Jar
Patent
·
OSTI ID:5156532
This patent describes a jar apparatus adapted for mounting in a tubular well conduit to enable contained internal flow of well fluids and for delivering a controlled impact force in either longitudinal direction to the well conduit when positioned in a well bore. It comprises: a first inner tubular member forming a longitudinally extending flow passage and having means for releasably mounting the inner tubular member in the well conduit with the flow passage communicating with the bore of the tubular well conduit; a second outer tubular member forming a longitudinally extending flow passage and having means for releasably connecting the outer tubular member in the well conduit with the flow passage communicating with the bore of the tubular well conduit; means on the outer tubular member and the inner tubular member for preventing relative circumferential rotational movement while enabling a limited range of telescoping movement therebetween; anvil means mounted on the outer tubular member for receiving a hammer blow from the inner tubular member; hammer means formed on the inner tubular member for impacting the anvil means on the outer tubular member for impacting the anvil means on the outer tubular member to impact a shock force to the outer tubular member; at least two vertically spaced securing means mounted between the inner and outer tubular members for releasably securing the tubular members together in a ready cocked position intermediate the longitudinal operating stroke for the delivery of a hammer blow from either longitudinal direction; the cocked intermediate position of the securing means for an upward hammer blow being at a different time and at a different intermediate position of the securing means of the operating stroke from the cocked intermediate position for a downward hammer blow.
- Assignee:
- NOV; EDB-92-114804; NOV-92-031024
- Patent Number(s):
- US 5103903; A
- Application Number:
- PPN: US 7-625000
- OSTI ID:
- 5156532
- Country of Publication:
- United States
- Language:
- English
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