High-power downhole electromagnetic pulse transmission device

A technology of electromagnetic pulse and transmitting device, which is applied in the direction of borehole/well valve device, electric/magnetic detection for well logging, electromagnetic wave detection, etc. It can solve the problems of inconvenient exploration work and achieve average power Small size, low cost of use, and large detection radius

Inactive Publication Date: 2011-08-10
YANGTZE UNIVERSITY
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Problems solved by technology

At that time, increasing power supply was directly proportional to increasing the volume and weight of power supply equipment. For examp...

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  • High-power downhole electromagnetic pulse transmission device
  • High-power downhole electromagnetic pulse transmission device
  • High-power downhole electromagnetic pulse transmission device

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[0034] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the examples should not be construed as limiting the present invention.

[0035] refer to figure 1 , the whole system of the present invention is made up of surface instrument 1 and downhole instrument 2 two parts. The surface instrument 1 supplies power and controls the downhole instrument 2 through cables.

[0036] The principle of the underground high-power electromagnetic pulse transmitting device realized by the present invention is as follows: figure 2 shown. The alternating current is provided by the ground instrument 1, and the capacitor 5 is charged through the rectifier 3 and the switch 4. After the charging is completed, the switch 4 disconnects the rectifier 3 and connects the transmitting coil 6, and the electric energy stored in the electrolytic capacitor 5 is released instantaneously ( image 3 The pseudo-Gaussian pulse waveform shown i...

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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...

Claims

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Application Information

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IPC IPC(8): G01V3/30
CPCG01V3/30E21B47/06E21B49/008E21B34/02G01V3/28
Inventor 胡文宝王军民罗明璋张辉徐菲杨旭辉魏勇雷鸣董浩斌严良俊熊晓东胡家华杨居朋王林松付永前
Owner YANGTZE UNIVERSITY
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