页岩-液体反应及其对地应力的影响  

Shale-liquid Interaction and Its Effect on In-situ Stress

作　　者：李皋[1] 李泽 胡嵩 李明昊 李卓阳 LI Gao;LI Ze;HU Song;LI Minghao;LI Zhuoyang(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Engineering Technology Research Institute,Southwest Oil and Gas Field Company,PetroChina,Chengdu,Sichuan 610017,China;CNOOC China Limited,Tianjin Branch,Binhai New Area,Tianjin 300450,China;Development Division,Southwest Oil and Gas Field Company,PetroChina,Chengdu,Sichuan 610011,China)

机构地区：[1]油气藏地质及开发工程全国重点实验室·西南石油大学,四川成都610500 [2]中国石油西南油气田工程技术研究院,四川成都610017 [3]中海油天津分公司,天津滨海新区300450 [4]中国石油西南油气田开发事业部,四川成都610011

出　　处：《西南石油大学学报（自然科学版）》2024年第5期115-123,共9页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家科技重大专项(2016ZX05021-004)。

摘　　要：页岩地层钻完井过程中,页岩-液体反应难以避免。为研究页岩-液体反应机理及其对地应力分布的影响,选取川南地区龙马溪组页岩,开展了页岩-液体反应室内实验,明确了其反应机理及结果。在此基础上利用数值模拟技术研究了页岩-液体反应对地应力分布的影响。结果表明,页岩-液体反应将造成页岩损伤,衍生微裂缝,同时导致页岩的膨胀变形。页岩-液体反应将对应力分布状态产生影响,且影响程度与缝网复杂程度高度正相关。考虑页岩-液体反应后,压裂过程中地应力分布状态出现显著变化,并造成套管应力随页岩-液体作用时间增加,对套管变形产生影响。During drilling and completion in shale formation,shale-liquid interaction between working fluid and shale is inevitable.In order to study the mechanism of shale-liquid interaction and its effect on in-situ stress distribution,laboratory experiments of shale-liquid interaction were carried out on Longmaxi Formation shale in southern Sichuan,and the mechanism and results of the shale-liquid interaction were clarified.On this basis,the influence of shale-liquid interaction on in-situ stress distribution was studied.The results show that the shale-liquid interaction can cause shale damage,and then the micro-fracture occurs,which leads to the shale swelling.The stress distribution can be affected during shale-liquid interaction,and the more complex the fracture network,the more obvious the influence of shale-liquid interaction on stress.Due to the shale-liquid interaction,the distribution of in-situ stress changes significantly during hydraulic fracturing,and the casing stress increases with the shale-liquid interaction time.

关 键 词：页岩-液体反应 页岩膨胀变形 地应力分布状态 套管变形 

分 类 号：TE257[石油与天然气工程—油气井工程]