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Calculation method of gravity tool surface angle of inclinometer while drilling based on MEMS accelerometer with small range

A technology of acceleration sensor and inclinometer while drilling is applied in the field of petroleum drilling engineering, which can solve the problems of large vibration and inability to measure the gravity tool face angle, and achieves the effect of reducing the system cost, improving the promotion value and ensuring the accuracy.

Active Publication Date: 2018-12-18
SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under static working conditions, the vibration is extremely small, and the small-range MEMS acceleration sensor meets the requirements; under directional drilling conditions, the vibration is relatively large, and the small-range MEMS acceleration sensor cannot measure the gravity toolface angle with traditional algorithms; under compound drilling conditions, There is no requirement for the gravity tool face angle

Method used

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  • Calculation method of gravity tool surface angle of inclinometer while drilling based on MEMS accelerometer with small range
  • Calculation method of gravity tool surface angle of inclinometer while drilling based on MEMS accelerometer with small range
  • Calculation method of gravity tool surface angle of inclinometer while drilling based on MEMS accelerometer with small range

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Embodiment 1

[0031] Embodiment 1, this embodiment provides a method for calculating the gravity tool face angle of an inclinometer while drilling based on a small-range MEMS acceleration sensor

[0032] First of all, in order to ensure the accuracy of the collected data, in this embodiment, the small-range MEMS acceleration sensor and the fluxgate on the exploration-while-drilling inclinometer meet the requirements of room temperature, the sensitivity of the acceleration sensor is less than 1mg, and the sensitivity of the fluxgate is less than 5nT. In this way, the sensor section is composed of a small-range MEMS acceleration sensor and a fluxgate.

[0033] Then, the data of well inclination (INC), azimuth (Az) and magnetic inclination (λ) are collected and preserved under static working conditions. In this embodiment, a certain type of MEMS acceleration sensor is selected, and the range of this sensor is ± 1.7g ( g is the unit of gravitational acceleration), built-in moving average digita...

Embodiment 2

[0059] Embodiment 2, this embodiment provides a method for calculating the gravity tool face angle of an inclinometer while drilling based on a small-range MEMS acceleration sensor

[0060] Compared with Embodiment 1, in this embodiment, the time period is selected as 5s, and the collected data obtained are as follows:

[0061] Table 3, data of acceleration sensor (Gx, Gy) and fluxgate (Bx, By) in units of 5s under directional drilling conditions

[0062]

[0063]

[0064] After calculation, the obtained data are as follows:

[0065] Table 4. Calculation data of gravity toolface angle at 5s time interval during bottom hole directional drilling

[0066]

[0067]

[0068] Through data verification, it can be clearly seen that the error of the method provided in this embodiment is between ±0.1°, and the data calculation is accurate.

Embodiment 3

[0069] Embodiment 3, this embodiment provides a method for calculating the gravity tool face angle of an inclinometer while drilling based on a small-range MEMS acceleration sensor

[0070] Compared with Embodiment 1 and Embodiment 2, in this embodiment, the time period is selected as 10s, and the acquired data is as follows:

[0071] Table 5, data of acceleration sensor (Gx, Gy) and fluxgate (Bx, By) in units of 10s under directional drilling conditions

[0072]

[0073] After calculation, the obtained data are as follows:

[0074] Table 6. Calculation data of gravity tool face angle at 10s time interval during bottom hole directional drilling

[0075]

[0076]

[0077] Through data verification, it can be clearly seen that the error of the method provided in this embodiment is between ±0.1°, and the data calculation is accurate.

[0078] In summary, the method provided by the present invention can accurately calculate the actual gravity tool face angle, and effect...

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Abstract

The invention belongs to the field of petroleum drilling engineering, in particular to a method for calculating the surface angle of a gravity tool of an inclinometer while drilling based on a small-range MEMS acceleration sensor. Firstly, the sensitivity of MEMS accelerometer and fluxgate is less than 1mg and 5nT respectively at room temperature. The sensitivity of MEMS accelerometer and fluxgateis less than 5nT. Acquired data on well deviation (INC), azimuth (Az) and magnetic dip (Lambda) under static conditions are preserved; the mathematic model of sensor orthogonal calibration is established. The values of acceleration sensor and fluxgate component are calculated according to the traditional algorithm and the algorithm provided in step c, and stored in two arrays. The results show that the acceleration sensor and the fluxgate component are in good agreement with each other. After several fixed time periods, the standard deviation of the data in the two arrays is calculated respectively, and the data at the end of the arrays with relatively small standard deviation is selected as the real calculation value of the gravity tool face angle. The invention greatly improves the application range of the small-range MEMS acceleration sensor and reduces the cost of the MWD system.

Description

technical field [0001] The invention belongs to the field of petroleum drilling engineering, and in particular relates to a method for calculating the gravity tool face angle of an inclinometer while drilling based on a small-range MEMS acceleration sensor. Background technique [0002] At present, the measurement while drilling (MWD) system has become an indispensable part of the field of petroleum drilling engineering, and the acquisition of downhole data is the most important thing. In geological exploration, in order to be able to determine the lateral dip and dip azimuth of the formation, it is necessary to continuously measure the dip and dip azimuth of the wellbore and the azimuth of the downhole tool as a reference mark. In order to make the wellbore trajectory consistent with the design, it is inevitable to adjust the corresponding well deviation or azimuth during the drilling process. At this time, it is necessary to be able to accurately and real-time monitor the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 刘庆吴雨萱吴俊杰
Owner SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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