WO1993018277A1 - A tractor for advancing processing and measuring equipment in a borehole - Google Patents

A tractor for advancing processing and measuring equipment in a borehole Download PDF

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Publication number
WO1993018277A1
WO1993018277A1 PCT/DK1993/000092 DK9300092W WO9318277A1 WO 1993018277 A1 WO1993018277 A1 WO 1993018277A1 DK 9300092 W DK9300092 W DK 9300092W WO 9318277 A1 WO9318277 A1 WO 9318277A1
Authority
WO
WIPO (PCT)
Prior art keywords
tractor
motor
borehole
battery
converter
Prior art date
Application number
PCT/DK1993/000092
Other languages
French (fr)
Inventor
Jørgen HALLUNDBAEK
Original Assignee
Htc A/S
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
Application filed by Htc A/S filed Critical Htc A/S
Priority to AU38883/93A priority Critical patent/AU3888393A/en
Publication of WO1993018277A1 publication Critical patent/WO1993018277A1/en

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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/30—Deferred-action cells
    • H01M6/36—Deferred-action cells containing electrolyte and made operational by physical means, e.g. thermal cells

Definitions

  • the invention concerns a hydraulically driven tractor for advancing processing and/or measuring equipment in a pre- drilled hole in a subterranean formation, comprising a section filled with hydraulic oil and containing a hydraulic pump for the hydraulic system of the tractor, an electric motor for operating the pump and a battery for energizing the motor.
  • a known method of solving this problem comprises the use of a thin-walled steel pipe wound on a drum and pressur- ized to obtain a sufficiently great stiffness.
  • a natural solution might comprise using a self-propelling tractor of the type which is described in the Applicant's international patent application PCT/DK89/00213, for pull- ing or pushing the measuring equipment through the borehole.
  • This tractor is intended to exert the necessary pressure on a drill bit while pulling the drill string after it in the drilled hole, and it thus has a consider- able traction force.
  • the wheels of the tractor are pressed against the wall of the borehole and are caused to rotate by means of a hydraulic system having a hydraulic pump, which is normally driven by a mud motor when the tractor is used in connection with a drilling operation. If the tractor is to be used solely for advancing measuring tools in the borehole, no drilling mud is available for driving a mud motor, and instead this may expediently be replaced by an electric motor.
  • the power supply for such an electric motor may e.g. be obtained from the surface via a cable which, however, is usually not capable of transferring a power greater than about 500 watts, partly because the cable is wound on a drum, partly because it offers great resistence owing to its length.
  • a considerable voltage drop must thus be expected along the cable, so that an applied voltage of 600 volts at the surface may be reduced to 150 volts down in the borehole where the tools are present.
  • an applied voltage of 600 volts at the surface may be reduced to 150 volts down in the borehole where the tools are present.
  • a solution to these problems might be that the tractor brought its own power supply in the form of a battery which, however, cannot, or only with great difficulty, operate directly under the extremely servere working con ⁇ ditions in the borehole, and a battery supplying DC is not useful as a power source for an electric motor which is to be capable of working in the same difficult environment.
  • the new and unique features of the invention remedying these drawbacks are that the motor is an open AC motor, that a converter is inserted between the motor and the battery for converting the DC of the battery to AC, and that the battery and the converter are incorporated in an air-filled pressure container.
  • a control relay may advantageously be incor ⁇ porated in the pressure container to start and stop the motor via signals through the cable from the surface, as desire .
  • fig. 1 schematically shows a fraction of a vertical section through a subterranean formation with a borehole in which a self-propelling tractor pulls a number of measuring tools
  • fig. 2 schematically shows the tractor of fig. 1 on an enlarged scale
  • fig. 3 shows a fraction of a section for the tractor of figs. 1 and 2 with its power assembly.
  • Fig. 1 shows a subterranean formation 1 with a borehole 2, which initially extends vertically down into the formation and then through a bend horizontally.
  • a tractor 4 drives in the borehole, pulling a trail 5 of three hooked-up measuring tools.
  • a tower 6 with a drum 7 is mounted on the surface 3 and on the borehole 2, a wireline 8, whose lowermost end is connected with the measuring tool trail 5, being wound on said drum.
