水驱凝析气藏地层压力计算方法

doi:10.7623/syxb201202014

石油学报 ›› 2012, Vol. 33 ›› Issue (2): 278-283.DOI: 10.7623/syxb201202014

水驱凝析气藏地层压力计算方法

吴克柳　李相方　石军太　李　骞　严必成

中国石油大学石油工程教育部重点实验室　北京　102249

收稿日期:2011-09-06 修回日期:2011-12-08 出版日期:2012-03-25 发布日期:2012-05-17
通讯作者: 吴克柳
作者简介:吴克柳，男，1985年1月生，2008毕业于中国地质大学（武汉），现为中国石油大学（北京）在读博士研究生，主要从事气田及凝析气田开发研究。
基金资助:
国家自然科学基金项目(No.50974128)资助。

A computational method for reservoir pressure of water-drive condensate gas reservoir

WU Keliu　LI Xiangfang　SHI Juntai　LI Qian　YAN Bicheng

Received:2011-09-06 Revised:2011-12-08 Online:2012-03-25 Published:2012-05-17

摘要/Abstract

摘要：

凝析气藏地层压力是计算气藏储量、评价气井产能、进行动态分析及反凝析评价等必不可少的重要参数。水驱凝析气藏的开发是气藏开发中最复杂的类型之一，在开发过程中，地层压力不断下降，凝析油析出，凝析气中水蒸汽含量增多，边、底水不断侵入，准确计算及预测地层压力就显得尤为困难及重要。通过计算考虑多孔介质吸附及毛管力影响的反凝析油，实验测试不同压力下凝析气中水蒸汽含量，根据物质平衡原理，建立了考虑多孔介质吸附、毛管力及水蒸汽影响的水驱凝析气藏物质平衡新方程，并迭代求解得到任意生产时刻地层压力。应用结果表明，考虑多孔介质吸附、毛管力及水蒸汽影响计算的地层压力，更接近实测地层压力，从而减轻了现场测试工作量。

关键词: 水驱凝析气藏, 地层压力, 物质平衡法, 多孔介质, 吸附, 毛细管力

Abstract:

Reservoir pressure of condensate gas reservoir is an indispensable parameter for calculation of gas reserves, evaluation of gas-well productivity, dynamic analysis and assessment of retrograde condensation. The development of water-drive condensate gas reservoir is ranked among the most complex types of gas reservoir development. During the process of development, an accurate calculation and prediction of reservoir pressure is particularly difficult but important because reservoir pressure declines ceaselessly, condensate oil drops out continuously with an increase of the water-vapor content in condensate gas, and the edge water invades constantly. We tested the water-vapor content in condensate gas under different pressures by calculating the retrograde gas condensate, which is influenced by adsorption of porous media and capillary pressure. According to material balance principles, a novel material-balance equation for water-drive condensate gas reservoir was established in consideration of porous-medium absorption, capillary pressure and water vapor as well, and finally reservoir pressure at any time during production could be computed by iteration. Application results show that the reservoir pressure calculated with this method gets much closer to actual reservoir pressure, which virtually reduce the workload in field testing.

Key words: water-drive condensate gas reservoir, reservoir pressure, material balance method, porous medium, adsorption, capillary pressure

吴克柳　李相方　石军太　李　骞　严必成. 水驱凝析气藏地层压力计算方法[J]. 石油学报, 2012, 33(2): 278-283.

WU Keliu　LI Xiangfang　SHI Juntai　LI Qian　YAN Bicheng. A computational method for reservoir pressure of water-drive condensate gas reservoir[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(2): 278-283.

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水驱凝析气藏地层压力计算方法

A computational method for reservoir pressure of water-drive condensate gas reservoir

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