Method of drilling deviated wellbores

Patent · Tue Oct 06 00:00:00 EDT 1987

OSTI ID:5783933

Dellinger, T B

This patent describes a method of drilling a deviated wellbore into the earth by a rotary drilling technique wherein a drill tool is used to advance a drill bit through the earth and a drilling fluid is circulated down the drill tool and returned from the wellbore in the annulus formed about the drill string. It consists of: (a) drilling a vertical first portion of the wellbore into the earth from a surface location to a kick-off point at about the lower end of the first portion by rotating and advancing the drill tool and drill bit into the earth, (b) initiating a second portion of the wellbore at the kick-off point, (c) withdrawing the drill tool and drill bit from the vertical first portion of the wellbore, (d) running into the vertical first portion of the wellbore a drill tool for drilling the deviated second portion of the wellbore. The drill tool is comprised of a drill string having affixed to its lower end a bottom-hole assembly including a drill bit, a motor for rotating the drill bit, an orientation device for sensing the rotation of the bottom-hole assembly, and an extension sub for providing weight to the drill bit, (e) positioning the drill tool such that the drill bit is a predetermined distance above the wellbore bottom, (f) imparting both rotation and a rapid dynamic movement downward to the drill tool, (g) raising the drill tool so that the drill bit is longer in contact with the wellbore bottom, (h) rotating the bottom-hole assembly so that the axis of rotation of the drill bit is at a desired angular orientation, (i) producing a drilling stroke of the drill bit into the earth below the wellbore bottom, and (j) repeating steps (e) through (i) so as to provide additional drilling strokes for the drilling of the deviated wellbore.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4697651
• OSTI ID: 5783933
• Resource Relation: Patent File Date: Filed date 22 Dec 1986
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
ROTARY DRILLS
DESIGN
DIRECTIONAL DRILLING
BOREHOLES
DRILL BITS
DRILL PIPES
DRILLING FLUIDS
ELECTRIC MOTORS
FLUID FLOW
NATURAL GAS WELLS
OIL WELLS
ROCK DRILLING
ROTARY DRILLING
CAVITIES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FLUIDS
MOTORS
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing