摘要
渤海地区稠油资源十分丰富,但由于储层厚度大、非均质性严重,水驱开发效果较差,亟待采取大幅度提高采收率技术措施。针对矿场实际需求,以LD5-2油藏地质特征和流体性质为模拟对象,开展了组合调驱增油降水实验研究和机理分析,并提出了一种可定量研究层内非均质储层吸液剖面变化规律的实验方法,实现从注入端和采出端同时监测剖面变化规律。结果表明,组合调驱可以产生协同效应。在注入段塞尺寸为0.3 PV条件下,与单一三元复合体系调驱相比,组合调驱采收率增幅提高18百分点。“分注分采”岩心实验发现,在发生液流转向作用前提下,高渗透层入口分流率低于出口分流率,低渗透层反之。在调剖调驱过程中合理控制注入压力可避免低渗层受到较严重污染,有利于提高调剖调驱措施效果。
Heavy oil resources are abundant in Bohai region.However,due to the large reservoir thickness and serious heterogeneity,the development effect of water flooding is poor,it is urgent to take technical measures to substantially enhance oil recovery.In view of the actual needs of the field,taking the geological characteristics and fluid properties of LD5-2 reservoir as the simulated object,the experimental research and mechanism analysis of combined profile control and flooding for increasing oil and lowering water were carried out,and an experimental method was proposed to quantitatively study the variation law of the liquid absorption profile of the heterogeneous reservoir in the formation,realizing the simultaneous monitoring of the profile change law from the injection end and the production end.The results indicated that combined profile control and flooding could generate synergistic benefits.Under the condition of injection slug size of 0.3 PV,compared with a single ternary composite system for profile control and flooding,the combined profile control and flooding increased the recovery rate by 18%.Through the core experiment of"separate injection and separate production",it was found that under the premise of liquid flow diversion,the inlet diversion rate of the high permeability layer was lower than the outlet diversion rate,while the low permeability layer presented an opposite trend.Reasonable control of injection pressure during profile control and flooding could avoid severe pollution of low permeability layers,which was beneficial for improving the effectiveness of profile control and flooding measures.
作者
吕金龙
刘长龙
李彦阅
肖丽华
黎慧
王楠
庞长廷
宋鑫
鲍文博
LYU Jinlong;LIU Changlong;LI Yanyue;XIAO Lihua;LI Hui;WANG Nan;PANG Changting;SONG Xin;BAOWenbo(Tianjin Branch of CNOOC Ltd.,Tanggu,Tianjin 300450,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2023年第2期257-263,共7页
Oilfield Chemistry
基金
中海油“十四五”集团公司重大科技项目“海上高含水油田提高注采效率关键采油工艺技术”(项目编号KJGG2021-0502)。
关键词
稠油油藏
乳化降黏
多元组合
物理模拟
机理分析
heavy oil reservoir
emulsification and viscosity reduction
multivariate combination
physical simulation
mechanism analysis
