WO2010123375A1 - Stroker device - Google Patents

Stroker device Download PDF

Info

Publication number
WO2010123375A1
WO2010123375A1 PCT/NO2010/000144 NO2010000144W WO2010123375A1 WO 2010123375 A1 WO2010123375 A1 WO 2010123375A1 NO 2010000144 W NO2010000144 W NO 2010000144W WO 2010123375 A1 WO2010123375 A1 WO 2010123375A1
Authority
WO
WIPO (PCT)
Prior art keywords
stroker
borehole
module
grippers
propulsive
Prior art date
Application number
PCT/NO2010/000144
Other languages
French (fr)
Inventor
Karl Einar Ferkingstad
Arne Motland
Rune Bjørndal
Original Assignee
Aker Well Service 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 Aker Well Service As filed Critical Aker Well Service As
Priority to CA2759539A priority Critical patent/CA2759539C/en
Priority to EA201190180A priority patent/EA022110B1/en
Priority to EP10767354.3A priority patent/EP2422037B1/en
Priority to US13/264,088 priority patent/US8739891B2/en
Priority to DK10767354.3T priority patent/DK2422037T3/en
Priority to BRPI1016180 priority patent/BRPI1016180B1/en
Publication of WO2010123375A1 publication Critical patent/WO2010123375A1/en
Priority to US14/269,900 priority patent/US9121241B2/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion
    • E21B23/0411—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for anchoring tools or the like to the borehole wall or to well tube
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/18—Anchoring or feeding in the borehole

Definitions

  • the present invention relates to a stroker.
  • the invention relates more particularly to a stroker for use in a borehole in the ground, the stroker at least comprising an actuator ar- ranged for being able to displace a tool in the longitudinal direction of the borehole, and grippers arranged to anchor the stroker to the wall of the borehole, alternatively to a pipe wall.
  • a stroker is typically four to six meters long, while a wireline tractor is generally about five to seven meters long.
  • the overall length can therefore be up to thirteen meters, which might lead to sluicing problems at the surface valve and complicate downhole operations.
  • a further disadvantage with prior art stroker-wireline tractors is that the control system for one of the units must be switched off in order to operate the other. This is because the two machines utilize the same cables in the wireline for power supply and control. It is known that this lack of simultaneous control, due to gravitation and forces from fluid flowing in the borehole, may result in displacement of the wireline tractor during the time span between disconnection of the wireline tractor' s control system and the anchoring of the stroker, which might cause failure of the downhole work operation.
  • a stroker for use in a borehole in the ground, the stroker comprising at least an actuator arranged for displacing a tool in the longitudinal direction of the borehole, and grippers arranged to anchor the stroker in the wall of the borehole, alternatively to a pipe wall, wherein the stroker is provided with driving wheels or driving belts for propulsion.
  • At least the grippers and the propulsive module can be con- trolled through a common control module and power can be supplied through a common power means.
  • the actuator, grippers and propulsive module can be supplied with hydraulic pressure fluid from a common hydraulic module. It is thus well arranged for controlling the different functions, including propulsion, simultaneously from a common control means, power supply and hydraulic module.
  • a stroker in accordance with the present invention is considerably more flexible in the work operations than a prior art stroker-wireline tractor.
  • Fig. 1 shows a schematic view of the stroker in accordance with the present invention, during displacement in a borehole
  • Fig. 2 shows a schematic view of a lower part of the stroker in fig. 1, the stroker being anchored to the wall of the borehole.
  • the reference number 1 indicates a stroker located in a borehole 2 in the ground 4.
  • the borehole 2 can, in a way known per se, be cased and provided with not shown completion pipes in which the stroker is displaced.
  • the stroker 1 comprises an actuator 6 with a bolt- or piston rod, indicated below as an actuator rod 8, being arranged to displace a tool 10 of any known type in the longitudinal direction of the borehole 2.
  • the stroker 1 further comprises a hydraulic module 12, a gripper module 14, a propulsive module 16, a control module 18 and a power module 20.
  • the stroker 1 is connected to necessary but not shown utility equipment known per se, at the surface by means of a wireline 22 comprising power- and control cables 24.
  • the hydraulic module 12, the gripper module 14 with grippers 26, the control module 18 and the power module 20, and also not shown pipes and cables for connection, are designed in a way known per se for a stroker, but are extended to comprise the propulsive module 16 as well.
  • the propulsive module 16 is designed with a first set of driving wheels 28 and a second set of driving wheels 30 which are mutually rotated 90 degrees about the longitudinal axis 32 of the stroker 1.
  • Each set of driving wheels 28, 30 comprise four driving wheels 34 forced to the wall 36 of a borehole 2 by means of accompanying driving wheel arms 38.
  • Two of the driving wheels 34 are arranged on radially opposite side of the propulsive means 16 relatively the other two driving wheels 34.
  • the first and the second driving module 28, 30 are thereby centering the propulsive means 16 in the borehole 2.
  • the propulsive means 16 is designed in a way known per se from the art of wireline tractors.
  • the stroker 1 When an operation is to be carried out by means of the tool 10 at a certain position in the borehole 2, the stroker 1 is driven by the propulsive module 16 to the operation position.
  • the driving wheels 34 are forced to the wall 36 of the borehole during the propulsion and after the stroker 1 has stopped at the operation position.
  • the driving wheels 34 are also controlled as the grippers 26 of the gripper module 14 are forced to the wall 36 of the borehole.
  • the stroker 1 is thereby prevented from displacement in the borehole 2 as the grippers 26 are forced up.

