A method of testing liquid surface echo time
A technology of echo time and test liquid, applied in construction and other directions, can solve the problems of incompletely accurately distinguishing liquid surface echo signals, filter circuit unable to accurately distinguish two kinds of signals, and time-consuming, so as to overcome low-frequency interference. The serious influence of the signal, the effect of improving the test accuracy and test efficiency, and expanding the scope of application
Active Publication Date: 2015-11-04
贵州航天凯山石油仪器有限公司
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Problems solved by technology
However, when the pumping unit is in working condition, or when there is serious low-frequency interference such as mechanical construction at the test site, the frequency of the interference signal is relatively similar to the frequency of the liquid level echo signal, and the filter circuit cannot accurately distinguish the two signals. Poor, often leads to incorrect calculation of liquid surface depth results
In order to eliminate this kind of misjudgment, the operator will conduct multiple tests and manually select the signal that is relatively close as the liquid level echo signal, which takes too long and the work efficiency is low
And because the depth of the liquid surface will change, multiple tests cannot completely distinguish the echo signal of the liquid surface
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] Embodiment of the present invention: earlier at the wellhead, several acoustic pulse signals (such as image 3 As shown, the wellhead uses an electric horn to fire three acoustic pulse signals with a pulse width of 10ms), and records the time interval between them (for example image 3 As shown, the time interval T2 between the first and the second sound pulse signal is 50ms, and the time interval T3 between the first and the third sound pulse signal is 200ms. The present invention can also take the time interval between the second and the third sound pulse signal as T3); then use the existing conventional filter circuit to filter the echo signal, and find out all the suspected liquid level echo signals; then judge Whether the time interval between the suspected liquid level echo signals is the same as the time interval of the firing sound pulse...
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The invention discloses a method for testing liquid level echo time. The method comprises the following steps of: triggering a plurality of acoustic impulse signals at a well head, and recording the time interval between the signals; filtering each echo signal by a filtering circuit, and finding all suspected liquid level echo signals; finally judging whether the time interval among the suspected liquid level echo signals is the same with the time interval of the triggered acoustic impulse signals; and taking the time from the starting time of the suspected liquid level echo signals with the same time interval to the starting time of triggering the first acoustic impulse signal at the well head as the liquid level echo time. Because of adopting the technical scheme, the liquid level echo signal can be exactly identified by one testing; the serious affect of low-frequency interference signals in a test field can be conquered; and the testing accuracy and testing efficiency can be improved. By the method, the application range of an oil well liquid level testing apparatus can be enlarged, and the method is suitable for popularizing.
Description
technical field [0001] The invention relates to the technical field of oil well instrument testing, in particular to a method for testing liquid surface echo time. Background technique [0002] At present, the echo method is usually used to measure the depth of oil well liquid level. This method needs to accurately test the time from the sound pulse signal generated by the wellhead to the liquid level echo signal received. Since the echo signal contains interference signals in the normal test process, it is necessary to separate the liquid level echo signal representing the liquid level information from other interference signals in order to calculate the sound pulse signal from the wellhead to receive the liquid level echo signal time. The current testing method of various oil well instruments is only to filter out the interference signal through the filter circuit and separate the liquid level echo signal. However, when the pumping unit is in working condition, or when ...
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IPC IPC(8): E21B47/047
Inventor 庞云伟马巧红周文强
Owner 贵州航天凯山石油仪器有限公司