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A carbon dioxide flooding method

An oil displacement method and carbon dioxide technology, which are applied in chemical instruments and methods, earthwork drilling, and bulk chemical production, etc., can solve the problems of easy gas channeling and unsatisfactory recovery in high-permeability strips, and improve crude oil. Recovery factor, easy recovery and treatment, and the effect of improving adsorption capacity

Active Publication Date: 2022-03-08
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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  • A carbon dioxide flooding method
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Examples

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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 application discloses a carbon dioxide flooding method, which belongs to the technical field of carbon dioxide flooding. A carbon dioxide flooding method, comprising the steps of: (1) supercritical CO 2 The microemulsion is injected into the oil reservoir to displace crude oil, and the produced gas and crude oil are obtained; (2) The produced gas is pressurized and cooled, and the cooled fluid enters the gas-liquid separator to separate water vapor and C 6 The above heavy hydrocarbons; (3) Heat the unseparated liquid in step (2) and introduce it into the adsorption tower, which is filled with adsorbent for the adsorption of CO 2 , the remaining gas enters the combustion boiler; (4) CO is released after desorption of the adsorbent in step (3) 2 , for the preparation of supercritical CO 2 microemulsion; wherein, the supercritical CO 2 The microemulsion was composed of modified sodium alkylbenzene sulfonate, n-butanol, water and CO 2 composition. This method injects supercritical CO into the reservoir 2 microemulsion, increased CO 2 Solubility in crude oil improves oil recovery.

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 Patents(China)
IPC IPC(8): C08G65/334C09K8/594C09K8/88C09K8/60C09K8/584E21B43/22
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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