Annulus Pressure While Drilling (APWD)

  


Specifications
            Module Diameter
              :
          

            1.875″
          

            Module Length
              :
          

            34.9″ (88 cm)
          

            End Connections
              :
          

            175°C (347°F)
          

            Max Pressure
              :
          

            20,000 psi
          

            Transducer Rating
              :
          

            15,000 to 29,000 psi
          

            Accuracy % Full Scale
              :
          

            0.1%
          

            Repeatability
              :
          

            1 psi
          

            Sub Sizes OD
              :
          

            4.75–9.5″
          
DescriptionThe APWD is a fully calibrated and temperature-compensated instrument that provides measurements while drilling. The sensors are also equipped to perform Formation Integrity Tests (FIT) and provide pressure measurements while the pumps are off. The tool is fully programmable, allowing custom adjustment of sampling times and measurement start times. All measurements are logged to memory and can be sent up hole for real-time analysis.
 
Features & BenefitsReal-Time Measurements of Annular Pressure.
Memory Recordable Measurements.
Fully Retrievable.
Early Lost Circulation Detection.
Early Detection of Well Blowouts.
 
Sensor MeasurementsThe APWD can be run along with the MWD system in an NMDC in a wide range of collar sizes (from 4.75 in to 9.5 in) and can provide the following measurements in several flexible configurations:
Eight real-time variables (limit on Legacy tools). 14 total data points including:
Average Annulus Pressure
Internal Pipe Pressure
Peak Pressure
Peak Z Vibration (raw)
Resting Pressure
Peak X-Y Vibration (raw)
Z Vibration Flag
Annular Temperature
X-Y Vibration Flag
Z Vibration (raw)
Z Shock Flag
X-Y Vibration (raw)
X-Y Shock Flag
Z Shock (Counts)
Gain/Loss While Pump Off
 
ApplicationsKeeping the ECD inside a narrow operating margin.
Detect and manage hole cleaning.
Early shallow water flow detection.
Underbalance Drilling.
Kicks and Influx detection.
Barite Sag monitoring.
Accurate leak-off and formation integrity tests.
Discriminate influx or weeping.
 
CalibrationPressure sensor and board are “burned in”.
Calibrated over 7 pressures and 8 temperatures.
Tools are temperature and pressure calibrated.
Dead weight gives pressure accuracy under 1 psi.
Two calibrated temp sensors are placed on the circuit board and transducer.
Circuit boards and pressure transducers are calibrated together as a pair.
 