华庆油田长8超低渗透砂岩油藏水驱微观机理
投稿时间:2017-12-27  修订日期:2018-03-25  点此下载全文
引用本文:王瑞飞.华庆油田长8超低渗透砂岩油藏水驱微观机理[J].地质与勘探,2018,54(5):1053-1059
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王瑞飞 西安石油大学石油工程学院陕西西安 中国石油长庆油田分公司勘探开发研究院陕西西安 sirwrf2003@163.com 
基金项目:陕西省教育厅重点项目“致密砂岩储层层理缝表征方法及渗流-应力时变耦合机理”、中国石油科技创新基金项目(项目编号:2015D-5006-0106)、国家自然科学基金(编号:51104119)联合资助
中文摘要:为探讨超低渗透砂岩油藏水驱开发中不同级别孔隙的动用及残余油赋存等问题,对鄂尔多斯盆地华庆地区延长组长8段典型岩样开展水驱油核磁共振实验。定义区间驱油效率、驱油效率贡献,根据核磁共振T2谱形态,分弛豫时间<10ms孔隙区间、弛豫时间>10ms孔隙区间、总孔隙区间讨论饱和油状态和水驱最终状态各孔隙区间的含油饱和度、动用含油饱和度、残余油饱和度、驱油效率贡献、区间驱油效率及其与渗透率的相关关系。研究表明,渗透率<0.07×10-3μm2,原油主要赋存在弛豫时间<10ms孔隙区间;渗透率>0.07×10-3μm2,原油主要赋存在弛豫时间>10ms孔隙区间。弛豫时间>10ms孔隙,油气富集程度对渗透率更敏感。渗透率越低,弛豫时间>10ms孔隙的区间驱油效率越高,但其总体积偏低,故水驱开发早期产量高,产量递减快(弛豫时间<10ms孔隙的区间驱油效率增加缓慢),这与该类油藏水驱开发特征相吻合。无论渗透率如何低,弛豫时间>10ms孔隙区间的动用含油饱和度、驱油效率贡献始终高于弛豫时间<10ms孔隙区间。油藏水驱开发阶段,调整挖潜的对象始终在弛豫时间>10ms孔隙部分。水驱结束后,渗透率大于0.48×10-3μm2的油藏,残余油主要集中在弛豫时间>10ms孔隙;渗透率<0.48×10-3μm2的油藏,残余油主要集中在弛豫时间<10ms孔隙,这为油藏水驱开发后实施提高采收率技术指明方向。
中文关键词:水驱微观机理 区间驱油效率 驱油效率贡献 超低渗透砂岩油藏 华庆油田 鄂尔多斯盆地
 
Micromechanism of water drive of the Chang 8 ultra-low permeability sandstone reservoirs in the Huaqing oil field
Abstract:In order to discuss the producing of pores of different orders and the occurrence of residual oil in the ultra-low permeability sandstone reservoirs, the NMR experiment of water flooding was carried out in the Chang 8 section of Yanchang Formation in the Huaqing area of ??Ordos Basin. We defined the interval oil displacement efficiency and contribution of oil displacement efficiency, according to the NMR T2 spectrum, the pores were divided into <10ms pores, >10ms pores and total pores, and studied the oil saturation, producing oil saturation, residual oil saturation, contribution of displacement efficiency, interval displacement efficiency of pore interval, and their correlation with the permeability in saturated oil and water drive final state. The results show that when the permeability is less than 0.07 × 10-3μm2, the oil mainly occurs in <10ms pores. When the permeability is more than 0.07 × 10-3μm2, the crude oil appears in >10ms pores. In >10 ms pores, the degree of hydrocarbon enrichment is more sensitive to the permeability. The lower the permeability, the higher the oil displacement efficiency of >10 ms pores, but the total volume is lower. Therefore, the production is high in the early stage of waterflooding exploitation, and the production decreases faster (<10ms interval increase of oil displacement efficiency is slow). This matches the characteristics of waterflooding development. No matter how low the permeability, the producing oil saturation and the contribution of displacement efficiency of >10 ms pores are always higher than <10 ms pores. During the waterflooding development stage of the reservoir, the object of adjusting potential is always >10ms pores portion. When the permeability is more than 0.48 ×10-3μm2, the residual oil is mainly concentrated in > 10ms pores. When the permeability is less than 0.48×10-3μm2 after waterflooding, the residual oil is mainly concentrated in < 10ms pores which indicates the direction for the implementation of EOR technology after the end of reservoir water flooding.
keywords:micromechanism of water drive, interval oil displacement efficiency, contribution of oil displacement efficiency, ultra-low permeability sandstone reservoir, ??Huaqing oil field, Ordos basin
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