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Perforation method and perforation structure of steam huff and puff heavy oil reservoir

A pore structure and oil layer technology, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of uneven vertical production of oil layers, affecting reservoir development effects, etc.

Active Publication Date: 2021-01-29
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The direct result of this steam overlay is that the upper part of the oil layer is injected with more steam than the lower part, and the long-term huff and puff results in uneven vertical production of the oil layer, which affects the overall development effect of the reservoir.

Method used

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  • Perforation method and perforation structure of steam huff and puff heavy oil reservoir
  • Perforation method and perforation structure of steam huff and puff heavy oil reservoir
  • Perforation method and perforation structure of steam huff and puff heavy oil reservoir

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Embodiment Construction

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.

[0035] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements ...

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Abstract

The embodiment of the present application discloses a perforation method and a perforation structure for a steam huff and puff heavy oil layer, including the following steps: acquiring geological information near a target oil layer; and determining perforation information according to the geological information. The geological information indicates whether there is a water layer above and below the target oil layer. The step of "determining perforation information based on the geological information" includes: when there is no water layer above and below the target oil layer, obtaining the thickness span of the entire target oil layer; when the thickness span of all target oil layers is greater than a preset value, Perforating each target oil layer above the first preset position with a first perforation density; perforating each target oil layer below the first preset position with a second perforation density, wherein the first perforation density is less than the first perforation density Two perforation density. The oil layer perforation combination structure and method are of great significance to the enhanced recovery of heavy oil reservoirs.

Description

technical field [0001] The present application relates to the field of petroleum acquisition, in particular, to a perforation method and a perforation structure for steam huff and puff heavy oil reservoirs. Background technique [0002] At present, heavy oil reservoirs are mostly exploited by steam huffing and puffing, because during the steam injection process, the steam will have the characteristics of overlapping, that is, when the injected steam heats the oil reservoir, the steam and condensate will separate due to gravity, and the vapor-liquid A phenomenon that produces flow velocity differences on the oil layer section. The direct result of this steam overlay is that the upper part of the oil layer is injected with more steam than the lower part, and the long-term huff and puff results in uneven vertical production of the oil layer, which affects the overall development effect of the reservoir. Contents of the invention [0003] In the embodiment of the present appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/11E21B43/24E21B49/00
CPCE21B43/11E21B43/24E21B49/00
Inventor 杨晓强周旭刘影孙作海段强国高一云谢建波李楠楠王秀菊金来宝
Owner PETROCHINA CO LTD
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