Multifunctional accessory ingredient of drilling fluid

Abstract

The invention discloses a multifunctional accessory ingredient of a drilling fluid. The multifunctional accessory ingredient is composed of anionic cellulose sodium salt, graphite powder, potassium humate, potassium chloride, small cations, polyacrylonitrile salt, a middle-molecular polymer and a synergist, wherein the production process of the middle-molecular polymer comprises the following steps of: firstly, mixing acrylic acid and acrylic amide according to the weight ratio of 55:45, and distilling and dehydrating to form a mixture for later use; and respectively adding sodium sulfate and maleic anhydride into the mixture, and then, carrying out polymerization reaction and grafting to obtain the middle-molecular polymer, wherein the sodium sulfate accounts for 40% of the weight of the mixture and the maleic anhydride accounts for 60% of the weight of the mixture. The synergist is composed of the following raw materials in weight ratio: 20% of ethanediamine, 30% of hydrogen peroxide, 40% of vinyl monomers and 10% of plasticizer, and is obtained through mixing the raw materials and reacting at the temperature of 80 DEG C for 4h.

Description

technical field [0001] The invention relates to the field of raw materials for oil well drilling, in particular to a multifunctional drilling fluid additive. Background technique [0002] Petroleum raw materials need to be drilled, and drilling fluid is used in the drilling process. Drilling fluid tends to thicken at high temperature, and tends to become thinner when it meets water, which often leads to the failure of normal drilling and delays in the construction period. In the deep underground, the temperature will continue to rise with the increase of the drilling depth. At present, the highest temperature resistance of the drilling fluid used in my country is 180 ° C, which cannot meet the requirements of high-depth drilling. The work efficiency is low, and a large amount of drilling fluid needs to be continuously invested in order to continue to work normally, resulting in excessive use of raw materials and a large amount of cost. Contents of the invention [0003] I...

AI Technical Summary

Problems solved by technology

[0002] Petroleum raw materials need to be drilled and mined. Drilling fluid is needed during the drilling process. Drilling fluid tends to thicken at high temperature and becomes thinner when it meets water, which often causes the drilling to fail to operate normally and delays the construction period.

In the deep underground, the temperature will continue to rise with the increase of the drilling depth. At present, the drilling fluid used in my country has a maximum temperature resistance of 180°C, which cannot meet the requirements of high-depth drilling. The work efficiency is low, and a large amount of drilling fluid needs to be continuously invested in order to continue to work normally, resulting in excessive use of raw materials and a large cost

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