Drillpipe eccentricity effect on drilled cuttings behavior in vertical wellbores

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/9701-PA· OSTI ID:5949576

Thomas, R P; Azar, J J; Becker, T E

Effects of drillpipe eccentricity and rotation of the eccentric drillpipe on the carrying capacity of drilling muds in a vertical wellbore have been observed on a simulated wellbore test apparatus under steady-state conditions at laminar fluid flow. The applicability of the semiempirical cuttings transport model developed by Zeidler to the experimental conditions also was tested. Experimental parameters included two velocity values 30.48 and 45.72 cm/s, four eccentric positions, and four rotary speeds, with a transparent simulated drilling fluid whose rheological properties were kept constant. Results show that drillpipe eccentricity has a minor influence on annular cuttings volumetric concentration and that the effect appears to be oscillatory in nature. Although increasing rotary speed generally improves particle transport, it is more pronounced at lower annular fluid velocities and appears to be negligible at high velocities. Also, there is a threshold value of rotary speed above which there is little change in transport behavior.

• OSTI ID: 5949576
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 34:9; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BOREHOLES
CAVITIES
DRILL PIPES
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUID FLOW
FLUIDS
MOTION
PIPES
RHEOLOGY
ROTATION
SIMULATION