US2301783A - Insulated electrical conductor for pipes - Google Patents

Insulated electrical conductor for pipes Download PDF

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US2301783A
US2301783A US322937A US32293740A US2301783A US 2301783 A US2301783 A US 2301783A US 322937 A US322937 A US 322937A US 32293740 A US32293740 A US 32293740A US 2301783 A US2301783 A US 2301783A
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ring
screws
tool joint
annular ring
conducting
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US322937A
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Robert E Lee
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/028—Electrical or electro-magnetic connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/523—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases for use under water
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/60—Connections between or with tubular conductors
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/028—Electrical or electro-magnetic connections
    • E21B17/0285—Electrical or electro-magnetic connections characterised by electrically insulating elements

Definitions

  • This invention relates to insulated electrical conductors for pipes, and it has particular rerl erence to an apparatus whereby an electrical cir cuit may be completed between a drilling bit and the derrick floor and suitably insulated from the metallic parts of the drill stem, in a system such as described in my U. 55. Letters Patent No. 2,196,- 314, April 9, 1940, for Method of measuring the inherent terrestrial magnetism of the earths crust.
  • the principal object of the invention is to provide an electrical coupling through tool joints on a drill stern, by means of which electrical contacts may be during the normal operation of making up or breaking the tool joints when going in or coming out of the bore hole with the drill stem.
  • Another object is to provide an electrical coupling so arranged that a positive electrical connection wil be made between corresponding conductors when the pipe sections are made up to full shoulder.
  • Yet another object is to provide means whereby electrical contacts may be made and maintained between non-rotating conductors at the surface of the earth and corresponding conductors so positioned within the drill stem that they will rotate with the rotation of the drill stem assembly.
  • a still further object is to provide effective insulating means for the electrical contacts adjacent the tool joints, which means are resilient and hig ly eiiective in excluding liquids and other foreign material from the electrical contacts.
  • Figure 1 is a fragmentary View in vertical cros section of the means for making electrical contact from the wires through the box and pin of a tool joint
  • FIG. 2 is a view taken on th line 2--2 on Figure 1,
  • Figure 3 is a fragmentary view in elevation of the companion assembly to Figure l and,
  • Figure 4 is a view taken on the line 4-4 on Figure 3.
  • annular ring 5! formed shown, serves to house the conducting wires of the circuits. These wires are electrically connected to metallic screws 52.
  • is locked in a predetermined position relative to the tool joint pin section 4?.
  • An annular ring 53 is positioned within the box section of the tool joint, and is locked against rotary motion thereto in a predetermined position, but is free to move longitudinally thereto within fixed limits.
  • Metallic screw 5d serve to make electrical contact with their respective wires of the circuits.
  • the screws 52 and 5t serve to effect contact with conducting segments 55 and 56, reg ectively. These segments are embedded within the rings 5! and 53. The purpose of these segments is to provide ample contact in a predetermined position when the tool joint is made up to full shoulder.
  • the annular ring 53 is mounted above an annular ring 51, which ring is comprised of a resilient and insulating material. This ring further serves as a sealing means.
  • desired contacts may be made by the normal operations of screwin up the tool joint to full shoulder and the resiliency of the ring 5'! is effective in urging longitudinally the ring 53 which ring contacts under pressure the ring 5-! when the tool joint is screwed up to full shoulder.
  • a pin 0 is positioned as shown in Figure 3 to prevent relative rotation between the member 48 and the member 4811. Interposed between these members is a packing ring at.
  • resilient sockets 5m and 53a are provided as shown.
  • the purpose of these resilient sockets is to insure positive contacts at all times between the respective wire conductors when the tool joint is made up to full shoulder.
  • non-conducting material may be used throughout the entire construction with the exception of the conducting elements, if so desired.
