低渗透气藏生产过程中不关井求取原始地层压力  

A METHOD TO CALCULATE ORIGINAL FORMATION PRESSURE OF LOW-PERMEABILITY GAS RESERVOIRS WITHOUT SHUT-IN

作　　者：刘林松[1,2] 李闽[1] 计曙东 

机构地区：[1]西南石油大学石油工程学院 [2]中石化华北油气分公司勘探开发研究院 [3]中石化华北油气分公司采油二厂

出　　处：《钻采工艺》2017年第1期54-55,68,共3页Drilling & Production Technology

基　　金：国家重大专项示范工程项目"鄂尔多斯盆地大牛地致密低渗气田开发示范工程"(编号:2011ZX05045-04)

摘　　要：原始地层压力是气藏评价中一个非常重要的参数,一般通过投产前的关井测量方式求取。很多低渗透气藏气井,由于物性差致使压力恢复时间很长等多种因素的限制,而没能进行关井求取原始地层压力。文章在气藏物质平衡方程基础上,提出了一种生产过程中不用关井的原始地层压力确定方法,仅需要生产过程中2组给定时刻的气井日产量、井底流压和累积产气量数据,提高了气井生产时率,同时还能考虑气体偏差因子的影响。应用实例表明,该方法的计算结果与投产前的压力恢复测试结果非常接近,证实了方法的可靠性。The original formation pressure is a very important parameter for gas reservoir evaluation,and it is usually acquired by shut-in pressure build-up test before putting a well into production. However,the original formation pressure in many wells of low permeability gas reservoirs could not be obtained with the shut-in test because of multiple factors like the long pressure-buildup time resulted from poor physical properties.Based on the material balance equation,a method is put forward in this paper to calculate the original formation pressure without shut-in test during the production. This method only needs two datasets,including daily production,bottom hole flowing pressure and cumulative gas production at a given time. This method could improve the production time efficiency of the gas well due to needing no well shut-in. And the influence of gas deviation factor is considered. The application shows that the results of this method are very close to the pressure buildup test data,which demonstrates the reliability of the method presented in this paper.

关 键 词：不关井 低渗透气藏 原始地层压力 物质平衡方程 偏差因子 

分 类 号：TE37[石油与天然气工程—油气田开发工程]