Abstract

A stroker device (1) for use in a borehole (2) in the ground, the stroker (1) at least comprising an actuator (6) arranged for displacing a tool (10) in a longitudinal direction of the borehole (2), and grippers (26) arranged to anchor the stroker (1) to the wall (36) of the borehole (2), alternatively to a pipe wall, wherein the stroker (1) is provided with driving wheels (34) or driving belts for propulsion.

Description

STROKER DEVICE
The present invention relates to a stroker. The invention relates more particularly to a stroker for use in a borehole in the ground, the stroker at least comprising an actuator ar- ranged for being able to displace a tool in the longitudinal direction of the borehole, and grippers arranged to anchor the stroker to the wall of the borehole, alternatively to a pipe wall.
The English term stroker is used in the original description as the term is common in the petroleum industry.
During downhole work operations, especially in so-called deviated wells, it is common practice to connect a wireline tractor to a stroker to enable displacement of the stroker to the work location.
A stroker is typically four to six meters long, while a wireline tractor is generally about five to seven meters long. The overall length can therefore be up to thirteen meters, which might lead to sluicing problems at the surface valve and complicate downhole operations.
A further disadvantage with prior art stroker-wireline tractors is that the control system for one of the units must be switched off in order to operate the other. This is because the two machines utilize the same cables in the wireline for power supply and control. It is known that this lack of simultaneous control, due to gravitation and forces from fluid flowing in the borehole, may result in displacement of the wireline tractor during the time span between disconnection of the wireline tractor' s control system and the anchoring of the stroker, which might cause failure of the downhole work operation.
It is the object of the present invention to remedy or reduce at least one of the disadvantages with prior art.
The object is achieved in accordance with the present invention, by the features given in the description below, and in the subsequent claims .
There is provided a stroker for use in a borehole in the ground, the stroker comprising at least an actuator arranged for displacing a tool in the longitudinal direction of the borehole, and grippers arranged to anchor the stroker in the wall of the borehole, alternatively to a pipe wall, wherein the stroker is provided with driving wheels or driving belts for propulsion.
By providing the stroker with a propulsive module renders the connection to a wireline tractor superfluous, even during operations in deviated wells. This results in a considerably reduced overall length compared to prior art.
At least the grippers and the propulsive module can be con- trolled through a common control module and power can be supplied through a common power means.
The actuator, grippers and propulsive module can be supplied with hydraulic pressure fluid from a common hydraulic module. It is thus well arranged for controlling the different functions, including propulsion, simultaneously from a common control means, power supply and hydraulic module.
Even if oil-hydraulics is normally used, the actuator, grip- pers and the propulsive means, might, given the right conditions, separately or collectively be electrically driven.
The provided stroker solves a long felt problem in relation to overall length and lack of co-ordination of assembled machines in connection with a wireline. A stroker in accordance with the present invention is considerably more flexible in the work operations than a prior art stroker-wireline tractor.
In the following is described an example of a preferred embodiment which is illustrated in the enclosed drawings, where :
Fig. 1 shows a schematic view of the stroker in accordance with the present invention, during displacement in a borehole; and
Fig. 2 shows a schematic view of a lower part of the stroker in fig. 1, the stroker being anchored to the wall of the borehole.
In the drawings the reference number 1 indicates a stroker located in a borehole 2 in the ground 4. The borehole 2 can, in a way known per se, be cased and provided with not shown completion pipes in which the stroker is displaced.
The stroker 1 comprises an actuator 6 with a bolt- or piston rod, indicated below as an actuator rod 8, being arranged to displace a tool 10 of any known type in the longitudinal direction of the borehole 2. The stroker 1 further comprises a hydraulic module 12, a gripper module 14, a propulsive module 16, a control module 18 and a power module 20. The stroker 1 is connected to necessary but not shown utility equipment known per se, at the surface by means of a wireline 22 comprising power- and control cables 24.
The hydraulic module 12, the gripper module 14 with grippers 26, the control module 18 and the power module 20, and also not shown pipes and cables for connection, are designed in a way known per se for a stroker, but are extended to comprise the propulsive module 16 as well.
The propulsive module 16 is designed with a first set of driving wheels 28 and a second set of driving wheels 30 which are mutually rotated 90 degrees about the longitudinal axis 32 of the stroker 1. Each set of driving wheels 28, 30 comprise four driving wheels 34 forced to the wall 36 of a borehole 2 by means of accompanying driving wheel arms 38.
Two of the driving wheels 34 are arranged on radially opposite side of the propulsive means 16 relatively the other two driving wheels 34. The first and the second driving module 28, 30 are thereby centering the propulsive means 16 in the borehole 2.
Incidentally, the propulsive means 16 is designed in a way known per se from the art of wireline tractors.
When an operation is to be carried out by means of the tool 10 at a certain position in the borehole 2, the stroker 1 is driven by the propulsive module 16 to the operation position. The driving wheels 34 are forced to the wall 36 of the borehole during the propulsion and after the stroker 1 has stopped at the operation position. The driving wheels 34 are also controlled as the grippers 26 of the gripper module 14 are forced to the wall 36 of the borehole. The stroker 1 is thereby prevented from displacement in the borehole 2 as the grippers 26 are forced up.
In fig. 2 the stroker 1 is anchored to the wall 36 of the borehole by means of the grippers 26, as the actuator rod 8 displaces the tool 10 during execution of the work.

