Shaft drilling rig

Patent · Tue Jun 17 00:00:00 EDT 1986

OSTI ID:5599735

Wada, M; Ajiro, S

A shaft drilling rig is described which consists of: a supporting structure for a drill string having a plurality of components for drilling a shaft into the earth by imparting a turning and thrust for drilling at least to a drill bit on the drill string, the drilling being down to a predetermined depth, and then a further drill string component having at least at the bottom end thereof an inner wall extending substantially in the axial direction of the component being newly added to the drill string for further drilling; means for receiving at least the bottom end of the further drill string component and for supporting it, and having a member with the outer circumference engageable with the inner wall of the further component, the receiving means supporting the further drill string component in a free standing position; means for supporting the receiving means and having a guiding device for guiding the receiving means between a position where the further drill string component is to be added to the drill string and a parking position spaced laterally of the drill string from the first mentioned position; and means for holding a lower part of the drill string which has been separated from the upper part of the drill string preparatory to adding the further drill string component so that the axis of the lower part is substantially aligned with the drilling direction.

• Assignee: Hitachi Construction Machinery Co., Ltd., Tokyo
• Patent Number(s): US 4595065
• OSTI ID: 5599735
• Resource Relation: Patent File Date: Filed date 23 May 1983
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
DRILLING RIGS
DESIGN
ALIGNMENT
DEPTH
DRILL BITS
DRILL PIPES
FASTENERS
NATURAL GAS WELLS
OIL WELLS
POSITIONING
SPACE DEPENDENCE
SUPPORTS
WELL DRILLING
DIMENSIONS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
MECHANICAL STRUCTURES
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing