Underground liquid level measuring device based on high-power ultrasonic probe admittance curve

A technology of liquid level measurement device and ultrasonic probe, which is applied in the direction of measurement, wellbore/well components, earthwork drilling and production, etc., which can solve problems such as difficult to measure the liquid level, and achieve the effect of improving the test effect and ensuring the effect

Inactive Publication Date: 2013-10-23
TIANJIN UNIV
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Problems solved by technology

It is difficult to measure the liquid level with ordinary sonic level gauge

Method used

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  • Underground liquid level measuring device based on high-power ultrasonic probe admittance curve
  • Underground liquid level measuring device based on high-power ultrasonic probe admittance curve
  • Underground liquid level measuring device based on high-power ultrasonic probe admittance curve

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] In order to realize the measurement of the downhole liquid level, especially the long-distance liquid level, and improve the testing effect of deep wells, an embodiment of the present invention provides a downhole liquid level measurement device based on the admittance curve of a high-power ultrasonic probe, see figure 1 , the downhole liquid level measurement device includes: a ground admittance measurement system 1, a special cable 2, and a high-power ultrasonic probe 3 that are electrically connected in sequence. In the air of the casing, as the depth increases, it will meet the liquid surface and enter the liquid. The ground admittance measurement system 1 includes: the excitation device 4 and the collection device 5, the exc...

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Abstract

The invention discloses an underground liquid level measuring device based on a high-power ultrasonic probe admittance curve. A high-power ultrasonic probe is put in a well, a ground admittance measuring system, which comprises an excitation device and a collection device, is positioned on the ground; the excitation device emits signals with various frequencies, the signals are added to the high-power ultrasonic probe through a special cable, during the well descending process of the high-power ultrasonic probe, the collection device continuously measures a curve of admittance of high-power ultrasonic probes in various depth changed along with the frequencies through the special cable, that is, the collection device acquires the admittance curve of the probe through a frequency scanning manner; whether the high-power ultrasonic probe enters into liquid or not is judged according to the shape change of the probe admittance curve, and the liquid level position can be determined according to the depth in which the high-power ultrasonic probe enters the liquid; according to the measured liquid level, whether the stratum is blocked or not can be judged by referring the pore pressure. The device measures before and after the ultrasonic operation, can evaluate the operation effect according to the liquid level change, and can ensure the validity of the ultrasonic operation, and particularly for a deep well, when the pore pressure is larger, the measuring effect is more obvious.

Description

technical field [0001] The invention relates to the technical field of special instruments for cased well plugging operation in petroleum engineering oil well development and construction, in particular to a downhole liquid level measuring device based on the admittance curve of a high-power ultrasonic probe. Background technique [0002] In the process of oil exploration and development, high-power ultrasonic operation on the formation is an effective tool to remove mud invasion pollution and oil well operation pollution, and unblock the oil layer. It is necessary to know the liquid level in the downhole before operation. The existing technology is to generate vibration in the air at the wellhead, and the sound wave propagates downward along the air in the casing, reflects when it encounters the liquid surface, and then propagates to the ground to be received. There is a certain physical attenuation when the sound wave propagates in the air. When the liquid surface is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/047E21B47/14
Inventor 沈建国
Owner TIANJIN UNIV
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