Impact drilling tool
A fluid operated impact drilling tool has a hammer slidably mounted in a casing connected to a string of drilling pipe. Inside the casing above the hammer is mounted a valve. Both the valve and hammer have reciprocal sliding movement along the longitudinal axis of the tool to substantially interrupt flow of a drilling fluid therethrough. Movement of the valve and hammer predominantly results from different pressures acting on separate pressure areas of the valve and hammer. The hammer may impact either an anvil or a bit attached thereto. Wear on the valve and hammer is reduced by smooth, hardened surfaces at locations subject to wear. A trapped fluid may also be used in an alternative embodiment to dampen the shock effect of the valve as it reaches its upper and lower stops.
- Assignee:
- Bassinger Tool Enterprises, Ltd.
- Patent Number(s):
- US 4044844
- OSTI ID:
- 7278433
- Resource Relation:
- Patent File Date: Filed date 19 Jul 1976
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pneumatic impact drilling tool
Well tool and method of use therefor