蔡萌,朱振坤,刘云,刘钰川,李海成
CAI Meng,ZHU Zhenkun,LIU Yun,LIU Yuchuan,LI Haicheng

• 1:中国石油大庆油田有限责任公司采油工程研究院
• 2:黑龙江省油气藏增产增注重点实验室

摘要(Abstract)：

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 m~3/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 structure design, establish throttling charts for bypass-flow gas nozzle and perform field application. The results show that, with flow rate of 10 m~3/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, respectively, proving the rational structure and reliable performance of throttling gas nozzles, which meet technical requirements for adjusting interlayer pressure difference; Throttling gas nozzles are optimized by gas nozzle charts, and applied in 19 field wells, with throttling pressure difference reaching about 4 MPa. After adjustment, injection pressure 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.

关键词(KeyWords)： 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;throttling pressure difference

Abstract:

Keywords:

基金项目(Foundation): 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）

作者(Author): 蔡萌,朱振坤,刘云,刘钰川,李海成
CAI Meng,ZHU Zhenkun,LIU Yun,LIU Yuchuan,LI Haicheng

DOI: 10.19597/J.ISSN.1000-3754.202306036

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