METHOD OF DISCONNECTING A DRILL STRING AT A DRILL RIG

Title:

METHOD OF DISCONNECTING A DRILL STRING AT A DRILL RIG

Document Type and Number:

WIPO Patent Application WO/2014/183931

Kind Code:

A3

Abstract:

Method and apparatus for disconnecting an end rod (115) from a drill string (100) coupled together by a threaded connection (604, 605). Rod handling apparatus (102) comprises a gripper unit (106) having a 'floating'sled (206) with a sensor unit (208) configured to monitor relative axial position of the sled relative to a frame (205) of the gripper unit to determine a decoupling of the threaded connection and a separation of an end rod from the drill string.

Inventors:

LARSSON LARS-ERIK (SE)
JELGERT JOHAN (SE)
VILÉN PER (SE)
EVERMARK KENT (SE)

Application Number:

PCT/EP2014/057157

Publication Date:

April 23, 2015

Filing Date:

April 09, 2014

Export Citation:

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Assignee:

SANDVIK INTELLECTUAL PROPERTY (SE)

International Classes:

E21B7/02; E21B19/15; E21B19/16; E21B19/20; E21B19/24

Domestic Patent References:

WO2011129760A1

2011-10-20

Foreign References:

US20120297933A1	2012-11-29
US4604724A	1986-08-05
US20120213937A1	2012-08-23
US20050056122A1	2005-03-17

Attorney, Agent or Firm:

HAMMARSJÖ, Joakim (Sandviken, SE)

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