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Foamer and foam gas flooding method

A foaming agent and gas technology, which is applied in the field of foam flooding, can solve the problems that the corrosion of injection equipment and oilfield injection-production system is difficult to control and affect the development of air foam flooding technology, and achieves strong foaming, good adaptability, and improved The effect of spillover efficiency

Active Publication Date: 2017-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an important factor affecting the development of air foam flooding is that the corrosion of air foam on injection equipment and oilfield injection-production systems is difficult to control, which seriously affects the development of air foam flooding technology.

Method used

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  • Foamer and foam gas flooding method

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Effect test

preparation example Construction

[0052] In a second aspect, the present invention provides a method for preparing a foaming agent, the method comprising: under stirring conditions, mixing the components of the foaming agent until they are completely dissolved.

[0053] In the third aspect, the present invention provides a foam gas flooding method, the method comprising: injecting a foaming agent containing a weak cationic amphoteric surfactant and gas into the oil reservoir for foam profile control and oil displacement.

[0054] In the method of the present invention, preferably, the foaming agent contains a weak cationic amphoteric surfactant and water, and based on the weight of the foaming agent, the content of the weak cationic amphoteric surfactant is 0.05-3 wt. %, the content of water is 97-99.95% by weight; further preferably, based on the weight of the foaming agent, the content of weak cationic amphoteric surfactant is 0.25-1% by weight, and the content of water is 99-99.75% by weight %.

[0055] Fo...

Embodiment 1

[0071] (1) Add 5g of dodecyldimethylamine oxide, 1.5g of dodecyltrimethylammonium chloride, 1.5g of dodecyldimethylbetaine, and 0.25g of lauryl alcohol into distilled water to 500mL, Stir for 30 minutes until completely dissolved to obtain 500 mL of foaming agent.

[0072] (2) Take 100mL to measure the foaming volume and foam half-life of the foaming agent. The foaming volume of the foaming agent is 860mL, and the foam half-life is 225min; take another 300mL foaming agent and 300mL distilled water to measure the corrosion rate respectively, and the corrosion rates of distilled water and foaming agent are 6.137g / (m 2 .h) and 0.0072g / (m 2 .h), the corrosion inhibition rate of the blowing agent is 99.88%.

Embodiment 2

[0074] (1) Add 2.5g octadecyldimethylamine oxide, 0.8g dodecyltriethylammonium chloride, 0.8g tetradecyldimethylbetaine, and 0.15g n-decyl alcohol into distilled water until 500mL, stirred for 30min until completely dissolved to obtain 500mL foaming agent.

[0075] (2) Take 100mL to measure the foaming volume and foam half-life of the foaming agent. The foaming volume of the foaming agent is 850mL, and the foam half-life is 190min; take another 300mL foaming agent and 300mL distilled water to measure the corrosion rate respectively, and the corrosion rates of distilled water and foaming agent are 6.137g / (m 2 .h) and 0.0081g / (m 2 .h), the corrosion inhibition rate of the blowing agent is 99.87%.

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Abstract

The invention relates to the field of foam flooding and discloses a foamer and a foam gas flooding method. The foamer comprises a weak-cationic amphoteric surfactant, water and at least one of cationic surfactant, amphoteric surfactant and alcohol. The foam gas flooding method comprises the steps of injecting the weak-cationic amphoteric surfactant containing foamer and gas into an oil reservoir, and carrying out foam profile control and oil displacement. According to the foamer and the method, disclosed by the invention, the foamer has high foamability, stability and profile control and oil displacement capability, so that the corrosion action on injection equipment and an oilfield injection-production system caused by air foam in an air foam flooding profile control and oil displacement process can be obviously lowered; and the foamer not only can be applied to a foam profile control and oil displacement process of ordinary strata, but also can be applicable to the foam profile control and oil displacement process under the condition that stratum water is high in degree of mineralization and high in calcium and magnesium ion content.

Description

technical field [0001] The invention relates to the field of foam flooding, in particular to a foaming agent and a foam gas flooding method. Background technique [0002] Foam profile control and oil displacement are a process of injecting gas (or steam) into the formation and mixing with a foaming agent to form foam to enhance recovery. Foam has high apparent viscosity and air resistance effect, which can inhibit gas channeling during gas injection and improve the oil-water mobility ratio. At the same time, the foam fluid is selective and can preferentially seal high-permeability layers and high-water-bearing layers. Foam has a high resistance effect, and it can be carried out together with gas flooding or alone to expand the swept volume, which is an important method to enhance oil recovery. [0003] Foam flooding is the technology with the highest resistance coefficient among the currently tested EOR methods. The recovery factor can be enhanced by improving the sweep ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/594E21B43/22
CPCC09K8/584C09K8/594E21B43/168
Inventor 江建林
Owner CHINA PETROLEUM & CHEM CORP
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