多层非均质油藏定压驱替效率计算方法  

Calculation of displacement efficiency under constant pressure in multi-layer heterogeneous reservoirs

作　　者：赵丽莎[1,2] 李莉[2] 吴忠宝[2] 张晨朔 尹慧[3] 

机构地区：[1]北京大学,北京100871 [2]中国石油勘探开发研究院,北京100083 [3]辽河石油职业技术学院,辽宁盘锦124010

出　　处：《特种油气藏》2017年第1期101-105,共5页Special Oil & Gas Reservoirs

基　　金：中国石油重大科技专项"低品位油藏规模有效动用配套技术与对策"(2012E-3304)

摘　　要：为定量评价储层纵向非均质性对驱替效率的影响,以恒定注采压差为边界条件,推导出油井见水前后水驱前缘位置、采出端含水饱和度等随时间变化的理论公式。在此基础上,建立多层油藏总驱替效率计算方法,并应用于玉门鸭儿峡油田,计算结果由数值模型进行了验证,同时对比分析了笼统注水和分层注水因非均质性强弱不同而导致开采效果差异的原因。研究结果表明:该方法具有较高的计算精度;多层油藏分层注水驱替效率明显高于笼统注水方式,可用于非均质油藏储层精细划分和重组的定量分析。该研究成果可为油田开发中后期调整提供一定的理论指导。To assess impacts of vertical heterogeneity of reservoir formation on displacement efficiency quantitative- ly, constant differential pressure between injection and production can be used as the margin condition to derive front lines of waterflooding before and after water production. In addition, theoretical formula for changes in water saturation on production end with time can be deducted as well. In addition, calculation methods to determine over- all displacement efficiency in multilayer reservoir have been clarified. These methods have been deployed in the Yu- men Ya ＇ erxia Oilfield with relevant calculation results verified by using numerical model. Furthermore, root causes for differences in production performances induced by heterogeneity of various degrees during general water injectio- nand layered water injectionhave been analyzed. Research results show these proposed methods have relatively high computational accuracy; layered water injection inmultilayer reservoirs may have displacement efficiencies signifi- candy higher than those in the general water injection. Relevant results may be used for quantitative analysis of fine division and combination of heterogeneous reservoirs. Concerned research results may provide necessary theoretical guidance for adjustments of development programs in later stages.

关 键 词：纵向非均质性 驱替效率 定压驱替 层系划分 多层油藏 鸭儿峡油田 

分 类 号：TE341[石油与天然气工程—油气田开发工程]