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Down hole
sensors are used to monitor
and log critical down hole
parameters used for reservoir
management and ESP monitoring
and control.
Sensors may
be attached to common brands
of ESP motors if an upper
tandem or centre tandem motor
is employed. Data is transmitted
to the surface with a digital
signal that travels along
the main ESP power cable.
A surface choke is used to
isolate the motor voltage
before the signal is interpreted
by the surface interface panel.
A data logger
or an ESP motor controller,
serially connected to the
surface interface panel, performs
the data logging function.
The controller can also perform
control or alarm shutdown
functions based on set points
against down hole data.
Recent advances
in down hole sensor technology
have resulted in reliable
and lower cost sensors for
use with ESP’s. There
are two key advantages to
operating a system with a
down hole sensor:
1. Sensors
provide additional protection
for an ESP system, particularly
against motor overheating,
a common source of failure
and reduced run life.
2. Valuable data can be gained
from the reservoir, optimizing
production and minimizing
service costs.
There are a number of different
sensor models on the market.
Typical parameters currently
capable of being measured
are:
- Well Bore
Pressure
- Well Bore
Temperature
- Motor Winding
Temperature
Some models
are capable of measuring more
advanced parameters, including:
- Discharge
Pressure
- Insulation
Resistance
- 2-Plane
Motor Vibration
COSCO is a leader in this
technology and can provide
several sensor options to
meet any production requirement:
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