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对复合硅酸盐钻井液作了详细的室内实验研究 ,包括 :与常用钻井液和钻井液处理剂的配伍性 ,配方研究 (膨润土含量 ,护胶剂PTV加量 ,pH值 ,降粘手段 ,加药顺序 )和应用性能评定 (阻止压力传递 ,滤液中SiO2 含量 ,硅酸盐模数 ,硅酸盐加量与岩屑回收率 ,与其他体系钻井液抑制性比较 ,抗温、抗盐、抗钙性能 ,抗膨润土污染性能 ,加重钻井液 ,润滑剂的使用 ,电稳定性 ,岩心伤害 )。主要结论如下 :①硅酸盐对膨润土浆有降粘作用 ,与含有铵、钙等离子的处理剂如NH4 HPAN ,PMHC ,PAC141等不配伍 ;②硅酸盐必须与护胶剂一起加入淡水钻井液中 ;③pH值是影响哇酸盐钻井液性能特别是粘度的主要因素 (pH值应 >12 ) ,此外 ,护胶剂PTV含量、膨润土含量、硅酸盐模数及加量等对硅酸盐钻井液的流变性和滤失量有较大影响 ,聚合醇防塌润滑剂和表面活性剂ABS共用在改善硅酸盐钻井液润滑性能的同时 ,还能提高钻井液的高温稳定性 ;④配方适当的硅酸盐钻井液抗温、抗盐、抗钙、抗钻屑污染能力和封堵能力强 ,抑制性好 ,润滑性能好 ,稳定性好 ,保护储层的效果明显。报道了性能优良的硅酸盐钻井液的配方。
A detailed laboratory experiment on compound silicate drilling fluid has been carried out, including compatibility with common drilling fluid and drilling fluid treatment agent, formulation studies (bentonite content, PTV dosage, pH value, viscosity reduction means, The order of addition of drug and application performance evaluation (to prevent pressure transmission, SiO2 content in the filtrate, silicate modulus, silicate dosage and recovery of cuttings, compared with other systems of drilling fluid inhibition, temperature, salt, Anti-calcium properties, anti-bentonite soiling, heavier drilling fluids, use of lubricants, electrical stability, core damage). The main conclusions are as follows: ① Silicate has a viscosity reducing effect on bentonite slurry, which is incompatible with the treatment agents containing ammonium and calcium ions such as NH4 HPAN, PMHC, PAC141; ②The silicate must be added with fresh gel drilling fluid ; PH value is the main factor (pH value should be> 12) that affects the performance of the wow salt drilling fluid, especially the viscosity. In addition, the PTV content, bentonite content, silicate modulus, Drilling fluid rheology and fluid loss have a greater impact, polymer anti-collapse lubricant and surfactant ABS share to improve the lubricating performance of silicate drilling fluid, but also can improve the high temperature stability of drilling fluid; formula Appropriate silicate drilling fluid temperature, salt, calcium, drill cuttings pollution and sealing ability, good inhibition, good lubrication, good stability, the effect of reservoir protection is obvious. Reported the performance of silicate drilling fluid formulations.