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Ploroglucinol polyether carboxylate and composition and preparation method thereof, and viscosity reducing and efficiency improving method for CO2 flooding of deep low-permeability thickened oil

A phloroglucinol polyether carboxylate and a preparation method are applied in the directions of carboxylate preparation, drilling compositions, chemical instruments and methods, and can solve the problem of poor injectability of oil displacement chemicals and synergistic viscosity reduction. The problems of low efficiency and low viscosity reduction rate of heavy oil can improve the dissolution rate, facilitate transportation, and reduce the viscosity of heavy oil.

Pending Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is that the existing heavy oil CO 2 CO in flooding technology 2 Low solubility and slow dissolution rate in heavy oil lead to low viscosity reduction rate of heavy oil, low displacement efficiency and existing heavy oil CO 2 Poor injection of chemical agents for oil displacement, and CO 2 Cooperating with the problem of low viscosity reduction efficiency, a composition containing phloroglucinol polyether carboxylate and phloroglucinol polyether carboxylate is provided

Method used

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  • Ploroglucinol polyether carboxylate and composition and preparation method thereof, and viscosity reducing and efficiency improving method for CO2 flooding of deep low-permeability thickened oil
  • Ploroglucinol polyether carboxylate and composition and preparation method thereof, and viscosity reducing and efficiency improving method for CO2 flooding of deep low-permeability thickened oil
  • Ploroglucinol polyether carboxylate and composition and preparation method thereof, and viscosity reducing and efficiency improving method for CO2 flooding of deep low-permeability thickened oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (a) preparation of phloroglucinol polyether carboxylate:

[0071] 1. Add 126g of anhydrous phloroglucinol (1mol), 4.6g of potassium hydroxide in the pressure reactor, and remove the air in the reaction flask by vacuum. N 2 Under protection, the system was heated to 120° C., and 264 g (6 mol) of ethylene oxide was slowly introduced to control the pressure to ≤0.10 MPa. After the reaction was completed, the temperature was lowered to 90° C., the low boilers were removed under reduced pressure, neutralized and dehydrated after cooling to obtain 372.1 g of phloroglucinol polyoxyethylene (n=6) ether, with a yield of 95.4%.

[0072] ② Add 195 g (0.5 mol) phloroglucinol polyoxyethylene (n=6) ether, 140 g (0.7 mol) lauric acid, and 2.5 g sodium bicarbonate to the dry reactor, and remove oxygen in a vacuum. in N 2 Under protection, the system was heated to 215°C and reacted for 2h. After cooling, it was neutralized and dehydrated to obtain 308.9 g of phloroglucinol polyoxyet...

Embodiment 2

[0078] (a) preparation of phloroglucinol polyether carboxylate:

[0079] 1. Add 126g of anhydrous phloroglucinol (1mol), 4.6g of potassium hydroxide in the pressure reactor, and remove the air in the reaction flask by vacuum. N 2Under protection, the system was heated to 120° C., and 348 g (6 mol) of propylene oxide was slowly introduced to control the pressure to ≤0.20 MPa. After the reaction was completed, the temperature was lowered to 90° C., the low boilers were removed under reduced pressure, neutralized and dehydrated after cooling to obtain 460.3 g of phloroglucinol polyoxypropylene (n=6) ether, with a yield of 97.1%.

[0080] ②Add 237g (0.5mol) phloroglucinol polyoxypropylene (n=6) ether, 100g (0.5mol) lauric acid, and 2.5g sodium bicarbonate to the dry reactor, and remove oxygen in vacuum. in N 2 Under protection, the system was heated to 215°C and reacted for 2h. After cooling, it was neutralized and dehydrated to obtain 321.4 g of phloroglucinol polyoxypropylen...

Embodiment 3

[0086] (a) preparation of phloroglucinol polyether carboxylate:

[0087] 1. Add 126g of anhydrous phloroglucinol (1mol), 4.6g of potassium hydroxide in the pressure reactor, and remove the air in the reaction flask by vacuum. N 2 Under protection, the system was heated to 120° C., and 432 g (6 mol) of butylene oxide was slowly introduced to control the pressure to ≤0.20 MPa. After the reaction, the temperature was lowered to 90° C., the low boilers were removed under reduced pressure, neutralized and dehydrated after cooling to obtain 523.4 g of phloroglucinol polyoxybutylene (n=6) ether, with a yield of 93.8%.

[0088] ②Add 279g (0.5mol) phloroglucinol polyoxybutylene (n=6) ether, 80g (0.4mol) lauric acid, and 2.5g sodium bicarbonate to the dry reactor, and remove oxygen in vacuum. in N 2 Under protection, the system was heated to 215°C and reacted for 2h. After cooling, it was neutralized and dehydrated to obtain 344.4 g of phloroglucinol polyoxybutylene (n=6) ether laur...

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Abstract

The invention discloses phloroglucinol polyether carboxylate as well as a composition and a preparation method thereof, and a viscosity reducing and efficiency improving method for CO2 flooding of deep low-permeability thickened oil. The phloroglucinol polyether carboxylate has a structure as shown in a formula (I) which is described in the specification. The composition comprises the phloroglucinol polyether carboxylate and an auxiliary agent as shown in a formula (II) which is described in the specification. The chemical agent composition is directly dissolved in supercritical or liquid CO2, then is injected into a stratum, and acts with CO2 and thickened oil under a stratum condition, so the dissolving property of CO2 in the thickened oil is improved. According to the chemical agent-assistedviscosity reducing and efficiency improving method for CO2 flooding of the deep low-permeability thickened oil, the viscosity of thickened oil is efficiently reduced, the flowing property of the thickened oil is greatly improved, and the injection problem of a deep low-permeability thickened oil reservoir is solved.

Description

technical field [0001] The present invention relates to the field of petroleum exploitation, specifically, relate to a kind of phloroglucinol polyether carboxylate and its composition, preparation method and deep layer low permeability heavy oil CO 2 The method of reducing viscosity and increasing efficiency. Background technique [0002] my country is rich in heavy oil resources, and onshore heavy oil and asphalt resources account for more than 20% of the country's total oil resources. With the reduction of conventional crude oil production, heavy oil production is becoming more and more important. Due to the characteristics of high colloid and asphaltene content, high underground viscosity and poor fluidity of heavy oil, steam huff and puff thermal recovery technology is the main technology for heavy oil development. However, steam huff and puff thermal recovery is generally applicable to heavy oil reservoirs with buried depth less than 1800m, permeability greater than 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/28C07C67/08C09K8/594E21B43/16
CPCC07C69/28C09K8/594E21B43/164E21B43/16Y02P20/54
Inventor 吴春芳李应成沈之芹马俊伟
Owner CHINA PETROLEUM & CHEM CORP
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