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High temperature and high pressure gas well wellhead pressure measuring adaptability discriminating method

A discriminating method, high temperature and high pressure technology, applied in wellbore/well components, surveying, earthmoving, etc., can solve problems such as poor data interpretability, unstable flow characteristics, and inability to obtain strata

Inactive Publication Date: 2015-03-11
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0004] However, the temperature obtained by the wellhead pressure measurement is the ambient temperature, which cannot be used for pressure conversion and temperature correction. Once an abnormality occurs, the unstable flow characteristics of the formation cannot be obtained, and the interpretability of the data is poor.

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Embodiment Construction

[0016] 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:

[0017] The method for judging the adaptability of wellhead pressure measurement of high-temperature and high-pressure gas wells is to measure the gas production index PI and production pressure difference ΔP of the gas well. If PI<1.25+0.6174ΔP, the wellhead pressure measurement data is available, and the wellhead pressure measurement can be used instead of the bottom hole pressure measurement.

[0018] The analysis for the method of the present invention is as follows:

[0019] Gas Well Temperature Profile Prediction

[0020] The calculation of the wellbore pressure profile of a gas well depends on the prediction of the wellbore temperature profile. In this paper, the nonlinear well temperature profile is calculated by Hasan&Kabir's unsteady wellbore temperature model, and then the wellbore pressur...

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Abstract

The invention discloses a high temperature and high pressure gas well wellhead pressure measuring adaptability discriminating method. The method is characterized by measuring a gas productivity index PI and a production pressure difference delta P of a gas well, wherein if PI is less than 1.25+0.6174delta P, the wellhead pressure measuring data is available, and the wellhead pressure measurement can be used for substituting the bottom pressure measurement; if PI is more than or equal to 1.25+0.6174delta P, the wellhead pressure measuring data is not available, and the bottom pressure measurement cannot be substituted by the wellhead pressure measurement. The method has beneficial effects that a simple rule for discriminating the dynamic normality of the wellhead pressure in a pressure restoration test is determined by studying the occurrence condition of the dynamic abnormality of a wellhead, a discrimination relation applicable to the wellhead pressure restoration test is established, and evidence is provided for selecting a test scheme.

Description

technical field [0001] The invention relates to a method for judging the adaptability of wellhead pressure measurement of a high-temperature and high-pressure gas well. Background technique [0002] For high-temperature and high-pressure gas wells, replacing bottom-hole pressure measurement with wellhead pressure measurement before water production will be an important way for safety monitoring, but some high-yield gas wells show abnormal wellhead pressure during testing. [0003] Gas reservoir characteristics such as high temperature, high pressure, high sulfur content, ultra-deep and complex production pipes lead to difficulties in downhole pressure monitoring and high safety risks. Replacing bottomhole pressure measurement with wellhead pressure measurement before water production will be an important way for safety monitoring. However, the wellhead pressure of some high-yield gas wells is abnormal during testing. Existing studies believe that the temperature effect of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06
CPCE21B47/06
Inventor 赵刚黄诚陈伟袁权欧家强陈理捷赵伊莲蒋红
Owner SOUTHWEST PETROLEUM UNIV
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