Method and device for obtaining threshold pressure gradient of tight sandstone gas reservoir

By establishing a relationship model of experimental threshold pressure gradient, permeability and water saturation of dense sandstone gas reservoirs, and using gas reservoir engineering methods to correct the threshold pressure gradient in ore field, the problem of threshold pressure gradient determination error in tight sandstone gas reservoirs is solved, and the accuracy of analysis and calculation is improved.

CN114961710BActive Publication Date: 2025-03-25PETROCHINA CO LTD
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Patent Information

Application Number
CN202110202349.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-02-23
Publication Date
2025-03-25
Estimated Expiration
2041-02-23

AI Technical Summary

Technical Problem

Due to the existence of pore water in tight sandstone gas reservoirs, the threshold pressure gradient of the gas during seepage is reduced, which reduces the single well control reserve and gas reservoir recovery rate. There is an error in the threshold pressure gradient measured by physical simulation experiments, which affects the accuracy of mine analysis and calculation.

Method used

By obtaining multiple experimental threshold pressure gradients under different reservoir physical conditions of tight sandstone, a relationship model of experimental threshold pressure gradient, permeability and water saturation is established, and the experimental threshold pressure gradient is converted into a mine site threshold pressure gradient by gas reservoir engineering method, and the threshold pressure gradient value measured by the experiment is corrected.

Benefits of technology

The accuracy of mine analysis and calculation has been improved, the problem of experimentally measuring the threshold pressure gradient value is overcome, and the understanding and prediction ability of the threshold pressure gradient of tight sandstone gas reservoirs has been enhanced.

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Abstract

The present application discloses a method and device for obtaining a mine threshold pressure gradient of a tight sandstone gas reservoir, and belongs to the field of oil and gas field development engineering. The method first obtains multiple experimental threshold pressure gradients under different reservoir physical property conditions of tight sandstone; based on the relationship between a part of the multiple experimental threshold pressure gradients and different reservoir physical property conditions, a relationship model between the experimental threshold pressure gradient, permeability and water saturation is obtained; the reliability of the relationship model is verified by another part of the multiple experimental threshold pressure gradients; based on the reliable relationship model and the actual permeability and water saturation of the mine, the mine threshold pressure gradient is obtained. The method establishes a relationship model between the experimental threshold pressure gradient, permeability and water saturation through physical simulation experiments, and then converts the experimental threshold pressure gradient into a mine threshold pressure gradient, which can obtain a more accurate actual threshold pressure gradient of the mine to guide the single well production allocation of this type of gas reservoir.
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