Page 225 - Petroleum Production Engineering, A Computer-Assisted Approach

Guo, Boyun / Computer Assited Petroleum Production Engg 0750682701_chap14 Final Proof page 221 3.1.2007 9:10pm Compositor Name: SJoearun

OTHER ARTIFICIAL LIFT METHODS 14/221
Power p 2 ¼ discharge pressure, psia
fluid q 2 ¼ q 1 þ q 3 , total fluid rate in return column, bbl/day
p 3 ¼ intake pressure, psia
Pump q 3 ¼ intake (produced) fluid rate, bbl/day
tubing A j ¼ jet nozzle area, in. 2
A s ¼ net throat area, in. 2
Casing
2
A t ¼ total throat area, in. .
Nozzle
The following dimensionless variables are also used in
Production jet pump literature (Cholet, 2000):
inlet chamber
Throat A j
R ¼ (14:32)
Diffuser A t
q 3
M ¼ (14:33)
q 1
p 2 p 3
H ¼ (14:34)
p 1 p 2
h ¼ MH, (14:35)
Combined
fluid return where
R ¼ dimensionless nozzle area
M ¼ dimensionless flow rate
H ¼ dimensionless head
h ¼ pump efficiency.
Well
production
14.6.3 Selection of Jet Pumps
Selection of jet pumps is made on the basis of manufacturer’s
literatures where pump performance charts are usually avail-
able. Figure 14.12 presents an example chart. It shows the
Figure 14.10 Sketch of a hydraulic jet pump installation. effect of M on H and h. For a given jet pump specified by R
value, there exists a peak efficiency h p . It is good field practice
Some of the kinetic energy of the mixed stream is con-
verted to static pressure head in a carefully shaped diffuser to attempt to operate the pump at its peak efficiency. If M p
section of expanding area. If the static pressure head is and H p are used to denote M and H at the peak efficiency,
greater than the static column head in the annulus, the respectively, pump parameters should be designed using
fluid mixture in the annulus is lifted to the surface. q 3
M p ¼ (14:36)
q 1
14.6.2 Technical Parameters and
The nomenclatures in Fig. 14.11 are defined as
p 2 p 3
p 1 ¼ power fluid pressure, psia H p ¼ , (14:37)
q 1 ¼ power fluid rate, bbl/day p 1 p 2
A j A s A t

P q 3
3

P q 1 P q 2
2
1
Nozzle Throat Diffuser

A B
Figure 14.11 Working principle of a hydraulic jet pump.