大庆外围低渗透裂缝性油层剩余油预测方法  

Remaining oil prediction method for low permeability fractured reservoir in peripheral area of Daqing

作　　者：曹洪[1] 罗立娟 李照永[1] 袁娜[1] CAO Hong;LUO Lijuan;LI Zhaoyong;YUAN Na(Exploration & Development Research Institute of Daqing Oilfield Co. Ltd.,CNPC,Daqing 163712,China;No.10 Oil Production Plant of Daqing Oilfield Co. Ltd.,CNPC,Daqing 166405,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十采油厂,黑龙江大庆166405

出　　处：《复杂油气藏》2019年第3期41-45,55,共6页Complex Hydrocarbon Reservoirs

基　　金：国家重大科技专项《大型油气田及煤层气开发》项目(编号:2017ZX05013006)

摘　　要：大庆外围扶杨油层受成岩作用影响,储层随埋藏深度的增加物性变差。在低渗透多重介质中,受启动压力梯度和部分区块裂缝的影响,存在注采井距过大而形成的井网控制不住Ⅱ型剩余油和裂缝干扰而形成的平面干扰Ⅱ型剩余油。利用坐标转换将天然裂缝性油层转化为等效各向同性油层,建立基于裂缝及非达西的油水两相渗流方程;基于流管法油水两相前缘推进理论,通过单管前缘推进方程可计算某一时间的含水率导数和含水饱和度,同时建立产量与时间关系。结合油田实际井网形式和裂缝发育状况,建立了不同渗透率级别和井网形式的渗流模板,形成了大庆外围低渗透裂缝性油层剩余油快速预测方法,可以快速量化不同类型剩余油。Because Fuyang Formation in the peripheral area of Daqing Oilfield is affected by diagenesis,the physical properties of reservoir become worse with the increase of buried depth. In the low-permeability multi-media,due to the influence of start-up pressure gradient and the fracture in some blocks,there are the type Ⅱ remaining oil uncontrolled by well pattern with too large injection-production well spacing and the plane interference type Ⅱ remaining oil caused by fracture interference. The natural fractured reservoir was transformed into equivalent isotropic reservoir by coordinate transformation,and the oil-water two-phase seepage equation was established based on fracture and non-Darcy. Based on the theory of oil-water two-phase leading edge propulsion by flow tube method,the water content derivative and water saturation at a certain time can be calculated by single-pipe leading edge propulsion equation,and the relationship between production and time can be established. According to the actual well pattern and fracture development of the oilfield,it was established a seepage template with different permeability grades and well patterns,to form a rapid description method for remaining oil in low permeability fractured reservoirs in the peripheral area of Daqing,which can quickly quantify different types of remaining oil.

关 键 词：低渗透 裂缝 扶杨油层 剩余油预测 

分 类 号：TE327[石油与天然气工程—油气田开发工程]