首页|Fracture sealing performance of granular lost circulation materials at elevated temperature:A theoretical and coupled CFD-DEM simulation study

Fracture sealing performance of granular lost circulation materials at elevated temperature:A theoretical and coupled CFD-DEM simulation study

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Lost circulation is a common downhole problem of drilling in geothermal and high-temperature,high-pressure(HTHP)formations.Lost circulation material(LCM)is a regular preventive and remedial mea-sure for lost circulation.However,conventional LCMs seem ineffective in high-temperature formations.This may be due to the changes in the mechanical properties of LCMs and their sealing performance under high-temperature conditions.To understand how high temperature affects the fracture sealing performance of LCMs,we developed a coupled computational fluid dynamics-discrete element method(CFD-DEM)model to simulate the behavior of granular LCMs in fractures.We summarized the literature on the effects of high temperature on the mechanical properties of LCMs and the rheological properties of drilling fluid.We conducted sensitivity analyses to investigate how changing LCM slurry properties affected the fracture sealing efficiency at increasing temperatures.The results show that high temper-ature reduces the size,strength,and friction coefficient of LCMs as well as the drilling fluid viscosity.Smaller,softer,and less frictional LCM particles have lower bridging probability and slower bridging initiation.Smaller particles tend to form dual-particle bridges rather than single-particle bridges.These result in a deeper,tighter,but unstable sealing zone.Reduced drilling fluid viscosity leads to faster and shallower sealing zones.

Geothermal well drillingHTHP formationLost circulation materialCFD-DEMFracture sealing

Chong Lin、Qi-Cong Xu、Lie-Xiang Han、Gao Li、Hai He、Hong-Ling Zhou、Ji-Ping She

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CCDC Drilling & Production Technology Research Institute,Guanghan,618300,Sichuan,China

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

College of Materials Science and Engineering,Chongqing University,Chongqing,400044,China

State Key Lab of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology),Chengdu,610059,Sichuan,China

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

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国家自然科学基金中国博士后科学基金四川省科技计划

522740092022M7235012021YJ0359

2024

10.1016/j.petsci.2023.10.002

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(1)
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