致密油减氧空气吞吐开发储层伤害特征  

Study on reservoir damage characteristics of tight oil oxygen reduction air huff and puff development

作　　者：刘涛 李宜强[1,2] 刘哲宇 曹涵[1,2] 曹金鑫 黄友晴 蔡一飞 LIU Tao;LI Yiqiang;LIU Zheyu;CAO Han;CAO Jinxin;HUANG Youqing;CAI Yifei(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Petroleum Engineering Institute,China University of Petroleum,Beijing 102249,China)

机构地区：[1]油气资源与探测国家重点实验室(中国石油大学),北京102249 [2]中国石油大学石油工程学院,北京102249

出　　处：《成都理工大学学报（自然科学版）》2023年第3期324-332,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(52004305,52074318)。

摘　　要：为明确致密储层减氧空气吞吐开发过程中的储层伤害特征及多轮次吞吐累加伤害对产能的影响规律,基于一维长岩心和大型二维平板多维度物理模拟实验,开展了多轮次减氧空气吞吐实验,重点探究减氧空气滞留伤害特征。结果表明:当减氧空气滞留量大于0.11 PV时,气锁伤害显著,且储层物性越差,伤害越严重,发生伤害区域距离井口越近;随着吞吐轮次的增加,平板模型压力剖面由线性分布转为明显的三段式分布,气锁伤害部位之后模型压力偏高弹性能难以释放驱替原油,游离气驱阶段为主要采油及滞留气生成阶段。致密储层减氧空气吞吐储层伤害对原油采收率的影响受闷井时间、工作压差影响显著,闷井时间过长对原油采出程度提升作用不大但气锁伤害显著上升,适当增大吞吐工作压差有助于减氧空气储层伤害程度并提高原油采出程度。Based on one-dimensional long core and large-scale two-dimensional slab multi-dimensional physical simulation experiments,the multi-round deoxygenated air huff and puff experiment was carried out,focusing on studying the damage characteristics of deoxygenated air retention in tight reservoir during the development of deoxygenated air and exploring the law of the cumulative damage of multiple rounds of huff and puff on productivity.The results show that when the amount of deoxygenated air retention is greater than 0.11 PV,the gas lock damage is significant,resulting in worse physical properties of the reservoir,serious reservoir damage,and the damage area is closer to the wellhead.With the increase of throughput rounds,the pressure profile of the plate model changes from linear distribution to obvious three-stage distribution.The pressure of the model after the gas-locked damage site is high,and the elastic property is difficult to release the displaced crude oil.The free gas drive stage is the main stage of oil recovery and retention gas generation.In tight reservoirs,oxygen reduced air huff and huff has a significant impact on oil recovery due to boring time and working pressure difference,while long boring time has little effect on oil recovery,but gas lock damage is significantly increased.Therefore,appropriately increasing huff and huff working pressure difference is helpful to reduce the damage degree of oxygen air reservoir and improve oil recovery degree.

关 键 词：致密油藏 减氧空气吞吐 开发动态特征 储层伤害 二维物理模拟 

分 类 号：TE258[石油与天然气工程—油气井工程]