泡沫排水采气技术在涪陵页岩气田的应用

Technologies of foam drainage gas recovery and their application to Fuling shale-gas field

为了使页岩气田各气井能够连续稳定生产,通过借鉴各大气田应用泡沫排水采气技术的经验,中国石化涪陵页岩气田率先在其低产能、中高含水的Y区块进行了泡沫排水采气现场探索试验。通过对比分析该区块4口气井措施前后的生产变化情况,对泡排剂的用量不断调整优化,最后现场试验取得了较好的效果,达到了预期目的,为该区块乃至整个气田的泡沫排水采气技术的适用性提供了借鉴与指导。研究结果表明:①泡沫排水采气技术能够较好地提高页岩气气井产量,降低水气比,有效减小气井的油套压差;②泡沫排水采气技术能够辅助其他措施对积液严重的页岩气井进行复产;③需要开展消泡工艺研究及药剂优选实验,建立起适合涪陵页岩气田的消泡方式;④排水采气工艺的推广应用需结合相关公司的发展理念,建立"环节精准"的技术研究思路,制定出标准化流程。

In Fuling shale-gas field,in order to ensure continuous and stable production for gas wells,Sinopec took the lead in carrying out some field experiments on foam drainage in Y block with low productivity and high to moderate water cut by means of certain foam drainage gas recovery technologies.After analyzing production situations of 4 shale-gas wells before and after an application of these technologies,the dosage of foam drainage agent was adjusted,optimized continuously until better effect was presented,and an expected aim was achieved,so as to provide guidance for their applicability to this block or even in the whole field.Results show that(1)these technologies can better improve shale-gas well production,and reduce water/gas ratio and tubing-casing pressure difference;(2)they can assist other measures to realize production restoration for those gas wells with serious liquid loading;(3)it's necessary to carry out another study on defoaming technology and chemical optimization experiments,and set up a defoaming mode suitable for Fuling gasfield;and(4)their application shall be based on company's development concept to establish technical ideas with“accurate link”and set up a standard process.