多场耦合作用下致密储层渗流特性研究  

STUDY ON SEEPAGE CHARACTERISTICS OF TIGHT RESERVOIRS UNDER MULTI-FIELD COUPLING

作　　者：曾治平[1] 王千军[1] 李静[2] 范婕 王昊[2] 刘晨[2] ZENG Zhiping;WANG Qianjun;LI Jing;FAN Jie;WANG Hao;LIC Chen(Research institute of exploration and development of Shengli Oilfield,Sinopec,Dongoing 257015,Shandong,China;Research Institute of Geological Mechanics and Engineering,China University of Petroleum,Qingdao 266580,Shandong,China;Vorking Statioo foc Postdoctoral Scientific Research,Shengd Oilfield,Doogying 257000,Shandong,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]中国石油大学(华东)地质力学与工程研究所,山东青岛266580 [3]胜利石油管理局博士后科研工作站,山东东营257000

出　　处：《地质力学学报》2019年第6期1068-1074,共7页Journal of Geomechanics

基　　金：国家科技重大专项(2016ZX05002-002);国家自然科学基金(41972138).

摘　　要：储层岩石的渗流特性对致密砂岩储层的评价及开发具有重要意义。为此,研究构建热流固耦合控制方程,采用COMSOL Multiphyics软件,针对准噶尔盆地中部4区块某三维区致密储层不同开采时间下流体渗流速度和地层孔隙压力的分布规律开展了数值模拟研究。研究结果表明,流体渗流速度最大值出现在井口及其周围地区,断层破碎过渡带流体渗流速度高于周围连续地层和断层核部;随着与井口距离的增加,开采过程中流体渗流速度变化规律由先增加后减小最后趋于稳定逐步转化为先缓慢增加后逐步趋于稳定;在开采初期,孔隙压力等压线在井口周围呈环形分布,而后低应力区沿断层的开展方向进行扩展;孔隙压力随着开采时间的增加而不断减小,同时间节点下,距离井口越远,孔隙压力越大且下降幅度越小。研究成果为正确预测开发生产指标,为提高致密油气勘探开发效果提供技术支撑。Seepage characteristics of tight sandstone are of great significance for tight reservoir evaluation and exploitation. The fluid-solid-heat coupling control equation was built, and the COMSOL Multiphyics software was used to carry out a numerical simulation study for the distribution law of fluid seepage velocity and formation pore pressure under different production time in a 3 D tight reservoir in No.4 block of central Dzungaria Basin. The results are as follows:(1) The maximum values of fluid seepage velocity appeared in the wellhead and its surrounding areas, and the velocity of fluid seepage in the transition zone of fault breakage was higher than that in the surrounding continuous formation and nuclear part of the fault.(2) With the increase of the distance from the wellhead, the variation of fluid seepage velocity changed from increasing first, then decreasing, and finally tending to be stable to gradually increasing first, then gradually tending to be stable.(3) In the initial stage of production, the pore pressure isobar was located around the wellhead, distributed with circular line and then the low stress zone extended along the direction of the fault.(4) The pore pressure was decreasing as the production time increased, at the same time, the farther from the wellhead, the larger the pore pressure was and the smaller the decrease amplitude was. The research results provide technical support for the correct prediction of development and production indexes and improvement of exploration and development effect of tight oil and gas.

关 键 词：多场耦合 致密储层 渗流特性 孔隙压力 

分 类 号：TE319[石油与天然气工程—油气田开发工程]