KR101873452B1 - Winding Apparatus for Continuous Boring - Google Patents

Winding Apparatus for Continuous Boring Download PDF

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Publication number
KR101873452B1
KR101873452B1 KR1020170034699A KR20170034699A KR101873452B1 KR 101873452 B1 KR101873452 B1 KR 101873452B1 KR 1020170034699 A KR1020170034699 A KR 1020170034699A KR 20170034699 A KR20170034699 A KR 20170034699A KR 101873452 B1 KR101873452 B1 KR 101873452B1
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South Korea
Prior art keywords
module
wire
hoisting
lifting
lifting module
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KR1020170034699A
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Korean (ko)
Inventor
고두열
강부원
양재민
유영준
하영열
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삼성중공업 주식회사
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Priority to KR1020170034699A priority Critical patent/KR101873452B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • 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
    • E21B3/00—Rotary drilling
    • E21B3/02—Surface drives for rotary drilling

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

Abstract

The present invention relates to a winding apparatus for continuous boring that can improve productivity by performing the whole drilling process. The winding apparatus includes a first drilling assembly having a first hoisting module for hoisting a pipe, and a roughneck, provided on one side of the first hoisting module to be moved in a vertical direction in a state of being away from the first hoisting module, to fasten adjacent pipes; a second hoisting module for hoisting the pipe; a second drilling assembly having a second hoisting module for hoisting the pipe, and a top drive, provided on one side of the second hoisting module to be moved in a vertical direction in a state of being away from the first hoisting module, to transmit a driving force for drilling the pipe; a first winding pulley for winding or unwinding a first wire connected to the first hoisting module to move the first hoisting module in the vertical direction; and a second winding pulley for winding or unwinding a second wire connected to the second hoisting module to move the second hoisting module in the vertical direction.

Description

{Winding Apparatus for Continuous Boring}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous-weaving hoisting device, and more particularly, to a hoisting hoisting device designed to be suitably applied to a continuous feeding system.

In the case of drilling rigs to collect oil resources in offshore oil wells and gas wells, various types of drill pipes mounted on drilling rigs can be connected to the drilling rig to construct a drill string, which can be used to form a submarine borehole.

In particular, the tripping process of lowering or raising the drill string from the existing drill ship is accomplished by lifting the unit pipe through a device called Topdrive, aligning the height of the preformed drill string with the center axis, The rough-neck device is connected by rotating the pipe hanging from the top drive.

Therefore, there is a problem that the tripping process becomes a discontinuous process in which the process of connecting or disassembling the pipe is stopped repeatedly, which slows the speed of the entire drilling process.

Therefore, a method for solving such problems is required.

Korean Patent No. 10-1577793

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a continuous operation system capable of performing a continuous process by improving a discontinuous process in a conventional tripping process. So as to provide a hoisting device.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, according to the present invention, there is provided a continuous lifting hoisting apparatus comprising: a first lifting module capable of lifting a pipe; and a lifting / lowering device provided to move up and down in a state of being separated from one side of the first lifting module, A first lifting assembly including a rough neck to be fastened to each other, a second lifting module capable of lifting the pipe, and a second lifting module for lifting the pipe in a state of being spaced apart from the first lifting module, A first hoist assembly including a top drive that transmits a driving force, a first hoist assembly that winds or loosens a first wire connected to the first lifting module to move the first lifting module up and down, and a second lifting assembly coupled to the second lifting module And a second hoisting shear assembly that winds up or unwinds the second wire to move the second lifting module up and down.

And the first hoist assembly comprises a first drawwheel for winding or unwinding the first wire and a second drawwheel disposed directly above the first lifting module and connected directly to the first lifting module by the first wire, Wherein the second hoisting assembly includes a second drawwheel for winding or unwinding the second wire and a second drawwheel disposed directly above the second lifting module for connecting the second wire to the second wire, And a second direct-coupled pulley module directly connected to the lifting module.

The first hoisting-and-hoist assembly further includes a first buffer unit for reducing an impact applied to the first hoisting-and-hoist assembly from the outside, and a second buffer unit provided between the first draw-work and the first- Further comprising a first buffer sheave module directly connected to the first buffer unit by the second buffer sheave unit, wherein the second hoisting-and-off assembly comprises: a second buffer unit for reducing an impact applied to the second hoisting- And a second auxiliary pulley module provided between the second drawwheel and the second direct coupling pulley module and directly connected to the second buffer unit by the second wire.

