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公开(公告)号：US10731459B2
公开(公告)日：2020-08-04
申请号：US16366929
申请日：2019-03-27
发明人： Aaron W. Logan , David A. Switzer , Jili Liu , Justin C. Logan , Mingdong Xu
摘要： A downhole system has a plurality of telemetry systems and a control system configured to obtain information from one or more sensors and transmit that information on one or more of the plurality of telemetry systems. The configuration of a controller may be changed so as to change which information is transmitted on a given telemetry system and how the information is to be transmitted on the given telemetry system.
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公开(公告)号：US10598000B2
公开(公告)日：2020-03-24
申请号：US15906855
申请日：2018-02-27
摘要： A method for using a downhole probe. The method comprises providing a probe, at least one vertical cross section of the probe having an area of at least pi inches squared. The method further comprises inserting the probe into a bore of a drill collar and passing a drilling fluid through the bore of drill collar at a flow velocity of less than 41 feet per second.
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公开(公告)号：US10202844B2
公开(公告)日：2019-02-12
申请号：US15435088
申请日：2017-02-16
发明人： David A. Switzer , Jili Liu , Mingdong Xu , Aaron W. Logan
摘要： Methods, techniques, and systems for transmitting a data frame of an electromagnetic (EM) telemetry signal to or from a downhole location can be performed using multi-channel transmissions in which at least two different channels at two different frequencies are used to send a long header and the data frame. At least a portion of the long header is transmitted at a first frequency, and at least a portion of the data frame and any remaining portion of the long header not transmitted at the first frequency are transmitted at one or more additional frequencies different from each other and the first frequency. In one example, only two channels are used: one channel is used to transmit all of the long header, another channel is used to transmit all of the data frame, and either of the channels is used to transmit an identifier identifying the type of the data frame.
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公开(公告)号：US20180252096A1
公开(公告)日：2018-09-06
申请号：US15906973
申请日：2018-02-27
IPC分类号： E21B47/12
摘要： A wireless communications system for a downhole drilling operation comprises surface communications equipment and a downhole telemetry tool. The surface communications equipment comprises a surface EM communications module with an EM downlink transmitter configured to transmit an EM downlink transmission at a frequency between 0.01 Hz and 0.1 Hz. The downhole telemetry tool is mountable to a drill string and has a downhole electromagnetic (EM) communications unit with an EM downlink receiver configured to receive the EM downlink transmission. The downhole EM communications unit can further comprise an EM uplink transmitter configured to transmit an EM uplink transmission at a frequency greater than 0.5 Hz, in which case the surface EM communications module further comprises an EM uplink receiver configured to receive the EM uplink transmission. More particularly, the downhole EM uplink transmitter can be configured to transmit the EM uplink transmission at a frequency that is at least ten times higher than the EM downlink transmission frequency.
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公开(公告)号：US10066475B2
公开(公告)日：2018-09-04
申请号：US15588371
申请日：2017-05-05
IPC分类号： E21B47/024 , E21B47/12 , E21B47/022 , E21B47/01
摘要： The embodiments described herein generally relate to a method and apparatus for providing a back up system of Directional and Inclination (D&I) information to be gathered and transmitted in addition to primary D&I sensors currently employed in industry. A downhole probe assembly including primary sensors, back up sensors and a controller is disclosed. The primary sensors comprise primary accelerometers and primary magnetometers configured to gather information relating to each of orthogonal axes X, Y and Z. The back up sensors comprise back up accelerometers configured to gather information relating to each of orthogonal axes X, Y and Z, the back up accelerometers being solid state accelerometers. The controller is in electrical communication with the primary sensors and the back up sensors. The controller is configured to receive and process information from the primary sensors and the back up sensors so that information from the back up accelerometers can be used when one or more of the primary accelerometers fail, which may allow drilling operations to continue despite such failure.
