大庆外围油田低渗透裂缝发育储层缝控窜流通道发育井层及方向精准判识方法  

Accurate identification method of well layer and direction of fracture controlled thief zones in low permeability fractured reservoir of Daqing peripheral oilfield

作　　者：沙宗伦[1] 姚兰[2] 李承龙[1] SHA Zonglun;YAO Lan;LI Chenglong(Exploration and Development Research Institute of PetroChina Daqing Oilfield Co Ltd,Daqing 163712,China;No.6 Oil Production Company of PetroChina Daqing Oilfield Co Ltd,Daqing 163114,China)

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]中国石油大庆油田有限责任公司第六采油厂,黑龙江大庆163114

出　　处：《大庆石油地质与开发》2022年第5期63-72,共10页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“低渗、特低渗复杂油藏规模有效动用关键技术”(2017ZX05013-006);中国石油天然气股份有限公司重大科技专项“外围油田改善开发效果及提高采收率技术研究与应用”(2016E-0209)。

摘　　要：针对已有窜流通道判识方法考虑因素不全面、不适用于裂缝发育储层的问题,按照“识裂缝、判趋势、定方向”的思路,注水井以剖面测试数据为主、采油井以全井生产数据为主,创建流度分析法识别裂缝发育井层,明确窜流层位;集成发展以隶属度区间函数、主客观组合赋权为核心的模糊数学分析法,判别注采井窜流趋势;首次建立面积井网注入水推进速度计算模型,制定小层级窜流通道判别标准,实现小层级窜流通道的有效识别。结果表明,C45区块发育各类程度窜流通道共14条,与示踪剂测试结果相近;从注入水推进速度计算结果看,误差仅为5.94%;新方法可有效解决假性窜流通道及多向连通作用影响,实现窜流通道的精准识别。研究成果可为改善大庆外围油田的资源开发效果提供技术支撑。In view of existing problems that the identification methods of thief zones do not consider all factors and are not suitable for fractured reservoirs,following the idea of “identifying fractures,determining trends and deciding directions”,water injection wells are mainly based on profile test data,and oil production wells are mainly based on whole well production data. Mobility analysis method is created to identify fractures developed well layers and determine thief zones. Fuzzy mathematical analysis method with membership interval function and subjective and objective combination weighting as the core is integrated developed to identify channeling trends of injectors and producers. Calculation model of water injected rate of areal well pattern is established for the first time to formulate the criteria for identification of sublayer-level thief zones,and to realize effective identification of sublayer-level thief zones. The determination results show totally 14 thief zones with different channeling degree in C45 block,being similar to tracer test results. Calculation of injected water advancement speed shows the error of only 5.94%.The new method can effectively mitigate the influence of pseudo thief zones and multi-directional connectivity,and realize accurate identification of thief zones. The research provides technical support for improving development effect of periphery oilfields in Daqing.

关 键 词：裂缝发育井层 小层级窜流通道 变启动压力梯度 注入水推进速度 假性窜流通道 

分 类 号：TE349[石油与天然气工程—油气田开发工程]