  • the wireline 8 is in turn connected via an electric connection 9 with a measuring station, which, in this case, is in the form of a vehicle containing the necessary means for recording and inter ⁇ preting the measurement signals received from the borehole.
  • Fig. 2 is an enlarged view of the actual tractor 4 with a portion of the front part of the trail 5 being indicated in dashed lines.
  • the tractor 4 substantially consists of a front traction section 11 and a rear power section 12.
  • the traction section 11 may e.g. be arranged like the appara- tus described in the Applicant's previously mentioned international patent application PCT/DK89/00213, it being observed that the invention can be used in connection with any appartus of this type.
  • the traction section 11 is self-propelling and has wheels 13 capable of running on the wall 14 of the borehole. The wheels are driven by a hydraulic system which likewise keeps the wheels pressed against the wall of the borehole, so that they can trans ⁇ fer the necessary traction force to it.
  • Fig. 3 shows an enlarged section through the power section 12 of the tractor. Outwardly this has a wall 15 and is filled with hydraulic oil under pressure, which may e.g. be 1300 bars in deep boreholes.
  • a compensator (not shown), which is of a known type and will therefore not be mentioned more fully here, is provided in the power sec ⁇ tion to equalize the pressure with respect to the sur ⁇ roundings.
  • the power section comprises a hydraulic pump 16 inserted with hydraulic pipes 17 into the hydraulic cir ⁇ cuit of the traction section 11 to the wheels 13.
  • the hydraulic pump 16 is driven via a shaft 18 by an electric motor 19.
  • a battery 20 serves to energize the motor 19.
  • the power section is connected with the measuring tools and measuring station on the surface via a wire 21 having the necessary electric cables 22, which are run into a cable distributor 23 and from this via other electric cables 24 to optional measuring tools arranged in front of the tractor.
  • the battery is connected by electric cables 25, 26 and 27, respectively, to the electric motor 19 via an electric converter 28 and a control relay 29, which is in turn connected with the measuring station 10 on the surface via a control line 30, the cable distributor 23 and the electric cables 22.
  • the power section 12 is filled with hydrau ⁇ lic oil under a very high pressure, which may be up to 1300 bars, and it will therefore not be expedient to use a fully encapsulated electric motor whose shaft lead-in will have difficulty in maintaining a tight seal against the huge pressure difference.
  • the electric motor 19 is there ⁇ fore of an open design and interiorly completely filled with hydraulic oil.
  • a DC motor is not suitable for working with the commutator thus immersed in oil, and instead an AC motor is used without a commutator.
  • the DC current from the battery 20 is therefore converted to AC current in the converter 28 before being fed to the electric motor 19.
  • the battery 20, the converter 28 and the control relay 29 are moreover encapsulated in an air-filled pressure con ⁇ tainer 31, since these electric components cannot stand being exposed in the hydraulic oil because of i.a. the high pressure in it.
  • a tractor for an 8 1/2" borehole may typically have the following specifications:
  • the above-mentioned tractor will be capable of pulling 20 to 30 meters of measuring tools as well as a minimum of
  • the tractor drives for- wardly in the borehole at a constant speed, irrespective of the load, so that the wireline correspondingly runs in the hole at a constant rate over the distance in which the tractor is active.
  • Normal down rate of the standard measuring tools is about 3000 m/h, and a normal retraction rate with the wireline is about 600 m/h.
  • the speed of the tractor is expediently fixed at 1000 m/h to limit the power requirement.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics (AREA)
  • Earth Drilling (AREA)

Abstract

A hydraulically driven tractor (4) serves to advance processing and/or measuring equipment (5) in subterranean formation (1). The tractor (4) comprises a section (12) which is filled with hydraulic oil and contains a hydraulic pump (16) for the hydraulic system (17) of the tractor, an electric motor (19) for operating the pump (16) and a battery (20) for energizing the motor (19). The motor (19) is an open AC motor, and a converter (28) for converting the DC current from the battery to AC current is inserted between the motor and the battery (20). The battery (20) and the converter (28) are incorporated in an air-filled pressure container (31). The tractor is suitable for working under the extremely high temperatures and pressures which prevail in a deep borehole. Considerable economic and time benefits are obtained by using the tractor instead of a drill string for advancing the measuring tools in the borehole.

