Study and application of compound sustained-release mud cake scavenger

The compound sustained-release mud cake scavenger is compound with a series of different chain length of alkyl and aromatic synthetic organic and inorganic additives which can be produced by hydroxyl radicals. The clearance rate of this cake scavenger is from 90.3 8% to 100% within the temperature of 30 °C to 180 °C, the degradation rate of high-viscosity polymer is over 97.30% at 50 °C, the clearance rate of mud cake is over 95.79% in inhibitive, silicon-based, composite metal ion and environmentally friendly drilling fluid, and the recovery rate of core permeability reaches 94.3%. The production and injection of this mud cake scavenger is remarkable in transformation of oil well plugging.