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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

Active Publication Date: 2021-02-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for measuring weak mud pulse pressure waves under high vertical pressure, which overcomes the shortcomings of the above-mentioned prior art, and can effectively solve the problem that the existing measurement methods are difficult to measure very small pulse pressure under high static pressure question

Method used

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  • Method for measuring weak mud pulse pressure waves under high stand pipe pressure
  • Method for measuring weak mud pulse pressure waves under high stand pipe pressure
  • Method for measuring weak mud pulse pressure waves under high stand pipe pressure

Examples

Experimental program
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Effect test

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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Abstract

The invention belongs to the technical field of oil and gas well underground while-drilling information measurement methods and relates to a method for measuring weak mud pulse pressure waves under high stand pipe pressure. The method comprises the following six steps of: error and resolution determination, static verification, dynamic electric verification, dynamic pressure isolation of a staticpressure pipeline, installation and diaphragm protection, and precision improvement. According to the method of the invention, the ultra-low magnitude dynamic pressure measurement under the high standpipe pressure of slurry can be realized, the high stand pipe pressure of the slurry can be borne, and a dynamic pressure measurement range is wide; meanwhile, ultra-low magnitude measurement precision is met; and the problems of zero drift and working frequency interference of a strain type measurement method and a piezoelectric type measurement method are avoided. The method can effectively adapt to a mud pulse signal measurement environment, achieves accurate measurement, remarkably reduces the bit error rate and has a great practical value.

Description

technical field [0001] The invention relates to the technical field of a method for measuring downhole drilling information of oil and gas, and relates to a method for measuring weak mud pulse pressure waves under high standing pressure. Background technique [0002] The mud pulse pressure wave signal transmitted in the drill string is essentially generated by the compressibility of the mud, and the reliability of the monitoring and control data while drilling is based on the reliability of various measurement data. In the process of the mud pulse signal propagating along the mud medium in the drill string, the pulse signal is affected by various factors such as well depth, transmission frequency, mud density, friction resistance of the inner wall of the drill string, drilling pump pressure, etc., and its transmission process is a continuous attenuation. As a result, the amplitude of the pressure wave signal collected by the ground decoding system is small and the noise is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00G01L13/02E21B47/06
CPCG01L27/005G01L13/025E21B47/06
Inventor 尚仓健伊明乔东宇赵继斌李富强张磊王飞跃孙鹏成攀飞
Owner BC P INC CHINA NAT PETROLEUM CORP
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