Underground three-dimensional scanning nuclear magnetic resonance imaging instrument radio frequency antenna receiving method and device
A nuclear magnetic resonance imaging, radio frequency antenna technology, applied in the direction of electronic magnetic resonance/nuclear magnetic resonance detection, instruments, antennas, etc., can solve the problem of not having the ability to detect signals in circumferential and multi-directional sensitive areas
Inactive Publication Date: 2018-09-11
CHINA UNIV OF PETROLEUM (BEIJING)
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[0005] The embodiment of the present invention provides a radio frequency antenna receiving method and device for an underground three-dimensional scanning nuclear magnetic resonance imaging instrument, which is used to solve the problem that the existing radio frequency antenna receiving device of the nuclear magnetic resonance imaging instrument does not have the signal detection capability of the circumferential multi-directional sensitive area
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[0042] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.
[0043] The terms "comprising" and "having" and any variations thereof in the description and claims of the present invention are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further include...
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The invention provides an underground three-dimensional scanning nuclear magnetic resonance imaging instrument radio frequency antenna receiving method and device. The device comprises an array antenna for receiving echo signals, an antenna interface circuit, a receiving and amplifying circuit for amplifying the echo signals, an analog-digital conversion circuit, a signal acquisition circuit and acontrol circuit; the array antenna comprises N antenna units, N is larger than or equal to 4, and the N antenna units correspond to different circumferential sensitive areas; the array antenna, the antenna interface circuit, the receiving and amplifying circuit, the analog-digital conversion circuit and the signal acquisition circuit are sequentially connected; the four ports of the control circuit are connected with the antenna interface circuit, the receiving and amplifying circuit, the analog-digital conversion circuit and the signal acquisition circuit to control the antenna interface circuit, the receiving and amplifying circuit, the analog-digital conversion circuit and the signal acquisition circuit, the control circuit is connected with a logging ground acquisition system; and theantenna interface circuit selects one antenna element in the array antenna according to the control command of the control circuit. According to the method and the device, the signal detection of thecircumferential multi-dimensional sensitive area can be carried out.
Description
technical field [0001] The invention relates to nuclear magnetic resonance logging technology, in particular to a method and device for receiving a radio frequency antenna of an underground three-dimensional scanning nuclear magnetic resonance imaging instrument. Background technique [0002] The phenomenon of nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) was discovered in 1946, and it was soon applied in the fields of physics, chemistry, material science, life science and medicine. In the 1950s, NMR began to be applied in the oil and gas industry, initially in the field of reservoir rock physics. The nuclear magnetic resonance logging tool can use the principle of nuclear magnetic resonance to detect the formation information around the borehole, and has unique qualitative identification and quantitative evaluation capabilities of reservoir fluid. [0003] The nuclear magnetic resonance logging tool forms a static magnetic field for polarizing the spin hydro...
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Login to View More IPC IPC(8): G01V3/32H01Q23/00H01Q21/00
CPCH01Q21/00H01Q23/00G01V3/32G01R33/3621G01R33/3415G01R33/3664H01Q1/04H01Q1/521
Inventor 肖立志廖广志刘伟
Owner CHINA UNIV OF PETROLEUM (BEIJING)