Depressurization enhancement agent for water injection well and preparing method thereof

A technology of injection booster and carboxylic acid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult water injection, high injection pressure, and high energy consumption of the injection system, and achieve high injection pressure and preparation method Simple and reasonable effect

Active Publication Date: 2016-07-27
大庆市富杰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at overcoming the deficiencies of the prior art, and provides a pressure-reducing and increasing injection agent for water injection wells and a preparation method thereof, which are used to solve the problem of high injection pressure, difficulty in water injection, and problems in the injection system of water injection wells in the middle and later stages of oilfield development and low-permeability reservoirs. Technical issues with high energy consumption

Method used

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  • Depressurization enhancement agent for water injection well and preparing method thereof
  • Depressurization enhancement agent for water injection well and preparing method thereof
  • Depressurization enhancement agent for water injection well and preparing method thereof

Examples

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Effect test

Embodiment 1

[0024] Add 545 kilograms of water, 100 kilograms of ethylene glycol monomethyl ether, 200 kilograms of octadecyl trimethylammonium chloride and 35 kilograms of polyoxyethylene in 1000 liters of stainless steel reaction kettles, start stirring, and reaction kettle is heated up to 50°C, stirred and reacted for 2 hours. After the solution is homogeneous, continue to add 100 kg of trimethylamine hydrochloride, 10 kg of polydimethyldiallyl ammonium chloride and 10 kg of trisodium nitrilotriacetate into the reaction kettle, and continue to stir and react for 1 hour to obtain Depressurization and injection booster products for water injection wells.

Embodiment 2

[0026] Add 555 kilograms of water, 100 kilograms of ethylene glycol monomethyl ether, 200 kilograms of octadecyl trimethylammonium chloride and 35 kilograms of polyoxyethylene in 1000 liters of stainless steel reaction kettles, start stirring, and reaction kettle is heated up to 60°C, stirred and reacted for 2 hours. After the solution is homogenized, continue to add 50 kg of trimethylamine hydrochloride, 50 kg of polydimethyldiallyl ammonium chloride and 10 kg of trisodium nitrilotriacetate into the reaction kettle, and continue to stir and react for 1.5 hours to obtain Depressurization and injection booster products for water injection wells.

Embodiment 3

[0028]Add 555 kg of water, 75 kg of ethylene glycol monomethyl ether, 100 kg of stearyl trimethyl ammonium chloride, and 100 kg of cetyl trimethyl ammonium propionate in a 1000-liter stainless steel reactor. kg and 35 kg of polyethylene oxide, start stirring, and the reaction kettle is heated to 45° C., and the reaction is stirred for 3 hours. After the solution is homogeneous, continue to add 50 kg of trimethylamine hydrochloride, 50 kg of ammonium chloride, 20 kg of polydimethyldiallyl ammonium chloride and 15 kg of trisodium nitrilotriacetate into the reactor, and continue to stir After 2 hours of reaction, the pressure-reducing and injection-increasing agent product for water injection wells was obtained.

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Abstract

The invention discloses a depressurization enhancement agent for a water injection well and a preparing method thereof and belongs to oilfield chemistry agents.The depressurization enhancement agent is prepared from 15-25% of carboxylic acid high carbon alcohol ester-based trimethyl ammonium chloride, 1-10% of trimethylamine hydrochloride, 1-10% of poly diallyldimethylammonium chloride, 1-5% of polyoxyethylene, 1-2% of nitrilotriacetic acid trisodium salt, 5-10% of ethylene glycol monomethyl ether and water.According to the preparing method, water, carboxylic acid high carbon alcohol ester-based trimethyl ammonium chloride, ethylene glycol monomethyl ether and polyoxyethylene are evenly mixedly and heated to 45-60 DEG C, and stirring is conducted; then trimethylamine hydrochloride, poly diallyldimethylammonium chloride and nitrilotriacetic acid trisodium salt are added to the substance obtained in the last step, and stirring is conducted continuously to obtain the depressurization enhancement agent for the water injection well.When the adding amount is 0.5%(m / m), injection pressure can be reduced by 28% or more, injection rate can be increased by 40% or more, and the problems that injection pressure is high, injection is difficult, and the energy consumption of an injection system is high in the middle and later period of oilfield development for a low-permeability reservoir water injection well can be effectively solved.

Description

technical field [0001] The invention belongs to chemical agents for oilfields, and in particular relates to a pressure-reducing and injection-increasing agent for water injection wells and a preparation method thereof. Background technique [0002] Daqing Oilfield has entered the mid-to-late stage of production. Ensuring crude oil production and reducing development costs have always been the focus of Daqing Oilfield. With the popularization of technical measures such as polymer flooding and ASP flooding, although some production has been stabilized and increased to a certain extent, due to factors such as high production costs and difficulty in gathering and transportation, the above measures have always been Failed to fully promote. Conventional water flooding and fine water flooding are still the main means of stabilizing crude oil production in Daqing Oilfield. However, after long-term development in Daqing Oilfield, almost all of the main oil layers have been developed...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584C09K8/588
CPCC09K8/58C09K8/584C09K8/588C09K2208/12C09K2208/34
Inventor 代国臣孙玉波孙豫庆祝显江李英董翠婷卢炳霖代珺良
Owner 大庆市富杰化工有限公司
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