中国石油页岩油储集层改造技术进展及发展方向

通过回顾近年来中国石油天然气股份有限公司(以下简称中国石油)页岩油储集层改造技术的发展历程,系统总结了中国石油页岩油储集层改造技术在储集层改造机理、缝控压裂技术、地质工程一体化储集层改造设计平台、低成本材料技术、大平台立体开发模式5个方面取得的主要进展。明确了目前页岩油储集层改造主体技术为以"增大缝控储量、降低施工成本、增加经济效益"为原则的高密度分段多簇缝控压裂技术体系。全面剖析页岩油储集层改造技术在立体开发、缝控压裂参数优化、重复改造、低成本改造技术4个方面面临的挑战。提出了5个方面的发展方向:(1)强化地质工程一体化研究,充分发挥储集层改造作用;(2)深化缝控改造技术,提高页岩油储量动用水平;(3)推进页岩油水平井立体开发技术实践,实现纵向多层有效动用;(4)开展页岩油水平井重复压裂技术攻关,助推缝间剩余储量高效挖潜;(5)发展低成本改造配套技术,助力油田开发降本增效。表1参44。

致密油藏储层综合评价新方法

致密油藏开发需要储层评价作为指导，但尚无一套评价方法立足于致密油开发实际。通过对大庆油田和长庆油田典型致密油储层岩心进行实验研究，运用统计学方法和数值模拟方法，优选了平均喉道半径、可动流体百分数、脆性指数、地层压力系数、启动压力梯度、原油黏度6个参数用于致密储层评价。在低渗透油藏参数评价界限基础上，补充了地层压力系数和脆性指数分类界限；提出了致密油储层综合分类评价方法，将致密储层按综合分类系数分为4类。应用结果表明，大庆油田龙西区决的扶余油层和高台予油层，长庆油田的长8、长9储层为Ⅱ-Ⅲ类储层，有一定开发潜力。

Progress and development directions of shale oil reservoir stimulation technology of China National Petroleum Corporation

By reviewing the development history of shale oil reservoir stimulation technology of PetroChina Company Limited(PetroChina),we have systematically summarized the main progress of shale oil reservoir stimulation technology of CNPC in five aspects:reservoir stimulation mechanism,fracture-controlled fracturing,geological-engineering integrated reservoir stimulation design platform,low-cost materials,and large well-pad three-dimensional development mode.It is made clear that the major stimulation technology for shale oil reservoir is the high density multi-cluster and fracture-controlled staged fracturing aiming to increase fracture-controlled reserves,lower operation costs and increase economic benefits.Based on comprehensive analysis of the challenges shale oil reservoir stimulation technology faces in three-dimensional development,stimulation parameter optimization for fracture-controlled fracturing,refracturing and low-cost stimulation technology,we proposed five development directions of the stimulation technology:(1)Strengthen the research on integration of geology and engineering to make full use of reservoir stimulation.(2)Deepen the study on fracture-controlled fracturing to improve reserves development degree.(3)Promote horizontal well three-dimensional development of shale oil to realize the production of multiple layers vertically.(4)Research refracturing technology of shale oil reservoir through horizontal well to efficiently tap the remaining reserves between fractures.(5)Develop low-cost stimulation supporting technology to help reduce the cost and increase economic benefit of oilfield development.

致密油储层孔喉微观结构表征技术研究进展

致密油储层中孔隙是储集油气的空间与渗流发生的主要场所,且其孔隙分布呈现多种尺度,储层微观孔隙结构精确表征是非常规油气研究的重点与难点。对目前致密油储层孔隙结构表征技术进行了分类,总结了实验数据分析技术、图像分析技术与数字岩心技术的内涵及发展,并指出了其测试孔隙大小范围和优缺点;展望了致密油储层微观孔隙结构表征技术的发展趋势。