低渗透油田注水开发外流水量评估方法  

Evaluating method of the water outflow for the waterflooding development of low permeability oilfields

作　　者：赵国忠[1,2] 李美芳 郑宪宝[1,2] 苗志国 王宏伟[1,2] ZHAO Guozhong;LI Meifang;ZHENG Xianbao;MIAO Zhiguo;WANG Hongwei(Exploration and Development Institute of Daqing Oilfield Co Ltd,Daqing 163712,China;Heilongjiang Provincial Key Laboratory of Reservoir Physics&Fluid Mechanics in Porous Medium,Daqing 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]黑龙江省油层物理与渗流力学重点实验室,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2020年第4期48-52,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05013006);中国石油天然气股份有限公司重大科技专项“大庆油气持续有效发展关键技术研究与应用”(2016E-0209)。

摘　　要：低渗透油田注水开发过程中,普遍具有注采比较高、地层压力保持水平较低的现象,这与物质平衡原理相悖。从水相、油相物质平衡方程和饱和度约束关系出发,重新推导了水驱油藏高于饱和压力条件下油水两相物质平衡方程;以该方程为基础,考虑地层压力不可能超过破裂压力的事实,得到了累计外流量与累计产液量地下体积之比Rep的最小值Repmin的计算公式。针对低、特低渗透油藏测压资料特点,给出了利用低渗透油藏单井地层压力计算公式及体积加权法计算油藏平均地层压力的方法,由此可算出Rep值。依据得到的Repmin和Rep可快速评估低渗透油田注水开发过程中是否存在外流水量。It is commonly observed that in the process of the waterflooding development of low-permeability oilfields are characterized by high injection-production ratio but the maintained reservoir pressures are rather lower,which is contrary to the principle of the material balance.According to the material balance equation of the water and oil phases and the saturation constraint relationship,the material balance equation of the phases was re-deduced under the condition of the pressure of the waterflooded oil reservoirs above the saturated pressure;based on such a material balance equation,considering the fact that the reservoir pressure cannot exceed the fracture pressure,the calculating formula was derived for the minimal ratio R epmin of the underground volume ratio R ep between the cumulative water outflow and the cumulative liquid production.In the light of the characteristics of the tested pressure data of the low and ultra-low permeability oil reservoirs,the calculating method of the average reservoir pressure was given by using the single-well formation pressure calculation formula and volume weighted method,and then the Rep can be calculated.Whether there is the water outflow in the process of the water injection in the low-permeability oil reservoir can be evaluated quickly by the values of Repmin and Rep.

关 键 词：物质平衡方程 外流水量 低渗透油田 平均地层压力 

分 类 号：TE319[石油与天然气工程—油气田开发工程]