3月5日记者获悉，我国最大的煤岩气田——煤层气公司大吉气田，日产气量突破1100万立方米，创历史新高。在“十五五”开局的关键节点，气田依托“新型全生命周期五步控压排采”理念及配套技术体系，实现煤岩气产量同比增长32%，上产势头强劲，标志着深层非常规天然气开发实现跨越式发展。

On March 5th, reporters learned that the largest coalbed methane field in China - the Dagiji gas field of the Coalbed Methane Company - has achieved a daily gas production of over 11 million cubic meters, setting a new record high. At the crucial starting point of the "15-16" period, the gas field, relying on the "new type of full life cycle five-step pressure control and production" concept and its supporting technical system, has achieved a year-on-year increase of 32% in coalbed methane production, with a strong upward momentum, marking a leapfrog development in the development of deep unconventional natural gas.

当前，大吉气田已建成近40亿立方米/年的生产规模，依托4座集气站构成的枢纽网络，通过西气东输管道等关键通道，为华北地区近千万人口提供用气保障。

Currently, the Dagiji gas field has achieved a production capacity of nearly 4 billion cubic meters per year. Relying on a hub network consisting of four gathering stations, and through key channels such as the West-to-East Gas Pipeline, it supplies gas to nearly 10 million people in the North China region.

气田的快速上产，得益于全面应用“五步控压排采”理念及配套技术体系。深层煤岩气的开发模式与中浅层煤层气存在明显差异。

The rapid increase in production of the gas field is attributed to the comprehensive application of the "five-step controlled pressure drainage and production" concept and its supporting technical system. The development mode of deep coal rock gas differs significantly from that of medium and shallow coal seam gas.

为摸清开发规律，煤层气公司通过数值模拟、现场试验等方式，逐步揭示煤岩气井压裂后焖井及控压排采过程中的内在机理。以“渗吸置换”理论为指导形成的“五步控压排采”理念及配套技术体系，创新实践了以“焖井扩散促渗吸、控压稳流防闭合、调控促排提产量、精细管控延自喷、举升解堵保稳产、补能解吸控递减”为核心的技术系列，通过全方位优化采气工艺，有效保障深层煤岩气井稳产上产。

To understand the development patterns, the coalbed methane company used methods such as numerical simulation and field experiments to gradually reveal the internal mechanisms during the well fracturing and controlled pressure drainage process of coal rock gas wells. Based on the "permeation and replacement" theory, the concept and supporting technical system of "five-step controlled pressure drainage" were formed, and innovative practices were carried out with the core technology series centered on "diffusion during焖井 promotes permeation， controlled pressure maintains flow to prevent closure， regulation promotes drainage to increase production， precise control extends self-flowing period， lifting and unblocking ensure stable production， and replenishment and desorption control decline". Through comprehensive optimization of gas production processes， it effectively ensures stable and increased production of deep coal rock gas wells.

这一理念及配套技术体系应用于投产的51口试验井后，新井首年递减率由50%降至30%以下，自喷时间较前期投产井延长80%，预计年度节约措施费用3000万元，预测井均EUR（最终可采储量）增幅超17%。

After this concept and its supporting technical system were applied to the 51 test wells that were put into production, the decline rate of the new wells in the first year decreased from 50% to below 30%. The self-flowing time of these wells was extended by 80% compared to the earlier production wells. It is estimated that the annual cost savings will be 30 million yuan. The predicted increase in EUR (ultimate recoverable reserves) for each well is over 17%.