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Surface-borehole-based nuclear magnetic resonance detection system and method

A nuclear magnetic resonance and detection system technology, which is applied in the fields of electrical/magnetic detection for logging records, electronic magnetic resonance/nuclear magnetic resonance detection, climate sustainability, etc., can solve the problem of inaccurate detection information, dead time long-term issues

Active Publication Date: 2017-09-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present invention provides a nuclear magnetic resonance detection system and method based on the well mode, which is used to solve the technical problem of inaccurate detection information caused by the long dead time of the SNMR method in the prior art

Method used

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  • Surface-borehole-based nuclear magnetic resonance detection system and method
  • Surface-borehole-based nuclear magnetic resonance detection system and method
  • Surface-borehole-based nuclear magnetic resonance detection system and method

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Embodiment 1

[0046] This embodiment provides a nuclear magnetic resonance detection system based on the well mode, please refer to figure 1 , the system includes:

[0047] Transmitting module 1, comprises main frame 11, the PC machine 12 that is connected with described main frame 11 and the transmitting coil 13 that is connected with described main frame, wherein, described transmitting coil is placed on the ground, and is used for transmitting excitation magnetic field, and described PC machine uses for controlling the transmitting process of the transmitting coil;

[0048] The receiving module 2 is communicatively connected with the transmitting module, including a receiver 21 and a receiving coil 22 connected with the receiver, and the receiving module is placed downhole, wherein the receiving coil is used to receive the nuclear magnetic field produced by the water-bearing body. Resonant response signal;

[0049] Wherein, the receiver can collect downhole signals based on preset init...

Embodiment 2

[0065] Based on the same inventive concept as in Embodiment 1, Embodiment 2 of the present invention provides a method for detecting nuclear magnetic resonance based on a well mode, which is realized by using the nuclear magnetic resonance detection system described in Embodiment 1. Please refer to figure 2 , the method includes:

[0066] Step S201: Obtain the first related parameters of the transmitting coil placed on the ground, the first related parameters include the center position and size of the transmitting coil;

[0067] Step S202: Obtain second related parameters of the receiving coil placed downhole, the second related parameters including the number of turns, radius, depth and center position of the receiving coil;

[0068] Step S203: According to the central position of the receiving coil and the central position of the transmitting coil, obtain a third related parameter of the receiving coil relative to the transmitting coil, wherein the third related parameter ...

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Abstract

The invention discloses a surface-borehole-based nuclear magnetic resonance detection system and a method, wherein the nuclear magnetic resonance detection system comprises: an emission module including a main machine, a PC connected with the main machine and an emission ring connected with the main machine wherein the emission ring is arranged on a ground and used to emit an exciting magnetic field and the PC is used to control the emission process of the emission ring; and a receiving module in communicative connection with the emission module and comprising a receiver and a receiving ring connected with the receiver wherein the receiving module is arranged under a well; the receiving ring is used to receive the water-body-generated nuclear magnetic resonance signal; and the receiver is able to acquire the under-well signal based on preset initial instructions and saves the under-well signal in a storage module and finally, through inversion software, processes the under-well signal so as to obtain the under-well distribution information. The system and the method of the invention solve the technical problem that detection information is not accurate due to the relatively long dead zone time in the currently available SNMR method.

Description

technical field [0001] The invention relates to the technical field of geological detection, in particular to a nuclear magnetic resonance detection system and method based on a well mode. Background technique [0002] Surface nuclear magnetic resonance (SNMR) has been used in groundwater detection for nearly 40 years. Because of its property of directly detecting groundwater, this method has been widely used in hydrogeology and engineering geology. [0003] In the prior art, the detection method for underground disaster water sources generally adopts the above-mentioned SNMR method. First, the transmitting system emits an alternating current into the coil for a period of time to excite the hydrogen nuclei in the groundwater to generate nuclear magnetic resonance. Then the switch controls the coil to change from the transmitting state to the receiving state, and the NMR signal is detected, conditioned and amplified by the receiving system connected to the coil, so as to obt...

Claims

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Application Information

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IPC IPC(8): G01V3/32
CPCG01V3/32Y02A90/30
Inventor 李振宇吴鹏潘剑伟王鹏张文波李凡谢梦莹鲁恺黄学明洪涛
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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