A temperature-resistant and salt-resistant jelly foam containing phosphonic acid structure and its preparation method and application

A temperature-resistant, salt-resistant, and jelly-resistant technology, which is applied in the direction of chemical instruments and methods, and drilling compositions, can solve the problems of easy dehydration and degradation, and cannot achieve selective water blocking, and achieve enhanced cross-linking density. , good water plugging selectivity, and the effect of enhancing salt resistance

Active Publication Date: 2022-02-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] From the current point of view, gel foam is basically suitable for low-temperature and low-salinity reservoirs. Dehydration and degradation are easy to occur under certain conditions, and the purpose of selective water shutoff cannot be achieved

Method used

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  • A temperature-resistant and salt-resistant jelly foam containing phosphonic acid structure and its preparation method and application
  • A temperature-resistant and salt-resistant jelly foam containing phosphonic acid structure and its preparation method and application
  • A temperature-resistant and salt-resistant jelly foam containing phosphonic acid structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for preparing a temperature-resistant and salt-resistant carbon dioxide gel foam for oil field water plugging, comprising the following steps:

[0057] 1) Weigh 5.0g of N,N-dimethylacrylamide, 36.85g of isooctyl acrylate (salt-tolerant monomer), 10.4g of 2-acrylamide-2-methylpropanesulfonic acid monomer, 5.56 g of N-vinylpyrrolidone and 200 mL of acetone solvent were transferred to a four-necked flask placed in a constant temperature water bath, and then nitrogen gas was passed into the four-necked flask for 10 minutes to remove oxygen, and then heated under magnetic stirring at a heating temperature of 50°C .

[0058] When the temperature was raised to 70°C reaction temperature, 0.36g of benzoyl peroxide (BPO) initiator was added. After the initiator was dissolved in 20mL of acetone solution, it was slowly added dropwise through a constant pressure dropping funnel, and the reaction was continued at this temperature for 6h , To obtain a temperature-resistant a...

Embodiment 2

[0063] As shown in Example 1, the difference is that each component mass percent in step 2) becomes the following ratio:

[0064] 0.6% heat-resistant and salt-resistant polymer, 0.5% resorcinol, 0.5% hexamethylenetetramine, 0.5% octylphenol ethoxylate, 0.5% phenylphosphonic acid, 0.4% Sulfite. The balance is water.

Embodiment 3

[0066] As shown in Example 1, the difference is that the phenols in step 2) are changed to pyrocatechol.

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Abstract

The invention relates to a heat-resistant and salt-resistant jelly foam containing a phosphonic acid structure, a preparation method and application thereof. The temperature-resistant and salt-resistant jelly foam is prepared by passing carbon dioxide gas into the liquid gel; the mass percentage components of the liquid phase gel are: 0.3% to 0.9% of temperature-resistant and salt-resistant polymer, phenol or benzene 0.2% to 0.9% of phenol, 0.2% to 0.9% of aldehyde compound, 0.2% to 0.8% of foaming agent, 0.3% to 0.6% of organic matter containing phosphonic acid structure, 0.3% to 0.7% of auxiliary agent, and the balance is water; It is used for selective water shutoff in high temperature and high salinity formation conditions.

Description

technical field [0001] The invention relates to a heat-resistant and salt-resistant jelly foam containing a phosphonic acid structure and a preparation method and application thereof, which belong to the technical field of oil field chemistry and are particularly suitable for selective water shutoff of high-temperature and high-salt oil reservoirs. Background technique [0002] my country's high-temperature and high-salinity oil and gas fields are widely distributed, rich in resources, and have great mining value, but at the same time, they are also difficult to develop. The reason is that its high-temperature and high-salinity formation characteristics limit the application of many production stimulation measures. [0003] In terms of selective water shutoff measures, partially hydrolyzed polyacrylamide (HPAM) is the most important polymer main agent in water shutoff agents. However, due to the high temperature and high salinity environment, the carboxyl groups of HPAM are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/518C09K8/70C08F220/18C08F220/54C08F220/58C08F226/10
CPCC09K8/518C09K8/703C08F220/18
Inventor 王彦玲兰金城蒋保洋孟令韬许宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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