Claims

C l a i m s
1. A stroker device (1) for use in a borehole (2) in the ground, the stroker (1) at least comprising an actuator (6) arranged for displacing a tool (10) in a lon- gitudinal direction of the borehole (2) , and grippers (26) arranged to anchor the stroker (1) to the wall (36) of the borehole (2) , alternatively to a pipe wall, c ha r a c t e r i z e d i n t ha t the stroker (1) is provided with driving wheels (34) or driving belts for propulsion.
2. The stroker means as claimed in claim 1, c h a r a c t e r i z e d i n t ha t at least the grippers (26) and a propulsive module (16) are controlled by a common control module (18) .
3. The stroker means as claimed in claim 1, c h a r a c t e r i z e d i n t ha t at least the grippers (26) and the propulsive module (16) are provided with power from a common power module (20) .
4. The stroker means as claimed in claim 1, c h a r - a c t e r i z e d i n t ha t the actuator (6) , the grippers (26) and the propulsive module (16) are supplied with hydraulic pressure fluid from a common hydraulic module (12) .
PCT/NO2010/000144 2009-04-22 2010-04-19 Stroker device WO2010123375A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CA2759539A CA2759539C (en) 2009-04-22 2010-04-19 Stroker device
EA201190180A EA022110B1 (en) 2009-04-22 2010-04-19 Stroker device
EP10767354.3A EP2422037B1 (en) 2009-04-22 2010-04-19 Stroker device
US13/264,088 US8739891B2 (en) 2009-04-22 2010-04-19 Stroker device
DK10767354.3T DK2422037T3 (en) 2009-04-22 2010-04-19 Stroker device
BRPI1016180 BRPI1016180B1 (en) 2009-04-22 2010-04-19 stroker
US14/269,900 US9121241B2 (en) 2009-04-22 2014-05-05 Stroker device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20091611A NO330959B1 (en) 2009-04-22 2009-04-22 Device by strokes
NO20091611 2009-04-22

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/264,088 A-371-Of-International US8739891B2 (en) 2009-04-22 2010-04-19 Stroker device
US14/269,900 Continuation US9121241B2 (en) 2009-04-22 2014-05-05 Stroker device

Publications (1)

Publication Number Publication Date
WO2010123375A1 true WO2010123375A1 (en) 2010-10-28

Family

ID=43011292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2010/000144 WO2010123375A1 (en) 2009-04-22 2010-04-19 Stroker device

