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Pressure control device for perforation and fracturing test system

A technology of pressure control and testing system, which is applied in the direction of measurement, wellbore/well components, production fluid, etc., and can solve problems such as prone to downhole accidents, unstable annular pressure, and long switch operation time

Active Publication Date: 2016-03-16
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the switch operation time of the hydraulic control valve is relatively long, the control speed is not easy to control, and the control accuracy is not high enough, the annular pressure is still not very stable, so downhole accidents are prone to occur

Method used

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  • Pressure control device for perforation and fracturing test system

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0026] like figure 1 As shown, the embodiment of the present invention provides a pressure control device for a perforation and fracturing testing system. The perforating and fracturing testing system includes a hydraulic pump 1 and a downhole testing tool communicated with each other, wherein the pressure control device includes A needle valve 2, the needle valve 2 is arranged on the pipeline 3 between the hydraulic pump 1 and the downhole testing tool.

[0027] Because the present invention uses the needle valve 2 with relatively high adjustment accuracy to control the annular pressure, thereby ensuring the stability of the annular pressure between the pipe s...

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Abstract

The invention discloses a pressure control device of a perforation fracturing test system. The perforation fracturing test system comprises a hydraulic pump (1) and a downhole test tool, wherein the hydraulic pump (1) and the downhole test tool are mutually communicated. The pressure control device comprises a needle valve (2). The needle valve (2) is arranged on a pipeline (3), wherein the pipeline (3) is arranged between the hydraulic pump (1) and the downhole test tool. The pressure control device can control pressure accurately so that stable annulus pressure between a downhole tubular column and a sleeve is guaranteed.

Description

technical field [0001] The invention relates to offshore oil exploration and development technology, in particular to a pressure control device for a perforation and fracturing test system. Background technique [0002] In the process of offshore oil exploration, especially in the process of perforation fracturing test, it is very important to keep the annular pressure between the pipe string and the sleeve stable to keep the downhole test tool working normally, so as to ensure the perforation pressure. The crack test was successfully carried out. When the annular pressure changes greatly, it is easy to cause accidental closing or opening of the downhole testing tool, thus causing operational accidents. In the prior art, a hydraulic control valve is used to control the annular pressure in the perforation and fracturing test system, and the hydraulic control valve is usually installed on a high-pressure manifold such as a standpipe manifold or a choke for pressure control. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B47/00
Inventor 罗勇郭士生李三喜杨中成闫波李舜水杨进宁强严德田瑞瑞陈玲玲王梦晨
Owner CHINA NAT OFFSHORE OIL CORP
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