Current status and development tread of coupled wellbore and reservoir numerical simulation technique

In this paper, the research progress of coupled wellbore and reservoir numerical simulation technique were summarized from four aspects: well flow equations, wellbore thermal multiphase flow calculation, multi-interval well model, extended well model infilled near wellblock. The paper pointed some main problems: large errors in the parameters of well flow equations, so the accurate source sink term cannot be provided; the multiphase wellbore pipe flow at high watercut stage is very complex, so there are great errors in the commonly used computational fluid mechanics model; the fluid- structure coupling mechanism in non-isothermal well flow 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 flow calculation, extended well model and reservoir coupled numerical simulation technique and coupled fluid- structure coupled numerical simulation technique based on sand production and wax scale in the wellbore are the future development tread.