加拿大Duvernay页岩凝析气藏水平井合理井距研究  

Study on reasonable well spacing of horizontal wells in Duvernay shale condensate gas reservoir in Canada

作　　者：王金伟 侯晨虹 王涛[1] 李敬松[1] 刘汝敏[1] 魏志鹏[1] WANG Jinwei;HOU Chenhong;WANG Tao;LI Jingsong;LIU Rumin;WEI Zhipeng(China Oilfield Services Limited,Tianjin 300459,China;CNOOC Gas and Power Group,Tianjin 300459,China)

机构地区：[1]中海油田服务股份有限公司,天津300459 [2]中海石油气电集团有限责任公司,天津300459

出　　处：《石油地质与工程》2021年第4期43-47,共5页Petroleum Geology and Engineering

基　　金：“十三五”国家科技重大专项“大型油气田及煤层气开发”之子课题“规模化多元热流体热采工程技术示范”(2016ZX05058-003-009)。

摘　　要：水平井分段多簇压裂是开发页岩凝析气藏的有效手段,通过加密井网来提高地质储量动用程度的同时,往往造成钻井投资大,井间干扰严重的问题。结合微地震裂缝监测、井间干扰分析和油藏数值模拟三种方法,综合分析得出页岩凝析气藏分段压裂水平井最优井距。研究结果表明,基于微地震裂缝监测得出井距为裂缝有效半长的2倍,但在生产中存在明显的井间干扰;进一步结合精细的油藏数值模拟,得出合理井距与裂缝半长呈现良好的线性关系。当井距等于裂缝半长与缝外弱改造区之和的2倍时,能充分利用井间改造体积,并且避免井间干扰,大幅减少钻井数、节省投资,显著提高单井开发效益。研究成果为页岩凝析气藏分段多簇压裂水平井网部署提供了参考。Staged multi-cluster fracturing of horizontal wells is an effective means to develop shale condensate gas reservoir.While increasing the production degree of geological reserves by infilling well pattern,it often leads to large drilling investment and serious inter well interference.Combined with micro-seismic fracture monitoring,inter well interference analysis and reservoir numerical simulation,the optimal well spacing of staged fracturing horizontal wells in shale condensate gas reservoir is obtained.The results show that the well spacing based on micro seismic fracture monitoring is twice the effective half-length of fracture,but there is obvious inter well interference in production.Further combined with elaborate reservoir numerical simulation,a good linear relationship between reasonable well spacing and fracture half-length is obtained.When the well spacing is equal to twice the sum of half-length of fracture and the weak reconstruction region outside fracture,it can make full use of the reconstruction volume between wells,avoid the inter-well interference,greatly reduce the number of wells,save investment,and significantly improve the development benefit of single well.The research results can provide a reference for the arrangement of segmental multi-cluster fractured horizontal well pattern in shale gas condensate reservoirs.

关 键 词：页岩凝析气藏 微地震监测 井间干扰 合理井距 Duvernay页岩 

分 类 号：TE372[石油与天然气工程—油气田开发工程]