海上油田同心精细分层注气工艺研究及应用
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关键词：海上油田；分层注气；同心测调；注气工作筒；流量测试；插入密封中图分类号：TE934文献标识码：A DOI：10.12473/CPM.202502015
Research and Application of Concentric Fine Separate-layer Gas Injection Process in Offshore Oilfields
Xue Dedong1，2Kou Lei²Zheng Chunfeng1，2，3RenWeina²Xiao Zuyin² （1.KeyLaboratoryforEnhancedOilRecovery，CNOOCEnergyTechnology&ServicesLimited;2.CNOOCEnerTech-Driling& ProductionCo.；3.State KeyLaboratory ofOffshoreOil andGas Exploitation）
Abstract：Gas injectionisacriticaltechnique to replenish formation pressure for enhancing oil recovery in low-permeabilityoilfields.At present，the single-string separate-layer gas injection with throwing and fishing gas nozzles isadopted intheBohai Oilfield，butitcannotread downholedatainareal-timemanner whileregulation andthus fails to accurately adjust the injection volume.This paper presents the concentric fine separate-layer gas injection processforofshore oilfieldsand develops associated tolsand techniques.Among these tools，the gas injection measurement and adjustment working cylinder with maximum temperature and presure resistance up to 150∘C and 60MPa ，respectively，can realize a steplessregulation of gas injection rate，and the gas flow tester relying on flow-concentrating test process canachieve testof individual intervalsandalso two-way communication with downhole equipment.Field applications have demonstrated successful measurementandadjustmentof the concentricfine separate-layer gas injection process.The proposed process was verified to beapplicable to welbores with diameter of 98.55 mm and inclination not greater than 60∘ ，and could effectively address the issues of gas sealing， gas corrosion，gas erosion，and gas injection safety.Moreover，it yieldeda qualified injectionrate reaching 95% （20 and reduced the overall injection adjustment duration from 48h to 12h .This study provides a new technical option for efficient gas flooding in offshore low-permeability oilfields.
Keywords：ofshore oilfield；separate-layer gas injection；concentric measurement and adjustment；gas injection working cylinder；flow test；insert seal
0 引言
目前，以渤海油田为代表的海上油田主要采用注水开发方式，注水开发在低渗和水敏油藏开发中受到较大限制。（剩余10779字）