海上低渗薄互层反向压驱压裂工艺技术研究及应用  

Research and application of reverse injection fracturing technology for offshore low-permeability thin interbedded reservoirs

作　　者：段宝江 王一超 钱继贺 蔡振华 李奇 宣涛 DUAN Baojiang;WANG Yichao;QIAN Jihe;CAI Zhenhua;LI Qi;XUAN Tao(Ener Tech-Drilling&Production Co.,CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《复杂油气藏》2024年第3期362-366,共5页Complex Hydrocarbon Reservoirs

基　　金：中海油能源发展重大专项(HFKJ-ZX-GJ-2023-02)。

摘　　要：南海西部某低渗砂泥薄互层油藏非均质性强、产量递减快、油气井斜度大,射孔跨度大、部分井水驱开发效果差。在详细研究油藏特征、开发现状的基础上,通过调研陆上以胜利油田为代表的注水井端正向压驱和以大庆、长庆油田为代表的采油井端反向压驱的应用条件和应用效果,形成针对海上低渗薄互层反向压驱压裂技术措施:利用悬挂分段工具、球剂复合暂堵技术分层;大规模反向压驱对地层补能,采用高效驱油剂进行渗吸置换驱油;逆序混合压裂降低裂缝起裂压力;优选低伤害海水基压裂液满足携砂流变能力,降低储层伤害;大规模加砂压裂有效改造储层。通过现场应用证明,该技术可靠性强,措施后见油快,稳产期长且增产效果显著,较好地解决了海上大跨度多段连续射孔斜井的增产改造难题,对类似油气井的增产改造方案设计提供一定的借鉴。A low-permeability sandstone and mudstone thin interbedded reservoir in the western South China Sea exhibits strong heterogeneity,rapid production decline,high wellbore deviation,large perforation span,and poor waterflooding performance in some wells.Based on a detailed study of reservoir characteristics and current development status,through investigating the application conditions and effects of forward injection at the water well side in the Shengli Oilfield and reverse injection at the production well side in Daqing and Changqing Oilfields,we have formed the targeted reverse injection fracturing technology for offshore low-permeability thin interbedded reservoirs.This technology employs staged segmentation tools and composite temporary plugging techniques with ball sealers,large-scale reverse injection to enhance reservoir energy,efficient oil displacement agents for imbibition and displacement,reverse sequence mixing fracturing to reduce fracture initiation pressure,and optimized low-damage seawater-based fracturing fluid to ensure sand-carrying rheology and minimize reservoir damage.Large-scale sand fracturing effectively modifies the reservoir.Field applications have demonstrated the high reliability of this technology,with rapid oil production,extended stable production periods,and significant production increases.This effectively addresses the challenges of enhancing production in offshore deviated wells with largespan multi-stage continuous perforations,providing valuable insights for designing production enhancement schemes for similar oil and gas wells.

关 键 词：低渗薄互层 大跨度射孔 反向压驱压裂 补能 渗吸置换 

分 类 号：TE348[石油与天然气工程—油气田开发工程]