摘要
洛河组砂岩采动地层涌水频繁,严重影响了矿井安全生产。针对传统注浆体系面临渗滤效应严重和成胶性能不可控,难以实现裂隙出水有效调控的技术难题,通过分析5种天然典型岩心样品(含砾砂岩、巨粒砂岩、粗粒砂岩、中粒砂岩、细粒砂岩)的矿物组成及微观形貌,明确了孔隙微观赋存特征,构建了低成本、稳定性优异的无固相冻胶注浆体系。通过物理模拟驱替实验研究了冻胶注浆体系的注入性和封堵性能,通过核磁共振在线驱替实验研究了注浆封堵前后岩心中的孔隙分布变化特征。结果表明,孔隙直径小和孔喉连通性差是造成传统注浆体系难以顺利注入和深部运移的地质原因。由于渗滤效应的存在,传统注浆体系的固化封堵效果明显低于理论设计。以0.5%~0.6%聚丙烯酰胺、0.6%~0.7%有机胺类单体交联剂、0.07%~0.08%酚类单体交联剂和0.2%~0.3%有机酸类调节剂为原料,构建了低成本、无固相、易深部注入的新型冻胶注浆体系。该冻胶注浆体系可实现48h内成胶,180d内未见明显脱水,长期老化稳定性优异。冻胶注浆体系的注入性良好,持续冲刷岩心后的压力衰减率为7.85%~20.95%,封堵率为82.04%~92.19%。冻胶注浆体系通过占据大孔道或裂缝空间,增大渗流阻力,迫使后续流体转向,实现出水层有效封堵。该研究成果可为洛河组砂岩注浆堵水施工提供新思路。
The frequent water gushing in sandstone mining strata of Luohe Formation has seriously affected the safety production of the mine.The traditional grouting systems are faced with the problems of serious percolation effect and uncontrollable gelation performance,which is difficult to achieve effective regulation of fissure water.In this work,the microscopic characteristics of sandstone pores were clarified by analyzing the mineral composition and microscopic morphology of five typical natural core samples,such as gravel-bearing sandstone,giant sandstone,coarse-grained sandstone,medium-grained sandstone,and fine-grained sandstone.A solid-free gel system with low cost and excellent stability was constructed for grouting.The injectivity and plugging performance of the gel grouting system were studied by physical simulation displacement experiment.The pore distribution characteristics in the core before and after grouting were studied by nuclear magnetic resonance online displacement experiment.The results showed that the small pore diameter and poor connectivity were the geological reasons for the difficulty of smooth injection and long-distance migration of the traditional grouting systems.Due to the existence of percolation effect,the curing and plugging effect of traditional grouting system was obviously lower than that of theoretical design.A novel gel grouting system with low cost,solid-free,good injection,and long-distance migration performance was constructed by using 0.5%—0.6% polyacrylamide,0.6%—0.7% organic amine monomer crosslinking agent,0.07%—0.08% phenolic monomer crosslinking agent and 0.2%—0.3% organic acid regulator as raw materials.The gel grouting system could achieve gelation within 48 h,meanwhile,had no obvious dehydration within 180 days,showing excellent long-term aging stability.The gel grouting system had good injectivity.The pressure attenuation ratio was 7.85%—20.95%,meanwhile,the plugging ratio was 82.04%—92.19% after continuous flooding.The gel grouting system increased the seepage resistance and blocked the subsequent fluid by occupying the large channel or fracture space,which realized the effective plugging of the water layer.The research results could provide new ideas for the grouting and water plugging construction of sandstone in Luohe Formation sandstone.
作者
李嘉鸣
吕东方
赵金忠
赵光
戴彩丽
LI Jiaming;LYU Dongfang;ZHAO Jinzhong;ZHAO Guang;DAI Caili(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2024年第2期229-237,共9页
Oilfield Chemistry
基金
山东省泰山学者攀登计划项目“油田化学与提高采收率”(项目编号tspd20161004)
关键词
洛河组砂岩
低渗透
无固相
冻胶
注浆
封堵
Luohe Formation sandstone
low permeability
solid-free
polymer gel
grouting
plugging
