Variable orifice sleeve valve hydraulic jar tool
A hydraulic jar tool is described that is connectable to drill string components, comprising: an outer mandrel having one end attachable to a drill string component; an inner mandrel extending into said outer mandrel and having an end portion attachable to a drill string component, said outer and inner mandrels having a splined connection permitting non-rotative reciprocating movement of said mandrels; an anvil and hammer means for producing a jarring action; means forming a substantially confined annular working fluid chamber between said outer and inner mandrels for reception of a working fluid; a sleeve in said chamber slidingly mounted between said outer mandrel and said inner mandrel; said sleeve having a restricted fluid passage extending therethrough; an adjustable orifice plate that connects with said fluid passage; a multiplicity of restricted ofirice passages in said plate of different sizes to provide an adjustable fluid passage past said sleeve; and means for rotating said orifice plate to provide a fluid passage past said sleeve.
- Assignee:
- Dresser Industries Inc
- Patent Number(s):
- US 4211293
- OSTI ID:
- 5011178
- Resource Relation:
- Patent File Date: Filed date 21 Feb 1979
- Country of Publication:
- United States
- Language:
- English
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