海上低流度储层启动压力梯度测试新方法  

A new method for testing threshold pressure gradient in offshore low-mobility reservoirs

作　　者：姜洪丰 JIANG Hongfeng(Department of Exploration and Development of Zhanjiang Company,CNOOC(China)Co.,Ltd.,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司勘探开发部,广东湛江524057

出　　处：《油气井测试》2024年第5期51-55,共5页Well Testing

基　　金：中国海洋石油有限公司“十四五”重大科技项目“海上深层/超深层储层经济产能获取技术研究”(KJGG2022-0406)。

摘　　要：目前业内主要用数值计算方法和岩心实验法获取启动压力梯度,但在勘探阶段岩心资料较少,且缺少利用现有测试资料确定启动压力梯度的方法。基于地层测试资料,利用渗流力学理论和试井分析方法刻画了低渗储层中流体流动过程,建立了一种基于测试资料的启动压力梯度计算新方法,并针对性完善了现场测试工艺制度,形成了一套低流度储层测试及评价方法。该方法在南海西部WSX-1井中进行了实践,顺利完成了地层测试及储层评价,计算得到了储层启动压力梯度1.55 MPa/100 m,说明了该技术方法的可行性。研究结果对海上低流度储层勘探开发具有一定借鉴意义。Currently,the industry primarily relies on numerical calculation methods and core experiments to determine the threshold pressure gradient.However,core data is scarce during the exploration stage,and there is a lack of methods to determine the threshold pressure gradient using existing test data.Based on formation test data and applying flow mechanics theory and well test analysis,the fluid flow in low-permeability reservoirs was characterized,and a new method for calculating the threshold pressure gradient using test data was established.Additionally,the field testing procedures were optimized,forming a comprehensive method for testing and evaluating low-mobility reservoirs.This method was successfully applied in well WSX-1 in the western South China Sea,where formation testing and reservoir evaluation were completed,yielding a calculated threshold pressure gradient of 1.55 MPa/100 m.The results demonstrate the feasibility of this technique and offer valuable insights for the exploration and development of offshore low-mobility reservoirs.

关 键 词：南海油田 低流度储层 探井 地层测试 启动压力梯度 测试工艺 计算方法 

分 类 号：TE345[石油与天然气工程—油气田开发工程]