川南威荣气田深层页岩气工程技术进展

川南威荣气田是国内首个深层页岩气田，具有“一深、一薄、四高”的特点，钻完井、压裂及排采系列工程技术面临钻井周期长、改造体积小、复杂程度低、井筒流动规律复杂等挑战。针对复杂的地质挑战，不断深化地质认识，深度融合气藏地质与工程技术，围绕降本增效，以突破深层页岩气效益关为目标，持续攻关钻采工程工艺。历经三轮探索优化，钻井技术强化提高机械钻速，减少井下复杂情况风险，缩短钻井周期；压裂工艺优化裂缝配置提升复杂裂缝广度，转换思路大排量扩缝高携砂一体化实现了缝控体积的增加和支撑；排采工艺基于气液两相流研究识别井筒流态，形成全生命周期排采工艺决策方法。最终形成了以“精细轨迹控制优快钻井”、“裂缝均衡扩展强支撑压裂”、“全周期有效排采”为核心的工程技术序列，持续推进效益开发进程。所提出的深层页岩气开发工程技术在威荣气田累计新建产能25亿方，为国内外深层页岩气工程技术发展积累了宝贵经验，也为下一步超深层页岩气开发提供了探索方向。

Progress in deep shale gas engineering technology in Weirong gas field in southern Sichuan

Weirong gas field is the first deep shale gas field in China, with the characteristics of "deep burial depth, thin high-quality reservoirs, high ground stress, high horizontal stress difference, high plasticity and high formation pressure". The engineering technologies of drilling, completion, fracturing, and drainage face challenges such as long drilling cycles, small renovation volumes, low complexity, and complex wellbore flow laws. In response to complex geological challenges, we continuously enhance geological understanding, deeply integrate gas reservoir geology and engineering technology, and continue to research the drilling and production engineering technology with the goal of reducing costs and increasing efficiency and breaking through the benefits of deep shale gas. After three rounds of exploration and optimization of drilling technology, we strengthen and improve mechanical drilling speed, reduce downhole complexity, and shorten drilling cycles. The optimization of fracture configuration in fracturing technology has increased the breadth of complex fractures, and the integration of large displacement expansion and high sand carrying has achieved the increase and support of fracture control volume. The drainage process is based on gas-liquid two-phase flow research to identify wellbore flow patterns, forming a decision-making method for the entire lifecycle drainage process. Finally, an engineering technology sequence focusing on "fine trajectory control for optimal and fast drilling", "balanced expansion of fractures for strong support fracturing", and "full cycle effective drainage" was formed, continuously promoting the process of benefit deve-lopment. With the deep shale gas development engineering technology proposed herein, an accumulated new production capacity of 2.5 billion cubic meters in Weirong gas field has been completed, providing valuable experience for deep shale gas engineering technology at home and abroad, as well as a direction for further exploration and research in ultra-deep shale gas development.