杂化硅防塌剂的合成与性能评价

Synthesis and Performance Evaluation of Hybrid Silicon Anti-sloughing Agent

为了既保持硅酸盐优良的防塌性能,又减轻或消除硅酸盐对钻井液体系流变性的影响,通过同步修饰法用C_2H_3OSiCl_3对二氧化硅进行表面修饰后,再与山梨醇进行杂化反应合成了杂化硅防塌剂,研究了杂化硅防塌剂与常用处理剂配制的钻井液体系的流变性和防塌性能。结果表明,二氧化硅表面修饰的适宜反应条件为:室温、pH=8、2 mol/L正硅酸乙酯、25%C_2H_3OSiCl_3、胶凝时间为2 h;杂化硅防塌剂具有有机/无机杂化结构。杂化硅防塌钻井液体系的流变性良好,抗温达150℃,阻缓压力传递的效果明显,防塌效果优于两性离子聚合物钻井液和聚丙烯酸钾钻井液体系。

In order to keep the excellent anti-collapse properties of silicate, and reduce or eliminate the effects of silicate on the rheology of drilling fluid system, hybrid silicon anti-sloughing agent was synthesized by surface modification with C2H3OSIC13 and then hybridization reaction with sorbitol. The rheological and anti-sloughing properties of drilling fluid prepared by hybrid silicon anti-sloughing agent and common agents were studied. The results showed that the optimum surface modified condition of silicon oxide was obtained as follows： room temperature, pH=8,2 mol/L tetraethylorthosilicate concentration and 25% C2H3OSIC13 volume fraction, 2 h gel time. Hybrid silicon anti-sloughing agent had organic/inorganic hybrid structure. The theology of hybrid silicon anti-sloughing drilling fluid was good, the effect of preventing pressure transmission was obvious, and the resistance temperature was 150℃. The collapse prevention effect of hybrid silicon anti-sloughing drilling fluid was better than that of zwitterionic polymer drilling fluid and potassium polyacrylate drilling fluid.