大牛地气田单井多次压恢试井曲线特征分析  

Mutiple pressure buildup curve analysis for Daniudi gas field

作　　者：郑荣臣[1] 贾英[1] 严谨[1] 史云清[1] ZHENG Rongchen;JIA ying;YAN jin;SHI Yunqing(SINOPEC Exploration&Production Research Institute,Beijing 100083,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《中国矿业》2020年第S01期514-518,共5页China Mining Magazine

摘　　要：大牛地气田上古生界下石盒子组为河流相沉积,储层低渗致密,直井压裂建产。为掌握储层特征和裂缝动态变化情况,典型气井投产后开展多次压恢试井,其典型双对数特征曲线表现出曲线整体下移、井储变大及裂缝导流能力增加等问题。本文分别从典型特征曲线图版纵坐标拟压差公式、井筒存储的定义及影响主要因素和目前气井渗流阶段入手,分析了典型特征曲线变化的主要原因。明确了气井的储层动态模型,提高了物性解释精度,指出了气井中后期多次压恢无法解释出压裂缝闭合和导流能力变化情况,指导了气田科学管理和高效开发。Lower Shihezi formation of late paleozoic reservoirs in DND gas field is fluvial facies deposits,which is a low-permeability reservoir.In order to master the reservoir features and dynamic change of fracture,pressure build-up tests have been conducted repeatedly in some typical gas wells after putting into production.However,the test results showed different characteristic,integral curves decline,like well storage riseand fracture conductivity increase.In this paper,the main factors affecting the wellbore storage were firstly analyzed.Then,the formula of the vertical ordinate pressure difference of the typical characteristic curve was derived.Finally,the main reasons for the change of typical characteristic curve were studied based on current gas well seepage stages.The method established in this paper can explain the reasons which affect the change of pressure build-up bilogarithmic curve,clarify different flow characteristics of different production stages,and improve the interpretation accuracy of reservoir physical properties,cannot explain the fracture closure and change of conductivity,which guides the scientific management and efficient development of gas fields.

关 键 词：致密气藏 大牛地气田 河流相 气井 压恢 

分 类 号：TE353[石油与天然气工程—油气田开发工程]