Ground equipment signal transmit-receive method and underground equipment signal transmit-receive method

Abstract

A ground equipment signal transmit-receive method and an underground equipment signal transmit-receive method are provided; the ground equipment signal transmit-receive method comprises the following steps: a transmit-receive instruction determine step determining whether a ground signal sending instruction exists or not, if yes, executing a ground signal sending step, otherwise executing an underground signal receive step; the ground signal sending step used for coding and modulating a to-be-sent ground signal, amplifying the signal power, converting the amplified electric signal into an electromagnetic signal, and sending the electromagnetic signal to the outer side; an underground signal receive step used for converting the electromagnetic signal received from the outer side into an electric signal, modulating and amplifying the converted electric signal, and demodulating and decoding the electric signal with gain amplification, thus obtaining needed data. Compared with a normal pulse transmission mode, the two way transmission method does not need to start and stop a pump, thus saving drilling time, and preventing maloperations.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a signal sending and receiving method for surface equipment and a signal sending and receiving method for downhole equipment. Background technique [0002] Measurement while drilling is a key technical means in the construction of directional wells and horizontal wells. At present, the commonly used information transmission methods while drilling mainly include drilling fluid pressure pulse coding MWD (or conventional MWD) and electromagnetic signal modulation (EM-MWD), and generally only one-way information transmission is carried out. The measurement data modulation is transmitted from downhole to the surface on the drilling fluid pressure pulse wave or electromagnetic signal, and this process is also called uplink transmission. In order to change the working state of downhole instruments or actuators during drilling, the existing MWD or EM-MWD ...

AI Technical Summary

Problems solved by technology

[0010] The working principle of this downlink transmission link is the same as that of starting and stopping the pump and changing the combination of pump speed sequences, except that the carrier of the transmitted information becomes the drill string speed at different speeds, and it can only transmit a limited number of commands. , cannot perform complex instructions or continuous information transmission

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