Oil deposit extraction method of solvent assisted fireflooding gravity drainage

A technology for gravity drainage and heavy oil reservoirs, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of high oil layer resistance, fire escape, hidden safety hazards, etc., and achieve the expansion of the combustion surface and the flow The effect of high capacity and low flow resistance

Active Publication Date: 2013-05-08
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

Laboratory experiments show that the fire flooding gravity drainage technology has the advantages of simple well pattern, fast production rate, and high recovery rate. However, Petrobank's THAI pilot test in the Whitesands project area shows that the fundamental limitations of THAI technology include the following three points The first is that when the coking zone in the burning process of the oil layer is relatively thin, and the sealing performance of the horizontal combustion section of the horizontal production well is poor, the air injected by the vertical injection well will easily enter the horizontal section of the horizontal production well, causing fire to escape, thereby burning If the screen in the horizontal section is damaged, there will be serious safety hazards; second, for ultra-hea

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  • Oil deposit extraction method of solvent assisted fireflooding gravity drainage
  • Oil deposit extraction method of solvent assisted fireflooding gravity drainage
  • Oil deposit extraction method of solvent assisted fireflooding gravity drainage

Examples

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Embodiment 1

[0053] This embodiment provides a method for recovering a heavy oil reservoir by solvent-assisted fire flooding gravity drainage. The main oil layer of this heavy oil reservoir is buried shallowly, with an average buried depth of 450m, an original reservoir pressure of 4.2MPa, and an original reservoir temperature of 26°C; the viscosity of crude oil is high, the viscosity of degassed crude oil at the reservoir temperature is 1 million centipoise, and the effective average thickness of the reservoir is 15m.

[0054] The solvent-assisted fire flooding gravity drainage recovery method for heavy oil reservoirs provided in this embodiment includes the following specific steps:

[0055] (1) First, two pairs of adjacent horizontal production wells and vertical injection well injection-production well patterns are set in the production area of ​​the heavy oil reservoir. Specifically, one horizontal production well and one vertical Injection wells form an injection-production well grou...

Embodiment 2

[0071] This embodiment provides a method for recovering a heavy oil reservoir by solvent-assisted fire flooding gravity drainage. The average buried depth of the main oil layer of the heavy oil reservoir is 400m, the original reservoir pressure is 3.7MPa, and the original reservoir temperature is 23°C; The viscosity of degassed crude oil at the reservoir temperature is 10,000 centipoise, and the effective average thickness of the reservoir is 30m.

[0072] The solvent-assisted fire flooding gravity drainage recovery method for heavy oil reservoirs provided in this embodiment includes the following specific steps:

[0073] (1) First, two pairs of adjacent horizontal production wells and vertical injection well injection-production well patterns are set in the production area of ​​the heavy oil reservoir. Specifically, one horizontal production well and one vertical Injection wells form an injection-production well group; preferably, the lateral distance of the horizontal sectio...

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Abstract

The invention relates to an oil deposit extraction method of solvent assisted fireflooding gravity drainage. The method comprises a first step that the extraction area of the oil deposit is provided with a horizontal producing well and an injection-production pattern of a vertical injecting well, the horizontal producing well and the vertical injecting well are arranged on the same vertical section of the same oil layer and form an injection-production well group, and a second step that a cosolvent horizontal well is arranged between the adjacent injection-production well group of the oil layer in the first step. The cosolvent has the function of dissolving and viscosity reduction of the crude oil, the viscosity of the oil layer on the flank of the horizontal producing well of the injection-production well group is reduced substantially, and the effective production time is long and the recovery efficiency is high. Moreover, due to the horizontal tractive effort of a cosolvent cavity of the horizontal flank, a large amount of air expands toward the flank following the combustion zone, and therefore the safety risk that the air penetrates into the production well bottom directly is lowered.

Description

technical field [0001] The invention relates to a method for recovering an oil reservoir by solvent-assisted fire flooding and gravity drainage. Background technique [0002] The Toe-to Heel Air Injection (THAI) technology is a patented technology of Petrobank, Canada. Its technical principle is to deploy a horizontal production well and a vertical injection well in the same vertical section of the same oil layer. The horizontal section of the production well is located at the bottom of the oil layer, 1 to 2 meters away from the bottom of the oil layer. The vertical injection well is located vertically above the toe of the horizontal section of the horizontal production well, and the bottom of the vertical injection well is 5 to 7 meters away from the toe of the horizontal section of the horizontal production well. rice. During the production process of fire flooding, the vertical injection well and the horizontal production well first adopt steam stimulation or downhole el...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B43/16E21B43/24E21B43/243E21B43/22
Inventor 吴永彬赵欣
Owner PETROCHINA CO LTD
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