枯竭砂岩气藏型储气库录井关键技术研究以文23储气库为例

Key Mud Logging Technologies for Depleted Sandstone Gas Storage ——Case Study of the Wen 23 Gas Storage

王志战

WANG Zhizhan

页岩油气富集机理与有效开发国家重点实验室，北京 100101 中国石化石油工程技术研究院，北京 100101

State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100101, China Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China

井筒封闭性对储气库的建设至关重要。枯竭砂岩气藏型储气库断层发育，在其建设过程中，存在井漏频发、盐膏层段固井质量难以保证等工程技术难题，对井筒完整封闭性构成潜在风险。为此，以文23储气库为例，研究了枯竭砂岩气藏型储气库录井关键技术。利用文23储气库注采气井的钻井录井资料，并结合前期勘探开发资料，从盖层封闭性、断层封闭性2个角度评价了井筒封闭性，建立了该储气库沙三段盐膏层断缺条件下的盖层识别与评价方法，形成了基于钻井液出口流量曲线变化形态的井漏原因判别模式和断层封闭性评价方法；为了提高井筒封闭的完整性，建立了该储气库沙三段盐膏层发育和断缺2种条件下钻穿盖层底界5.00～10.00 m卡准中完井深的方法。应用实例表明，以上述方法为核心形成的枯竭砂岩气藏型储气库录井关键技术，从地质和工程2方面解决了储气库井筒封闭性录井评价难题，有助于提高录井对储气库建设的技术支持力度与技术服务质量。

The integrity of the wellbore is crucial to the construction of gas storage. Depleted sandstone gas storage experienced issues with faults and experienced several engineering problems such as the frequent occurrence of leakage and poor cementing quality in a salt-gypsum interval during drilling operations, which posed potential risks to the wellbore integrity. For this reason, the Wen 23 Gas Storage was studies as an example, and the key technologies in the mud logging of those gas storages were studied. By using the drilling/mud logging data of gas injection/production wells in the Wen 23 Gas Storage, combined with the preliminary exploration and development data, the wellbore integrity was evaluated from two aspects of caprock sealing and fault sealing. Thus caprock identification and evaluation methods were established on the bases of faulting and the absence of the salt-gypsum interval in Es3 Member of this formation used for gas storage. With that, the discrimination modes for the reasons of lost circulation and the fault sealing evaluation methods were established on the basis of drilling fluid outlet flow curve variations and pattern. In order to improve the wellbore integrity, the methods for calibrating the intermediate completion depth while penetrating 5.00–10.00 m into the caprock bottom boundary were established on the premise of the salt-gypsum interval occurrence and missing in Es3 Member of this gas storage formation. The practical applications showed that the key mud logging technologies based on the above methods could solve the problem of closed mud logging/evaluation for the wellbore sealing of gas storage from the perspective of geology and engineering, which helped to improve the strength and quality of mud logging support and service to gas storage construction.

中国石化科技攻关项目“中原文23储气库钻完井关键技术”（编号：P18098-1）、中石化中原储气库有限责任公司项目“文23储气库项目（一期工程）测录井技术支持服务”（编号：10010099-18-FW0413-0001）资助

https://doi.org/10.11911/syztjs.2019059