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sagd oil recovery method

A technology of oil layer and recovery-injection ratio, applied in the field of SAGD oil recovery, can solve the problems of low oil recovery efficiency, and achieve the effect of improving recovery rate, increasing oil recovery rate and recovery rate

Active Publication Date: 2022-08-05
PETROCHINA CO LTD
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  • 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 kind of SAGD oil recovery method, to solve the problem of low oil recovery efficiency in the middle and later stages of SAGD oil recovery in the prior art

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Embodiment Construction

[0020] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[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 one of ordinary skill in the art to which this application belongs.

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

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Abstract

The present invention provides a SAGD oil collection method, including: step S1: establish a pressure difference in the two adjacent groups to form a high -pressure well group and a low -pressure well group, and maintain the normal production of the two groups; step S2 S2: After the production of the two groups of well groups is completed, the production well of the high -voltage well group is closed, and the injecting well, the low -pressure well group of the high -voltage well group, and the injector of the low -pressure well group are kept open; step S3: Adjust the well group of the well group group.Note parameters make the well group's injection balance.The present invention solves the problem of low oil collection efficiency in SAGD in the existing technology.

Description

technical field [0001] The invention relates to the technical field of oil well exploitation, in particular to a SAGD oil recovery method. Background technique [0002] SAGD technology, namely steam-assisted gravity drainage technology, is widely used in oilfield exploitation of heavy oil reservoirs. The main principle of dual-horizontal well SAGD is to deploy two horizontal wells parallel to each other at the bottom of the oil layer. From the upper horizontal well as an injection well, steam is continuously injected into the oil layer to heat the oil layer and crude oil. The steam cavity continues to expand and exchanges heat with the crude oil in the oil layer. The heated, viscosified crude oil and steam condensate flow downward by gravity and are produced from horizontally positioned production wells below the reservoir. In this injection-production method, the crude oil is mainly discharged by gravity, and the driving force for lateral expansion is weak, so it is easy t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24
CPCE21B43/2406
Inventor 罗池辉赵睿陈河青杨智高成国
Owner PETROCHINA CO LTD