Slurry overflowing prevention drilling fluid

The invention discloses slurry overflowing prevention drilling fluid, which is prepared from the following raw materials in parts by weight: 1m < 3 > of drilling fluid primary slurry, 2 to 4kg of hard solid crushed particles, 2 to 6kg of soft fine materials, 1.5 to 2.5 kg of lubricating agents, 1.0 to 2kg of foaming agents and 1.0 to 2kg of foam stabilizers, 1 m < 3 > of the drilling fluid raw slurry is prepared from the following raw materials: 1000 kg of water, 40-60 kg of sodium bentonite powder, 1-3 kg of a viscosity improving agent and 4-6 kg of a filtrate reducer. The anti-slurry-overflowing drilling fluid has the performance characteristics of high plugging property, high flowability, low density, high lubricity and the like, and can be applied to low-pressure stratums with weak stability and gap development. 本发明公开了一种防冒浆钻进液，包括下列重量份的原料：钻进液原浆：1m3，坚硬固体碎粒：2～4kg，软质细小材料：2～6kg，润滑剂：1.5～2.5kg，发泡剂：1.0～2kg，稳泡剂：1.0～2kg；所述1m3的钻进液原浆是由下列原料制成：水1000kg，钠基膨润土粉40～60kg，提粘剂1～3kg，降滤失剂4～6kg。本发明的防冒浆钻进液具有封堵性强、流动性强、密度低、润滑性强等性能特点