A modified process for hydrocarbon recovery using in situ combustion

A hydrocarbon, oxidizing technology, used in earth-moving drilling, wellbore/well components, production fluids, etc., which can solve the problems of increasing the environment, "footprint impact, cost increase, etc."

A hydrocarbon, oxidizing technology, used in earth-moving drilling, wellbore/well components, production fluids, etc., which can solve the problems of increasing the environment, "footprint impact, cost increase, etc."

CN102137986AInactive Publication Date: 2011-07-27ARCHON TECH LTD
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  • A modified process for hydrocarbon recovery using in situ combustion
  • A modified process for hydrocarbon recovery using in situ combustion
  • A modified process for hydrocarbon recovery using in situ combustion

Examples

Experimental program
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Effect test

Embodiment Construction

[0056] Figure 1A A translucent schematic diagram showing the layout of wells used in the prior art for in situ recovery of hydrocarbons from an underground hydrocarbon reservoir or formation 10 .

[0057] in particular, Figure 1A Schematically depicts a prior art method for on-site recovery of hydrocarbons disclosed in U.S. Patent No. 5,626,191, the prior art method comprising providing a series of production wells 12, each production well 12 comprising a substantially vertical section 14 and a substantially horizontal Leg 16 , substantially horizontal Leg 16 has a “toe” portion 18 and a “heel” portion 20 . Horizontal legs 16 of production wells 12 are located in the lower region of hydrocarbon formation 10 and are substantially porous to allow ingress of fluids. A series of injection wells 22 are provided that are located near the "toe" region and extend down into the formation 10 with perforations in the upper region of the oil-bearing reservoir.

[0058] Figure 1B show...

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Abstract

The present invention provides a modified method of in situ recovery of hydrocarbon from an underground hydrocarbon-containing formation. An ''L'' shaped production well, having a vertical upper section, and a lower horizontally-extending leg which is positioned low in the hydrocarbon formation, is provided. The horizontal leg connects to the vertical section of the production well at a heel portion and has a toe portion at an opposite end thereof. An oxidizing gas is injected into the formation proximate the vertical section of the production well. A vertical combustion front is created which is caused to sweep outwardly therefrom and laterally within the formation above the horizontal leg, from the heel to the toe of the horizontal leg, causing hydrocarbons in the formation above the horizontal leg to be upgraded and liquify, and thereafter to drain downwardly into the horizontal leg which is permeable, where such liquified hydrocarbons are then delivered to surface via production tubing. A non-oxidizing gas is injected into the heel portion of the horizontal leg via injection tubing contained within the vertical section of the production well. Benefits of the modified method of in situ recovery include decreased costs and lessened environmental impact.

Description

technical field [0001] The present invention relates to an improved method for the recovery of hydrocarbons from subterranean reservoirs by in situ combustion using horizontal production wells. Background technique [0002] U.S. Patent 5,626,191 issued May 6, 1997 (hereinafter the '191 patent) discloses an in situ combustion method for producing hydrocarbons from subterranean hydrocarbon reservoirs utilizing (i) at least one injection well located relatively high in the reservoir for injecting oxidizing gas into the hydrocarbon formation, and (ii) for the production of liquefied or gasified hydrocarbons from the hydrocarbon reservoir well. The production well has a vertical section that communicates with a horizontal leg that extends generally perpendicularly outward from the vertical section and has a "toe" portion and a "heel" portion. The horizontal branch terminates relatively low in the reservoir and communicates with the vertical section at its "heel". Air or other ...

Claims

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Application Information

Patent Timeline
27 Jul 2011
Publication
CN102137986A
IPC
E21B43/243
CPC
E21B43/243; E21B43/305
Inventors
康芮·爱亚沙; 吴心洁