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A Review Of The Rheological Effects Of Power Law Drilling Fluids On Cuttings Transportation In Non-vertical Boreholes
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For turbulent flow in horizontal wells, the concept of using annular
velocity (AV) as a measure of hole cleaning is insufficient. A more
complete term called AVRD is introduced, which is the product of the AV
and the square root of the hydraulic diameter. This term can be used to
compare cuttings transport in turbulent flow in horizontal wells of
different cross sectional areas. (Leising et al., 1998).
Rheology
which is the study of the flow and deformation of fluids is an important
contributing factor to these problems. Rheology describes the
relationships between shear rate and shear stress. Pilehvari, Azar, and
Sanchez2,16 state that fluid velocities should be maximized to achieve
turbulent flow, and mud rheology should be optimized to enhance
turbulence in inclined/horizontal sections of the well bore.
The
purpose of this study is to investigate how rheological parameters
influence the removal of cuttings in non-vertical boreholes.
1.2 Objectives
The objectives of this research are:
· To present a review of cuttings transport in vertical, directional/horizontal well bores.
· To provide a critical review of how rheology affects cuttings transportation in non-vertical boreholes.
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To identify the critical parameters that affect effective removal of
cuttings in the drilling of non-vertical boreholes.
· To
propose a methodology for analysing the rheological parameters that
affect cuttings transportation in non-vertical boreholes.
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ABSRACT - [ Total Page(s): 1 ]Cuttings transportation during in non-vertical boreholes is necessary for oil and gas wells. Adequate cuttings removal from a well in drilling is critical for cost-effective drilling as high annular cuttings buildup often leads to high risk of stuck pipe, reduced rate of penetration and other impediments to standard drilling and completion procedures.This study investigates how rheological parameters influence the removal of cuttings in non-vertical boreholes. It contributes to work already done ... Continue reading---