  • apparatus for completing an electrical circuit between a tool joint pin section and a tool joint box section of the drill stem comprising an annular ring disposed in the tool joint pin section at the end portion thereof and locked in a predetermined position therein, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of conducting wires extending longitudinally from said annular ring in the tool joint pin section through the drill stem in sealed-01f relation from the central portion thereof, each of said wires having one end portion thereof extending into one of said threaded recesses of said ring, a plurality of metallic screws each engaging in one of said threaded recesses to make electrical contact with the conducting wire therein, a plurality of spaced apart conducting segments carried by said annular ring, each in contact with one of said screws, the said segments being equidistant from the center point of said annular ring, a second annular ring disposed in a predetermined position in the tool joint
  • apparatus for completing an electrical circuit between a tool joint pin section and tool joint box section of the drill stem comprising an annular ring disposed in the tool joint pin section at the end portion thereof and locked in a predetermined position therein, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses, each of said screws having a portion of its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires extending longitudinally from said annular ring in the tool joint pin section through the drill stern in sealed off relation from the central portion thereof, each of said wires having one end thereof terminating in the resilient means in the recessed portion in the shank of each of said metallic screws, said conducting wires electrically contacting said metallic screws, a plurality of spaced apart conducting segments carried by said annular ring each in contact with one of said screws, the said segments being e
  • Apparatus for completing an electrical circuit between pipe sections in threaded engagement comprising, an annular ring locked in the end portion of one pipe section, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses, each of said screws having a portion oi its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires each terminating in the resilient means in each recessed screw shank portion and in electrical contact with said screws, conducting se ments carried by said annular ring, each in contact with one of said screws, a second annular ring disposed in the end portion of the engaging pipe section and locked against relative rotary movement therewith, said second ring being adapted to have limited longitudinal movement, said second ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses in the said second ring, each of said screws
  • annular ring locked in the end portion of the section, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses, each of said screws having a portion of its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires each terminating in the resilient means in each recessed screw shank portion and in electrical contact with said screws, and conducting segments carried by said annular ring each in Contact with one of said screws.

Description

Nov. 10, 1942. R 5 LEE 2,301,783
INSULATED ELECTRICAL CONDUCTOR FOR PIPES Filed March' 8, 1940 Patented Nov. 10, 1942 UNITED STATES FATENT OFFICE INSULATED ELECTRICAL CONDUCTOR FOR PIPES 4 Claims.
This invention relates to insulated electrical conductors for pipes, and it has particular rerl erence to an apparatus whereby an electrical cir cuit may be completed between a drilling bit and the derrick floor and suitably insulated from the metallic parts of the drill stem, in a system such as described in my U. 55. Letters Patent No. 2,196,- 314, April 9, 1940, for Method of measuring the inherent terrestrial magnetism of the earths crust.
The principal object of the invention is to provide an electrical coupling through tool joints on a drill stern, by means of which electrical contacts may be during the normal operation of making up or breaking the tool joints when going in or coming out of the bore hole with the drill stem.
Another object is to provide an electrical coupling so arranged that a positive electrical connection wil be made between corresponding conductors when the pipe sections are made up to full shoulder.
Yet another object is to provide means whereby electrical contacts may be made and maintained between non-rotating conductors at the surface of the earth and corresponding conductors so positioned within the drill stem that they will rotate with the rotation of the drill stem assembly.
A still further object is to provide effective insulating means for the electrical contacts adjacent the tool joints, which means are resilient and hig ly eiiective in excluding liquids and other foreign material from the electrical contacts.
Referring to the drawing:
Figure 1 is a fragmentary View in vertical cros section of the means for making electrical contact from the wires through the box and pin of a tool joint,
Figure 2 is a view taken on th line 2--2 on Figure 1,
Figure 3 is a fragmentary view in elevation of the companion assembly to Figure l and,
Figure 4 is a view taken on the line 4-4 on Figure 3.
In continuing with a more detailed description of the drawing, it will be understood that by means of the structure herein described and illustrated, sections of drill stem may be made up or taken apart without additional effort, and the electrical circuits are substantially and effectively insulated and sealed throughout the drill stem from the effects of the metallic parts as well as the circulating medium. Moreover, the circuits herein described are insulated and are completed without the aid of the earth as a ground. The tool joint pin section and the tool joint box section assemblies are illustrated in Figures 1 to 4 and by means of the assemblies illustrated and to be hereinafter described, the various electrical circuits which include wires M and it are insulate-d, sealed and completed.
illustrated in Figure 1 an annular ring 5!, formed shown, serves to house the conducting wires of the circuits. These wires are electrically connected to metallic screws 52. The ring 5| is locked in a predetermined position relative to the tool joint pin section 4?.
