Unformatted text preview: n of mud.
60 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 30 D. Swabbing
Swab pressures are pressures created by pulling
the drill string form the borehole. The swab
pressure is a negative pressure and reduces the
effective hydrostatic pressure through the hole.
The variables controlling swab pressure are
(1) pipe pulling speed,
(2) mud properties,
(3) hole configuration,
(4) the effect of “balled” equipment.
61 E. Cut Mud
The mud cutting is usually that which is
obtained form the core volume cut by the
bit and released into the mud system, it
may expand and reduce the overall
hydrostatic pressure to a point sufficient to
allow a kick to occur.
62 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 31 F. Lost circulation
Kicks are occasionally caused by lost
circulation as a result of a decreased
hydrostatic pressure due to a shorter
column of mud. It is a recommended
practice to attempt to keep the hole
filled with water in order to monitor the
63 4. Warning Signs of Kicks
A. Introduction: There are a number of
warning signs and possible warning signs of
kicks that can be observed...
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- Fall '14
- Boyun Guo, Ali Ghalambor