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US 7,921,926 B2Granted
Jointed spearhead assembly
AssigneeLongyear TM, Inc.
InventorsChristopher L. Drenth, George Ibrahim, Anthony Lachance
Life of this patent
Estimating the term…
Abstract
A jointed spearhead assembly can include a base portion that is adapted to be connected to a down-hole object and a spearhead portion having a first end and a second. The second end includes a follower tab with a non-convex first follower interface. The spearhead portion can be pivotally coupled to the base portion.
Claims27
A jointed spearhead assembly, comprising:
- a base portion adapted to be connected to a down-hole object, the base portion comprising a recess that receives a follower and a biasing member;
- and
- a spearhead portion having a first end and a second end, the second end including a follower tab with a non-convex first follower interface, the spearhead portion being pivotally coupled to the base portion.
A jointed spearhead assembly, comprising:
- a base portion containing a recess that opens into a slot defined by a plurality of arms, wherein a follower and a bias portion are at least partially disposed within the recess;
- and
- a spearhead portion comprising an overshot connector and a follower tab, wherein the follower tab comprises a first follower interface that is substantially flat and disposed at a first end,
- wherein the follower tab is pivotally connected between the plurality of arms of the base portion, and wherein the follower contacts the first follower interface to provide the spearhead portion with a detent position.
1 more element
A drilling system, comprising:
- a jointed spearhead assembly containing:
- a base portion containing a recess that opens into a slot defined by a plurality of arms, wherein a follower and a bias portion are substantially disposed within the recess;
- and
- a spearhead portion comprising an overshot connector and a follower tab, wherein the follower tab comprises a first follower interface that is substantially flat and disposed at a first end,
- wherein the follower tab is pivotally connected between the plurality of arms of the base portion, and wherein the follower contacts the first follower interface to provide the spearhead portion with a detent position;
- and
- a downhole object connected to the base portion.
4 more elements
A method for drilling, comprising
- providing a jointed spearhead assembly containing a base portion containing a recess that opens into a slot defined by a plurality of arms, wherein a follower and a bias portion are substantially disposed within the recess, and a spearhead portion comprising an overshot connector and a follower tab, wherein the follower tab comprises a first follower interface that is substantially flat;
- pivotally connecting the follower tab of the spearhead portion between the plurality of arms of the base portion so that the follower contacts the first follower interface to provide the spearhead portion with a detent position;
- coupling the spearhead assembly to an overshot assembly;
- and
- raising or lowering the coupled spearhead assembly and overshot assembly in a borehole.
2 more elements
Dependencies are inferred from the claim text.