An annular ring 53 is positioned within the box section of the tool joint, and is locked against rotary motion thereto in a predetermined position, but is free to move longitudinally thereto within fixed limits. Metallic screw 5d serve to make electrical contact with their respective wires of the circuits. The screws 52 and 5t serve to effect contact with conducting segments 55 and 56, reg ectively. These segments are embedded within the rings 5! and 53. The purpose of these segments is to provide ample contact in a predetermined position when the tool joint is made up to full shoulder.
The annular ring 53 is mounted above an annular ring 51, which ring is comprised of a resilient and insulating material. This ring further serves as a sealing means. Thus it is obvious that desired contacts may be made by the normal operations of screwin up the tool joint to full shoulder and the resiliency of the ring 5'! is effective in urging longitudinally the ring 53 which ring contacts under pressure the ring 5-! when the tool joint is screwed up to full shoulder.
It will be noted that a pin 0 is positioned as shown in Figure 3 to prevent relative rotation between the member 48 and the member 4811. Interposed between these members is a packing ring at.
Within the annular insulated rings 5] and 53 resilient sockets 5m and 53a are provided as shown. The purpose of these resilient sockets is to insure positive contacts at all times between the respective wire conductors when the tool joint is made up to full shoulder.
It will be understood that non-conducting material may be used throughout the entire construction with the exception of the conducting elements, if so desired.
Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.
What is claimed is:
In a drill stem having a plurality of joined together sections, apparatus for completing an electrical circuit between a tool joint pin section and a tool joint box section of the drill stem comprising an annular ring disposed in the tool joint pin section at the end portion thereof and locked in a predetermined position therein, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of conducting wires extending longitudinally from said annular ring in the tool joint pin section through the drill stem in sealed-01f relation from the central portion thereof, each of said wires having one end portion thereof extending into one of said threaded recesses of said ring, a plurality of metallic screws each engaging in one of said threaded recesses to make electrical contact with the conducting wire therein, a plurality of spaced apart conducting segments carried by said annular ring, each in contact with one of said screws, the said segments being equidistant from the center point of said annular ring, a second annular ring disposed in a predetermined position in the tool joint box section and locked against relative rotary movement therewith, said second ring being adapted to have limited longitudinal movement, said second annular ring being provided with a plurality of spaced apart threaded recesses, a plurality of conducting wires extending longitudinally from said annular ring in the tool joint box section through the drill stem in sealed off relation from the central portion thereof, each of said wires having one end portion thereof extending into one of said threaded recesses of said second annular ring, a plurality of metallic screws each engagin in one of said threaded recesses in said second ring to make electrical contact with the conducting wire therein, a plurality of spaced apart conducting segments carried by said second annular ring at a point equidistant from the center point of said second ring, each in contact with one of said screws, resilient means positioned in said tool joint box section to exert pressure against said second ring when the tool joint pin section and tool joint box section are screwed up to full shoulder, whereby the conducting segments carried by one ring each contacts its corresponding segment carried by the other ring.
2. In a drill stem having a plurality of joined together sections, apparatus for completing an electrical circuit between a tool joint pin section and tool joint box section of the drill stem comprising an annular ring disposed in the tool joint pin section at the end portion thereof and locked in a predetermined position therein, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses, each of said screws having a portion of its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires extending longitudinally from said annular ring in the tool joint pin section through the drill stern in sealed off relation from the central portion thereof, each of said wires having one end thereof terminating in the resilient means in the recessed portion in the shank of each of said metallic screws, said conducting wires electrically contacting said metallic screws, a plurality of spaced apart conducting segments carried by said annular ring each in contact with one of said screws, the said segments being equidistant from the center point of said annular ring, a second annular ring disposed in a predetermined position in the tool joint box section and locked against relative rtary movement therewith, said second ring being adapted to have limited longitudinal movement, said second annular ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses in said second annular ring, each of said screws having a portion of its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires extending longitudinally from said annular ring in the tool joint box section through the drill stem in sealed off relation from the central portion thereof, each of said wires having one end thereof terminatin in the resilient means in the recessed portion in the shank of each of said metallic screws, said second-mentioned conducting wires electrically contacting said second-mentioned metallic screws, a plurality of spaced apart conducting segments carried by said second annula ring at a point equidistant from the center point of said second ring, each in contact with one of said screws, resilient means positioned in said tool joint box section to exert pressure against said second ring when the tool joint pin section and tool joint box section are screwed up to full shoulder, whereby the conducting segments carried by one ring each contacts its corresponding segment carried by the other ring.
