摘要
气井受井储效应影响严重,利用传统试井分析模型难以得到准确的解释结果。从试井理论入手,针对气井受井储效应严重、压恢试井曲线很难达到直线段的现象,分析实测曲线的偏离原因,从而对常规试井模型进行改进,并创新性地运用二阶导数法对试井曲线进行分析,明确井储效应影响下的压恢试井曲线具体变化情况。根据井储效应影响程度划分了两类试井解释问题,结合二阶导数分别提出了气井试井解释新方法,进而运用有限差分等方法,根据实际数据,对压力恢复值随等效时间的变化、压力恢复值随等效时间的多阶导数变化情况进行拟合。结果表明,耦合作用下得到的储层参数更准确,可以用来指导区块合理开发。
Gas wells are seriously affected by well storage effect,so it is difficult to obtain accurate interpretation results by using traditional well test analysis model.Starting from the well test theory,aiming at the phenomenon that the gas well is seriously affected by the well storage effect and it is difficult for the pressure recovery well test curve to reach the straight section,the deviation reasons of the measured curve were analyzed to improve the conventional well test model,the second derivative method was creatively used to analyze the well test curve,and the specific changes of the pressure recovery well test curve under the influence of the well storage effect were defined.According to the influence degree of well storage effect,two kinds of well test interpretation problems were divided.Combined with the second derivative,a new method of well test interpretation was proposed respectively.Then,according to the actual data,the change of pressure recovery value with equivalent time and the change of multi derivative of pressure recovery value with equivalent time were fitted by using finite difference method.The results show that the reservoir parameters obtained under the coupling effect are more accurate and can be used to guide the rational development of the block.
作者
田冷
王泽川
张春阳
王建礼
蒋丽丽
TIAN Leng;WANG Ze-chuan;ZHANG Chun-yang;WANG Jian-li;JIANG Li-li(China University of Petroleum, Beijing 102249, China;The Third Oil Production Plant of Changqing Oilfield, Yan'an 716000, China)
出处
《科学技术与工程》
北大核心
2022年第1期142-147,共6页
Science Technology and Engineering
基金
国家科技重大专项-油气重大专项(2016ZX05047-005-001)。
关键词
二阶导数
试井解释
井储效应
有限差分
second derivative
well test interpretation
well storage effect
finite difference
