Dual impact fluid driven hammering tool
OwnerJason Swinfordinventor
Life of this patent
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Abstract
Disclosed is a fluid hammer tool with two separate fluid hammers in separate sections of the tool. The tool includes an upper poppet valve assembly along one fluid flow path, and a lower poppet valve assembly along a separate outer flow path. Both fluid flow paths are fed from an upper sub and both exit through a lower sub. Both poppet valves include spring return mechanisms. Sealing of each poppet valve propagates an upstream shock wave. The lower poppet valve assembly encounters greater fluid flow and generates a larger shock wave. In the period when the upper poppet valve is closed, the lower poppet valve cannot open.
Claims20
A fluid driven hammering tool comprising an upper sub with a fluid inlet end and a longitudinal bore, and passages connecting the central bore to an outer bore, where the outer bore is defined by the interior of an outer barrel which connects the upper sub with a lower sub;
- a diffuser downstream of the upper sub and having a main bore communicating with a longitudinal bore of the upper sub and with exit passages having a smaller diameter than the main bore, said exit passages being in fluid communication with the main bore, where the exit passages feed a chamber housing an upper poppet valve assembly;
- the upper poppet valve assembly is downstream of the diffuser and includes a first spring return mechanism, wherein a valve stem of said upper poppet valve assembly can move downstream to seal a longitudinal bore of a lower poppet valve assembly, and thereby prevent fluid flow from the chamber into the longitudinal bore of said lower poppet valve assembly, prior to return by the first spring return mechanism;
- and wherein, the longitudinal bore of said lower poppet valve assembly is in fluid communication with a longitudinal bore of the lower sub, from which fluid exits the tool;
- and wherein, said lower poppet valve assembly moves against a second spring return mechanism, and said lower poppet valve assembly can move downstream within the outer barrel to seal against the upstream edge of the lower sub whereupon the second spring return mechanism acts to return said lower poppet valve assembly back upstream;
- and wherein the greatest outer diameter of all portions of said lower poppet valve assembly is less than the inner diameter of the outer barrel.
A fluid driven hammering tool generating two fluid hammers, comprising an upper sub with a fluid inlet end and a longitudinal bore, and passages connecting the longitudinal bore to an outer bore, where the outer bore is defined by the interior of an outer barrel which connects the upper sub with a lower sub;
- a diffuser downstream of the upper sub and having a main bore communicating with longitudinal bore of the upper sub and with exit passages having a smaller diameter than the main bore in fluid communication with the main bore, where the exit passages feed a chamber housing an upper poppet valve assembly;
- the upper poppet valve assembly is downstream of the diffuser and is includes a first spring return mechanism, wherein a valve stem of said upper poppet valve assembly can move downstream to cause compression of the first spring return mechanism and also to seal a longitudinal bore of a lower poppet valve assembly, by contacting an upstream edge of the lower poppet valve assembly, and thereby prevent fluid flow from the chamber into the longitudinal bore of said lower poppet valve assembly whereby a first fluid hammering impact is generated, immediately followed by opening of the upper poppet valve assembly and decompression of the first spring return mechanism;
- and wherein, the longitudinal bore of said lower poppet valve assembly is in fluid communication with a longitudinal bore of the lower sub, from which fluid exits the tool;
- and wherein, the greatest outer diameter of all portions of said lower poppet valve assembly is less than the inner diameter of the outer barrel;
- and wherein, said lower poppet valve assembly moves downstream within the outer barrel to cause compression of a second spring return mechanism and also to to seal against the upstream edge of the lower sub whereby a second fluid hammering impact is generated, immediately followed by opening of the lower poppet valve assembly and decompression of the second spring return mechanism.
Dependencies are inferred from the claim text.