Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1994-06-24
1995-10-03
Britts, Ramon S.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
175 48, 175 61, E21B 4700
Patent
active
054544360
ABSTRACT:
A method of warning of the onset of pipe sticking in a rotary drilling operation using a drill string comprising: (a) monitoring the pressure of a drilling fluid being pumped through the drill string during drilling over predetermined periods of time to obtain series of pressure measurements; (b) monitoring the torque required to rotate the drill string during said periods to obtain series of torque measurements; (c) obtaining the skew (third moment) of each series of pressure measurements according to the relationship ##EQU1## wherein N is the number of pressure measurements xi in the series, xmean is the average value of the measurements in the series, and .sigma. is the standard deviation of the measurements in the series; (d) obtaining the normalized standard deviation .sigma.n of the torque measurements in each corresponding series of torque measurements according to the relationship .sigma.n=(.sigma./ymean) wherein .sigma. is the standard deviation of the measurements in the series and ymean is the average value of the measurements in the series; and (e) comparing skew and .sigma.n for the series so as to identify corresponding changes in both and raising an alarm when the magnitude of said changes pass predetermined alarm values.
REFERENCES:
patent: 3740739 (1973-06-01), Griffin, III et al.
patent: 4298078 (1981-11-01), Lawrence
patent: 4423791 (1984-01-01), Moses, Jr.
patent: 4427080 (1984-01-01), Steiger
patent: 4428441 (1984-01-01), Dellinger
patent: 4685329 (1987-08-01), Burgess
patent: 4715451 (1987-12-01), Bseisu et al.
patent: 4791998 (1988-12-01), Hempkins et al.
patent: 4958125 (1990-09-01), Jardine et al.
Jardine Stuart I.
McCann Dominic P. J.
White David B.
Britts Ramon S.
Kanak Wayne I.
Schlumberger Technology Corporation
Tsay Frank S.
LandOfFree
Method of warning of pipe sticking during drilling operations does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of warning of pipe sticking during drilling operations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of warning of pipe sticking during drilling operations will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1072661