Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Patent
1995-04-10
1998-12-15
McElheny, Jr., Donald E.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
702 12, G06F 1900
Patent
active
058506217
ABSTRACT:
The method according to the invention permits adapting for any fluid, a known model representative of the circulation of a fluid in an annular space around a motionless pipe, centered or eccentric uniformly over the total length thereof, to more complex cases which are encountered in practice and notably in drilling. The invention comprises the application, to the pressure loss values obtained with the known model, of a first correction factor accounting for the eccentricity variations which the pipe may undergo notably because of the variations in the axial load applied or of straightness defects of the conduit, and of a second correction factor representative of the effects due to the rotation of the pipe. The method identifies the prominent pressure loss variations which are observed in narrow annular spaces. The method can be applied to narrow hole petroleum drilling (of the slim hole type).
REFERENCES:
patent: 4726219 (1988-02-01), Pearson et al.
patent: 4821564 (1989-04-01), Pearson et al.
SPE Publications, 21 Mar., 1993, Oklahoma pp. 469-482, T.D. Reed & A.A. Pilehvari "A New Model for Laminar, Transitional, and Turbulent Flow of Drilling Muds".
Cartalos Ulysse
Haciislamoglu Mustafa
Institute Francais du Petrole
McElheny Jr. Donald E.
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