• 油气藏评价 •

### 异常高压低渗透气藏产能评价新方法

1. 西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500
• 收稿日期:2017-11-13 出版日期:2018-12-26 发布日期:2018-12-13
• 作者简介:郭肖（1972—）,男,教授,博士生导师,复杂油气藏渗流理论与应用研究。
• 基金资助:
国家科技重大专项“高压气藏安全高效开发技术”(2011ZX05015-002)

### A new method for evaluating the productivity of abnormally high-pressure and low permeability gas reservoirs

Guo Xiao,Zhao Xianyang,Yang Hongbo

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
• Received:2017-11-13 Online:2018-12-26 Published:2018-12-13

Abstract:

At present, we cannot use the conventional gas reservoir productivity evaluation equation to accurately predict the abnormal high pressure and low permeability gas reservoir capacity. Based on this fact, we considered the actual seepage of abnormal high pressure and low permeability gas reservoirs and established a new physical model to regionalize the seepage zone of gas reservoir. By the novel pseudo pressure function and the principle of superposition, and on the basis of considering the critical radius of gas flow, high-speed non-Darcy flow of gas, pulse effect, reservoir permeability stress sensitivity and starting pressure gradient effect, a new abnormally high pressure and low permeability gas reservoir productivity equation was deduced, and the validity of equation by actual test date was tested. The results showed that the relative error between the calculation results of the conventional productivity equation and the actual capacity test results without considering the influence of seepage area and multi factors could be as high as 21.5 %. The relative error between the capacity calculation results of the new equation and the actual capacity test was less than 5 %, and with the decrease of the bottom hole flow pressure, the high velocity non-Darcy flow effect, the starting pressure gradient effect and the permeability stress sensitivity effect could lead to the serious decrease of the gas well production. However, the critical radius of gas low velocity and the effects of pulse on gas well productivity were small.

• TE328