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A downhole restrictor

A technology of chokes and choke parts, which is applied in the direction of mining fluids, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of inconvenient use and high cost, achieve convenient use, reduce the formation of hydrates, and improve development efficiency effect

Active Publication Date: 2018-09-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a downhole choke with automatic adjustment function to solve the high cost and inconvenient use caused by the need to regularly salvage the choke to replace the gas nozzle in the prior art with the change of downhole gas pressure and production The problem

Method used

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  • A downhole restrictor

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Embodiment Construction

[0016] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings. A specific embodiment of a downhole choke of the present invention, such as figure 1 As shown, it includes an outer jacket 1, an upper central tube 2 arranged in the outer jacket 1, a lower central tube 4, a piston 9 arranged in the upper central tube 2, and an air nozzle 8, and the air nozzle 8 forms an air outlet, a sealing mechanism 5, an upper stop Ring 16, lower retaining ring 18, rubber sleeve 17 and drain sleeve 11, the upper and lower central tubes and outer casing 1 form the shell, the piston 9 forms a floating throttling member, and the air nozzle 8 is arranged on the piston 9 and then passes through the The spring device in the upper central pipe 2 is floating up and down and assembled in the upper central pipe 2, the lower end of the upper central pipe 2 and the upper end of the lower central pipe 3 are threadedly connected to form a central pi...

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Abstract

The invention relates to an underground throttler. The underground throttler comprises a casing provided with a gas outlet, wherein a gas inlet, and a gas passage for communicating the gas inlet and the gas outlet are formed in the casing; a floating throttling component which can float according to the gas inlet pressure and is provided with a throttling component cavity is arranged inside the casing in a floating manner; the gas passage comprises a first passage formed in the casing in a direction vertical to the floating direction of the floating throttling component, and a second passage formed in the floating throttling component and communicated with the throttling component cavity; the first passage and the second passage are oppositely formed and communicated with each other; when the floating throttling component does not float, the communicated area between the first passage and the second passage is the largest; when gas pressure increases, the floating throttling component can float to reduce the communicated area between the first passage and the second passage so as to achieve throttling and pressure-reducing effects and reduce production of hydrate; when the gas pressure decreases, the floating throttling component floats to increase the communicated area between the first passage and the second passage so as to ensure flow thereof.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a downhole choke. Background technique [0002] Natural gas is a multi-component mixed gaseous fossil fuel. It is easy to form natural gas hydrate under high pressure and low temperature conditions, and natural gas hydrate is easy to block pipelines. To raise the temperature or reduce the pressure, the downhole throttling technology is often used to throttle and reduce the pressure of the natural gas in the pipeline. The downhole throttling technology is to install the throttle at the proper position of the oil pipe, so that the throttling, decompression and expansion process of natural gas occurs in the well, and at the same time, the throttled airflow is heated by the ground temperature, so that the temperature of the throttled airflow can be greatly improved. The recovery is higher than the hydrate formation temperature under the condition of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/12
CPCE21B43/12
Inventor 刘岳龙周舰张荣甫王锦昌李克智毕辰星周瑞立李璇陈旭赵润冬谭苗黄祥峰罗曦刘玉祥符伟兵
Owner CHINA PETROLEUM & CHEM CORP
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