有机颗粒高温封堵体系的研制与性能评价

目前稠油油藏的开采方式主要以热采为主,针对稠油热采过程中出现的汽窜现象,研究了一种耐温耐盐蒸汽封堵体系。确定了最佳配方为:1%沥青粉颗粒+0.7%胍胶+0.05%表面活性剂复配体系(十六烷基三甲基氯化铵、十六烷基三甲基溴化铵质量比2∶3),研究了该体系的耐温耐盐性能、高温封堵性能、耐冲刷性能及油水选择性封堵能力。研究表明:该蒸汽封堵体系在高温高盐条件下析水率不超过20%。同时该堵剂具有较好的耐盐性能,使用矿化度为100 g/L的地层水配制堵剂的析水率小于30%。沥青粉颗粒高温堵剂对不同渗透率岩心的封堵率均能保持在90%以上,且注入蒸汽长时间冲刷后封堵率降低率低于3%,具有较好的耐冲刷性能。沥青粉颗粒高温堵剂具有较好的选择性封堵能力,对水层的封堵率可以达到85%以上,而对油层的封堵率低于20%。

Prepration and Performance Evaluation of Organic Particle Heat Resistant Plugging System

At present,the main exploitation way of heavy oil is thermal production.Aiming at the steam channeling during the thermal production,a temperature-resistant and salt-resistant steam plugging system was studied.The best formula was determined as follows:1%asphalt powder particles+0.7%guar gum+0.05%surfactant compound system(mass ratio of cetyl trimethyl ammonium chloride to cetyl trimethyl ammonium bromide was 2∶3).The temperature and salt resistance,high temperature blocking performance,erosion resistance and oil-water selective blocking ability of the system were investigated.The experimental results showed that the steam plugging system had a water separation rate of less than 20%under high temperature and high salt conditions.At the same time,the plugging agent had good salt resistance.The water separation rate of the plugging agent prepared with formation water with a salinity of 100 g/L was less than 30%.The plugging rate of asphalt powder particle high-temperature plugging agent for cores with different permeability could be maintained above 90%,and the plugging rate reduction rate after long-term scouring with steam injection was less than 3%,exhibiting a good erosion resistance.Asphalt powder particle plugging agent had good selective plugging ability,the plugging rate for water layers could reach over 85%,while the plugging rate for oil layers was less than 20%.