US 12,265,191 B2
Method for carrier distortion compensation in MWD mud pulse telemetry
Jing Ou, Beijing (CN); Jiansheng Du, Beijing (CN); Wenxiu Zhang, Beijing (CN); Xinzhen He, Beijing (CN); Xiaolong Li, Beijing (CN); and Yuliang Wang, Beijing (CN)
Assigned to Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing (CN)
Filed by Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing (CN)
Filed on Sep. 11, 2023, as Appl. No. 18/244,562.
Claims priority of application No. 202310083608.4 (CN), filed on Feb. 8, 2023.
Prior Publication US 2024/0264325 A1, Aug. 8, 2024
Int. Cl. G01V 1/36 (2006.01); G01V 1/22 (2006.01)
CPC G01V 1/362 (2013.01) [G01V 1/22 (2013.01); G01V 2200/16 (2013.01); G01V 2210/32 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A carrier wave distortion compensation method for an MWD mud continuous wave system, characterized by comprising:
in a downhole, modulating a carrier wave according to transmission data to obtain a mud continuous wave signal to be transmitted;
transmitting the mud continuous wave signal to a ground via a mud continuous wave channel;
denoising a received pressure signal on the ground to obtain a denoised mud continuous wave signal; and
performing subsequent processing on the denoised mud continuous wave signal to obtain a final transmission data;
wherein a downhole distortion compensation is performed on the carrier wave before modulating the carrier wave and ground distortion compensation is performed on the denoised mud continuous wave signal before performing the subsequent processing on the denoised mud continuous wave signal; and
the downhole distortion compensation is implemented by correcting a waveform of the carrier wave, wherein said correcting the waveform of the carrier wave is implemented by using a compensation function of a control signal of a rotor rotation speed of a pulser; and
the ground distortion compensation is implemented by correcting the denoised mud continuous wave signal.