Method for improving drilling depth measurements

Details Method for improving drilling depth measurements Method for improving drilling depth measurements

2007-12-11

2007-12-11

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

C175S027000, C702S009000

Reexamination Certificate

active

11429650

ABSTRACT:
A method for determining a depth of a wellbore includes determining change in a suspended weight of a drill string from a first time to a second time. A change in axial position of the upper portion of the drill string is then determined between the first time and the second time. An expected amount of drill string compression related to the change in suspended weight for movement of a lower portion of the drill string between the first time and the second time is corrected. A position of the lower portion of the drill string is calculated from the change in axial position and the corrected amount of drill string compression.

REFERENCES:
patent: 6405136 (2002-06-01), Li et al.

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