And wherein the first hoist-and-shear assembly further comprises a first reel that winds and unwraps the first wire together with the first drawwheel, wherein the first direct sheave module is configured such that the pair is symmetrically centered about the first lifting module Wherein the first wire extends from the first drawwheel to the first reel via the pair of first direct sheave modules and the second hoisting shear assembly is coupled to the second drawwheel with the second drawwheel, Further comprising a second reel for winding and unwinding the wire, wherein the second direct sheave module is provided with a pair symmetrically about the second lifting module, and the second wire extends from the second drawwheel And may be extended to the second reel via a second direct-coupled pulley module.

And wherein said first hoisting shear assembly further comprises a first deflector sheave module for di- rectioning said first wire between said pair of first linear sheave modules, And a second direction switching pulley module for switching the direction of the second wire between the second direct-coupled pulley modules.

The first wire and the second wire are connected to each other to form a connection wire. The connection wire is connected to the first draw-work at one side and connected to the second draw-work at the other side. The first winding hoist assembly may further include a third drawwheel that winds or loosens the connecting wire between the first drawwheel and the second drawwheel.

The first hoisting shear assembly also includes a third direction switching pulley module provided directly above the third drawwheel to divert the direction of the connecting wire to the second hoisting flywheel assembly side, And a fourth direction switching sheave module for converting the direction of the connecting wire extending from the third direction switching sheave module to the side of the second direct sheave module.

In order to solve the above-described problems, the continuous-movement hoisting machine of the present invention has the following effects.

First, the entire drilling process can be performed continuously without stopping, which is advantageous in that productivity can be greatly improved.

Second, the up and down movement of the first lifting module and the second lifting module can be easily controlled through the first hoisting shear assembly and the second hoisting hoist assembly optimized for the continuous driving system.

Third, the first and second hoisting pulley assemblies can be provided as various embodiments and thus have an advantage of being excellent in versatility.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are views showing the structure of a continuously moving hoist apparatus according to a first embodiment of the present invention;
FIG. 3 and FIG. 4 are views showing the structure of a continuously moving hoist apparatus according to a second embodiment of the present invention; And
FIG. 5 and FIG. 6 are views showing the structure of a continuously moving hoist apparatus according to a third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

FIG. 1 and FIG. 2 are views showing a structure of a continuously moving hoisting machine according to a first embodiment of the present invention.

1 and 2, the present invention includes a first drilling assembly 10, a second drilling assembly 20, a first hoisting shear assembly 100, a second hoisting shear assembly 200, .

The first drilling assembly 10 includes a first lifting module 12 capable of lifting a pipe and a second lifting module 12 vertically moving in a state of being separated from one side of the first lifting module 12, And a rough neck 16 for fastening the plurality of pipes to each other.

The second drilling assembly 20 is provided with a second lifting module 22 which is capable of lifting the pipe and a second lifting module 22 which is vertically movable in a state of being separated from one side of the second lifting module 22, And a top drive 26 for transmitting a driving force for performance.

That is, in this embodiment, the first lifting module 10 and the roughing neck 16 are provided in the first drilling assembly 10, and the second lifting module 22 and the second lifting module 20 are provided to the second drilling assembly 20, It should be understood that the top drive 26 is provided, but the rough top 16 and the top drive 26 may be alternately applied to each other.

Also, the rough neck 16 and the top drive 26 can be moved up and down through various methods such as a rack and pinion drive system.

The first hoisting flywheel assembly 100 is a component that winds up or unwinds the first wire connected to the first lifting module 12 to move the first lifting module 12 up and down.

The second hoisting assembly 200 is a component that winds up or unwinds a second wire connected to the second lifting module 22 to move the second lifting module 22 up and down.

To this end, the first hoisting-and-hoist assembly 100 and the second hoisting-and-hoist assembly 200 may include a drive device to allow each wire to be rolled or unwound, and a plurality of pulley modules performing various roles .

In this embodiment, the first hoisting-and-hoist assembly 100 includes a first draw-work 110 for winding or unwinding the first wire, and a second draw-work 110 provided directly above the first lifting module 12, And a first direct sheave module 130 directly connected to the first lifting module 12 by one wire.

The second hoisting assembly 200 further includes a second draw-work 210 for winding or unwinding the second wire, and a second draw-work 210 provided directly above the second lifting module 22, And a second direct solenoid pulley module 230 directly connected to the second lifting module 22.

