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Enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs

A jelly dispersion, high-temperature and high-salt technology, which is applied in drilling compositions, chemical instruments and methods, etc., to achieve good deep migration capability, enhanced oil recovery, increased strength, and temperature and salt tolerance. Effect

Active Publication Date: 2018-12-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides an enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt oil reservoirs, so as to solve the problem of deep control and displacement in low-permeability, high-temperature and high-salt oil reservoirs, and improve recovery

Method used

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  • Enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs
  • Enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs
  • Enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs

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Experimental program
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Effect test

Embodiment 1

[0038] The enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs consists of: functional polymer 0.5%, hexamethylenetetramine 0.3%, hydroquinone 0.3%, hydrophilic nano Silicon dioxide 0.2% and water 98.7%; the quality of each component is:

[0039] Functional polymer 2.0g;

[0040] Hexamethylenetetramine 1.2g, hydroquinone 1.2g;

[0041] Hydrophilic nano silicon dioxide 0.8g;

[0042] Water 394.8g.

[0043] Its preparation method is as follows:

[0044] (1) Take 394.8g of water, slowly add 0.8g of hydrophilic nano-silica to the water while stirring, and continue ultrasonic stirring for 2 hours to obtain a uniform dispersion;

[0045] (2), then slowly add 2.0g of functional polymer, 1.2g of hexamethylenetetramine and 1.2g of hydroquinone while stirring, and keep stirring for 2 to 3 hours to obtain the body jelly-forming gel;

[0046] (3) After sealing the jelly into a gel solution, place it in...

Embodiment 2

[0050] The enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs consists of: functional polymer 0.5%, hexamethylenetetramine 0.3%, hydroquinone 0.3%, hydrophilic nano Silicon dioxide 0.2% and water 98.7%, each component mass is:

[0051] Functional polymer 2.0g;

[0052] Hexamethylenetetramine 1.2g, hydroquinone 1.2g;

[0053]Hydrophilic nano silicon dioxide 0.8g;

[0054] Water 394.8g.

[0055] Its preparation method is as follows:

[0056] (1) Take 394.8g of water, slowly add 0.8g of hydrophilic nano-silica to the water while stirring, and continue ultrasonic stirring for 2 hours to obtain a uniform dispersion;

[0057] (2), then slowly add 2.0g of functional polymer, 1.2g of hexamethylenetetramine and 1.2g of hydroquinone while stirring, and keep stirring for 2 to 3 hours to obtain the body jelly-forming gel;

[0058] (3) After sealing the jelly into a gel, place it in an oven at 130°C fo...

Embodiment 3

[0062] The enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs consists of: functional polymer 0.5%, hexamethylenetetramine 0.3%, hydroquinone 0.3%, hydrophilic nano Silicon dioxide 0.2% and water 98.7%, each component mass is:

[0063] Functional polymer 2.0g;

[0064] Hexamethylenetetramine 1.2g, hydroquinone 1.2g;

[0065] Hydrophilic nano silicon dioxide 0.8g;

[0066] Water 394.8g.

[0067] The preparation method is as follows:

[0068] (1) Take 394.8g of water, slowly add 0.8g of hydrophilic nano-silica to the water while stirring, and continue ultrasonic stirring for 2 hours to obtain a uniform dispersion;

[0069] (2), then slowly add 2.0g of functional polymer, 1.2g of hexamethylenetetramine and 1.2g of hydroquinone while stirring, and keep stirring for 2 to 3 hours to obtain the body jelly-forming gel;

[0070] (3) After sealing the jelly into a gel solution, place it in an oven a...

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Abstract

The invention belongs to the field of oilfield chemistry, and in particular relates to an enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt oil reservoirs. The enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs is composed of functional polymers, cross-linking agents, inorganic reinforcing agents, and water in the following mass fractions: functional polymers, with a mass concentration of 0.4 to 0.6 %; cross-linking agent mass concentration 0.4-0.8%; inorganic reinforcing agent, mass concentration 0.2-0.3%; the balance is water. The average particle size of the enhanced jelly dispersion deep control and displacement agent of the present invention is distributed from nanometer to micron level, can be used for deep control and displacement of low permeability reservoirs, has good deep migration ability, good profile improvement effect, and enhanced recovery factor The effect is remarkable; the deep control and displacement agent can be used for deep control and displacement operations in high-temperature and high-salt oil reservoirs. Effectively improve the formation profile, significantly increase the follow-up water flooding sweep coefficient, and further increase the recovery factor.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to an enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt oil reservoirs. technical background [0002] Low-permeability reservoirs are of great significance in the development of reservoirs in my country. Among the proven reserves, low-permeability reservoirs account for about 2 / 3 of all reserves, and the development potential is huge. During the development of low-permeability reservoirs, problems such as the decline of crude oil production and the rise of comprehensive water cut generally occur. Therefore, it is of great significance to carry out deep control and flooding in low-permeability reservoirs and further enhance the recovery factor. [0003] In conventional oil reservoirs, the most widely used deep control and displacement agent is weak polymer jelly. For example, CN104342099A provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/588
CPCC09K8/512C09K8/588C09K8/882
Inventor 戴彩丽刘逸飞吴一宁何龙甄建伟邹辰炜由庆赵光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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