pipe and a connection block; when a salvaging tool is lowered down, and when a clamping claw is in contact with a salvaging neck of the restriction choke, the clamping claw moves upwards under an upward thrust ofthe restriction choke; damage to the tool due to extremely high impact force can be avoided by buffering of a rectangular spring; the clamping claw and the connection block can move upwards together;when the connection block touches the separation ring, the movement is stopped; at the moment, the clamping claw clamps the salvaging neck of the restriction choke under the upward thrust to completeclamping operation; and the special tool is simple in structure and relatively high in success rate.

Description

technical field [0001] The invention relates to a downhole operation tool, in particular to a special tool and an operation method for fishing a downhole choke by a logging cable. Background technique [0002] At present, gas field 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 and has the function of low-pressure acquisition. It can reduce the surface distribution cost of low-pressure and low-yield gas wells in the early stage of development by several million yuan, and is an important means for the economical and effective development of low-pressure, low-yield gas fields. Therefore, it is widely used in the initial stage of low pressure and low production gas field development. [0003] However, the production of the gas field is in the later stage, and technical measures such as drainage and gas production need to be adopted, ...

Claims

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Application Information

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IPC IPC(8): E21B31/107E21B31/12
CPCE21B31/1075E21B31/12
Inventor 李宪文张安康王治国赵鹏玉胡相君李旭梅姜勇王效明胡子见魏克颖薛晓伟白小佩王昌龄刘江波
Owner PETROCHINA CO LTD
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