A kind of amide polymer shale inhibitor for drilling fluid and preparation method thereof

Abstract

The invention provides an amide polymer shale inhibitor for drilling fluid. The amide polymer shale inhibitor is characterized by being prepared from, by mass, 10%-20% of acrylamide, 5%-10% of 300# liquid wax, 10%-20% of hexadecyl dimethyl benzyl ammonium chloride, 2%-8% of dimethyl diallyl ammonium chloride, 20%-30% of methacryloyloxyethyl trimethyl ammonium chloride, 15%-25% of acrylic acid, 2%-5% of emulsifiers, 0.03%-0.6% of an initiator and 20%-40% of water, wherein the emulsifiers are any two of Span60, Tween80, Span80, Tween60 and hexadecyl trimethyl ammonium bromide, and the initiator is any one of ammonium persulfate-ethanol, ammonium persulfate-pentaerythritol, ammonium persulfate-sodium hydrogen sulfite and ammonium persulfate-sodium sulfite. By means of a synergistic effect of chemical inhibiting and enveloping and blocking of hydrophobic groups, the good inhibition effects can be achieved, integral inhibition is achieved, and the problem that an original shale inhibitor is bad in inhibition effect under the complex condition is solved.

Description

Technical field [0001] The invention relates to the field of oil and gas well exploitation, in particular to an amide polymer shale inhibitor for drilling fluid and a preparation method thereof. Background technique [0002] In the process of oil and gas drilling, the worldwide problem of borehole instability in shale formations has been plagued by many petroleum engineering and technical personnel. The well collapse and diameter reduction caused by the instability of the borehole wall will not only cause obstacles in tripping, stuck drilling, increased torque, and pump hold-up, but also cause the drilling tool to fall, the wellbore trajectory deflection or the whole hole Scrap of the well. [0003] As the country has increased its efforts in the exploration and development of shale gas resources in recent years, the issue of wellbore stability is facing more severe challenges. Although shale gas drilling usually uses oil-based drilling fluids to alleviate the instability of the ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an amide polymer shale inhibitor for drilling fluid and a preparation method thereof, which solves the above-mentioned deficiencies in the prior art, and achieves excellent inhibition through the synergistic effect of chemical inhibition and hydrophobic group coating blocking. effect, achieve overall suppression, and solve the problem of poor suppression effect of previous shale inhibitors in complex situations

Images