Method, device and equipment for detecting original oil content of core drilled by oil-based drilling fluid

By collecting and analyzing the laser spectral curves of core samples and drilling fluids, a fused spectral sequence of oil-based drilling fluids was constructed for data correction. This solved the problem of low accuracy of the corrected spectral curves in existing technologies and enabled high-precision detection of the original oil content of core samples.

CN121409891BActive Publication Date: 2026-04-28DAQING OILFIELD CO LTD +1
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Patent Information

Application Number
CN202511982856.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-26
Publication Date
2026-04-28
Estimated Expiration
2045-12-26

AI Technical Summary

Technical Problem

Existing technologies, which calculate the corrected spectral curve of drilling fluid-contaminated cores by the global difference between the spectral curves of drilling fluid-contaminated cores and the spectral curves of drilling fluid samples, have low accuracy and cannot accurately evaluate the original oil content of the cores.

Method used

Laser spectrum curves of core samples contaminated with drilling fluid and laser spectrum curves of drilling fluid for each sample were collected. The oil-based interference was determined based on the laser intensity variation within the wavelength neighborhood. A fused spectral sequence of drilling fluid was constructed using fusion weights. The laser spectrum curves of the core samples were corrected. The original oil content of the core samples was detected by combining the pre-constructed equation relating peak area to crude oil component volume percentage.

Benefits of technology

By accurately identifying core contamination characteristics through local waveform similarity analysis and constructing adaptive spectral correction, the accuracy of the corrected spectral curve is improved, truly reflecting the original spectral characteristics of the core and enhancing the accuracy of detecting the original oil content of the core.

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Abstract

The present application relates to the technical field of core spectrum analysis, and particularly relates to a method, device and equipment for detecting original oil content of a core drilled by an oil-based drilling fluid, which first quantifies the wavelength-level oil-based interference degree and determines the fusion weight based on the local waveform similarity of the core and the drilling fluid spectrum, constructs a drilling fluid fusion spectrum sequence reflecting the current core contamination characteristics, and then finely corrects the core spectrum, detects the original oil content of the core according to the obtained corrected spectrum curve and the pre-constructed spectrum peak area-oil component volume percentage content relationship equation; the present application fully considers the non-homogeneity and wavelength interference difference of the drilling fluid, implements accurate denoising by constructing an adaptive background spectrum, effectively avoids the signal over-removal or residual problem caused by the traditional global difference method, makes the corrected spectrum curve after correction more truly restore the original characteristics of the core, and significantly improves the accuracy of detecting the original oil content of the contaminated core.
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