坪北裂缝性油藏地质建模及井网加密调整技术  

Geologic Modeling and Well Pattern Infilling Techniques for Pingbei Fractured Reservoirs

作　　者：漆智先[1] 何俊玲[1] 陈树杰[1] 金鑫[1] 

机构地区：[1]中石化江汉油田分公司勘探开发研究院,湖北武汉430223

出　　处：《石油天然气学报》2014年第6期151-154,8,共4页Journal of Oil and Gas Technology

摘　　要：坪北油田属典型的特低渗透、低压油藏,油井自然生产无产能,均采取压裂方式投产,由于压裂油井具有明显的裂缝特点,裂缝孔隙型双重介质油藏的地质建模技术一直以来是一难点,也是关系到开发调整优化的关键。以坪北油田北四区为例,在动态特征分析基础上,设计了多个裂缝概念模型,利用该模型对已开发区块开展数值模拟,通过与生产实际对比,确定了合理的裂缝模型;并结合室内试验结果,利用裂缝模型从井距、井网以及中后期井网加密调整等方面开展了研究。结果表明：坪北油田北四区合理井距为140~240m,排距为80~110m,针对早期450m×150m井网,在开发中后期应采取井间加密和“之”字形排间加密,加密调整方案预测期末采出程度达17.29%。Pingbei Oilfield belonged to a typical ultra-low permeability and low-pressure reservoir.There were no productiviry in flow production of oil wells.For the fractured wells had obvious characters of fractures,the geologic modeling of the reservoirs with fractures and porosity has long been a difficulty and the key of optimizing oilfield development.By taking the Block Bei 4of Pingbei Oilfield as an example,several conceptual models of fractured reservoirs were designed based on an analysis of dynamic performance.By using the model,a numerical simulation was made for the developed blocks,and a rational fracture model was established through comparing with actual production.A study was made on well spacing,well pattern,and well pattern infilling during the middle and late period in combination with laboratory experimental data.The results indicate that the rational well spacing for Block Bei 4of Pingbei Oilfield is 140~240m,and the rational distance between rows is 80~110m.For the early well patterns of 450m×150m,the infilling should be implemented between wells or between zigzag rows in the late period.The predicted recovery percent of reserves is 17.29%at the end of the simulated period for the infilling scenario.

关 键 词：裂缝孔隙型油藏 地质建模 井网加密 开发调整 坪北油田 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学]