Pump and Fluid Systems
Chapter 3: Operations
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25
MP-16 2-Piece 5000 psi January 2013
3.3.4
Rapid Piston & Liner Wear
In most cases, faster than
normal wear of the pistons and/or
liners is the result of either problems
with the coolant or the mud. First,
make sure the pistons being used
are appropriate for the type of mud
being run. Then check that the
coolant is at a normal operating
temperature (100°F or less), and is
not contaminated with trash or mud.
Then double check the spray
manifold nozzles and holes drilled in
the coolant rods to ensure that they
are spraying sufficient coolant into
the liner. Remove any plugs or
restrictions on the coolant flow.
Drilling fluid that contains a high
concentration of sand or other
solids will rapidly degrade pump
components, usually evidenced by
streaks in the liner bores. In such
cases, the mud tanks should be
cleaned, and the de-sanders should
be checked and replaced as
needed.
If the drilling fluid has a pH
above 8.5, then it is considered
corrosive, and will cause excessive
damage to normal liners. If the mud
contains hydrogen sulfide, or if oil-
based and the aniline point of the oil
is less than 150°F, then it will attack
and rapidly deteriorate the piston
cups and valve discs. In all such
cases,
premium
or
specialty
components should be used to
reduce deterioration.
If none of these solutions help,
contact a Weatherford professional.