摘要
赵凹油田安棚地区浅中层系为多物源扇三角洲沉积体系,油层埋藏较深,属于典型的裂缝性特低渗油气藏。早期采用不规则反九点注采井网进行开发,大部分生产井表现出北东向暴性水淹,后注采井排由东西向调整为北东向,采用不规则五点法开发,但受储层物性差、天然裂缝发育、非均质性强等因素影响,开发效果仍未得到明显改善,扇三角洲前缘及构造轴部水窜高发、近物源区注水不见效。基于差异化储层认识,针对性采用小井距加密、压驱增注、周期注水等矢量化井网调整及配套压裂、增注工艺技术。现场应用后,2020—2024年累计实施新井及措施井47口,区块采油速度由0.13%最高提升至0.30%,阶段累计增油2.3×10^(4) t,有效改善了开发效果。研究可为同类裂缝性特低渗油藏高效开发提供技术参考。
The shallow-middle layers in the Anpeng area of Zhaowa Oilfield belong to a multi-provenance fan delta sedimentary system.With deep-buried oil reservoirs,they are typical fractured ultra-low permeability oil and gas reservoirs.In the early stage,an irregular inverted nine-spot injection-production well pattern was adopted for development,and most production wells showed violent water flooding in the northeast direction.Later,the injection-production well rows were adjusted from east-west to northeast,and an irregular five-spot well pattern was used.However,affected by factors such as poor reservoir physical properties,well-developed natural fractures,and strong heterogeneity,the development effect has not been improved.High incidence of water channeling occurs in the fan delta front and structural axis,while water injection is ineffective in the near-provenance area.Based on the differentiated understanding of reservoirs,vectorized well pattern adjustment technologies such as small well spacing infill drilling,fracturing-driven injection enhancement,and cyclic water injection,as well as supporting fracturing and injection enhancement technologies,were adopted in a targeted manner.After field application,a total of 47 new wells and stimulation wells were implemented from 2020 to 2024.The oil production rate of the block increased from 0.13%to a maximum of 0.30%,and the cumulative oil increase in the stage reached 2.3×10^(4) t,improving the development effect.This study provides a technical reference for the efficient development of similar fractured ultra-low permeability oil reservoirs.
作者
刘峥君
周永强
贺子潇
黎明
苏剑红
陈昭
韩丰华
LIU Zhengjun;ZHOU Yongqiang;HE Zixiao;LI Ming;SU Jianhong;CHEN Zhao;HAN Fenghua(Exploration&Development Research Institute of Henan Oilfield Company,SINOPEC,Nanyang,Henan 473132,China)
出处
《石油地质与工程》
2025年第6期1-5,11,共6页
Petroleum Geology and Engineering
关键词
赵凹油田安棚地区
特低渗油藏
储层认识
技术对策
开发效果
Anpeng area of Zhaowa Oilfield
ultra-low permeability reservoirs
reservoir understanding
technical countermeasures
development effect
