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1.中石油煤层气有限责任公司工程技术研究院
2.中联煤层气国家工程研究中心有限责任公司
3.中石油煤层气 有限责任公司临汾采气管理区
4.大港油田石油工程研究院钻采技术开发有限公司
Received:20 August 2024,
Revised:2025-02-26,
Published:10 October 2025
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吴建军,王玉斌,马文涛,等.深层煤岩气双管射流泵全流程带压排采管柱研制与应用[J].石油机械,2025,53(10):132-138.
Wu Jianjun,Wang Yubin,Ma Wentao,et al.Development and application of dual⁃tubing jet pump full⁃process pressure⁃maintained drainage string in deep coal⁃rock gas wells[J].China Petroleum Machinery,2025,53(10):132-138.
吴建军,王玉斌,马文涛,等.深层煤岩气双管射流泵全流程带压排采管柱研制与应用[J].石油机械,2025,53(10):132-138. DOI: 10.12473/CPM.202408088.
Wu Jianjun,Wang Yubin,Ma Wentao,et al.Development and application of dual⁃tubing jet pump full⁃process pressure⁃maintained drainage string in deep coal⁃rock gas wells[J].China Petroleum Machinery,2025,53(10):132-138. DOI: 10.12473/CPM.202408088.
深层煤岩气对井筒内压力敏感,实施压井作业会对煤岩产气造成影响。为此,提出了深层煤岩气双管射流泵全流程带压作业工艺方法,并配套研制了全流程带压作业管柱及关键工具,分析了全流程带压作业管柱结构和各个流程的工作原理。双管射流泵管柱采用液力打捞器带压投捞底阀作业,确保射流泵在起泵芯、试压等作业中不影响液力开关阀的开关状态,能够实现下管柱、试压、自喷、排采起下泵芯及起管柱全流程带压切换。开展了液力开关阀升级改进和室内试验研究,使液力开关阀具备底部进液可悬挂气锚和参数现场可调节的功能。该工艺在吉县大宁区块X1井进行了现场应用。现场应用结果表明,该工艺管柱满足深层煤岩气井35 MPa下全流程带压作业,液力开关阀可根据管柱不同流程开启或关闭。所得结论对深层煤岩气的高效排采具有指导意义。
Deep coal-rock gas reservoir is sensitive to downhole pressure variation, and implementing kill operation may cause damage to gas production. Consequently, a full-process pressure-maintained operation technique of dual-tubing jet pump for deep coal-rock gas reservoirs was proposed. Meanwhile, supporting full-process pressure-maintained operation string and key tools were developed. Furthermore, the full-process pressure-maintained operation string structure and the operating principle of each process were analyzed. The dual-tubing jet pump string utilizes a hydraulic fisher to perform pressurized bottom valve deployment/retrieval. This ensures the jet pump operations (including pump core retrieval, pressure test, etc.) do not affect the switching state of the hydraulic flow switch, and can realize the full-process pressurized switching from running string, pressure test, flowing, pump core running/retrieval for deliquification to string retrieval. Moreover, upgrade improvements and experimental study were conducted on the hydraulic switch, enabling it to feature a bottom inlet for gas anchor suspension and field parameter adjustment. Finally, this technology was applied at Well X1 in the Daning-Jixian Block. The field application results show that the process string meets the requirements for full-process pressure-maintained operation below 35 MPa in deep coal-rock gas wells, and the hydraulic switch can be triggered to open/close according to different processes. The study conclusions have guiding significance for the efficient deliquification of deep coal-rock gas wells.
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