考虑启动压力梯度的致密油藏水平井裂缝干扰渗流特征  

Characteristics of fracture interference between horizontal wells in tight reservoirs considering threshold pressure gradient

作　　者：钟会影[1] 余承挚 沈文霞 毕永斌[1,2] 伊然 倪浩铭 ZHONG Huiying;YU Chengzhi;SHEN Wenxia;BI Yongbin;YI Ran;NI Haoming(Key Laboratory of Enhanced Recovery of Ministry of Education,Northeast Petroleum University,Daqing 163318,Heilongjiang,China;Nanpu Oilfield Operation Distric,PetroChina Jidong Oilfield Company,Tangshan 063005,Hebei,China;No.6 Oil Production Plant,PetroChina Daqing Oilfield Company,Daqing 163114,Heilongjiang,China;Ordos Research Institute of Energy,Peking University,Ordos 017010,Inner Mongolia,China)

机构地区：[1]东北石油大学提高采收率教育部重点实验室,黑龙江大庆163318 [2]中国石油冀东油田公司南堡油田作业区,河北唐山063005 [3]中国石油大庆油田公司第六采油厂,黑龙江大庆163114 [4]北京大学鄂尔多斯能源研究院,内蒙古鄂尔多斯017010

出　　处：《岩性油气藏》2024年第3期172-179,共8页Lithologic Reservoirs

基　　金：国家自然科学基金“考虑移动接触线特性的黏弹性流体驱油两相渗流相间微界面动力学行为研究”(编号:52374032);黑龙江省自然科学基金项目“考虑复杂裂缝系统的致密油藏渗流理论及产能分析方法研究”(编号:LH2022E023)联合资助。

摘　　要：针对致密油开发中体积压裂水平井裂缝干扰的问题,在三线性流模型的基础上,通过引入半渗透边界条件和井间干扰系数α,建立了考虑未改造区启动压力梯度的致密油藏水平井裂缝干扰渗流模型,对不同干扰情况下水平井井底压力动态及产量递减特征进行了研究。研究结果表明:(1)α越大,裂缝干扰条数越多,压力动态曲线改造区线性流持续的时间越长,改造区窜流、拟稳定流动发生得越晚;未改造区启动压力梯度越大,拟稳定流发生的时间就越早。(2)裂缝导流能力越大,主裂缝线性流出现时间越早,两井裂缝导流能力越接近,α对压力动态的影响较明显。(3)α越大,井底压力相对较低的水平井初期产量越高,至晚期后,产量下降越明显,无因次启动压力梯度越大,后期产量递减越快。(4)裂缝导流能力越小,前期阶段产量曲线越靠下,两井裂缝导流能力相近时,α对产量的干扰相对较大。In view of the problems of fracture interference between horizontal wells during volume fracturing in tight reservoir development,based on the trilinear flow model,semi permeable boundary condition and interwell interference coefficient(α)were introduced to establish fracture interference percolation model of tight reservoir horizontal wells considering threshold pressure gradient in unreformed area,and the bottomhole pressure performance and production decline characteristics of horizontal wells under different interference conditions were studied.The results show that:(1)The larger theα,the more the number of fracture interference,the longer the duration of linear flow in the pressure dynamic curve transformation area,and the later the occurrence of cross flow and quasi stable flow in the transformation area.The larger the threshold pressure gradient in the unreformed area,the earlier the occurrence of quasi stable flow.(2)The larger the fracture conductivity,the earlier the linear flow of the main fracture occurs,and the closer the fracture conductivity of two wells.The influence ofαon pressure dynamics is more obvious.(3)Horizontal wells with largerαand relatively lower bottom hole pressure have higher initial production,but in the later stage,the production decreases more significantly.The larger the dimensionless threshold pressure gradient,the faster the later production decline.(4)The smaller the fracture conductivity,the lower the production curves in the early stage.When the fracture conductivity of two wells is similar,αhas a relatively large impact on production.

关 键 词：致密油藏 井间干扰系数 启动压力梯度 裂缝导流能力 渗流特征 

分 类 号：TE319[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]