Potassium metasilicate polymeric alcohol water base drilling fluid

The invention relates to a potassium metasilicate polymeric alcohol water base drilling fluid for preventing collapse and tool sticking in oil and gas field drilling operation. The drilling fluid overcomes complex situations easily caused by high temperature and pressure under a deep well and a super deep well. A technical scheme is as below: raw materials for preparing the drilling fluid comprise 40-60 parts of sodium bentonite, 40-60 parts of powder instant potassium metasilicate, 3-6 parts of tackifier, 4-6 parts of fluid loss additive, 20-40 parts of plugging agent, 8-13 parts of KCl and 1000 parts of tap water, wherein a NaOH adjusting system has a pH of 11.5. A preparation method of the drilling fluid comprises the following steps: taking 1000g of tap water; adding sodium bentonite, powder instant potassium metasilicate, tackifier, fluid loss additive, plugging agent and KCl; adjusting a pH to 11.5 by a 40% NaOH and continuing stirring for 15 min to obtain the potassium metasilicate polymeric alcohol water base drilling fluid. The product of the invention has good rheological property, water loss wall-building property, strong inhibition, good plugging capability, good lubricity and good heat stability, and can satisfy requirements of safe well drilling under complex conditions.