Country Status (8)

Country Link
US (2) US8739891B2 (en)
EP (1) EP2422037B1 (en)
BR (1) BRPI1016180B1 (en)
CA (1) CA2759539C (en)
DK (1) DK2422037T3 (en)
EA (1) EA022110B1 (en)
NO (1) NO330959B1 (en)
WO (1) WO2010123375A1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2505768A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Modular downhole tool
EP2505770A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Torque member
EP2505771A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Arm assembly
EP2505769A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Service panel
EP2505767A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Fail-safe spring
EP2505772A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Hydraulic assembly
WO2012150864A1 (en) * 2011-05-04 2012-11-08 Aker Well Service As Method and device for cleaning the upper portion of a well
EP2615239A1 (en) * 2012-01-02 2013-07-17 GeoSea NV Device and method for drilling shafts in a ground consisting of rock, clay and/or related materials
WO2013129938A1 (en) * 2012-02-28 2013-09-06 West Production Technology As Feeding device for a downhole tool and method for axial feeding of a downhole tool
CN103459757A (en) * 2011-03-30 2013-12-18 韦尔泰克有限公司 Downhole driving unit having hydraulic motor in wheel
US20140311757A1 (en) * 2011-11-30 2014-10-23 Welltec A/S Pulling tool
WO2015112022A1 (en) * 2014-01-24 2015-07-30 Altus Intervention As Wireline tractor comprising a disc-shaped cutting device for perforating of a tubing wall and method for perforating a tubing wall
WO2016010436A1 (en) * 2014-07-17 2016-01-21 C6 Technologies As A petroleum well downhole mechanical services platform tool
NO20150865A1 (en) * 2015-07-03 2017-01-04 Qinterra Tech As Method of removing equipment from a section of a wellbore and related apparatus
US10240433B2 (en) 2012-01-10 2019-03-26 Qinterra Technologies As Hydrate plug remover
US10370920B2 (en) 2014-07-14 2019-08-06 Aarbakke Innovation As Wellbore intervention tool for penetrating obstructions in a wellbore
US11441370B2 (en) 2015-04-01 2022-09-13 Qinterra Technologies As Apparatus for use in a tractor in a wellbore and methods

Families Citing this family (2)

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NO330959B1 (en) * 2009-04-22 2011-08-29 Aker Well Service As Device by strokes
US20160237812A1 (en) * 2013-09-30 2016-08-18 Schlumberger Technology Corporation Fiber Optic Slickline and Tractor System

