中国煤层气勘探开发及其科技进步历程回顾与思考

China's CBM exploration and production and associated technological advancements:A review and reflections

  • 摘要: 【目的和方法】 整理研究大量科技文献和煤层气勘探开发项目技术资料,对比分析煤层气关键技术发展脉络和最新进展,回顾了三十多年来我国煤层气勘探开发历程,讨论了煤层气勘探开发面临的理论和技术挑战,提出了未来煤层气发展方向。【进展】 结果显示,深层(深部)煤层气吸附态、游离态转换变化是一个重大理论认识,勘探开发思想认识的突破和近钻头地质导向技术、水平井多级分段体积压裂技术的创新应用,成就了我国深层煤层气开发的新局面,深层煤层气成藏机理及成藏模式、勘探开发评价方法及其煤层气生产规律的认识是近年来的重要进展,地质–工程一体化是开展有利区预测评价、井位部署、适配性技术研发等的有效方法。丛式水平井井组部署及其与直井/定向井组相结合的部署、水平井多级分段体积压裂改造、无杆举升智能化排采,构成了当前最为先进的煤层气开采综合技术体系。薄煤层煤层气实现高效开采,突破了煤层气开发厚度下限,开辟了新层系。研究认为,我国煤层气开发存在两大对象,即以吸附气为主的煤层气藏和吸附气+游离气共存的煤层气藏,两者在成藏机理、勘探开发技术、勘探开发思想上存在明显差异。【展望】 未来我国煤层气勘探开发应该面向四个领域展开:深层煤层气将成为未来煤层气勘探开发主要领域和技术攻关的主要方向,要加大加快鄂尔多斯盆地深部、准噶尔盆地、吐哈盆地、塔里木盆地和四川盆地等地台型沉积盆地深层煤层气资源勘探和开发;中深层煤层气是规模化开发的重要方向;浅层煤层气是煤层气产业发展的压舱石,需要继续做好稳产、接替工作;低阶煤储层煤层气是一个潜在领域。

     

    Abstract: Objective and Methods Based on extensive scientific and technical literature and technical data on coalbed methane (CBM) exploration and production projects, this study conducted a comparative analysis of the development process and latest advances in China's critical technologies for CBM exploration and production and reviewed the CBM exploration and production history of this country over the past three decades. Accordingly, this study discussed the theoretical and technical challenges in CBM exploration and production and proposed future development directions. Advances in Research The results indicate that the insights into conversion between adsorbed and free deep CBM prove to be a significant theoretical understanding. The breakthroughs in the ideological understanding of exploration and production, as well as the innovative applications of near-bit geosteering drilling technology and multistage volume fracturing technology for horizontal wells, elevate China's deep CBM production to a higher level. Recent years have seen major advances in the accumulation mechanisms and modes of deep CBM, assessment methods for CBM exploration and production, and knowledge about CBM production regularity. The geology-engineering integration serves as an effective method for the prediction and assessment of play fairways, well deployment, and the research and development of adaptive technologies. Presently, the most advanced comprehensive technology system for CBM production consists of the deployment of cluster horizontal well groups, the deployment of horizontal well groups combined with vertical and directional well groups, the multistage volume fracturing of horizontal wells, and the intelligent dewatering and CBM production using rodless lifting. Furthermore, the efficient CBM production of thin coal seams suggests a breakthrough in the lower limit of coal seam thickness for CBM production and the discovery of new target layers for CBM production. China's CBM production focuses primarily on CBM reservoirs dominated by adsorbed gas and those bearing both adsorbed and free gas. The two major CBM reservoir types differ significantly in gas accumulation mechanisms and the technologies and philosophies for CBM exploration and production. Prospects It is recommended that the future CBM exploration and production in China should center on four fields. Specifically, deep CBM will be the primary target for future CBM exploration and production and technological research, and it is necessary to intensify and accelerate the exploration and production of deep CBM resources in platform-type sedimentary basins such as the Ordos, Junggar, Turpan-Hami, Tarim, and Sichuan basins. Large-scale production of moderately deep CBM is identified as an important direction. Shallow CBM, acting as the “ballast stone” for the development of the CBM industry, is supposed to keep continued stable production and serve as the replacement for current CBM resources. Additionally, CBM in low-rank coal reservoirs is a potential target for CBM exploration and production.

     

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