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Discharge aiding agent for acid fracturing and preparation method of discharge aiding agent

A technology of acidizing fracturing and drainage aids, which is applied in the direction of chemical instruments and methods, organic chemistry, and drilling compositions. The effect of low dosage, simple synthesis and preparation process

Active Publication Date: 2022-07-26
SHOUGUANG XINHAI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of this drainage aid is relatively large, and the effect is difficult to guarantee

Method used

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  • Discharge aiding agent for acid fracturing and preparation method of discharge aiding agent
  • Discharge aiding agent for acid fracturing and preparation method of discharge aiding agent
  • Discharge aiding agent for acid fracturing and preparation method of discharge aiding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) 0.05mol piperazine (4.32g), 0.10mol sodium p-formaldehyde benzene sulfonate, 0.10mol sodium cyanoborohydride, 12.96g methanol, 0.216g 30wt% hydrochloric acid were sequentially added to the first reactor, while stirring Heating, refluxing for 4h, adding 1M sodium hydroxide solution to adjust pH3-5;

[0038] (2) in above-mentioned mixed solution, add 12.96g chloroform, extract, evaporate to dryness by rotary evaporator, obtain intermediate product;

[0039] (3) above-mentioned intermediate product was transferred to the second reactor with 16.88g ethanol, 0.09mol bromobutane was added, heated to reflux for 4h, and evaporated to dryness by rotary evaporator to obtain crude product;

[0040] (4) Add 12.96g of n-hexane to the above crude product, heat up to dissolve, filter, cool the filtrate to below 10°C, separate out crystals, filter, and dry at 80°C for 3 hours to obtain the product, a drainage aid S for acid fracturing. 1 .

Embodiment 2

[0042] (1) 0.05mol piperazine (4.32g), 0.13mol sodium p-formaldehyde benzene sulfonate, 0.13mol sodium cyanoborohydride, 43.2g methanol, 0.864g 30wt% hydrochloric acid were successively added to the first reactor, while stirring Heating, refluxing for 6h, adding 1M sodium hydroxide solution to adjust pH3-5;

[0043] (2) in above-mentioned mixed solution, add 43.2g chloroform, extract, evaporate to dryness by rotary evaporator, obtain intermediate product;

[0044] (3) above-mentioned intermediate product was transferred to the second reactor with 43.2g ethanol, added 0.12mol bromododecane, heated to reflux for 7h, evaporated to dryness by rotary evaporator to obtain crude product;

[0045] (4) Add 34.56g of n-hexane to the above crude product, heat up to dissolve, filter, cool the filtrate to below 10°C, separate out crystals, filter, and dry at 90°C for 2 hours to obtain the product, a drainage aid S for acid fracturing. 2 .

Embodiment 3

[0047](1) 0.05mol piperazine (4.32g), 0.111mol sodium p-formaldehyde benzene sulfonate, 0.112mol sodium cyanoborohydride, 20.16g methanol, 0.39g 30wt% hydrochloric acid were successively added to the first reactor, while stirring Heating, refluxing for 8h, adding 1M sodium hydroxide solution to adjust pH3-5;

[0048] (2) in above-mentioned mixed solution, add 20.88g chloroform, extract, evaporate to dryness by rotary evaporator, obtain intermediate product;

[0049] (3) above-mentioned intermediate product is transferred to the second reactor with 12.96g ethanol, adds 0.099mol bromododecane, heats under reflux for 8h, and evaporates to dryness by rotary evaporator to obtain crude product;

[0050] (4) Add 18.44g of n-hexane to the above crude product, heat up to dissolve, filter, cool the filtrate to below 10°C, separate out crystals, filter, and dry at 80°C for 2 hours to obtain the product, a drainage aid S for acid fracturing. 3 .

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a cleanup additive for acid fracturing and a preparation method of the cleanup additive. The preparation method comprises the following steps: sequentially adding piperazine, sodium p-formaldehyde benzenesulfonate, sodium cyanoborohydride, methanol and 30wt% hydrochloric acid into a first reactor, heating while stirring, carrying out reflux reaction, and adding a 1M sodium hydroxide solution to adjust the pH value to 3-5; adding chloroform into the mixed solution, extracting, and evaporating to dryness by a rotary evaporator to obtain an intermediate product; transferring the intermediate product to a second reactor by using ethanol, adding bromoalkane, heating and refluxing, and evaporating to dryness by using a rotary evaporator to obtain a crude product; and adding n-hexane into the crude product, heating for dissolving, filtering, cooling filtrate to below 10 DEG C, separating out crystals, filtering, and drying at 80-100 DEG C for 2-3 hours to obtain the cleanup additive. The invention has the advantages of simple synthesis, no pollution, low surface tension and low critical micelle concentration.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and relates to a surfactant and a preparation method thereof, in particular to a drainage aid for acid fracturing and a preparation method thereof. Background technique [0002] With the continuous development of my country's economy and the rapid development of the oil extraction industry, in order to achieve a very high level of extraction effect, great attention has been paid to acid fracturing technology. For acid fracturing technology, in practical application, it is mainly responsible for the important role of providing oil storage space and seepage channels. In order to meet the requirements of extremely high-efficiency extraction, it is naturally necessary to maintain the smoothness of the oil storage space, which is an important guarantee for the significant increase in the number of oil extraction. [0003] After the acid fracturing is stopped, corresponding joints will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D295/096C09K8/68C09K8/74
CPCC07D295/096C09K8/68C09K8/74
Inventor 刘达吴晓玲
Owner SHOUGUANG XINHAI ENERGY TECH CO LTD
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