Multisensor

Operators can use a down hole sensor to obtain a direct measurement of ESP and well performance.
Direct, accurate measurements are of more value than a simulated or calculated value.
Real Time measurements provide the tool to perform in depth data validation & analysis.  

For real results in production optimization take  a look at overall  well performance – not just the lifting mechanism.

The Multisensor measures:

• Intake Pressure
• Discharge Pressure (optional)
• Intake temperature
• Motor temperature
• ESP Vibration
• Cable Insulation

The monitoring system has three main sections :

1. Multisensor Downhole Tool

2. Integrated Surface Panel

3. Multisensor Choke Console

The Multisensor is connected to the wye point of the motor and is  fitted  to the bottom of the ESP Motor.

The Integrated Surface Panel provides:

• The power for the Multisensor
• Signal decoding for the Multisensor
• Data display and storage
• ESP protection though Alarm and Trip functions

The choke provides high voltage isolation between the high voltage of the ESP system and the ISP The Choke can be supplied either with or without an enclosure

The MultiSensor downhole system measures up to 5 parameters, these being Pi, Pd, Ti, Tm and vibration. 

Downhole sensors are calibrated to international standards.

Data is transmitted via the motor power cable to the surface.

The downhole electronics are Qualified for their operation in this environment.

Measurement: Sensors : 

Intake Pressure : Measured using a 400 Bar sealed strain gauge pressure transducer.  

The voltage output from the transducer is near linear with pressure. 

Discharge Pressure : Measured in the same way as intake pressure but with a ¼ inch sealed control line extending to above the pump discharge.

Intake Temperature : This is measured by utilizing the semi-conductor temperature sensor which is both linear and accurate in temperature measurement. The voltage output varies with temperature. 

The temperature sensor is calibrated in an oven.

Motor Temperature : Either motor winding with a thermocouple fitted in the motor winding, or motor oil with the thermocouple fitted into the oil at base of the motor. Measured using J-type thermocouples and works by means of a temperature difference system. For absolute temperature the Intake temperature is used as the reference. The temperature sensor is calibrated in an oven.

 Vibration : Measured by means of a calibrated accelerometer fitted inside the MultiSensor. 

Current Leakage : The MultiSensor system measures leakage to earth through the ESP system and also when the MultiSensor is isolated from the rest of the system. This is referred to as active and passive current leakage


What Can We Do With This Data…..?

• Monitoring
• Trending
• Protection
• Validation & Analysis
• Use the analysis results for optimisation 

Pressure Protection :

Intake Pressure :

• Low trip:- Protect Against Pump Off
• Low Fluid Level
• Gas Breakout

Discharge Pressure :

• High trip:- Protect Against Shut In
• Closed Valves
• Heavy Fluid Slugs

Delta Pressure :

• Low / High trip:- Upthrust/Downthrust
• High Flow conditions
• Low Flow Conditions

Temperature Protection :

Intake Temperature :

• High trip:- Protect Excessive Intake Temp
• Recirculation

Motor Winding Temperature :

• High trip:- Protect Excessive Motor temp
• Low Flow
• High Load
• Anything that will cause the Motor to Heat

Vibration and Current Leakage :

Vibration :

• High Alarm:-ESP mechanical damage
• High solids  production
• Warning of Mechanical wear
• Resonance ‘frequency fine tuning’

Current Leakage :

• High Alarm:-Electrical system deterioration
• High Pump Heat (MLE)
• Resistance Breakdown
• Phase to ground warning

Using the Analysis to Optimize Production :

• Model the whole hydraulic system

• Use Phoenix data to validate important  parameters :

1. Water cut & GOR
2. Flowing Bottom Hole pressure
3. Pump Operating point (down hole flow)
4. Reservoir pressure
5.  Accurate Productivity Index

• Use the results to predict improved optimisation :

1. Better runlife 
2. More net oil