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A kind of modified phenolic crosslinking agent and its preparation method and application

A phenolic cross-linking agent and modification technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low reactivity and short shelf life, achieve stable gel system, improve reactivity, prolong Save the effect of expiration date

Active Publication Date: 2020-04-21
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a modified phenolic resin crosslinking agent and its preparation method and application, which solves the technical problems of low reactivity and short shelf life of the water-soluble phenolic resin crosslinking agent in the prior art

Method used

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  • A kind of modified phenolic crosslinking agent and its preparation method and application
  • A kind of modified phenolic crosslinking agent and its preparation method and application

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preparation example Construction

[0042] On the other hand, based on the same inventive concept, the embodiment of the present invention provides a preparation method of the above-mentioned modified phenolic crosslinking agent, please refer to figure 1 ,include:

[0043] Step S110: heating the phenols to 60-65° C., adding an alkaline catalyst, stirring and activating to obtain a mixed solution;

[0044] The phenols are phenol or resorcinol, preferably phenol. Since the melting point of phenol is 40°C, phenol can become molten at this temperature. Because the reaction to generate phenolic prepolymer is an exothermic reaction, if the heating temperature of phenol is too high, it is not conducive to the progress of the exothermic reaction, so the heating temperature can be controlled between 40°C-60°C, preferably 50°C.

[0045] Wherein, the basic catalyst is a mixture of sodium hydroxide and barium hydroxide, and the mol ratio of the sodium hydroxide and barium hydroxide is preferably 2:1; the basic catalyst cons...

Embodiment 1

[0062] Put the three-necked flask equipped with a stirrer and a condenser into an electric heating constant temperature water bath, add 235.3g of phenol, adjust the temperature to 50°C, and melt the phenol into a liquid; add sodium hydroxide and barium hydroxide (molar ratio: 2: 1) A total of 4.65g, stirred for 20min; added 75.0g of formaldehyde solution (concentration: 40%), heated up to 60°C, and kept for 50min; cooled to obtain a phenolic prepolymer, and its methylol content was detected according to GB / T 14074-2006 method was 19.53%.

[0063] Take 90.0 g of phenolic prepolymer, add 10.0 g of anthranilic acid, and mix evenly to obtain a modified phenolic crosslinking agent. The shelf life of the cross-linking agent is 12 months.

[0064] Prepare a partially hydrolyzed polyacrylamide solution with a mass fraction of 0.2%, and after aging for 24 hours, add a modified phenolic cross-linking agent to make the mass fraction 0.2%, and react at a constant temperature of 120°C for...

Embodiment 2

[0067] Put the three-neck flask equipped with a stirrer and a condenser in an electric heating constant temperature water bath, add 263.5g of phenol, adjust the temperature to 40°C, and melt the phenol into a liquid; add sodium hydroxide and barium hydroxide (the molar ratio is 2: 1) A total of 6.85g, stirred for 30min; added 78.9g of formaldehyde solution (concentration 38%), heated to 60°C, kept for 50min; cooled to obtain phenolic prepolymer, and its methylol content was detected according to GB / T 14074-2006 method was 18.92%.

[0068] Take 90.0 g of phenolic prepolymer, add 10.0 g of anthranilic acid, and mix evenly to obtain a modified phenolic crosslinking agent. The shelf life of the cross-linking agent is 18 months.

[0069] Prepare a partially hydrolyzed polyacrylamide solution with a mass fraction of 0.3%, and after aging for 24 hours, add a modified phenolic cross-linking agent to make the mass fraction 0.2%, and react at a constant temperature of 80°C for 120 hour...

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Abstract

The invention discloses a modified phenolic cross-linking agent, a method for preparing the same and application of the modified phenolic cross-linking agent, and belongs to the technical field of oilfield chemistry. The modified phenolic cross-linking agent comprises, by weight, 90-95 parts of phenolic prepolymers and 5-10 parts of stabilizers. Reaction is carried out on phenols and formaldehyde with the molar ratio of 2.5:1-3:1 under the effect of alkali catalysts to obtain the phenolic prepolymers, and the content of hydroxymethyl in the phenolic prepolymers is 18.92-23.34%; the stabilizers comprise amino-substituted benzoic acid. The modified phenolic cross-linking agent, the method and the application have the advantages that the storage effective life of the modified phenolic cross-linking agent at the room temperature is longer than 6 months; when the modified phenolic cross-linking agent is applied to preparing cross-linked polymer gel profile control agents, the gel forming temperatures are 80-120 DEG C, the gel forming time is 24-120 h, formed gel systems are stable, the viscosity of gel can reach 8000 mPa.s at least, and the modified phenolic cross-linking agent and the method are applicable to deep profile control and flooding operation treatment for injection wells and have excellent application prospects in the aspects of increase of crude oil recovery ratios during late development of oilfields with high water cut.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to a modified phenolic crosslinking agent and its preparation method and application. Background technique [0002] In the middle and late stages of oilfield development, replenishing formation energy through water injection is the main measure adopted by most oilfields in my country at present. Due to the complexity and heterogeneity of the reservoir formation, when the water injection rate increases, a large amount of water will be produced from the oil well, which seriously affects the water flooding development effect. In order to improve the effect of water injection and the ultimate recovery of the oil field, the technology of water plugging and profile control of the oil layer has been paid attention to and developed in the development of oil and gas fields. The cross-linking agent can react with polyacrylamide polymers to obtain gels with different viscosities, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/508C08G8/10C08G8/22
CPCC08G8/10C08G8/22C09K8/5083C09K8/512
Inventor 孙磊王宇宾徐鸿志张贵清夏烨刘小攀郝志伟赵文娜李玉泉
Owner BC P INC CHINA NAT PETROLEUM CORP
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