井筒与油藏耦合数值模拟技术现状与发展趋势

摘要

In this paper, the research progress of coupled wellbore and reservoir numerical simulation technique were summarized from four aspects:well lfow equations, wellbore thermal multiphase lfow calculation, multi-interval well model, extended well model iniflled near wellblock. The paper pointed some main problems:large errors in the parameters of well lfow equations, so the accurate source sink term cannot be provided;the multiphase wellbore pipe lfow at high watercut stage is very complex, so there are great errors in the commonly used computational lfuid mechanics model;the lfuid-structure coupling mechanism in non-isothermal well lfow is not clearly understood and the numerical calculation takes too long time;simulation of comingled production does not take into account the vertical heterogeneity, and the production of thin reservoirs is not in conformity with reality. The paper presents the concept that the multi-interval model and reservoir coupled numerical simulation technique based on multiphase pipe lfow calculation, extended well model and reservoir coupled numerical simulation technique and coupled lfuid-structure coupled numerical simulation technique based on sand production and wax scale in the wellbore are the future development tread.%从井流量方程、井筒内热多相管流计算、多段井模型和近井区域加密的扩展井模型等4个方面总结了井筒与油藏耦合数值模拟技术的研究进展，指出目前存在的主要问题包括：复杂结构井流量方程中参数取值误差很大，不能提供准确的源汇项；高含水阶段井筒内多相管流非常复杂，常用的计算流体力学模型误差很大；非等温井筒内流固耦合模拟机理认识不清楚，数值计算时间长；模拟多层合采时未考虑纵向非均质性，薄差油层的动用情况与实际不符。提出了基于多相管流计算的多段井模型与油藏耦合的数值模拟技术、扩展井模型与油藏耦合的数值模拟技术、考虑井筒出砂和结蜡等复杂现象的流固耦合数值模拟技术是未来的发展趋势。