摘要
为了解决CO_(2)分注井节流压差建立困难,气嘴易冲蚀的技术难题,通过构建CO_(2)物性变化的流动-传热耦合模型,揭示2级和3级节流气嘴的流场演化机制,优化设计气嘴结构、建立了绕流气嘴节流图版并开展现场应用。结果表明:流量为10 m3/d时,2级嘴径1.4 mm和3级嘴径1.6 mm的绕流气嘴分别能产生将近6 MPa和8 MPa的节流压差,证明绕流气嘴结构合理、性能可靠、能够达到调整层间压差的技术要求;参照气嘴图版优选的节流气嘴,现场应用20口井,节流压差可达4 MPa左右,调整后注入压力上升2.4 MPa,加强层相对吸气比例由9.7%上升至50.7%,有效调整了层间差异,解决了分注井小层吸气不均的问题。研究结果指导现场测调,为CO_(2)分注规模化应用提供技术支撑。
In order to resolve technical challenges of establishing throttling pressure difference and easy erosion of gas nozzles in CO_(2) separated-layer injection wells,flow-heat transfer model of CO_(2) property changes is established to illustrate flow field evolution mechanism of 2nd stage and 3rd stage throttling gas nozzles,optimize gas nozzle struc⁃ture design,establish throttling charts for bypass-flow gas nozzle and perform field application.The results show that,with flow rate of 10 m3/d,2nd-stage bypass-flow gas nozzle with diameter of 1.4 mm and 3rd-stage bypass-flow gas nozzle with diameter of 1.6 mm generate throttling pressure differences of nearly 6 MPa and 8 MPa,respective⁃ly,proving the rational structure and reliable performance of throttling gas nozzles,which meet technical require⁃ments for adjusting interlayer pressure difference;Throttling gas nozzles are optimized by gas nozzle charts,and ap⁃plied in 19 field wells,with throttling pressure difference reaching about 4 MPa.After adjustment,injection pres⁃sure is increased by 2.4 MPa,and relative gas adsorption ratio of intensified layer is increased from 9.7%to 50.7%,effectively adjusting interlayer differences and solving the problem of uneven gas adsorption in layers of separatedlayer injection wells.The research guides on-site measurement and adjustment,and provides technical support for large-scale application of CO_(2) separated-layer injection.
作者
蔡萌
朱振坤
刘云
刘钰川
李海成
CAI Meng;ZHU Zhenkun;LIU Yun;LIU Yuchuan;LI Haicheng(Production Technology Institute of PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163453,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Reservoir Stimulation,Daqing 163453,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2024年第1期119-127,共9页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油天然气股份有限公司CCUS重大专项“松辽盆地(大庆、吉林)CCUS技术集成与工业化试验”(110021329008)。
关键词
CO_(2)分注
绕流气嘴
节流机理
气嘴图版
节流压差
CO_(2) separated-layer injection
bypass-flow gas nozzle
throttling mechanism
gas nozzle chart
throt⁃tling pressure difference
