煤层氮气泡沫压裂液研究与应用  

Research and application of nitrogen foam fracturing fluid in coalbed methane

作　　者：杨兆中[1] 彭鹏[1] 张健[2] 李小刚[1] 路艳军[1] 刘敏[3] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中联煤层气有限责任公司,北京100011 [3]中国石化西南石油工程有限公司井下作业分公司,四川德阳618000

出　　处：《油气藏评价与开发》2016年第1期78-82,共5页Petroleum Reservoir Evaluation and Development

基　　金：国家重大专项"增产改造材料研制及完井工艺研究"(2011ZX05042-002-001)

摘　　要：针对我国煤层活性水压裂携砂困难、排采周期长,高黏压裂液伤害高的问题,提出了低伤害、低成本的泡沫压裂液配合低成本石英砂使用的压裂设计思路。并从室内实验出发对泡沫压裂液的内相(气体)和外相(盐水以及起泡剂、稳泡剂)进行室内优选,结合沁水盆地煤岩心流动实验确定了KCl(1%)+起泡剂LY-18(0.7%)+水的氮气泡沫压裂液体系。通过现场试验表明:与该区块其他活性水压裂效果相比,氮气泡沫压裂缩短了煤层气见气时间,提高了该地区的见气概率,整体经济效益良好。因此,低伤害的氮气泡沫压裂液作为少水压裂而言,不仅实现了地下与地面的双层环保,还在一定程度上提高了煤层气的开发效益,具有广泛的推广意义。According to the problems occured in CBM, such as hard sand carrying capability of active water fracturing, long production cycle time, high damage of high viscosity fracturing fluid, the fracturing design idea of low damage and low cost foam fracturing fluid with low cost quartz sand is proposed. Based on the laboratory experiment, indoor optimization of foam fracturing fluid is conducted, which involved internal phase gas and external phase saline, foaming agent and foam stabilizer. In addition, combined with coal core flow experiment in Qinshui basin, the nitrogen foam fracturing fluid system of nitrogen foam fracturing fluid system of KCl（1 %）＋foaming agent LY-18（0.7 %）＋water was determined. The field tests show that, compared with the other active water fracturing effects in this block, nitrogen foam fracturing reduces gas breakthrough time, improves gas breakthrough probability, and achieves good economic effects. Therefore, as used for low water fracturing, low damage nitrogen foam fracturing fluid not only achieves double environmental protection of both underground and ground, but also improves CBM exploitation benefits in a certain degree. In a word, nitrogen foam fracturing fluid is worth to be widely popularized.

关 键 词：煤层气 水力压裂 氮气泡沫压裂液 低伤害 

分 类 号：TE371[石油与天然气工程—油气田开发工程]