MDT测压资料确定气水界面方法研究及影响因素分析  

Method of determining gas water contact from MDT pressure measurement data and influencing factors analysis

作　　者：余逸凡 YU Yifan(Shanghai Company,CNOOC(China)Co.,Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限上海分公司,上海200335

出　　处：《石油地质与工程》2022年第3期51-55,共5页Petroleum Geology and Engineering

摘　　要：利用MDT测压资料确定气水界面是一种有效的方法。流体性质相同的同一压力系统中,不同深度测得的地层压力连线理论上呈线性关系。气层中流体密度小于水密度,压力梯度存在明显差异,因此通过MDT测压资料回归气、水压力方程,两个方程的交点即为气水界面。研究认为,测压资料的质量、储层物性、厚度、有效测压点的分布位置、测压数量和过渡带都影响测压界面精度,需要对测压资料进行校正,识别并剔除异常值,对低渗透油气藏过渡带的影响还需综合考虑毛管压力等资料。It is an effective method to determine gas water contact(GWC)by using MDT pressure measurement data.In the same pressure system with the same fluid property,the formation pressure line measured at different depths is linear in theory.The fluid density in the gas reservoir is less than the water density,and there is an obvious difference in the pressure gradient.Therefore,the gas and water pressure equations are regressed through MDT pressure measurement data,and the intersection of the two equations is the GWC.The research results indicate that the quality of pressure measurement data,reservoir physical properties,thickness,distribution position of effective pressure measurement points,pressure measurement quantity and transition zone all have an influence on the accuracy of pressure measurement interface.It is necessary to correct the pressure measurement data,identify and eliminate abnormal values.Besides,the influence on the transition zone of low permeability oil and gas reservoirs also need to comprehensively consider the data such as capillary pressure.

关 键 词：MDT 气水界面 影响因素 压力梯度 

分 类 号：TE249[石油与天然气工程—油气井工程]