Measuring and testing – Borehole or drilling – Downhole test
Patent
1990-03-30
1992-04-28
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
358139, 364562, F21B 4500
Patent
active
051077051
ABSTRACT:
Video systems and methods for determining the length of objects to be inserted in a wellbore, and for summing the lengths to obtain an accurate determination of the depth at which a bottomhole assembly is located at any given time. The video systems and methods of the present invention are also used in conjunction with hookload and traveling block location information to determine bottomhole assembly depth while drilling, or tripping-in or tripping out of a well. Also disclosed is a method of accurately determining the transition a drillstring undergoes and its associated movement when passing from in-slips to out-of-slips.
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Mayes James C.
Orban Jacques
Wraight Peter
Miller Craig
Ryberg John J.
Schlumberger Technology Corporation
Williams Hezron E.
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