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Surfactant for improving water injection efficiency in low-permeability reservoirs, preparation method and application

A surfactant and low-permeability technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of single chemical system performance, ineffectiveness, poor imbibition, etc. Achieve good biodegradability, reduce consumption, avoid liquid crystallization and precipitation

Active Publication Date: 2022-04-05
SHANDONG DESHI CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to many factors affecting the development effect of water flooding, and the performance of the currently used chemical system is relatively single, and the use concentration is high, the cost is high, and the imbibition is not good, often cannot achieve satisfactory results.

Method used

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  • Surfactant for improving water injection efficiency in low-permeability reservoirs, preparation method and application
  • Surfactant for improving water injection efficiency in low-permeability reservoirs, preparation method and application
  • Surfactant for improving water injection efficiency in low-permeability reservoirs, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 Surfactant 1#

[0043] (1) Using 26.4g of dimethyl malonate and 46.4g of N,N-dimethyl-1,4-butanediamine as raw materials, add 1.5g of sodium formate and react at 100°C for 24 hours. After the reaction is complete, add dropwise 2.5ml of acetic acid was stirred for 1 hour, cooled to obtain a light yellow solid, and dried in an oven at 105°C to obtain the crude product of bis(4-dimethylaminobutyl)malonamide; weigh 29.6g of bis(4-dimethylaminobutyl) ) crude malonamide reacted with 50.0 g of dodecane bromide at 50°C to obtain a mixture of quaternary ammonium salt type gemini surfactants containing amido groups, which was recrystallized from acetone to obtain cationic surfactant 1#.

[0044] (2) Add 40.0g of water to the reaction kettle, add 5.0g of polymer surfactant while stirring at 30-40°C, and stir for 2 hours; then add 2.0g of nonionic surfactant and 38.0g of cationic surfactant 1 #, after stirring for 1h, add 10.0g ethanol, continue to stir for 1h, after ...

Embodiment 2

[0049] Embodiment 2 Surfactant 2#

[0050] The difference between Example 2 and Example 1 is that in step (2), 40.0 g of water was added to the reaction kettle, 5.0 g of polymer surfactant was added while stirring at 30-40 °C, and stirred for 2 hours; then 5.0 g of water was added. g nonionic surfactant and 35.0g cationic surfactant 1#, after stirring for 1h, add 10.0g ethanol, continue stirring for 1h, after mixing uniformly, obtain surfactant 2#; all the other conditions are the same as in Example 1.

Embodiment 3

[0051] Embodiment 3 Surfactant 3#

[0052] The difference between Example 3 and Example 1 is: in step (2), 40.0 g of water was added to the reaction kettle, 2.0 g of polymer surfactant was added while stirring at 30-40 ° C, and stirred for 2 hours; then 5.0 g of water was added. g nonionic surfactant and 38.0g cationic surfactant 1#, after stirring for 1h, add 10.0g ethanol, continue stirring for 1h, after mixing uniformly, obtain surfactant 3#; all the other conditions are the same as in Example 1.

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Abstract

The application discloses a surfactant for improving the water injection efficiency of low-permeability oil reservoirs, its preparation method and application, and belongs to the technical field of surfactants used in oil and gas field development. The surfactant, in parts by weight, comprises: 1-5 parts of a nonionic surfactant, and 25-50 parts of a cationic surfactant. The surfactant can effectively reduce the water injection pressure of water injection wells, avoid the increase of water injection pressure caused by a large amount of emulsification of crude oil, improve the water injection capacity of well injection wells, change the wettability of rocks, reduce capillary pressure, and inhibit the precipitation of carbonates such as calcium carbonate. Formation damage; at the same time, it can effectively reduce the oil-water interfacial tension, has excellent surface properties, and is conducive to the improvement of oil recovery.

Description

technical field [0001] The application relates to a surfactant for improving the water injection efficiency of low-permeability reservoirs, a preparation method and application thereof, and belongs to the technical field of surfactants used in oil and gas field development. Background technique [0002] Low-permeability reservoirs refer to reservoirs with low permeability, low abundance and low single-well productivity. Among the proven reserves of oil reservoirs, the proportion of low-permeability reservoirs is very high, accounting for more than 2 / 3 of the national reserves, reaching more than 5 billion tons. Therefore, low-permeability reservoirs are of great significance in my country's oil development. The development potential is huge. Compared with medium-high permeability reservoirs, low-permeability reservoirs have the characteristics of low permeability, small porosity, various types and high content of clay minerals, tight lithology and poor injection water qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/524C09K8/528E21B43/20E21B43/22
CPCC09K8/584C09K8/528C09K8/524C09K8/604E21B43/20E21B43/16
Inventor 崔仕章宋新旺肖盼郭鑫马丽杨金兴黄琦活房吉涛栾翔童鲁浩
Owner SHANDONG DESHI CHEM IND CO LTD
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