Method of monitoring the drilling of a borehole

Details Method of monitoring the drilling of a borehole Method of monitoring the drilling of a borehole

1990-07-02

1992-08-18

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

73579, 73659, 73660, 175 39, 175 40, E21B 4700

Patent

active

051388758

ABSTRACT:
The invention relates to a method of monitoring the drilling of a borehole through an earth formation with a rotating drill bit fixed at the lower end of a drillstring. At least one physical quantity associated with the vibrations resulting from the interaction of the rotating drill bit with the earth formation is detected and an oscillatory signal is generated in response thereto. Filter coefficients a.sub.k of an auto-regressive filter model are determined by fitting the filter output signal with the oscillatory signal. The reflection coefficients of the vibrations propagating along the drill string and being reflected by a mis-match of impedance of two successive elements of the system earth formation/drillstring are derived from the filter coefficients. Finally, the hardness of the formation being drilled, the contact of the drillstring with the borehole and the vibration level of the vibration along the drillstring are determined from the reflection coefficients.

REFERENCES:
patent: Re28436 (1975-06-01), Vitter et al.
patent: 3520375 (1970-07-01), Raynal et al.
patent: 3626482 (1971-12-01), Quichaud et al.
patent: 3714822 (1973-02-01), Lutz
patent: 4150568 (1979-04-01), Berger et al.
patent: 4773263 (1988-09-01), Lesage et al.
patent: 4928521 (1990-05-01), Jardine

Affiliated with

Also associated with

Rating

Method of monitoring the drilling of a borehole 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 monitoring the drilling of a borehole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of monitoring the drilling of a borehole will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1240307