EP0183816A1 - Assemblage de collier pour telemetrie - Google Patents

Assemblage de collier pour telemetrie

Info

Publication number
EP0183816A1
EP0183816A1 EP85903023A EP85903023A EP0183816A1 EP 0183816 A1 EP0183816 A1 EP 0183816A1 EP 85903023 A EP85903023 A EP 85903023A EP 85903023 A EP85903023 A EP 85903023A EP 0183816 A1 EP0183816 A1 EP 0183816A1
Authority
EP
European Patent Office
Prior art keywords
assembly
toroid
dielectric material
sleeve
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85903023A
Other languages
German (de)
English (en)
Inventor
Harlan Leon Nicholson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Genesis (uk) Ltd
Original Assignee
Genesis (uk) Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB848415409A external-priority patent/GB8415409D0/en
Application filed by Genesis (uk) Ltd filed Critical Genesis (uk) Ltd
Publication of EP0183816A1 publication Critical patent/EP0183816A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B17/003—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B17/16—Drill collars
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency

Definitions

  • This invention relates to an assembly which facilitates telemetry transmission and/or reception, such as measuring borehole data and transmitting the data to a remote (e.g. surface) location for analysis.
  • the invention when applied to a borehole, may be used at any time during the drilling of the borehole but is primarily used in providing real time transmission of large quantities of data gathered near the drill bit simult- aneously while drilling. This concept is referred to in the oil industry as measurement while drilling (MWD).
  • MWD measurement while drilling
  • the measurement while drilling concept offers substantial incentives. This concept will allow safer, more efficient, and more economical drilling of both exploration and production wells.
  • One method presently being used for the transmission of data from the borehole comprises the transmission of electromagnetic waves through the drill pipe and the earth.
  • the electromagnetic pulses carrying down hole data are input into a toroid positioned in the drill string above the drill bit.
  • the primary winding, carrying the data for transmission is wrapped around the toroid and a secondary winding is formed by the drill pipe.
  • a receiver at the surface picks up the coded magnetic pulses, decodes the data, displays the data and records the data for future use.
  • a problem which is encountered in conventional drill string toroid design is that an outer sheath which must protect the toroid windings must also provide structural integrity for the toroid. With the toroid located in the drill collar, mechanical stresses such as tension, compression, torsion and column bend will be imposed on it. The structural problem is enhanced when it is realised that the electrically conductive drill collar is attached to both ends of the toroid outer sheath. This type of structure can easily provide a path for short circuiting the data transmission to earth. It is essential to provide insulation between the toroid outer sheath and the drill collar while withstanding severe environmental loading.
  • the invention is also applicable to transmitting data from other situations.
  • One of particular interest is transmitting data from the interior of a pipeline.
  • pipeline inspection vehicles, or "pigs” capture data on magnetic tape or other recording medium, and the data is not available until the pig has emerged. There are obvious benefits in transmitting the data for real-time analysis.
  • the invention accordingly provides a telemetry assembly comprising a substantially cylindrical body having at least an annular zone of dielectric material, a toroid and a primary winding therearound located within said dielectric material in said annular zone but of lesser axial length than said annular zone, the primary winding being arranged for connection to an adjacent transmitting or receiving circuit, and a ferrous sleeve overlying the toroid and forming part of the outer surface of said body.
  • the body is of metal and the toroid is positioned in an annular recess in the body, said sleeve cooperating with said recess to define an annular space within which said toroid is located and to define axial spaces between each end of the sleeve and the shoulders of the recess, and a dielectric material filling said annular and axial spaces.
  • the body may be a drill collar in the form of an integral member, the toroid and sleeve are fabricated within the recess, and the dielectric material is a mouldable material moulded within said space so as to bond the toroid and sleeve in position.
  • the collar comprises two parts removably secured together, the dielectric material is pre-formed in two or more cooperating parts, the toroid and primary winding being embedded in one of said parts, and said parts interfitting to trap the sleeve.
  • the dielectric material is suitably a mouldable plastics material of good mechanical strength and abrasion resistance.
  • suitable materials are ptfe and glass-reinforced plastics (grp) using polyester or epoxy resins.
  • the collar is entirely of dielectric material, being a material which has suitable mechanical strength, resistance to abrasion and dielectric properties, and which can be moulded or cast.
  • dielectric material being a material which has suitable mechanical strength, resistance to abrasion and dielectric properties, and which can be moulded or cast.
  • Kevlar Trade Mark
  • Fig. 1 is a longitudinal cross-section of an assembly embodying the invention
  • Fig. 2 is a transverse cross-section on the line 2-2 of Fig. 1;
  • Fig. 3 is a perspective view of a second embodiment
  • Fig. 4 is an exploded view of the assembly of Fig. 3;
  • Fig. 5 is a longitudinal cross-section of the toroid and associated dielectric in the embodiment of Fig. 3;
  • Fig. 6 is a longitudinal cross-section of the embodiment of Fig. 3.
  • Fig. 7 is a longitudinal cross-section of another embodiment.
  • the assembly comprises a drill collar 10 which has an annular undercut in which is received a dielectric material 20, a toroid assembly 21,22 and a ferromagnetic outer sleeve 30.
  • the toroid assembly comprises a ferromagnetic cylinder 21 around which is would a primary winding 22 with turns arranged axially, which is connected to system earth on the collar 10 at 23 and via a lead 24 and fluid-to-air connector 25 to a data transmitter (not shown) .
  • the sleeve 30, which is preferably of steel, acts both as a transformer core and as a mechanical protection for the toroid.
  • the toroid assembly 21,22 and sleeve 30 are suitably made in sheet form, wrapped in position around the collar 10, and have, thdir ends butt-joined by welding or soldering to form closed shapes.
  • the dielectric material 20 is suitably grp applied by hand lay-up techniques.
  • the toroid assembly 21,22 is insulated from both the collar 10 and the sleeve 30 by layers of grp. It will be noted that the toroid assembly 21,22 and the sleeve 30 are of the same axial extent, and that these are spaced at either end from the shoulders of the collar by a substantial volume of dielectric; . these features are of importance in obtaining the full benefit of the invention.
  • the collar comprises a main body 10* and an end member screw- threadedly engageable therewith to define the annular recess
  • the dielectric comprises a main body 20* engageable butt-wise with an end member 40.
  • the toroid assembly 21,22 is moulded into the main body 20' .
  • the dielectric parts in this embodiment do not require to be moulded in situ and can thus, for example, be injection moulded from ptfe.
  • This embodiment can readily be assembled and and disassembled as indicated in the drawings. This simplifies repair, but at the expense of greater complexity and production cost in comparison with the first embodiment.
  • Fig. 7 The embodiment of Fig. 7 is similar to those described above, but with the following modifications.
  • the main drill collar 10 and annular dielectric material 20 of Fig. 1 are replaced by a unitary dielectric sleeve 70 in which the toroid assembly and outer sleeve are cast.
  • the sleeve 70 is of a material which has suitable mechanical strength, resistance to abrasion and dielectric propert ⁇ ies, and which can be moulded or cast, preferably Kevlar.
  • the toroid assembly is modified in that it comprises a ferromagnetic cylinder 21 around which a primary winding 22' extends, its turns being arranged circumferentially.
  • the above embodiments describe the invention as being particularly applicable to the transmission of data from boreholes, the collar asse ' mbly forming part of the drill string.
  • the assembly can in fact be used for telemetry in other situations.
  • One of particular interest is transmitting data from the interior of a pipeline, in which application the assembly suitably forms part of an inspection apparatus moved through the pipeline in any suitable known manner. Telemetry may be achieved by electromagnetic prop ⁇ agation through the pipeline itself or, in the case of an underwater pipeline, through the overlying water to a surface vessel.
  • the assembly of the invention can also be used for receiving data.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Remote Sensing (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Earth Drilling (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Un assemblage de télémétrie destiné à être incorporé dans une colonne de tiges de forage ou analogue comprend un collier (10) portant une bobine (22) enroulée sur un corps toroïdal ferromagnétique (21). Les spires sont positionnées dans un évidement du collier qui est rempli d'un matériau diélectrique (20). La bobine (22) est entourée d'une gaine ferromagnétique (30).
EP85903023A 1984-06-16 1985-06-13 Assemblage de collier pour telemetrie Withdrawn EP0183816A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB848415409A GB8415409D0 (en) 1984-06-16 1984-06-16 Collar assembly for downhole telemetry
GB8415409 1984-06-16
GB848429590A GB8429590D0 (en) 1984-06-16 1984-11-23 Collar assembly for telemetry
GB8429590 1984-11-23

