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Gas lift switch device for gas lift leakage drilling

A switching device and gas lift technology, which are applied in wellbore/well valve device, production fluid, earthwork drilling, etc., can solve the problems of not being able to close in time, opening the gas lift valve, etc.

Pending Publication Date: 2021-03-26
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the gas lift valve is opened in advance and cannot be closed in time during the gas lift leaky drilling process, the present invention provides a gas lift switch device for gas lift leaky drilling

Method used

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  • Gas lift switch device for gas lift leakage drilling
  • Gas lift switch device for gas lift leakage drilling
  • Gas lift switch device for gas lift leakage drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A gas-lift switchgear for gas-lift leakage drilling, comprising an outer cylinder connected in sequence by an upper joint 1, a housing 10, and a lower joint 15, an inner tube 2, a sliding sleeve 4, a variable-diameter ball seat 8, Compensation sleeve 11 and storage ball cylinder 14. in:

[0038] The pipe wall of the upper joint 1 is provided with a radial through hole B17.

[0039] The inner pipe 2 is a hollow straight pipe whose outer diameter is smaller than the inner diameter of the upper joint 1. The outer periphery of the upper part of the inner pipe 2 is provided with a fixed connection structure with the inner wall of the upper joint 1, and a channel is arranged axially on the connection structure.

[0040]The sliding sleeve 4 is arranged in the annular space between the upper joint 1 and the inner pipe 2, and the sliding sleeve 4 forms an axial sliding sealing fit with the inner wall of the upper joint 1, and the sliding sleeve 4 forms a clearance fit with the ...

Embodiment 2

[0045] On the basis of embodiment 1, further include:

[0046] The upper end of the compensation sleeve 11 is provided with an inner convex edge, and the outer wall of the upper section of the reducing ball seat 8 is provided with a guide groove. Circumferential limit fit. Prevent the reducing ball seat 8 and the compensating sleeve 11 from rotating, affecting the switch cooperation of the radial through hole A16 and the radial through hole B17.

[0047] The junction of the compensating sleeve 11 and the housing 10 is provided with a key and groove structure to form an axial sliding and circumferential limiting fit. The axial rotation of the reducing ball seat 8 and the compensating sleeve 11 is further limited.

[0048] The outer periphery of the upper part of the inner pipe 2 is provided with a fixed connection structure with the inner wall of the upper joint 1. The upper part of the inner pipe 2 is radially provided with a raised step, and the step is threadedly connected...

Embodiment 3

[0055] Refer to attached figure 1 , a gas lift switchgear for gas lift leakage drilling, consisting of an upper joint 1, an inner pipe 2, a sliding sleeve 4, a variable diameter ball seat 8, a compensation sleeve 11, an outer shell 10, a storage ball cylinder 14, and a lower joint 15, and also includes Sealing ring 3, sealing ring 5, sealing ring 6, sealing ring 7, sealing ring 9, sealing ring 12, sealing ring 13, sealing ring 19, sealing ring 20. Wherein, both ends of the upper joint 1, the shell 10 and the lower joint 15 are provided with threads, and the three are connected together sequentially through the threads. A sealing ring 19 is provided between the upper joint 1 and the shell 10 . Two radial through holes B17 are provided on the pipe wall of the upper joint 1 . The inner pipe 2 is set inside the upper joint 1, and its upper end is connected with the upper joint 1 through threads. The upper part of the inner pipe 2 is provided with a raised step. Refer to the atta...

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PUM

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Abstract

The invention relates to a gas lift switch device for gas lift leakage drilling. The gas lift switch device comprises an upper connector, an inner pipe, a sliding sleeve, a reducing ball seat, a compensation sleeve, a shell, a ball storage barrel and a lower connector. The inner pipe is arranged in the upper connector, and the compensation sleeve is arranged in the lower connector; the sliding sleeve is arranged between the upper connector and the inner pipe, the lower end of the sliding sleeve is connected with the reducing ball seat, and a sealing ring is arranged between the sliding sleeveand the upper connector; the reducing ball seat is arranged in the compensation sleeve; and a ball storage cylinder is arranged in the lower connector and is fixedly connected with the shell through threads, and the upper end of the ball storage cylinder extends into the compensation sleeve. The device is opened in a ball throwing mode, and the device can be opened or closed only after ball throwing, so that the situation that the device is opened in advance and cannot be closed in time can be avoided, and the gas lift leakage drilling operation is guaranteed to be conducted normally.

Description

technical field [0001] The invention relates to a gas lift switchgear in the field of petroleum drilling tools, in particular to a gas lift switchgear for gas lift leakage drilling. Background technique [0002] Gas-lift leak-through drilling technology can protect low-pressure oil and gas reservoirs and solve the problem of lost circulation, especially for oil fields that have entered the late stage of development and have serious formation pressure depletion. Compared with conventional drilling technology, this technology adds double-walled drill pipe and gas lift valve to the drilling tool assembly. The double-walled drill pipe is used between the loss zone and the wellhead, and the ordinary drill pipe is used for the loss zone and below the loss zone, and the gas lift valve is connected to the end of the double-arm drill pipe. Double-walled drill pipe consists of an inner drill pipe and an outer drill pipe. The inner drill pipe communicates with the ordinary drill pipe...

Claims

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Application Information

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IPC IPC(8): E21B34/14E21B43/12
CPCE21B34/14E21B43/123
Inventor 赵传伟吴仲华裴学良张辉陈勇康波朱焕刚张锐左灵
Owner 中石化石油工程技术服务有限公司