Tight oil fracturing effect evaluation method, system and equipment based on fracturing fluid flowback data and storage medium

By using fracturing fluid reflux data to calculate the normalized liquid volume and draw the flow state diagnostic curve, combined with actual working conditions analysis, the problem of insufficient accuracy of hydraulic fracture parameters in the prior art is solved, and the accuracy of fracturing effect evaluation is improved.

CN119720463AActive Publication Date: 2025-03-28PETROCHINA CO LTD
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Patent Information

Application Number
CN202311268207.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-27
Publication Date
2025-03-28
Estimated Expiration
2043-09-27

AI Technical Summary

Technical Problem

The prior art is difficult to accurately use fracturing fluid reflux data to invert hydraulic fracture parameters, and fail to effectively consider the impact of actual working conditions on fracturing effect, resulting in insufficient accuracy of evaluation results.

Method used

By obtaining the bottom-hole pressure and liquid discharge data during the re-discharge period, the normalized daily liquid production volume and normalized cumulative liquid production volume are calculated, the flow state diagnostic curve is drawn, the effective crack volume is identified, and when there is a sand or drilling condition, the double logarithmic curve of standardized pressure and material equilibrium time is analyzed, comprehensively considering the impact of the actual working condition on the effective crack volume.

Benefits of technology

The accuracy of fracturing effect evaluation is improved, the hydraulic fracture parameters can be inverted more accurately, and the actual working conditions are taken into account, and more reliable fracturing effect evaluation results are provided.

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Abstract

The invention provides a tight oil fracturing effect evaluation method, system and equipment based on fracturing fluid flow-back data and a storage medium. According to the method, a flow-back flow state diagnostic curve of a fractured horizontal well is obtained through calculation with an unstable well testing theoretical method, and the effective fracture volume is calculated with the combination of a linear analysis method; real working condition information such as fracturing well completion, sand production and drilling plug is synthesized, the effective crack volume is comprehensively evaluated, and the accuracy of the evaluation result is higher. The fracturing effect evaluation method disclosed by the invention is obtained on the basis of a large amount of theoretical analysis and fitting operation verification, and results are reliable through micro-seismic monitoring and long-term production data verification of instance wells in Malake areas in Xinjiang; the data utilization rate is high, the method is economical and easy to obtain, the fracturing effect can be evaluated conveniently and rapidly, and fracturing parameter optimization is guided.
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