MPMS Chapter 12 part 2
Calculation of Petroleum Quantities
Measurement Tickets
Introduction
The application of this standard to the calculation of metered quantities
is presented for base volumetric calculations in conformance with
North American industry practices.
•
•
•
•
Recording of field data
Rules for rounding
Discrimination levels (how can the value of an instrument be read)
Calculation sequences
The examples
Th
l can be
b used
d to
t aid
id iin checkout
h k t
procedures for any computer calculation routines that
are developed on the basis of the requirements stated in this
standard.
Field of Application
This standard applies to liquids that are considered to be:
• Clean
• Single-phase
• Homogeneous
H
• Newtonian at metering conditions
Most liquids associated with the petroleum and petrochemical
industries are usually considered to be Newtonian
Newtonian.
The application of this standard is limited to liquids that utilize
implementation procedures to correct
metered volumes at flowing temperatures and pressures to
corresponding volumes at base conditions.
To accomplish this
this, the density of a liquid shall be determined by the
appropriate technical standards.
Correction Factors (1/2)
Calculations
C
l l ti
are b
based
d on correcting
ti th
the
measured volume of the merchantable liquid to
its volume at base conditions
conditions.
Correction
C
ti ffactors
t
are provided
id d tto:
• Adjust the metered volume to base conditions
• Adjust for inaccuracies associated with the
meter’s performance
• Combine factors for ease of calculations
• Adjust for nonmerchantable quantities.
Correction Factors (2/2)
•
•
•
•
Liquid density correction factors
Meter factors
Combined correction factors
Correction for sediment and water
Recording of field data
• Determine the base density
(From laboratory or by calculation from observed density
and observed temperature measurement)
• Determine CTL (temperature correction)
• Determine F (compressibility correction)
• Determine CPL (compressibility correction)
• Determine CCF (combined correction)
• Determine
ee
e IV ((Indicated
d ca ed Volume)
o u e)
• Determine GSV (Gross Standard Volume)
• Determine CSW (Correction for Sediment & Water)
• Determine NSV (Net Standard Volume)
• Determine SWV (SWV = GSV – NSV)
Measurement ticket data (1/2)
Liquid Data:
q
type
yp
• Liquid
• Observed density
• Observed
temperature
• Pressure
• Sediment and Water
Meter Data:
• Closing
g meter reading
g
• Opening meter reading
• Meter factor
• Weighted average
temperature
• Weighted average
pressure
Measurement ticket data (2/2)
Calculation
C
l l ti d
data:
t
• Base density
• CTL
Temperature correction factor
• F
Compressibility factor
• CPL
Pressure correction factor
• CCF
Combined correction factor
• IV
Indicated Volume
• GSV
Gross Standard Volume
• CSW
Correction for Sediment and Water
• NSV
Net Standard Volume
• SWV
Sediment and Water Volume
Sirte measurement tickets (1/3)
Sirte measurement tickets (2/3)
Sirte measurement tickets (3/3)