Continuous cyclic drilling process applicable to air drilling

A technology of air drilling and technology, which is applied in the direction of wellbore/well parts, earthwork drilling, flushing wellbore, etc. It can solve the problems that air drilling cannot be applied, so as to avoid cross-card leakage, ensure downhole safety, and solve complex processes problem effect

Active Publication Date: 2015-07-08
SICHUAN OUXUN ENERGY ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the continuous circulation short circuit is only suitable for mud drilling, not for air drilling

Method used

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  • Continuous cyclic drilling process applicable to air drilling
  • Continuous cyclic drilling process applicable to air drilling
  • Continuous cyclic drilling process applicable to air drilling

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

[0031] Such as figure 1 As shown, a continuous cycle short circuit suitable for air drilling, it includes a short circuit body 1, a central check valve 2 arranged on the upper part of the inner cavity of the short circuit body 1, and a lateral valve provided on the side wall of the short circuit body 1. Vertical one-way valve 3, a positioning device 8 for pressing the central one-way valve 2 is also provided in the inner cavity of the short-circuit main body 1. The central one-way valve 2 includes a valve body A6 and a valve plate A7, and the valve plate A7 passes through the rotary shaft A99 Hinged on the side wall of the valve body below the valve hole, the side wall of the valve body A6 is provided with a cavity 10 matching the opening position of the valve plate A7; the valve plate A7 and the val...

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Abstract

The invention discloses a continuous cyclic drilling process applicable to air drilling. The process includes the steps: a valve plate A (7) of a center check valve (2) is provided with a sealing portion A, a valve body A (6) is provided with a sealing match portion A, a valve plate B (12) of a lateral vertical check valve (3) is provided with a sealing portion B, and a valve body B (11) is provided with a sealing match portion B. During normal drilling operation, a pipeline A is connected with the center check valve (2) to supply air to a drill stem; and when the drill stem needs to be demounted, a pipeline B is connected to the lateral vertical check valve (3) to supply air to the drill stem. The continuous cyclic drilling process applicable to air drilling has the advantages that equivalent cycling density of circulation air of a well can be effectively controlled, and stability in well pressure can be effectively maintained. Drilling time is shortened, and the continuous cyclic drilling process applicable to air drilling is significant to reduction of drilling cost.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a continuous circulation drilling technique suitable for air drilling. Background technique [0002] Oil drilling is known as the key to the oil industry, which shows the key position of drilling in the oil industry. From oil and gas exploration in the exploration stage, to the development and production of oil and gas, to the implementation of oil and gas field production enhancement measures, all must be achieved through drilling. Compared with drilling with traditional water-based drilling fluids, drilling with gas-based fluids has more advantages: it can increase the mechanical penetration rate, reduce or avoid lost circulation, prolong the life of the drill bit, reduce downhole complex accidents, reduce well completion stimulation measures, and reduce Comprehensive cost of drilling, protection of oil and gas production layers, increase of oil and gas production, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/16E21B21/08E21B21/10
Inventor 俞祖英徐著华李康健王洪杰张锐
Owner SICHUAN OUXUN ENERGY ENG TECH
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