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公开(公告)号：US09988897B2
公开(公告)日：2018-06-05
申请号：US15668075
申请日：2017-08-03
发明人： Jili Liu , Mingdong Xu , Aaron W. Logan , David A. Switzer , Monica E. Varga , Mojtaba Kazemi Miraki
IPC分类号： E21B47/12 , H04W52/02 , H04B17/336 , H04B17/318
CPC分类号： E21B47/122 , E21B47/121 , H04B17/318 , H04B17/336 , H04Q9/00 , H04W52/0245 , H04W52/028 , H04W52/241 , H04W52/245 , Y02D70/00
摘要： An electromagnetic telemetry system adjusts telemetry parameters which may include carrier frequency, signal amplitude and/or data encoding protocol to achieve reliable data transmission and to conserve power. In some embodiments, sweep signals transmit a range of carrier frequencies and the parameters are determined in part by analyzing the received sweep signals. In some embodiments, different parameters are selected automatically based on a mode of drilling.
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公开(公告)号：US09988896B2
公开(公告)日：2018-06-05
申请号：US14925643
申请日：2015-10-28
发明人： David A. Switzer , Jili Liu , Mingdong Xu , Aaron W. Logan
CPC分类号： E21B47/122 , G08C19/14 , H04J9/00 , H04L5/06 , H04L7/06
摘要： Methods, techniques, and systems for transmitting a data frame of an electromagnetic (EM) telemetry signal to or from a downhole location can be performed using multi-channel transmissions in which at least two different channels at two different frequencies are used to send a long header and the data frame. At least a portion of the long header is transmitted at a first frequency, and at least a portion of the data frame and any remaining portion of the long header not transmitted at the first frequency are transmitted at one or more additional frequencies different from each other and the first frequency. In one example, only two channels are used: one channel is used to transmit all of the long header, another channel is used to transmit all of the data frame, and either of the channels is used to transmit an identifier identifying the type of the data frame.
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公开(公告)号：US09951603B2
公开(公告)日：2018-04-24
申请号：US14650502
申请日：2012-12-07
CPC分类号： E21B47/01 , E21B17/1007 , E21B17/1078 , E21B17/16 , E21B47/011
摘要： A method for using a downhole probe. The method comprises providing a probe, at least one vertical cross section of the probe having an area of at least pi inches squared. The method further comprises inserting the probe into a bore of a drill collar and passing a drilling fluid through the bore of drill collar at a flow velocity of less than 41 feet per second.
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公开(公告)号：US09932776B2
公开(公告)日：2018-04-03
申请号：US14770353
申请日：2014-02-28
IPC分类号： E21B17/02 , E21B17/042 , E21B17/043 , E21B17/046 , H01R4/70 , H01R13/20 , E21B17/00 , E21B47/12
CPC分类号： E21B17/003 , E21B17/042 , E21B47/122 , H01R4/70 , H01R13/20
摘要： A gap sub comprises a female member comprising a first and second plurality of apertures, and a male member comprising a first and second plurality of cavities. A plurality of non-conductive pins may be inserted through the second plurality of apertures and the second plurality of cavities, thereby locking the relative positions of the female and male members. A plurality of conductive pins may be inserted through the first plurality of apertures and the first plurality of cavities such that there are no electrical connections between the conductive pins and the male member. A dielectric material may be inserted between the male member and the conductive pins.
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公开(公告)号：US09828854B2
公开(公告)日：2017-11-28
申请号：US14740135
申请日：2015-06-15
发明人： Aaron W. Logan , Jili Liu , David A. Switzer , Justin C. Logan
CPC分类号： E21B47/187 , E21B34/06 , E21B47/06 , E21B47/18
摘要： A pressure measurement apparatus for a downhole measurement-while-drilling tool comprises a feed through connector and a pressure transducer. The feed through connector comprises a body with opposing first and second ends, at least one electrical interconnection extending axially through the body and out of both ends, and a pressure transducer receptacle in the first end and a communications bore extending from the receptacle to the second end. The pressure transducer is seated in the receptacle such that a pressure at the first end can be measured, and comprises at least one electrical contact that extends from the pressure transducer through the communication bore and out of the second end. The pressure transducer can take pressure measurements for predicting wear of a primary seal in a motor subassembly of the tool, detect a pressure-related battery failure event, and control operation of a dual pulse height fluid pressure pulse generator.
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