Hydroxyl film-forming plugging agent for drilling fluid and preparation method thereof

Abstract

The invention discloses a hydroxyl film-forming plugging agent for drilling fluid and a preparation method of the hydroxyl film-forming plugging agent. The hydroxyl film-forming plugging agent for thedrilling fluid is prepared from the following components: magnetic chitosan microspheres, polyacrylic acid hydrogel, N-isopropylacrylamide, N, N-methylene bisacrylamide, sodium persulfate, N, N, N ',N'-tetramethylethylenediamine, carboxymethyl cellulose, nano calcium carbonate, a dispersing agent, a hydroxyl compound and polyacrylamide hydrogel; wherein the hydroxyl compound is prepared from complexing alcohol GPH-II, nano silicon dioxide, polyhydroxy resin WN2-1 and polyanionic cellulose. The hydroxyl film-forming plugging agent for the drilling fluid has the advantages of reducing the filter loss, stabilizing the well wall, avoiding differential pressure jamming, being high in suspension chip-carrying capacity, good in rheological property and plugging effect, capable of deforming to plug shale nanopores and microcracks, non-toxic, free of environmental pollution, free of stratum pollution and good in compatibility.

Description

technical field [0001] The invention relates to the technical field of additives for drilling fluids, in particular to a hydroxyl film-forming plugging agent for drilling fluids and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and society, the contradiction between supply and demand of oil and natural gas has become increasingly prominent. Oil and gas extraction is developing towards deep, ultra-deep formations, and unconventional formations, and mining is becoming more and more difficult. In the process of oil and gas production, the problem of wellbore instability has become increasingly prominent. Borehole wall instability will increase the complex situation in the drilling process, delay the progress of the project, cause significant economic losses, and seriously restrict the rapid development of my country's oil and gas drilling technology. A major technical measure. [0003] The existing water-based f...

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Problems solved by technology

[0006] The existing nano-blocking agent uses SiO 2 The mixture with SiOx microcrystalline particles can be wrapped by sulfonated styrene and butadiene copolymers, but in this method, nano-inorganic particles and surface organic molecular segments are only combined macroscopically, and the plugging agent is relatively rigid. , loose contact between particles and formations, particles and particles, easy to detach again, affecting the plugging effect

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