Preparation method for high-temperature crosslinking agent for oil field tertiary oil recovery

A cross-linking agent and high-temperature technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the development and application of low-cost profile control and flooding systems in the middle and deep layers, health and environmental hazards of construction personnel, and system High toxicity and other problems, to achieve the effect of excellent thermal stability, low price and low cost

Inactive Publication Date: 2012-08-29
唐山冀油瑞丰化工有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The various cross-linking agents disclosed above and the high-temperature cross-linking agents used at this stage can react with polyacrylamide, and the gel formed can adapt to high formation temperature and has high gel forming strength, but the formed colloid is jelly, which has poor fluidity and spreads The area is small, so it can only be used for profile control and plugging, and the system is highly toxic, which will cause certain harm to the health of construction workers and the environment, and the cost of chemicals is high
After retrieving domestic and foreign literature, there is no literature report on the development and application of the medium-deep low-cost profile control and flooding system with the same comprehensive technical characteristics as the present invention

Method used

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  • Preparation method for high-temperature crosslinking agent for oil field tertiary oil recovery
  • Preparation method for high-temperature crosslinking agent for oil field tertiary oil recovery
  • Preparation method for high-temperature crosslinking agent for oil field tertiary oil recovery

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preparation example Construction

[0028] The preparation method of the high-temperature cross-linking agent for oilfield tertiary oil recovery is as follows: the high-temperature cross-linking agent is compounded from cross-linking agent A and cross-linking agent B.

[0029] The preparation method of crosslinking agent A: acetone: formaldehyde: organic amine = 1:2-4:2-3.5 (molar ratio), at a reaction temperature of 50-120 ° C, a reaction pressure of 0-0.3 MPa, stirring reaction 5- 8h, must contain two active groups (hydroxymethylene-CH 2 OH) crosslinking agent A, its reaction principle is:

[0030]

[0031] where R is C 1 —C 18 Straight chain alkyl; n is an integer of 1-20.

[0032] The preparation method of crosslinking agent B is melamine: formaldehyde: ketone = 1:3—10:3-10 (molar ratio), at the reaction temperature of 75-95°C, the reaction pressure is 0-0.3MPa, and the reaction is stirred for 3-5h , to obtain three reactive groups (hydroxymethylene-CH 2 OH) cross-linking agent B, its reaction princi...

Embodiment 1

[0038]Synthesis of crosslinking agent A-1: ​​500ml four-neck flask equipped with thermometer, dropping funnel, reflux condenser and magnetic stirrer. Add 80g of distilled water into the four-neck flask, start stirring, dropwise add 110g of ethylamine aqueous solution (percentage concentration 70%), control the temperature at 40-50°C, after the dropwise addition, add 45g of acetone, raise the temperature to 75-80°C, drop 150g formaldehyde aqueous solution (percentage concentration 37%) is added dropwise within 1-1.5 hours. Then raise the temperature to 85-95°C and react for 6 hours to obtain crosslinking agent A (code A-1).

[0039] Synthesis of crosslinking agent B-1: 500ml four-neck flask equipped with thermometer, dropping funnel, reflux condenser and magnetic stirrer. Add 50g of distilled water and 50g of ethanol to a four-necked flask, add 35g of melamine and 78g of acetone, raise the temperature to 75-80°C, add 105g of formaldehyde solution (percentage concentration: 37%...

Embodiment 2

[0044] Synthesis of crosslinking agent A-2: 500ml four-necked flask equipped with thermometer, dropping funnel, reflux condenser and magnetic stirrer. Add 100g of distilled water into the four-necked flask, start stirring, dropwise add 78g of n-butylamine, control the temperature at 40-50°C, add 26g of acetone after the drop, raise the temperature to 75-80°C, add dropwise 110g of formaldehyde solution (percent concentration 37% ), the dropwise addition was completed in 1h. Then raise the temperature to 85-95°C and react for 6 hours to obtain crosslinking agent A (code A-2).

[0045] Synthesis of crosslinking agent B-2: 500ml four-neck flask equipped with thermometer, dropping funnel, reflux condenser and magnetic stirrer. Add 70g of distilled water and 80g of ethanol to a four-necked flask, add 20g of melamine and 127g of propiophenone, raise the temperature to 80-85°C, add 78g of formaldehyde solution (percentage concentration: 37%) dropwise, complete the dropwise addition i...

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Abstract

The invention relates to a preparation method for a high-temperature crosslinking agent for oil field tertiary oil recovery. The high-temperature crosslinking agent is prepared by compounding a double active group (hydroxyl methylene-CH2OH) crosslinking agent A and a crosslinking agent B according to the requirements on displacement control and profile control in different ratios, wherein the crosslinking agent B is synthesized by melamine, formaldehyde and ketone; the mass ratio of the crosslinking agent A to the crosslinking agent B of the crosslinking agent for displacement control is 5:1 to 1:1; the mass ratio of the crosslinking agent A to the crosslinking agent B of the crosslinking agent for profile control is 1:2 to 1:5; and the mass ratio of the crosslinking agent A to the crosslinking agent B of the crosslinking agent for displacement control and profile control is 1:1 to 1:3. The preparation method is scientific, is low in preparation cost and toxicity and contributes to construction and operation. Particularly, when the high-temperature crosslinking agent is applied to deep profile control, displacement control, profile control and displacement control construction in the stratum at the temperature of between 70 and 120 DEG C in the oil field tertiary oil recovery, about 26 million yuan can be created every year and the profit is 3 million yuan.

Description

technical field [0001] The invention relates to a chemical agent for petroleum and oil fields, in particular to a preparation method of a high-temperature crosslinking agent for oil field tertiary oil recovery. Background technique [0002] In oilfield tertiary oil recovery, the cross-linking agent reacts with polyacrylamide to form gels with different shapes, which are used in oilfield profile control, flood control and water shutoff technology to enhance oil recovery. Currently commonly used polyacrylamide crosslinking agents mainly include high-valent metal ions (such as chromium, aluminum, titanium, zirconium) and organic synthesis (such as water-soluble phenolic resin). High-valent metal ions are used in low temperature (≤65°C) and acidic oil reservoirs. For the deep profile control and flooding technology of medium and high temperature reservoirs, the main water-soluble phenolic resin crosslinking agent. Chen Quansheng and others applied for CN101381440A "A Preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08G12/00
Inventor 乔孟占吴炜陈永生李建董彦龙
Owner 唐山冀油瑞丰化工有限公司
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