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External differential pressure opening circulating valve

A circulating valve and differential pressure technology, which is applied in wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc., can solve the problems such as reports and on-site use precedents that have not been developed for such tools. To achieve the effect of ensuring production safety

Inactive Publication Date: 2011-05-25
CNPC GREATWALL DRILLING ENG
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  • Abstract
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Problems solved by technology

Therefore, the development of horizontal wells urgently needs the external pressure difference to open the circulation valve to improve and perfect the process string, but there has never been a report on the development of such tools and a precedent for field use

Method used

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  • External differential pressure opening circulating valve
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Embodiment Construction

[0008] As shown in the attached figure, an external pressure differential opening circulation valve is composed of an upper joint 1, a lower joint 2, an outer cylinder 3, a hydraulic cylinder sliding sleeve mechanism 4, a card mechanism 5 and a circulation channel 6. The upper joint 1 and the outer The cylinder 3, the lower joint 2 and the outer cylinder 3 are threadedly connected; the supporting card mechanism 5 is installed in the upper joint 1 and the outer cylinder 3, and the hydraulic cylinder sliding sleeve mechanism 4 is installed in the outer cylinder 3, and the outer cylinder 3 has a The circulation channel 6 is sealed by the hydraulic cylinder sliding sleeve mechanism 4 before it needs to be opened.

[0009] When the present invention works, the upper joint 1 and the lower joint 2 are respectively connected with the upper production string and the lower production string through oil pipe buckles. The invention can maintain the construction pressure in the sealing pro...

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Abstract

The invention relates to the field of integration of barefoot well completion of horizontal wells of oil and gas field development, staged fracturing and production, in particular to an external differential pressure opening circulating valve. A supporting and clamping mechanism (5) of the circulating valve is arranged in an upper adapter (1) and an outer cylinder (3); a hydraulic cylinder sliding sleeve mechanism (4) is arranged in the outer cylinder (3); and a circulating passage (6) is formed on the outer cylinder (3). The external differential pressure opening circulating valve can conveniently and safely ensure the communication between sleeve pipes, and effectively prevents other tools conveyed into an oil pipe in the production process from falling into a horizontal well section so as to guarantee the production safety of the horizontal well. The disadvantages that snubbing operation is needed and the construction risk is high in the prior art are overcome.

Description

Technical field: [0001] The invention relates to the field of an oil and gas field development horizontal well open-hole well completion, staged fracturing, and production integrated pipe string, in particular to an external pressure differential opening circulation valve. Background technique: [0002] In oil and gas field development horizontal well open-hole completion and staged fracturing, production integrated string, when the fracturing is completed and enters the production stage, it is necessary to connect the tubing and casing. The previous method is to lift the string , but the risk of construction under pressure is high. Therefore, the development of horizontal wells urgently needs the external pressure difference to open the circulation valve to improve and perfect the process string, but there has never been a report on the development of such tools and a precedent for field use. Invention content: [0003] The technical problem to be solved by the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/06E21B34/08
Inventor 李永革高远文陈德民余雷李志龙李柏惠曹忠林陈和平郭向磊张艳玲
Owner CNPC GREATWALL DRILLING ENG
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