3. Apparatus for completing an electrical circuit between pipe sections in threaded engagement comprising, an annular ring locked in the end portion of one pipe section, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses, each of said screws having a portion oi its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires each terminating in the resilient means in each recessed screw shank portion and in electrical contact with said screws, conducting se ments carried by said annular ring, each in contact with one of said screws, a second annular ring disposed in the end portion of the engaging pipe section and locked against relative rotary movement therewith, said second ring being adapted to have limited longitudinal movement, said second ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses in the said second ring, each of said screws having a portion of its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of con ducting wires each terminating in the resilient means in each recessed screw shank portion and in electrical contact with said screws, conducting segments carried by said second annular ring, each in contact with one of said screws, resilient means positioned in said second mentioned pipe section to exert pressure against said second mentioned annular ring when both pipe sections are screwed up to full shoulder, whereby the conducting segments carried by one ring each contact its corresponding segment carried by the other ring.
4. In a tube section, an annular ring locked in the end portion of the section, said ring being provided with a plurality of spaced apart threaded recesses, a plurality of metallic screws each engaging in one of said threaded recesses, each of said screws having a portion of its shank recessed, resilient means disposed in each recessed shank portion of said screws, a plurality of conducting wires each terminating in the resilient means in each recessed screw shank portion and in electrical contact with said screws, and conducting segments carried by said annular ring each in Contact with one of said screws.
ROBERT E. LEE.
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Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531120A (en) * 1947-06-02 1950-11-21 Harry L Feaster Well-drilling apparatus
US2750569A (en) * 1952-01-08 1956-06-12 Signal Oil & Gas Co Irreversible tool joint and electrical coupling for use in wells
US2906502A (en) * 1954-03-24 1959-09-29 Edward W Smith Underwater earth boring mechanism
US3253245A (en) * 1965-03-05 1966-05-24 Chevron Res Electrical signal transmission for well drilling
US3422914A (en) * 1966-05-05 1969-01-21 Robert L Pomeroy Flexible drillstem
US3452316A (en) * 1965-03-22 1969-06-24 Itt Peripheral threaded tang quick-disconnect umbilical connector
US4176894A (en) * 1978-01-30 1979-12-04 Godbey Josiah J Internal electrical interconnect coupler
US4591226A (en) * 1983-01-31 1986-05-27 Nl Industries, Inc. Annular electrical connectors for drill string
US4605268A (en) * 1982-11-08 1986-08-12 Nl Industries, Inc. Transformer cable connector
US5236048A (en) * 1991-12-10 1993-08-17 Halliburton Company Apparatus and method for communicating electrical signals in a well, including electrical coupling for electric circuits therein
US6123561A (en) * 1998-07-14 2000-09-26 Aps Technology, Inc. Electrical coupling for a multisection conduit such as a drill pipe
US6670880B1 (en) 2000-07-19 2003-12-30 Novatek Engineering, Inc. Downhole data transmission system
US6717501B2 (en) 2000-07-19 2004-04-06 Novatek Engineering, Inc. Downhole data transmission system
US20040113808A1 (en) * 2002-12-10 2004-06-17 Hall David R. Signal connection for a downhole tool string
US20040145492A1 (en) * 2000-07-19 2004-07-29 Hall David R. Data Transmission Element for Downhole Drilling Components
US20040150532A1 (en) * 2003-01-31 2004-08-05 Hall David R. Method and apparatus for transmitting and receiving data to and from a downhole tool
US20040150533A1 (en) * 2003-02-04 2004-08-05 Hall David R. Downhole tool adapted for telemetry
US20040164838A1 (en) * 2000-07-19 2004-08-26 Hall David R. Element for Use in an Inductive Coupler for Downhole Drilling Components
US20040164833A1 (en) * 2000-07-19 2004-08-26 Hall David R. Inductive Coupler for Downhole Components and Method for Making Same
