System and method of transient electromagnetic advanced detection

Patent metadata

Field	Value
Publication number	US-11879327-B2
Application number	US-202117465015-A
Country	US
Kind code	B2
Filing date	Sep 2, 2021
Priority date	Feb 5, 2021
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

Disclosed is a system and a method of transient electromagnetic advanced detection. The system includes a detection host, an electromagnetic signal transmitter, a probe, and a communication device. The system and method of transient electromagnetic advance detection disclosed by examples of the present disclosure can realize an early-warning through a transient electromagnetic advance detection in a borehole while drilling the borehole in a tunnel or a roadway.

First claim

What is claimed is:

1. A system of transient electromagnetic advanced detection, comprising:
a detection host, an electromagnetic signal transmitter, a probe, and a communication device; wherein,
the electromagnetic signal transmitter, connected to the detection host and arranged at one end of a drill rod away from a drill bit, is configured to emit a transient electromagnetic signal in accordance with a detection control signal from the detection host;
the probe, arranged inside another end of the drill rod and close to the drill bit, is configured to receive a secondary magnetic signal excited by the transient electromagnetic signal via surrounding rocks, generate a drilling trajectory based on positions of the probe, and send the secondary magnetic signal and the drilling trajectory to the detection host via the communication device;
the detection host is configured to determine a three-dimensional electromagnetic signal intensity of each coordinate point of a plurality of coordinate points according to the secondary magnetic signal and the drilling trajectory, and determine a position of a harmful geological body in a borehole according to the three-dimensional electromagnetic signal intensity of said each coordinate point of the plurality of coordinate points; and
the communication device is configured to establish a communicative connection between the detection host and the probe.

2. The system of claim 1 , wherein the drill rod comprises a non-magnetic drill rod part disposed adjacent to the drill bit and a second drill rod part disposed away from the drill bit;
the non-magnetic drill rod part is coupled to the second drill rod part, and the probe is disposed inside the non-magnetic drill rod part.

3. The system of claim 2 , wherein the second drill rod part is made of metal materials and the non-magnetic drill rod part is made of non-magnetic metal materials.

4. The system of claim 1 , wherein a housing of the probe is made of non-magnetic metal materials.

5. The system of claim 1 , wherein the electromagnetic signal transmitter comprises at least one transient electromagnetic signal transmitting coil of a plurality of transient electromagnetic signal transmitting coils, configured to transmit the transient electromagnetic signal in accordance with the detection control signal; and
the detection host comprises a transient electromagnetic signal transmitting circuit connected to the at least one transient electromagnetic signal transmitting coil; wherein,
the transient electromagnetic signal transmitting circuit is configured to control the at least one transient electromagnetic signal transmitting coil.

6. The system according to claim 5 , wherein the transient electromagnetic wavo signal transmitting circuit comprises:
at least one transient electromagnetic signal transmitting unit of a plurality of transient electromagnetic signal transmitting units; wherein, each of the at least one transient electromagnetic signal transmitting unit is connected to the at least one transient electromagnetic signal transmitting coil for controlling the at least one transient electromagnetic signal transmitting coil to transmit the transient electromagnetic signal; and
a transmitting control circuit, connected to the at least one transient electromagnetic signal transmitting unit, is configured to transmit a control signal to the at least one transient electromagnetic signal transmitting unit to enable the at least one transient electromagnetic signal transmitting unit to control the at least one transient electromagnetic signal transmitting coil.

7. The system of claim 6 , wherein the at least one transient electromagnetic signal transmitting unit comprises: a full-bridge transmitting circuit, a power supply and a resistor connected in parallel across the full-bridge transmitting circuit; wherein,
the full-bridge transmitting circuit comprises a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a first diode, a second diode, a third diode and a fourth diode.

8. The system of claim 7 , wherein,
a gate electrode of the first insulated gate bipolar transistor is connected to the transmitting control circuit, a collector electrode of the first insulated gate bipolar transistor is connected to an anode of the power supply; an emitter electrode of the first insulated gate bipolar transistor is connected to one end of the resistor, and another end of the resistor is connected to one end of the at least one transient electromagnetic signal transmitting coil;
a gate electrode of the second insulated gate bipolar transistor is connected to the transmitting control circuit, a collector electrode of the second insulated gate bipolar transistor is connected to the anode of the power supply, and an emitter electrode of the second insulated gate bipolar transistor is connected to another end of the at least one transient electromagnetic signal transmitting coil;
a gate electrode of the third insulated gate bipolar transistor is connected to the transmitting control circuit, a collector electrode of the third insulated gate bipolar transistor is connected to the one end of the resistor, and an emitter electrode of the third insulated gate bipolar transistor is connected to a cathode of the power supply; and
a gate electrode of the fourth insulated gate bipolar transistor is connected to the transmitting control circuit, a collector electrode of the fourth insulated gate bipolar transistor is connected to the other end of the transient electromagnetic signal transmitting coil, and an emitter electrode of the fourth insulated gate bipolar transistor is connected to the cathode of the power supply.

9. The system of claim 7 , wherein,
an anode of the first diode is connected to an emitter electrode of the first insulated gate bipolar transistor, and a cathode of the first diode is connected to a collector electrode of the first insulated gate bipolar transistor;
an anode of the second diode is connected to an emitter electrode of the second insulated gate bipolar transistor, and a cathode of the second diode is connected to a collector electrode of the second insulated gate bipolar transistor;
an anode of the third diode is connected to an emitter electrode of the third insulated gate bipolar transistor, and a cathode of the third diode is connected to a collector electrode of the third insulated gate bipolar transistor; and
an anode of the forth diode is connected to an emitter electrode of the fourth insulated gate bipolar transistor, and a cathode of the fourth diode is connected to a collector electrode of the fourth insulated gate bipolar transistor.

10. The system of claim 5 , further comprising:
a transient electromagnetic signal receiving coil, disposed on the electromagnetic signal transmitter and concentrically disposed with the at least one transient electromagnetic signal transmitting coil, is configured to receive the transient electromagnetic signal transmitted by the at least one transient electromagnetic signal transmitting coil; and
a single-channel transient electromagnetic signal receiving circuit, disposed on the detection host and connected to the transient electromagnetic signal receiving coil, is configured to process the transient electromagnetic signal received by the transient electromagnetic signal receiving coil to obtain a transient electromagnetic detection data map.

11. The system of claim 10 , wherein the probe comprises:
a second receiver, configured to receive a probe control command sent by a first transmitter;
a second receiving circuit, connected

Assignees

• Univ China Mining
• Wuhan Changsheng Mine Security Tech Limited
• China Univ Of Mining And And Technology Beijing

Inventors

• Wu Qiang
• Liu Chunsheng
• Zeng Yifan
• Liu Liu
• Tao Fengjuan
• Hu Gang

Classifications

• E21B47/12 Primary

  Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling · CPC title

• E21B47/04

  Measuring depth or liquid level · CPC title

• E21F17/18

  Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per se G01N) · CPC title

• E21B49/00 Primary

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• E21B47/113

  using electrical indications; using light radiations · CPC title