WO2001084040A1 - A sleeve plug device - Google Patents

A sleeve plug device Download PDF

Info

Publication number
WO2001084040A1
WO2001084040A1 PCT/NO2001/000176 NO0100176W WO0184040A1 WO 2001084040 A1 WO2001084040 A1 WO 2001084040A1 NO 0100176 W NO0100176 W NO 0100176W WO 0184040 A1 WO0184040 A1 WO 0184040A1
Authority
WO
WIPO (PCT)
Prior art keywords
plug
sleeve
pipe
diameter
core
Prior art date
Application number
PCT/NO2001/000176
Other languages
French (fr)
Inventor
Geir Nordahl-Pedersen
Original Assignee
Agr Services As
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 Agr Services As filed Critical Agr Services As
Priority to AU56873/01A priority Critical patent/AU5687301A/en
Publication of WO2001084040A1 publication Critical patent/WO2001084040A1/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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
    • E21B23/10—Tools specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F16L55/28—Constructional aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F16L55/28—Constructional aspects
    • F16L55/30—Constructional aspects of the propulsion means, e.g. towed by cables
    • F16L55/38—Constructional aspects of the propulsion means, e.g. towed by cables driven by fluid pressure

Definitions

  • This invention relates to a device for the use of a plug in a pipe, typically a pipe connected to petroleum activity, and where the pipe has a reduction in diameter.
  • a drive plug may have several methods of propulsion, e.g. differential pressure between the ends of the plug, or driven wheels/belts bearing on the pipe wall.
  • differential pressure between the ends of the plug
  • driven wheels/belts bearing on the pipe wall.
  • the drive plug is equipped with propulsion devices, such as wheels or belts, the complexity of the drive plug increases considerably.
  • Drive plugs based on propulsion by means of differential pressure normally have the greatest pull-thrust-force, and are therefore often used when relatively great loads are to be transported.
  • the use of this type of drive plugs is limited in that, as opposed to plugs with wheel or belt propulsion, they cannot drive from a pipe of one diameter into a pipe of a substantially smaller diameter.
  • the object of the invention is to provide a solution which remedies the drawbacks of the above-mentioned equipment, and which enables the use of drive plugs propelled by differential pressure also in pipes which have a considerable reduction in diameter.
  • a two-part plug in which a core plug is positioned within a sleeve plug, is inserted into the pipe of the larger diameter.
  • the outer diameter of the sleeve plug is adapted to the inner diameter of the larger pipe, whereas its inner diameter corresponds to the inner diameter of the smaller pipe.
  • the sleeve plug has a conventional seal against the internal face of the larger pipe.
  • the diameter and the seal of the core plug is adapted to the inner diameter of the smaller pipe. Therefore it also fits into and seals against the inner surface of the sleeve plug.
  • the sleeve plug is provided with a device which securely locks the core plug when it is positioned inside the sleeve plug.
  • Both the sleeve plug and the core plug may be provided with attachment elements for tools and instruments. In operation the plug is normally connected to the surface through a line.
  • the core plug When the equipment is used, the core plug is placed within the sleeve plug and locked by the locking device. The two parts are inserted into and transported as a unit through the larger diameter pipe.
  • the sealing of the sleeve plug against the pipe, and the sealing of the core plug against the inner face of the sleeve plug together form a seal towards the fluid in the pipe, and the pressure difference in front and to the rear of the plug results in a force which pushes the assembled plug in the desired direction.
  • the sleeve plug stops because its outer diameter is too large to get any further.
  • the locking device between the plug parts is released, e.g. in that an element of the lock projects from the front end portion of the sleeve plug and thereby meets the transition from the large pipe immediately before the sleeve plug reaches its end position.
  • the differential pressure still acting on the equipment then pushes the core plug out of the sleeve plug and into the pipe with the smaller diameter, so that the core plug can continue to the desired position.
  • the pressure in the pipes can be adjusted so that the differential force acts in the opp site direction, or the plug can be withdrawn by a pull on the connection line.
