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Downhole fire extinguishing nipple for air drilling

Inactive Publication Date: 2018-01-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this kind of fire extinguishing sub is: once the valve is closed, it cannot be opened again, and it needs to be lifted and replaced before subsequent drilling, which is costly

Method used

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  • Downhole fire extinguishing nipple for air drilling
  • Downhole fire extinguishing nipple for air drilling
  • Downhole fire extinguishing nipple for air drilling

Examples

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Embodiment Construction

[0033] The present invention will be described in further detail without limitation in conjunction with the accompanying drawings and examples below.

[0034] Such as figure 1 As shown, the downhole fire extinguishing nipple for air drilling according to the embodiment of the present invention includes a cylinder body 1, a lower joint 3 fixedly connected to the lower end of the cylinder body 1, and a valve core assembly 2 arranged in an axially penetrating cylinder cavity. The upper end of the cylinder body 1 is provided with a female thread for connecting with the drill string, and the lower end of the lower joint 3 is provided with a female thread for connecting with a drill bit or an air hammer.

[0035] Such as image 3 As shown, wherein, the lower joint 3 has a lower joint inner cavity penetrating in the axial direction, and the upper end of the lower joint inner cavity is provided with a lower joint inner tapered surface 31 .

[0036] Such as figure 2 As shown, where...

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PUM

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Abstract

The invention discloses a downhole fire extinguishing nipple for air drilling. The downhole fire extinguishing nipple comprises a tube body, a lower connector fixedly connected to the lower end of thetube body, and a valve element assembly supported in an inner cavity of the tube body through a supporting structure; a lower connector inner conical surface is arranged at the upper end of an innercavity of the lower connector; the valve element assembly comprises a pressure cylinder, a valve head and a spring; the pressure cylinder comprises a cylinder body, a cylinder cover, a piston and a valve rod penetrating through the cylinder cover and fixedly connected with the piston; a rodless cavity of the pressure cylinder is filled with liquid mercury; the valve head is fixed to the lower endof the valve rod; a valve head outer conical surface matched with the lower connector inner conical surface is arranged on the upper section of the valve head, and a flow passing groove extending in the axial direction is formed in the peripheral surface of the lower section of the valve head; and one end of the spring is connected with the cylinder cover, and the other end of the spring is connected with the valve head. The downhole fire extinguishing nipple for air drilling has the capability of being opened and closed repeatedly, drilling can continue to be conducted after fire extinguishing, lifting of a drill for replacement is not needed, the time cost and the labor cost in the treatment process of a downhole burning explosion accident are reduced, the drilling efficiency is improved, and the drilling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration equipment and appliances, in particular to a downhole fire extinguishing nipple for air drilling. Background technique [0002] Air drilling is a high-efficiency drilling technology using compressed air as the circulating medium. It has many advantages such as high drilling efficiency, short drilling cycle, low overall cost, less downhole accidents, and no damage to the reservoir, so it is more and more widely used. In the process of air drilling, if the formation with combustible gas (such as natural gas, oil and other hydrocarbons) is drilled, the mixture of compressed air and combustible gas can easily reach the condition of explosion in the downhole. Under certain conditions, it will cause downhole explosion, which will lead to downhole accidents such as drilling tool burial and wellbore scrapping. [0003] The downhole fire extinguishing sub is based on the fire extinguishing...

Claims

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Application Information

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IPC IPC(8): E21B35/00E21B7/18
Inventor 朱丽红陈泽鹏黄勇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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