含部分封闭断层油藏水驱优势渗流通道演化规律  

Evolution law of dominant flow channel of water flooding in partially enclosed fault reservoir

作　　者：曹小朋 于春磊[2] 赵文景 张民 CAO Xiaopeng;YU Chunlei;ZHAO Wenjing;ZHANG Min(Dongsheng Jinggong Petroleum Development Group Co.,Ltd.,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing City,102249,China)

机构地区：[1]中国石化胜利油田分公司东胜精攻石油开发集团股份有限公司,山东东营257000 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [3]中国石油大学(北京)石油工程学院,北京102249

出　　处：《油气地质与采收率》2024年第1期78-86,共9页Petroleum Geology and Recovery Efficiency

基　　金：中国石化股份公司课题“高含水老油田流场表征与开发优化调控技术研究”(P21017)。

摘　　要：含部分封闭断层油藏作为一种常见的油藏类型,低序级断层引起的断层部分封闭导致其与完全封闭油藏具备不同的流体渗流及剩余油分布规律。现有技术难以定量刻画整个水驱进程中油藏深部的优势渗流通道演化规律,进而影响了该类油藏的高效开发。因此,设计制作了含部分封闭断层油藏物理模型并开展水驱油实验,根据模型参数及实验结果建立数值反演模型。基于标准化过流量算法定量表征优势渗流通道,利用数值反演模型与无断层油藏优势渗流通道演化规律进行对比,揭示了含部分封闭断层油藏物理模型优势渗流通道演化规律。研究表明:断层遮挡区域采出井累积产油量较低、产油速度较慢,断层不连续处过流面积减小导致该处采出井见水最早。处于断层另一侧采出井虽初期产油量接近,但断层对注入水阻挡作用导致强阻挡区采出井分流率较高且后期产油速度最高。在无水采油期发育对驱油起积极作用的优势渗流区,该区域经过垂向均衡展布、“指状”展布发育形成油藏底部“纺锤体状”优势渗流通道。各井见水后除在强遮挡区外区域形成由注水井至生产井井底的优势渗流通道,随着注入量增大,该通道在垂向及采出井井周发育且对驱油起消极作用。与无断层油藏相比,部分封闭断层使优势渗流通道在强遮挡区发育滞后且强阻挡区注入水波及困难,导致各区域剩余油分布差异较大,集中分布于强遮挡区上部及强阻挡区断层附近。A partially enclosed fault reservoir is a common reservoir type.The partially enclosed faults caused by low-order faults lead to different fluid flow and distribution laws of remaining oil between partially enclosed fault reservoirs and completely enclosed reservoirs.Through the existing technology,it is difficult to quantitatively describe the evolution law of the dominant flow channel in the deep part of the reservoir in the whole process of water flooding,which affects the efficient development of this kind of reser-voir.Therefore,the physical model of a partially enclosed fault reservoir was designed and fabricated,and the water flooding ex-periment was carried out.The numerical inversion model was established according to the model parameters and experimental re-sults.The dominant flow channel was quantitatively characterized based on the standardized flow rate algorithm.Then,the numeri-cal inversion model was used to compare with the evolution law of the dominant flow channels in fault-free reservoirs and reveal the evolution law of the dominant flow channel in the physical model of the partially enclosed fault reservoir.The results show that the accumulative oil yield and the oil production rate of the production well in the fault-occluded area were low.The reduction of the flow area in the fault discontinuity led to the earliest breakthrough in the production well.Although the production wells on the other side of the fault had close oil production in the early stage,the blocking effect of the fault on injection water led to a higher flow di-version rate and the highest oil production rate in the late stage in the strongly fault-occluded area.During the anhydrous oil produc-tion period,a dominant flow area played a positive role in oil displacement,which developed into a spindle-shaped dominant flow channel at the bottom of the reservoir through vertical equilibrium distribution and“finger-shaped”distribution.After water produc-tion in each well,a dominant flow channel was formed from the injection we

关 键 词：部分封闭断层 水驱 优势渗流通道 物理模拟 数值反演 

分 类 号：TE341[石油与天然气工程—油气田开发工程]