一种测试油气藏岩石启动压力梯度的优化方法

doi:10.11743/ogg20170118

Abstract

Abstract:

Instantaneous threshold method and dual-ends pressure balance method are commonly used to test minimum threshold pressure gradient,but they are time-consuming and hard to ensure the accuracy of measurement data.The test results of pseudo threshold pressure may be slightly higher by using method of "differential pressure-flow" under constant confining pressure.Based on the above considerations,a set of integrated experiment process is designed,and the method of unsteady threshold-pressure balance is formulated.Also the way to implement the method of "differential pressure-flow" is optimized.The accuracy of the test results is ensured by using precise equipments in the experiment process,and the process is suitable for a wide range of core permeability test of threshold pressure gradient.Test results meet the expectation when this method is applied to well cores in Tuha oilfields,and this method can become a common measurement in the lab.

Key words: effective confining pressure, minimum threshold pressure gradient, method of differential pressure-flow, method of unsteady threshold-pressure balance, low permeability gas field

CLC Number:

TE37

Zhu Weiyao, Tian Wei, Zhu Huayin, Song Zhiyong, Sun Yan. An optimization method to measure rock threshold pressure gradient of oil and gas reservoirs[J]. Oil & Gas Geology, 2017, 38(1): 175-180,196.

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An optimization method to measure rock threshold pressure gradient of oil and gas reservoirs

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