2, in the present embodiment, the first direct sheave module 130 and the second direct sheave module 230 include a double sheave pulley, and the first drawwheel 110 and the second The drawwheel 210 is formed in the form of a single layer winch.

Accordingly, a plurality of first and second wires may be provided and connected to each of the pulleys constituting the first direct sheave module 130 and the second direct sheave module 230.

That is, in this embodiment, the first and second wires are wound or unwound through the first draw-work 110 and the second draw-work 210 in the form of a single-layer winch, The up and down movement of the second lifting module 22 can be controlled.

This method not only reduces the length of the wire but also increases the lifetime of the wire, thereby reducing the inconvenience of wire replacement.

In this embodiment, the first hoisting-and-hoist assembly 100 includes a first buffer unit 105 for reducing an impact applied to the first hoisting-and-hoist assembly 100 from the outside, And a first auxiliary pulley module 120 provided between the first direct coupling shear module 130 and the first direct coupling shear module 130 and directly connected to the first shock absorber unit 105 by the first wire.

The second hoisting machine assembly 200 also includes a second buffer unit 205 for reducing an impact applied to the second hoisting machine assembly 200 from the outside and a second buffer unit 205 for reducing the impact applied to the second hoisting machine assembly 200 from the outside, And a second auxiliary pulley module 220 provided between the two direct coupling pulley modules 230 and directly connected to the second buffer unit 205 by the second wire.

The first cushioning unit 105 and the second cushioning unit 205 may be formed in the form of a hydraulic damper or the like capable of reducing vibration or external impact of the ship for drilling, The module 120 and the second auxiliary pulley module 220 have a combination of a plurality of pulleys provided on the upper side and a pulley provided on the side of the first buffering unit 105 and the second buffering unit 205.

Accordingly, when external vibrations or shocks are applied, the first cushioning unit 105 and the second cushioning unit 205 are moved in a direction in which the first hoisting-and-hoisting assembly 100 and the second hoisting- The phenomenon that the impact is transmitted to the assembly 200 can be minimized.

FIG. 3 and FIG. 4 are views showing the structure of a continuously moving hoist apparatus according to a second embodiment of the present invention.

The second embodiment of the present invention shown in Figs. 3 and 4 is similar to the first embodiment described above except that the first drilling assembly 10 and the second drilling assembly 20 are constructed identically, and the first hoisting- (100) has a first drawwheel (110), a first direct sheave module (130a, 130b), a first shock absorber unit (105) and a first auxiliary sheave module (120a, 120b) 200 have the second drawwheel 210, the second direct sheave module 230a, 230b, the second damping unit 205 and the second auxiliary sheave module 220a, 220b.

However, in the present embodiment, the first hoisting-and-hoist assembly 100 further includes a first reel 116 that winds and unwraps the first wire together with the first drawwheel 110, The assembly 200 further includes a second reel 216 that winds and unwraps the second wire together with the second drawwheel 210.

The pair of first direct sheave modules 130a and 130b may be symmetrically disposed about the first lifting module 12 so that the first wire may extend from the first draw- And the second direct sheave modules 230a and 230b are also extended to the first reel 116 via the first direct sheave modules 130a and 130b so that a pair of the second direct sheave modules 230a and 230b are symmetric about the second lifting module 22 And the second wire extends from the second drawwheel 210 to the second reel 216 via the pair of second direct sheave modules 230a and 230b.

The first reel (116) and the second reel (216) hold the first wire and the second wire wound and stored, respectively. When the first wire and the second wire reach the end of their service life, It can be used for applications.

At this time, the first coupling sheave module 14 for coupling with the sheaves constituting the first direct coupling shear modules 130a and 130b may be provided on the upper portion of the first ascent module 12, The second coupling sheave module 24 for coupling with the sheaves constituting the second direct coupling shear modules 230a and 230b may be provided on the upper part of the double lifting module 22. [

As described above, since the pair of first direct sheave modules 130a and 130b and the pair of second direct sheave modules 230a and 230b are symmetrically disposed, the first hoisting-and-hoist assembly 100 according to the present embodiment has the above- Further comprising a first direction switching pulley module (140) for switching the direction of the first wire between a pair of first direct coupling shear modules (130a, 130b), wherein the second hoisting shear assembly (200) And a second direction switching pulley module 240 for switching the direction of the second wire between the pair of second direct coupling shear modules 230a and 230b.

The first direction switching pulley module 140 and the second direction switching pulley module 240 may include one horizontal pulley unlike other pulley modules, thereby reversing the traveling direction of the wire.

