A Novel Wireless Measurement While drilling System for Geotechnical and Geophysical Applications

2019 ◽  
Author(s):  
M Khater ◽  
W Al-Nuaimy
Keyword(s):  
Measurement While Drilling ◽  
Drilling System ◽  
Wireless Measurement

Adaptive Compensation of the Mud Pump Noise in a Measurement-While-Drilling System

SPE Journal ◽  
1999 ◽  
Vol 4 (02) ◽  
pp. 128-133 ◽  
Author(s):  
T.L. Brandon ◽  
M.P. Mintchev ◽  
Herb Tabler
Keyword(s):  
Adaptive Compensation ◽  
Measurement While Drilling ◽  
Drilling System

scholarly journals Vibration Error Correction for the FOGs-Based Measurement in a Drilling System Using an Extended Kalman Filter

2021 ◽  
Vol 11 (14) ◽  
pp. 6514
Author(s):  
Lu Wang ◽  
Yuanbiao Hu ◽  
Tao Wang ◽  
Baolin Liu
Keyword(s):  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Measurement Accuracy ◽  
Original Data ◽  
Calibration Method ◽  
Error Model ◽  
Nonlinear Error ◽  
Measurement While Drilling ◽  
Drilling System ◽  
Vibration Error

Fiber-optic gyroscopes (FOGs)-based Measurement While Drilling system (MWD) is a newly developed instrument to survey the borehole trajectory continuously and in real time. However, because of the strong vibration while drilling, the measurement accuracy of FOG-based MWD deteriorates. It is urgent to improve the measurement accuracy while drilling. Therefore, this paper proposes an innovative scheme for the vibration error of the FOG-based MWD. Firstly, the nonlinear error models for the FOGs and ACCs are established. Secondly, a 36-order Extended Kalman Filter (EKF) combined with a calibration method based on 24-position is designed to identify the coefficients in the error model. Moreover, in order to obtain a higher accurate error model, an iterative calibration method has been suggested to suppress calibration residuals. Finally, vibration experiments simulating the drilling vibration in the laboratory is implemented. Compared to the original data, compensated the linear error items, the error of 3D borehole trajectory can only be reduced by a ratio from 10% to 34%. While compensating for the nonlinear error items of the FOG-based MWD, the error of 3D borehole trajectory can be reduced by a ratio from 44.13% to 97.22%. In conclusion, compensation of the nonlinear error of FOG-based MWD could improve the trajectory survey accuracy under vibration.

Development of Uphole Monitor for MWD in Underground Directional Drilling in Coalmine

2012 ◽  
Vol 605-607 ◽  
pp. 1929-1933
Author(s):  
Long Peng Wang ◽  
Jun Gao ◽  
Jian Ming Zhang ◽  
Zhi Jun Shi
Keyword(s):  
Measure Data ◽  
Directional Drilling ◽  
Gas Atmosphere ◽  
Measurement While Drilling ◽  
Drilling System

Measurement while drilling (MWD) is the key for underground directional drilling in coalmine. In this paper, an uphole monitor for MWD is developed to process and display downhole measure data. Firstly, an explosion-proof computer is developed, which can be used in explosive gas atmosphere. The flameproof enclosure and intrinsic safe type of protection have been employed to meet the needs of explosion-proof and communication with measure unit. A Windows-based software is subsequently developed to show the measure result and generate the in-seam drilling trajectory. The uphole monitor has been integrated into directional drilling system and demonstrated by the application in China’s coalmines.

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