Method for improving carbon dioxide displacement yield by using surfactants

A technology of surfactants and carbon dioxide, applied in chemical instruments and methods, mixing methods, production fluids, etc., can solve the problem of expanding the swept volume, harsh conditions for the use and selection of surfactants, and unclear improvement of oil recovery and other issues to achieve good recovery and enhanced recovery

Inactive Publication Date: 2016-01-20
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the first time, this technology applies air-soluble surfactants to carbon dioxide flooding, but it is necessary to use air-soluble surfactants such as fatty alcohol polyoxyethylene polyoxypropylene ether (2EH-PO5-EO9) or nonylphenol polyoxyethylene ether (TX -15), the use of this type of surfactant to control carbon dioxide mobility by underground foami

Method used

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  • Method for improving carbon dioxide displacement yield by using surfactants
  • Method for improving carbon dioxide displacement yield by using surfactants
  • Method for improving carbon dioxide displacement yield by using surfactants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Embodiment, surfactant-carbon dioxide composite oil displacement agent and its preparation

[0023] Each parameter in the method of the present invention is adjusted according to the description in Table 1, and specific examples 1-9 of the method for enhancing the recovery of carbon dioxide flooding by using surfactants are provided.

[0024] The specific method is: mix surfactant and supercritical carbon dioxide according to the ratio of (0.00061:1) to (0.00338:1) in mass ratio to obtain surfactant-carbon dioxide composite oil displacement agent (fluid), and then the composite flooding The oil agent is injected into the oil reservoir.

[0025] Considering the critical point of carbon dioxide (pressure 7.4MPa, temperature 31.2° C.), the selected pressure is 8 MPa and the temperature is 50° C. during the mixing of the examples. Of course, other values ​​above the critical point of carbon dioxide can theoretically complete the preparation of surfactant-carbon dioxide com...

experiment example 1

[0033] Experimental example 1. Interfacial tension experiment with crude oil

[0034] Use a high-pressure carbon dioxide interfacial tension meter to measure the interfacial tension between carbon dioxide and crude oil after adding a surfactant at 86°C (the oil layer temperature of the No. 8 Oil Production Plant of Daqing Oilfield), and set the pressure when the interfacial tension is zero to be the minimum miscible pressure for one contact. Test Methods as below:

[0035] (1) Turn on the high-pressure carbon dioxide injection system, turn on the oil container heating and pipeline heating.

[0036] (2) Turn on the heating in the kettle and turn on the photographic light source.

[0037] (3) Start the software, capture the image, correct the image magnification, and adjust the image definition.

[0038] (4) Add the surfactant to be tested into the heating and stirring apparatus, add a certain amount of carbon dioxide (to a container pressure slightly higher than 8MPa), and st...

experiment example 2

[0053] Experimental example 2: Slim tube displacement experiment with crude oil

[0054] The supporting device of the thin tube displacement experiment was used to measure the oil recovery rate of carbon dioxide flooding under different pressure conditions at 86°C, and the minimum miscible pressure of multiple contact was defined as the pressure when the oil recovery rate exceeded 90%. The data in Table 5 were used to simulate The minimum miscible pressure is calculated together, see Table 6, and the test method is as follows:

[0055] (1) According to the high-pressure physical properties of formation oil, natural gas and degassed crude oil were used to prepare formation oil at 85.9 °C, and its high-pressure physical properties were measured.

[0056] (2) After heating the thin tube to a constant temperature, evacuate it, press the prepared saturated oil sample into the thin tube model with a constant pressure pump, stop the pump when the pump is 2PV, and record the volume of...

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Abstract

The invention discloses a method for improving the carbon dioxide displacement yield by using surfactants. The method comprises the following steps of: uniformly mixing selected surfactants and supercritical carbon dioxide according to a mass ratio being (0.00061:1) to (0.00338:1) under the conditions of the pressure being 8MPa and the temperature being 50 DEG C to be used as displacement agents; and injecting the displacement agents into an oil reservoir. The method has the advantages that the surfactants capable of reducing the minimum miscibility pressure of carbon dioxide and crude oil can be preferably selected; and when the surfactants are added in the injected carbon dioxide for carbon dioxide displacement operation, the carbon dioxide displacement yield can be improved.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide flooding additives, in particular to a method for using a surfactant to increase the recovery rate of carbon dioxide flooding. Background technique [0002] In recent years, due to the excessive dependence of human beings on fossil fuels such as coal, oil, and natural gas, the amount of greenhouse gas emissions produced by industry and human life has increased day by day, and the resulting greenhouse effect is seriously threatening the environment on which human beings depend for survival. Among the greenhouse gases emitted by humans, more than 65% are carbon dioxide, and about 69% of these carbon dioxide are related to energy supply and use. How to achieve the reduction of greenhouse gas emissions and meet the increasing energy demand of mankind has become a major issue facing the international community. [0003] Carbon dioxide flooding technology is a kind of supercritical carbon dioxid...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/22C09K8/594C09K8/584B01F3/08
CPCY02P20/54
Inventor 程杰成庞志庆白文广刘性全雷友忠刘勇汪艳勇熊霄
Owner PETROCHINA CO LTD
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