物质平衡-拟压力近似条件法确定气藏储量

doi:10.7623/syxb201903008

石油学报 ›› 2019, Vol. 40 ›› Issue (3): 337-349.DOI: 10.7623/syxb201903008

物质平衡-拟压力近似条件法确定气藏储量

张立侠, 郭春秋, 蒋豪, 曹光强, 陈鹏羽

中国石油勘探开发研究院北京 100083

收稿日期:2018-03-23 修回日期:2018-10-22 出版日期:2019-03-25 发布日期:2019-03-29
通讯作者: 张立侠,男,1996年4月生,2016年获东北石油大学学士学位,现为中国石油勘探开发研究院硕士研究生,主要从事油气藏工程及油气渗流力学方面的研究。Email:zhanglixia2016@petrochina.com.cn
作者简介:张立侠,男,1996年4月生,2016年获东北石油大学学士学位,现为中国石油勘探开发研究院硕士研究生,主要从事油气藏工程及油气渗流力学方面的研究。Email:zhanglixia2016@petrochina.com.cn
基金资助:
国家科技重大专项（2017ZX05030-003）资助

Gas in place determination by material balance-quasipressure approximation condition method

Zhang Lixia, Guo Chunqiu, Jiang Hao, Cao Guangqiang, Chen Pengyu

Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2018-03-23 Revised:2018-10-22 Online:2019-03-25 Published:2019-03-29

摘要/Abstract

摘要：

物质平衡法作为一种有效的手段被广泛应用于气藏储量或井控储量的确定。为简便准确地确定气藏储量，笔者从物质平衡原理出发导出了"物质平衡条件"，求解气体渗流数学模型，得到了"拟压力近似条件"。将二者结合，提出了"物质平衡-拟压力近似条件法"（MB-QAC方法）。利用该方法，通过边界控制流阶段（产量波动相较于边界作用可忽略）的生产数据便可准确地计算气藏储量。定产量、定流压以及复杂生产计划条件下的数值模拟数据以及气藏实例验证了其有效性。在生产数据记录可靠的条件下，储量计算误差一般小于5%。同时，数值模拟结果表明，动态物质平衡方程是一种近似关系，拟压力近似条件对于模拟的各种情形均成立。由于考虑了岩石和束缚水的压缩性、气井产量的波动和气体性质的变化，MB-QAC方法具有一定的理论基础，对于异常高压和正常压力系统的气藏均适用，但不适用于水体活跃的气藏。

关键词: 储量, 物质平衡, 气体渗流, 拟压力, 拟时间

Abstract:

Material balance method, as an effective tool, has been widely used to estimate gas in place or well control reserves. The material balance condition is derived from the material-balance principle, and the quasipressure approximation condition is obtained by solving the mathematical model of gas flow through porous media. On this basis, this study proposes the material balance-quasipressure approximation condition method (or MB-QAC method), so as to determine the gas reserves easily and accurately. Using the production data during the boundary dominated flow stage (i.e., the transient influence caused by changes in flowrate is negligible when compared to boundary effect), this new method can determine gas reserves accurately, and its effectiveness is verified by the simulated data for a gas well centered in a bounded circular reservoir produced at constant rate,constant bottomhole pressure,under complex production scenarios respectly, as well as a case study of gas reservoir. The calculation error for gas reserves is generally less than 5 % under the condition of reliable production data records. In addition, the numerical simulation results indicate that the dynamic material balance equation demonstrates an approximate relation, while the quasipressure approximation condition is always applicable for those simulation cases. The MB-QAC method has a rigorous theoretical basis, taking into consideration the compressibility of rock and irreducible water, and the changes in flowrate as well as gas properties, which is applicable to gas reservoirs with both abnormal high pressure and normal pressure system, but inapplicable to gas reservoirs with active water drive.

Key words: gas in place, material balance, gas flow through porous media, quasipressure, quasitime

中图分类号:

TE328

张立侠, 郭春秋, 蒋豪, 曹光强, 陈鹏羽. 物质平衡-拟压力近似条件法确定气藏储量[J]. 石油学报, 2019, 40(3): 337-349.

Zhang Lixia, Guo Chunqiu, Jiang Hao, Cao Guangqiang, Chen Pengyu. Gas in place determination by material balance-quasipressure approximation condition method[J]. Acta Petrolei Sinica, 2019, 40(3): 337-349.

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物质平衡-拟压力近似条件法确定气藏储量

Gas in place determination by material balance-quasipressure approximation condition method

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