Vertical drilling deviation rectification control feedback correction method and device based on Gaussian mixture model

Abstract

The invention discloses a vertical drilling deviation rectification control feedback correction method and device based on a Gaussian mixture model. The method comprises the steps that according to a vertical drilling deviation rectification process, a track extension model of the vertical drilling deviation rectification process is constructed, the disturbance quantity of a control system is determined, and the control system is constructed; the disturbance quantity in the vertical drilling process serves as a random variable, the current disturbance quantity amplitude is evaluated according to actual drilling inclinometry data and the trajectory extension model, and in combination with historical disturbance quantity data, the disturbance quantity probability density and expectation of the disturbance quantity probability density are evaluated based on a Gaussian mixture model; and based on the expected value of the disturbance quantity, the trajectory extension model and the constraint equation are corrected and substituted into rolling optimization solution, and finally the vertical drilling deviation correction control quantity corrected by the trajectory extension model is obtained. The method has the beneficial effects that the prior information of the disturbance quantity in the deviation correction process is extracted based on the Gaussian mixture model evaluation method and is used as a feedback correction parameter, and the vertical drilling deviation correction control precision is greatly improved.

Description

technical field [0001] The invention relates to the field of vertical drilling, in particular to a Gaussian mixture model-based vertical drilling deviation correction control feedback correction method and device. Background technique [0002] Orientation correction control has always been one of the important research topics in the field of vertical drilling. The core goal of directional deviation correction control is to correct the deviated drilling trajectory through the steerable bottom hole assembly (BHA), so that the closing distance and inclination angle of the drilling trajectory can be reduced to zero as much as possible, so as to ensure the drilling The trace can extend down the plumb line. [0003] Considering the drilling cost and the limitation of drilling rigs, the steering technology commonly used in geological drilling is still dominated by sliding steering technology and fixed-point measurement technology, which will greatly increase the trajectory measure...

AI Technical Summary

Problems solved by technology

However, the feedback correction coefficient of the traditional feedback correction method is difficult to select; at the same time, the deviation between the model and the actual measurement is directly used as the feedback correction parameter, which is easy to cause the correction value to fluctuate violently with the disturbance, and is also very sensitive to sudden large disturbances; Correction control measurement is very expensive, resulting in a long feedback cycle, once the correction value is selected inappropriately, it is difficult to correct it in a short time

These problems undoubtedly increase the difficulty of correction

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