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Bottom water reservoir water cone quantitative characterization method

A technology for quantitative characterization of bottom water reservoirs, applied in surveying, earthmoving, wellbore/well components, etc., to solve problems such as inaccurate distribution of remaining oil

Pending Publication Date: 2021-04-16
PETROCHINA CO LTD
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  • Claims
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Problems solved by technology

At present, there is no special method to quantitatively characterize the water cone in bottom water reservoirs, resulting in inaccurate judgments on the water-out situation around the water cone and the distribution of remaining oil

Method used

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  • Bottom water reservoir water cone quantitative characterization method
  • Bottom water reservoir water cone quantitative characterization method
  • Bottom water reservoir water cone quantitative characterization method

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Embodiment Construction

[0043] 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.

[0044] Such as figure 1 As shown, the water cone quantitative characterization method of the bottom water reservoir provided by the embodiment of the present invention includes the following steps:

[0045] Step S101, fitting the experimental data to obtain the threshold pressure gradient expression of the bottom water reservoir water cone;

[0046] In this embodiment, the expression of the starting pressure gradient fitted by the experimental data is:

[0047]

[0048] Among them, λ is the threshold pressure gradient, K is the reservoir permeability, μ o is the viscosity of...

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Abstract

The invention relates to the technical field of bottom water reservoir development, and provides a bottom water reservoir water cone quantitative characterization method. The method comprises the following steps: fitting experimental data to obtain a starting pressure gradient expression of a water cone of a bottom water reservoir; establishing an oil reservoir flow velocity expression according to the starting pressure gradient expression; establishing a water cone height expression of the bottom water reservoir according to a statics principle and the oil reservoir flow velocity expression; and representing the water cone height of the bottom water reservoir by adopting the water cone height expression. According to the technical scheme, quantitative characterization can be accurately performed on the water cone of the bottom water reservoir, so that the water logging condition of the periphery of the water cone and the distribution condition of the remaining oil are accurately judged, and excavation of the remaining oil is accurately guided.

Description

technical field [0001] The invention relates to the technical field of bottom water reservoir development, in particular to a quantitative characterization method for bottom water reservoir water cones. Background technique [0002] During the development of bottom water reservoirs, bottom water coning will lead to a rapid rise in water cut in production wells and a significant decrease in oil production, which in turn will cause water flooding, reducing the recovery rate and development effect of the reservoir, while the water cone In addition, there is a large amount of remaining oil distribution. In order to judge the surrounding water flooding and remaining oil distribution after the water cone is formed, it is necessary to describe the water cone quantitatively, so as to guide the remaining oil in the later stage. At present, there is no special method to quantitatively characterize the water cone in bottom-water reservoirs, resulting in inaccurate judgments on the wate...

Claims

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Application Information

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IPC IPC(8): E21B47/00
Inventor 王庆魁李云鹏马瑞季岭郭小龙周莹刘阳李新民姜家营
Owner PETROCHINA CO LTD
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