Clay stabilizer and preparation method thereof

Abstract

The invention belongs to the technical field of oilfield exploitation, and particularly relates to a clay stabilizer and a preparation method thereof. The preparation method comprises the following steps: adding triethylene diamine, 30wt% hydrochloric acid and ethanol into a reactor, slowly dropwise adding epoxy bromopropane, after dropwise adding, slowly heating to 50-55 DEG C, keeping the temperature, and carrying out reduced pressure distillation until the mixture is dry, so as to obtain a viscous intermediate; the method comprises the following steps: adding ethanol and tert-butylphosphine into a reactor, heating and refluxing, and carrying out reduced pressure distillation to dryness to obtain a crude product; and adding n-hexane into the crude product, heating for dissolving, filtering, cooling the filtrate to below 10 DEG C, separating out crystals, and drying in a drying oven at 100-120 DEG C overnight to obtain the product. The clay stabilizer has the advantages that the preparation process is simple, the anti-swelling rate is high, and the anti-swelling rate reaches 98% or above under the condition that the use concentration is 0.5 wt%; the highest temperature resistance reaches 350 DEG C or above, and the anti-swelling rate after water washing can reach 92% or above.

Description

technical field [0001] The invention belongs to the technical field of oilfield exploitation and relates to a clay stabilizer for water injection and a preparation method thereof, in particular to a clay stabilizer and a preparation method thereof. Background technique [0002] In the middle and late stage of oilfield exploitation, in order to maintain or increase the pressure of the oil layer and obtain a higher recovery factor, it is necessary to inject water into the oilfield and carry out secondary oil recovery. Some wells do not even inject water, thereby reducing the water flooding effect and affecting crude oil production and oilfield recovery. The main reason for this phenomenon is that the formation contains certain clay minerals, which are highly water-sensitive. In the implementation of water flooding, clay minerals are easy to swell, disperse and migrate in contact with water, thereby blocking the pore structure of the formation and reducing the formation permeab...

AI Technical Summary

Problems solved by technology

Although there is nitrogen element in the molecule of this patent, from the molecular structure, there is no cation, which has limited adsorption effect with negatively charged clay, so it will affect the anti-swelling effect

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