二维有限元热流模型在射孔完井中的应用研究

A STUDY ON APPLICATION OF 2-D FINITE ELEMENT HEAT FLOW MODEL TO PERFORATED WELL

文章用热流场模拟射孔完井渗流场 ,建立了射孔完井热流和裸眼完井热流有限元二维 ( 2D)模型 ,根据该模型 ,文中分析了理想情况裸眼完井模型的渗流速度场分布 ,得到了其模型出口处的线流量 (Qr) ,为射孔完井模型出口处线流量 (Qp)提供了比较基准。同时文中研究了射孔深度、有无钻井污染和压实带情况下 ,孔眼内流体流速、压实带外边界渗流速度及产能比与孔深、孔密的关系等 ,从这些研究中 ,对射孔完井得到了一些新认识 ,如孔眼内存在不渗透段 ,孔密不宜过大等 ,为研究射孔完井优化设计、产能预测等提供了理论依据。

In this paper,the 2-D finite element heat flow models of perforated well and open hole well are established by simulating the flow field of the fluids in perforated wells with heat flow field.Based on this model,the distribution of the fluid flow rate field under the condition of ideal open hole well model is analyzed and the linear flow rate ( Q r) at the exit of the model is obtained,providing a comparative datum for the linear flow rate ( Q p) at the exit of the perforated well model,and the relation between the flow rate in the perforated hole,the fluid flow rate at the outer boundary of compacted zone as well as the productivity ratio and the perforated depth and density under the condition of perforated depth and under the condition that there are (or not )compacted zone and contamination by drilling operation is studied also in the paper.Through study,some new knowledges that there is non-permeability interval in the borehole and too high density of the perforations is inadvisable are obtained,providing a theoretical basis for the optimal design of perforated completion and the productivity prediction.