Description

A tractor for advancing processing and measuring equipment in a borehole
The invention concerns a hydraulically driven tractor for advancing processing and/or measuring equipment in a pre- drilled hole in a subterranean formation, comprising a section filled with hydraulic oil and containing a hydraulic pump for the hydraulic system of the tractor, an electric motor for operating the pump and a battery for energizing the motor.
Boreholes for exploitation of oil and gas frequently extend many kilometers into the underground to reach and penetrate the oil and gas bearing strata. Information for the planning and control of the production must be ob¬ tained from these not very accessible regions deep below the surface where extremely high temperatures and pres¬ sures prevail. This information is i.a. to tell about the type of the formation, its porosity and permeability as well as content of oil, gas and water, and also various tasks may have to be performed, such as perforation of an existing casing and operation of valves in it.
With this end in view an abundant range of equipment has been developed in the course of time in the form of measuring tools and instruments, which are capable of resisting the high temperatures and pressures in a deep borehole, and which moreover have a configuration such that they can pass through it. Generally, a plurality of interconnected tools having a rather considerable overall length of frequently about 20 to 30 meters and a weight of e.g. 1500 kg are simultaneously passed down into the borehole. Equipment of this type can readily be lowered in a wire line solely under the action of gravity, when the borehole extends vertically or with a minor inclination with respect to the vertical, but in case of greater inclinations above about 60° the equipment settles on the bottom of the borehole. This situation occurs frequently, since many of the interesting strikes are present precisely in the more or less horizontally extending strata in the underground.
A known method of solving this problem comprises the use of a thin-walled steel pipe wound on a drum and pressur- ized to obtain a sufficiently great stiffness. By succes¬ sively unwinding this steel pipe from the drum and sub¬ jecting it to a pressure force equipment of the above- mentioned type can be pushed a distance of between 500 and 900 meters into a horizontal borehole.
However, with the advanced technology used today the boreholes are very frequently drilled with a considerably greater length. In these cases it is common to use the actual drill string for advancing the equipment in the borehole. The equipment is then threaded on to the end of the drill pipes, following which the drill string is assembled. The electric wires, which connect the instru¬ ments with the station on the surface, extend on the outer side of the drill string and are run into the various instruments via inserted intermediate pipes in the drill string. The equipment can be moved relatively far into a horizontal borehole by means of this method, but on the other hand the process is cumbersome and slow. With a borehole having an overall length of 5000 meters, of which half extends with an inclination of above 60° with respect to the vertical, the time spent will thus typically be about 24 hours.
A natural solution might comprise using a self-propelling tractor of the type which is described in the Applicant's international patent application PCT/DK89/00213, for pull- ing or pushing the measuring equipment through the borehole. This tractor is intended to exert the necessary pressure on a drill bit while pulling the drill string after it in the drilled hole, and it thus has a consider- able traction force. The wheels of the tractor are pressed against the wall of the borehole and are caused to rotate by means of a hydraulic system having a hydraulic pump, which is normally driven by a mud motor when the tractor is used in connection with a drilling operation. If the tractor is to be used solely for advancing measuring tools in the borehole, no drilling mud is available for driving a mud motor, and instead this may expediently be replaced by an electric motor.
The power supply for such an electric motor may e.g. be obtained from the surface via a cable which, however, is usually not capable of transferring a power greater than about 500 watts, partly because the cable is wound on a drum, partly because it offers great resistence owing to its length. In case of long boreholes a considerable voltage drop must thus be expected along the cable, so that an applied voltage of 600 volts at the surface may be reduced to 150 volts down in the borehole where the tools are present. To this should be added that owing to the safety of the personnel it is a requirement that only relatively small voltages and current intensities are used.
A solution to these problems might be that the tractor brought its own power supply in the form of a battery which, however, cannot, or only with great difficulty, operate directly under the extremely servere working con¬ ditions in the borehole, and a battery supplying DC is not useful as a power source for an electric motor which is to be capable of working in the same difficult environment. The new and unique features of the invention remedying these drawbacks are that the motor is an open AC motor, that a converter is inserted between the motor and the battery for converting the DC of the battery to AC, and that the battery and the converter are incorporated in an air-filled pressure container.
Furthermore, a control relay may advantageously be incor¬ porated in the pressure container to start and stop the motor via signals through the cable from the surface, as desire .
The invention will be explained more fully by the follow¬ ing description of an embodiment, which just serves as an example, with reference to the drawing, in which
