基于格子Boltzmann模型的裂缝性储层钻井液漏失数值模拟  

Numerical simulation on drilling fluid loss in fractured carbonate reservoirs based on generalized lattice Boltzmann model

作　　者：谭启贵 康毅力[2] 宋付权 彭浩平[1] 游利军[2] TAN Qigui;KANG Yili;SONG Fuquan;PENG Haoping;YOU Lijun(School of Petroleum and Natural Gas Engineering,Changzhou University,Changzhou 213164,China;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]常州大学石油与天然气工程学院,江苏常州213164 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《常州大学学报（自然科学版）》2024年第4期37-45,共9页Journal of Changzhou University：Natural Science Edition

基　　金：2022年常州大学科研启动资助项目(ZMF22020070);四川省科技计划资助项目(2018JY0436)。

摘　　要：针对裂缝性碳酸盐岩储层钻井过程中钻井液漏失问题,基于简化的基块-裂缝双重介质物理模型,建立了描述表征单元体(REV)尺度的基块-裂缝内钻井液漏失的格子Boltzmann数学模型,数值模拟分析了钻井液漏失过程基块-裂缝内渗流场分布,揭示了不同条件下基块-裂缝内钻井液漏失行为。模拟结果表明,裂缝性致密碳酸盐岩储层中的裂缝为主要漏失空间,基块的钻井液漏失量在低值范围内随基块孔隙度增加呈指数增加。裂缝宽度越大,平均流速越大,裂缝空间内速度分布越均匀,组合裂缝总宽度相等条件下,单条裂缝的钻井液漏失速率高于多条裂缝组合情形。研究通过格子Boltzmann方法表征钻井液漏失行为,表明该方法可较好地用于分析裂缝性介质中钻井液漏失行为和裂缝至基块的跨尺度滤失过程,研究成果可为裂缝性致密储层钻井液漏失防控及储层保护提供理论依据。Focusing on the drilling fluid loss in fractured carbonate reservoirs during drilling operation,lattice Boltzmann mathematical model was proposed to characterize the drilling fluid loss in representative elementary volume(REV)scale based on simplified matrix-fracture dual-medium physical model. Velocity distribution in matrix-fracture system with drilling fluid loss was analyzed by numerical simulation, and drilling fluid loss behavior in matrix-fracture dual-medium system was discussed under the different geological conditions. The simulation results showed that microfractures dominated the loss channels for fractured tight carbonate rocks. The loss rate of drilling fluid in matrix exponentially increased with increasing porosity at lower range. The increase in fracture width led to the increase in flow average velocity, making the velocity in the fractures more uniform. Additionally, under the condition of the same total fractures width, the lost circulation rate in matrix-fracture system consisting of only one single fracture was higher than that in multiple fractures-combined system. In this paper, the lattice Boltzmann method was introduced to characterize the drilling fluid loss, and the results indicated that drilling fluid loss in fractured reservoir and filtration process from fracture to tight matrix could be well characterized by this method. This work could provide the theoretical foundation for drilling fluid loss and formation damage prevention in fractured tight reservoirs.

关 键 词：格子BOLTZMANN模型 裂缝性碳酸盐岩 钻井液漏失 数值模拟 表征单元体尺度 漏失速率 

分 类 号：TE258[石油与天然气工程—油气井工程]