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WO1995021987A1 (en) * 1994-02-14 1995-08-17 Norsk Hydro A.S Locomotive or tractor for pulling equipment in a pipe or drill hole
EP1029147A1 (en) 1997-11-07 2000-08-23 Omega Completion Technology Limited Reciprocating running tool
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AU2012234263B2 (en) * 2011-03-30 2015-07-09 Welltec A/S Arm assembly
US9512688B2 (en) 2011-03-30 2016-12-06 Welltec A/S Arm assembly
EP2505771A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Arm assembly
EP2505769A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Service panel
EP2505767A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Fail-safe spring
EP2505772A1 (en) * 2011-03-30 2012-10-03 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
WO2012130940A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Service panel
WO2012130943A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Torque member
WO2012130942A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Fail-safe spring
WO2012130944A1 (en) * 2011-03-30 2012-10-04 Welltec A/S Hydraulic assembly
US9708873B2 (en) 2011-03-30 2017-07-18 Welltec A/S Hydraulic assembly
US9523253B2 (en) 2011-03-30 2016-12-20 Welltec A/S Torque member
US9518437B2 (en) 2011-03-30 2016-12-13 Welltec A/S Modular downhole tool
US9494001B2 (en) 2011-03-30 2016-11-15 Welltec A/S Service panel
CN103459762A (en) * 2011-03-30 2013-12-18 韦尔泰克有限公司 Hydraulic assembly
CN103459757A (en) * 2011-03-30 2013-12-18 韦尔泰克有限公司 Downhole driving unit having hydraulic motor in wheel
CN103477022A (en) * 2011-03-30 2013-12-25 韦尔泰克有限公司 Arm assembly
CN103477023A (en) * 2011-03-30 2013-12-25 韦尔泰克有限公司 Torque member
RU2599819C2 (en) * 2011-03-30 2016-10-20 Веллтек А/С Lever assembly
US9097087B2 (en) 2011-03-30 2015-08-04 Welltec A/S Fail-safe spring
EP2505768A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Modular downhole tool
EP2505770A1 (en) * 2011-03-30 2012-10-03 Welltec A/S Torque member
US9435167B2 (en) 2011-03-30 2016-09-06 Welltec A/S Downhole driving unit having a hydraulic motor in a wheel
GB2504870A (en) * 2011-05-04 2014-02-12 Aker Well Service As Method and device for cleaning the upper portion of a well
DK178294B1 (en) * 2011-05-04 2015-11-09 Altus Intervention As Method and device for cleaning the upper portion of a well
GB2504870B (en) * 2011-05-04 2018-05-16 Altus Intervention As Method and device for cleaning the upper portion of a well
WO2012150864A1 (en) * 2011-05-04 2012-11-08 Aker Well Service As Method and device for cleaning the upper portion of a well
US9695658B2 (en) * 2011-11-30 2017-07-04 Welltec A/S Pulling tool
US20140311757A1 (en) * 2011-11-30 2014-10-23 Welltec A/S Pulling tool
EP2615239B1 (en) 2012-01-02 2019-10-30 GeoSea NV Device and method for drilling shafts in a ground consisting of rock, clay and/or related materials
BE1020365A4 (en) * 2012-01-02 2013-08-06 Geosea N V DEVICE AND METHOD FOR DRILLING SHAFTES IN A SURFACE MADE OF ROCK, CLAY AND / OR RELATED MATERIALS.
EP2615239A1 (en) * 2012-01-02 2013-07-17 GeoSea NV Device and method for drilling shafts in a ground consisting of rock, clay and/or related materials
US10240433B2 (en) 2012-01-10 2019-03-26 Qinterra Technologies As Hydrate plug remover
WO2013129938A1 (en) * 2012-02-28 2013-09-06 West Production Technology As Feeding device for a downhole tool and method for axial feeding of a downhole tool
US9932789B2 (en) 2012-02-28 2018-04-03 West Production Technology As Feeding device for a downhole tool and method for axial feeding of a downhole tool
US10683719B2 (en) 2014-01-24 2020-06-16 Qinterra Technologies As Wireline tractor comprising a disc-shaped cutting device for perforating of a tubing wall and method for perforating a tubing wall
WO2015112022A1 (en) * 2014-01-24 2015-07-30 Altus Intervention As Wireline tractor comprising a disc-shaped cutting device for perforating of a tubing wall and method for perforating a tubing wall
GB2538403A (en) * 2014-01-24 2016-11-16 Qinterra Tech As Wireline tractor comprising a disc-shaped cutting device for perforating of a tubing wall and method for perforating a tubing wall
GB2538403B (en) * 2014-01-24 2020-08-26 Qinterra Tech As Wireline tractor comprising a disc-shaped cutting device for perforating of a tubing wall and method for perforating a tubing wall
US10370920B2 (en) 2014-07-14 2019-08-06 Aarbakke Innovation As Wellbore intervention tool for penetrating obstructions in a wellbore
WO2016010436A1 (en) * 2014-07-17 2016-01-21 C6 Technologies As A petroleum well downhole mechanical services platform tool
US11441370B2 (en) 2015-04-01 2022-09-13 Qinterra Technologies As Apparatus for use in a tractor in a wellbore and methods
NO342686B1 (en) * 2015-07-03 2018-07-02 Qinterra Tech As A tool string for removing equipment from a wellbore, and related method
US10605028B2 (en) 2015-07-03 2020-03-31 Qinterra Technologies As Method of removing equipment from a section of a wellbore and related apparatus
NO20150865A1 (en) * 2015-07-03 2017-01-04 Qinterra Tech As Method of removing equipment from a section of a wellbore and related apparatus

Also Published As

Publication number Publication date
CA2759539A1 (en) 2010-10-28
US20140238695A1 (en) 2014-08-28
EP2422037A4 (en) 2017-06-14
EP2422037B1 (en) 2021-07-21
DK2422037T3 (en) 2021-09-20
EA022110B1 (en) 2015-11-30
NO20091611L (en) 2010-10-25
US8739891B2 (en) 2014-06-03
EA201190180A1 (en) 2012-05-30
EP2422037A1 (en) 2012-02-29
NO330959B1 (en) 2011-08-29
US9121241B2 (en) 2015-09-01
US20120037358A1 (en) 2012-02-16
BRPI1016180B1 (en) 2019-12-03
BRPI1016180A2 (en) 2017-10-24
CA2759539C (en) 2017-05-30

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