Horizontal well integrated acidification method considering permeability spatio-temporal evolution law

By accurately calculating the injection volume of drilling fluid and acid, and simulating the permeability changes in horizontal well sections, the problem of non-uniform contamination in horizontal well sections in existing technologies has been solved, achieving uniform acidizing stimulation of horizontal well sections and improving the quality of oil and gas development.

CN120946299AActive Publication Date: 2025-11-14SOUTHWEST PETROLEUM UNIV
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Patent Information

Application Number
CN202511080497.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-04
Publication Date
2025-11-14
Estimated Expiration
2045-08-04

AI Technical Summary

Technical Problem

Existing horizontal well drilling fluid contamination models fail to accurately consider the spatiotemporal evolution of permeability, resulting in poor acidizing effects and making it difficult to make a horizontal comparison between the drilling fluid injection volume in the horizontal well section and the acid injection volume after temporary plugging and acidizing, thus failing to effectively improve non-uniform contamination.

Method used

By collecting formation data, dividing the wellbore, formation, and time units, calculating the drilling fluid invasion radius and skin factor, simulating acid flow, and combining the skin factor of the temporary plugging agent filter cake, the flow rate and injection pressure are calculated, enabling precise control of the drilling fluid and acid injection volume and simulating the formation flow distribution at different times.

Benefits of technology

It improved the accuracy and quality of acidizing operations, achieved uniform acidizing of horizontal well sections, reduced acid waste, and improved the effectiveness of oil and gas development.

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Abstract

A horizontal well integrated acidification method considering a permeability spatio-temporal evolution law relates to the technical field of oil and gas development, and comprises the following steps: collecting stratum data of a target horizontal well area, and dividing a target horizontal well into a shaft unit, a stratum unit and a time unit; calculating the equivalent ellipse invasion radius and the equivalent shaft radius of the drilling fluid in each formation unit, the permeability of the formation invasion area after the drilling fluid is injected, the local skin factor, the comprehensive skin factor and the temporary plugging agent filter cake skin factor of each formation unit and the permeability of the formation at any moment in sequence; the flow of any stratum unit at any moment after drilling fluid injection and temporary plugging acidification is calculated, and the drilling fluid injection amount and the acid fluid injection amount of the stratum unit within the specific time range are obtained; according to the method, the difference of the permeability damage zones of the horizontal well is considered, on the basis of determining the specific pollution condition of the drilling fluid to the horizontal section stratum, a better result of implementing the acidification operation is obtained, and the quality of the acidification operation is fully improved.
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