中国石油华北油田山西煤层气有序推进马必合作项目煤层气井氮气解堵增产现场施工，“注氮-憋压-放喷-复产”标准化作业流程有条不紊开展。9月8日，MB02-A4-10L-09等多口老井恢复产气能力，单井日产气量稳步回升，为中外合作煤层气项目增储上产积累了宝贵实践经验。

The Shanxi Coalbed Methane Project of the Huabei Oilfield of China National Petroleum Corporation is advancing the cooperation project with Maibi in an orderly manner. The on-site construction of nitrogen gas unblocking and production increase for the coalbed methane wells is proceeding in an orderly manner. The standardized operation process of "injecting nitrogen - applying pressure - releasing gas - resuming production" is carried out in an efficient and systematic way. On September 8th, multiple old wells, such as MB02-A4-10L-09, have regained their gas production capacity, and the daily gas production of each well has steadily increased, accumulating valuable practical experience for the joint coalbed methane project between China and foreign countries.

马必项目是亚美大陆煤层气有限公司与集团公司合作，在山西省沁水盆地南部马必区块开展的煤层气开发项目。该项目通过引入国际先进技术与管理经验，形成“中方主导、多元共享”合作管理模式，构建了“产能共建、技术共享、市场联动”的三大协同体系，为华北油田巩固国内最大中浅层煤层气田领先地位注入强劲动能。

The Ma Bi Project is a coalbed methane development project jointly carried out by Yamei Continental Coalbed Methane Co., Ltd. and the Group Company in the Ma Bi block in the southern part of the Qinshui Basin in Shanxi Province. Through the introduction of international advanced technologies and management experience, this project has established a "Chinese-led, diversified sharing" cooperation management model, and constructed three collaborative systems of "capacity construction cooperation, technology sharing, and market linkage", injecting strong impetus into the consolidation of the leading position of the largest shallow coalbed methane field in China in the North China Oilfield.

煤层气井不是“打出来”就一劳永逸，煤储层低孔低渗，煤粉就像血管里的血栓。随着排采周期延长，部分L型水平井在持续排采中出现煤粉堆积、割理裂隙被近井污染物封堵、产气通道“变细变小”的典型病症——日产气量下滑、动液面异常、泵效降低，常规检泵碰泵难以根治。想要把马必合作项目“沉睡气量”拿回来，必须确立“少伤害、快返排、通近井”的新治理思路。

Coalbed methane wells do not provide a permanent solution once they are drilled. The coal reservoirs have low porosity and low permeability, and the coal powder is like a blood clot in the blood vessels. As the production cycle lengthens, some L-type horizontal wells experience typical symptoms such as coal powder accumulation, fracture and fissure blockage by near-well pollutants, and the gas production channels becoming "thinner and smaller" - resulting in a decline in daily gas production, abnormal dynamic liquid level, and reduced pump efficiency. Conventional well inspection and pump replacement cannot cure these problems. To retrieve the "sleeping gas volume" of the Maibi cooperation project, a new management approach of "less damage, quick well flushing, and proximity well restoration" must be established.

本次增产措施主攻方向，正是行业验证成熟的氮气泡沫洗井/注氮解堵工艺。华北油田依托与亚美能源在沁水区块多年积累的排采动态数据库与自动化管控经验，对目标井开展生产工况“体检”，比对日产气、日产水突变指数与历史生产曲线，精准甄别煤粉堵塞、近井污染问题井，落实“一井一策”定制施工方案。其中MB02-A4-10L-09井单井日产气量由1800立方米提升至2600立方米，日增气量800立方米，增产效果显著。

The main focus of this production increase measure is the nitrogen foam well cleaning/ nitrogen injection for blockage removal technology that has been proven effective in the industry. The North China Oilfield, leveraging the dynamic database and automation control experience accumulated over many years with Amer Energy in the Qinshui block, conducted a production condition "checkup" on the target wells. By comparing the sudden changes in daily gas and water production with historical production curves, they accurately identified wells with coal powder blockage and near-well pollution problems, and implemented customized construction plans for each well. Among them, the daily gas production of Well MB02-A4-10L-09 increased from 1800 cubic meters to 2600 cubic meters, with an increase of 800 cubic meters, achieving a significant production increase.

氮气解堵看似是一口井的小手术，实则是合作项目全生命周期管理的必答题。作为中外合作煤层气开发的样板，马必合作项目始终坚持“安全、合规、低碳、企地共赢”。此次氮气解堵措施全部采用汽化氮气闭环作业，无化学残液入地，返出煤粉集中处置。自措施实施以来，这个项目试验井组响应积极，多口井由“气水双低”恢复至稳定产气，部分潜力井日产气量恢复并超过措施前水平，泵况稳定性改善，检泵周期拉长，运维成本同步下降。

The nitrogen gas unblocking operation may seem like a simple procedure for a single well, but in fact, it is a necessary task in the full life cycle management of the cooperation project. As a model for Sino-foreign coalbed methane development cooperation, the Ma Bi cooperation project has always adhered to the principles of "safety, compliance, low carbon, and win-win for the enterprise and the local community". This time, all the nitrogen gas unblocking measures were carried out using closed-loop operation of vaporized nitrogen, with no chemical residues entering the ground, and the returned coal powder was centrally disposed. Since the implementation of these measures, the test well groups of this project have responded positively. Many wells have recovered from "low gas and water production" to stable gas production. Some potential wells have restored their gas production and exceeded the levels before the measures. The pump condition stability has improved, the inspection pump cycle has been extended, and the operation and maintenance costs have decreased simultaneously.

下一步，华北油田将以本次氮气解堵成功实践为示范，结合合作项目单井生产实际，精准筛选适配该工艺的生产井，持续激活老井产能，统筹推进解堵治理与二次改造、智能排采、集输增压等工作，在马必南区合作项目持续推广应用，为对外合作项目增添上产新动力。

Next, the North China Oilfield will take the successful nitrogen gas unblocking practice as a model, combined with the actual production of each well in the cooperation project, precisely select the production wells that are suitable for this technology, continuously activate the production capacity of old wells, and comprehensively promote the unblocking treatment and secondary renovation, intelligent drainage and extraction, and booster pumping of gathering and transportation, etc. In the cooperation project of Ma Bi Nan area, it will be continuously promoted and applied, adding new production impetus to the external cooperation projects.