A
petroleum drilling additive high temperature-resistant filtrate
reducer and a preparation method thereof. The filtrate
reducer is prepared by the following raw materials by weight: a
humic acid-containing substance,
sodium pyrosulfite, water, organic
silicon resin, a cross-linking agent,
potassium hydroxide, AMPS, alpha-
methylglucoside. The preparation method of the filtrate
reducer comprises the following steps: weighing water,
potassium hydroxide, lignite or
peat or weathered
coal,
sodium pyrosulfite according to the weight parts, adding into a stirring reaction vessel, sealing, heating, reacting, cooling; adding organic
silicon resins, cross-linking agents, AMPS, alpha-
methylglucoside weighed according to the weight parts into the stirring reaction vessel, sealing, heating, stirring and reacting; discharging the materials,
drying the product to obtain a finished product. The finished product can
resist a high temperature of 220 DEG C, can
resist saturated brine and
seawater, effectively reduces drilling mud
filtration loss, does not cause tackification, and thus solves the problems of
temperature resistance and
salt resistance of mud in deep well, ultra-deep
well drilling.