High-precision and long-distance depth detecting device and method for drill hole by adopting inertia pressure wave
A pressure wave, long-distance technology, which is applied in the field of high-precision and long-distance inertial pressure wave drilling depth sounding devices, can solve the problems of limited measurement depth of bare holes, inability to measure the depth of bare holes, and limited accuracy, and achieves the detection method. Simple and convenient effects
Active Publication Date: 2015-07-01
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
[0005] The purpose of the present invention is to provide a high-precision long-distance inertial air pressure wave drilling depth measurement device and method for the shortcomings of the existing methods for measuring the depth of boreholes, so as to solve the problem that the measurement depends on the drill pipe and cannot measure the depth of the open hole, or Open hole measurement depth is limited, precision is limited, and measurement is troublesome
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Embodiment 1
[0036] To one section closely connected, the drill pipe with a total length of 54 meters, the application of the borehole sounding method of the present invention measures the length of its internal air column, and the test data waveform is as follows: Figure 5 shown.
[0037] Figure 5 The pilot test data produced four echoes that can be distinguished by naked eyes, and the amplitude of the first echo has only a small attenuation compared with the amplitude of the excitation wave, and the fourth echo is difficult to identify. In terms of propagation length, one echo propagates 108m, and four echoes propagate 432m. Considering that there is a large energy loss when the multiple echoes turn in the direction of propagation, when using one echo to measure the borehole depth, the borehole depth that can be detected by the method of the present invention exceeds 300m steadily, fully meeting the needs of coal mines. Under favorable conditions, the detection depth may even exceed ...
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The invention discloses a high-precision and long-distance depth detecting device and method for a drill hole by adopting an inertia pressure wave. The device comprises two parts, namely, a drill hole opening blocking silica gel pad and a drill hole opening striking rubber disc, wherein the drill hole opening blocking silica gel pad comprises an opening (1), a hollow silica gel blocking ring (2), and a silica gel plate (3); the silica gel plate (3) is a square plate with certain thickness; the circular opening (1) is positioned in the center position of the silica gel (3); the annular hollow silica gel blocking ring (2) is arranged on the periphery of the opening (1); a bulge slightly higher than the plane of the silica gel plate (3) is arranged on the hollow silica gel blocking ring (2); the drill hole opening striking rubber disc is a circular cover-shaped object. The method for detecting the depth of the drill hole, provided by the invention, comprises the following steps: a drill hole opening blocked by the drill hole opening blocking silica gel pad is struck by the drill hole opening striking rubber disc to generate an inertia air pressure shock wave, and the drill hole depth can be computed through recording and treating a return wave of the inertia pressure wave. The method for detecting the drill hole depth is simple, convenient and fast, the detecting distance is long, and the precision reaching the centimeter-level is greatly superior to the detecting precision in the prior art.
Description
technical field [0001] The invention belongs to the technical field of echo ranging, and relates to a high-precision and long-distance inertial air pressure wave drilling sounding device and method. Background technique [0002] In order to control the gas in the working face in the coal mine, it is necessary to drill gas drainage boreholes; to explore and release water, it is necessary to drill water discharge boreholes. Whether the depth of drilling meets the design requirements is very critical for safe production. In addition, in the oil field, knowing the liquid level depth of the oil well is an important basis for ensuring the safe and efficient operation of the pumping unit. At this time, a fast and accurate method for measuring the depth of the borehole or knowing the depth of the liquid level in the borehole is needed to check the depth of the borehole. [0003] At present, there are three ways to measure the drilling depth. One is to strike the tail of the drill ...
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IPC IPC(8): E21B47/04
Inventor 覃思胡继武程建远
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP