Method for improving late development effect of heavy oil steam huff and puff

A technology of development effect and steam, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low recovery rate, achieve improved recovery rate, expand steam swept volume, and improve steam utilization rate Effect

Inactive Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for improving the late development effect of heavy oil steam

Method used

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  • Method for improving late development effect of heavy oil steam huff and puff
  • Method for improving late development effect of heavy oil steam huff and puff
  • Method for improving late development effect of heavy oil steam huff and puff

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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, 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.

[0023] 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 improving the late development effect of heavy oil steam huff and puff. The method comprises the steps of screening matched high-temperature resistant foaming agents through static and dynamic evaluation; determining injection parameters and injection modes of the high-temperature resistant foaming agents, and injecting the high-temperature resistant foaming agents into a well; determining the proportion and solution temperature of urea and an aqueous solution so as to form an aqueous urea solution, injecting the aqueous urea solution into the well, and injecting steam first so as to preheat a stratum before the aqueous urea solution is injected; injecting steam into the well so as to increase the steam dryness and the quantity of steam; determining thesoak time according to the wellhead temperature of the well; opening the well, continuously producing until the oil-steam ratio reaches the economic limit 0.1, and stopping producing. According to themethod, the problem of low recovery efficiency of the later period of heavy oil reservoir exploitation in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for improving the late-stage development effect of steam huff and puff of heavy oil. Background technique [0002] Steam huff and puff is currently the main development method for heavy oil reservoirs, but heavy oil reservoirs have strong heterogeneity, serious steam overlay, and uneven production of oil layers. Especially in the late stage of steam huff and puff, the steam mainly migrates ineffectively along the dominant channel, resulting in serious steam waste, the steam swept volume is small, the middle and lower parts of the oil layer cannot be produced, and the oil recovery factor is low. [0003] It can be seen that the production methods in the prior art cannot satisfy the effective recovery of heavy oil reservoirs in the later stage, so that the recovery of heavy oil reservoirs has a problem of low recovery in the later stage. Contents of the in...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/16E21B43/22
CPCE21B43/16E21B43/164E21B43/24
Inventor 于庆森杨智木合塔尔董宏陈燕辉杨柳刘刚胡元伟向娟余书漫颜永何
Owner PETROCHINA CO LTD
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