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Method for exploiting thick-layer heavy oil reservoir by in situ combustion assisted gravity drainage

A technology for assisting gravity and burning oil layers, applied in the fields of fluid production, earthwork drilling, isolation devices, etc., can solve problems such as difficulty in improving the ultimate recovery of crude oil, and achieve the effect of reducing gas channeling and increasing crude oil production

Inactive Publication Date: 2012-03-28
联合石油天然气(盘锦)有限公司
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Problems solved by technology

It overcomes the shortcomings that the existing methods are difficult to improve the ultimate recovery of crude oil for thick heavy oil reservoirs and some heavy oil reservoirs with steam huff and puff and the gasoline ratio is close to the economic limit

Method used

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Embodiment Construction

[0006] A method for exploiting thick heavy oil reservoirs by burning oil layers with assisted gravity drainage. The steps of the method are as follows: firstly, under the condition of not changing the original well pattern, the perforated section in the middle and upper part of the production well is sprayed with cement slurry Or seal with a packer, reserve about 10 meters of perforated well section for oil drainage in the lower part of the oil layer; keep about 10 meters of the upper part of the perforated well section of the air injection well and fire well as the air injection channel, and the lower formation Seal with cement or packer to form a drop of more than 30 meters in the reserved perforated section of the air injection well than the reserved perforated section of the surrounding production oil well, thus forming a combustion oil layer assisted gravity drainage oil production well pattern; Formation preheating or electric heater method heats the air injected into the...

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Abstract

The invention relates to the technical field of heavy oil thermal recovery, especially a method for exploiting thick-layer heavy oil reservoir by in situ combustion assisted gravity drainage. The method comprises the following steps: firstly, under condition that the existing well network is not exchanged, sealing the penetrated perforation in the middle-upper part of the production well by cement slurry or packer; setting aside a 10-meter perforation segment for releasing oil in the lower part of the oil layer; keeping 10 meters of the upper parts of the air injecting well and the combustion perforation, sealing the lower ground layer by cement or packer, so as to form the in situ combustion assisted gravity drainage well network; heating the air in the air injecting well to higher than the threshold temperature of the high-temperature oxidation reaction of the crude oil by formation preheating or electric heater; according to the designing requirement, continuously injecting the air into the formation, so that the crude oil can flow outside from the lower perforation oil discharging channel of the production well; the crude oil is lifted to ground by using a lifting device. The invention realizes small limit on reservoir depth, the gas channeling is reduced and the crude oil output is increased.

Description

Technical field: [0001] The invention relates to the technical field of thermal exploitation of heavy oil, in particular to a method for exploiting thick heavy oil reservoirs by burning oil layers and assisting gravity drainage. Background technique: [0002] At present, for research on thick heavy oil reservoirs, the conventional method of burning oil layers and the THAI method of burning oil layers with vertical wells and horizontal wells are generally used. The THAI method of burning oil layers with vertical wells and horizontal wells is suitable for unproduced oil reservoirs. The heavy oil reservoirs in all layers are in the middle and late stages of development, and it is no longer economical to drill horizontal wells for development. At present, a representative Chinese patent (CN201010154476) discloses a method for improving the recovery of thick massive heavy oil by using staged fire flooding. For oil layers larger than 10 meters, flue gas overburden will inevitably...

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Application Information

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IPC IPC(8): E21B43/243E21B33/10E21B36/00E21B36/04
Inventor 王春鹏宁奎张弘韬
Owner 联合石油天然气(盘锦)有限公司
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