渤中沙河街原油析蜡及其乳化特性实验研究

EXPERIMENTAL STUDY ON WAX CRYSTALLIZATION AND EMULSIFICATION OF SHJ CRUDE OIL, BOZHONG OIL BLOCK

针对渤中沙河街原油海底管道输送的潜在安全隐患,采用影像分析仪及配套的程控水浴,观测和分析了沙河街原油从65℃到20℃的析蜡过程,确定了其析蜡点与析蜡高峰温度范围。采用HAAKERS600流变仪,测定了沙河街原油及其掺高温水的油水乳状液的流变曲线与粘温曲线,评价了沙河街原油的乳化特性。结果表明沙河街原油的析蜡点与粘温异常点分别为51℃与30℃,析蜡高峰温度为35~20℃;当掺水量低于70%时,80℃的沙河街油水混合液在25℃的室温下自然冷却,同时用700~800r/min的转速搅拌,在2h内均可充分乳化,其反相点为70%,这为沙河街原油海底管道掺高温水输送的安全操作提供了依据,并可供其他原油的相关研究参考。

In view of the hidden-trouble of SHJ(Sha Hejie)crude oil transported safely through offshore pipeline in Bozhong oil Block, the wax crystallization of SHJ crude oil is observed and analyzed by using an image analysis system and necceary programin water bath at the temperature range from 65℃ to 20℃, and then its wax precipitation point and the peak temperature are determined. The rheological and emulsified properties of SHJ crude oil and its emulsions formed with the produced water of a nearby water source well are measured and evaluated by using a HAAKE RS600 rheometer. The experimental results indicate that the wax appearance point and viscosity-abnormal point of the oil is 51℃ and 30℃ respectively, and its wax precipitation peak temperature is between 35℃ and 20℃. While the amount of added water is below 70%, the mixture of oil and water, stirred at 700-800 r/min within 2 hours and cooled naturally from 80℃ at 25℃ room temperature, can be emulsified completely. The inverted point of the emulsion is about 70%. The experimental methods can provide the related research for a reference and the results provide a guide to the safe operation of SHJ crude oil transported by adding some high temperature water.