摘要
大庆外围薄层油藏属于三角洲外前缘席状砂沉积体系,主要为砂泥互层沉积,区块隔夹层发育差异大,存在明显的区域性,加之局部发育油水同层,造成水平井压裂投产后的开发效果差别较大。以目标区域隔夹层发育特征分析为基础,研究隔夹层发育对水平井压裂造缝的影响,建立相应的地质模型,并通过数值模拟分析隔夹层对压裂水平井开发效果的影响。研究表明,一方面隔夹层严重制约了储层垂向渗透性,压裂增产的实质是沟通层间垂向渗透能力,实现油层由‘薄’变‘厚’;另一方面对于存在油水同层或水层的区块,采用压裂控制缝高后,天然隔夹层对水层的阻挡作用有利于压裂水平井的开发。
Thin reservoir outside of Daqing belongs to sand depositional system of the front seats of the triangle,mainly interbedded sand and mud deposited large blocks of developmental differences across the mezzanine,there are significant regional,coupled with the local development of oil-water layer,resulting in a great development difference after putting into effect by fracturing for horizontal wells.Based on analysis of developing characteristics of the mezzanine to the target area,influence of the every development sandwich to seam of fracturing for horizontal well is researched,the geological model is established and effects are analyzed by numerical simulation.Studies showthat,on the one hand,across the laminated severely restricted the reservoir vertical permeability,fracture stimulation is the essence of communication between the vertical permeability layer,to achieve oil layer from the’thin’to’thick’;the other hand,the existence of oil-water layer block orwater layer,the use of fracturing to control high seam point,the blocking effectto naturalwater level of every sandwich is conducive tothe development of fractured horizontal wells.
出处
《油气井测试》
2011年第6期37-39,74-75,共3页
Well Testing
基金
国家科技重大专项:大型油气田及煤层气开发项目"复杂油气田地质与提高采收率技术"(项目编号:2009ZX05009-004-03)
关键词
隔夹层
压裂
水平井
开发效果
数值模拟
across the sandwich,fracturing,horizontal well,development results,numerical simulation
