文档介绍：COST CONTROL
The object of any drilling operation
is to drill a usable well at minimum
cost
In most drilling operations, faster is
costfftit effective
Minimize non-drilling operations
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parisons
Cost per foot paring bit
runs, type of bits, downhole motors, bit
weight and rotary speed, hydraulics,
etc.
TtlTotal cost or t ttlotal cost per f oot wh en
comparing different types of muds,
casing programs, drilling practices,
etc.
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COST PER FOOT
Equation for calculating cost per foot
C + C ()t + T
C = Br
T F
Where CT is the cost per foot or
meter
CB is the cost of the bit
Cr is the hourly cost of the drilling
operations
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COST PER FOOT
Equation for calculating cost per foot
C + C (t +T )
C = B r
T F
T is the trip time in hours
t is the rotating time in hours
The nomenclature for equations is
at the end of each chapter
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COST PER FOOT
The hourly cost of the drilling
operations include
The daywork cost of the drilling rig
Rental equipment
Mud logger
Average mud maintenance cost
Work boats
HliHelicop ters
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COST PER FOOT
Directional drilling cost that ur
every day
Supervision
Standby personnel
Logg ing w hile dr illing
Anyygthing that is char ged b y the da y
or hour
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COST PER FOOT
The hourly rig cost does not include
one time charges or items that are
not time dependent
Casing
CtiCementing
Wireline open hole logs
Wellhead equipment
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COST PER FOOT
Example Problem 2-1 shows how to
calculate the cost per foot
Bit # 4
Rig cost = $2,000 per hour
Bit cost = $4,000
Rotating ti