Drilling rig and conversion apparatus
An improved drilling rig and conversion apparatus for drilling rigs is disclosed. The rig includes a percussion assembly jrotatably mounted to a ram above the ground in which drilling is to be made. The rig includes a conversion mandrel structured for insection in, and retention by, the percussion assembly in place of a normally retained bit element. The mandrel has an anvil surface to which percussive strokes of a piston disposed within the percussion assembly for reciprocating movement therein are applied. The mandrel further includes a hammer portion to transfer both the percussive force of the piston and continuous downward pressure applied to the percussion assembly by the ram 30 to a length of casing encircling the drill rod which accomplishes the drilling. The conversion apparatus can, therefore, convert a bottom-hole drilling rig to a top-of-the-hole rig.
- Assignee:
- IFI; EDB-82-027071
- Patent Number(s):
- US 4296821
- OSTI ID:
- 5960688
- Country of Publication:
- United States
- Language:
- English
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