A New Downhole Tool for ECD Reduction

fax 01-972-952-9435. AbstractAs the oil and gas industry moves toward drilling ultra-deep and deepwater wells with small margins between pore pressure and fracture gradient, management of ECD becomes a key factor in the successful drilling of these wells. ECD is governed by the hydrostatic head of the mud column and frictional pressure loss in the annulus, and therefore is influenced by many factors such as well and drillstring geometry, drilling fluid rheology and flow rates. Many theoretical and experimental studies have dealt with the flow of fluids through pipes and annuli for friction pressure loss calculations. However, the effect of tool joints in estimating pressure losses in annuli in many cases is underestimated or ignored. Although a single tool joint is short and does not increase the frictional loss drastically, the overall contribution to the increase in ECD by all the tool joints in the wellbore can be significant. Therefore, there is a strong need to investigate the effects of tool joints on ECD control. This paper presents results for a theoretical study conducted through Computational Fluid Dynamics techniques to evaluate the influence of the tool joints on ECD for different wellbore geometries, drilling fluids and flow rates. It is found that the effect of the tool joint on the annular friction pressure loss is significant and should be taken into account in the optimal hydraulic program considerations.

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The Effect of Tool Joints on ECD While Drilling

Simoes

Miska

Takach

et al. 2007

Production and Operations Symposium

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A New Downhole Tool for ECD Reduction

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The Effect of Tool Joints on ECD While Drilling

The Effect of Tool Joints on ECD While Drilling

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