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US 9,850,708 B2Granted
Drill string sub
AssigneeTesco Corporation
InventorRyan Thomas Bowley
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to a drilling system including a drill string with two or more drill pipes (e.g., tubular), a drive system configured to rotate the drill string, and a neutral point sub disposed proximate a neutral point of the drill string, where the neutral point sub is configured to detect motion of the drill string.
Claims19
A drilling system, comprising:
- a drill string comprising two or more drill pipes;
- a drive system configured to rotate the drill string about a longitudinal axis extending through the drill string;
- a neutral point sub disposed proximate a neutral point of the drill string, wherein the neutral point sub is configured to detect rotation of the drill string proximate the neutral point sub;
- and
- a controller configured to control rotation of the drill string based on feedback transmitted to the controller from the neutral point sub,
- wherein the neutral point is positioned on the drill string such that the rotation of the drill string is detected by the neutral point sub and corrected for by the controller without an alteration of a drilling angle.
3 more elements
A method of controlling rotation of a drill string, the method comprising:
- detecting rotation of the drill string at a neutral point of the drill string in a first circumferential direction via a neutral point sub disposed on the drill string;
- instructing a drive system, via a controller, to stop rotating the drill string in the first circumferential direction after detecting the rotation of the drill string at the neutral point;
- and
- instructing the drive system, via the controller, to start rotating the drill string in a second circumferential direction opposite to the first circumferential direction after stopping the rotation in the first circumferential direction, wherein the neutral point is positioned on the drill string such that the rotation of the drill string is detected by the neutral point sub and corrected for by the controller without an alteration of a drilling angle.
1 more element
A method of drilling a well, the method comprising:
- instructing a top drive, via a controller, to apply torque to a drill string in a first
- circumferential direction relative to a longitudinal axis extending through the drills string;
- detecting rotation of the drill string at a neutral point of the drill string below the top drive via a neutral point sub;
- sending a pulse, via the neutral point sub, to the controller to alert the controller that the neutral point sub has detected rotation of the drill string at the neutral point;
- processing the pulse via the controller;
- and
- instructing the top drive, via the controller, to apply torque to the drill string in a second circumferential direction relative to the longitudinal axis, wherein the second circumferential direction is substantially opposite the first circumferential direction, wherein the neutral point is positioned on the drill string such that the rotation of the drill string is detected by the neutral point sub and corrected for by the controller without an alteration of a drilling angle.
4 more elements
Dependencies are inferred from the claim text.