Carbon dioxide oil displacement method

An oil displacement method and carbon dioxide technology, which are applied in chemical instruments and methods, earth-moving drilling and production, and bulk chemical production, etc. The effect of recovery factor, ease of recovery and treatment, and enhanced solubilization ability

Active Publication Date: 2021-11-16
SHANDONG DESHI CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventional CO 2 During the flooding process, there are defects such as gas channeling in the high-permeability zone in the oil layer, and the recovery factor is not ideal

Method used

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  • Carbon dioxide oil displacement method
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Examples

Experimental program
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Effect test

preparation example Construction

[0040] Table 1 Supercritical CO 2 Preparation conditions of microemulsion

[0041]

[0042] The supercritical CO produced by the preparation conditions of Examples 1-5 and Comparative Examples 1-10 was tested by displacement experiments. 2 Oil displacement effect of microemulsion.

[0043] 2. Displacement experiment

[0044] A natural core with a length of 5×5×10 cm was selected, and the gas permeability was 0.166×10 -3 μm 2 , porosity 8.8%. The oil sample used is kerosene with a density of 0.783g / cm at 25°C 3 , the viscosity is 1.318mPa·s.

Embodiment 6

[0046] A carbon dioxide flooding method, comprising the steps of: supercritical CO 2 The microemulsion was injected into the saturated kerosene core at a flow rate of 0.5mL / min to displace the kerosene, and the supercritical CO 2 The injection pressure of the microemulsion is 11MPa, the temperature is 50°C, and 0.6PV supercritical CO is injected 2 Stop flooding after the microemulsion, read the volume of kerosene displaced, and calculate the recovery factor.

Embodiment 7

[0048] A carbon dioxide flooding method, comprising the steps of: supercritical CO 2 The microemulsion was injected into the saturated kerosene core at a flow rate of 0.5mL / min to displace the kerosene, and the supercritical CO 2 The injection pressure of the microemulsion is 14MPa, the temperature is 55°C, and 1.2PV supercritical CO is injected 2 Stop flooding after the microemulsion, read the volume of kerosene displaced, and calculate the recovery factor.

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Abstract

The invention discloses a carbon dioxide oil displacement method, belonging to the technical field of carbon dioxide oil displacement. The carbon dioxide oil displacement method comprises the following steps: (1) injecting a supercritical CO2 microemulsion into an oil reservoir to displace crude oil so as to obtain produced gas and the crude oil; (2) pressurizing the produced gas, cooling the pressurized produced gas, feeding a cooled fluid into a gas-liquid separator, and separating out water vapor and C6 and above-C6 heavy hydrocarbons; (3) heating unseparated liquid in the step (2), introducing the heated unseparated liquid into an adsorption tower, filling the tower with an adsorbent for adsorbing CO2, and introducing the residual gas into a combustion boiler; (4) desorbing the adsorbent in the step (3) to release CO2 which is used for preparing a supercritical CO2 microemulsion, wherein the supercritical CO2 microemulsion is prepared from modified sodium alkyl benzene sulfonate, n-butyl alcohol, water and the CO2. According to the method, by injecting the supercritical CO2 microemulsion into the oil reservoir, the solubility of CO2 in the crude oil is increased, and the recovery rate of the crude oil is increased.

Description

technical field [0001] The application relates to a carbon dioxide flooding method, which belongs to the technical field of carbon dioxide flooding. Background technique [0002] With the continuous exploitation of traditional energy sources such as oil and natural gas, some old oil and gas fields have entered the middle and late stages of development, especially some low-permeability reservoirs. The recovery rate of traditional mining methods is generally not higher than 25%, so enhanced oil recovery has become a major domestic and foreign The choice of some oil companies. At present, domestic and foreign enhanced oil recovery methods include thermal methods, chemical methods, gas injection methods, and microbial methods, etc. The oil displacement mechanism is mainly to reduce the mobility ratio of displacement fluid to crude oil and interfacial tension, thereby increasing the displacement sweep range and washing effect. oil efficiency. Among them, gas flooding is benefic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594C09K8/88C09K8/60C09K8/584C08G65/334E21B43/22
CPCC09K8/594C09K8/885C09K8/604C09K8/584C08G65/3346E21B43/164Y02P20/54
Inventor 崔仕章宋新旺郭玉玺王黎明崔盈贤侯云福高瑞美张向红刘小芳郭鑫
Owner SHANDONG DESHI CHEM IND CO LTD
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