Method for increasing oil extraction speed by using vertical well to assist in SAGD capacity expansion of original oil reservoir

A primitive, oil-reservoir technology, applied in the fields of fluid production, earth-moving, wellbore/well components, etc., can solve problems such as low oil production rate, and achieve increased oil production rate, shortened cycle warm-up time, and accelerated cycle warm-up speed. Effect

Active Publication Date: 2021-06-22
PETROCHINA CO LTD
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for increasing the oil recovery rate by using vertical wells to assist the expansion of original reservoir SAGD, so as to solve the problem of low oil recovery rate in the prior art

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  • Method for increasing oil extraction speed by using vertical well to assist in SAGD capacity expansion of original oil reservoir
  • Method for increasing oil extraction speed by using vertical well to assist in SAGD capacity expansion of original oil reservoir
  • Method for increasing oil extraction speed by using vertical well to assist in SAGD capacity expansion of original oil reservoir

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[0025] 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.

[0026] 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.

[0027] 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 method for increasing the oil extraction speed by using a vertical well to assist in SAGD capacity expansion of an original oil reservoir. The method comprises the steps that the SAGD original oil reservoir suitable for vertical well assisted capacity expansion is determined; two horizontal wells which are vertically opposite are drilled in the oil reservoir, wherein the upper horizontal well is a steam injection well, and the lower horizontal well is a production well; the vertical well is drilled; the steam injection well and the production well are washed under pressure; stimulants are injected into the steam injection well and the production well at the same time; the injection amount of the stimulants is adjusted until the steam injection well communicates with the production well; the production well is closed, the stimulants are injected into the steam injection well, and meanwhile the stimulants are injected into the vertical well; the horizontal wells are circularly preheated, and SAGD production is conducted; huff-puff injection and production are conducted on the vertical well, and huff-puff injection and production parameters of the vertical well are adjusted till steam cavities between the vertical well and the horizontal wells are in communication; and the vertical well is switched to be subjected to continuous steam injection, and the horizontal wells keep continuous production. The problem that in the prior art, the oil extraction speed of heavy oil reservoir exploitation is low is solved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for increasing the oil recovery rate by using a vertical well to assist SAGD expansion of an original oil reservoir. Background technique [0002] SAGD technology, steam-assisted gravity drainage technology, has been successfully applied in the field of heavy oil reservoir development. 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. The steam chamber continues to expand, and heat exchange occurs with crude oil in the oil layer. Crude oil and steam condensate flow downward by gravity and are produced from horizontal producing horizontal wells in the lower part of the reservoir. Under this injection-production method, crude oil mainly drains by gravity. When it encounters...

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Application Information

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IPC IPC(8): E21B43/24E21B47/07E21B47/06E21B47/00
CPCE21B43/24E21B47/06E21B47/00
Inventor 孙新革孟祥兵罗池辉
Owner PETROCHINA CO LTD
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