fig. 1 schematically shows a fraction of a vertical section through a subterranean formation with a borehole in which a self-propelling tractor pulls a number of measuring tools,
fig. 2 schematically shows the tractor of fig. 1 on an enlarged scale, and
fig. 3 shows a fraction of a section for the tractor of figs. 1 and 2 with its power assembly.
Fig. 1 shows a subterranean formation 1 with a borehole 2, which initially extends vertically down into the formation and then through a bend horizontally. A tractor 4 drives in the borehole, pulling a trail 5 of three hooked-up measuring tools. A tower 6 with a drum 7 is mounted on the surface 3 and on the borehole 2, a wireline 8, whose lowermost end is connected with the measuring tool trail 5, being wound on said drum. The wireline 8 is in turn connected via an electric connection 9 with a measuring station, which, in this case, is in the form of a vehicle containing the necessary means for recording and inter¬ preting the measurement signals received from the borehole.
Fig. 2 is an enlarged view of the actual tractor 4 with a portion of the front part of the trail 5 being indicated in dashed lines. The tractor 4 substantially consists of a front traction section 11 and a rear power section 12. The traction section 11 may e.g. be arranged like the appara- tus described in the Applicant's previously mentioned international patent application PCT/DK89/00213, it being observed that the invention can be used in connection with any appartus of this type. The traction section 11 is self-propelling and has wheels 13 capable of running on the wall 14 of the borehole. The wheels are driven by a hydraulic system which likewise keeps the wheels pressed against the wall of the borehole, so that they can trans¬ fer the necessary traction force to it.
Fig. 3 shows an enlarged section through the power section 12 of the tractor. Outwardly this has a wall 15 and is filled with hydraulic oil under pressure, which may e.g. be 1300 bars in deep boreholes. A compensator (not shown), which is of a known type and will therefore not be mentioned more fully here, is provided in the power sec¬ tion to equalize the pressure with respect to the sur¬ roundings. The power section comprises a hydraulic pump 16 inserted with hydraulic pipes 17 into the hydraulic cir¬ cuit of the traction section 11 to the wheels 13. The hydraulic pump 16 is driven via a shaft 18 by an electric motor 19. A battery 20 serves to energize the motor 19. The power section is connected with the measuring tools and measuring station on the surface via a wire 21 having the necessary electric cables 22, which are run into a cable distributor 23 and from this via other electric cables 24 to optional measuring tools arranged in front of the tractor. The battery is connected by electric cables 25, 26 and 27, respectively, to the electric motor 19 via an electric converter 28 and a control relay 29, which is in turn connected with the measuring station 10 on the surface via a control line 30, the cable distributor 23 and the electric cables 22.
As mentioned, the power section 12 is filled with hydrau¬ lic oil under a very high pressure, which may be up to 1300 bars, and it will therefore not be expedient to use a fully encapsulated electric motor whose shaft lead-in will have difficulty in maintaining a tight seal against the huge pressure difference. The electric motor 19 is there¬ fore of an open design and interiorly completely filled with hydraulic oil. A DC motor is not suitable for working with the commutator thus immersed in oil, and instead an AC motor is used without a commutator. The DC current from the battery 20 is therefore converted to AC current in the converter 28 before being fed to the electric motor 19.
The battery 20, the converter 28 and the control relay 29 are moreover encapsulated in an air-filled pressure con¬ tainer 31, since these electric components cannot stand being exposed in the hydraulic oil because of i.a. the high pressure in it.
Just a start and stop signal is required for controlling the tractor, applied to the control relay 29 from the measuring station on the surface via the wireline 21 and the control line 30. Another way of controlling the trac¬ tor is to incorporate a timer (not shown) in it for start¬ ing the tractor after e.g. half an hour and stopping it again when a touch sensor (not shown) engages the end of the hole. A tractor for an 8 1/2" borehole may typically have the following specifications:
Max outside diameter 149 mm Nominal diameter 140 mm
Length 3-4 m
Weight max 200 kg
Weight incl. buoyancy max 100 kg
Power requirement max 5.0 kW Power requirement average 1.2 kW
Battery amount minimum 5 kWh
Speed constant 1000 m/h
Force forward max 15 kN
Wash outs 280 mm Hydrostatic pressure max 1300 bars
Temperature max 150°C
Tensile strength 30 kN
The above-mentioned tractor will be capable of pulling 20 to 30 meters of measuring tools as well as a minimum of
3000 of wireline having a total weigth of about 1500 kg in a horizontal borehole.
To ensure undisturbed operation of the wireline drum on the surface it will expedient that the tractor drives for- wardly in the borehole at a constant speed, irrespective of the load, so that the wireline correspondingly runs in the hole at a constant rate over the distance in which the tractor is active. Normal down rate of the standard measuring tools is about 3000 m/h, and a normal retraction rate with the wireline is about 600 m/h. The speed of the tractor is expediently fixed at 1000 m/h to limit the power requirement.
In the previously mentioned borehole having an overall depth of 5000 meters, of which half had an inclination of above 60°, the time it took the drill string to advance the measuring tools was about 24 hours. Instead, using the tractor of the invention with the above-mentioned specifi¬ cations this time can typically be reduced to 8 hours, thus providing a time saving of about 16 hours.

