Reinforced gel dispersion deep profile control and flooding agent for low-permeability high-temperature high-salt oil reservoirs

A jelly dispersion, high-temperature and high-salt technology, applied in drilling compositions, chemical instruments and methods, etc., to achieve the effect of good effect, good profile improvement and strong skeleton

Active Publication Date: 2016-10-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-tem

Method used

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  • Reinforced gel dispersion deep profile control and flooding agent for low-permeability high-temperature high-salt oil reservoirs
  • Reinforced gel dispersion deep profile control and flooding agent for low-permeability high-temperature high-salt oil reservoirs
  • Reinforced gel dispersion deep profile control and flooding agent for low-permeability high-temperature high-salt oil reservoirs

Examples

Experimental program
Comparison scheme
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 particularly relates to a reinforced gel dispersion deep profile control and flooding agent for low-permeability high-temperature high-salt oil reservoirs. The reinforced gel dispersion deep profile control and flooding agent for low-permeability high-temperature high-salt oil reservoirs is composed of the following components in percentage by mass: 0.4-0.6% of functional polymer, 0.4-0.8% of crosslinking agent, 0.2-0.3% of inorganic reinforcer and the balance of water. The average particle size distribution of the reinforced gel dispersion deep profile control and flooding agent is nano or micron size; and the reinforced gel dispersion deep profile control and flooding agent can be used for deep profile control and flooding for low-permeability oil reservoirs, and has favorable deep migration capacity, favorable profile improvement effect and obvious recovery efficiency enhancement effect. The deep profile control and flooding agent can be used for deep profile control and flooding operation of high-temperature high-salt oil reservoirs. The reinforced gel dispersion deep profile control and flooding agent effectively improves the stratigraphic profile, obviously enhances the subsequent water flooding sweep efficiency and further enhances the recovery efficiency.

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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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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