Perforation method and structure for thickened oil layer by using steam huff and puff
A pore structure and oil layer technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of uneven vertical production of oil layers, affecting reservoir development effects, etc.
Active Publication Date: 2018-08-24
PETROCHINA CO LTD
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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.
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[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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The embodiment of the invention discloses a perforation method and structure for a thickened oil layer by using steam huff and puff. The perforation method comprises the following steps that geological information near a target oil layer is obtained; and perforation information is determined according to the geological information. The geological information indicates whether a water layer existsin the overlying and underlying of the target oil layer or not. According to the step that perforation information is determined according to the geological information, when the water layer does notexist in the overlying and the underlying the target oil layer, the thickness span of the whole target oil layer is obtained; when the thickness span of all target oil layers is larger than the pre-set value, perforating of all target oil layers above a first preset position is carried out by adopting a first perforation density; perforating of all target oil layers below the first preset positionis carried out by adopting a second perforation density, and the first perforation density is smaller than the second perforation density. The perforation combination structure and method of the oillayer are of great significance for improving oil recovery efficiency in thickened 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...
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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