Claims

P a t e n t C l a i m s:
1. A hydraulically driven tractor for advancing process- ing and/or measuring equipment in a pre-drilled hole in a subterranean formation, comprising a section filled with hydraulic oil and containing a hydraulic pump for the hydraulic system of the tractor, an electric motor for operating said pump and a battery for energizing the motor, c h a r a c t e r i z e d in that the motor is an open AC motor, that a converter for converting the current to AC current is inserted between the motor and the battery, and that the battery and the converter are incorporated in an air-filled pressure container.
2. A tractor according to claim 1, c h a r a c t e r ¬ i z e d in that the pressure container moreover incor¬ porates a control relay.
PCT/DK1993/000092 1992-03-13 1993-03-12 A tractor for advancing processing and measuring equipment in a borehole WO1993018277A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38883/93A AU3888393A (en) 1992-03-13 1993-03-12 A tractor for advancing processing and measuring equipment in a borehole

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK92341A DK34192D0 (en) 1992-03-13 1992-03-13 TRACTOR FOR PROMOTING PROCESSING AND MEASURING EQUIPMENT IN A Borehole
DK0341/92 1992-03-13

Publications (1)

Publication Number Publication Date
WO1993018277A1 true WO1993018277A1 (en) 1993-09-16

Family

ID=8092433

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1993/000092 WO1993018277A1 (en) 1992-03-13 1993-03-12 A tractor for advancing processing and measuring equipment in a borehole

Country Status (2)

