低渗气藏修正等时试井曲线异常处理新方法  

A New Method for Analysis of Modified Isochronal Well Test Abnormal Curve for Low Permeability Gas Reservoirs

作　　者：王树平 姜超 孙华超 严谨[1] 郑荣臣[1] Wang Shuping;Jiang Chao;Sun Huachao;Yan Jin;Zheng Rongchen(Petroleum Exploration and Development Research Institute of SINOPEC,Beijing 100083;SINOPEC North China E&P Company,Zhengzhou Henan 450006)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国石油化工股份有限公司华北油气分公司,河南郑州450006

出　　处：《中外能源》2023年第5期46-49,共4页Sino-Global Energy

基　　金：中国石油化工股份有限公司科技部项目“大牛地气田盒1气藏剩余气定量描述及调整方案”(编号:G5800-21-ZS-HX116)。

摘　　要：为解决低渗气藏气井压降快、压恢缓慢而导致的修正等时试井二项式产能曲线异常问题,通过分析修正等时试井测试数据解释方法原理,在不改变测试制度的前提下,对测试过程中开关井压力进行校正,建立压降和时间关系式,使关井后的压力都校正到初始地层压力值,从而避免了采用等时试井产能方法解释修正等时试井资料带来的不足。文章结合实际井测试资料进行现场分析,分别校正得到新的压降和压恢数据点,二项式产能曲线斜率为正,得到气井产能。结果表明:需对测试数据进行处理才能准确评价气井产能。本文提出的新方法满足产量、时间不变的要求,该方法通过对气井实际生产数据拟合后进行压力校正,可弥补理论的不足,同时处理方法简单,较以往方法更便捷可行。文中提出的低渗气藏修正等时试井产能二项式曲线异常处理方法,实现了对二项式产能异常曲线的有效处理。In order to solve the problem of abnormal binomial productivity curve of modified isochronal well test caused by rapid pressure drop and slow pressure recovery of gas well in low permeability gas reservoirs,the interpretation method principle of modified isochronal well test data is analyzed first,the pressure of well opening or shut-in in the testing process is corrected without changing the testing system,and the relationship between pressure drop and time is established to correct the pressure after shut-in to the initial formation pressure.Thus,the deficiency caused by using isochronal well test productivity method to interpret the modified isochronal well test data is avoided.In this paper,field analysis is carried out based on actual well test data,and new pressure drop and pressure recovery data points are obtained by correction respectively.The slope of binomial productivity curve is positive,and gas well productivity is obtained.The results show that it is necessary to process the test data to accurately evaluate the gas well productivity.The new method proposed in this paper can satisfy the requirement of constant production and time.The method can make up for the deficiency of the theory through pressure correction after ftting the actual production data of gas wells.Meanwhile,the processing method is simple and more convenient and feasible than the previous methods.The method of modifying binomial productivity anomaly for isochronal well test in the low permeability gas reservoirs is proposed in this paper,which can effectively deal with binomial productivity abnormal curve.

关 键 词：低渗气藏 产能评价 修正等时试井 产能测试资料处理 气井 

分 类 号：TE373[石油与天然气工程—油气田开发工程]