公开(公告)号：US20240329273A1

公开(公告)日：2024-10-03

申请号：US18417107

申请日：2024-01-19

Applicant: Univ. Electronic Science and Technology of China

Inventor： Wei CHEN ,  Xiufeng LI ,  Xu ZHANG ,  Qingshui GU ,  Ruiqing WU ,  Conglin YE ,  Jingyi LIN

IPC: G01V1/50 ,  E21B47/20 ,  E21B49/00

CPC classification number: G01V1/50 ,  E21B47/20 ,  E21B49/00

Abstract: Disclosed is a bit-symbol mapping method using multi-pulse position modulation (MPPM), which relevant to the field of signal processing. An index of each dimension of an N-order M-dimensional matrix may be a pulse position number of a MPPM(N, M) symbol. The method includes mapping integers to a super-triangular area of the N-order M-dimensional matrix and establishing a correlation between the integers and the N-order M-dimensional matrix elements. In this way, a correspondence between a bit sequence and a MPPM(N, M) symbol is established using a correspondence between the N-order M-dimensional matrix element and an index number of each dimension of the N-order M-dimensional matrix element. A mathematical expression of the number of integers mapped to each layer in each dimension of a super-triangular area of an N-order M-dimensional matrix is used to generate a lookup table TLUT.

公开(公告)号：US11885218B2

公开(公告)日：2024-01-30

申请号：US17222305

申请日：2021-04-05

Applicant: Halliburton Energy Services, Inc.

Inventor： Joni Polili Lie ,  Mukul M. Agnihotri ,  Faisal Shah

IPC: E21B47/20

CPC classification number: E21B47/20

Abstract: Downhole telemetry systems and related methods to adaptively adjust pulse waveform width through digitally controlled pulsing parameters.

公开(公告)号：US20220413178A1

公开(公告)日：2022-12-29

申请号：US17356992

申请日：2021-06-24

Applicant: Stanislav Forgang ,  Ryan Rocheleau ,  Marc Stephen Ramirez ,  Youssef Boulaknadal

Inventor： Stanislav Forgang ,  Ryan Rocheleau ,  Marc Stephen Ramirez ,  Youssef Boulaknadal

IPC: G01V3/32 ,  G01N24/08 ,  E21B47/20 ,  E21B47/13

Abstract: A device for generating oscillating signals includes an energy transfer device configured to apply an oscillating signal to a sensitive volume, and a resonant tuning circuit including the energy transfer device. The tuning circuit includes a tuning capacitor configured to cause the tuning circuit to resonate at a selected frequency, and an energy storage device. The transmitting device also includes a controller configured to apply a pulse sequence to the tuning circuit having a series of pulses, the energy storage device configured to retain electrical energy at an end of a first pulse, and discharge the electrical energy to the tuning circuit at an onset of a next pulse of the pulse sequence.

公开(公告)号：US11519264B1

公开(公告)日：2022-12-06

申请号：US17454715

申请日：2021-11-12

Applicant: CHINA PETROLEUM & CHEMICAL CORPORATION

Inventor： Jun Han ,  Sheng Zhan

IPC: E21B47/022 ,  E21B47/02 ,  G01V3/18 ,  E21B47/20 ,  E21B47/135 ,  E21B47/0228

Abstract: A method for obtaining accuracy gravity coefficients out of three orthogonally oriented accelerometer devices and a thermometer by computing, using a pre-programmed micro-control unit processor, temperature errors, bias error coefficients, sensitivity error coefficients, and orthogonality error coefficients during measurement while drilling operations. Particularly, the method uses voltage data values of the three orthogonally oriented accelerometers to compute said error coefficients which provides for zero-error positioning of the MWD tool during long-term downhole surveying as well as while facing high-shock, vibrations, and high temperatures.

公开(公告)号：US10808505B2

公开(公告)日：2020-10-20

申请号：US16221735

申请日：2018-12-17

Applicant: Prime Downhole Manufacturing LLC

Inventor： Wilson Chun-Ling Chin ,  Kamil Iftikhar

IPC: E21B47/18 ,  E21B41/00 ,  E21B47/20

Abstract: A measurement while drilling (MWD) tool includes a sensor, an encoder operably connected to the sensor and a modulator operably connected to the encoder. The modulator includes a first stator, a rotor and a second stator. The rotor is optimally positioned between the first and second stator. The use of a second stator amplifies the pressure pulse signal produced by the modulator.

