INSERT SLOT OF A SLIP ASSEMBLY USED IN DRILLING AND METHOD OF FORMING THE INSERT SLOT

摘要

An insert slot for a slip segment of a rotary slip assembly is described. The insert slot includes a generally rectangular recess formed by milling a single piece of metal which is to be the slip segment, the milled recess thereby forming the insert slot, and a circular hole formed at each of two lower corner locations of the milled recess. The circular corner holes allow a dovetail cutter access into and removal from the recess to make a dovetail cut that creates an angled grove along lengthwise sides of the insert slot, the insert slot having a flat bottom adapted to support a bottom of a tool or grip insert, the insert slot formed in a single piece of metal with no other materials attached thereto, so as to permit an accurate load rating to be determined for the slip assembly.

主权项

1. An insert slot of a rotary slip assembly used in drilling operations, the slip assembly including one or more slip segments, each slip segment including one of more insert slots formed therein, each insert slot configured to secure a corresponding tool or grip insert for gripping a section of drill pipe under tension therein, comprising:
a generally rectangular recess formed by milling a single piece of metal which is to be the slip segment, the milled recess thereby forming the insert slot, and a circular hole formed at each of two lower corner locations of the milled recess, the circular corner holes allowing a dovetail cutter access into and removal from the recess to make a dovetail cut that creates an angled grove along lengthwise sides of the insert slot, the insert slot having a flat bottom adapted to support a bottom of a tool or grip insert, the insert slot formed in a single piece of metal with no other materials attached thereto, so as to permit an accurate load rating to be determined for the slip assembly.