深层煤层气返排液用无固相一体化悬浮液的研究  

Study on an All-in-One Solid-Free Suspension as Flow-Back Fluid for Deep Coal-Bed Methane Development

作　　者：张瀚 李小江 朱卫平 徐栋 孟令鹏 贾振福 ZHANG Han;LI Xiaojiang;ZHU Weiping;XU Dong;MENG Lingpeng;JIA Zhenfu(Chongqing University of Science and Technology School of Chemistry and Chemical Engineering,ChongQing 401331;Institute of Engineering Technology,PetroChina Coalbed Methane Company Limited,Xi'an,Shaanxi 710082)

机构地区：[1]重庆科技大学化学化工学院,重庆401331 [2]中石油煤层气有限责任公司工程技术研究院,西安710082

出　　处：《钻井液与完井液》2024年第6期800-805,共6页Drilling Fluid & Completion Fluid

基　　金：重庆市教委科学技术研究项目“CO_(2)开关溶剂萃取分离含油固废的双循环机制研究”(KJQN202301511);重庆科技学院科研项目“基于低共熔溶剂构建CO_(2)双开关微乳液及油-固分离循环技术研究”(ckrc202212052)。

摘　　要：由于深层煤层气压裂液返排液矿化度高、成分复杂、难以重复,而目前的悬浮液基压裂液体系固含量较高,易对致密煤层造成严重伤害。因此,该研究以油溶性聚合物ZL-1作为稳定剂,白油作为溶剂,依次添加聚丙烯酰胺减阻剂AE,激活剂异丙醇,转相剂OPE-10,配制无固相一体化悬浮液。利用单因素控制变量法确定各组分种类筛选,并结合正交实验,确定悬浮体系配方为65%白油、1.3%稳定剂、3.25%转相剂、0.455%激活剂、30%减阻剂。评价了悬浮压裂液的综合性能。测试结果表明,在200 g/L矿化度下,无固相悬浮液配制压裂液比与传统含膨润土稳定剂的悬浮液压裂液的表观黏度增加了40%,通过SEM与Zeta电位及纳米粒度分析仪证明:无固相悬浮压裂液的致密层片状结构,具有更好的耐盐屏蔽效应。此外,无固相悬浮压裂液破胶后无残渣,对煤样渗透率的平均伤害率小于15%,可成功应用于深层煤层气高矿化度返排液重复配液。The flowback fluid of a fracturing fluid for fracturing formations containing deep buried coalbed methane(CBM)has high salinity and complex components,and is therefore hard to be reused.The suspension based fracturing fluids widely used in present have high solids contents which can cause serious damage to tight coal beds.To deal with these problems,a solids-free integrated suspension has been developed with an oil-soluble polymer ZL-1 as the stabilizer,white oil as the solvent,and into the solvent add the following additives one by one:a polyacrylamide drag-reducer AE,an isopropanol initiator and OPE-10 as the phase change material(PCM).The single-factor control variable method is used in determining the type of each of the components for the reaction;using the orthogonal experiment method,the optimum composition of the suspension is determined as:65%white oil,1.3%stabilizer,3.25%PCM,0.455%initiator,30%drag reducer.Results of the evaluation of the general performance of the suspension show that at a salinity of 200 g/L,the apparent viscosity of a fracturing fluid made from the solids-free suspension is 40%higher than the apparent viscosity of a fracturing fluid made from the conventional suspensions containing bentonite stabilizers.SEM analysis,Zeta potential measurement and nanometer particle size analysis prove that the dense layered structure formed in the solids-free suspension fracturing fluid has better salt-resistant shielding effect.Moreover,after gel breaking,the solids-free suspension fracturing fluid has no residue remained,the average permeability damage of the solids-free suspension fracturing fluid to the coal samples is less than 15%,and is therefore reusable in deep coalbed methane fracturing.

关 键 词：煤层气 压裂液 返排液 悬浮液 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]