Method and apparatus of a self-aligning sleeve for the correction of the direction of deviated boreholes

Patent · Tue Nov 18 04:00:00 EST 1986

OSTI ID:7076711

Kemp, B W; Brashear, Jr, W S

This patent describes a self-aligning sleeve apparatus slidable over a section of flexible drill string assembly having a rotatable drill bit for correcting the direction of a deviated borehole, comprising: a. a non-rotating tubular sleeve slidable over the member of the flexible drill string assembly adjacent the drill bit; b. first oval shaped protrusion means attached to the sleeve for centering and stabilizing the sleeve while in the borehole; c. second eliptically shaped protrusion means attached to the sleeve for guiding the direction of the drill string assembly, having an exterior circumference greater than first protrusion means and extending substantially around a majority of the sleeve and having vertical fluid passages cut into the body of the protrusion means for the flow of well fluids therethrough; and d. retaining means attached to the lower end of the flexible drill string member preventing the sleeve from sliding off of the flexible drill string member.

• Assignee: NOV; EDB-87-008721; NOV-85-034630
• Patent Number(s): US 4623026
• OSTI ID: 7076711
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALIGNMENT
BOREHOLES
CAVITIES
DIRECTIONAL DRILLING
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLEXIBILITY
FLUID FLOW
MECHANICAL PROPERTIES
MOTION
OIL WELLS
PIPES
POSITIONING
ROTATION
STABILIZATION
TENSILE PROPERTIES
WELLS