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Method for improving oil extraction effect of SAGD

A development stage, horizontal well technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of low oil reservoir production efficiency

Active Publication Date: 2020-12-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for improving SAGD oil recovery effect, to solve the problem of low oil reservoir recovery efficiency in the prior art

Method used

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  • Method for improving oil extraction effect of SAGD
  • Method for improving oil extraction effect of SAGD
  • Method for improving oil extraction effect of SAGD

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Embodiment Construction

[0021] 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.

[0022] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0023] It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish simila...

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Abstract

The invention provides a method for improving the oil extraction effect of SAGD. The method comprises the steps that a vertical well is arranged above a non-development stage of a steam cavity of a horizontal well; and a dilatancy area is arranged at the non-development stage of the steam cavity, a steam inlet end opening of the dilatancy area communicates with the vertical well, and a steam outlet end opening of the dilatancy area communicates with the horizontal well, so that steam in the vertical well flows into the horizontal well through the dilatancy area, the area of a development stageof the steam cavity in the horizontal well is enlarged, and the problem that in the prior art, the oil reservoir exploitation efficiency is low is solved.

Description

technical field [0001] The invention relates to the technical field of super heavy oil reservoir exploitation, in particular to a method for improving the oil recovery effect of SAGD. Background technique [0002] At present, the production effect of dual horizontal well SAGD in the development of super heavy oil reservoirs mainly depends on the size of the steam chamber. SAGD for super heavy oil in Fengcheng has begun to be applied on a large scale. Most well groups have locally developed steam chambers, which affect the recovery of the well group. , using the vertical well assisted SAGD technology to increase the steam development point and accelerate the expansion of the steam cavity to improve the development effect. effect. The vertical well assisted SAGD technology can effectively increase the oil recovery rate by 1.5%, and the cumulative recovery rate by 8%. This effect cannot be exerted due to the influence of strong heterogeneity such as interlayers, and the degree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
CPCE21B43/2406
Inventor 桑林翔杨果姜丹张洪源李婷杨浩哲解阳波王立龙王丽于兵孙滕肖武林陈祥金鑫张家豪
Owner PETROCHINA CO LTD
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