Drilling rig and conversion apparatus

Patent · Tue Oct 27 00:00:00 EST 1981

OSTI ID:5960688

Larson, L

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
• Resource Relation: Patent File Date: Filed date 7 Feb 1980
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
03 NATURAL GAS
DRILLING EQUIPMENT
DESIGN
DRILLING RIGS
WELL DRILLING
DRILLING
EQUIPMENT
020300* - Petroleum- Drilling & Production
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
030300 - Natural Gas- Drilling
Production
& Processing