  • the core plug returns to the sleeve plug, it enters the hole of the sleeve plug and stops against a flange in the inner pipe of the sleeve plug.
  • the plugs return to the surface as a unit. If the returning of the core plug into the pipe plug should be unsuccessful, the plugs can be pulled up together by means of the line.
  • a development of the invention may be to assemble several sleeve plugs of different diameters, so that the core plug can reach and be carried further in pipes where there are several reductions in diameter. It can also be used with remote-controlled plugs, i.e. plugs that have no connecting cable to the surface.
  • Fig. 1 is a sectional view of the plug unit with the core plug locked in position within the sleeve plug, immediately before it reaches the end of a pipe of a smaller diameter;
  • Fig. 2 is a sectional view of the sleeve plug in position at the end of the large pipe, and with the locking mechanism released and the core plug carried partiall out of the sleeve plug and into the smaller diameter pipe;
  • Fig. 3 is a sectional view of the core plug on its way back into a position immediately before entering the sleeve plug;
  • Fig. 4 shows in perspective a principle drawing of. the locking device in its locked position
  • Fig. 5 shows in perspective a principle drawing of the locking device in its unlocked position.
  • Fig. 1 the reference numeral 1 identifies a pipe of large diameter.
  • a transition 3 connects the large pipe 2 with a pipe 2 of a considerably smaller diameter.
  • a sleeve plug 4 is provided with a seal 6 and guides 7, all adapted to the inner diameter of the pipe 1 of the larger diameter.
  • a sleeve 5 At the centre of the sleeve plug 4 is arranged a sleeve 5 with an inner diameter adapted/corresponding to the internal diameter of the smaller pipe 2.
  • a locking device 8 comprising a wedge 9 and a catch 10.
  • a circular flange 11 In the opposite internal end portion of the sleeve 5 is arranged a circular flange 11.
  • Fig. 1 shows a core plug 12 positioned within the sleeve 5.
  • the core plug 12 which has a tight end gable, is provided with guides 13 and 13', seals 14 and an attachment element 15 to which a line 16 is connected.
  • the core plug 12 is prevented from being forced out of the sleeve 5 in that it abuts, in the direction towards the smaller diameter pipe, the catch 10, and in the opposite direction, the flange 11.
  • the internal diameter of the sleeve 5 is approximately equal to the internal diameter of the smaller pipe 2.
  • the guides 13 and seals 14 of the core plug 12, are arranged to fit within the pipe cross-sections of both the sleeve 5 and the smaller pipe 2.
  • the locking unit 8 releases the core plug 12.
  • This can be accomplished, for example', in that a wedge 9, which is arranged to withdraw, on axial displacement, the catch 10 from a recess in the sleeve 5, comes to bear against the transition 3 immediately before the sleeve plug 4 stops against the transition 3.
  • the wedge 9 will then be displaced relatively towards the sleeve 5, which is sufficient to pull out the catch 10. See Fig. 2.
  • the seal 6 of the sleeve plug 4 still seals against the inner wall of the big pipe 1 so that it is held in position against the transition 3.
  • the pipe pressures can be adjusted so that the differential force acts in the opposite direction, or the plug can be withdrawn by a pull on a line 16 which is attached to the core plug in an attachment element 15.
  • the core plug 12 returns to the pipe plug 4, it enters the sleeve 5 of the sleeve plug 12 and stops against the flange 11 in the end portion of the sleeve 5.
  • the plugs return as a unit to the surface. Should the returning of the core plug 12 into the pipe plug 4 fail, the plugs 4, 12 may be withdrawn by means of the line 16.
  • the invention enables the use of a plug driven by differential pressure also in pipes where there is a great reduction in diameter, with the possibilities this involves for performing heavy work operations in such conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Pipe Accessories (AREA)

Abstract

A drive plug device for driving a tool or other equipment within a pipe with at least one transition (3) from a larger pipe diameter (1) to a smaller pipe diameter (2), said drive plug being at least two-part, comprising at least a sleeve plug (4) with an outer diameter adapted to the larger pipe (1) and an internal diameter adapted to the smaller pipe (2), so that a core plug (12) can be placed in a sleeve (5) in the sleeve plug (4) and is arranged to be pushed from the sleeve (5) into the smaller pipe (2) when the sleeve plug (4) abuts the transition (3).

