摘要
针对致密低渗气藏水平井修正等时测试井底流压难稳定、二项式曲线倒转的不足,依据该气藏水平井修正等时试井的理论,运用压力叠加原理,提出该类气藏水平井有效快速产能评价"一点法"。运用该方法对实际水平井修正等时测试资料进行分析,解释的指数式方程系数为0.98,紊流效应极弱;在气田储层参数范围内分析储层有效渗透率、水平井有效长度、储层有效厚度对水平井紊流效应压降的影响,发现紊流效应压降在总压降中占比低于1%,紊流效应可忽略,二项式产能方程可简化为层流方程。该"一点法"只需求一个产能方程系数,较大程度节省测试时间,可为致密低渗气藏水平井产能评价提供技术支撑。
The bottom hole flow pressure is difficult to be stabilized and the binomial productivity equation curve inverses for the modified isochronal test of horizontal wells in tight and low permeability gas reservoirs.According to the theoretical basis of modified isochronal test of the horizontal well of the gas reservoir,this paper proposes a new method"one-point method"for effective and rapid productivity evaluation of horizontal wells in gas reservoirs by using the pressure superposition principle.The actual horizontal well modified isochronal test data is analyzed,the exponential equation coefficient is 0.98,and the turbulence effect is very weak by using the new method.The effect of the effective permeability of the reservoir,the effective length of the horizontal well,and the storage on the turbulent effect pressure drop of the horizontal well are analyzed within the gas reservoir parameters.The turbulent effect pressure drop accounts for less than 1%of the total pressure drop,the turbulence effect is negligible,and the binomial productivity equation can be simplified to the laminar flow equation.A capacity equation coefficient is merely needed for the"one point method".This new method saves test time to a large extent,and can provide technical support for the productivity evaluation of horizontal wells in dense low permeability gas reservoirs.
作者
曹朋亮
杨小松
张一果
孟洁
李媛
李登伟
CAO Pengliang;YANG Xiaosong;ZHANG Yiguo;MENG Jie;LI Yuan;LI Dengwei(No.5 Gas Production Plant of PetroChina Changqing Oilfield Company,Ordos,Inner Mongolia 017300,China;Natural Gas Institute of Sinopec Petroleum Exploration and Production Research Institute,Beijing 100083,China;South Sudan Company of Sinopec International Exploration and Production Corporation,Beijing 100029,China)
出处
《油气井测试》
2019年第6期1-8,共8页
Well Testing
基金
长庆油田分公司第五采气厂2015年科技研发项目“苏东区块下古气藏动态特征及稳产技术研究”(2015CQ5CKY05)
关键词
致密气藏
水平井
产能方程
紊流效应
试井解释
修正等时试井
tight gas reservoir
horizontal well
productivity equation
turbulence effect
well test interpretation
modified isochronal test
