Geometric parameter measuring method for vertical shaft

Abstract

The invention discloses a geometric parameter measuring method for a vertical shaft. A reference rope method is adopted, namely an underground instrument and a reference rope are arranged on a bracket at a wellhead; the underground instrument is connected with a built-in cable winch in an instrument vehicle and a computer interface of a ground instrument and used for recording data; the reference rope tied with a heavy hammer is connected with a built-in reference rope winch in the instrument vehicle and used for adjusting lifting of the reference rope winch; and circuits are coordinated. The method comprises the following steps of: putting the underground instrument into the well at a distance of 50 centimeters from a logging instrument, lowering the reference rope vertically, obtaining the measurement result of the azimuth of the reference rope when the size of an obstacle is greater than 1/2 of the wavelength of sound wave and the sound wave is reflected, and further determining the actually measured relative azimuth; and measuring an auxiliary sound velocity, namely fixing a sound velocity by using the distance between the reference rope and the underground instrument, and calculating the distance of the actually measured azimuth. Deviation of signal initial time judgment is eliminated by introducing a logarithmic amplifying circuit in the measurement circuits, signal fluctuation caused by power frequency interference is eliminated by adopting a power frequency filter, the measurement precision of the shaft diameter reaches 1 millimeter, and the effective measurement distance in turbid water reaches 3.0 meters. The method is suitable for the water-containing vertical shaft with the depth of 0 to 1,000 meters and the diameter of 1 to 3 meters.

Description

technical field [0001] The invention relates to the ultrasonic ranging technology in the field of engineering technology, and is especially suitable for the detection of the limit value of the well deviation and the well diameter in the harsh environment, and the method provided is scientific and reasonable, fast and practical. Background technique [0002] At present, more advanced downhole directional measurement technologies include fluxgate and gyroscope, both of which have limitations; such as the requirement of the ferromagnetic environment of the fluxgate, that is, the measurement environment cannot have ferromagnetic substances; the gyroscope must be calibrated before measurement; Accurate distance measurement requires a higher frequency of the ultrasonic system; in addition, in the turbid water environment, the high-frequency ultrasonic attenuation is rapid and the fluctuation is large, and the general ultrasonic distance measurement circuit is difficult to meet the...

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Problems solved by technology

[0002] At present, more advanced downhole directional measurement technologies include fluxgate and gyroscope, both of which have limitations; such as the requirement of the ferromagnetic environment of the fluxgate, that is, the measurement environment cannot have ferromagnetic substances; the gyroscope must be calibr

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