夹层对稠油底水油藏可布水平井油层厚度的影响——以秦皇岛32-6油田为例  

Influences of Interlayer on Reservoir Thickness for Horizontal Well Allocation in Heavy Oil Reservoirs with Bottom Water: A Case from Qinhuangdao 32-6 Oilfield

作　　者：张运来 张吉磊 许亚南 缪飞飞 张弛 ZHANG Yunlai;ZHANG Jilei;XU Ya nan;MIAO Feifei;ZHANG Chi(Bohai Petroleum Research Institute, Tianjin Branch, CNOOC China Limited, Tianjin 300459, China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459

出　　处：《新疆石油地质》2017年第6期729-734,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05024-004)

摘　　要：秦皇岛32-6油田是典型的海上低幅稠油底水油田,由于其构造幅度低,油层厚度小于10 m的储量比例占22%.为了高效动用此类储量,在岩心分析和夹层测井识别的基础上,采用数值模拟方法充分利用夹层较发育的特点,开展了夹层对水平井开发的影响以及水平井布井界限研究。研究结果表明,夹层渗透率与基岩渗透率比值为0.01时,夹层能有效阻挡底水的快速锥进;夹层面积为水平井泄油面积的2~3倍时,能使底水发生绕流且使储量动用程度最大化;夹层位于距油层顶面3/4油层厚度处时,可有效延缓底水锥进速度,同时扩大水驱波及体积;以累计产油量5×10~4m^3作为可布水平井的经济极限下限,海上低幅稠油底水油藏可布水平井油层厚度下限值为5 m.矿场先导试验证实了该结论的可靠性,为低幅稠油底水油藏水平井布井提供了技术支持。Qinhuangdao32-6oilfield is a typical offshore low-amplitude bottom-water heavy oil field.Oil reservoirs with the thickness of less than10m account for22%due to the low amplitude of the oilfield.To produce this kind of reserves efficiently,and based on interlayer logging identification and core analysis,the paper carries out a study on the influences of interlayer on development and well allocation limits of horizontal wells by using numerical simulation method.The study results show that interlayer can effectively block the rapid coning of bottom water when the permeability ratio of interlayer to basement is0.01;interlayer will allow bottom water to flow around and the producing degree of reserves will reach the maximum when the interlayer area is2~3times of oil drainage area in horizontal wells;interlayer willeffectively slow down the coning speed of bottom water and meanwhile will enlarge swept volume of water flooding when the interlayer is located in the position with the distance to reservoir top of3/4reservoir thickness.Taking cumulative oil production of5×104m3as the lower economic limit for horizontal well allocation,the lower limit of reservoir thickness for horizontal well allocation should be5m in offshore low-amplitude heavy oil reservoirs with bottom water.Pilot tests in fields have proved the reliability of the technology,providing technical support for horizontal well allocation in low-amplitude heavy oil reservoirs with bottom water.

关 键 词：秦皇岛32-6油田 底水油藏 稠油油藏 夹层 油层厚度 水平井布井 先导试验 

分 类 号：TE345[石油与天然气工程—油气田开发工程]