一煤层低伤害氮气泡沫压裂液研究中国石油大学.pdfVIP

2013年摇 第37卷摇 摇 摇 摇 摇 摇 中国石油大学学报(自然科学版)摇 摇 摇 摇 摇 摇 摇 摇 Vol.37摇 No.5 摇 第5期摇 摇 摇 摇 摇 摇 摇 摇 Journal of China University of Petroleum摇 摇 摇 摇 摇 摇 摇 摇 Oct.2013 摇 摇 文章编号:1673鄄5005(2013)05鄄0100鄄07摇 摇 摇 doi:10.3969/ j.issn.1673鄄5005.2013.05.015 煤一层低伤害氮气泡沫压裂液研究 李兆敏, 吕其超,李松岩,李宾飞,孙摇 乾 (中国石油大学石油工程学院,山东青岛266580) 摘要:随着煤层气开发规模不断扩大,在煤层压裂增产过程中压裂液滤失量高、地层伤害严重、返排困难且压裂效果 差等问题不断凸显。 结合煤层气储层物性,研制低伤害氮气泡沫压裂液体系,即0郾5%YSJ杀菌剂+1%FP鄄1复合起 泡剂+2%KCl 防膨剂+N 。 对该氮气泡沫压裂液体系进行滤失试验和分散试验研究。 结果表明:该泡沫压裂液体系 2 起泡及稳泡性能良好,耐剪切能力强,携砂能力强;泡沫和气液两相滤饼的封堵作用可以明显降低压裂液的滤失量, 并且氮气可以增强压裂液的返排能力;压裂液体系中的表面活性剂可以降低煤粉与水相的界面张力,提高压裂液对 煤粉的分散能力;相对于常规压裂液体系,氮气泡沫压裂液体系对煤层气岩心的伤害较小。 关键词:煤层气;氮气泡沫;压裂液;动态滤失;低伤害 中图分类号:TE357摇 摇 摇 文献标志码:A A nitrogen foam fluid with low formation damage for CBM fracturing treatment LI Zhao鄄min,L譈 Qi鄄chao,LI Song鄄yan,LI Bin鄄fei,SUN Qian (School of Petroleum Engineering in China University of Petroleum,Qingdao266580,China) Abstract:Fracturing treatment is essential for the development of coalbed methane(CBM) fields. In the fracturing of coal seams,high filtration loss,seriousformation damage,low flow鄄back andpoor efficiencywerethemainproblemswhenusing conventional water鄄basedfracturing fluids. A nitrogen foamfracturing fluid system with low formation damagewas developed based on the geological features of CBM reservoirs. Theformula of thefoamfluid mainly includes a bactericidal agent,foa鄄 ming surfactants and clay stabilizers. Filtration loss,dispersion,and microscopic foaming experiments were conducted for testing the capacitiesof thefluid system asafoaming andfracturingfluid. Experimental results show that thefracturingfluid has a goodfoaming ability andfoam stability,excellent shearingbearingability,strong sandca