公开(公告)号：US10816690B2

公开(公告)日：2020-10-27

申请号：US16238409

申请日：2019-01-02

Applicant: CHINA UNIVERSITY OF PETROLEUM—BEIJING

Inventor： Lizhi Xiao ,  Guangzhi Liao ,  Wei Liu

IPC: G01V3/32 ,  G01R33/36 ,  H01Q1/04 ,  H01Q1/52

Abstract: Provided is a radio frequency antenna receiving method and device for a downhole three-dimensional scanning nuclear magnetic resonance imager. The device comprises: an array antenna for receiving an echo signal, an antenna interface circuit, a receiving and amplifying circuit for amplifying the echo signal, an analog-to-digital conversion circuit, a signal collecting circuit and a control circuit, which are sequentially connected; the array antenna comprises N antenna units, where N≥4; four ports of the control circuit are respectively connected to the antenna interface circuit, the receiving and amplifying circuit, the analog-to-digital conversion circuit and the signal collecting circuit so as to control them, and the control circuit is connected to a logging ground acquisition system; the antenna interface circuit selects one antenna unit in the array antenna. The method and device of the present invention can perform signal detection in a circumferentially multi-directional sensitive region.

公开(公告)号：US10151808B2

公开(公告)日：2018-12-11

申请号：US15258731

申请日：2016-09-07

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： Lizhi Xiao ,  Zhe Sun ,  Guangzhi Liao ,  Sihui Luo ,  Xin Li ,  Qunjie Du ,  Wei Liu ,  Weiliang Chen ,  Jie Wang

IPC: H01Q1/38 ,  G01R33/3415 ,  G01N24/08

Abstract: The present invention provides a multi-detecting depth nuclear magnetic resonance logging tool and probe, and an antenna excitation method, the probe of nuclear magnetic resonance logging tool includes: a housing, a magnet and an antenna array apparatus; the magnet is fixedly arranged in the housing; the antenna array apparatus includes at least two groups of antenna arrays distributed along circumference of the magnet, and each group of antenna arrays include N layers of independently fed antennas; k-th layer antenna is arranged between the magnet and (k+1)-th layer antenna, k=1, 2, . . . N−1; the antenna is fixed on a support, and the support is fixedly connected to the housing. In the present invention, stratum information detection at different azimuth angles is achieved by exciting different antenna arrays, so that circumferential recognizing capability of nuclear magnetic resonance logging tool probe is improved and three-dimensional (radial, axial and circumferential) stratum detection is achieved.

公开(公告)号：US11280932B2

公开(公告)日：2022-03-22

申请号：US16420010

申请日：2019-05-22

Applicant: CHINA UNIVERSITY OF PETROLEUM—BEIJING

Inventor： Guangzhi Liao ,  Lizhi Xiao ,  Yangyang Xu ,  Wei Liu ,  Yao Wei

IPC: G01V3/32 ,  E21B47/14 ,  E21B49/00

Abstract: Provided are a main control system and a device for a nuclear magnetic resonance logging while drilling tool, the system includes: a digital signal processor, an auxiliary measurement module, a pulse signal generation module and a memory disposed in a downhole drilling tool; wherein the digital signal processor is communicatively connected to an upper computer arranged on the ground, the auxiliary measurement module and the pulse signal generation module respectively; the memory is communicatively connected to the pulse signal generation module. The main control system and a device for a nuclear magnetic resonance logging while drilling tool achieve the effect of improving the accuracy of the logging data.

公开(公告)号：US10746825B2

公开(公告)日：2020-08-18

申请号：US16238369

申请日：2019-01-02

Applicant: CHINA UNIVERSITY OF PETROLEUM—BEIJING

Inventor： Lizhi Xiao ,  Guangzhi Liao ,  Wei Liu ,  Yao Wei ,  Yangyang Xu

IPC: G01R33/36 ,  G01R33/34 ,  G01R33/3415 ,  G01N24/08 ,  G01V3/32

Abstract: Provided is an array antenna driving method and device for a three-dimensional scanning nuclear magnetic resonance imager, wherein each antenna to be operated is driven to transmit a nuclear magnetic pulse signal by receiving a control command sent by a control system; parsing the control command to generate a pulse transmission timing signal and an antenna switching control signal; processing an externally inputted high voltage signal according to the pulse transmission timing signal to output high voltage radio frequency pulses of a plurality of channels; and selecting a high voltage radio frequency pulse of at least one channel and the antenna to be operated in the nuclear magnetic resonance pulse array antenna according to the antenna switching control signal, and superposing the selected high voltage radio frequency pulse. The device of the present invention can improve multi-layer slice information detection of signals in circumferentially different azimuth zones.

