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Extremely high water-containing period cumulative oil production and recovery rate prediction method

A technology of ultra-high water cut period and prediction method, which is applied in the field of oil reservoir development and recovery prediction, and can solve problems such as deviation and no longer suitable

Inactive Publication Date: 2016-01-06
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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Problems solved by technology

[0003] Field practice shows that this linear relationship has good adaptability in the medium-high water-cut stage of the oilfield, but with the development of the oilfield, the water cut is getting higher and higher, especially in the ultra-high water-cut stage, the actual oil-water phase-permeability ratio The semi-logarithmic relationship curve with water saturation obviously deviates from the straight line, presenting a nonlinear relationship, and the traditional formula for calculating oil displacement efficiency is no longer suitable for ultra-high water cut periods

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  • Extremely high water-containing period cumulative oil production and recovery rate prediction method

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Embodiment

[0046] The specific steps of the method for predicting cumulative oil production and recovery during the ultra-high water-cut period described in this embodiment are as follows:

[0047] (1) Carry out the oil-water relative permeability experiment in the ultra-high water cut period, collect the relative permeability experiment data, construct the relationship curve of oil-water relative permeability, and obtain a new relative permeability curve equation according to the relationship curve;

[0048] (2) According to the new phase permeability curve equation, combined with Darcy equation, B-L equation, and Welge equation, the water drive characteristic curve equation in the ultra-high water cut period is obtained, and the specific values ​​of the parameters in the water drive characteristic curve equation in the ultra-high water cut period are obtained;

[0049] (3) Introduce the limit water cut into the water drive characteristic curve equation in the ultra-high water-cut period...

specific Embodiment approach

[0053] The specific process of carrying out the oil-water phase permeability experiment in the ultra-high water-cut period is as follows: select four parallel rock samples with similar basic parameters; the basic parameters of the four rock samples are shown in Table 1 below:

[0054] Table 1 Basic parameters of the four rock samples

[0055]

[0056] The four parallel rock samples were respectively carried out the ultra-high multiple water flooding experiment with the displacement pressure gradient of 0.001-0.01MPa / cm and the displacement multiple>5000PV; including water saturation S w , and relative oil phase permeability K ro Relative permeability to water phase K rw The oil-water phase permeability ratio K ro / K rw ,As shown in table 2:

[0057] Table 2 Experimental data of relative permeability

[0058]

[0059]

[0060] Based on the experimental data in the phase permeability laboratory in Table 2, the relationship curves of oil-water relative permeability ...

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Abstract

The invention discloses an extremely high water-containing period cumulative oil production and recovery rate prediction method, which comprises the following steps: 1) carrying out an extremely high water-containing period oil-water phase permeability experiment to obtain a new phase permeability curve equation; 2) obtaining the specific numerical values of parameters in an extremely high water-containing period water-drive characteristic curve equation; 3) importing a limit moisture content, and forming an extremely high water-containing period cumulative oil production prediction equation; and 4) importing original geological reserves into the extremely high water-containing period cumulative oil production prediction equation to predict an extremely high water-containing period recovery rate. The invention provides the new extremely high water-containing period cumulative oil production and recovery rate prediction method. The new extremely high water-containing period cumulative oil production and recovery rate prediction method improves the accuracy of a reservoir engineering technology prediction aspect, can avoid errors brought to a reservoir numerical value simulation prediction result since a reservoir stratum can not be clearly seen, is simple and convenient, can predict the cumulative oil production and the recovery rate of the reservoir only by the acquisition of the basic data of reservoir rock samples, and performs an active driving function on reservoir development.

Description

technical field [0001] The invention relates to the technical field of oil reservoir development prediction recovery rate, in particular to a method for predicting cumulative oil production and recovery rate in an ultra-high water-cut period. Background technique [0002] As more and more oilfields enter the development stage of ultra-high water cut period, the research on its development law becomes more and more important. Oil displacement efficiency is the main parameter to predict oilfield ultimate recovery and evaluate oilfield development effect. Therefore, it is of great significance to study the calculation method of oil displacement efficiency in ultra-high water cut period, which can provide theoretical basis and guidance for actual oilfield production. There are three main methods for calculating oil displacement efficiency: direct calculation of oil-water relative permeability data, calculation of mine production data, and calculation of oil displacement efficien...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06
Inventor 刘浩瀚邓培林李金丹颜永勤张翔黄非难陈少云张松林李伟王家成
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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