Methods and systems for drilling
AssigneeShell Oil Company
InventorsDavid Alston Edbury, Jose Victor Guerrero, Duncan Charles MacDonald, James Bryon Rogers, Donald Ray Sitton
Life of this patent
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Abstract
A method of controlling a direction of a toolface of a bottom hole assembly for slide drilling, comprises a) synchronizing the toolface wherein synchronizing the toolface comprises determining a relationship between the rotational position of the down hole toolface with a rotational position at the surface of the formation for at least one point in time, b) stopping rotation of the drill string coupled to the bottom hole assembly, c) controlling torque at the surface of the drill string to control a rotational position of the toolface, and d) commencing a slide of the drill string.
Claims9
A method of controlling a direction of a toolface of a bottom hole assembly for slide drilling, comprising:
- a) synchronizing the toolface wherein synchronizing the toolface comprises determining a relationship between the rotational position of the down hole toolface with a rotational position at the surface of the formation for at least one point in time;
- b) stopping rotation of the drill string coupled to the bottom hole assembly;
- c) controlling torque at the surface of the drill string to control a rotational position of the toolface;
- and
- d) commencing a slide of the drill string,
- further comprising unwinding the drill string during or after the synchronization.
A method of controlling a direction of a toolface of a bottom hole assembly for slide drilling, comprising:
- a) synchronizing the toolface wherein synchronizing the toolface comprises determining a relationship between the rotational position of the down hole toolface with a rotational position at the surface of the formation for at least one point in time;
- b) stopping rotation of the drill string coupled to the bottom hole assembly;
- c) controlling torque at the surface of the drill string to control a rotational position of the toolface;
- and
- d) commencing a slide of the drill string,
- further comprising unwinding the drill string during or after the synchronization based on a torque and drag string windup model.
Dependencies are inferred from the claim text.