Well drilling method sinking ultrasonic measurement instrument

Abstract

The invention discloses an ultrasonic meter for shaft sinking by boring, which comprises a downhole tool subsystem, a subsystem above the shaft, a computer subsystem, a depth instrument subsystem, a winch subsystem and an oscillograph subsystem. The invention is characterized in that: a conversion transducer is provided with a constant pressure casing; liquid medium is stored in the constant pressure casing; the conversion transducer is arranged in the liquid medium; the constant pressure casing is made of nylon polyester; the characteristic of the liquid medium is coupled with the material and structure of the constant pressure casing. The invention can form a liquid medium environment in a constant state around the proximity of the transducer. No matter how deep the downhole tool in the meter is lowered under the ground, the transducer can touch the liquid medium which keeps constant all along. Accordingly, the pressure of the conversion transducer is kept constant, and is not changed with difference of the mud specific gravity and pressure of different measuring depths. In this way, the stability and the reliability are significantly improved.

Description

technical field [0001] The invention relates to an ultrasonic measuring device used for measuring the inclination and diameter width of the well diameter or aperture during the drilling of small well diameter or pile foundation. Background technique [0002] In the prior art, the measurement of the diameter of small-diameter drilling is mostly carried out by simple manual means, which is cumbersome to operate and poor in accuracy. In addition, Chinese invention patent application CN1804371A discloses a pile foundation borehole diameter measuring instrument, which is suitable for measuring smaller diameters or pile hole diameters, and can provide technical parameters such as well wall inclination, well (hole) diameter, etc. ) construction provides effective technical guarantee. The technical composition of the pile foundation borehole diameter measuring instrument mainly includes: downhole instruments used to transmit ultrasonic pulse signals, receive the reflected ultrasoni...

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Problems solved by technology

However, in production practice, it is also found that it has the following deficiencies: First, the surrounding of the rotary transducer in the downhole instrumentation subsystem is designed for conventional exposure. The medium environment is also constantly changing, so that the rotary transducer can be contacted and the medium environment in the adjacent area cannot be kept in a constant state. The actual measurement work is not particularly stable and reliable, and further work is needed in terms of stability and reliability. The second is that the power mechanism (such as a stepping motor) in the instrument cabin is connected to the transducer located under the shell through a conventional dynamic seal shaft transmission, and can drive the transducer to rotate accordingly. This conventional dynamic sealing technology makes the The downhole tool is not suitable for measuring deep pile foundation drilling, and its service life is generally short

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