公开(公告)号：US10274633B2

公开(公告)日：2019-04-30

申请号：US15258703

申请日：2016-09-07

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： Lizhi Xiao ,  Wei Liu ,  Guangzhi Liao ,  Xin Li

IPC: G01V3/32 ,  G01R33/34 ,  G01R33/36 ,  G01R33/38 ,  G01R33/3415 ,  E21B47/00

Abstract: The present invention provides a three dimensional nuclear magnetic resonance logging instrument based on multiple antenna excitation, including: a probe, an excitation transmitter and a bearing component; the probe includes magnet and multiple antennas arranged at outer side of the magnet, and the multiple antenna individually and independently provide feed; a holding cavity is provided in the bearing component, and the excitation transmitter is fixed in the holding cavity; and the excitation transmitter includes a transmitter framework and an excitation circuit; the transmitter framework and the bearing component are fixedly connected; and the excitation circuit is fixed on the transmitter framework, and is electrically connected with each of the multiple antennas for feeding the multiple antennas.

公开(公告)号：US10191178B2

公开(公告)日：2019-01-29

申请号：US15258787

申请日：2016-09-07

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： Lizhi Xiao ,  Xin Li ,  Guangzhi Liao ,  Sihui Luo ,  Zhe Sun ,  Wei Liu ,  Weiliang Chen ,  Jie Wang ,  Kuntie Liao

IPC: G01V3/32 ,  G01R33/34 ,  E21B49/00 ,  G01V3/14

Abstract: The present invention provides a three-dimensional nuclear magnetic resonance logging instrument probe, a logging instrument and an antenna excitation method, where the probe includes: a probe framework, a magnet and an antenna; four magnets are uniformly distributed along a circumference of the probe framework, the magnets are magnetized in a radial direction of the probe framework, two magnets placed opposite to each other are magnetized from outside to inside, and the other two magnets placed opposite to each other are magnetized from inside to outside; in the probe framework, each of the magnets is provided with independently fed antennas; antennas corresponding to each of the magnets comprise a left antenna provided on one side of the corresponding magnet and a right antenna provided on the other side of the corresponding magnet; the left antenna and the right antenna corresponding to each magnet are electrically connected.

公开(公告)号：US10151852B2

公开(公告)日：2018-12-11

申请号：US15258843

申请日：2016-09-07

Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING

Inventor： Lizhi Xiao ,  Guangzhi Liao ,  Xin Li ,  Feng Deng ,  Sihui Luo ,  Zhe Sun ,  Wei Liu ,  Weiliang Chen ,  Jie Wang

IPC: G01V3/32 ,  G01V3/14 ,  E21B47/024 ,  G01R33/34 ,  G01N24/08 ,  G01R33/3415 ,  G01R33/38 ,  G01R33/383

Abstract: The present invention provides a multi-azimuth nuclear magnetic resonance logging instrument and an antenna excitation method, the nuclear magnetic resonance logging instrument includes: a probe framework and a shielding layer arranged in the probe framework; a plurality of main magnets are provided above and below the shielding layer, respectively; central axes of the main magnets are parallel with each other, and distances between the central axes of each of the main magnets and a central axis of the probe framework are the same; a distance between central axes of any two main magnets is not smaller than a first preset value; and an antenna is provided at outer side of each main magnet, and a plurality of the antennas are fed independently. In the present invention, circumferential recognizing capability of the nuclear magnetic resonance logging instrument can be improved and three-dimensional (radial, axial and circumferential) stratum detection can be achieved.