一种新型地层裂缝液固两相径向流动物理模拟方法

裂缝滤失和堵漏是油气田开发与增产改造的关键,但目前对裂缝中液固两相径向渗流缺少物理模拟研究。提出一种新型物理模拟实验方法,该方法的创新点在于基于Eascan-D光电扫描技术和MATLAB建模方法成功设计了地层裂缝径向流动模拟实验装置。该装置能更佳符合真实的地层裂缝空间形态特征、可视化模拟井眼和地层裂缝的径向流动。并通过实验分析验证了装置的可靠性,结果表明颗粒在孔喉较小处沉积并堵塞,且流速越小,堵塞效果越好;平均开度相同的模拟天然裂缝出口流量较小,说明了在解决裂缝漏失问题时需要考虑裂缝面形态特征对流体渗流的影响。实验装置对堵漏颗粒的选择与堵漏剂的堵漏效果评价,以及认识井下裂缝内液固两相流动规律有重要的指导意义。

A New Physical Modeling Method of Liquid-Solid Two-PhaseRadial Flow in Formation Fractures

Cracking and plugging are the key to oil and gas field development and stimulation. However, there is currently no physical simulation of liquid-solid two-phase radial seepage in cracks. In this paper, a new method of physical simulation experiment is proposed. The innovation of this method is that the experimental device of radial flow simulation of formation fracture is successfully designed based on Eascan-D photoelectric scanning technology and Matlab modeling method. The device can better conform to the real morphological characteristics of formation fractures and visualize the radial flow of wellbore and formation fractures. The reliability of the device is verified by experimental analysis. The results show that the particles are deposited and blocked at the smaller pore throat, and the smaller the flow velocity, the better the plugging effect; The flow rate of simulated natural fracture outlet with the same average opening is smaller, which indicates that the effect of fracture surface morphology on fluid seepage should be considered when solving the problem of fracture leakage. The experimental device has important guiding significance for the selection of plugging particles, the evaluation of plugging effect of plugging agents and the understanding of the law of liquid-solid two-phase flow in underground fractures.