Coating agent polymer curing resin for drilling fluid

Abstract

High-polymer curing resin of a coating agent for a drilling fluid is prepared from raw materials as follows: 800-1,000 parts of clear water, 100-120 parts of vegetable gum, 0.5-1.0 part of a catalyst,0.2-0.7 parts of an initiator, 80-100 parts of 2-acryloylamino-2-methallyl sulfonate, 30-50 parts of N,N-dimethylacrylamide, 10-20 parts of 4-vinylpyridine, a pH regulator, 3-7 parts of talc powder and 2-5 parts of calcium carbonate, wherein the dosage of the pH regulator should meet the requirements for pH value of a solution after regulation; the vegetable gum is water-soluble vegetable gum; the catalyst is sulfuric acid; the initiator is one or two of an ammonium persulfate-sodium hydrogen sulfite system and a potassium persulfate-sodium hydrogen sulfite system. At the high temperature of200 DEG C, the resin has good coating inhibition performance, and the rolling recovery rate of mud shale can reach 90%; the high-polymer curing resin has good salt and calcium pollution resistance, filtrate loss reduction ability and capability of improving rheological property of the drilling fluid. A preparation process is simple, low in cost, good in environmental protection effect and wide inapplication range.

Description

technical field [0001] The invention relates to a coating agent for drilling fluid, in particular to a polymer solidified resin for the coating agent for drilling fluid, which belongs to petroleum drilling aids. The invention also relates to a preparation method of the coating agent polymer curing resin for drilling fluid. Background technique [0002] Coating agent is a commonly used treatment agent in water-based drilling fluid. It mainly achieves the purpose of inhibiting the dispersion of cuttings by coating and adsorbing on the surface of cuttings. It also has the properties of stabilizing the well wall, regulating flow patterns and reducing water loss. At present, there are many types of coating agents on the market, but there are still problems such as unsatisfactory coating inhibition, poor temperature and salt resistance, and environmental protection standards. [0003] The inventor retrieved the following relevant non-patent literature: The author Jiang Guancheng ...

AI Technical Summary

Problems solved by technology

But the reaction operation is cumbersome and not suitable for mass production

CN106279522A provides a kind of instant-type low-molecular-weight polyacrylamide coating agent, the operation adopts the inverse emulsion polymerization process, and the coating inhibition effect is good, but the lack of temperature-resistant and salt-resistant groups in the molecule causes the temperature-resistant and salt-resistant properties of the product to be relatively low. Poor; inverse emulsion polymerization uses organic solvents, is flammable, and has low effective production capacity

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