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Disision method of water plugging for bottom-water oil reservoir well

A technology for bottom water reservoirs and decision-making methods, which is applied in earth-moving drilling, fluid production, wellbore/well components, etc.

Inactive Publication Date: 2005-01-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0011] The researches on prediction models of bottom water coning at home and abroad all describe the shape of water coning by establishing mathematical models, and there are no reports that use the study of water coning shape as the basis for bottom water reservoir management

Method used

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Embodiment Construction

[0023] The present invention will be specifically described below in conjunction with actual operations.

[0024] In actual operation and implementation, the inventor realizes bottom water reservoir management according to the following steps, namely:

[0025] 1. Classification of oil wells

[0026] According to the initial water content of oil wells, oil wells can be divided into three categories:

[0027] Type I oil well: the initial water cut is low (water cut less than 30%), and the production time when the water cut rises to 80% is longer than 150 days. This type of oil well is a typical bottom water reservoir development well, and it is also an oil well with the most control potential. The treatment of this type of oil well can adopt the method of establishing baffles, pressure water cones and water elimination cones.

[0028] Type II oil well: the initial water cut is between 30% and 80%, and the production time when the water cut rises to 90% is more than 100 days, ...

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Abstract

The invention provides a method work-out the bottom water cone advancing height, cone advancing radius and water cone volume according to the bottom water cone predicted model, researches the water submerging degree and residue oil latent capacity with the water cone shape, and the oil wells are classified according to the water containing rising rule, researches the change rule of the water capacity in oil; determines a bottom water treatment rule and solves flowing nine problems: 1. oil well type classification; 2. reservoir submerged degree estimation; 3. residue oil latent capacity analysis; 4. the selecting rule of bottom water treating method; 5. the selecting condition of bottom water treating well; 6. the decided rule of the isolating board in manual isolating board method; 7. creates the sifting standard and the assembly rule of blocking and sealing agent for isolating board; 8. creates the design method of the blocking agent quantity; 9. the effect estimation and the economic efficiency prediction of the bottom water treatment.

Description

Technical field: [0001] The invention relates to a decision-making method for oilfield profile control and water shutoff, namely a decision-making method for water shutoff in reservoirs with bottom water, which provides an effective decision-making method for formulating and implementing the development plan of oilfields with bottom water. Background technique: [0002] The most common phenomenon in bottom water reservoirs is bottom water coning. Bottom water coning means that in a reservoir with bottom water, before the reservoir is exploited, the water is located in the lower part of the reservoir and the oil is located in the upper part of the reservoir. If a production well is drilled in the oil-bearing part for oil production, a hemispherical potential distribution will be formed under the open section, and due to the influence of the vertical phase potential gradient, the oil-water contact surface will be deformed, and the potential gradient along the well axis will rea...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B43/00
Inventor 张贵才殷艳玲葛际江孙铭勤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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