Downhole magnetic field detection device while drilling

A detection device and magnetic field technology, which is applied in the field of drilling and exploration engineering, and can solve problems such as geomagnetic anomalies and detection while drilling
CN111119868BActive Publication Date: 2021-07-06CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Publication Date
2021-07-06

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Abstract

The invention provides a downhole magnetic field detection device while drilling, which outputs a PWM signal to a fluxgate drive circuit through a DSP, and at the same time, controls the FPGA to synchronously sample waveform data, and the fluxgate drive circuit excites the fluxgate sensor to sense the X, Y, and Z axes Magnetic flux, the magnetic flux is converted into a voltage signal, and the voltage signal is sequentially passed through a bandpass filter, a gain circuit, and the first analog-to-digital converter, converted into sampled waveform data and stored in the FPGA, and the DSP reads the sampled waveform data in the FPGA, and the sampled waveform Perform digital band-pass filtering on the data, perform digital phase-sensitive detection on the filtered signal obtained by digital band-pass filtering, perform digital integration on the waveform data after digital phase-sensitive detection, and perform digital low-pass filtering and amplitude extraction on the waveform data obtained by digital integration The magnetic field strength is obtained, and the magnetic field strength is sent to the central control communication circuit, which realizes the detection of the magnetic field strength while drilling in complex underground environments.
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Description

technical field

[0001] The invention relates to the technical field of drilling and exploration engineering, in particular to an underground magnetic field detection device while drilling. Background technique

[0002] During the drilling process, the metal substances around the well drilling (for example, the ferromagnetic casing in the well drilling) will generate a magnetized magnetic field, which will cause geomagnetic anomalies near the metal substances, and the detection of geomagnetic anomalies during drilling can be positive. Provide technical support for the distance and orientation of metal substances near the drilling location.

[0003] In the prior art, the method of collecting magnetic signals is to use a fluxgate to convert the external magnetic field into a voltage signal containing a second harmonic through a high-frequency drive circuit. The amplitude of the second harmonic is related to the strength of the external magnetic field, and then filtered The cir...

Claims

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