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Introduction
List of Tables
List of Figures
List of Symbols Used in Equations
List of Symbols Used in Equations
List of Symbols Used in Equations
Symbol Definition Unit EQ #
A thermal expansion factor lb/gal/100°F 3
B hydrostatic compression factor lb/gal/1000 psi 4
BHPs safe bottomhole pressure psi or lb/in2 1, 4
BHT bottomhole temperature °F 3
C capacity bbl/ft 25, 29
C capacity of hole or pipe bbl/ft 26
Can capacity of annulus bbl/ft 16, 17, 28
Can capacity of annular space per linear foot bbl/ft 27
Can+t combined annular + tubing capacity bbl/ft 6
CF correction factor (lb/gal)/°F 10
CP averaged pressure correction lb/gal 4, 5
CT averaged temperature correction lb/gal 3, 5
Ct capacity of tubing bbl/ft 16, 17, 18, 21
d density of fluid in well lb/gal 19, 20
d1 density of starting fluid lb/gal 7
d1 density of fluid 1 lb/gal 9, 11, 14, 15
d2 density of added fluid lb/gal 7
d2 density of fluid 2 lb/gal 9, 11
dc density corrected for T and P lb/gal 5
dc fluid density, corrected to 60°F lb/gal 10
ddil final desired density lb/gal 15
ddil density of diluted fluid lb/gal 12
df density of final target fluid lb/gal 7
df density of final fluid lb/gal 9, 11, 14
dn density of fluid n in annulus lb/gal 30
dslug density of slug fluid lb/gal 20
du fluid density, uncorrected for T and P lb/gal 2
du uncorrected density from Equation 2 lb/gal 5
dw density of fresh water lb/gal 10
grad pressure gradient psi/ft 2
grads safe pressure gradient psi/ft 1
h total length of tubing ft 18
h length of hole or pipe ft 26
h length of annulus ft 28
hbal length of pill planned ft 16, 17, 18
hdry length of dry pipe ft 19
hn true vertical length of coverage of fluid n in annulus ft 30
HR hydrometer reading at sample temperature unitless 10
hslug length of slug fluid required ft 20, 21
ID inside diameter in 25
ID inside (casing, liner) diameter in 27
IDcasing casing ID in 6
IDt tubing ID in 6
l liter l 22, 23
lbproduct total product added to the recipe lb/bbl 13
lbpure weight of pure salt (100% basis) per barrel of original brine lb/bbl 12
lbpure weight of pure salt (100%) lb/bbl 13
lbpure weight of salt product per barrel required to weigh up to final fluid density lb/bbl 14
mg milligram mg 22, 23
OD outside (work string, tubing) diameter in 27
ODt tubing OD in 6
Pan hydrostatic pressure psi 30
pct1 percent of dissolved salt in fluid 1 wt fraction 15
pctdil percent of pure salt (100% basis) in diluted brine wt fraction 12
pctdil percent of dissolved salt in final fluid wt fraction 15
pctf percent of pure salt (100% basis) in original brine wt fraction 12
Pdif pressure differential psi 19, 20
ppm parts per million 10-6 22, 23, 24
psol solid content vol % 31
purity weight percent as decimal fraction unitless 13
Q flow rate bbl/min 29, 31
SG specific gravity unitless 22, 23
surf surface temperature °F 3
TVD true vertical depth ft 1
v1 volume of starting fluid bbl 7, 8
v1 volume of fluid 1 bbl 9, 11
v1 volume (as a fraction of a barrel) of fluid 1 bbl 15
v2 volume of added fluid bbl 7, 8
v2 volume of fluid 2 bbl 11
van total volume of annulus with pipe/tubing in well bbl 28
vchase volume of chase fluid bbl 18
Vel velocity ft/min 29
vf volume of final target fluid bbl 8
vf final volume bbl 14
vpill volume of balanced pill bbl 16, 17
vslug volume of slug bbl 21
vsol volume of solid removal rate ft3/min 31
vsurf volume of empty lines from pit to drill floor bbl 18
vtot total volume of hole or pipe bbl 26
wt % weight percent 10-2 24
ΔT sample temperature – 60°F °F 10
0.052 units conversion factor gal/in2-ft 2, 19, 20, 30
0.056 units conversion factor ft3/(bbl–%) 31
1029.4 units conversion factor in2-ft/bbl 6, 25, 27
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