Country Link
DK (1) DK34192D0 (en)
WO (1) WO1993018277A1 (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2330162A (en) * 1997-10-13 1999-04-14 Inst Francais Du Petrole Apparatus for displacing logging equipment within an inclined borehole
FR2769664A1 (en) 1997-10-13 1999-04-16 Inst Francais Du Petrole MEASUREMENT METHOD AND SYSTEM HAVING SEMI-RIGID EXTENSION
WO1999066172A1 (en) 1998-06-12 1999-12-23 Shell Internationale Research Maatschappij B.V. Method and system for measuring data in a fluid transportation conduit
WO1999066171A2 (en) * 1998-06-12 1999-12-23 Shell Internationale Research Maatschappij B.V. Method and system for moving equipment into and through an oil and/or gas production well
WO2000046481A2 (en) * 1999-02-05 2000-08-10 Pes Inc. Downhole tractor
WO2002091535A2 (en) * 2001-05-09 2002-11-14 Tracto-Technik Gmbh Device and method for drawing cables in pipes
WO2003034522A1 (en) * 2001-10-12 2003-04-24 Expo North Sea Limited Operating electrolyte based components
US6758279B2 (en) 1995-08-22 2004-07-06 Western Well Tool, Inc. Puller-thruster downhole tool
GB2401130A (en) * 2003-04-30 2004-11-03 Weatherford Lamb A traction apparatus
US6953086B2 (en) 2000-11-24 2005-10-11 Weatherford/Lamb, Inc. Bi-directional traction apparatus
GB2418946B (en) * 2003-07-16 2007-11-07 Schlumberger Holdings Open hole tractor with tracks
US7348892B2 (en) * 2004-01-20 2008-03-25 Halliburton Energy Services, Inc. Pipe mounted telemetry receiver
EP2282002A3 (en) * 2000-02-15 2011-05-04 Exxonmobil Upstream Research Company Corp-URC-SW-3 Method and apparatus for stimulation of multiple formation intervals
EP2458137A1 (en) * 2010-11-24 2012-05-30 Welltec A/S Wireless downhole unit
EP2458138A1 (en) * 2010-11-24 2012-05-30 Welltec A/S Downhole system having a wireless unit
EP2505772A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Hydraulic assembly
EP2505770A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Torque member
EP2505767A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Fail-safe spring
EP2505771A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Arm assembly
EP2505768A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Modular downhole tool
EP2505769A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Service panel
DK177312B1 (en) * 2009-11-24 2012-11-19 Maersk Olie & Gas Apparatus and system and method for measuring data in a well propagating below the surface
US8944161B2 (en) 2000-05-18 2015-02-03 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US20150167416A1 (en) * 2012-06-14 2015-06-18 Halliburton Energy Services, Inc. Well Tractor
US9447648B2 (en) 2011-10-28 2016-09-20 Wwt North America Holdings, Inc High expansion or dual link gripper
US9488020B2 (en) 2014-01-27 2016-11-08 Wwt North America Holdings, Inc. Eccentric linkage gripper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433986A (en) * 1966-06-13 1969-03-18 Reda Pump Co Oil filled elongated submergible electric motor
DK137935B (en) * 1972-07-18 1978-06-05 Mobil Oil Corp Method and system for controlling from the ground surface of measurement operations in a borehole.
US4499955A (en) * 1983-08-12 1985-02-19 Chevron Research Company Battery powered means and method for facilitating measurements while coring
US4763259A (en) * 1985-03-29 1988-08-09 Panex Corporation Memory processing systems for well tools
US4833354A (en) * 1988-06-13 1989-05-23 Trw Inc. Oil-filled submergible electric pump motor with unvarnished stator structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433986A (en) * 1966-06-13 1969-03-18 Reda Pump Co Oil filled elongated submergible electric motor
DK137935B (en) * 1972-07-18 1978-06-05 Mobil Oil Corp Method and system for controlling from the ground surface of measurement operations in a borehole.
US4499955A (en) * 1983-08-12 1985-02-19 Chevron Research Company Battery powered means and method for facilitating measurements while coring
US4763259A (en) * 1985-03-29 1988-08-09 Panex Corporation Memory processing systems for well tools
US4833354A (en) * 1988-06-13 1989-05-23 Trw Inc. Oil-filled submergible electric pump motor with unvarnished stator structure

