Core Viewpoint - Chinese geological researchers have achieved a breakthrough in unconventional oil and gas industrial gas flow in the western Hubei region, expanding shale gas exploration from the Sichuan Basin to the western Hubei area, with an additional geological resource of 1329.5 billion cubic meters of shale gas [1] Group 1 - The successful testing of the horizontal well in the Enshi region (Er'en Ye 2HF well) yielded a daily gas production of 50,600 cubic meters, expanding the investigation of the Dalong formation [1] - The vertical well in the Hefeng region (Er'he Ye 3 well) achieved a daily gas production of 10,700 cubic meters in the Qixia formation [1] - The research has enriched the understanding of unconventional gas accumulation theories in complex structural areas, establishing a new accumulation model for mudstone gas [1] Group 2 - An innovative technology for the efficient return of fracturing fluid in low-pressure shale gas has been developed, combining electric submersible pumps, gas lift, foam drainage, and intelligent monitoring [1] - The successful implementation of this technology in the Er'en Ye 2HF well provides critical technical support for the economic and effective development of low-pressure shale gas [1] - The theoretical insights and efficient return technology developed will significantly guide shale gas exploration in complex structural areas, holding substantial theoretical and practical significance [1]

近日，大庆钻探在鄂尔多斯盆地郝20井保压取心作业中取得成功，一举创下中石油煤层气公司韩城区块 单井累计取心进尺最多、岩心收获率最高、取心筒数最多、取心层位最全4项纪录，破解了该区域煤岩 层取心难题，为非常规油气勘探提供了新利器。 研发工具破难题 郝20井是中石油煤层气公司在鄂尔多斯盆地伊陕斜坡东部部署的一口直井评价井，设计井深2506米，保 压取心进尺95.77米，担负着评价5#煤层和8#煤层储层及含气情况的重要使命。 该井需要获取深层煤层各项储层参数，兼探大宁—吉县区块山西组和本溪组页岩储层及含气情况，同时 需要探索太原组灰岩、马家沟组碳酸盐岩储层及含气性。然而，韩城区块煤层气储层具有煤层气层系复 杂、气体易逸散的复杂特征，常规取心技术难以保留地层原始状态。取出来的岩心如果不"原汁原味"， 将直接影响储层评价和含气量测试的准确性，进而影响整个区域的勘探决策。 针对郝20井复杂地质条件，大庆钻探工程技术研究院工程技术转化推广分公司取心团队对自主研发的 DQBYM194-80型保压取心工具进行了针对性升级。他们完善了工具自锁式球阀密封结构，解决了高压 地层密封难题。 "随着我国非常规油气勘探向深层、复杂储层延伸 ...

Core Insights - China National Petroleum Corporation's Daqing Drilling achieved a significant technological breakthrough in coalbed methane exploration in the Ordos Basin, utilizing a self-developed pressure-maintaining coring tool to address coring challenges [1][2] - The Daqing Drilling team set four records in the Han Cheng block, including the highest cumulative coring depth per well, the highest core recovery rate at 98.38%, the most comprehensive coring layers, and the fastest mechanical drilling speed [1] - The successful implementation of a customized tool, refined processes, and comprehensive monitoring during the coring operation has provided critical geological data and technical support for coalbed methane exploration in the Ordos Basin [2] Group 1 - Daqing Drilling's new coring technology allows for the preservation of the original state of the reservoir, which is crucial for accurate evaluation of gas content and reservoir parameters [1][2] - The Daqing Drilling team formed a collaborative task force to address the complex geological conditions of the Hao 20 well, leading to targeted upgrades of the pressure-maintaining coring tool [1] - The core recovery rate exceeded design expectations by 18.38%, indicating the tool's effectiveness in high-pressure formations [1] Group 2 - The operational model developed by Daqing Drilling includes customized tools, refined processes, and full monitoring, achieving the technical goal of maintaining pressure during coring [2] - The drilling team optimized the well trajectory and adjusted drilling parameters to create a stable downhole environment for coring operations [2] - This technological advancement not only aids in precise resource evaluation but also enhances the optimization of development plans for coalbed methane [2]