Vertical well assisted lateral expansion oil extraction method after SAGD development

An auxiliary side and oil reservoir technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as slow oil production speed, and achieve the effect of improving oil production speed and accelerating thermal communication.

Inactive Publication Date: 2021-05-04
PETROCHINA CO LTD
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method of using vertical wells to assist lateral expansion of oil production after AGD development, so as to solve the problem of slow oil recovery after lateral expansion of oil layers in the prior art

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  • Vertical well assisted lateral expansion oil extraction method after SAGD development

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Embodiment Construction

[0020] 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.

[0021] 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.

[0022] In the present invention, unless stated otherwise, the used orientation words such as "upper, lower, top, bottom" are usually for the directions shown in the drawings, or for the parts themselves in the vertical, In terms of vertical or gravitational direction; similarly, for the convenience of understanding and description, "inner and outer" refer to the inner and outer relative to the outline of each component itself, but the above orientation words ...

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Abstract

The invention provides a vertical well assisted lateral expansion oil extraction method after SAGD development. The vertical well assisted lateral expansion oil extraction method after SAGD development comprises the steps that an available oil reservoir is determined; steam injection of a steam injection horizontal well of the available oil reservoir is stopped, continuous production of a production horizontal well of the available oil reservoir is kept, and the pressure of an SAGD steam cavity of the available oil reservoir is reduced; a vertical well is arranged close to the steam injection horizontal well; a stimulant is injected into the vertical well, and when the bottom hole pressure of the vertical well is larger than the minimum principal stress of a stratum, the inner side wall of the vertical well is expanded; huff and puff production is conducted on the vertical well; the vertical well communicates with the SAGD steam cavity; and vertical well oil is converted into continuous steam injection from huff and puff production, and continuous production of the available oil reservoir is kept. The problem that in the prior art, the oil extraction speed is low after lateral expansion is conducted on an oil layer is solved.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a method for oil recovery by using vertical wells to assist lateral expansion after SAGD development. Background technique [0002] SAGD technology, that is, steam-assisted gravity drainage technology was invented by Professor Butter of Canada in 1978, and has been successfully applied in heavy oil reservoirs in Canada's oil sands mining area, my country's Liaohe Oilfield, Xinjiang Oilfield and other places. The main principle of dual-horizontal-well SAGD is to deploy two vertically parallel horizontal wells at the bottom of the oil layer, and continuously inject steam from the upper horizontal well into the oil layer to heat the oil layer and crude oil. Viscous crude oil and steam condensate flow down by gravity and are produced from horizontal producing horizontal wells in the lower part of the reservoir. However, under this injection-production method, the crude oil is mainly ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/24E21B43/305
Inventor 孙新革孟祥兵罗池辉
Owner PETROCHINA CO LTD
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