强化泡沫驱采出液破乳影响因素分析

Analysis on influencing factors of demulsification of enhanced foam flooding produced fluid

针对西部某稠油油藏强化泡沫驱采出液破乳脱水时间长、脱水效率低等问题,通过制备模拟乳状液,分析了破乳剂、泡沫剂、稳泡剂(改性聚合物)等因素对破乳效果的影响,再进一步通过拟合曲线法,考察各组分对脱水速率的影响。结果表明:增大破乳剂用量,脱水程度增加,脱水速度加快,有利于破乳;而增大泡沫剂或聚合物浓度,脱水程度和脱水速率均显著降低,严重影响破乳效果。当破乳剂用量为200 mg/L时,泡沫剂和聚合物含量不得大于300 mg/L;当泡沫剂和聚合物用量达400 mg/L时,200 mg/L破乳剂的脱水率仅有63.3%,脱水速率下降6%~14%,此时需500 mg/L破乳剂加量才能满足脱水要求。

Contraposing to the problems of long demulsification and dehydration time and low dehydration efficiency existed in enhanced foam flooding produced fluid in a heavy oil reservoir in West China,the effects of demulsifier,foam agent,foam stabilizer( modified polymer)on demulsification were studied by preparing simulated emulsion. Furthermore,the effect of components on dehydration rate was investigated by fitting curve method. The results showed that the degree of dehydration and the dehydration rate accelerated with the increasing of demulsifier,which was beneficial to demulsification,but decreased significantly with the increasing of foaming agent or polymer,which seriously affected the demulsification effect. In addition,when demulsifier concentration was 200mg/L,the content of foaming agent and polymer should not exceed 300 mg/L,when the concentration of foam agent or polymer reached 400 mg/L,the dehydration rate of 200 mg/L demulsifier was only 63.3%,and the dehydration rate decreased by 6%-14%,At this time,the demulsifier dosage needed 500 mg/L to meet the dehydration requirements.