存在相分离的有水气藏部分射孔井试井解释方法研究  

Research on well test data interpretation methods of partially penetrated water-bearing wells with phase redistribution

作　　者：梁海鹏[1] 张军祥[2] 邓睿[1] 罗新 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]中国石油长庆油田分公司气田开发处,陕西西安710018 [3]中国石油大庆油田分公司第四采油厂地质大队,黑龙江大庆163511

出　　处：《石油化工应用》2017年第6期24-27,50,共5页Petrochemical Industry Application

基　　金：青年科学基金项目:页岩储层原始地应力场仿真与局部人工扰动规律研究;项目编号:51304032

摘　　要：我国海相地层储层较发育,个别气藏有效厚度高达数百米,气井存在打开不完善的情况。受凝析水和地层水的影响,部分气井产出少量的水,因此在进行压力恢复的关井阶段,井筒内的流体会形成气体上升,液体下沉的气液两相分离现象,导致压力恢复曲线的形态发生异常,试井解释曲线失真,无法解释。因此有必要在渗流理论的基础之上,利用拉普拉斯数字变换的方法,推导出考虑相分离影响的气井渗流数学模型和试井解释模型,分析相分离、部分打开程度等多种因素对渗流双对数的影响,并结合西湖凹陷地区实际试井数据验证本文建立的数学模型的可靠性,对实际数据进行了精细解释。本文的理论研究大大提高了有水巨厚气藏的试井解释精度,为同类型油气藏开发提供了技术支撑。In China, reservoirs development commonly in marine stratum. Net pay thickness in individual gas reservoirs, where partial penetration was performed, can be hundreds of meters. Due to the influence of condensate water and formation water, phase redistribution phenomenon that gas rose up and liquid moved down emerged in some gas wells where a morsel of water production appeared, which made the build-up curves abnormal and distort- ed, thus, unable to be interpreted. On the basis of seepage theory and Laplace transforma- tion, a seepage mathematical model and a well test interpretation model for gas wells with phase separation considered were developed to analyze the impact of various elements such as phase separation and partial penetration on the seepage log-log plot. Using real well testdata of Xihu sag, reliability analysis of the mathematical model mentioned above was demonstrated. Theoretical research results proposed in this paper substantially improved the accuracy of well test interpretation thick water-bearing gas reservoir and laid a technical foundation of development of similar oil ＆ gas reservoirs.

关 键 词：相分离 数学模型 部分射孔 试井解释 

分 类 号：TE353[石油与天然气工程—油气田开发工程]