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A kind of high cationicity clay stabilizer and preparation method thereof
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A clay stabilizer, a technology of cationic degree, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of unsatisfactory anti-swelling effect, narrow application range, insufficient long-term effect, etc., and achieves inhibition of hydration swelling Migration, good anti-swelling effect, good anti-swelling effect
Active Publication Date: 2022-06-03
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology
[0005] In view of this, the present invention provides a clay stabilizer with high cationicity, which solves the problems of large dosage, narrow application range, unsatisfactory anti-swelling effect and insufficient long-term performance of existing clay stabilizers.
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Embodiment 1
[0032] 1. Composition of raw materials
[0033] In terms of mass components, it includes: 25 parts of dimethylamine, 51.4 parts of epichlorohydrin, 3.3 parts of polyethyleneimine, and 186 parts of water.
[0034] 2. Preparation steps
[0035] (1) Add dimethylamine to a three-necked flask with a stirring and reflux condenser, start the magnetic stirrer, cool in an ice-water bath, lower the temperature of dimethylamine to below 10°C, and keep the temperature for 5 minutes.
[0036] (2) Under stirring, add epichlorohydrin dropwise to the dimethylamine liquid cooled in the three-necked flask in step (1) with a constant pressure funnel, open the reflux condenser for reflux cooling, and control the dripping speed, The whole dropping time was about 1.5h, and the reaction temperature was controlled within the range of 10°C to 20°C.
[0037] (3) Mix polyethyleneimine with water to prepare a polyethyleneimine aqueous solution.
[0038] (4) After the dropwise addition of epichlorohydr...
Embodiment 2
[0040] 1. Composition of raw materials
[0041] In terms of mass components, it includes: 25 parts of dimethylamine, 102.8 parts of epichlorohydrin, 7 parts of polyethyleneimine, and 314.5 parts of water.
[0042] 2. Preparation steps
[0043] The first three steps are the same as those in Example 1, and the difference in step (4) is that the temperature is raised to 60° C., and the temperature is maintained for 6 hours to react to obtain the high cationic clay stabilizer of Example 2.
Embodiment 3
[0045] 1. Composition of raw materials
[0046] In terms of mass components, it includes: 25 parts of dimethylamine, 77.1 parts of epichlorohydrin, 5.9 parts of polyethyleneimine, and 252 parts of water.
[0047] 2. Preparation steps
[0048] The first three steps are the same as those in Example 1, and the difference in step (4) is that the temperature is raised to 70° C., and the temperature is maintained for 4 hours to react to obtain the high cationic clay stabilizer of Example 3.
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Abstract
The invention discloses a high cationic clay stabilizer and a preparation method thereof, wherein, the synthetic raw materials of the high cationic clay stabilizer include dimethylamine, epichlorohydrin, polyethyleneimine and water; the preparation method includes cooling dimethylamine; adding epichlorohydrin dropwise to the dimethylamine to carry out the first synthesis reaction; after the first synthesis reaction is finished, adding polyethyleneimine aqueous solution to the product of the first synthesis reaction It is obtained by carrying out the second synthesis reaction; it solves the problems that the existing clay stabilizer has a large dosage, narrow application range, unsatisfactory anti-swelling effect and insufficient long-term performance.
Description
technical field [0001] The invention relates to the field of petrochemical industry, in particular to a clay stabilizer which is used for adding during water injection in oil fields to prevent clay hydration and migration in strata and a preparation method thereof. Background technique [0002] In the process of oilfield operations, as long as the drilling fluid or production fluid (such as spacer fluid, perforation fluid, well flushing fluid, acidizing fluid, fracturing fluid, injection water, etc.) that can hydrate and expand clay is injected into the oil layer, it will cause clay water. The chemical expansion reduces the permeability, increases the oil flow resistance, and damages the formation. [0003] The cations electrolyzed by the clay stabilizer in the water base can be adsorbed on the surface of the clay particles by electrostatic action to reduce the negative charge of the clay particles, and can also be wrapped on the surface of the clay particles to inhibit the ...
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