American Oil and Gas Reporter - June 2016 - 70

SpecialReport: Artificial Lift Technology
FIGURE 2

is that it limits the maximum drawdown
to the depth of the top of the inverted
shroud.

Artificial Lift Production History
10,000

ESP SYSTEM

GAS LIFT

ESP SYSTEM

1,000

100

10

Oil (bbl/d)

Gas (Mcf/d)

been employed in unconventional oil
wells. The natural separation efficiency
of a tangent sump can be even more efficient than a vertical sump. Having the
wellbore at an angle promotes natural
separation because the gas tends to gather
and flow in the ceiling of the casing, allowing the liquid to flow on the floor of
the casing. However, the major disadvantage is the added cost and complexity

70 THE AMERICAN OIL & GAS REPORTER

ay
-2
01
3
3M

3Ap
r-2
01
3

ar
-2
01
3
3M

3Fe
b20
13

3Ja
n20
13

-2
01
2
3D
ec

3N
ov
-2
01
2

-2
01
2
3O
ct

3Se
p20
12

3Au
g20
12

3Ju
l-2
01
2

1

Water (bbl/d)

of constructing the sump.
Inverted shrouds also have proven effective. The traditional inverted shroud
design features a hollow bottom that
allows the motor to extend out of the
bottom of the shroud to allow direct fluid
contact for cooling. The benefits of the
inverted shroud are that it provides a gasavoiding, slug-resistant system without
drilling a fixed sump. The disadvantage

Artificial Sump ESP System
Similar to an inverted shroud, artificial
sumps provide the gas managing benefits
of a wellbore sump without added drilling
and completion costs. The artificial sump
pumping (ASP) system deployed in the
Mississippian Lime case study well provides a fully enclosed ESP, complete
with a forced cooling system and debris
trap (Figure 1). In effect, the ASP is an
"ESP in a can" with a recirculation system
for motor cooling.
The shroud extends from below the
ESP to a level above the pump. The
length of the shroud varies, depending
on the desired flow rate and expected
slug duration. The typical length is 200300 feet, but there is potential for shroud
length to extend beyond 500 feet. One
consideration for determining shroud
length is that the only inlet is located at
the top of the shroud, making the top of
the shroud the equivalent pump intake



American Oil and Gas Reporter - June 2016

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American Oil and Gas Reporter - June 2016 - Cover1
American Oil and Gas Reporter - June 2016 - Cover2
American Oil and Gas Reporter - June 2016 - Contents
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