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Oil extraction method

A technology for oil reservoirs and crude oil, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., which can solve problems such as fast advance, difficult on-site control, and high risk of fire lines breaking into horizontal wellbore, so as to expand the affected area and reduce the The risk of capital investment and the effect of wide application range of technology

Active Publication Date: 2014-11-05
PETROCHINA CO LTD
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Problems solved by technology

[0005] The present invention provides an oil production method to solve the problem of rapid combustion coning along the direction of the horizontal wellbore, high risk of the fire line breaking into the horizontal wellbore, or difficulty in on-site control in the existing fire-flooding assisted gravity drainage technology for horizontal wells. The problem

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Embodiment 1

[0043] In the numerical simulation study of oilfield blocks, the model made a comparison between those without horizontal fractures and those with horizontal fractures. Basic reservoir parameters: porosity 30%, oil saturation 75%, permeability 2000md, oil layer thickness 10m, crude oil degassing viscosity at reservoir temperature 500000mPa.s. Injection-production parameters in preheating stage: bottom hole dryness 75%, maximum steam injection pressure 4.0MPa. Gas injection parameters in the ignition stage: the bottom hole injection air temperature is 480°C, and the daily air injection is 5,000 cubic meters.

[0044] Basic parameters of well pattern: horizontal well length 200m, horizontal well spacing 100m.

[0045] Basic parameters of fractures: Research shows that the permeability of fractures is generally several hundred to several thousand darcies, and the fracture width is generally 4-10mm. Considering that the minimum grid of the numerical simulation model is 0.2m, the ...

example 2

[0049] The depth of a certain reservoir is 200m, the thickness of the oil layer is 10m, the horizontal permeability of the oil layer is 2000md, and the temperature of the oil layer is 18°C; the degassed viscosity of crude oil at the reservoir temperature is 500000mPa.s, the oil saturation is 75%, and the dip angle of the oil layer is 6°. Injection-production parameters in preheating stage: bottom hole dryness 75%, steam injection pressure 3-4MPa, daily steam injection 70-80 tons per day. Gas injection parameters in the ignition stage: the temperature of the air injected at the bottom of the well is above 480°C after being heated by an electric igniter, and the daily air injection is 3000-4000 cubic meters.

[0050] Basic parameters of the fracture: the width of the fracture is 4-10mm, and the maximum fracture radius is 40-50m.

[0051] 1) Screening according to the characteristics of the reservoir, in line with the screening criteria for fracturing single horizontal well fire ...

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Abstract

The invention discloses an oil extraction method for extracting raw oil in a horizontal well. The oil extraction method comprises the steps of: A, fracturing the horizontal well; and B, performing horizontal well fireflood assisted gravity drainage on the fractured horizontal well. According to the oil extraction method, the fracturing technology is combined with the single horizontal well fireflood assisted gravity drainage extraction technology, the double advantages of horizontal crack leading fireflood front edge expansion and gravity assisted drainage are made full use of, and a thick oil deposit with an oil layer thickness of more than 4m can be economically and effectively developed.

Description

technical field [0001] The invention relates to the field of oil recovery technology, and belongs to a heavy oil thermal recovery method. 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, 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 combustion and releas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/247
Inventor 席长丰周游关文龙梁金中马德胜王红庄蒋有伟李秀峦张忠义刘春泽吴键
Owner PETROCHINA CO LTD
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