石油勘探与开发2018，Vol.45Issue(2)：287-296,10.DOI:10.11698/PED.2018.02.11
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
摘要
Abstract
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Key words
deepwater field development/volatile oil reservoir/water-cut rising type/reservoir connection relationship/water-cut rising mechanism/optimized water injection分类
能源科技引用本文复制引用
苑志旺,杨宝泉,杨莉,顾文欢,陈筱,康博韬,李晨曦,张会来..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[J].石油勘探与开发,2018,45(2):287-296,10.基金项目
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) （2011ZX05030-005）
