关键词: 多分支水平井, 节点, 分析模型, 压力分布, 产量分布

Abstract: On the basis of the correlated laws of hydrodynamics and the integrated pressure system analysis method, a pressure system analysis model of the multi-lateral horizontal well was established in consideration of the interference among laterals at the bottom of main wellbore. The pressure system from formation to wellhead was divided into some sections, and the main wellbore bottom was considered as a solved node. The pressure drop of every section was solved independently with the model according to the production lift methods with permeation on the reservoir, variable mass flow in the horizontal pipe and multiphase pipe flow of bending section and vertical section. The pressure system analysis model can be used to calculate the coordinated values of production rate and pressure of the multi-lateral horizontal wellbore and production contribution of each lateral in the coordinated point and analyze the distribution of production rate and pressure along the horizontal section of each lateral. The coordinated values of production rate and the bottom pressure of three-branched horizontal well in flowing pattern were calculated with the open hole series of completion methods. The result indicates that the model is favorable for calculating the coordinated production rate and bottom hole pressure in the multi-lateral horizontal well.

Key words: multi-lateral horizontal well, nodal, analysis model, pressure distribution, production rate distribution