摘要
砾岩油藏储层砾石含量高,具有复模态和拟双重孔隙结构特征,在开发监测和水驱开发过程中,显示出明显的非线性渗流特征,初步研究认为,砾缘缝的存在是导致这一规律的主要原因。本文设计并制作了一维和三维典型砾岩物理模型,开展了多级流量水驱实验,通过与砂岩岩芯实验结果对比,验证了砾缘缝的存在是导致砾岩应力敏感非线性渗流的主控因素,在压力梯度达到特定值时具有明显作用,且当物理模型几何形状具有层状特征时,多向受力不均匀是砾缘缝张开的另一必要条件。实验结果很好地解释了现场开发过程中非线性渗流的显示时机,揭示了层状砾岩中该现象普遍存在的油藏地质和渗流力学基础,为砾岩二次采油、三次采油优化设计提供科学指导和理论依据。
Conglomerate reservoirs have several characteristics,such as high gravel content,complex modal and quasi double porous structures.According to preliminary studies,due to the existence of gravel seam,nonlinear seepage characteristics can be observed during the development of water flooding.In this paper,one-dimensional and three-dimensional physical models of typical conglomerate were designed,multi-stage flow rate water flooding experiments were conducted.Through the comparison with sandstone cores,it is verified that the existence of gravel seam is the main factor that leads to stress-sensitive nonlinear seepage;it has a significant effect when the pressure gradient and the injection speed reach a certain value.Additionally multi-directional pressure is another necessary condition for gravel seams open.This is caused by gravel edge seam open and the same interpretation can be found in well testing.It provides a scientific fundamental for optimizing the parameters in waterflooding and polymer flooding of conglomerate reservoirs.
作者
杨龙
王朝明
吕道平
寇根
王子强
刘同敬
王佳
YANG Long;WANG Zhaoming;LYU Daoping;KOU Gen;WANG Ziqiang;LIU Tongjing;WANG Jia(Research Institute of Experiment and Detection,Xinjiang Oilfield Company, PetroChina Company Limited,Karamay 834000,China;;SINOPEC Research Institute of Petroleum Engineering,Beijing 100101,China;EOR Research Institute,China University of Petroleum(Beijing),Beijing 102249,China;Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum(Beijing),Beijing 102249,China;Jinshi Liyuan Technology Co.,Ltd.,Beijing 102200,China)
出处
《中国矿业》
北大核心
2018年第12期140-144,共5页
China Mining Magazine
基金
"十三五"国家科技重大专项课题"低渗-致密油藏高效提高采收率新技术"资助(编号:2017ZX05009-004)
北京市自然科学基金项目"基于数字岩芯的数字渗流基础探索研究"资助(编号:2173061)
关键词
砾岩
砂岩
物理模型
应力敏感性
conglomerate
sandstone
physical model
stress sensitivity
