Measurement-while-drilling method for near-bit dynamic hole drift angle and tool face angle

Abstract

The invention discloses a measurement-while-drilling method for a near-bit dynamic hole drift angle and a tool face angle. According to the measurement-while-drilling method for the near-bit dynamic hole drift angle and the tool face angle, an amplitude limiting filter is used for filtering out a step excitation interference signal brought by impact noise, then a UKF filter is used for filtering out most colored noise generated by vibration acceleration and magnetic interference colored noise in a three-axis fluxgate output signal, then a sliding filter is used for performing smooth filtering on a radial acceleration signal in a three-axis acceleration sensor, finally, a radial or tangential magnetic field signal of a three-axis fluxgate is taken as a reference signal, accurate extraction of a near-bit gravitational acceleration component on the basis of a cross-correlation detection method is established, and thus, dynamic real-time accurate calculation of the dynamic hole drift angle and the tool face angle of a drilling tool is realized. The problem of low dynamic measurement precision of the well-while-drilling drift angle and the tool face angle due to impact noise and centrifugal force acceleration noise which are generated when the drilling tool is operated and magnetic interference noise which exists in the fluxgate can be solved.

Description

technical field [0001] The invention is mainly used in the field of well drilling measurement, and mainly relates to a dynamic well deviation measurement method. Background technique [0002] With the increase of oil and gas resource extraction, the difficulty of resource exploration and exploitation is gradually increasing, so this puts forward higher requirements for the measurement accuracy of directional drilling trajectory. During the drilling process, the inclinometer (Measurement While Drilling) is used to measure the inclination angle, tool face angle and azimuth angle. In order to avoid the vibration interference caused by the rock breaking of the drill bit, the traditional inclinometer while drilling is installed at a distance of 10-20m from the drill bit, and the measurement of the attitude parameters of the drilling tool is realized by static measurement while drilling. Such a measurement method can reduce the influence of the vibration of the drilling tool on t...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the impact noise and centrifugal force acceleration noise generated when the drilling tool works in the above process and the magnetic interference noise of the fluxgate make the dynamic measurement accuracy of the inclination angle and the tool face angle with the drilling low, the present invention proposes a method based on UKF and correlation extraction The dynamic and accurate measurement method of the inclination angle and the tool face angle of the drilling tool based on the algorithm uses the limiting filter and the unscented Kalman filter to filter out the impact noise, vibration noise and magnetic interference in the fluxgate in most acceleration sensors. noise signal, and then use the filtered fluxgate output periodic signal as a reference signal for cross-correlation detection, extract the gravitational acceleration components in the radial and axial directions of the accelerometer, and finally calculate the inclination angle

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