Method for performing online Raman spectral analysis on drilling fluid

Abstract

The invention relates to a method for measuring all components of drilling fluid through online Raman spectra. The method comprises the following steps of: modeling by adopting an orthogonal signal to correct a partial least square stoichiometric model, and acquiring parameters which comprise coefficients, weights and loads and are pre-stored in the model; measuring and collecting Raman spectra of the drilling liquid; and establishing spectral line vectors by using the Raman spectra collected in the second step, and performing orthogonal signal correction on the spectral line vectors together with the coefficients, the weights and the loads which are acquired in the first step to acquire corrected vectors, predicated vectors and the concentration of the drilling liquid. The method for measuring all components of the drilling fluid through the online Raman spectra has the advantages of measuring on line without preprocessing the drilling liquid and extracting the drilling liquid, realizing non-contact and non-destructive measurements, shortening the analysis period, and improving the measurement sensitivity and precision, wherein the drilling liquid can be gas, liquid, emulsion, suspension or aerosol; and light hydrocarbon components, heavy hydrocarbon components and non-hydrocarbon components contained in the drilling liquid can be directly measured.

Description

technical field [0001] The present application relates to a method for online determination of the types and concentrations of various components in drilling fluid, in particular to a method for online determination of the types and concentrations of various components in drilling fluid using Raman spectroscopy. Background technique [0002] At present, the determination of drilling fluids in petroleum geological exploration sites includes the determination of the types and concentrations of gaseous components (volatile hydrocarbons, non-hydrocarbons), liquid components (heavy hydrocarbons, oil), and solid components (minerals) in drilling fluids. Obtain formation information through component analysis results, discover oil and gas shows in time, and predict engineering accidents. [0003] A component determination method in the prior art includes gas phase and liquid chromatography, which are used to measure the concentration of gas or liquid in drilling fluid. In the proc...

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Problems solved by technology

They require staff to select different sampling points and measure the samples after processing; manual operations in the analysis process will introduce new errors, thus affecting the judgment of oil and gas layers

In addition, the on-line analysis method of drilling fluid CN100460858C "On-line spectroscopic determination method of oil and gas in drilling fluid" realizes the on-line detection of drilling fluid by collecting the reflected infrared and ultraviolet fluorescence spectra of drilling fluid, and it provides a method that does not need to analyze the drilling fluid. Online detection method for pretreatment, but unfortunately it cannot measure components with no fluorescence or extremely weak fluorescence signals, such as sample gas, carbon dioxide, hydrogen, nitrogen, etc.

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