Signal emission device and cross-screw data transmission method for while-drilling measuring system

Abstract

The invention discloses a signal emission device for a while-drilling measuring system and a cross-screw data transmission method for the while-drilling measuring system. The cross-screw data transmission method comprises the steps that a sensing measuring module collects while-drilling measuring parameters acquired by a drill bit in real time; a central processing module receives the while-drilling measuring parameters and conducts coding, and a first alternating current signal and a frequency control signal which contain parameter information are generated; an emission control module receives the signals sent by the central processing module and generates a second alternating current signal matched with the frequency control signal, the corresponding voltage difference is formed at an upper nipple and a lower nipple of the emission control module, and a corresponding emission current signal is output for transmission; and the central processing module receives feedback information corresponding to emission currents detected by the emission control module, and the target emission frequency is adjusted on the basis so as to adjust the frequency of an emission current signal. According to the signal emission device for the while-drilling measuring system and the cross-screw data transmission method for the while-drilling measuring system, the emission power is self-adaptively adjusted according to the surrounding strata and electrical conductivity changes of drilling fluid, and the battery using working efficiency is improved.

Description

technical field [0001] The invention relates to the field of measurement-while-drilling for oil exploration and development, in particular to a signal transmitting device and a cross-screw data transmission method for a measurement-while-drilling system. Background technique [0002] With the continuous development of oil and natural gas, the development of early conventional oil and gas reservoirs has come to an end. At present, the development of unconventional oil and gas reservoirs and complex oil and gas reservoirs has developed from shallow to deep layers, and the application of these drilling techniques is becoming more and more widely. During the construction of these wells, since it is very important to increase the drilling rate and oil drainage area through geosteering to increase the production of a single well, the requirements for the measurement-while-drilling instruments used in geosteering construction are getting higher and higher , in particular, it is re...

AI Technical Summary

Problems solved by technology

Therefore, when the conductivity of the surrounding formation and drilling fluid is high, if the transmitter module cannot be properly adjusted, the entire circuit is equivalent to working under the condition of a short circuit, resulting in a large amount of battery power consumption

Conversely, if the transmission power is designed to be small, when the electrical conductivity of the surrounding formation and drilling fluid is low, the signal received by the sub-section above the screw will be too weak to effectively decode the data transmitted from the sub-section near the drill bit.

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