煤层气田节能降本增效的干管互通式管网设计新思路

A new design concept of pipeline network with interconnected trunk lines for energy saving, cost reducing and efficiency increasing in CBM fields

沁水盆地的煤层气开发已经由早期的单井位部署模式改变为近期的多井井丛式部署模式,为了进一步优化该气田的煤层气集输系统,针对当前煤层气集输系统存在的“三高”(能耗高、投资高、设备闲置率高)问题,综合考虑系统开发和运行两个阶段的需求,建立了相应的经济效益计算模型与优化模型,结合经济技术分析与软件数值模拟,提出了“干管互通式管网”的新设计理念——在不同区块间建立铺设连通管线,使设备互为备用,有效地降低了设备闲置率。研究结果表明:①采用干管互通式管网设计新理念,可以实现采气系统的互通、互联,增加管网的灵活性,进而有效提升站场平均负荷率和设备利用率,提高系统运行效率,降低系统能耗,提高经济效益;②该理念在沁水盆地某区块4×108 m3/a产能建设中的应用效果表明,系统投资降低了20%,站场的平均负荷率提升了30%,系统运行效率提高了10%,运行能耗降低了20%,收益增加2000余万元。结论认为,该设计思路对今后煤层气田新区块开发建设具有重要的借鉴意义。

At present,coalbed methane(CBM)development in the Qinshui Basin has been transformed into multi-well cluster deployment mode from the earlier single-well deployment mode.In order to optimize the CBM gathering and transportation system in the Qinshui Basin further and deal with the"three highs"problem(high energy consumption,high investment and high idling rate of equipment)existing in the current CBM gathering and transportation system,with the demands of two stages(i.e.,system development and operation)taken into consideration comprehensively,this paper established the corresponding economic benefit calculation model and optimization model.Then,combined with the economic and technological analysis and software numerical simulation,a new design concept of"pipeline network with interconnected trunk lines"was put forward.That is to build and lay connecting pipelines between different blocks to make the equipment spare to each other,so that the idling rate of equipment can be reduced effectively.And the following research results were obtained.First,the adoption of the design concept of pipeline network with interconnected trunk lines can realize the interconnection of gas production systems and increase the flexibility of the pipeline network,so as to effectively increase the average station load rate,equipment utilization rate and operation efficiency,reduce energy consumption,and improve economic benefit.Second,the application effect of this concept to the productivity construction of 4×108 m3/a in a certain block of the Qinshui Basin shows that the investment in the system is reduced by 20%,the average station load rate increased by 30%,the operation efficiency increased by 10%,the operation energy consumption reduced by 20%,and the benefit increased by over CNY 20 million.In conclusion,this design concept is of an important guiding significance to the development and construction of new blocks in CBM fields in the future.