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
CN107227147AActive Publication Date: 2017-10-03CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2017-10-03

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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.
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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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