Method for measuring weak mud pulse pressure waves under high stand pipe pressure
A technology of mud pulse and measurement method, which is applied in the pressure difference measurement, measurement, measurement device and other directions between multiple valves, to achieve the effects of precise measurement, great practical value, and high measurement accuracy
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Embodiment 1
[0035] Embodiment 1: as attached Figures 1 to 3 As shown, the measurement method of the weak mud pulse pressure wave under high vertical pressure includes the following steps:
[0036] The first step: determine the error and resolution;
[0037] According to the measured mud pulse pressure amplitude, select a differential pressure sensor with appropriate range, error and resolution.
[0038] If the maximum amplitude of the measured mud pulse is 0.1MPa and the maximum allowable absolute error is 0.01MPa, the total accuracy of the measurement system is required to be better than 10%. If a differential pressure sensor with a total error of less than 5% is selected, the maximum allowable absolute error is 0.01MPa. It is required that the maximum range of the measurement system (differential pressure sensor) does not exceed 0.2MPa, so choosing a differential pressure sensor with a range of 0.1MPa to 0.2MPa can ensure the required measurement accuracy, and choosing a static range ...
Embodiment 2
[0058] Embodiment 2: Measurement environment: standpipe pressure 35 MPa, pulse signal pressure amplitude 0.5 MPa, ratio of dynamic pressure to static pressure 1.4%. The waveform of the dynamic pressure is as Figure 4 shown.
[0059] For this measurement environment, the measurement method of the weak mud pulse pressure wave under high vertical pressure includes the following steps:
[0060] (1) Determine the error and resolution
[0061] Using the error theory about the error relationship between the measuring tool and the detected object, the ratio of the random error of the measurement system to the fluctuation of the measured signal should be less than 1 / 3, that is, under the condition of 35MPa standpipe pressure, the total accuracy should be better than 1.4%×1 / 3=0.5%, the absolute error of measurement should not be greater than 0.5MPa×1 / 3=0.17MPa. The lowest measurable vibration level in the process of dynamic pressure measurement is when the signal-to-noise ratio is ...
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