Practice and understanding of efficient development of Deep CBM in Southern Yanchuan CBM field
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摘要: 以国内首个深部煤层气田—延川南煤层气开发调整实践为例，针对深部煤层气储层非均质性强、开发井网部署模式单一、常规水力压裂适用性较差、传统排采周期过长以及低效井占比大等难题，通过深部煤层气地质-工程一体化技术的深度融合，形成了延川南深部煤层气的高效开发产建模式。结果表明：(1) 延川南深部煤层气田规模化产能建设历经规模建产、技术攻关、创新推广3个开发阶段，形成了“四元耦合”地质-工程双甜点优选和高效开发地质认识，创立了“有效支撑”压裂理念及储层改造关键配套技术、提出了“四段三稳三控”优快上产排采等针对性技术，平均见气周期由240 d缩短至30 d，单井产量实现大幅提升，定向井单井日产气达2.0×104m³，水平井单井日产气达6.5×104m³。(2) 深部煤层气非均质性强、效益开发难度大，产能建设按照“整体部署、分批实施、评建一体、滚动建产”的思路，不断评价调整地质-工程双甜点区，及时优化开发方案，有效规避低效井成批出现，产能到位率由最初84%提升至100%，经济效应明显提高。(3) 立足井位部署-钻完井-储层改造-试气排采-集输处理等气藏全生命周期，遵循地质-工程一体化理念，形成了“储量-井网-缝网”相匹配的合理井距，单井动用储量提高30%-50%；建立了“提速+降本”为核心的优快钻完井技术，钻进速度较早期提速34%；提出了“高低压分输+三级增压+站间互通”为内涵的低压集输工艺技术，平台投资降低10.8%、节约用地20%。延川南煤层气田地质工程一体化实践，为深部煤层气产业发展提供了技术支持，具有较好的示范和带动意义。Abstract: Taking the practice of adjusting the development of Yanchuan South coalbed methane (CBM), the first medium-depth CBM field in China, as an example. Depth CBM is confronted with challenges of high reservoir non-homogeneity, single deployment mode of development well network, poor applicability of early conventional hydraulic fracturing, excessively long traditional drainage and extraction cycle, and large proportion of inefficient wells, etc. The exploration and practice of high-efficiency development and adjustment of Yanchuan South CBM Field provides a successful experience and technical reference for the effective exploitation of deep CBM in China. Practical research shows that: (1) Yanchuan South Deep Coalbed Methane Field has gone through three stages of development, including scale production, technology research, and innovation promotion. By deepening the research on the geological enrichment patterns of CBM, the geological understanding of the “Quadruple Coupling”for geological-engineering double-sweet-spot preferential selection has been formed. The concept of “effective support” was proposed innovatively, and key supporting technologies for reservoir reforming have been developed. The “four sections, three stabilizing and three controlling” technology of optimizing the production and discharge of mining has been established. The new technique shortened the average gas cycle from 240 d to 30 d. And the production of single wells has been greatly increased, with the daily gas production of directional wells reaching 2.0×104m³ and horizontal wells reaching 6.5×104m³. (2) Deep coalbed methane has strong non-homogeneity and difficult to develop effectively. The idea of overall development, batch implementation, integrated evaluation and construction, and rolling production construction is used to build production capacity. The Company constantly evaluates and adjusts the geological and technical double sweet spot areas, optimises the development plan in a timely manner, and effectively avoids the occurrence of low-efficiency wells in the batches. The economic impact of the programme has been significantly improved, with production rates increasing from 84% to 100%. (3) Based on the full life cycle of the gas reservoir, including well positioning, drilling and completion, reservoir stimulation, testing and production, and gathering, processing and treatment, the project adheres to the concept of geological-engineering integration and has formed a rational well spacing that matches the reserves, well networks and fracture networks. The reserve recovery rate of each well was increased by 30-50%. The project has established a fast and cost-effective drilling and completion technology, with the drilling speed increased by 34% compared to the early stage. It has also proposed a low-pressure gathering and processing technology involving "high-low pressure separation + three-stage boosting + inter-station connectivity", resulting in a 10.8% reduction in platform investment and a 20% saving in land use. The geological-engineering integration practice in the Yanchao South coal seam gas field provides technical support for deep coal seam gas development, and has good demonstration and promotion significance.
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Keywords:
- Yanchuan South /
- depth CBM /
- efficient development /
- effective support /
- geo-engineering integration
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