A detection method of average sound velocity in oil well
A detection method and technology for oil wells, which are applied to measurement devices, measurement of propagation velocity, measurement of ultrasonic/sonic/infrasonic waves, etc., can solve problems such as large errors and low detection accuracy of liquid level depth, and achieve elimination of medium differences, easy detection and Calculation, the effect of improving detection accuracy
Active Publication Date: 2018-01-05
贵州航天凯山石油仪器有限公司
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Problems solved by technology
These two methods of detecting the average sound velocity use the local average sound velocity instead of the average sound velocity of the whole well, and the error is relatively large, resulting in low accuracy of liquid level depth detection
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Embodiment Construction
[0012] The embodiment of the present invention: Take an oil well whose wellhead wave-to-surface wave time is 12S (this is the round-trip time, that is, the surface echo time t is 6S) as an example, select the wellhead position as the reference point, and select the first section below the wellhead The tubing and the eleventh section of tubing are sampling intervals. Each section of tubing is 10m in length. In order to facilitate detection and meet the accuracy requirements of the detection data, each section of the sampling interval can be selected as the length of a section of tubing. The sampling frequency of the surface test instrument is set to 1MHz, the input accuracy of the tubing length is set to 0.01m, and each sampling interval is detected by conventional methods (for example, the second joint hoop method described in the background art) The average sound velocity C, and the distance L from the selected test point to the reference point in each sampling interval. The t...
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The invention discloses a method for detecting the average sound velocity in an oil well, which comprises the following steps: first select a sampling interval in the oil well, and detect the average sound velocity of each sampling interval, and from the selected test points in each sampling interval to The distance between the reference points; then measure and calculate two values related to the oil well coefficient, reference point temperature, and geothermal coefficient; finally obtain the distance from the reference point to the liquid surface and the distance from the reference point to the wellhead; then compare the two distances After adding and dividing by the liquid level echo time, the average sound velocity in the oil well can be output. Due to the adoption of the above technical scheme, the present invention can effectively eliminate the influence of the medium difference in the oil well, the wellhead temperature and the ground temperature variation coefficient, avoid the detection method in which the local average sound velocity replaces the average sound velocity of the whole well, and greatly improve the detection accuracy of the average sound velocity of the oil well. The detection accuracy of the liquid surface depth of the oil well is improved, and it is suitable for popularization.
Description
Technical field [0001] The invention relates to the technical field of oil well testing, in particular to a method for detecting average sound velocity in an oil well. Background technique [0002] At present, the echo method is usually used to measure the depth of the oil well liquid level. The detection accuracy of the average sound velocity directly affects the detection accuracy of the liquid surface depth. Since the depth of an oil well is several hundred meters to several kilometers, the pressure and temperature in the well will vary greatly, so the sound velocity in the entire well will also vary greatly. There are two methods for detecting the average sound velocity by existing testing instruments: one is to detect the average sound velocity based on the phonetic symbol depth and the echo time of the phonetic symbol reflection wave instead of the average sound velocity of the whole well; The distance between the two joints and the time difference between the reflected w...
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IPC IPC(8): G01H5/00E21B47/047
Inventor 庞云伟
Owner 贵州航天凯山石油仪器有限公司