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Unformatted text preview: porosity
in abnormal pressured formations, the total saltwater content
of the rock will increase. The drilling fluid used to drill these
formations any increase in chloride content.
5. Shale Cuttings Characteristics: The shape of the drilled
cutting s observed at the shale shaker can be a pressure
indicator. When the hydrostatic pressure is much greater than
the formation pressure, it becomes increasingly more difficult to
remove the cuttings under the bit before they are reground into
small cuttings. So large cuttings at the surface indicate small
differential pressures. Fig.2 Generalized Shale Density Plot (Pg.5) Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 65 6. Supplemental References
• Shale Densities Key to Safer, Faster Drilling
Application of Drilling Performance Data to
Slide-Rule Correlation Aids ”d” Exponent Use
Field Verification of The Effect of Differential
Pressure on Drilling Rate
131 Section 5
Fracture Gradients 132 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 66 1. Land Operations
Fracture gradients are dependent upon
a number of variables. The most
important of these v...
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This document was uploaded on 03/28/2014.
- Fall '14