Description

A SLEEVE PLUG DEVICE
This invention relates to a device for the use of a plug in a pipe, typically a pipe connected to petroleum activity, and where the pipe has a reduction in diameter.
By measuring, inspection and other operations inside a pipe of the kind in question, tools and instruments are inserted into the pipe by means of a drive plug. A drive plug may have several methods of propulsion, e.g. differential pressure between the ends of the plug, or driven wheels/belts bearing on the pipe wall. When the drive plug with an associated seal against the pipe wall is placed in a pipe, and a higher pressure is applied in the pipe on one side of the plug than on the other side of the plug, a force will arise in the direction of the side with the lower pressure, equalling the pressure difference between the sides multiplied by the cross-section of the pipe. By varying these pressures, very large forces can act on the drive plug.
r
Drive plugs meant to be propelled by means of differential pressure are basically of a simple construction with few parts .
If the drive plug is equipped with propulsion devices, such as wheels or belts, the complexity of the drive plug increases considerably.
Drive plugs based on propulsion by means of differential pressure, normally have the greatest pull-thrust-force, and are therefore often used when relatively great loads are to be transported. The use of this type of drive plugs is limited in that, as opposed to plugs with wheel or belt propulsion, they cannot drive from a pipe of one diameter into a pipe of a substantially smaller diameter.
The object of the invention is to provide a solution which remedies the drawbacks of the above-mentioned equipment, and which enables the use of drive plugs propelled by differential pressure also in pipes which have a considerable reduction in diameter.
The object is realized in accordance with the invention through the features specified in the description below and in the following Claims.
A two-part plug, in which a core plug is positioned within a sleeve plug, is inserted into the pipe of the larger diameter. The outer diameter of the sleeve plug is adapted to the inner diameter of the larger pipe, whereas its inner diameter corresponds to the inner diameter of the smaller pipe. The sleeve plug has a conventional seal against the internal face of the larger pipe. The diameter and the seal of the core plug is adapted to the inner diameter of the smaller pipe. Therefore it also fits into and seals against the inner surface of the sleeve plug. The sleeve plug is provided with a device which securely locks the core plug when it is positioned inside the sleeve plug. Both the sleeve plug and the core plug may be provided with attachment elements for tools and instruments. In operation the plug is normally connected to the surface through a line.
When the equipment is used, the core plug is placed within the sleeve plug and locked by the locking device. The two parts are inserted into and transported as a unit through the larger diameter pipe. The sealing of the sleeve plug against the pipe, and the sealing of the core plug against the inner face of the sleeve plug together form a seal towards the fluid in the pipe, and the pressure difference in front and to the rear of the plug results in a force which pushes the assembled plug in the desired direction.
When the unit arrives at the transition to a smaller pipe diameter, the sleeve plug stops because its outer diameter is too large to get any further. The locking device between the plug parts is released, e.g. in that an element of the lock projects from the front end portion of the sleeve plug and thereby meets the transition from the large pipe immediately before the sleeve plug reaches its end position. The differential pressure still acting on the equipment then pushes the core plug out of the sleeve plug and into the pipe with the smaller diameter, so that the core plug can continue to the desired position.
When the core plug is being returned, the pressure in the pipes can be adjusted so that the differential force acts in the opp site direction, or the plug can be withdrawn by a pull on the connection line. As the core plug returns to the sleeve plug, it enters the hole of the sleeve plug and stops against a flange in the inner pipe of the sleeve plug. The plugs return to the surface as a unit. If the returning of the core plug into the pipe plug should be unsuccessful, the plugs can be pulled up together by means of the line.
A development of the invention may be to assemble several sleeve plugs of different diameters, so that the core plug can reach and be carried further in pipes where there are several reductions in diameter. It can also be used with remote-controlled plugs, i.e. plugs that have no connecting cable to the surface.
In the following a non-limiting example of a preferred embodiment is described, and it is visualized in the accompanying drawings, in which:
Fig. 1 is a sectional view of the plug unit with the core plug locked in position within the sleeve plug, immediately before it reaches the end of a pipe of a smaller diameter;
Fig. 2 is a sectional view of the sleeve plug in position at the end of the large pipe, and with the locking mechanism released and the core plug carried partiall out of the sleeve plug and into the smaller diameter pipe;
Fig. 3 is a sectional view of the core plug on its way back into a position immediately before entering the sleeve plug;
Fig. 4 shows in perspective a principle drawing of. the locking device in its locked position; Fig. 5 shows in perspective a principle drawing of the locking device in its unlocked position.
In Fig. 1 the reference numeral 1 identifies a pipe of large diameter. A transition 3 connects the large pipe 2 with a pipe 2 of a considerably smaller diameter. A sleeve plug 4 is provided with a seal 6 and guides 7, all adapted to the inner diameter of the pipe 1 of the larger diameter. At the centre of the sleeve plug 4 is arranged a sleeve 5 with an inner diameter adapted/corresponding to the internal diameter of the smaller pipe 2. At the external end portion of the sleeve 5, in the direction towards the smaller pipe 2, there is arranged a locking device 8 comprising a wedge 9 and a catch 10. In the opposite internal end portion of the sleeve 5 is arranged a circular flange 11.
Fig. 1 shows a core plug 12 positioned within the sleeve 5. The core plug 12, which has a tight end gable, is provided with guides 13 and 13', seals 14 and an attachment element 15 to which a line 16 is connected. The core plug 12 is prevented from being forced out of the sleeve 5 in that it abuts, in the direction towards the smaller diameter pipe, the catch 10, and in the opposite direction, the flange 11. The internal diameter of the sleeve 5 is approximately equal to the internal diameter of the smaller pipe 2. The guides 13 and seals 14 of the core plug 12, are arranged to fit within the pipe cross-sections of both the sleeve 5 and the smaller pipe 2.
As the plug unit reaches the transition 3, the locking unit 8 releases the core plug 12. This can be accomplished, for example', in that a wedge 9, which is arranged to withdraw, on axial displacement, the catch 10 from a recess in the sleeve 5, comes to bear against the transition 3 immediately before the sleeve plug 4 stops against the transition 3. The wedge 9 will then be displaced relatively towards the sleeve 5, which is sufficient to pull out the catch 10. See Fig. 2. The seal 6 of the sleeve plug 4 still seals against the inner wall of the big pipe 1 so that it is held in position against the transition 3. The differential pressure in the pipe then pushes the core plug 12 out of the sleeve 5 and into the smaller pipe 2, whereby the sleeve plug 4 is opened to flow of the pressure medium in the pipe 1, 2. The friction between the seal 6 and the wall of the large pipe 1, and often also the gravitational force retains the sleeve plug 4 in its position against the transition 3.
As the core plug 12 is being returned, the pipe pressures can be adjusted so that the differential force acts in the opposite direction, or the plug can be withdrawn by a pull on a line 16 which is attached to the core plug in an attachment element 15. As the core plug 12 returns to the pipe plug 4, it enters the sleeve 5 of the sleeve plug 12 and stops against the flange 11 in the end portion of the sleeve 5. The plugs return as a unit to the surface. Should the returning of the core plug 12 into the pipe plug 4 fail, the plugs 4, 12 may be withdrawn by means of the line 16.
Thus, the invention enables the use of a plug driven by differential pressure also in pipes where there is a great reduction in diameter, with the possibilities this involves for performing heavy work operations in such conditions.