Cited By (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7059417B2 (en) 1995-08-22 2006-06-13 Western Well Tool, Inc. Puller-thruster downhole tool
US7273109B2 (en) 1995-08-22 2007-09-25 Western Well Tool Puller-thruster downhole tool
US6758279B2 (en) 1995-08-22 2004-07-06 Western Well Tool, Inc. Puller-thruster downhole tool
US7156181B2 (en) * 1995-08-22 2007-01-02 Western Well Tool, Inc. Puller-thruster downhole tool
GB2330162B (en) * 1997-10-13 2002-03-13 Inst Francais Du Petrole Logging method and system in a horizontal passage
US6173787B1 (en) 1997-10-13 2001-01-16 Institut Francais Du Petrole Method and system intended for measurements in a horizontal pipe
US6179058B1 (en) 1997-10-13 2001-01-30 Institut Francis Du Petrole Measuring method and system comprising a semi-rigid extension
FR2769665A1 (en) 1997-10-13 1999-04-16 Inst Francais Du Petrole MEASUREMENT METHOD AND SYSTEM IN A HORIZONTAL DUCT
GB2330162A (en) * 1997-10-13 1999-04-14 Inst Francais Du Petrole Apparatus for displacing logging equipment within an inclined borehole
FR2769664A1 (en) 1997-10-13 1999-04-16 Inst Francais Du Petrole MEASUREMENT METHOD AND SYSTEM HAVING SEMI-RIGID EXTENSION
WO1999066171A2 (en) * 1998-06-12 1999-12-23 Shell Internationale Research Maatschappij B.V. Method and system for moving equipment into and through an oil and/or gas production well
WO1999066172A1 (en) 1998-06-12 1999-12-23 Shell Internationale Research Maatschappij B.V. Method and system for measuring data in a fluid transportation conduit
US6241028B1 (en) 1998-06-12 2001-06-05 Shell Oil Company Method and system for measuring data in a fluid transportation conduit
WO1999066171A3 (en) * 1998-06-12 2001-11-08 Shell Int Research Method and system for moving equipment into and through an oil and/or gas production well
US6675888B2 (en) 1998-06-12 2004-01-13 Shell Oil Company Method and system for moving equipment into and through an underground well
US6454011B1 (en) 1998-06-12 2002-09-24 Shell Oil Company Method and system for moving equipment into and through a conduit
EA003317B1 (en) * 1998-06-12 2003-04-24 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Method and system for moving equipment into and through a conduit
WO2000046481A2 (en) * 1999-02-05 2000-08-10 Pes Inc. Downhole tractor
US6273189B1 (en) 1999-02-05 2001-08-14 Halliburton Energy Services, Inc. Downhole tractor
WO2000046481A3 (en) * 1999-02-05 2001-02-15 Petroleum Eng Services Downhole tractor
EP2282002A3 (en) * 2000-02-15 2011-05-04 Exxonmobil Upstream Research Company Corp-URC-SW-3 Method and apparatus for stimulation of multiple formation intervals
US9988868B2 (en) 2000-05-18 2018-06-05 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US8944161B2 (en) 2000-05-18 2015-02-03 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US9228403B1 (en) 2000-05-18 2016-01-05 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US6953086B2 (en) 2000-11-24 2005-10-11 Weatherford/Lamb, Inc. Bi-directional traction apparatus
WO2002091535A2 (en) * 2001-05-09 2002-11-14 Tracto-Technik Gmbh Device and method for drawing cables in pipes
WO2002091535A3 (en) * 2001-05-09 2007-10-25 Tracto Technik Device and method for drawing cables in pipes
WO2003034522A1 (en) * 2001-10-12 2003-04-24 Expo North Sea Limited Operating electrolyte based components
US7427452B2 (en) 2001-10-12 2008-09-23 Expro North Seal Limited Operating electrolyte based components
GB2401130B (en) * 2003-04-30 2006-11-01 Weatherford Lamb A traction apparatus
GB2401130A (en) * 2003-04-30 2004-11-03 Weatherford Lamb A traction apparatus
US7051587B2 (en) 2003-04-30 2006-05-30 Weatherford/Lamb, Inc. Traction apparatus
