Formation damage mechanism and control strategy of the compound function of drilling fluid and fracturing fluid in shale reservoirs

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外文摘要：For the analysis of the formation damage caused by the compound function of drilling fluid and fracturing fluid,the prediction method for dynamic invasion depth of drilling fluid is developed considering the fracture extension due to shale minerals erosion by oil-based drilling fluid.With the evaluation for the damage of natural and hydraulic fractures caused by mechanical properties weakening of shale fracture surface,fracture closure and rock powder blocking,the formation damage pattern is proposed with consideration of the compound effect of drilling fluid and fracturing fluid.The formation damage mechanism during drilling and completion process in shale reservoir is revealed,and the protection measures are raised.The drilling fluid can deeply invade into the shale formation through natural and induced fractures,erode shale minerals and weaken the mechanical properties of shale during the drilling process.In the process of hydraulic fracturing,the compound effect of drilling fluid and fracturing fluid further weakens the mechanical properties of shale,results in fracture closure and rock powder shedding,and thus induces stress-sensitive damage and solid blocking damage of natural/hydraulic fractures.The damage can yield significant conductivity decrease of fractures,and restrict the high and stable production of shale oil and gas wells.The measures of anti-collapse and anti-blocking to accelerate the drilling of reservoir section,forming chemical membrane to prevent the weakening of the mechanical properties of shale fracture surface,strengthening the plugging of shale fracture and reducing the invasion range of drilling fluid,optimizing fracturing fluid system to protect fracture conductivity are put forward for reservoir protection.

外文关键词：

shale oil and gasdrilling fluidfracturing fluidstress-sensitivesolid blockingformation damagereservoir protection

作者：

SUN Jinsheng、XU Chengyuan、KANG Yili、JING Haoran、ZHANG Jie、YANG Bin、YOU Lijun、ZHANG Hanshi、LONG Yifu

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作者单位：

School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China

CNPC Engineering Technology R&D Company Limited,Beijing 102206,China

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in Southwest Petroleum University,Chengdu 610500,China

CNPC Engineering Technology R & D Company Limited,Beijing 102206,China

College of Energy,Chengdu University of Technology,Chengdu 610059,China

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出版年：

2024

DOI：

10.1016/S1876-3804(24)60034-0

石油勘探与开发(英文)

中国石油天然气股份有限公司勘探开发研究院中国石油集团科学技术研究院

石油勘探与开发(英文)

ISSN：2096-4803

年,卷(期)：2024.51(2)