Quasar Pulse™ Extreme-Temperature MWD/LWD Service

With the Quasar Pulse™ Extreme-Temperature MWD/LWD service, Sperry Drilling  extends the reach of current M/LWD sensors to temperatures of 392°F/200°C and pressures of 25,000 psi (172 MPa). This service provides reliable measurements of well trajectory, borehole pressure, drillstring vibration and natural gamma ray emissions in the most extreme downhole environments.

The rugged Quasar Pulse sensors are designed to withstand downhole vibration and are rigorously tested to ensure operational reliability, delivering exceptional performance in the most challenging HP/HT applications. Without the Quasar Pulse service, the operator has no option but to drill extreme-temperature reservoirs "blind", increasing the associated drilling risks.



  • Single integrated collar that includes sensors which are rated up to 392°F (200°C) and 25,000 psi (172 MPa):
    • Telemetry
    • Directional
    • Gamma Ray
    • PWD
    • Vibration
  • Same measurement performance as standard tools


  • Improved reliability in Solar® (175°C) temperature range over existing tools
  • Access reserves inaccessible with standard tools
  • Potential for geosteering in high-temperature reservoirs
  • Real-time monitoring of down-hole conditions, when accurate knowledge of pressures and temperatures is critical
  • Reduce costs by avoiding the need to “stage” tools in the hole or use mud chillers to keep them cool

Quasar PulseSM M/LWD Sensors

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Summary Summary LWD Log Interpretation Charts Sign in required
This document provides an insight into the sensitivity of LWD measurements to changes in the borehole environment and the impact that this has on the evaluation of a reservoir.
Summary Summary Haynesville Shale LA, USA: ExtremeHT-200™ M/LWD Sensors Help Operator Save Over US$145,000 Sign in required
An operator in the Louisiana Haynesville shale play required reliable and accurate measurement/logging-while-drilling (M/LWD) data while drillling horizontal wells in an extreme high temperature environment.
Summary Summary South East Asia: Quasar Pulse℠ M/LWD service saves customer approximately USD 1 Million Sign in required
An operator wanted to reduce costs and achieve logging objectives on high-temperature wells drilled from a jack up rig in 243 feet (74 meters) of water, offshore South East Asia, where bottomhole temperatures are among the highest in the world.
Summary Summary Quasar Trio® M/LWD Triple-Combo Service
The Quasar Trio® M/LWD triple-combo service comprises optional resistivity, azimuthal density, and neutron porosity sensors, which can be added to the required Quasar Pulse™ service collar to provide a complete formation-evaluation service at temperatures up to 200°C (392°F and pressures up to 172 MPa (25,000 psi).
Summary Summary Quasar Pulse M/LWD Service
The Quasar PulseSM measurement/logging-while-drilling (M/LWD) service delivers exceptional performance even at extreme temperatures, providing accurate and timely reservoir measurements for precise wellbore placement.
Summary Summary HP/HT: 6. Total
Halliburton continues to push the limits of HP/HT technologies and processes for increasing efficiency, recovery, safety and reliability
Summary Summary HP/HT: 3. Definition
UltraHT-230 redefines the standard, reliably taking operators to the next level
Summary Summary HP/HT: 1. Overview
Ultra High Temperature - the next fontier for oil and gas exploration
Summary Summary HP/HT: 2. Rethinking
UltraHT-230 M/LWD sensors
Summary Summary Quasar Trio® M/LWD Triple-Combo Service - Thailand R&M Facility Video
Learn the benefits of this service and take a quick tour of the R&M facility. (No audio.)
Summary Summary HP/HT: 5. Depth
UltraHT-230 sensors help make drilling less perilous, more productive and more cost effective than ever before
Summary Summary HP/HT: 4. Testing
UltraHT-230 sensors tested for conditions well beyond anything available today
Summary Summary World's First Extreme-High-Temperature LWD Triple-Combo Run
With extreme bottomhole static temperatures approaching 392°F (200°C), some of the wells in the Gulf of Thailand are among the hottest in the world – far beyond the reach of conventional measurement-while-drilling/logging-while-drilling(M/LWD) tools.
Summary Summary Quasar Pulse Extreme-Temperature M/LWD Service
Integrated LWD service for high-temperature operation, up to 200°C (392°F), providing gamma ray, directional survey, borehole pressure and drill-string vibration measurements.
Summary Summary Mud-Pulse Telemetry Services
The mud pulse systems use valves to modulate the flow of drilling fluid in the bore of the drillstring, generating pressure pulses that propagate up the column of fluid inside the drillstring and then are detected by pressure transducers at the surface.
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