钻井液对HDD黏土层力学性能作用机理研究  

Study on the Mechanism of the Action of HDD Drilling Fluid on the Mechanical Properties of Clay Stratum

作　　者：梁小强 孙平贺[3,4] 胡达 黎永索[1] 韦帮第 Liang Xiaoqiang;Sun Pinghe;Hu Da;Li Yongsuo;Wei Bangdi(Hunan Engineering Research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure,Hunan City University,Yiyang,Hunan 413000,P.R.China;School of Civil Engineering,Hunan City University,Yiyang,Hunan 413000,P.R.China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environmental Monitoring,Ministry of Education,Central South University,Changsha 410083,P.R.China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,P.R.China)

机构地区：[1]湖南城市学院、城市地下基础设施结构安全与防灾湖南省工程研究中心,湖南益阳413000 [2]湖南城市学院土木工程学院,湖南益阳413000 [3]中南大学、有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083 [4]中南大学地球科学与信息物理学院,长沙410083

出　　处：《地下空间与工程学报》2023年第1期157-164,共8页Chinese Journal of Underground Space and Engineering

基　　金：湖南省科技厅自科基金(2021JJ50147,2021JJ30078);益阳市科技计划(2020YR02,2019YR02)。

摘　　要：为从宏细观角度研究不同种类钻井液与黏土地层重塑样作用前后力学特性的演化机理,对与重塑样作用后的钻井液进行阳离子测试,通过阳离子交换容量测试确定试验后钻井液中的阳离子交换容量,并使用Correl函数对钻井液的阳离子相关参数及重塑样的孔隙参数和力学参数进行了相关性分析。结果表明:在水基钻井液中,重塑样的孔隙率与钻井液的阳离子交换容量及溶液中游离的阳离子浓度的相关系数均趋近于-1,即阳离子交换容量及溶液中游离的阳离子浓度越大,试验后重塑样的孔隙率越小,力学性质越好。核磁共振扫描图像结果表明:3号水基固相钻井液对重塑样水化膨胀的抑制与孔隙封堵作用最好,重塑样的力学性能最佳。After remodeling the sample,the drilling fluid was tested to determine the cations.The cation exchange capacity test determined the drilling fluid content after the experiment to study the evolution mechanism of the mechanical properties of drilling fluids before and after remodeling the clay formation samples from a macro and mesoscopic perspective.The correl function is used to analyze the correlation between the cation-related parameters of the drilling fluid and the pore and mechanical parameters of the remodeled sample.The results of waterbased drilling fluid show that the correlation coefficient between the porosity of the remodeled sample and the cation exchange capacity of the drilling fluid and the free cation concentration in the solution is close to-1.That indicates that the cation exchange capacity and the free cation concentration in the solution are negatively correlated.After the experiment,the porosity of the reshaped sample decreased with increasing concentration,and the mechanical characteristics improved.The MRI scanning images show that:No.3 water-based solid-phase drilling fluid has the best effect on the inhibition of hydration expansion and pore sealing of the remodeled sample,and the mechanical properties of the remodeled sample are more optimum.

关 键 词：阳离子交换容量 黏土地层重塑样 力学特性 核磁共振扫描 

分 类 号：TU193[建筑科学—建筑理论] P634.6[天文地球—地质矿产勘探]