煤层气排采远程自动控制平台的建立与应用

Establishment and application of a remote automatic control platform for CBM production

数据的远程监测已在煤层气井排采中得以应用,尽早实现煤层气井排采制度的远程调节和自动控制,对有效降低生产成本和提高煤层气井的精细化排采水平都具有重要意义。根据煤层气井生产动态特征,对排采远程控制技术进行了整体设计,结合自动化监控仪器仪表的特点,将煤层气井自动化排采分为见套压前、憋套压、初始产气和产气4个阶段,对煤层气井排采各阶段自动控制逻辑和方法进行了研究,开发了自控程序并将其嵌入现场控制终端,首次实现了对煤层气井产气量和产水量的自动精确调节,并率先采用了产气量和产水量联动控制的煤层气自动排采方式。结合生产网络和远程平台系统,通过远程制定下发排采指令,控制终端执行并反馈,实现了煤层气井排采远程自动控制。在陕西韩城地区的现场实践结果表明,自动控制平台的建立与应用有助于提高煤层气井精细化排采水平,从而实现煤层气井的连续、稳定排采。

Remote data monitoring has been applied in the production of CBM wells. It is necessary to realize remote regulating and automatic control on production systems of CBM wells as soon as possible, so that production cost can be reduced effectively and fine production of CBM wells can be improved. In this paper, remote production control technologies were designed based on production behaviors of CBM wells. And then, in light of the features of automatic monitoring instruments, automatic production of CBM wells were divided into four stages （i.e. before casing pressure occurring, casing pressure building, initial gas production and gas produc- tion）. Finally, an automatic control program was developed and embedded into field control terminals after study was carried out on automatic control logics and methods of each production stage of CBM wells. It is for the first time that gas and water production of CBM wells are automatically regulated precisely and automatic CBM production modes are adopted with the linkage control of gas and water production. Based on this production network and remote control platform system, terminal operation is controlled and fed back according to the production orders which are set and delivered remotely. In this way, CBM well production is automatically con- trolled over long distance. Practical operation results in the Hancheng area, Sbaanxi, shows that establishment and application of this automatic control platform contribute to the improvement of fine production of CBM wells and their continuous and stable production.