Near-bit wireless short pass constant current sending method and device

A constant current technology close to the drill bit, which is applied in the direction of earthwork drilling, measurement, borehole/well components, etc., can solve the problems of not using constant current emission technology, achieve great practical value, ensure stable power consumption, and avoid emission power consumption effect
CN110630253AActive Publication Date: 2019-12-31INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Publication Date
2019-12-31

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Abstract

The invention discloses a near-bit wireless constant current close short-distance transmission method and device and belongs to the technical field of near-bit well logging during drilling. The near-bit wireless constant current close short-distance transmission device comprises a transmitting part and a receiving part. After modulation treatment, a signal is sent to the receiving part through thetransmitting part in a wireless short pass mode. The transmitting part transmits the transmitting signal into the stratum according to the set rated transmitting constant current value, the rated transmitting constant current value of the transmitting signal is dynamically monitored and adjusted, and stable transmitting power is obtained. The near-bit wireless constant current close short-distance transmission method and device are provided, the transmitting power consumption problem under different-electrical-resistivity stratum conditions in the drilling-following process is avoided, the structure is simple, achieving is easy, and circuit damage caused by tool high transmitting power consumption can be avoided effectively.
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Description

technical field

[0001] The invention belongs to the technical field of logging-while-drilling near a drill bit, and in particular relates to a near-drill bit wireless short-pass constant current transmitting method and device. Background technique

[0002] At this stage, near-bit logging while drilling technology is developing rapidly. Compared with conventional logging while drilling, the sensor probe of near-bit logging tools is closer to the drill bit, which can obtain drilling formation information in a timely manner and more accurately mark drilling trajectories. Reduce drilling operation risk and improve operation efficiency. Generally speaking, the near-bit LWD instrument consists of the following three parts: near-bit measurement pup, near-bit short-distance transmission device, and measurement-while-drilling system (MWD), such as figure 1 shown. Among them, the near-bit measurement sub-section is arranged close to the drill bit, and accelerometers, magnetic sensor...

Claims

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