四川盆地页岩气地质工程一体化 高效开发关键技术与装备. (Chinese)

Key techniques and equipment for efficient integrated geoscience‑engineering development of shale gas in Sichuan Basin. (English)

The complex characteristics of shale gas in Sichuan Basin including complex reservoir structure, deep burial, thin sweet spot reservoirs, much-developed fractures/faults, large in-situ stress difference, high fracturing pressure and rapid production decline are rare in the world. This makes existing North American shale gas development techniques difficult to meet the special requirements of Sichuan Basin, and independent research is urgently needed for efficient shale gas development techniques suitable for complex geological conditions of Sichuan Basin. Aiming at challenges of key techniques and equipment for scientific evaluation of geological sweet spots and engineering sweet spots in shale gas reservoirs, efficient drilling of long horizontal section wells, staged volume fracturing and pressure-controlled efficient development in complex geological conditions in Sichuan Basin, based on research idea of integrated geoscience-engineering and taking geological modeling as foundation, new methods are invented for evaluating“ geology-engineering” dual sweet spots in complex shale gas reservoirs, efficient pressurizing and accelerating and dynamic multi-factors individualized bit design for hard-to-drill strata and parameter optimization for integrated geoscience-engineering staged volume fracturing based on dual sweet spots. High-performance key tools and equipment are independently developed including a series of individualized efficient composite bits, radio-controlled toe fracturing sliding sleeves, fully-soldering bridge plugs and specialized compressors, forming key techniques and supporting equipment with independent intellectual property rights for efficient integrated geoscience-engineering development of shale gas in Sichuan Basin. The research achievements has been applied to 834 well times in large scale in Changning, Weiyuan and Fuling shale gas fields in Sichuan Basin and support the progress of key techniques and equipment for efficient development of shale gas in China by extending bit life, reducing drilling cycles, improving fracturing efficiency and increasing single-well testing production. [ABSTRACT FROM AUTHOR]

四川盆地页岩气具有储层构造复杂、埋藏深、甜点储层薄、裂缝/断层发育、地应力差大、破裂压力高、产量衰减快 等世界罕见的复杂特征，致使原有北美页岩气开发技术难以满足四川盆地的特殊需求，亟需自主研发适应于四川盆地复杂 地质条件的页岩气高效开发技术。针对四川盆地复杂地质条件下的页岩气储层地质甜点与工程甜点科学评价、长水平井高 效钻井、分段体积压裂和控压高效开发的关键技术与装备等难题，基于地质工程一体化研究思路，以地质建模为基础，发 明了复杂页岩气储层“地质-工程”双甜点评价新方法、复杂难钻地层高效增压提速与动态多因素个性化钻头设计方法、基 于双甜点的地质工程一体化分段体积压裂参数优化方法；自主研发了系列个性化高效复合钻头、无线电控趾端压裂滑套、 全溶桥塞和专用压缩机等高性能关键工具与装备，形成了具有中国自主知识产权的四川盆地页岩气地质工程一体化高效开 发关键技术与配套装备。研究成果先后在四川盆地长宁、威远、涪陵等页岩气田大规模应用834井次，通过提高钻头使用 寿命、缩减钻井周期、提升压裂效率及单井测试产量，支撑了中国页岩气高效开发关键技术与装备进步。 [ABSTRACT FROM AUTHOR]

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