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Method and system for measuring resistivity of underground medium by using single coil

A medium resistance, single-coil technology, which is applied in the direction of electrical/magnetic detection for logging records, electromagnetic wave detection, etc., can solve the problems of high cost, complex system, complex receiving circuit, etc., to improve the measurement speed and stability. Sexual, cost-saving effect

Active Publication Date: 2012-09-26
SHANDONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The existing method has the disadvantages of complex system, complex receiving circuit, complex calculation and high cost

Method used

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  • Method and system for measuring resistivity of underground medium by using single coil
  • Method and system for measuring resistivity of underground medium by using single coil
  • Method and system for measuring resistivity of underground medium by using single coil

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Embodiment

[0036] A method for measuring the resistivity of downhole medium with a single coil, such as Figure 1 to Figure 11 As shown, a single transmitting coil is regarded as a coil probe, and the transmitting coil sends electromagnetic wave signals into the formation to be measured, the reflection coefficient and impedance of the transmitting coil are measured, and the resistivity of the formation is calculated from this. The method includes the following steps:

[0037] 1) Install the transmitting coil on the drill collar, load the high-frequency signal on the coil, and measure the reflected high-frequency signal received by the transmitting coil;

[0038] 2) Calibrate the reflection coefficient of the measuring coil in brine with different resistivities, and make a table of the corresponding relationship between the measured reflection coefficient and the brine resistivity, which is used for query during drilling measurement.

[0039] 3) The measurement system calculates the refle...

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Abstract

The invention discloses a method and a system for measuring the resistivity of an underground medium by using a single coil, and belongs to the technical field of underground measurement. The measurement-method-based measurement system is designed. The method comprises the following steps of: sleeving a metal coil which serves as a probe on a drill collar, generating a high-frequency signal by using a frequency sweeping signal generator, transmitting the high-frequency signal into a transmitting coil through a 50-ohm coaxial line, measuring a reflection coefficient of the transmitting coil, and calculating the impedance of the transmitting coil and the resistivity of the medium, thereby obtaining the electromagnetic characteristics of the stratum. A relationship between an S parameter of the single coil and the medium resistivity of the stratum is simulated. The designed measurement system comprises the frequency sweeping signal generator, the transmitting coil, an S parameter measurer and a network analyzer. By the system, the medium resistivity of the underground stratum can be accurately measured, so that the system can be used for analyzing the storage information of oil gases, minerals and the like of the stratum.

Description

technical field [0001] The invention relates to a method and system for measuring the resistivity of a downhole medium with a single coil, belonging to the technical field of downhole measurement. Background technique [0002] In order to achieve the purpose of measuring the resistivity of the formation medium, the existing logging method of electromagnetic wave propagation and measurement of resistivity uses multiple coils. In a classic single send double receive system, one of them is a transmitting coil and two are receiving coils. In each measurement, a high-frequency AC signal is provided by the frequency sweep signal generator, which is sent to the transmitting coil after power amplification, and then the amplitude and phase of the electromagnetically induced signals on the receiving coil 1 and receiving coil 2 are measured respectively, and calculated The amplitude ratio and phase difference of the two signals, and then through methods such as calibration and inversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/30
Inventor 李康盛世威
Owner SHANDONG UNIV
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