GB2418946B (en) * 2003-07-16 2007-11-07 Schlumberger Holdings Open hole tractor with tracks
US7348892B2 (en) * 2004-01-20 2008-03-25 Halliburton Energy Services, Inc. Pipe mounted telemetry receiver
US9476274B2 (en) 2009-11-24 2016-10-25 Maersk Olie Og Gas A/S Apparatus and system and method of measuring data in a well extending below surface
DK177312B1 (en) * 2009-11-24 2012-11-19 Maersk Olie & Gas Apparatus and system and method for measuring data in a well propagating below the surface
WO2012069541A1 (en) * 2010-11-24 2012-05-31 Welltec A/S Downhole system having a wireless unit
WO2012069540A1 (en) * 2010-11-24 2012-05-31 Welltec A/S Wireless downhole unit
US9957789B2 (en) 2010-11-24 2018-05-01 Welltec A/S Downhole system having a wireless unit
EP2458138A1 (en) * 2010-11-24 2012-05-30 Welltec A/S Downhole system having a wireless unit
US9328577B2 (en) 2010-11-24 2016-05-03 Welltec A/S Wireless downhole unit
EP2458137A1 (en) * 2010-11-24 2012-05-30 Welltec A/S Wireless downhole unit
CN103228861A (en) * 2010-11-24 2013-07-31 韦尔泰克有限公司 Downhole system having a wireless unit
EP2505770A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Torque member
RU2585775C2 (en) * 2011-03-30 2016-06-10 Веллтек А/С Torque-based element
WO2012130940A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Service panel
WO2012130944A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Hydraulic assembly
WO2012130945A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Arm assembly
WO2012130939A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Modular downhole tool
CN103459763A (en) * 2011-03-30 2013-12-18 韦尔泰克有限公司 Modular downhole tool
CN103459762A (en) * 2011-03-30 2013-12-18 韦尔泰克有限公司 Hydraulic assembly
CN103477022A (en) * 2011-03-30 2013-12-25 韦尔泰克有限公司 Arm assembly
WO2012130943A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Torque member
AU2012234262B2 (en) * 2011-03-30 2015-03-05 Welltec A/S Hydraulic assembly
EP2505772A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Hydraulic assembly
US9097087B2 (en) 2011-03-30 2015-08-04 Welltec A/S Fail-safe spring
EP2505769A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Service panel
EP2505768A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Modular downhole tool
WO2012130942A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Fail-safe spring
EP2505767A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Fail-safe spring
US9708873B2 (en) 2011-03-30 2017-07-18 Welltec A/S Hydraulic assembly
EP2505771A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Arm assembly
US9523253B2 (en) 2011-03-30 2016-12-20 Welltec A/S Torque member
US9494001B2 (en) 2011-03-30 2016-11-15 Welltec A/S Service panel
US9512688B2 (en) 2011-03-30 2016-12-06 Welltec A/S Arm assembly
US9518437B2 (en) 2011-03-30 2016-12-13 Welltec A/S Modular downhole tool
RU2605106C2 (en) * 2011-03-30 2016-12-20 Веллтек А/С Hydraulic assembly
US9447648B2 (en) 2011-10-28 2016-09-20 Wwt North America Holdings, Inc High expansion or dual link gripper
EP2847416A4 (en) * 2012-06-14 2016-09-21 Halliburton Energy Services Inc Well tractor
US9777545B2 (en) * 2012-06-14 2017-10-03 Halliburton Energy Services, Inc. Well tractor
US20150167416A1 (en) * 2012-06-14 2015-06-18 Halliburton Energy Services, Inc. Well Tractor
US9488020B2 (en) 2014-01-27 2016-11-08 Wwt North America Holdings, Inc. Eccentric linkage gripper
US10156107B2 (en) 2014-01-27 2018-12-18 Wwt North America Holdings, Inc. Eccentric linkage gripper
US10934793B2 (en) 2014-01-27 2021-03-02 Wwt North America Holdings, Inc. Eccentric linkage gripper
US11608699B2 (en) 2014-01-27 2023-03-21 Wwt North America Holdings, Inc. Eccentric linkage gripper

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