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Signal processing device for nuclear magnetic resonance logger

A technology of nuclear magnetic resonance logging tool and signal processing device, which is used in surveying, wellbore/well components, earth-moving drilling, etc., can solve problems such as distortion and nuclear magnetic resonance signal interference, reduce the probability of introducing noise, and eliminate signals. Distortion, the effect of improving signal quality

Active Publication Date: 2012-12-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defect that the current nuclear magnetic resonance signal is easily disturbed and distorted at the part where the probe and the circuit are connected.

Method used

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  • Signal processing device for nuclear magnetic resonance logger
  • Signal processing device for nuclear magnetic resonance logger
  • Signal processing device for nuclear magnetic resonance logger

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Embodiment Construction

[0040] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0041] The signal processing device in the embodiment of the present invention is embedded in the probe of the nuclear magnetic resonance logging tool. Three antennas are arranged in the probe, and each antenna works independently through its own relay, and each antenna corresponds to a signal processing device according to an embodiment of the present invention.

[0042] Such as figure 1 As shown, the signal processing device in the embodiment of the present invention mainly includes an isolation circuit 10 , a preamplification circuit 20 and an acquisition processing circu...

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Abstract

The invention discloses a signal processing device for a nuclear magnetic resonance logger, and the existing shortcoming that a nuclear magnetic resonance signal enters at the position where a probe and a circuit are connected and causes interference so that distortion happens is overcome. The device is embedded in the probe of the nuclear magnetic resonance logger, and comprises an isolating circuit, a pre-amplification circuit and a collecting and processing circuit, the isolating circuit is used for conduction when an antenna receives a signal, the pre-amplification circuit is used to filter and amplify the signal received by the antenna and output a pre-processed signal which is sent to the collecting and processing circuit, the collecting and processing circuit is used to collect the pre-processed signal to obtain a collected signal and process the collected signal with related digital phase sensitivity detecting (DPSP) or wavelet-type DPSP, and accordingly amplitude value and phase information of a nuclear magnetic resonance echo signal can be obtained. The signal processing device for the nuclear magnetic resonance logger rules out the possibility of signal distortion caused by remote transmission.

Description

technical field [0001] The invention relates to a signal processing device, in particular to a signal processing device for a nuclear magnetic resonance logging tool. Background technique [0002] The current nuclear magnetic resonance logging tool is generally designed separately from the probe and the short section of the circuit. The nuclear magnetic resonance signal received by the probe needs to go through a long distance to reach the processing circuit. Since the NMR signal is very weak, the connection between the probe and the circuit is very easy to introduce external interference and cause signal distortion. Contents of the invention [0003] The technical problem to be solved by the invention is to overcome the defect that the current nuclear magnetic resonance signal is easily disturbed and distorted at the position where the probe and the circuit are connected. [0004] In order to solve the above technical problems, the present invention provides a signal pro...

Claims

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Application Information

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IPC IPC(8): E21B47/00
Inventor 宋公仆张嘉伟
Owner CHINA NAT OFFSHORE OIL CORP
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