Method and device for predicting position of front edge of fireflood

A fire-flooding front and production well technology, which is applied in measurement, earthwork drilling, data processing applications, etc., can solve the problems of uneven vertical production without consideration of multi-layer fire flooding, great difficulty, and uneven vertical production.

CN109162686AActive Publication Date: 2019-01-08CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-01-08

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Abstract

The embodiment of the invention, which belongs to the technical field of petroleum development, provides a method and device for predicting the position of the front edge of a fireflood. The method comprises the following step: determining propulsion distances of a fireflood edge of each of a plurality of oil layers along all producing well directions according to distribution angles of a centralgas injection well in a target well group along all production well directions, the thickness of each of a plurality of oil layers of a target reservoir, an air amount consumed by combustion of the unit volume of oil layer, gas absorption percentages of all oil layers, accumulative injection rates of the central gas injection well along all production well directions within a certain period of time and stratum air retention rates between the central gas injection well and all production wells. Therefore, the propulsion distance of the fireflood front edge of each of the plurality of oil layersis predicted and thus the basis is provided for adjusting the injection-production parameters of the multi-layer fireflood during the production process.
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Description

technical field

[0001] The invention relates to the technical field of petroleum development, in particular to a method and device for predicting the position of a fire flooding front. Background technique

[0002] Burning oil layer, also known as fire flooding, is a thermal recovery technology to improve the recovery rate of heavy oil reservoirs. It continuously injects air into the oil layer and ignites the oil layer, uses the coke-like substances generated during the pyrolysis reaction as fuel, uses the heat generated by combustion to improve the fluidity of the underlying crude oil, and generates carbon dioxide and nitrogen to form flue gas flooding. Push crude oil to production wells. During the stable combustion process of the oil layer, the combustion zone advances radially to form a fire line (the fire line is the position of the front edge of the fire drive).

[0003] Due to the complex combustion reaction of fire flooding and the influence of formation heterogene...

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Embodiment Construction

[0038] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0039] figure 1 It is a flowchart of a method for predicting the position of a fire front provided by an embodiment of the present invention. Such as figure 1 As shown, the method may include the following steps.

[0040] In step S1, the distribution angle along the direction of each production well according to the central gas injection well in the target well group is obtained.

[0041] Wherein, the distribution angle of the central gas injector in the target well group along the direction of each production well refers to the interval formed by the midpoint of the distance b...