羌塘盆地油气地质调查井地层条件与施工难点

Stratigraphic conditions and construction difficulties of oil and gas geological survey wells in Qiangtang Basin

摘要:

羌塘盆地油气资源勘查工作力度不大，存在大量空白区域有待进一步探索。地质调查井是羌塘盆地油气资源调查研究的重要工程手段，主要采用绳索取心钻进工艺获取全孔段高质量原位岩心与测井通道，并在十余年间逐渐替代提钻取心钻进工艺。羌塘盆地地理位置与气候条件特殊，地层条件复杂，绳索取心钻进工艺在该区域应用遇到了许多施工难点。笔者结合岩性测试数据和地层应力条件，分析阐明绳索取心钻进工艺与油气全面钻井工艺在井身结构、钻进参数、钻井液、堵漏堵涌等方面存在显著差异，相关参数指标与实践经验无法简单照搬。同时，整理羌塘盆地多年地质调查井典型问题，围绕绳索取心钻进工艺井壁稳定、钻井液、钻井漏涌、工程实施等方面进行详细阐述分析，可为今后该区域地质调查井设计与施工提供重要参考。

Abstract:

The exploration of oil and gas resources in the Qiangtang Basin is not strong, and there are a large number of blank areas that need further exploration. Geological survey wells are an important engineering tool for the investigation and research of oil and gas resources in the Qiangtang Basin. They mainly use wireline coring drilling technology to obtain high-quality in-situ rock cores and logging channels for the entire borehole section, and have gradually replaced the core drilling technology over the past decade. The Qiangtang Basin has a unique geographical location and climatic conditions, with complex geological conditions. The application of wireline coring drilling technology in this area has encountered many construction difficulties. The author combines lithological testing data and geological stress conditions to analyze and clarify that there are significant differences between the wireline coring drilling process and the full-face oil and gas drilling process in terms of wellbore structure, drilling parameters, drilling fluid, and plugging and surging. Relevant parameter indicators and practical experience cannot be simply copied. At the same time, typical problems of geological survey wells in the Qiangtang Basin over the years were sorted out and analyzed in detail, focusing on aspects such as wellbore stability, drilling fluid, drilling leakage, and engineering implementation, which can provide important references for the design and drilling operation of geological survey wells in the region in the future.