摘要
传统的原位修复药剂注入技术在低渗透场地上应用困难,药剂扩散效果不佳是修复工程普遍面临的挑战,将水力压裂、气动压裂-雾化喷射与直推钻进融合并实现注射模式切换,可显著提升原位注射装备针对复杂地层的适用性。采用自主研发的基于双通道钻具的原位直推钻进-喷注一体化装备在高、低渗透性不同的两个场地分别执行了中试,研究了气动压裂-雾化喷射、水力压裂功能的应用效果、不同渗透性地层条件下的注射影响半径以及适用的注射模式、工艺参数。结果表明,气动压裂-雾化喷射、水力压裂功能可显著改善在低渗透地层的渗透效果;高渗透性地层宜采用低压注射模式,药剂注射压力宜≤2.0 MPa,注射影响半径最大达3.67 m;中低渗透性地层采用低压注射+气动压裂-雾化喷射模式,雾化喷射实施压力宜不小于0.8 MPa,注射影响半径最大达2.36 m;低渗透性地层采用水力压裂+低压注射模式,水力压裂工作压力宜在10~15 MPa,注射影响半径最大达4.37 m。本中试为此类注射技术、装备在国内的首演,为未来原位直推钻进-喷注一体化装备在国内原位修复工程中的应用提供了依据。
Application difficulties and poor diffusion effect of reagents is a common challenge faced by traditional in situ injection technologies at low permeability sites.Integrating hydraulic fracturing,pneumatic fracturing-atomized jetting and direct push drilling,furthermore realizing switch among various injection modes,may significantly improve the applicability of in situ injection equipment to complex formations.Two pilot studies were conducted on sites with high and low permeability,respectively,using a self-developed doublechannel based in situ direct push drilling-jetting-injection integrated equipment.Effects of hydraulic fracturing,pneumatic fracturing-atomized jetting on low-permeability strata,injection radius of influence(ROI)of the integrated equipment,applicable injection modes and process parameters under various permeability conditions were investigated.Results demonstrated that pneumatic-atomized jetting and hydraulic fracturing could significantly improve the permeability of low-permeability formations.Low-pressure injection mode(≤2.0 MPa)was suitable for high-permeability strata;low-pressure injection plus pneumatic fracturing-atomization mode(≥0.8 MPa)was suitable for medium to low permeability strata;and hydraulic fracturing(10~15 MPa)followed by low-pressure injection mode was suitable for low permeability strata,with injection ROI up to 3.67,2.36 and 4.37 m achieved respectively under the above conditions.The pilot studies were the debut of such injection technology and equipment in China,providing the basis for future application of in situ direct push drillingjetting-injection integrated equipment in in situ remediation projects in China.
作者
葛传芹
单晖峰
王杰燚
朱水清
张左右
GE Chuanqin;SHAN Huifeng;WANG Jieyi;ZHU Shuiqing;ZHANG Zuoyou(DDBS Environmental Remediation Co.,Ltd,Nanjing 210012,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China)
出处
《环境工程学报》
北大核心
2025年第1期214-224,共11页
Chinese Journal of Environmental Engineering
基金
国家重点研发计划资助项目(2020YFC1807603)。
关键词
原位
直推钻进
水力压裂
气动压裂
雾化喷射
影响半径
in situ
direct push drilling
hydraulic fracturing
pneumatic fracturing
atomized jetting
radius of influence
