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Oil extraction method applied to oil exploration

A technology for oil exploration and oil reservoirs, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of low production and small fire flooding affected area, achieve fast investment recovery, increase fire flooding swept volume, The effect of stable and safe production operation

Inactive Publication Date: 2020-04-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of existing technologies, an oil recovery method applied to oil exploration is proposed to solve the problems of small fire flooding lateral (well spacing direction) and low production.

Method used

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] An oil recovery method applied to oil exploration, comprising the following steps: 1) setting a horizontal well at the bottom of the oil layer, and setting a vertical well directly above the toe of the horizontal well; 2) fracturing the horizontal well; 3) sequentially Steam preheating stage, ignition stage and production stage, in which, in the steam preheating stage, the horizontal well adopts the preheating method of long pipe injection and short pipe production, and the vertical well adopts low pressure huff and puff production; Fire flooding assisted gravity drainage of horizontal wells.

[0020] Wherein, the v...

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Abstract

The invention discloses an oil extraction method applied to oil exploration. The oil extraction method comprises the following steps that (1) a horizontal well is arranged at the bottom of an oil layer, and a vertical well is arranged over the toe end of the horizontal well; (2) fracturing is conducted on the horizontal well; (3) a steam preheating stage, an ignition stage and a production stage are conducted sequentially, wherein at the steam preheating stage, a long pipe injection and short pipe extraction mode is adopted for the horizontal well, and low-pressure huff and puff production isadopted for the vertical well; and (4) horizontal well fireflooding auxiliary gravity oil drainage is conducted on the fractured horizontal well. Through the oil extraction method, the problems that the fireflooding transverse (the well spacing direction) spread range is small, and the yield is low are solved.

Description

technical field [0001] The invention relates to the technical field of oil extraction, in particular to an oil extraction method applied in oil exploration. Background technique [0002] At present, the main technology of heavy oil production is still steam injection technology, including steam huff and puff, steam flooding, and steam-assisted gravity drainage technology. However, steam injection consumes a lot of energy, has poor economic and social benefits, and has great pressure on energy conservation and environmental protection. [0003] In recent years, a horizontal well fire flooding assisted gravity drainage technology has emerged, which is called THAI technology (Toe to Heel Air Injection) abroad. This technology was first invented in 1991 by Malcolm.Greaves of the University of Bath in the United Kingdom. Horizontal well fire flooding assisted gravity drainage refers to: oil layer is set at the bottom of the well, and then air is continuously injected to maintain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/26E21B43/30E21B43/32
CPCE21B43/168E21B43/24E21B43/2408E21B43/243E21B43/26E21B43/305E21B43/32
Inventor 李艺恬闫鑫源
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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