公开(公告)号：US20240240555A1

公开(公告)日：2024-07-18

申请号：US18153791

申请日：2023-01-12

Applicant: Michael Simon Pogrebinsky

Inventor： Michael Simon Pogrebinsky

IPC: E21B47/20 ,  E21B21/01 ,  E21B21/08

CPC classification number: E21B47/20 ,  E21B21/01 ,  E21B21/08

Abstract: A method for downlinking communication from a surface location to a bottom hole assembly during drilling operation is provided. The method includes pumping drilling fluid through a fluid line and through a drill string to the bottom hole assembly, and generating pressure wave signals by a modulator disposed against an outside surface of the fluid line at an outside-surface location of the fluid line. The modulator is disposed entirely outside of the fluid line. The method includes detecting and receiving at the bottom hole assembly the pressure wave signals generated by the modulator, and processing and decoding the pressure wave signals with a decoder associated with the bottom hole assembly to identify downlinking command purpose and required action for controlling drilling operations.

公开(公告)号：US11802479B2

公开(公告)日：2023-10-31

申请号：US17584645

申请日：2022-01-26

Applicant: Halliburton Energy Services, Inc.

Inventor： Rashobh Rajan Sobhana

IPC: E21B47/20 ,  G01V3/18

CPC classification number: E21B47/20 ,  G01V3/18

Abstract: A telemetry system includes a downhole device configured to generate modulated pressure pulses in drilling fluid within a drill string, first and second transducers configured provide first and second telemetry signals, respectively, responsive to pressure variations in the drilling fluid, and a telemetry computer coupled to the transducers. The telemetry computer includes a processor and a memory coupled to the processor. The memory contains instructions that, when executed by the processor, cause the telemetry computer to be configured to transform the first and second telemetry signals to a time-frequency domain representation to provide first and second time-frequency telemetry signals, respectively; and apply an unmixing filter to the first and second time-frequency telemetry signals to provide an enhanced signal in the time-frequency domain. The enhanced signal has a source signal component separated from a noise component, and the first and second telemetry signals are mixed source-noise signals.

公开(公告)号：US11499420B2

公开(公告)日：2022-11-15

申请号：US17126984

申请日：2020-12-18

Applicant: Baker Hughes Oilfield Operations LLC

Inventor： Volker Peters ,  Detlef Hahn ,  Heiko Eggers ,  Heige Brand

IPC: E21B47/18 ,  E21B47/20

Abstract: Methods and systems for generating pulses in drilling fluid are described. The methods include driving rotation of a rotor relative to a stator of a pulser assembly in an oscillatory manner. The oscillatory manner includes rotating an obstructing element from a middle position to a first blocking angle position and rotating the obstructing element from the first blocking angle position to a second blocking angle position such that selective obstruction occurs. Rotation of the at least one obstructing element selectively obstructs a stator flow passage when drilling fluid is flowing through the drill string to generate a pressure pulse in the drilling fluid and the oscillatory manner is an oscillation of the obstructing element between the first blocking angle position and the second blocking angle position such that a single oscillation is between two obstructed states of the stator flow passage.

公开(公告)号：US20220098978A1

公开(公告)日：2022-03-31

申请号：US17037362

申请日：2020-09-29

Applicant: Halliburton Energy Services, Inc.

Inventor： Li Gao ,  Ravi P. Nanayakkara ,  Joni Polili Lie ,  Mukul M. Agnihotri

IPC: E21B47/20 ,  E21B34/08

Abstract: A downhole telemetry method and system are disclosed. In some embodiment, a method includes driving a pulser device based on an input data stream, wherein driving the pulser device includes generating modulated pressure pulses including modulated pulse shapes within a fluid telemetry medium. In some embodiments in which bi-modulation is utilized, the method further includes driving the pulser device including modulating pressure pulses including pulse position modulating pressure pulses.

公开(公告)号：US11098579B1

公开(公告)日：2021-08-24

申请号：US17222996

申请日：2021-04-05

Applicant: Institute of Geology and Geophysics, Chinese Academy of Sciences

Inventor： Yuntao Sun ,  Wenxuan Chen ,  Qingyun Di ,  Jian Zheng ,  Wenxiu Zhang

IPC: E21B47/125 ,  E21B47/20 ,  H04L27/12 ,  H04L1/00 ,  E21B47/013

Abstract: An electrode-type near-bit wireless short-distance transmission modulation method includes the steps of by a near-bit measuring tool, measuring parameters, and acquiring parameter information, and packing the parameter information into a data packet, and transmitting the data packet to a transmission processor part; by the transmission processor part, performing binary frequency shift keying modulation on the data packet, and according to a set transmission power and driving source power, passing the modulated data packet through an amplifying circuit and a driving circuit, and then loading the modulated data packet to positive and negative electrodes of a transmitter; and by the positive and negative electrodes of the transmitter, transmitting the modulated data packet passed through the amplifying circuit and the driving circuit to a receiver, so as to realize electrode-type wireless short-distance transmission modulation.