Claims

C L A I M S
1. A drive plug device for the transport of tools and other equipment internally in a pipe with at least one ' transition (3) from a larger pipe diameter (1) to a smaller pipe diameter (2), c h ar acter i z ed i n that the drive-plug is at least two-part, comprising at least one sleeve plug (4) with an outer diameter which is adapted to the larger pipe ( 1 ) , and an internal diameter which is adapted to the smaller pipe (2), so that a core plug (12) can be placed in a sleeve (5) in the sleeve plug (4), and is arranged to be pushed from the sleeve (5) into the smaller pipe (2) as the sleeve plug (4) comes to bear on the transition (3).
2. A device according to claim 1, charac t er i z ed in that the sleeve plug (4) and the core plug (12) are provided with seals (6, 14).
3. A device according to claim(s) 1 and/or 2, characteri z ed i n that the downstream end portion of the sleeve (5) is provided with a locking device (8) arranged to prevent the core sleeve (12) from being pushed out of the sleeve (5) during forward transport to the transition (3).
4. A device according to one or more of the preceding claims, characteri z e d in that in the upstream gable portion of the sleeve (5) there is arranged a flange (11) with the purpose of preventing the core plug (12) from passing through the sleeve plug (4) as it returns thereto.
PCT/NO2001/000176 2000-05-03 2001-04-27 A sleeve plug device WO2001084040A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU56873/01A AU5687301A (en) 2000-05-03 2001-04-27 A sleeve plug device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20002336A NO20002336L (en) 2000-05-03 2000-05-03 Device for inserting a plug into a tube where there is a diameter reduction
NO20002336 2000-05-03

Publications (1)

Publication Number Publication Date
WO2001084040A1 true WO2001084040A1 (en) 2001-11-08

Family

ID=19911095

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2001/000176 WO2001084040A1 (en) 2000-05-03 2001-04-27 A sleeve plug device

Country Status (3)