US6799632B2 (en) 2002-08-05 2004-10-05 Intelliserv, Inc. Expandable metal liner for downhole components
US20040219831A1 (en) * 2003-01-31 2004-11-04 Hall David R. Data transmission system for a downhole component
US20040221995A1 (en) * 2003-05-06 2004-11-11 Hall David R. Loaded transducer for downhole drilling components
US20040246142A1 (en) * 2003-06-03 2004-12-09 Hall David R. Transducer for downhole drilling components
US20040244964A1 (en) * 2003-06-09 2004-12-09 Hall David R. Electrical transmission line diametrical retention mechanism
US20050001735A1 (en) * 2003-07-02 2005-01-06 Hall David R. Link module for a downhole drilling network
US20050001736A1 (en) * 2003-07-02 2005-01-06 Hall David R. Clamp to retain an electrical transmission line in a passageway
US20050001738A1 (en) * 2003-07-02 2005-01-06 Hall David R. Transmission element for downhole drilling components
US20050045339A1 (en) * 2003-09-02 2005-03-03 Hall David R. Drilling jar for use in a downhole network
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US20050067159A1 (en) * 2003-09-25 2005-03-31 Hall David R. Load-Resistant Coaxial Transmission Line
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US20050115717A1 (en) * 2003-11-29 2005-06-02 Hall David R. Improved Downhole Tool Liner
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US20080003894A1 (en) * 2006-07-03 2008-01-03 Hall David R Wiper for Tool String Direct Electrical Connection
US20080110638A1 (en) * 2006-11-14 2008-05-15 Hall David R Power and/or Data Connection in a Downhole Component
US20080166917A1 (en) * 2007-01-09 2008-07-10 Hall David R Tool String Direct Electrical Connection
US20080202765A1 (en) * 2007-02-27 2008-08-28 Hall David R Method of Manufacturing Downhole Tool String Components
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US20090267790A1 (en) * 2008-04-24 2009-10-29 Hall David R Changing Communication Priorities for Downhole LWD/MWD Applications
US20110048692A1 (en) * 2007-06-08 2011-03-03 Intelliserv Llc Repeater for wired pipe
US8049506B2 (en) 2009-02-26 2011-11-01 Aquatic Company Wired pipe with wireless joint transceiver
US8264369B2 (en) 2005-05-21 2012-09-11 Schlumberger Technology Corporation Intelligent electrical power distribution system
US8519865B2 (en) 2005-05-21 2013-08-27 Schlumberger Technology Corporation Downhole coils
US10090624B1 (en) 2018-01-03 2018-10-02 Jianying Chu Bottom hole assembly tool bus system
US10342958B2 (en) 2017-06-30 2019-07-09 Abbott Cardiovascular Systems Inc. System and method for correcting valve regurgitation

Cited By (96)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531120A (en) * 1947-06-02 1950-11-21 Harry L Feaster Well-drilling apparatus
US2750569A (en) * 1952-01-08 1956-06-12 Signal Oil & Gas Co Irreversible tool joint and electrical coupling for use in wells
US2906502A (en) * 1954-03-24 1959-09-29 Edward W Smith Underwater earth boring mechanism
US3253245A (en) * 1965-03-05 1966-05-24 Chevron Res Electrical signal transmission for well drilling
US3452316A (en) * 1965-03-22 1969-06-24 Itt Peripheral threaded tang quick-disconnect umbilical connector
US3422914A (en) * 1966-05-05 1969-01-21 Robert L Pomeroy Flexible drillstem
US4176894A (en) * 1978-01-30 1979-12-04 Godbey Josiah J Internal electrical interconnect coupler
US4605268A (en) * 1982-11-08 1986-08-12 Nl Industries, Inc. Transformer cable connector
US4591226A (en) * 1983-01-31 1986-05-27 Nl Industries, Inc. Annular electrical connectors for drill string
US5236048A (en) * 1991-12-10 1993-08-17 Halliburton Company Apparatus and method for communicating electrical signals in a well, including electrical coupling for electric circuits therein
US6123561A (en) * 1998-07-14 2000-09-26 Aps Technology, Inc. Electrical coupling for a multisection conduit such as a drill pipe
US6670880B1 (en) 2000-07-19 2003-12-30 Novatek Engineering, Inc. Downhole data transmission system
US6717501B2 (en) 2000-07-19 2004-04-06 Novatek Engineering, Inc. Downhole data transmission system
US20040104797A1 (en) * 2000-07-19 2004-06-03 Hall David R. Downhole data transmission system
US20040145492A1 (en) * 2000-07-19 2004-07-29 Hall David R. Data Transmission Element for Downhole Drilling Components
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