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固井环空微间隙气体窜槽现象直接影响固井质量与油田生产,准确地描述固井环空微间隙气体窜槽的流动规律是有效控制气体窜槽的核心与“瓶颈”问题.从微观粒子运动角度出发,基于格子Boltzmann方法建立了固井环空微间隙气体粒子流动模型.选取大庆油田某区块计算模拟不同环空压差下微间隙内气体粒子流动速度分布规律,计算结果揭示了固井气窜气体粒子在微环间隙内流动的本质,为后续固井气窜问题的研究开辟新的思路.
The phenomenon of micro channel gas channeling in cementing annulus has a direct impact on the cementing quality and oilfield production. Accurately describing the flow pattern of gas channeling in the annulus with micro annulus is the core and bottleneck of effectively controlling gas channeling. Based on the movement of microscopic particles, the gas particle flow model of well space annulus micro-gap was established based on Lattice Boltzmann method.The distribution of gas particle flow velocity in the micro-gap under different annulus pressure difference was simulated in a block of Daqing Oilfield, Reveals the essence of the flow of gas gushing gas particles in the micro-ring gap, and opens up new ideas for the study of the gas channeling problems in the subsequent well cementing.