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CO2 oil displacement method adopting amidino compound

A technology of amidine compound and oil displacement method, which is applied in the direction of chemical instruments and methods, drilling compositions, production fluids, etc., can solve problems such as low efficiency, difficult injection, and large adsorption loss of surfactants, so as to improve recovery Yield, lower interfacial tension, lower minimum miscibility pressure

Pending Publication Date: 2021-01-15
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 the problem that the existing minimum miscible pressure chemical agents such as liquefied petroleum gas and low-carbon alcohol are used in a large amount and the efficiency is low. Injection difficulties in permeable reservoirs, etc., provide a way to reduce CO 2 -Crude oil minimum miscible pressure method, using CO 2 , crude oil amphiphilic regulator, efficiently promote CO 2 Miscible with crude oil, reducing the minimum miscibility pressure of the two

Method used

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  • CO2 oil displacement method adopting amidino compound
  • CO2 oil displacement method adopting amidino compound
  • CO2 oil displacement method adopting amidino compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Components and content of miscible pressure regulator:

[0032] Surfactant A (R 1 =-C 12 h 25 ; 2 =-CH 3 ; 3 =-CH 3 ; 4 =-CH 3 ): 100;

[0033] Use concentration: 1.0% (regulator in CO 2 mass concentration in);

[0034] Crude oil: provided by Jiangsu Oilfield.

Embodiment 2

[0036] Components and content of miscible pressure regulator:

[0037] Surfactant A (R 1 =-C 12 h 25 ; 2 =-CH 3 ; 3 =-CH 3 ; 4 =-CH 3 ): 100;

[0038] Use concentration: 1.5% (regulator in CO 2 mass concentration in);

[0039] Crude oil: provided by Jiangsu Oilfield.

Embodiment 3

[0041] Components and content of miscible pressure regulator:

[0042] Surfactant B (R 1 =-C 16 h 33 ; 2 =-CH 3 ; 3 =-CH 3 ; 4 =-CH 3 ): 100;

[0043] Use concentration: 1.0% (regulator in CO 2 mass concentration in);

[0044] Crude oil: provided by Jiangsu Oilfield.

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Abstract

The invention relates to a CO2 oil displacement method adopting an amidino compound. The problems of high minimum miscible pressure and low oil displacement efficiency of CO2 immiscible displacement are mainly solved. By adopting the technical scheme thatthe CO2 oil displacement method is adopted and comprises the step of injecting CO2 and an amidino compound into an oil layer to be in contact with crude oil and water, wherein the amidino compound is selected from at least one of structures as shown in a formula (I) (please see the specifications for the formula), and in the formula, R1 is C1-C50 alkyl; and R2, R3 and R4 are independently selected from C1-C10 alkyl or substituted alkyl, the problems are well solved, and the CO2 oil displacement method can be applied to a CO2 oil displacement process.

Description

technical field [0001] The present invention relates to a kind of CO using amidine compound 2 Oil flooding methods and methods for reducing the minimum miscible pressure for carbon dioxide flooding. Background technique [0002] As low-permeability oil and gas fields account for an increasing proportion of newly proven oil and gas reserves, how to improve the recovery of low-permeability oil and gas reservoirs will become a new direction for oil and gas research and development in China and the world. Gas drive technology (such as natural gas, CO 2 , N 2 , air, etc.) is currently one of the most suitable methods for developing low-permeability reservoirs. CO 2 It reaches a supercritical state when the temperature is higher than 31.26°C and the pressure is higher than 7.2MPa. Supercritical CO 2 It has good solubility to crude oil and is an ideal displacement medium. [0003] CO 2 Flooding is divided into miscible flooding and immiscible flooding. Miscible flooding re...

Claims

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Application Information

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IPC IPC(8): E21B43/16C09K8/58
CPCE21B43/164C09K8/58Y02P20/54
Inventor 吴春芳李应成沙鸥
Owner CHINA PETROLEUM & CHEM CORP