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Fishing tool with hydraulic throttle and its operating method

A technology of fishing tools and operation methods, which is applied in the direction of earthwork drilling, wellbore/well parts, etc., can solve the problems of low fishing success rate and high cost, and achieve the effect of reliable and stable structural connection, simple structure, and stable connection

Active Publication Date: 2019-01-18
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 invention is to overcome the problems of high cost and low success rate of salvage in the prior art

Method used

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  • Fishing tool with hydraulic throttle and its operating method

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Effect test

Embodiment 1

[0029] In order to overcome the problems of high cost and low success rate of salvage in the prior art, this embodiment provides a method such as figure 1 The hydraulic restrictor fishing tool shown includes a fishing mechanism, and the upper end of the fishing mechanism is sequentially connected with a hydraulic mechanism and a liquid storage mechanism. The hydraulic mechanism includes a piston 6, a push rod 7, a hydraulic cylinder 8 and a connecting seat 9, The piston 6 is connected to the upper end of the ejector rod 7, the ejector rod 7 is installed in the liquid cylinder 8, the piston 6 is in contact with the inner side of the liquid cylinder 8, the connecting seat 9 is connected to the inner side of the bottom of the liquid cylinder 8, and the connecting seat 9 and the ejector rod 7 outside contact, the liquid storage mechanism includes an upper joint 1, a piston rod 2, a nut 3, an outer cylinder 4 and a check valve 5, the upper joint 1 is connected to the upper end of th...

Embodiment 2

[0037] On the basis of Embodiment 1, this embodiment provides a hydraulic throttle fishing tool as shown in the figure. In order to make the structural connection reliable and stable, the upper joint 1 and the piston rod 2 are fixed by pins, and the The nut 3 and the outer cylinder 4 are fixed by pins.

[0038] In order to avoid the pressure of the tool during operation, the upper side wall of the outer cylinder 4 is provided with a vent hole 19, and the side wall at the lower end of the hydraulic cylinder 8 is provided with a vent hole 2 20 to ensure that the fishing process is carried out normally.

[0039] In order to prevent the hydraulic oil above the piston 6 in the hydraulic cylinder 8 from leaking, a sealing ring is provided on the outside of the piston 6 .

[0040] In order to ensure that the connection between the hydraulic cylinder 8 and the mandrel 13 is stable, the connecting seat 9, the liquid cylinder 8 and the mandrel 13 are all fixed by pins.

Embodiment 3

[0042] On the basis of embodiment 2, this embodiment provides a kind of figure 1As shown in the hydraulic throttle fishing tool, the fishing mechanism includes a spacer sleeve 11, a spring 10, a fixed sleeve 12, a mandrel 13, a shear pin 14, a rectangular spring 15, a connecting block 16, a claw 17, and a locking sleeve 18. The spacer sleeve 11 and the mandrel 13 are respectively connected to the outer side and the inner side of the lower end of the connecting seat 9. The mandrel 13 is set on the outer side of the lower part of the push rod 7. There is a spring 10 and a fixed spring between the mandrel 13 and the spacer 11. The sleeve 12, the fixed sleeve 12 and the mandrel 13 are fixed by the shear pin 14, the spring 10 is compressed and placed between the fixed sleeve 12 and the connecting seat 9, the outer side of the fixed sleeve 12 is covered with a rectangular spring 15, and the rectangular spring 15 is located in the spacer sleeve 11 below, the outer side of the lower e...

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Abstract

The invention discloses a hydraulic type salvage tool for restrictors and an operating method thereof. The hydraulic type salvage tool comprises a salvage mechanism; a hydraulic mechanism and a liquid storing mechanism are connected to the upper end of the salvage mechanism in sequence, the hydraulic mechanism comprises a piston, an ejector rob, a hydraulic cylinder and a connecting seat, and the piston is connected to the upper end of the ejector rod; the ejector rod is arranged in the hydraulic cylinder, the piston makes contact with the inner side of the hydraulic cylinder, and the connecting seat is connected to the inner side of the bottom of the hydraulic cylinder; the connecting seat makes contact with the outer side of the ejector rod, and the liquid storing mechanism comprises an upper connector, a piston rod, a nut, an outer barrel and a check valve; the upper connector is connected to the upper end of the piston rod, the nut is connected with the outer side of the piston rod in a sleeving mode, and the piston rod is arranged in the outer barrel; and the nut is connected with the upper end of the outer barrel, and the check valve is connected between the outer barrel and the hydraulic cylinder. According to the hydraulic type salvage tool for the restrictors and the operating method thereof, the problem that the current salvage success rate of downhole restrictors is low is solved, and the technological and economical salvage requirements for safety, reliability and low cost in restrictor salvage under a gas well are met.

Description

technical field [0001] The invention relates to downhole operation tools, in particular to a fishing tool with a hydraulic choke and an operating 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 production gas fields. It is widely used in the initial stage of gas well production and has an important function of low pressure collection. 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, due to downhole sand production, scaling, corrosion and other reasons, some wells have the problems of high difficulty and low success rate in salvag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/12
CPCE21B31/12
Inventor 张安康王效明赵鹏玉白小佩王治国王尚卫胡相君刘江波王昌龄李旭梅张雄涛梁万银
Owner PETROCHINA CO LTD
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