环保型聚合物钻井液抗温增效剂的研制与性能评价*

Development and Performance Evaluation of Heat-resistant Synergist for Environment-friendly Polymer Drilling Fluid

梁文利

LIANG Wenli

针对当前聚合物钻井液处理剂抗温性能较差，无法满足深层、超深层高温钻井要求，以及环保对部分磺化 材料的使用受限等问题，以N，N-二甲基胺、草酸、CA催化剂为单体，通过优化合成单体配比、反应温度和时间， 利用溶液聚合方法制备了抗温增效剂HAS，评价了HAS在包被剂聚丙烯酰胺钾盐KPAM、抗高温聚合物增黏降滤失剂driscal-D、抗温抗盐增黏剂BDV-200S等10余种聚合物溶液、低黏羧甲基纤维素钠盐LV-CMC膨润土钻井液、聚合物氯化钾钻井液体系中的抗温增效性能，并采用生物发光细菌法检测了HAS的生物毒性。研究结果表明，N，N-二甲基胺、草酸、CA催化剂摩尔比1∶3∶2、反应温度70℃、反应时间8 h的条件下制备的HAS产率最高， 达98%。抗温增效剂HAS对大部分聚合物溶液具有明显的抗温增效作用，能将BDV-200S聚合物的抗温能力由180℃提高到220℃以上，将LV-CMC膨润土钻井液的抗温能力由80℃提高至150℃，聚合物氯化钾钻井液体系的抗温能力可达150℃。加入HAS后钻井液的流变性能稳定、黏度保留率高，与老化前相当，API滤失量降低了50% 以上，抑制性能大幅度提高。该增效剂经过生物发光细菌法测定EC50为 2.76×105 mg/L，无生物毒性。表8参10

The temperature resistance of the current polymer drilling fluid treatment agents is poor and cannot meet the requirements of deep and ultra-deep high temperature drilling. In addition，the sulfonated materials is limited because of environment protection. Using N，N-dimethylamine，oxalic acid，and CA catalyst as the main raw materials，the temperature-resistant synergist HAS was prepared by optimizing the monomer ratio，reaction temperature and time. The temperature resistance and synergistic performance of HAS in more than 10 kinds of polymer solutions such as the coating agent polyacrylamide potassium salt KPAM，high temperature resistant polymer viscosity increasing fluid loss agent driscal-D，temperature resistant salt resistant viscosity increasing agent BDV-200S，and in low viscosity carboxymethyl cellulose sodium salt LV-CMC bentonite drilling fluid，polymer potassium chloride drilling fluid，was evaluated. Furtherly，the biological toxicity of HAS was detected by the bioluminescence bacteria method. The results showed that when the molar ratio of N，N-dimethylamine to oxalic acid to CA catalyst was 1∶3∶2，the reaction temperature was 70℃ and the reaction time was 8 hours，the yield of HAS prepared was the highest，reaching up to 98%. The temperature-resistant synergist HAS had an obvious temperature-resistant synergistic effect on most polymer solutions，which could increase the temperature resistance of BDV-200S polymer from 180℃ to more than 220℃ ，and the temperature resistance of LV-CMC bentonite drilling fluid from 80℃ to 150℃，the temperature resistance of the polymer potassium chloride drilling fluid system reached up to 150℃. After adding HAS，the drilling fluid had stable rheological properties and high viscosity retention， which was equivalent to that before aging. The API fluid loss was reduced by more than 50%，and inhibition performance was improved greatly. The EC50 of HAS，measured by the bioluminescent bacteria method，was 2.76 × 105 mg/L，indicated that HAS had no biological toxicity.

10.19346/j.cnki.1000-4092.2020.02.001