In this embodiment, the first hoisting-and-hoist assembly 100 may include a first range-limiting anchor 117 adjacent to the first reel 116, and the second hoisting- May include a second range limiting anchor (217) adjacent the second reel (216).

When the first wire and the second wire are to be replaced, the first wire and the second wire are fixed, and when the first wire and the second wire are to be replaced, The wire wound around the first reel 116 and the second reel 216 can be loosened and replaced.

FIG. 5 and FIG. 6 are views showing the structure of a continuously moving hoist apparatus according to a third embodiment of the present invention.

In the case of the third embodiment of the present invention shown in Figs. 5 and 6, the above-described second embodiment and the first drilling assembly 10 and the second drilling assembly 20 are constructed identically, The assembly 100 has a first drawwheel 110, a first direct sheave module 130a and 130b, a first shock absorber unit 105 and a first auxiliary sheave module 120a and 120b, The second shock absorber 200 has the second drawwheel 210, the second direct sheave modules 230a and 230b, the second shock absorber 205 and the second auxiliary sheave modules 220a and 220b.

The pair of first direct sheave modules 130a and 130b are symmetrically disposed around the first lifting module 12 and the pair of the second directing sheave modules 230a and 230b are connected to the second lifting module 22 Is symmetrically disposed about the center of the light guide plate.

However, in the present embodiment, the first wire and the second wire are formed so as to be connected to each other continuously to form one connection wire, and one end of the connection wire is connected to the first drawwheel 110 And the other side is connected to the second drawwheel 210.

That is, this embodiment is different from the above-described other embodiments in that both the first lifting module 12 and the second lifting module 22 can be controlled by only one connecting wire.

In particular, in the case of this embodiment, the first hoisting-and-hoist assembly 100 further comprises a third drawwheel 115 that winds or loosens the connecting wire between the first drawwheel 110 and the second drawwheel 210 . That is, the connecting wire is connected from the first drawwheel 110 to the second drawwheel 210 side via the third drawwheel 115.

The driving system using the three drawwools 110, 115, and 210 can save energy compared to the two independent driving systems shown in the above-described embodiments, so that the drawwheels 110, 115, 210) can be applied.

Specifically, the present embodiment can control the up and down movement of the first lifting module 12 when the third draw work 115 and the first draw work 110 are operated in conjunction with each other, and the third draw work 115 And the second drawwheel 210 are operated in conjunction with each other, the up and down movement of the second lifting module 22 can be controlled. When the first drawstring work 110 is operated in conjunction with the second drawstop work 210 while the third drawstop 115 is free to rotate, The modules 22 can be simultaneously controlled in opposite directions.

In this embodiment, the first hoisting-and-hoist assembly 100 is provided directly above the third draw-work 115 so as to switch the direction of the connecting wire to the second hoisting-and-hoist assembly 200 side, Wherein the second hoisting shear assembly (200) includes a pulley module (150) that directs the direction of the connecting wire extending from the third direction switching shear module (150) to the second direct sheave module (230a, 230b) And a fourth direction switching pulley module 250 for converting the first direction switching pulley module 250 to the second direction switching pulley module 250. [

Accordingly, the present embodiment can easily extend one connecting wire to the first drawwheel 110 - the third drawwheel 115 - the second drawwheel 210.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: First drilling assembly 12: First lifting module
20: second drilling assembly 22: second lifting module
100: first hoist assembly 105: first buffer unit
110: first drawwheel 115: third drawwheel
120a, 120b: first auxiliary pulley module 130a, 130b: first direct pulley module
140: first direction switching pulley module 150: third direction switching pulley module
200: Second hoisting assembly 205: Second buffering unit
210: second drawwheel 220a, 220b: second auxiliary pulley module
230a, 230b: second direct-coupled pulley module 240: second-direction switching pulley module
250: Four-way switching pulley module

Claims (7)

