Method of drilling and casing a well
A well drilling rig having a rotary table for driving a drill string rotatively and having jacking mechanism for lowering casing into the well after drilling, with the jacking mechanism including fluid pressure actuated piston and cylinder means which may be left in the rig during drilling and which are positioned low enough in the rig to avoid interference with operation of the rotary table. The jacking mechanism also includes a structure which is adapted to be connected to the piston and cylinder means when the casing or other well pipe is to be lowered and which is actuable upwardly and downwardly and carries one of two pipe gripping units for progressively jacking the pipe downwardly by vertical reciprocation of that structure. The reciprocating structure may take the form of a beam extending between two pistons and actuable thereby, with a second beam being connected to cylinders within which the pistons are contained and being utilized to support the second gripping element. In one form of the invention, the rotary table when in use is supported by this second beam.
- Assignee:
- Varco International, Inc., Orange, CA
- Patent Number(s):
- US 4421175
- OSTI ID:
- 6948834
- Resource Relation:
- Patent File Date: Filed date 28 Aug 1981; Other Information: PAT-APPL-297120
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DRILL PIPES
EMPLACEMENT
GRABS
DESIGN
HOISTS
WELL CASINGS
CYLINDERS
DRILLING RIGS
FLUID MECHANICS
HOISTING
HYDRAULIC EQUIPMENT
HYDRAULIC FLUIDS
OPERATION
PISTONS
ROTARY DRILLING
WELL DRILLING
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLUIDS
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
MECHANICS
PIPES
WORKING FLUIDS
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)