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US 2010/0059290 A1Published application
Apparatus and system to allow tool passage ahead of a bit
AssigneeThrubit B.V.
InventorsPeter Wells, Jon Macrae
Life of this patent
Estimating the term…
Abstract
Drill bits are enable the use of tools in a wellbore when it is undesirable or impossible to remove the drill bit. Drill bits include a drill bit insert, a latch assembly, a housing, a running tool, and a shaft trigger to operate the latch assembly.
Claims14
A drill bit, comprising:
- a. a drill bit body defining an opening enabling longitudinal passage of an instrument therethrough;
- b. a drill bit insert disposed in the opening;
- c. a latch assembly coupled to the insert and configured to releasably retain the insert in the opening, the latch assembly configured to operate only upon locking engagement therewith of a running tool, the latch assembly disposed in a substantially sealed enclosure.
A running tool, the running tool configured to operate a latch assembly only upon locking engagement therewith, comprising:
- a. a running tool housing, the running tool housing having a circumference and a longitudinal axis;
- b. a drive shaft, the drive shaft extending along longitudinal axis of the running tool and having an outer circumference;
- c. a mating assembly, the mating assembly enclosed within the running tool housing and configured to lockably engage the latch assembly;
- d. a shaft trigger assembly, wherein the shaft trigger assembly is enclosed within the running tool housing and the shaft trigger assembly is configured to substantially prevent rotational movement of the drive shaft;
- and
- e. a torsion spring, the torsion spring mechanically connected to the drive shaft and configured to motivate the drive shaft to rotate.
3 more elements
Dependencies are inferred from the claim text.