Polymer for crude oil pour point depressing and preparation method and application thereof

A technology of crude oil point depressant and crude oil point depressant, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of single chemical bond, limited effect of point point depressant, poor effect of point point depressant, etc., and achieve simple process, It is conducive to the promotion and use of industrialization, and is convenient for mining and transportation.

Active Publication Date: 2021-09-28
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] EVA pour point depressant is an ethylene-vinyl acetate copolymer pour point depressant, which is cheap and has been successfully applied in some oil fields. However, due to its strong pertinence, different crude oils are suitable for different types of pour point depressants. Coagulation effect is not good
The maleic anhydride copolymer type pour point depressant is formed by the copolymerization of maleic anhydride and many monomers. It is widely used because of its excellent pour point depressing effect and strong applicability. The chemical bonds contained in the chain are relatively single, so its depressing effect is limited

Method used

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  • Polymer for crude oil pour point depressing and preparation method and application thereof
  • Polymer for crude oil pour point depressing and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of crude oil pour point depressant, specifically comprising the following steps:

[0037] (1) Preparation of polymer:

[0038] 1) Add monomers acrylonitrile, fumaric acid and styrene with a molar ratio of 2:15:3 to xylene, which is half of the total mass of the monomers, keep stirring at 80°C for 30 minutes, and add benzoyl peroxide , reacted for 6h, and the consumption of benzoyl peroxide was 1% of the total mass of the monomers to obtain a terpolymer;

[0039] 2) Mix the above-mentioned terpolymer with a molar ratio of 1:2 and C18 fatty primary amine, carry out amidation reaction at a temperature of 115°C, react for 3h, heat up to 155°C for 1h, and obtain a terpolymer ( In formula Ⅰ, R 1 for H, R 2 is H; in formula III, R 3 is C18 alkyl, R 4 C18 alkyl), the molecular weight of the polymer is 3000-5000;

[0040] (2) Preparation of synergist:

[0041]Add oleic acid glyceride dropwise to methyl-terminated allyl polyether, the mass ratio of met...

Embodiment 2

[0044] A preparation method of crude oil pour point depressant, specifically comprising the following steps:

[0045] (1) Preparation of polymer:

[0046] 1) Add the monomers acrylonitrile, fumaric acid and styrene with a molar ratio of 2:15:3 to toluene, which is half of the total mass of the monomers, keep stirring at 80°C for 30 minutes, and then add tert-butyl hydroperoxide , reacted for 6h, and the consumption of tert-butyl hydroperoxide was 0.5% of the total mass of the monomers to obtain a terpolymer;

[0047] 2) Mix the above-mentioned terpolymer with a molar ratio of 1:2 and C18 fatty primary amine, carry out amidation reaction at a temperature of 115°C, react for 3h, heat up to 155°C for 1h, and obtain a terpolymer ( In formula Ⅰ, R 1 for H, R 2 is H; in formula III, R 3 is C18 alkyl, R 4 C18 alkyl), the molecular weight of the polymer is 3000-5000;

[0048] (2) Preparation of synergist:

[0049] Add oleic acid glyceride dropwise to methyl-terminated allyl pol...

Embodiment 3

[0052] A preparation method of crude oil pour point depressant, specifically comprising the following steps:

[0053] (1) Preparation of polymer:

[0054] 1) Add monomers methacrylonitrile, fumaric acid and styrene with a molar ratio of 3:13:4 to xylene with a total monomer mass of 2 / 3, keep stirring at 75°C for 40 minutes, add iso Propylbenzene hydroperoxide, reaction 7h, the consumption of cumene hydroperoxide is 2% of monomer gross mass, makes terpolymer;

[0055] 2) Mix the above-mentioned terpolymer with a molar ratio of 1:1.2 and C20 fatty primary amine, carry out amidation reaction at a temperature of 105°C, react for 4 hours, heat up to 150°C and dehydrate for 1.5h to obtain a terpolymer (In Formula I, R 1 for H, R 2 Is C1 alkyl; in formula II or formula III, R 3 is C20 alkyl, R 4 is C20 alkyl), the molecular weight of the polymer is 3000-5000;

[0056] (2) Preparation of synergist:

[0057] Add oleic acid glyceride dropwise to butyl-terminated allyl polyether, ...

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Abstract

The invention discloses a polymer for crude oil pour point depressing and a preparation method and application thereof. The polymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit with the structure represented by a formula I, the structural unit B is a structural unit with the structure represented by a formula II or a formula III, and the structural unit C is a structural unit with the structure represented by a formula IV; and on the basis of the weight of the polymer, the weight percentage content of the structural unit A is 5%-25%, the weight percentage content of the structural unit B is 40%-85%, and the weight percentage content of the structural unit C is 10%-35%. The fumaric acid polymer in the polymer is good in rigidity and uniform in polar part distribution, and the long-chain structure of the fumaric acid polymer can act with wax crystals in the high-solidification-point crude oil; the amide structure is high in polarity, and the wax crystal structure can be better adjusted; and polar groups act with colloid and asphaltene in the high-solidification-point crude oil, and the solidification point of the crude oil is reduced.

Description

technical field [0001] The application relates to a polymer for pour point depressing of crude oil and a preparation method thereof, a crude oil pour point depressant and a preparation method thereof, and the polymer or crude oil pour point depressant for crude oil pour point depressing in waxy crude oil The application in the invention belongs to the technical field of oilfield chemicals. Background technique [0002] Most of my country's crude oil is waxy crude oil. When the temperature is close to the wax precipitation point, waxy crude oil is easy to precipitate wax crystals. As the temperature further decreases, the number of wax crystals increases and grows and aggregates to form wax with a three-dimensional network structure. Pasty substances make crude oil illiquid. This leads to high freezing point and poor low-temperature fluidity of waxy crude oil, which brings difficulties to the extraction and transportation of crude oil. [0003] The pour point depressant can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/32C08F222/02C08F220/46C08F212/10C08F220/50C09K8/588
CPCC08F8/32C09K8/588C08F222/02C08F220/46C08F212/10C08F220/50
Inventor 崔仕章修宗明王黎明宋新旺高瑞美吕志凤
Owner DESHI ENERGY TECH GRP CO LTD
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