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Clay stabilizer and preparation method thereof

A technology of clay stabilizer and triethylenediamine, which is applied in the field of clay stabilizer and its preparation, clay stabilizer for water injection and its preparation, can solve the problems of affecting anti-swelling effect and limited adsorption effect, and achieve reservoir adaptability Strong, high anti-expansion rate, the effect of less dosage

Pending Publication Date: 2022-07-29
SHOUGUANG XINHAI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Clay stabilizer and preparation method thereof
  • Clay stabilizer and preparation method thereof
  • Clay stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 0.1mol triethylenediamine, 0.2mol 30wt% hydrochloric acid, 56g ethanol to the reactor, slowly add 0.26mol epibromopropane dropwise, complete the dropwise addition, slowly heat up to 50°C, keep the temperature for 4h, and distill under reduced pressure to dryness to obtain a viscous intermediate;

[0031] (2) 112g of ethanol and 0.2mol of tert-butylphosphine were added in the reactor, heated to reflux for 24h, and distilled to dryness under reduced pressure to obtain a crude product;

[0032] (3) add 67.2g of n-hexane in the crude product, heat up to dissolve, filter, cool the filtrate to below 10°C, separate out crystals, and dry in 100°C oven overnight to obtain product Q 1 .

Embodiment 2

[0034] (1) Add 0.1mol triethylenediamine, 0.26mol 30wt% hydrochloric acid, 224g ethanol in the reactor, slowly add 0.2mol epibromopropane dropwise, complete the dropwise addition, slowly heat up to 55°C, keep the temperature for 8h, and distill under reduced pressure to dryness to obtain a viscous intermediate;

[0035] (2) 336g of ethanol and 0.24mol of tert-butylphosphine were added in the reactor, heated to reflux for 72h, and distilled to dryness under reduced pressure to obtain a crude product;

[0036] (3) add 112g n-hexane in crude product, heat up and dissolve, filter, cool the filtrate to below 10 ℃, separate out crystal, 120 ℃ of oven drying overnight, obtain product Q 2 .

Embodiment 3

[0038] (1) Add 0.1mol triethylenediamine, 0.22mol 30wt% hydrochloric acid, 88g ethanol in the reactor, slowly add 0.25mol epibromopropane dropwise, complete the dropwise addition, slowly heat up to 52°C, keep the temperature for 5h, and distill under reduced pressure to dryness to obtain a viscous intermediate;

[0039] (2) 180g of ethanol and 0.21mol of tert-butylphosphine were added in the reactor, heated to reflux for 36h, and distilled to dryness under reduced pressure to obtain a crude product;

[0040] (3) add 74g n-hexane in the crude product, heat up and dissolve, filter, the filtrate is cooled to below 10 ℃, separate out crystal, 120 ℃ of oven oven dry overnight, obtain product Q 3 .

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6561C09K8/035
CPCC07F9/6561C09K8/035C09K2208/12
Inventor 王卫信周建华任洪帅李长伟寇俊风
Owner SHOUGUANG XINHAI ENERGY TECH CO LTD
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