射孔完井有限元模型的建立及网格划分

介绍了射孔完井中二维和三维有限元热流模型的建立及网格划分的基本方法,用热流场模拟射孔完井渗流场,用同一种导热率材料来模拟井筒和孔眼,该材料导热率相对于地层模型导热率为无限大时,能模拟整个射孔完井渗流场。该二维和三维模型,能研究射孔深度、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、渗流压力场、全井产量及产能比。并用APDL程序语言编写了二维和三维模型及网格划分的通用程序,为射孔完井优化设计及产能预测提供了实用的有限元网格模型,同时也为这方面的研究提供了简捷的方法。

FINITE ELEMENT MODELS CREATED AND MESHED IN PERFORATED COMPLETION

The basic methods of 2D, 3D finite- element thermal models created and meshed have been introduced in the paper. Simulating fluid-flow field with thermal field, the materials of well hole and perforated tunnel are simulated by the same conductivity material, the thermal conductivity is infinitely great with respect to the conductivity of formation, it can simulate the fluid-flow field of the whole perforated completion. The 2D and 3D models can be used to study the velocity in the perforated tunnel, the fluid - flow velocity of out boundary of crushed zone, fluid-flow pressure field, the flow rate of whole size well and the production rate, with or without drilling dam age and crushed zone. A general program of the meshed models has been written with APDL computer language. it provides practical FEM meshed models for the optimal design and production rate prediction of perforated completion, and also provides a brief method for the research area.