柿子叶制备绿色水基钻井液处理剂及其作用效能研究

Preparation and Evaluation of Persimmon Leaf as Green Drilling Fluid Additive

将柿子叶粉末作为水基钻井液添加剂,性能评价结果表明,柿子叶粉末具有较好的增粘降滤失作用;随着老化温度的升高,柿子叶粉末处理水基钻井液作用效果先增大再减小后又增大,柿子叶粉末在水基钻井液中降滤失作用逐渐减弱,150℃失去降滤失作用。线性膨胀率实验表明,柿子叶粉末水提取液对膨润土的水化膨胀有一定的抑制作用,优于4%氯化钾溶液。配伍性实验结果表明,25℃下,柿子叶粉末与改性淀粉、KD-03、PAM体系钻井液配伍均表现出较好的降粘作用,120℃时均表现出增粘作用,其中与PAM配伍能缓解PAM对粘土的絮凝作用,能更好地维持钻井液性能稳定,且有降滤失作用。

The powder of Persimmon leaf was used as water-based drilling fluid addictive, and the performance of drilling fluids with Persimmon leaf was evaluated. The results showed that Persimmon leaf performed good thick property and effect of reducing fluid loss, and as the treatment temperature increasing, apparent viscosity and plastic viscosity was firstly increased and then reduced, finally increased, the filtration reduction weaken, and losing fluid loss function was 150℃. The results of linear bentonite swelling experiment and mud ball experiment presented that water extract of Persimmon leaf could inhibit hydration and swelling of clay along with the concentration, excelled to that of 4%（w） KCl solution. The results of compatibility with common drilling fluid additives showed that, at 25℃Persimmon leaf could reduce viscosity of modified starch, KD-03 and PAM drilling fluids;at 120℃the viscosity increased, meanwhile the PAM of flocculation was weaken, leading to be stable for the performances of drilling fluid companying with PAM, and it could control filtration.