A new mathematical model for horizontal wells with variable density perforation completion in bottom water reservoirs

作     者：Dian-Fa Du Yan-Yan Wang Yan-Wu Zhao Pu-Sen Sui Xi Xia 

作者机构：School of Petroleum Engineering China University of Petroleum Sinopec Petroleum Exploration and Production Research Institute Sinopec Shengli Production Plant Shengli Oilfield Branch CompanySinopec 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2017年第14卷第2期

页      面：383-394页

核心收录：

学科分类：0820[工学-石油与天然气工程] 082001[工学-油气井工程] 08[工学] 

主　　题：Bottom water reservoirs Variable density perforation completion Inflow profile Cresting model Cumulative free-water production 

摘      要：Horizontal wells are commonly used in bottom water reservoirs,which can increase contact area between wellbores and *** are many completion methods used to control cresting,among which variable density perforation is an effective *** is difficult to evaluate well productivity and to analyze inflow profiles of horizontal wells with quantities of unevenly distributed perforations,which are characterized by different *** this paper,fluid flow in each wellbore perforation,as well as the reservoir,was analyzed.A comprehensive model,coupling the fluid flow in the reservoir and the wellbore pressure drawdown,was developed based on potential functions and solved using the numerical discrete ***,a bottom water cresting model was established on the basis of the piston-like displacement ***,bottom water cresting parameters and factors influencing inflow profile were analyzed.A more systematic optimization method was proposed by introducing the concept of cumulative free-water production,which could maintain a balance（or then a balance is achieved）between stabilizing oil production and controlling bottom water *** show that the inflow profile is affected by the perforation *** with denser perforation density at the toe end and thinner density at the heel end may obtain low production,but the water breakthrough time is *** cumulative free-water production as a parameter to evaluate perforation strategies is advisable in bottom water reservoirs.