MWD Sensors
MWD Sensors
Directional Drilling

Applied Physics Systems provides wide variety of high performance directional, logging, and gamma sensors designed for oil and gas exploration in challenging environments. Our sensors are used in directional drilling, borehole logging, EM and pulse based MWD systems, and in high temperature drilling applications for oil, gas, and geothermal. Our sensors feature rugged construction, high reliability, and high accuracy. Our sensors support two communication protocols for wide range of information from downhole to the surface, including roll, inclination, azimuth, vibration, shock, and rotational data.

  • Products
  • FAQs
High accuracy directional sensors
  • Model 750 - High Accuracy Orientation Sensor Data Sheet(pdf)
    Features
    • Small size: 1.25” OD and 16.6” length
    • High accuracy: ±0.1° for inclination and ±0.3° for azimuth
    • Digital serial input/output
    • Accurate inclination while drilling
    Applications
    • EM and Pulse-based MWD systems
    • Orientation of borehole logging instruments
    • Directional drilling
  • Model 750HT - High Temperature Directional Sensor Data Sheet(pdf)
    Features
    • High operational temperature to 175°C
    • High accuracy: ±0.1° for toolface (roll) and inclination, ±0.3° for azimuth
    • Digital serial input/output
    • Accurate inclination while drilling
    Applications
    • EM and Pulse-based MWD systems
    • High-temperature drilling applications for oil, gas, and geothermal
  • Model 850HT - High Temperature, Small Diameter Directional Sensor Data Sheet(pdf)
    Features
    • High operational temperature to 175°C
    • High accuracy: ±0.1° for toolface (roll) and inclination, ±0.3° for azimuth
    • Digital serial input/output
    • Smallest diameter MWD sensor in the world (1.040” OD x 12.3” long)
    • Accurate Inclination while drilling
    Applications
    • EM and Pulse-based MWD systems
    • High-temperature drilling applications for oil, gas, and geothermal
  • Model 1150 - High Accuracy Directional Sensor Data Sheet(pdf)
    Features
    • High accuracy: ±0.1º for toolface (roll) and inclination, ±0.3º for azimuth
    • Digital serial input/output
    • Small size: 1.360” OD by 29.2” long
    • Temperature compensated to 150°C
    Applications
    • Tensor digital drop-in replacement
    • Orientation of borehole logging instruments
    • Directional drilling
  • Model 1150 Advanced - High Accuracy Directional Sensor Data Sheet(pdf)
    Features
    • High accuracy: ±0.1º for toolface (roll) and inclination, ±0.3º for azimuth
    • Digital serial input/output
    • Real-time vibration monitoring
    • Accurate “Inclination-while-drilling” data
    • Real-time rotation monitoring with accurate RPM reporting to 200 RPM
    • Optional integrated axial shock mounts
    Applications
    • Advanced drop-in replacement for GE Tensor Digital Orientation Module
    • Orientation of borehole logging instruments
    • Directional drilling
  • Model 1160 - Advanced High Temperature Directional Sensor Data Sheet(pdf)
    Features
    • Operational temperature to 175°C
    • High accuracy: ±0.1º for toolface (roll) and inclination, ±0.3º for azimuth
    • Digital serial input/output
    • Real-time vibration monitoring
    • Accurate “Inclination-while-drilling”
    • Real-time rotation monitoring with accurate RPM reporting to 200 RPM
    • Optional integrated axial shock mounts
    Applications
    • Replacement directional module for legacy MWD systems
    • High-temperature drilling applications for oil, gas, and geothermal
  • Model 175 - Wireline Steering Tool System Data Sheet(pdf)
    Features
    • High Accuracy: ±0.1º for inclination and toolface, ±0.3º for azimuth
    • LCD readout continually displays azimuth, inclination, toolface
    • Steers in any orientation
    • Simple set up and operation - lightweight and compact
    • Reliable data transmission with continuous error checking and error display
    • Models available for operation to 150ºC
    Applications
    • Horizontal Directional Drilling
    • Short radius directional drilling
    • Borehole logging and re-entry drilling
Logging Sensors
  • Model 547 - Micro Orientation Sensor Data Sheet(pdf)
    Features
    • Small size: 1.0” OD x 10.5” length
    • High accuracy: ±0.4° for inclination
    • Digital serial input/output
    • Internally stored calibration data
    • Direct angular output
    Applications
    • Directional drilling steering tools
    • Short radius drilling steering tools
    • Orientation of borehole logging instruments
    • Towed sonar arrays
  • Model 544 - Miniature Orientation Sensor Data Sheet(pdf)
    Features
    • High accuracy
    • Operational temperature to 70°C (Model 544) or 125°C (Model 544H)
    • Calculates and outputs roll, pitch, azimuth data
    • Small size: Fits inside a 1” pipe (ID)
    • Digital serial input/output
    Applications
    • Borehole logging
    • Directional drilling
    • Orientation determination for buoys, sonar systems
    • Magnetic compass
Gamma Sensors
  • Model 751 - Natural Gamma Sensor Data Sheet(pdf)
    Features
    • Digital interface
    • High sensitivity crystal - Photomultiplier tube design
    • Rugged design for use in high shock and vibration environments
    • Axial and transverse 50 G accelerometers for vibration monitoring
    Applications
    • Evaluation of downhole strata in drilling and logging applications
    • Evaluation of downhole vibration and shock magnitudes
  • Model 851 - Narrow Diameter Natural Gamma Sensor Data Sheet(pdf)
    Features
    • Digital interface
    • High sensitivity crystal - Photomultiplier tube design
    • Rugged design for use in high shock and vibration environments
    • Axial and transverse 50 G accelerometers for vibration monitoring
    Applications
    • Evaluation of downhole strata in drilling and logging applications
    • Evaluation of downhole vibration and shock magnitudes
  • Model 1151 - Natural Gamma Vibration Sensor Data Sheet(pdf)
    Features
    • Digital Interface
    • High Sensitivity Crystal
    • Photomultiplier Tube Design
    • Two Gamma Outputs: API calibrated count pulse output, Q-Bus Output via GV0 (General Variable Zero)
    • Extensive Vibration Statistics output
    • Available via GV0 – 7
    Applications
    • Evaluate downhole strata when drilling and logging
    • Evaluate downhole vibration and shock magnitudes
    • Function in high shock and vibration environments
    • Laboratory measurements
    • Materials testing
Focused Gamma Sensors
  • Model 751F - Focused Natural Gamma Sensor Data Sheet(pdf)
    Features
    • Operational temperature to 150°C
    • Digital interface
    • High sensitivity crystal with Photomultiplier tube design
    • Rugged design for use in high shock and vibration environments
    • Axial and transverse 50 Gee accelerometers for vibration monitoring
    Applications
    • Geo-Steering in narrow/thin zones
    • Evaluation of downhole strata in drilling and logging applications
    • Evaluation of downhole vibration and shock magnitudes
Are Applied Physics Systems directional sensors and gamma sensors "paired"?

No. Our Directional and Gamma Sensors are interchangeable. The standard connection from our Model 750 Directional Sensor to the Model 751 Gamma Sensor is through our NET bus system. In this system, the Directional Sensor controls and connects to devices on the bus and manages their communication with the host system.

How accurate are Applied Physics Systems directional sensors?

Our Directional Sensors are ±0.1° for inclination and toolface and ±0.4° for azimuth. Product specifications are listed on all our data sheets.

How do I access the data from an Applied Physics Systems directional sensor?

Applied Physics Systems communication protocols are documented for all our products in the User Manuals.

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