A New Method of Improving Steam Injection Profile Distribution Used in Thermal Horizontal Well and Experimental Study

摘要

During the production of thermal horizontal well, recovery ratio will be reduced by the deficiency of traditional steam injection methods, which include finite effective heating range, poor level of producing reserves etc. In order to improve efficiency of steam and well yield, a new method--multipoint steam injection technology is presented in this paper, which can improve steam injection profile distribution in thermal horizontal wells. Several factors including multiphase flow, pressure drop, variable mass flow and reservoir heterogeneity, are taken into consideration in this method. By the new technology, Steam injection string used in horizontal wells is divided into several independent units through applying matching equipments. Based on the optimization of steam absorption capacity of every unit, steam injection profile distribution is improved. The validation of multipoint steam injection technology and matching equipments are verified through ground simulation tests in this paper. Moreover, the influence of steam injection parameters is also analyzed.