Fluid loss reducer for drilling fluid and preparation method thereof

Abstract

The invention discloses a fluid loss reducer for drilling fluid which can realize resistance to salt to saturation, more than 5% of calcium, strong anti-pollution ability and low manufacturing cost while ensuring high temperature resistance and a preparation method thereof. The fluid loss reducer used in the drilling fluid consists of 20% to 40% of AMPS, 20% to 40% of N-isopropylacrylamide, 10% to 20% of acrylamide, and 10% to 20% of pyrrolidone in terms of weight percentage. 20%, 8% to 11% of sodium p-styrene sulfonate, 0.2% to 0.4% of ammonium persulfate, and 0.1% to 0.3% of sodium bisulfite. The preparation method comprises the steps of uniformly mixing AMPS, N-isopropylacrylamide, and acrylamide, adding an appropriate amount of sodium hydroxide solution, then adding pyrrolidone, sodium p-styrenesulfonate, ammonium persulfate, and sodium bisulfite, and mixing Evenly heat to 45°C~55°C, react for 5~7h, dry and pulverize. The fluid loss reducer for drilling fluid has high salt resistance and high temperature resistance, and at the same time has a calcium resistance of more than 5%, and strong pollution resistance; meanwhile, the preparation method is simple, convenient for production and low in production cost.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid and a preparation method thereof, in particular to a modified resin fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] Well-known: Filtrate reducer for drilling fluid (fluidloss reducers), also known as fluid loss reducer, is an external additive used to reduce the liquid-phase fluid loss of drilling fluid or the loss of liquid-phase leakage into the formation. agent. Classified by chemical composition, fluid loss reducers can be divided into minerals, natural organic substances and their modified substances (such as lignite lye, pregelatinized or modified starch), synthetic organic substances (such as methyl cellulose and polyester) Acrylates), etc. [0003] The existing fluid loss reducers for drilling fluids have the following problems: ① poor temperature resistance, especially 200 degrees Celsius; ② poor resistance to saturated brin...

AI Technical Summary

Problems solved by technology

[0003] Existing fluid loss additives for drilling fluids have the following problems: ① poor temperature resistance, especially 200 degrees Celsius; ② poor resistance to saturated brine

[0005] Although the fluid loss reducer for drilling fluid described in the above invention patent has good ability to resist saturated brine and high temperature, its components are complicated and the manufacturing cost is relatively high

Images