含B-O螺环的特种表面活性剂作为钻井液润滑剂的可行性研究

The Feasibility Study for B-O Spiro Compound of Special Surfactants as Drilling Fluid Lubricant

李 辉 史 俊 卢永斌 李建东 张永强

LI Hui SHI Jun LU Yong-Bin LI Jian-Dong ZHANG Yong-Qiang

自制表面活性剂REB、RDB含有单B-O螺环（REB含羟基），ROB含有双B-O螺环。3种表面活性剂的表面活性较好，REB、RDB、ROB的临界胶束浓度（ccmc）分别为2.7×10-4、1.0×10-3、0.8×10-4 mol/L，γcmc分别为29.6、20.8、28.3 mN/m。在基浆中加入1.0% REB、RDB、ROB，可使滤饼的黏滞系数（Kf）从0.1944分别降至0.1139、0.1051、0.1139。加入ROB的基浆起泡严重，基浆密度小于0.7 g/cm3，不适宜作为钻井液润滑剂。含0.5% REB基浆的Kf在常温和80℃热滚16 h后的值分别为0.1495和0.2123，耐温性较差。含1.0% RDB基浆热滚前后的Kf分别为0.1228和0.1495，抗温性较好。含1.0% RDB基浆在加入4% NaCl前后的Kf分别为0.1228和0.1317，抗盐性较好。可作为钻井液用润滑剂。

Home-made surfactant REB with hydroxyl, RDB contained a single B-O spiro and ROB contained double B-O spiro. The critical micelle concentration (ccmc) of REB, RDB and ROB was 2.7×10-4, 1×10-3 and 0.8×10-4 mol/L, and γcmc of that was 29.6, 20.8 and 28.3 mN/m, respectively, which indicated good surface activity. When 1% REB, RDB or ROB was added to the mud, the viscosity coefficient of filter cake (Kf) decreased from 0.1944 to 0.1139, 0.1051 or 0.1139 respectively. Medium slurry adding ROB foamed severely whose density was less than 0.7 g/cm3. ROB was not suitable as a lubricant for drilling fluid. The Kf value of slurry containing 0.5% REB was 0.1495 and 0.2123 at room temperature and after 16 h rolling at 80℃, which showed poor heat resistance performance. The Kf value of slurry containing 1% RDB before and after hot rolling was 0.1228 and 0.1495, which showed good heat resistance performance. The Kf value of slurry containing 1% RDB was 0.1228 and 0.1317 before and after adding 4% NaCl, which showed good salt tolerance. RDB could be used as drilling fluid lubricant.