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Heavy oil production method

A production method and heavy oil technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of low recovery rate of reverse nine-point well pattern

Active Publication Date: 2020-07-21
PETROCHINA CO LTD
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a heavy oil recovery method to solve the problem of low recovery of reverse nine-point well pattern in the prior art

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Embodiment Construction

[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0025] In the present invention, in the absence of a contrary statement, the used orientation words such as "up and down" usually refer to the direction shown in the drawings, or refer to the vertical, vertical or gravity direction Similarly, for the convenience of understanding and description, "left and right" usually refer to the left and right shown in the drawings; The words are not used to limit the invention.

[0026] In order to solve the problem of...

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Abstract

The invention provides a heavy oil production method. The heavy oil production method is suitable for an inverted nine-spot pattern, and the inverted nine-spot pattern comprises at least one well spacing unit. Each well spacing unit comprises a first straight well, a second straight well and a third straight well, wherein the first straight well communicates with a gas supply device, and the second straight well and the third straight well are connected with an oil production device. The heavy oil production method comprises the steps that S1, communication between the first straight well andthe gas supply device is switched off so that the first straight well can be connected with the oil production device; S2, the second straight well is disconnected with the oil production device, andin the direction from the oil top to the oil bottom of an oil reservoir, perforations of a preset length h of the second straight well are plugged; and S3, the gas supply device communicates with thesecond straight well, the gas supply device injects steam into the second straight well, the steam is discharged into the oil reservoir from the perforations of the second straight well so as to drivecrude oil in the oil reservoir into the first straight well and / or the third straight well. The heavy oil production method solves the problem that in the prior art, the recovery ratio of the inverted nine-spot pattern is low.

Description

technical field [0001] The invention relates to the technical field of oil extraction, in particular to a heavy oil extraction method. Background technique [0002] At present, steam injection thermal recovery is usually used for the recovery of heavy oil and tank heavy oil. Usually, the steam injection thermal recovery method is steam huff and puff. However, after a certain period of steam huff and puff recovery of heavy oil to form thermal communication, only the crude oil in the oil layer near each well point can be recovered, and a large amount of dead oil remains between the wells. area, resulting in a lower recovery factor. [0003] In order to enhance the recovery factor, in the existing technology, the steam flooding recovery technology is used as a successor technology for enhancing the recovery factor after steam huff and puff. Among them, steam flooding oil production is to continuously inject high-dryness steam into the oil layer from the injection well, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/24E21B43/30Y02E10/10
Inventor 董宏王倩于庆森高成果杨柳
Owner PETROCHINA CO LTD
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