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A self-locking sliding sleeve for pressure difference opening

A sliding sleeve and self-locking technology, applied in the fields of production fluids, wellbore/well components, earthwork drilling, etc., can solve the problem of high process implementation cost, reduce process implementation cost and ensure smooth flow.

Inactive Publication Date: 2014-10-01
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages that the existing pressure-opening sliding sleeve is an imported tool and the process implementation cost is high

Method used

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  • A self-locking sliding sleeve for pressure difference opening

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Embodiment Construction

[0008] As shown in the attached figure, a self-locking sliding sleeve with differential pressure opening includes an upper joint 1, an outer cylinder 2 and a lower joint 6; There is a circulation channel, and a hydraulic cylinder sliding sleeve 3 is installed in the upper joint 1 and the outer cylinder 2. The hydraulic cylinder sliding sleeve 3 and the outer cylinder 2 are fixed and sealed by shear nails and the circulation channel is sealed. The outer side of the hydraulic cylinder sliding sleeve 3 is equipped with a spring 4 , the lower end step of the hydraulic cylinder sliding sleeve 3 is matched with the installation of the conversion pin 5, the outer end of the conversion pin 5 is stuck on the inner wall step of the outer cylinder 2, and the lower end of the spring 4 is pressed against the slope of the conversion pin 5 and is in a compressed state. When the conversion pin 5 slides to the groove at the upper end of the hydraulic cylinder sliding sleeve 3 steps, the lower e...

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Abstract

The invention relates to the technical field of horizontal well open hole completion and staged fracturing, in particular to a pressure difference opened self-locking sliding sleeve. A circulating path is formed at the upper end of the outer barrel of the self-locking sliding sleeve, a hydraulic cylinder sliding sleeve is arranged in an upper joint and the outer barrel, the hydraulic cylinder sliding sleeve and the outer barrel are fixed by shear pins and the hydraulic cylinder sliding sleeve seals the circulating path; a spring is sleeved outside the hydraulic cylinder sliding sleeve, a converting pin is matched and installed on a step at the lower end of the hydraulic cylinder sliding sleeve, the outer end of the converting pin is raised and retained at the step on the inner wall of the outer barrel, the lower end of the spring is abutted against the inclined plane of the converting pin and is compressed; and when the converting pin slides into a groove at the upper end of the step of the hydraulic cylinder sliding sleeve, the lower end of the spring can be abutted against the step at the lower end of the hydraulic cylinder sliding sleeve. The invention breaks through the monopolization of the horizontal well open hole completion and staged fracturing technology of foreign countries, lowers the process implementation cost, and overcomes the defect of high cost of process implementation because the existing pressure opened sliding sleeves belong to foreign imported tools.

Description

Technical field: [0001] The invention relates to the technical field of open-hole well completion and staged fracturing of horizontal wells, in particular to a differential pressure opening self-locking sliding sleeve. Background technique: [0002] The pressure-opening sliding sleeve currently used is an imported tool, and special personnel are assigned to operate and implement it on site. Since the staged fracturing technology for open-hole completion of horizontal wells is in its infancy, and there is no special supporting tool in China, it is necessary to develop a differential pressure opening self-locking sliding sleeve tool. Invention content: [0003] The technical problem to be solved by the present invention is to provide a differential pressure opening self-locking sliding sleeve, which can break away from the monopoly of foreign countries on open-hole completion staged fracturing technology for horizontal wells and reduce the cost of process implementation. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B34/06E21B43/26
Inventor 李永革李志龙赵丽琴汤永满郭琳曹忠林于开斌尹鸿科张艳玲朱正喜曹会杨冠科陶辉王超徐婷吴庭王焕舟
Owner CNPC GREATWALL DRILLING ENG
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