Research On The Prediction Method Of The Inflow Performance Relationship Of Horizontal Wells And Multi-lateral Wells

The technology of horizontal well and multi-lateral horizontal well is an important means to development the oil and gas fields and enhance oil recovery at home and abroad. The study of the inflow performance relationship and capacity analysis of horizontal well and multi-lateral horizontal well,which can give full play to the level of potential of horizontal well and multi-lateral horizontal well,which can enhance the effect of oil field development. After the dynamic analysis of the Inflow and outflow performance relationship,we can be adopted to analyze the rational capacity with nodal method and to determine a reasonable system of work,and to provide a scientific and theoretical basis for the optimize design and the production engineering program.This article studies comprehensively the inflow performance relationship of horizontal wells in accordance with multi-phase flow characteristics,including the two phase flow of oil and water,the two phase flow of oil and gas and the three phase flow of oil,gas and water;and based on the method of Beggs-Brill to pressure gradient prediction of multiphase pipe flow,it study outflow performance relationship of horizontal wells according to diffirent flow patterns and use the node analysis to determine reasonable productivity. It sets up the physical model of the three branches'well using analog methods, sets up the convergence of the flow model of the three branches'well through fluid dynamic analysis,gets the pressure drop of convergence of branch flows, and discusses the impacts which the pressure drop of convergence of branch flows resistance to the entire pressure system inside the vertical tubes and horizontal tube. After analysising pressure of the multi-lateral horizontal well systemly,the oil pressure of the whole system from the reservoir to the wellhead is divided in according with the nodal analysis method into the relevant independents whose pressure drop are calculated independently,and the pressure drop of multi-lateral horizontal well is constituted and solved which forecast the outflow performance relationship and determine reasonable capacity. The inflow performance relationship of the fishbone multilateral well is setted up based on considering the three-dimensional steady flow in reservoir and the characteristics of the flow of the fishbone multilateral well;it analyses the inflow performance relationship of the fishbone multilateral well with nodal method,and discusses the feasibility about calculating productivity of the fishbone multilateral well with nodal method.