Publications (1)

Publication Number Publication Date
EP0183816A1 true EP0183816A1 (fr) 1986-06-11

Family

ID=26287876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85903023A Withdrawn EP0183816A1 (fr) 1984-06-16 1985-06-13 Assemblage de collier pour telemetrie

Country Status (3)

Country Link
EP (1) EP0183816A1 (fr)
ES (1) ES8609864A1 (fr)
WO (1) WO1986000112A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2600171B1 (fr) * 1986-06-17 1990-10-19 Geoservices Antenne pour emetteur situe a grande profondeur
US4839644A (en) * 1987-06-10 1989-06-13 Schlumberger Technology Corp. System and method for communicating signals in a cased borehole having tubing
FR2691203A1 (fr) * 1992-05-15 1993-11-19 Mr Ind Tube auxiliaire sans raccord pour puits de forage profond.
GB0101919D0 (en) * 2001-01-25 2001-03-07 Geolink Uk Ltd Induction logging antenna
US7080699B2 (en) 2004-01-29 2006-07-25 Schlumberger Technology Corporation Wellbore communication system
CN104213911B (zh) * 2013-06-05 2017-04-12 中国石油天然气集团公司 一种电磁波随钻测量井下仪器间的绝缘连接结构及制造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354887A (en) * 1942-10-29 1944-08-01 Stanolind Oil & Gas Co Well signaling system
US2941784A (en) * 1955-07-05 1960-06-21 Atlantic Refining Co Logging while drilling
US3079549A (en) * 1957-07-05 1963-02-26 Philip W Martin Means and techniques for logging well bores
US3186222A (en) * 1960-07-28 1965-06-01 Mccullough Tool Co Well signaling system
US4181014A (en) * 1978-05-04 1980-01-01 Scientific Drilling Controls, Inc. Remote well signalling apparatus and methods
FR2492540A1 (fr) * 1980-10-17 1982-04-23 Schlumberger Prospection Dispositif pour diagraphie electromagnetique dans les forages
US4348672A (en) * 1981-03-04 1982-09-07 Tele-Drill, Inc. Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
US4578675A (en) * 1982-09-30 1986-03-25 Macleod Laboratories, Inc. Apparatus and method for logging wells while drilling
AU2907484A (en) * 1983-06-27 1985-01-03 N L Industries Inc. Drill stem logging system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8600112A1 *

Also Published As

Publication number Publication date
ES8609864A1 (es) 1986-07-16
WO1986000112A1 (fr) 1986-01-03
ES544176A0 (es) 1986-07-16

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Inventor name: NICHOLSON, HARLAN, LEON