油基钻井液用粉状乳化剂性能评价

Performance Evaluation of Powdered Oil Base Mud Emulsifier

采用2,6-二氨基吡啶、有机胺、有机酸合成了油基钻井液用固体粉状乳化剂,该乳化剂熔点为120℃,HLB值为1.7,为玻璃态固体,易于粉碎。通过红外光谱对该乳化剂分子结构进行表征,从—CONH2吸收峰看出,合成过程中发生了酰胺化反应。对乳化剂在不同油水比钻井液中的乳化能力和柴油基、白油基钻井液配制效果进行了性能评价。结果表明,乳化剂的加量为3%时,其在不同油水比钻井液中具有良好的乳液稳定性,当油水比为7∶3时,乳液破乳电压大于600 V,乳化率为100%;抗温达180℃,钻井液破乳电压为625 V,提高黏度和切力效果好,动塑比在0.30 Pa/m Pa·s以上;热稳定性好,在150℃下连续老化48 h,流变性基本无变化,破乳电压大于700 V,表明该固体粉状乳化剂具有良好的乳化和抗高温性能。

A powdered emulsifier used in oil base drilling fluid is synthesized using 2, 6-diaminopyridine, amine and organic acids. It has melting point of 120 ℃ and HLB value of 1.7. As a vitrescentmaterial this emulsifier is easy to pulverize. Characterization of this emulsifier shows that amidation has taken place in the synthesis process, proved by the presence of –CONH2 peak in the IR spectrum. At a treatment of 3% in oil base drilling fluids with different oil/water ratios, good emulsion stability is obtained. Oil water emulsion with oil/water ratio of 7∶3 has emulsion stability(ES) voltage of 600 V and 100% emulsification. Oil base muds treated with this emulsifier have ES voltage of 625 V, temperature stability of 180 ℃ and YP/PV ratio of 0.30 Pa/m Pa·s. Newly prepared oil base muds treated with this emulsifier has stable properties after aging at 150 ℃ for 48 hours, and the ES voltage is greater than 700 V, indicating that this emulsifier has good emulsifying capacity and high temperature stability.