一种耐高温油溶性暂堵剂的制备及性能研究

Preparation and performance of a high temperature resistant oil-soluble temporary plugging agent

利用不同质量比的沥青、古玛隆树脂和碳九石油树脂高温熔融后合成2种耐高温的油溶性暂堵剂OBZD-1和OBZD-2,并进行了油溶性、分散性、耐盐性和耐温性实验;还借助岩心流动实验探究了暂堵剂的注入浓度、注入量和油藏温度对暂堵剂的暂堵和解堵效果的影响。结果表明:2种暂堵剂的油溶性和耐温、耐盐性好,携带介质中的HPAM的质量分数为0.3%时,暂堵剂OBZD-1的分散稳定性好。随着暂堵剂质量分数和注入量的增大,暂堵率逐渐增大,解堵率逐渐减小;油溶性暂堵剂OBZD-1的暂堵率与油藏温度成反比,解堵率与油藏温度成正比。在质量分数为3%~5%,注入量为2PV^3PV时,暂堵率可达到93%以上,解堵率达到90%以上。

Two kinds of high temperature resistant oil-soluble temporary plugging agents,OBZD-1and OBZD-2,are prepared using different quality ratio of asphalt,coumarone resin and carbon nine petroleum resin as raw materials. The oil soluble rate,dispersing performance,salt resistance and temperature tolerance properties are evaluated. The effects of injection concentration,injection volume and reservoir temperature on the temporary plugging rate and plugging removal rate of oil soluble temporary plugging agent are studied through core flow experiment. The results show that two prepared oil soluble temporary plugging agents have good oil soluble rate,salt resistance and temperature tolerance property. The temporary plugging agent OBZD-1 has good dispersion stability when the HPAM concentration is 0. 3%. By increasing injection concentration and injection volume of the temporary plugging agent,temporary plugging rate is gradually increased and plugging removal rate is gradually decreased. The temporary plugging rate of oil-soluble temporary plugging agent OBZD-1 is inversely proportional to the reservoir temperature,but the plugging removal rate is proportional to the reservoir temperature. The temporary plugging rate and the plugging removal rate could reach above 93% and 90%,respectively,when the injection concentration is 3%- 5% and injection volume is 2- 3 PV. The temporary plugging agent OBZD-1 could realize the temporary plugging property effectively at 140℃ of high temperature reservoir and has good application prospect.