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Research and Application Status of Plugging Materials for Drilling Fluid
QIAO Mu, ZHU Zhongxi, YAN Kangkai
Xinjiang Oil & Gas    2025, 21 (1): 10-23.   DOI: 10.12388/j.issn.1673-2677.2025.01.002
Abstract199)      PDF (5890KB)(92)       Save

Lost circulation is a common and challenging downhole complex issue in current drilling operations. It has become one of the major factors affecting drilling speed and may lead to safety incidents of different levels. By comprehensively analyzing the types and mechanisms of lost circulation,the performances of global novel plugging materials under different operating conditions,and their interactions with factors such as the wellbore and formations,this study elucidates the characteristics and mechanisms of cement,cross-linking system and metallic plugging materials,granular and fiber lost circulation materials (LCMs),and the combination of curable materials and LCMs. The application performances and pros and cons of different types of LCMs for lost circulation in various formations are summarized. The results indicate that given both the treatment success rate and cost-effectiveness,cement plugging materials are preferred for handling fluid loss caused by the highly permeable rock matrix,with a treatment success rate of 91%. To address the karst-cavern thief zone,curable materials with LCMs are relatively favored,delivering a treatment success rate of 89%. Fiber LCMs are preferred for treating natural fracture-type lost circulation,with a treatment success rate of 75%. When dealing with the induced fracture-type lost circulation,granular LCMs are favorable,with a treatment success rate of 92%. The findings of this research are of important theoretical and technical guiding significance for enhancing the plugging performance of drilling fluids and promoting the development of lost circulation plugging technology.

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