Hydraulic interlock system between casing gripper and spider
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United States of America Patent
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May 14, 2013
Grant Date -
May 19, 2011
app pub date -
Apr 21, 2010
filing date -
Nov 16, 2009
priority date (Note) -
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Abstract
A system for deploying a string of pipe from a drilling rig into a well includes a spider for mounting on a rig floor and a pipe gripper attached to the top drive. A hydraulic safety circuit monitors hydraulic fluid pressure at an apply port of the gripper and prevents hydraulic fluid pressure from being directed to move the slips to the released position if hydraulic fluid pressure is not already present at the apply port of the gripper. The safety circuit also monitors hydraulic fluid pressure at the apply port of the spider and prevents release hydraulic fluid pressure from being directed to move the gripping members to the released position if apply hydraulic fluid pressure is not already present at the apply port of the spider.
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