深水浊积砂岩油田含水上升机理及优化注水技术——以西非尼日尔三角洲盆地AKPO油田为例  

Water-cut rising mechanism and optimized water injection technology for deepwater turbidite sandstone oilfield: A case study of AKPO Oilfield in Niger Delta Basin, West Africa

作　　者：苑志旺 杨宝泉 杨莉 顾文欢 陈筱 康博韬 李晨曦 张会来 YUAN Zhiwang;YANG Baoquan;YANG Li;GU Wenhuan;CHEN Xiao;KANG Botao;LI Chenxi;ZHANG Huilai(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028

出　　处：《石油勘探与开发》2018年第2期287-296,共10页Petroleum Exploration and Development

基　　金：国家科技重大专项"西非;亚太及南美典型油气田开发关键技术研究"(2011ZX05030-005)

摘　　要：通过对AKPO高挥发性油田储集层连通关系与油井见水后含水上升规律的分析,建立新型含水上升模型,确定优化注水时机和策略。可将含水上升形态划分为3种类型,其油井含水上升机理主要受储集层连通关系控制,单期水道或朵叶体内单期砂体直接连通,储集层发育及层内连通性好,直接注采受效,含水上升曲线呈"亚凸型";多期砂体搭接连通,层内连通性好,但搭接部位储集层物性、连通性较差,注水受效较慢,含水上升曲线呈"亚凹形";多期砂体复合连通,具有直接连通与搭接连通两种类型的特点,储集层物性与连通性介于两者之间,注水受效稍慢,含水上升曲线呈"亚S型"。以油水相对渗透率比值关系式为基础,建立了新型含水上升规律模型;通过对实际油井生产数据的拟合分析,提出了油井见水后实施优化注水的最佳时机与相应技术,水道储集层可采用"提高纵向波及"为核心、朵叶体储集层可采用"改善平面波及"为核心的优化注水技术;经AKPO油田实际应用,效果显著,可以指导同类油田的开发。Through the analysis of the reservoir connection relationship and the water-cut rising rules after water breakthrough in the highly volatile oil AKPO oilfield,a new model of water-cut rising was established,and the timing and strategy of water injection were put forward.The water-cut rising shapes of producers after water breakthrough can be divided into three types,and their water-cut rising mechanism is mainly controlled by reservoir connectivity.For the producers which directly connect with injectors in the single-phase sand body of the single-phase channel or lobe with good reservoir connectivity,the water-cut rising curve is'sub-convex'.For the producers which connect with injectors through sand bodies developed in multi-phases with good inner sand connectivity but poorer physical property and connectivity at the overlapping parts of sands,the response to water injection is slow and the water-cut rising curve is'sub-concave'.For the producers which connect with injectors through multi-phase sand bodies with reservoir physical properties,connectivity in between the former two and characteristics of both direct connection and overlapping connection,the response to water injection is slightly slower and the water-cut rising curve is'sub-S'.Based on ratio relationship of oil and water relative permeability,a new model of water cut rising was established.Through the fitting analysis of actual production data,the optimal timing and corresponding technology for water injection after water breakthrough were put forward.Composite channel and lobe reservoirs can adopt water injection strategies concentrating on improving the vertical sweep efficiency and areal sweep efficiency respectively.This technology has worked well in the AKPO oilfield and can guide the development of similar oilfields.

关 键 词：深水油田开发 挥发性油藏 含水上升类型 储集层连通关系 含水上升机理 优化注水 

分 类 号：TE341[石油与天然气工程—油气田开发工程]