Downhole rate of penetration measurement
AssigneeSchlumberger Technology Corporation
InventorsMalcolm Taylor, Scott R. Woolston, Jonathan D. Marshall, David Hoyle
Life of this patent
Estimating the term…
Abstract
A method for determining a rate of penetration of a drill bit during an earth drilling operation may comprise first urging an element to extend out from a working face of the drill bit. As drilling progresses, this extended element may then be forced back into the drill bit by an internal surface of a borehole being formed. A rate at which the element retracts back into the working face may be measured to aid in estimating a rate of penetration of the drill bit into the earth.
Claims19
A method for determining a rate of penetration of a downhole drilling operation, comprising:
- urging an element to extend from a working face of a drill bit, wherein urging the element to extend is performed once a specific retraction displacement of the element is reached, and the element is free to rotate relative to the working face of the drill bit;
- and
- measuring a rate of retraction of the element into the working face due to force from an internal surface of a borehole.
A method for determining a rate of penetration of a downhole drilling operation, comprising:
- urging an element to extend from a working face at a rotational axis of a drill bit;
- measuring a rate of retraction of the element into the working face due to force from an internal surface of a borehole;
- measuring an azimuth and inclination of the drill bit during the measuring of the rate of retraction;
- and
- estimating a radius of curvature traveled by the drill bit based on the measured azimuth, inclination and rate of retraction.
A method for determining a rate of penetration of a downhole drilling operation, comprising:
- urging an element to extend from a working face of a drill bit, wherein the element is free to rotate relative to the working face of the drill bit;
- and
- measuring a rate of retraction of the element into the working face due to force from an internal surface of a borehole.
Dependencies are inferred from the claim text.