A kind of preparation method of polymer shale inhibitor for drilling fluid

Abstract

The invention discloses a preparation method of a polymer shale inhibitor for a drilling fluid. The polymer shale inhibitor is prepared from acrylamide, acrylic acid, potassium hydroxide and dimethyldiallylammonium chloride through an inverse emulsion polymerization technology, and optimum synthesis conditions are as follows: a weight part ratio of the acrylamide monomer to the acrylic acid monomer to the dimethyldiallylammonium chloride monomer is (70-80):(70-80):(15-75), the three monomers are processed to prepare an aqueous phase with the pH value being 10, 10 parts by weight of emulsifiers Sp-80 and T-60 are added to emulsify and disperse the aqueous phase in 100 parts by weight of white oil, and 1-3 parts of a stabilizer N,N'-dilauroyl ethylenediamine diethanesulfonate, the reaction temperature is 30-40 DEG C, the reaction time is 8 h, an oxidation / reduction initiator ratio of n(potassium persulfate):n(sodium hydrogen sulfite) is 1:1, and the weight part number of the initiator is 4. The product can be adsorbed on the surface of clay to form a semi-permeable membrane, has a strong coating effect, can effectively encase rock debris to weaken the hydration and dispersion effect, can compress a double electrode layer to prevent the hydration swelling of the clay, and has a prominent inhibition effect.

Description

technical field [0001] The invention relates to the field of preparation of polymer shale inhibitors for drilling fluid, and relates to a preparation method of a ternary polymer. Background technique [0002] During the drilling process, when drilling into a highly water-sensitive formation, the drilling fluid invades the shale layer, which will cause the shale to hydrate and expand, causing many downhole problems. In order to inhibit the hydration expansion of clay, the traditional method is to add potassium chloride, sodium chloride or divalent salt to the drilling fluid. loss, and affect the application effect of other treatment agents. [0003] Zwitterionic polyacrylamide emulsion is a kind of treatment agent for oil drilling industry that has developed rapidly in China in recent years. It can be used as oil field sewage treatment agent, thickener for oil field fracturing, oil displacement agent for tertiary oil recovery, etc. The molecular weight distribution is unifo...

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Problems solved by technology

In order to inhibit the hydration expansion of clay, the traditional method is to add potassium chloride, sodium chloride or divalent salts to the drilling fluid. loss, and affect the application effect of other treatment agents

[0003] Zwitterionic polyacrylamide emulsion is a kind of treatment agent for oil drilling industry that has developed rapidly in China in recent years. It can be used as oil field sewage treatment agent, thickener for oil field fracturing, oil displacement agent for tertiary oil recovery, etc. The molecular weight distribution is uniform and the dissolution speed is fast to form a uniform glue. It is effective in drilling and easy to use. However, there are few reports on improving the inhibition of drilling fluids, and most of them are still in the laboratory research stage. For its anti-slump There are very few studies on the mechanism of inhibition

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