Calibration method for logging-while-drilling device

A calibration method of a logging while drilling device, wherein measurement data is taken beginning at sea level, and the calibration method comprises:

• the logging while drilling device comprises a first transmitter, a second transmitter, a third transmitter, a fourth transmitter, a first receiver and a second receiver;
• the first transmitter, the second transmitter, the third transmitter and the fourth transmitter are sequentially arranged on the logging while drilling device in a well-entering direction;
• the first receiver is arranged between the first transmitter and the second transmitter, and the first receiver is configured to receive signals transmitted by the third transmitter and the fourth transmitter;
• the second receiver is arranged between the third transmitter and the fourth transmitter, and the second receiver is configured to receive signals transmitted by the first transmitter and the second transmitter;
• and
• suspending the logging while drilling device horizontally;
• and the logging while drilling device measures amplitudes and phases at different heights;
• the amplitudes and phases measured comprise:
• sequentially measuring the amplitudes and phases of signals transmitted by the first emitter, the fourth emitter, the second emitter and the third emitter by using the logging while drilling;
• the logging while drilling device measures both in the initial floating position and after being rotated position;
• rotating the logging while drilling device multiple times horizontally, and measuring amplitudes and phases at different heights after each horizontal rotation;
• when the sum of the angles of multiple horizontal rotations is greater than 360 degrees, and a azimuth correction factor is calculated according to the amplitudes and phases;
• and
• the amplitudes and phases measured at different heights comprise:
• the amplitudes and phases measured once every 0.5 m between 1.5 and 8 m above sea level to obtain first measurement results;
• the amplitudes and phases measured once every 0.3 m between 0.3 and 1.5 m above sea level to obtain second measurement results;
• the first measurement results and the second measurement results are first data;
• a plurality of the first data are converted into real parts and imaginary parts, and a phase shift factor and an amplitude reduction factor are calculated through the real parts and the imaginary parts.