Strapping inertial navigation gyroscope clinometer based on MEMS device

Abstract

The invention discloses a strapdown inertance navigation gyro inclinometer based on an MEMS device, comprising a ground module and an underground measurement module. A ground system is composed of a microcomputer and a control unit, and the underground measurement comprises an exploration head of an inertance navigation system based on an MEMS device, related electronic components and a communication component. In the invention, in drilling process, the rotary angle along three axial directions of the inclinometer is obtained by integrating the instantaneous angular frequency of the inclinometer, thereby being capable of realizing measurement while drilling and outputting azimuth information of an oil well in real time. Meanwhile, in order to eliminate noise interference and random drift of gyro, Kalman filtering method is used for processing input data. In deviational survey process, just one movement of an instrument from the well mouth to the well bottom and then to the well mouth is needed, thereby being capable of obtaining complete information of the oil well. The device has the advantages of small volume, low cost, high precision, quick speed measurement, continuous measurement, high reliability and broad application range.

Description

technical field [0001] The invention belongs to the field of inertial measurement for oil fields, exploration and drilling, and relates to a strapdown inertial navigation gyro inclinometer based on MEMS (micro-electro-mechanical system) devices. Background technique [0002] At present, the inclinometers used in oil drilling construction are mainly fluxgate inclinometers. It uses a three-axis orthogonal accelerometer to measure the earth's gravity vector and a three-axis orthogonal fluxgate to measure the earth's magnetic field vector. Although the sensor performance of this measurement method is stable and reliable, it is required that there should not be any ferromagnetic substances within 5 meters around the fluxgate. Since the old well has casing, it cannot provide a good non-magnetic environment for the instrument, so it is impossible to measure the borehole trajectory of the old well by using the fluxgate. In this case, stable and reliable measurements can be made by...

AI Technical Summary

Problems solved by technology

Compared with other gyroscopes, MEMS gyroscopes have great advantages in terms of volume, cost, power consumption and impact resistance, but due to their low accuracy in the early stage, they have not attracted much attention

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