棉浆黑液-酚醛复合凝胶堵剂的制备与性能评价

Preparation and Performance Evaluation of Cotton Pulp Black Liquor-phenolic Resin Composite Gel Plugging System

为有效利用棉浆黑液、减少环境污染,以碱法棉浆黑液、苯酚、甲醛和聚丙烯酰胺为原料,通过水热法制备了黑液-酚醛复合凝胶,通过红外光谱、热重分析和扫描电镜对凝胶结构进行了表征,研究了苯酚加量对凝胶的影响,评价了凝胶的耐盐性、耐酸碱腐蚀性和封堵效果。结果表明,黑液-酚醛复合凝胶网络致密紧凑,热分解温度为200℃。苯酚加量为2%~4%的凝胶的成胶时间为24~14 h,含水率为72%~75%,吸水倍数为3.60%~3.92%。该凝胶具有黏度低、易泵入的优点,且具有良好的耐盐、耐酸碱性能。凝胶的封堵效果良好,对人工模拟岩心的封堵率大于99%。利用棉短绒黑液制备油田堵剂,不仅可以改善黑液污染,还可降低稠油开采成本。图4表3参13.

In order to effectively utilize cotton pulp black liquor and reduce environmental pollution,the black liquor-phenolic resin composite gel was prepared by hydrothermal method with alkaline cotton pulp black liquor,phenol,formaldehyde and polyacrylamide as raw materials.The gel was characterized by FT-IR,TG-DTG and SEM.The effect of phenol addition on the gel was studied,and the salt tolerance,acid and alkali resistance and blocking effect of the gel were evaluated.The results showed that the network of black liquor-phenolic resin gel was compact and the thermal decomposition temperature was 200℃.The gelation time of the gel with 2%—4%phenol addition was 24—14 h,the moisture content was 72%—75%,and the water absorption ratio was 3.60%—3.92%.The gel had the advantages of low viscosity,easy pumping,good salt tolerance,and acid and alkaline resistance.The sealing effect of gel was good.The sealing rate of artificial simulated core was more than 99%.Preparation of plugging agent by black liquor from cotton fleece could not only improve the pollution of black liquor,but also reduce the exploitation cost of heavy oil.