Invention Grant
- Patent Title: Drillable and resettable wellbore obstruction-clearing tool
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Application No.: US15165970Application Date: 2016-05-26
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Publication No.: US10221657B2Publication Date: 2019-03-05
- Inventor: Randy Gosselin
- Applicant: LONGHORN CASING TOOLS INC.
- Applicant Address: CA Calgary
- Assignee: LONGHORN CASING TOOLS INC.
- Current Assignee: LONGHORN CASING TOOLS INC.
- Current Assignee Address: CA Calgary
- Agency: Parlee McLaws LLP (CGY)
- Agent Sean Goodwin; Linda Thompson
- Main IPC: E21B37/00
- IPC: E21B37/00 ; E21B17/07 ; E21B43/10

Abstract:
Embodiments of a reciprocating tool, used to engage and clear obstructions in a wellbore, have a biasing spring located externally about an axially reciprocating and rotatable sleeve to act between the rotatable sleeve and the non-rotatable mandrel to bias the rotatable sleeve to an extended position. During a drill out operation, a non-rotatable sleeve, connected to the mandrel for telescoping over the mandrel and the rotatable sleeve during a downstroke of the mandrel, guides a drill string for drill-out of at least the mandrel and other internal components. Positioning the biasing spring external to the rotating sleeve and downhole of the non-rotating sleeve prevents engaging the spring with the drill string. The rotating sleeve provides an internal guide for the drill out string to further avoid engagement with the spring.
Public/Granted literature
- US20160348472A1 DRILLABLE AND RESETTABLE WELLBORE OBSTRUCTION-CLEARING TOOL Public/Granted day:2016-12-01
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