抗高温高密度低毒油包水钻井液的乳化剂优选和研制

为了成功地钻探高温超压复杂地层和满足环境保护的需求,研究使用抗高温高密度低毒油包水乳化钻井液是非常必要的,其中乳化剂的优选和研制是决定钻井液稳定性和抗温能力的关键。利用破乳电压法和离心法评价了乳化剂的乳化效果,通过高温陈化评价了乳化液的高温稳定性,用自制高温高压电稳定仪测定了乳状液在高温高压下的稳定性。实验确定了以有机酸和有机酰胺为主乳化剂,十二烷基苯磺酸纳为辅乳化剂的乳化剂组成,并优选了其加量。结果表明所确定的乳化剂配制的乳状液及高密度乳化钻井液具有良好的稳定性和抗温能力。

OPTIMIZATION AND DEVELOPMENT OF EMULSIFIERS USED IN INVERT OIL-EMULSION DRILLING FLUID WITH HIGH TEMPERATURE,HIGH DENSITY AND LOWTOXICITY

In order to penetrate the formation with high temperature and pressure successfully and protect the environment,it is nec-essary to study an invert oil-emulsion drilling fluid which can withstand high temperature and has high density and low toxic-ity. Optimum seeking and development of emulsifiers are very important in stabilizing the drilling fluids and enhancing its property of resisting elevated temperature. In this paper,the emulsification was tested by electrical stability and centrifugal method. Aging or measuring its electrical stability in high tem-perature and pressure evaluated the temperature stability. It was determined that the emulsifiers are composed of organicacids,amides and alkyl benzene sulfonates(ABS). Results show that the emulsion and high-density emulsion drilling fluid have good stability in elevated temperature.