喇嘛甸油田层状气顶油藏注剂隔障数值模拟

Numerical simulation of barrier injection flooding for layered gas-cap reservoirs in Lamadian Oilfield

目前气顶油藏的开发主要采用注水建立隔障的方法,而注入聚合物和凝胶作为隔障来开采气顶油藏却很少。根据喇嘛甸油田层状气顶油藏的实际情况,利用注剂隔障的三维三相油气藏数值模拟软件,研究了气顶膨胀驱油、油气区同时降压开采、水隔障隔离开采、聚合物隔离开采以及凝胶隔离开采5种开发方案的开发效果。开发方案模拟分析结果表明,聚合物和凝胶是气顶油藏较好的隔障流体,其开发效果好于水隔障开发效果。当用理想模型计算到第10年时,凝胶和聚合物隔障的原油采出程度分别比水隔障的原油采出程度高4.368%和2.318%,气体的采出程度比水隔障的气体采出程度分别高15.960%和10.121%,两者油气比的下降幅度都大于水隔障油气比的下降幅度。

At present, barrier water flooding is mainly used to improve development in gas-cap reservoirs. But polymer and gel are rarely used as barrier fluids in the gas-cap reservoirs. Based on actual conditions of layered gas-cap reservoirs in Lamadian Oilfield,a 3-D three-phase numerical simulation software is used to study the effect of five different development plans: gas-cap expansion drive, depletion production of oil and gas zones simultaneously , barrier water flooding, barrier polymer flooding and barrier gel flooding. Simulation results show that the polymer and gel are the better barrier fluids for the gas-cap reservoirs compared with the barrier water flooding. Simulation on a concept model shows that at the time of 10 years, the oil recovery factors obtained by barrier gel flooding and barrier polymer flooding are 4. 368% and 2. 318% higher than that of barrier water flooding respectively, and gas recovery factors of the barrier gel flooding and barrier polymer flooding are 15.960% and 10. 121% higher than that of the barrier water injection respectively. And the decrease of gas-oil ratio of them is larger than that of the barrier water injection.