A first drilling assembly including a first lifting module capable of lifting a pipe and a roughing neck provided to move up and down in a state of being separated from one side of the first lifting module and fastening adjacent pipes to each other;
A second lifting module including a second lifting module capable of lifting a pipe and a top drive for vertically moving the first lifting module in a state of being separated from the first lifting module and transmitting a driving force for performing drilling to the pipe, ;
A first hoisting shear assembly for lifting or loosening a first wire connected to the first lifting module to move the first lifting module up and down; And
A second hoisting shear assembly moving up and down the second lifting module by winding or unwinding a second wire connected to the second lifting module; / RTI >
The first hoisting hoist assembly comprises:
A first drawwheel for winding or unwinding the first wire; And
A first direct sheave module directly above the first lifting module and directly connected to the first lifting module by the first wire; / RTI >
The second hoisting pulley assembly comprises:
A second drawwheel for winding or unwinding the second wire; And
A second direct sheave module directly above the second lifting module and directly connected to the second lifting module by the second wire; / RTI >
Wherein the first hoist assembly further comprises a first reel for winding and unwinding the first wire together with the first drawwheel,
Wherein the pair of first direct sheave modules are symmetrically disposed about the first lifting module so that the first wire extends from the first drawwheel to the first reel via the pair of first direct sheave modules And,
The second hoisting assembly further comprises a second reel for winding and unwinding the second wire together with the second drawwheel,
Wherein said second direct sheave module is symmetrically disposed about said second lifting module and said second wire extends from said second drawwheel to said second reel via said pair of second direct sheave modules Of the continuous casting machine. A first drilling assembly including a first lifting module capable of lifting a pipe and a roughing neck provided to move up and down in a state of being separated from one side of the first lifting module and fastening adjacent pipes to each other;
A second lifting module including a second lifting module capable of lifting a pipe and a top drive for vertically moving the first lifting module in a state of being separated from the first lifting module and transmitting a driving force for performing drilling to the pipe, ;
A first hoisting shear assembly for lifting or loosening a first wire connected to the first lifting module to move the first lifting module up and down; And
A second hoisting shear assembly moving up and down the second lifting module by winding or unwinding a second wire connected to the second lifting module; / RTI >
The first hoisting hoist assembly comprises:
A first drawwheel for winding or unwinding the first wire; And
A first direct sheave module directly above the first lifting module and directly connected to the first lifting module by the first wire; / RTI >
The second hoisting pulley assembly comprises:
A second drawwheel for winding or unwinding the second wire; And
A second direct sheave module directly above the second lifting module and directly connected to the second lifting module by the second wire; / RTI >
Wherein the first wire and the second wire are connected to each other to form a connection wire,
Wherein one end of the connecting wire is connected to the first drawwalk, the other end is connected to the second drawwheel,
Wherein the first hoisting-and-shear assembly further comprises a third drawwheel which winds or loosens the connecting wire between the first drawwheel and the second drawwheel. 3. The method according to any one of claims 1 to 3,
The first hoisting hoist assembly comprises:
A first shock absorber for reducing an impact applied to the first hoisting machine assembly from the outside; And
A first auxiliary pulley module provided between the first drawwheel and the first direct sheave module and directly connected to the first damping unit by the first wire; Further comprising:
The second hoisting pulley assembly comprises:
A second shock absorber for reducing an impact applied to the second hoisting machine assembly from the outside; And
A second auxiliary pulley module provided between the second drawwheel and the second direct sheave module and directly connected to the second buffer unit by the second wire; Further comprising: delete The method according to claim 1,
Wherein said first hoisting hoist assembly further comprises a first direction switching pulley module for switching the direction of said first wire between said pair of first direct coupling pulley modules,
Wherein said second hoisting hoist assembly further comprises a second direction switching pulley module for switching the direction of said second wire between said pair of second direct coupling shear modules. delete 3. The method of claim 2,
Wherein the first hoisting hoist assembly includes a third direction switching pulley module provided directly above the third drawwheel to convert the direction of the connecting wire to a second hoisting flywheel assembly side,
Wherein the second hoisting-and-off assembly includes a fourth-direction switching sheave module for converting the direction of the connecting wire extending from the third direction switching pulley module to the second direct-shearing module side.
KR1020170034699A 2017-03-20 2017-03-20 Winding Apparatus for Continuous Boring KR101873452B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010098672A1 (en) 2009-02-26 2010-09-02 West Drilling Products As Method for withdrawal and insertion of a drill pipe string in a borehole and also a device for use when practising the method
US20130025937A1 (en) 2010-11-19 2013-01-31 Cameron Rig Solutions, Inc. Systems and Methods for Continuous and Near Continuous Drilling

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010098672A1 (en) 2009-02-26 2010-09-02 West Drilling Products As Method for withdrawal and insertion of a drill pipe string in a borehole and also a device for use when practising the method
US20130025937A1 (en) 2010-11-19 2013-01-31 Cameron Rig Solutions, Inc. Systems and Methods for Continuous and Near Continuous Drilling

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