Country Link
AU (1) AU5687301A (en)
NO (1) NO20002336L (en)
WO (1) WO2001084040A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002079605A1 (en) * 2001-03-29 2002-10-10 Tesco Corporation Downhole axial force generating tool
WO2014109838A1 (en) * 2013-01-10 2014-07-17 Chevron U.S.A. Inc. Pig assembly and method for maintaining a functional line for conveying fluid
WO2014109839A3 (en) * 2013-01-10 2015-08-13 Chevron U.S.A. Inc. Methods, apparatus and systems for conveying fluids
CN105156051A (en) * 2014-06-09 2015-12-16 中国石油化工股份有限公司 Releasing device
US9222320B2 (en) 2010-12-29 2015-12-29 Halliburton Energy Services, Inc. Subsea pressure control system
CN105736897A (en) * 2016-03-16 2016-07-06 华中科技大学 Driving device for internal inspection of magnetic flux leakage of industrial pipeline and using method of driving device
US9662690B2 (en) 2014-07-15 2017-05-30 Chevron U.S.A. Inc. Systems for maintaining a functional line for conveying fluid and pig assemblies for use therein
EP3186471A4 (en) * 2014-08-27 2018-04-18 Scientific Drilling International, Inc. Method and apparatus for through-tubular sensor deployment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382578A (en) * 1943-06-08 1945-08-14 Arthur J Penick Producing equipment for wells
US3020964A (en) * 1959-11-09 1962-02-13 Jersey Prod Res Co Device for introducing fluid in wells
US4407364A (en) * 1981-01-27 1983-10-04 Otis Engineering Corporation Landing nipple for pumpdown well completion system
US4844165A (en) * 1987-02-05 1989-07-04 Shell Oil Company TFL assembly for a dual diameter flow-line/riser system and flow-line/riser system for use with the assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382578A (en) * 1943-06-08 1945-08-14 Arthur J Penick Producing equipment for wells
US3020964A (en) * 1959-11-09 1962-02-13 Jersey Prod Res Co Device for introducing fluid in wells
US4407364A (en) * 1981-01-27 1983-10-04 Otis Engineering Corporation Landing nipple for pumpdown well completion system
US4844165A (en) * 1987-02-05 1989-07-04 Shell Oil Company TFL assembly for a dual diameter flow-line/riser system and flow-line/riser system for use with the assembly

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7021382B2 (en) 2001-03-29 2006-04-04 Tesco Corporation Downhole axial force generating tool
WO2002079605A1 (en) * 2001-03-29 2002-10-10 Tesco Corporation Downhole axial force generating tool
US9222320B2 (en) 2010-12-29 2015-12-29 Halliburton Energy Services, Inc. Subsea pressure control system
GB2543689B (en) * 2013-01-10 2017-07-12 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
GB2524210B (en) * 2013-01-10 2017-05-03 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
GB2525343A (en) * 2013-01-10 2015-10-21 Chevron Usa Inc Methods, apparatus and systems for conveying fluids
GB2525343B (en) * 2013-01-10 2020-05-27 Chevron Usa Inc Methods, apparatus and systems for conveying fluids
WO2014109839A3 (en) * 2013-01-10 2015-08-13 Chevron U.S.A. Inc. Methods, apparatus and systems for conveying fluids
WO2014109838A1 (en) * 2013-01-10 2014-07-17 Chevron U.S.A. Inc. Pig assembly and method for maintaining a functional line for conveying fluid
GB2543689A (en) * 2013-01-10 2017-04-26 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
GB2524210A (en) * 2013-01-10 2015-09-16 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
CN105156051B (en) * 2014-06-09 2019-04-05 中国石油化工股份有限公司 Releasing device
CN105156051A (en) * 2014-06-09 2015-12-16 中国石油化工股份有限公司 Releasing device
US9662690B2 (en) 2014-07-15 2017-05-30 Chevron U.S.A. Inc. Systems for maintaining a functional line for conveying fluid and pig assemblies for use therein
EP3186471A4 (en) * 2014-08-27 2018-04-18 Scientific Drilling International, Inc. Method and apparatus for through-tubular sensor deployment
US10316599B2 (en) 2014-08-27 2019-06-11 Scientific Drilling International, Inc. Method and apparatus for through-tubular sensor deployment
CN105736897A (en) * 2016-03-16 2016-07-06 华中科技大学 Driving device for internal inspection of magnetic flux leakage of industrial pipeline and using method of driving device
CN105736897B (en) * 2016-03-16 2017-10-31 华中科技大学 Detection drive device and its application method in industrial pipeline leakage field

Also Published As

Publication number Publication date
NO20002336L (en) 2001-11-05
AU5687301A (en) 2001-11-12
NO20002336D0 (en) 2000-05-03

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