Automatic hydraulic thruster

Patent · Tue Oct 07 00:00:00 EDT 1986

OSTI ID:5061603

Garrett, W R

This patent describes an automatic hydraulic thruster which consists of a tubular mandrel having hither and farther ends adapted respectively for connection to hither and farther drill string components, the hither component to extend in from a hole bore entrance and the farther component to be connected to a drill bit; a sleeve concentrically disposed about the mandrel for rotation and axial motion of the mandrel within the sleeve and axial motion of the sleeve relative to the mandrel; annular piston means carried by the mandrel sealingly engaging the interior of the sleeve and dividing the annulus between the mandrel and sleeve into first and second chambers adjacent the hither and farther ends of the sleeve; means sealing between the mandrel and sleeve at diameters smaller than that of the piston closing the ends of the chambers farthest from the piston; and wall anchor means carried by the sleeve responsive to pressure differential between the first chamber and the ambient outside the thruster to move outwardly to engage a hole bore when the first chamber pressure is lighter than the ambient and to relax from such engagement upon equalization of the pressure in the first chamber and the ambient.

• Assignee: Smith International, Newport Beach, CA
• Patent Number(s): US 4615401
• OSTI ID: 5061603
• Resource Relation: Patent File Date: Filed date 24 May 1985
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
WELL DRILLING
HYDRAULIC EQUIPMENT
CONTROL SYSTEMS
DEPRESSURIZATION
DRILL BITS
DRILL PIPES
NATURAL GAS WELLS
OIL WELLS
PISTONS
PRESSURE CONTROL
ROTATION
SEALS
VALVES
CONTROL
CONTROL EQUIPMENT
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MOTION
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)