环保型生物质合成树脂降滤失剂

绿色高性能钻井液已经成为发展趋势，降滤失剂作为核心处理剂，不仅要求其抗温、抗盐和降滤失性能好，还要求其易生物降解。以木质素为原料，经生物降解和化学反应得到生物质合成树脂降滤失剂LDR-501。性能测试结果表明:LDR-501的BOD₅/COD_Cr为0.26，可生物降解；EC₅₀为440 000 mg/L，无毒；浊点盐度为160 g/L，用其处理的基浆在180℃老化16 h后的高温高压滤失量为18.6 mL，抗温、抗盐、降滤失性能好。环保型生物质合成树脂降滤失剂的成功研发，为促进生物质资源在钻井液领域的应用，提高水基钻井液绿色环保性奠定了基础。 

A Synthetic Resin Filter Loss Reducer Made from Environmentally Friendly Biomasses

With more and more stringent environment protection requirements imposed on the petroleum exploration industry, drilling fluid additives are required to be nontoxic and have high performance. As the core additive of drilling fluids, filter loss reducer is required to have properties such as high temperature resistance, salt resistance, good filtration control performance, lowor nontoxicity, and good biodegradation. Using lignin as a raw material, a biomass synthetic resin filter loss reducer, LDR-501, was produced through biodegradation and chemical reaction. Evaluation of LDR-501 showed that the BOD₅/COD_Cr value is 0.26, indicating that LDR-501 is biodegradable. The EC₅₀ of LDR-501 is 440 000 mg/L, and the cloud point salinity of LDR-501 is 160 g/L. A base mud treated with LDR-501 had HTHP filtration rate of 18.6 mL after aging at 180℃ for 16 h, indicating that LDR-501 has good high temperature resistance, salinity resistance and good filtration control performance. The development of LDR-501 has accelerated the application of biomass resources in drilling fluid industry and laid the foundation of improving the environmental friendliness of water base drilling fluids.