A kind of strong hydrophilic wetting agent for rock surface based on high temperature excitation and preparation method thereof

A technology of water wetting and rock, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as low, even if a part is adsorbed on the rock surface, and the water wettability of the rock surface disappears

Active Publication Date: 2021-08-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature at the bottom of oil and gas wells is high and contains crude oil, which causes a large amount of surfactants to accumulate at the oil-water interface, and the coverage efficiency on the rock surface is low. Even if some of them are adsorbed on the rock surface, it is due to the high temperature environment and the dissolution balance. Gradually shifts into the liquid phase, making the water wettability of the rock surface gradually disappear

Method used

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  • A kind of strong hydrophilic wetting agent for rock surface based on high temperature excitation and preparation method thereof
  • A kind of strong hydrophilic wetting agent for rock surface based on high temperature excitation and preparation method thereof
  • A kind of strong hydrophilic wetting agent for rock surface based on high temperature excitation and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The strong hydrophilic wetting agent on the rock surface based on high temperature excitation has a structural formula of

[0033]

[0034] Wherein, a is 20-100 times of b, m=5-100, n=200-300.

[0035] The preparation method of the rock surface strong hydrophilic wetting agent based on high-temperature excitation is specifically as follows: first, 98g (1mol) maleic anhydride, 10.47g initiator azobisisobutyronitrile (AIBN) and 98g dimethyl formaldehyde Amide (DMF) was added to the flask, heated to 70°C with constant stirring, and then 3g (0.01mol) of low molecular weight allyl polyether with a molecular weight of 300 was added; A mixed solution composed of acyloxypropyltrimethoxysilane and 248g DMF was incubated at 75°C for 5 hours, and the solvent DMF was distilled off under reduced pressure to obtain a yellow solid, which was pulverized to obtain a strongly hydrophilic rock surface based on high temperature excitation. D.

Embodiment 2

[0037] The preparation method of the rock surface strong hydrophilic wetting agent based on high-temperature excitation is specifically as follows: first, 98g (1mol) maleic anhydride, 10.65g initiator azobisisobutyronitrile (AIBN) and 98g dimethyl formaldehyde Amide (DMF) was added to the flask, heated to 70°C with constant stirring, and then 6g (0.02mol) of low molecular weight allyl polyether with a molecular weight of 300 was added; A mixed solution composed of acyloxypropyltrimethoxysilane and 248g DMF was incubated at 75°C for 5 hours, and the solvent DMF was distilled off under reduced pressure to obtain a yellow solid, which was pulverized to obtain a strongly hydrophilic rock surface based on high temperature excitation. D.

Embodiment 3

[0039] The preparation method of the rock surface strong hydrophilic wetting agent based on high-temperature excitation is specifically as follows: first, 98g (1mol) maleic anhydride, 10.65g initiator azobisisobutyronitrile (AIBN) and 98g dimethyl formaldehyde Amide (DMF) was added to the flask, heated to 70°C with constant stirring, and then 9g (0.03mol) of low molecular weight allyl polyether with a molecular weight of 300 was added; A mixed solution composed of acyloxypropyltrimethoxysilane and 248g DMF was incubated at 75°C for 5 hours, and the solvent DMF was distilled off under reduced pressure to obtain a yellow solid, which was pulverized to obtain a strongly hydrophilic rock surface based on high temperature excitation. D.

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Abstract

The invention belongs to the technical field of oil field development, and in particular relates to a high-temperature excitation-based strongly hydrophilic wetting agent for rock surfaces and a preparation method thereof. The wetting agent is prepared by addition polymerization of maleic anhydride, γ-methacryloxypropyltrimethoxysilane and low molecular weight allyl polyether in a dimethylformamide system. The strong hydrophilic wetting agent on the rock surface is aimed at high-temperature oil and gas wells. The wetting agent can change the wettability of the rock in the well, reduce the surface energy of the rock, and reduce the adsorption of the rock to the polymer; it can also make the crude oil It is of great significance to maintain the increase in production of oil fields without being adsorbed on rocks in the passage.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a high-temperature excitation-based strongly hydrophilic wetting agent for rock surfaces and a preparation method thereof. Background technique [0002] During oilfield development, the reservoir interface includes three interfaces: displacement fluid-crude oil, displacement fluid-rock and crude oil-rock, and the properties of the reservoir interface have a great influence on the recovery factor of the reservoir. At present, it is generally believed that changing the wettability of the reservoir can also significantly increase the recovery of the reservoir. Wettability is a basic parameter of reservoir physical properties, which has a great influence on oil recovery, so how to effectively change the wettability of reservoirs to enhance oil recovery becomes very important. [0003] The water-wet reservoir has the highest water flooding recovery, so the k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F230/08C08F222/06C08F216/14C09K8/584
CPCC08F222/06C08F230/08C09K8/584
Inventor 李强王业飞丁名臣杨震赵敏钱程赵宁曲天正
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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