Method for oil displacement using carbon dioxide and foam

A technology of carbon dioxide and foam flooding, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problem of extremely large density difference, achieve the effect of simple operation and improve oil displacement efficiency

Inactive Publication Date: 2015-12-09
NORTHWEST UNIV(CN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluidity of gas is higher than that of water, and the density difference between gas and oil is extremely large, so there are serious deficiencies in viscous fingering and gravity overriding.

Method used

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  • Method for oil displacement using carbon dioxide and foam
  • Method for oil displacement using carbon dioxide and foam

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] The nonionic surfactant alkyl glucoside (APG1214) mass fraction of preparation is 0.3%, and the aqueous solution of NaCl content is 60g / L.

[0017] The following steps are all carried out under the condition of simulated formation temperature of 50°C.

[0018] For a diameter of 2.50 cm and a length of 10.0 cm, saturated water and saturated oil are processed. The core parameters of this experiment are: porosity 15.19%, pore volume 7.364mL, gas permeability 8.035mD, original oil saturation 44.3%.

[0019] Carry out water flooding on the above core until the water content at the outlet exceeds 98%, the injection pressure is 4.0MPa, and the water flooding efficiency is 28.2%.

[0020] Under the condition of injection pressure of 4.0MPa, 0.1PV of the prepared surfactant solution and 0.1PV of carbon dioxide gas were injected alternately three times, with a total injection volume of 0.6PV.

[0021] Subsequent water flooding until the water content at the outlet is above 98%,...

example 2

[0023] Prepare two types of ionic surfactant cocamidopropyl betaine (CAB-35) mass fraction is 0.3%, NaCl content is the aqueous solution of 60g / L.

[0024] The following steps are all carried out under the condition of simulated formation temperature of 50°C.

[0025] For a diameter of 2.50 cm and a length of 10.0 cm, saturated water and saturated oil are processed. The core parameters of this experiment are: porosity 14.89%, pore volume 7.180mL, gas permeability 7.271mD, original oil saturation 52.5%.

[0026] Carry out water flooding on the above core until the water content at the outlet exceeds 98%, the injection pressure is 4.0MPa, and the water flooding efficiency is 27.4%.

[0027] Under the condition of injection pressure of 4.0MPa, 0.1PV of the prepared surfactant solution and 0.1PV of carbon dioxide gas were injected alternately three times, with a total injection volume of 0.6PV.

[0028] Subsequent water flooding until the water content at the outlet is above 98%...

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Abstract

The invention discloses a method for oil displacement using carbon dioxide and foam. The method can be applied to low-permeability high-mineralization stratums, carbon dioxide and an aqueous solution containing a foaming agent are alternately injected to raise the efficiency of oil displacement, the low permeability means that the permeability is within the range of 1 to 10 mD, and the high mineralization means that the mineralization is less than 100 g / L. The method for oil displacement using carbon dioxide and foam is easy to operate, oil displacement using carbon dioxide and oil displacement using foam are combined, defects of oil displacement using a single material can be overcome, and the efficiency of oil displacement in low-permeability high-mineralization stratums can be distinctly raised.

Description

technical field [0001] The invention relates to a method for increasing oil recovery, which belongs to the technical field of oil exploitation, in particular to a method for flooding oil with carbon dioxide foam. Background technique [0002] In the prior art, carbon dioxide flooding is usually used in the gas injection development of oil fields. When gas is injected to displace crude oil, it can be mixed with crude oil to form gas-liquid miscible displacement, eliminating the influence of phase interface, thereby improving the efficiency of gas flooding. However, the fluidity of gas is higher than that of water, and the density difference between gas and oil is extremely large, so there are serious deficiencies in viscous fingering and gravity overriding. [0003] Foam flooding will form a mixed system of gas as the dispersed phase and surfactant solution as the dispersion medium-foam, which has a much higher apparent viscosity than gas and surfactant solution, and its flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 赵建社丁其杰韩长喜刘哲张荣兰
Owner NORTHWEST UNIV(CN)
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