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Water-soluble oil washing agent as well as preparation method and application thereof

A water-soluble, oil-washing agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high crude oil viscosity, poor fluidity, and low recovery rate, and reduce the viscosity of crude oil and improve oil washing. The effect of efficiency

Pending Publication Date: 2022-03-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for heavy oil reservoirs and reservoirs with high content of heavy components in formation crude oil, due to the high viscosity, high density and poor fluidity of crude oil, the water flooding recovery rate is low.
For most heavy oil reservoirs, the viscosity of formation crude oil exceeds 100mPa.s, and the application of polymer flooding and composite flooding technology is also greatly restricted
[0003]In recent years, the enhancement of heavy oil recovery by emulsified viscosity reducer flooding has received extensive attention. , which has the problems of high oil-water ratio, easy fingering and low recovery
Small molecule viscosity reducers are used in a large amount and cost high, which limits their application scale in heavy oil water flooding
In addition, the stability of the emulsion formed by the small molecule emulsifier is poor, and it is easy to reverse the phase and become a W / O emulsion with high viscosity, which will increase the viscosity of crude oil instead.

Method used

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  • Water-soluble oil washing agent as well as preparation method and application thereof
  • Water-soluble oil washing agent as well as preparation method and application thereof
  • Water-soluble oil washing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Acrylic polymer A1 containing polyether structure was prepared according to the method of patent CN201811211066.X.

[0081] The preparation process of polymer A1 is as follows:

[0082] Step 1, take 10 grams of polyoxyethylene polyoxypropylene ether (number average molecular weight ≥ 2000, hydroxyl value 45mg KOH / g) with allyl alcohol as initiator, 10 grams of hydrophobic monomer (6 grams of butyl acrylate and 4 grams of methyl methacrylate) and 36 grams of cyclohexanone were added to the reactor, fully stirred until completely dissolved.

[0083] Step 2, replace the air in the reactor with nitrogen and continuously feed nitrogen, heat up to 80°C, add 0.05 g of benzoyl peroxide to start the reaction, and react at 80°C for 3.5 hours.

[0084] Step 3: Weigh 0.6 g of hydrophilic monomer acrylic acid, 0.02 g of benzoyl peroxide and 10 g of cyclohexanone, mix them uniformly, add them into the reactor, and continue to react at 80° C. for 4 hours.

[0085] Step 4, after cool...

Embodiment 2

[0087] Acrylic polymer A2 containing polyether structure was prepared according to the method of patent 201910516007.1.

[0088] The preparation process of polymer A2 is as follows:

[0089] Step 1, weigh 8 grams of polyoxyethylene polyoxypropylene ether (number-average molecular weight ≥ 2000, hydroxyl value 45 mg KOH / g) containing double bonds in the end group, 6.4 grams of butyl acrylate, 1.6 grams of 2-ethylhexyl acrylate The ester and 42 grams of toluene were added to the reactor and stirred thoroughly until completely dissolved.

[0090] Step 2, replace the air in the reactor with nitrogen and continuously feed nitrogen, heat up to 80° C., and add 0.096 g of benzoyl peroxide to start the reaction. The reaction was carried out at 80° C. for 1 hour.

[0091] Step 3, weigh 6 grams of polyoxyethylene polyoxypropylene ether with double bonds in the end group, 3.2 grams of butyl acrylate, 0.8 grams of 2-ethylhexyl acrylate, 0.3 grams of hydrophilic monomer acrylic acid, 0.06...

Embodiment 3

[0095] Preparation of modified lignin:

[0096] Step 1: Weigh 2 grams of enzymatic lignin, add 50 grams of deionized water into a three-necked flask, adjust the pH value of the solution to above 11 with 20 wt% aqueous sodium hydroxide solution, and stir until the enzymatic lignin is completely dissolved.

[0097] Step 2, under nitrogen protection, the temperature was raised to 80° C., and under constant stirring, 4 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride was added dropwise to the three-necked flask, and the dropwise addition was completed in 30 minutes.

[0098] Step 3, under nitrogen protection, the reaction was continued for 4 hours at 80° C. under constant stirring.

[0099] Step 4, lower the temperature, precipitate with 1M dilute hydrochloric acid, filter, wash until the filtrate is neutral, collect the solid and vacuum-dry it to constant weight. The obtained modified lignin is brownish yellow powder.

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Abstract

The invention discloses a water-soluble oil washing agent for thickened oil as well as a preparation method and application of the water-soluble oil washing agent. The water-soluble oil washing agent comprises an acrylate copolymer with a polyether structure, modified lignin and water. The acrylate copolymer with the polyether structure is formed by free radical polymerization of a polyoxyethylene polyoxypropylene ether monomer with a double bond at a terminal group, a hydrophobic monomer and an optional hydrophilic monomer. The modified lignin is cationized enzymatic hydrolysis lignin. The oil washing agent disclosed by the invention is used for washing heavy oil, and can effectively reduce the viscosity of crude oil and improve the oil washing efficiency.

Description

technical field [0001] The invention relates to the field of cleansing agents, in particular to a water-soluble cleansing agent for heavy oil and its preparation method and application. Background technique [0002] my country is rich in heavy oil resources. With the continuous demand for energy in economic development, heavy oil will become one of the main battlefields for future oil exploitation in my country. However, for heavy oil reservoirs and reservoirs with high content of heavy components in formation crude oil, due to the high viscosity, high density and poor fluidity of crude oil, the water flooding recovery rate is low. For most heavy oil reservoirs, the viscosity of formation crude oil is more than 100mPa.s, and the application of polymer flooding and composite flooding technology is also greatly restricted. [0003] In recent years, the enhancement of heavy oil recovery by emulsified viscosity reducer flooding has been widely valued. At present, heavy oil visc...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08H7/00
CPCC09K8/584C08H6/00
Inventor 侯丹丹张天宇许春梅徐伟张增丽
Owner CHINA PETROLEUM & CHEM CORP
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