溶解气对气水界面的影响的数值模拟研究  

Numerical Simulation Study for the Influences of Dissolved Gas on Gas-Water Contact in Water-Soluble Gas reservoirs

作　　者：严文德[1] 黄小亮[1] 袁迎中[1] YAN Wende;HUANG Xiaoliang;YUAN Yingzhong(Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆科技学院复杂油气田勘探开发重庆市重点实验室,重庆401331

出　　处：《重庆科技学院学报（自然科学版）》2019年第1期30-33,共4页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家自然科学基金资助项目"过量地层水影响深层凝析气相态机理及基于GE-EOS模型的相态模拟研究"(51574052);重庆市基础科学与前沿技术研究项目"基于四重介质模型的水平井压裂页岩气藏流动规律研究"(CSTC2016JCYJA0293);"压裂液对超低含水页岩气井产能影响规律研究"(CSTC2018JCYJAX0700);重庆高校创新团队建设计划项目"复杂油气田开发理论与技术"(CXTDX201601033);重庆科技学院校内科研基金项目"富含水溶气的高温高压底水气藏水侵机理研究"(CK2017ZKYB004);"多重运移机制下页岩气藏基质-裂缝传质机理及缝网流动规律研究"(CK2017ZKYB006)

摘　　要：在水溶性气藏的开采过程中,地层压力下降,水体中的溶解气释放会影响气水界面运动,进而对气藏的开发效果产生影响。通过实验获得不同压力下的水溶气含量,然后采用数值模拟技术模拟和对比不同水溶气含量下的气井见水时间、见水前气井的水锥高度、见水后非锥进区域气水界面的上升高度。结果表明,水中溶解气的释放对气水界面的影响可分为2个阶段:在气井见水前,水溶气含量越大,气井的水锥上升速度越快,气井见水时间越早;在气井见水后,水溶气含量越大,非锥进区域的气水界面上升速度越慢。水溶气释放对气藏开发的影响不可忽视,开采过程中应采取必要的防水措施。In the process of production,dissolved gas will be released from the water aquifer as formation pressure decreases,which will influence the movement of gas-water contact and development effect of gas reservoir.Water-soluble gas content under different pressure is obtained from the experiment,and then water breakthrough time,water coning height before water breakthrough,rise height of gas-water contact in the non-coning region after water breakthrough under different water-soluble gas content are researched and contrasted through numerical simulation technology.Results indicate that there are two stages for the influences of dissolved gas release on gas-water contact.Before gas well producing water,the greater the water-soluble gas content,the faster water coning in the vicinity of wellbore,the earlier water breakthrough time of the gas well.After gas well producing water,the greater the water-soluble gas content,the slower the rise of gas-water contact in the non-coning region.The influence of dissolved gas release on development of water-soluble gas reservoir can not be neglected,so necessary measures should be taken to prevent water invasion in the process of production.

关 键 词：水溶性气藏 溶解气 气水界面 数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程]