PRODUCTIVITY INDEX
FOR
THE BEAM GAS COMPRESSOR
TERMINOLOGY
A.
BOTTOM HOLE PRESSURE
-
(BHP)
: The pressure in a well at a point opposite the
producing formation.
B.
STATIC BHP
: The pressure in a well at a point opposite the producing formation after the
well has been shut in and the pressure has stabilized.
C.
FLOWING BHP or PRODUCING BHP
: The pressure in a well at a point opposite the
producing formation during the wells production process.
D.
STATIC FLUID GRADIENT
: The pressure in PSI exerted by a column of fluid one-foot
high. The fluid gradient for calculating normal pressure below surface at any point is .465 PSI
per foot of fluid.
E.
STATIC FLUID LEVEL
: The height the STATIC BHP can push and support the fluid
column in a well that is shut in and the pressures have stabilized.
F.
FORMATION BACK PRESSURE
: The restricting pressure exerted on the face of the
formation by a column or fluid or surface pressure. Fluid column pressure (weight) and surface
pressure (flow line) will place unnecessary back Pressure on the formation and restrict the wells
ability to produce at its maximum production rate.
G.
DRAWDOWN
: The difference between the reservoir pressure and the pressure at the
bottom of the tubing (FLOWING BHP). If the PRODUCING BHP at the face of the formation
can be reduced, this reduction of pressure constitutes DRAWDOWN. This pressure drop
(DRAWDOWN) causes production flow into the well from the producing formation. The more
DRAWDOWN the more PRODUCTION.
H.
PRODUCTIVITY INDEX
(PI)
: The total number of barrels of liquid (oil & water) per day per
each PSI of DRAWDOWN.
The wells PI is the indicator of the wells ability to produce fluid.
EXAMPLE:
BOPD
= Barrels of oil per day
BWPD
= Barrels of water per day
SBHP
= Static Bottom Hole Pressure
FBHP
= Flowing or Producing Bottom Hole Pressure
This means - for this well, each PSI of DRAWDOWN or relief of FORMATION BACK
PRESSURE against the face of the formation, the well will produce an additional .5 (one half)
barrel of liquid per day.
If this well is producing against SURFACE BACK PRESSURE OF 30 PSI and this pressure was
relieved with the BEAM GAS COMPRESSOR - the results would be:
PI X DRAWDOWN = INCREASE IN PRODUCTION
.5 X 30 PSI = 15 BOPD INCREASE
TOTAL PRODUCTION RATE = SBHP - PRODUCING BHP (FBHP) x PI
OR
200 - 100 x .5 = 50 BOPD (PRESENT PRODUCTION)
Relieving the 30 PSI of BACK PRESSURE we reduced the FBHP
FBHP 100 PSI - 30 PSI SURFACE PRESSURE = 70 PSI FBHP
200 PSI - 70 PSI x .5 = 65 BOPD (15 BOPD +)
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