High-power downhole electromagnetic pulse transmission device

Abstract

The invention discloses a high-power downhole electromagnetic pulse transmission device which comprises a ground instrument and a downhole instrument. The core of the ground instrument is an industrial personal computer and consists of a depth / magnetic mark / global position system (GPS) signal recording module, a Manchester coding and decoding module and a cable driving module; the depth / magnetic mark / GPS signal recording module and the Manchester coding and decoding module are connected with the industrial personal computer respectively through two serial ports; based on the principle of phantom power supply, the cable driving module is connected with the downhole instrument by a cable; the downhole instrument is sequentially provided with an alternating-current boost module, an energy-storage capacitor, a transmitting coil, a data acquisition module, a high-voltage discharging switch and a controller manipulated by a computer; and the ground instrument supplies power to the downhole instrument through the cable. By the high-power downhole electromagnetic pulse transmission device, magnetic field pulse excitation with instantaneous high power can be realized in a cased well, full time-interval data during transmitting wave forms and receiving signals in a well is recorded, and an observation system is provided for a downhole electromagnetic detection method which is used for evaluating and developing the distribution state of remaining oil in an oil storage layer.

Description

technical field [0001] The invention relates to the control technology and hardware realization of the geophysical measurement in the well, especially a kind of instantaneous high-power pulsed magnetic field excitation in the cased well, and the observation of the change of the induced electromotive force with time, in order to evaluate the remaining oil in the development reservoir The distributed electromagnetic detection method in the well provides an observation system. Background technique [0002] In order to achieve good geological results in electrical prospecting, the best way is to enhance the source of power supply. At present, the interference of industrial electric current in the field is extremely great, and its signal-to-noise ratio is tens or several hundredths of that in the 1950s. Therefore, it is necessary to increase the field source power by tens to hundreds of times to suppress this powerful interference. [0003] When the signal-to-noise ratio is very...

AI Technical Summary

Problems solved by technology

At that time, increasing power supply was directly proportional to increasing the volume and weight of power supply equipment. For example, at that time, 2000 ampere power generation equipment needed two large vehicles to drive, which made the exploration work very inconvenient.

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