DGR™ Dual Gamma Ray Sensor


The DGR™ tool provides accurate LWD natural gamma ray logs with Sperry Drilling services' proven reliability. The DGR sensor is an integral part of Sperry's LWD services, which include gamma ray, resistivity, neutron porosity, spectral density, dipole sonic, formation tester and caliper measurements. It can also be combined with directional surveying and drilling efficiency tools, such as the pressure-while-drilling (PWD) and DDSr™ drillstring dynamics sensors.


  • Correlation
  • Shale volume calculation
  • Casing/coring point selection
  • Geosteering

SOLAR: this sensor also exists in the high temperature/high pressure version. Please check the sensor datasheet for exact specifications. 

DGR™ Dual Gamma Ray Sensor

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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 Oman: SOLAR Quad-Combo Saves 2-3 Days in HPHT wells Sign in required
In Oman, the operator of two high-temperature land gas wells wanted wireline-quality logs without the time and expense of wireline operations.
Summary Summary Gulf of Mexico: Sperry Combines ALD™ and DGR™ Sensor Data for Innovative Solution in Difficult GOM Deepwater Well Sign in required
In this deepwater well in the Gulf of Mexico, the customer began experiencing problems with the borehole after successfully drilling to the conventional core point of the main reservoir.
Summary Summary Middle East: Operator Gathers Valuable Formation Features with the Only Service in Larger Hole Sizes Sign in required
Due to a lack of seismic data in a challenging remote location offshore in the Middle East, an operator was drilling several deepwater pilot holes for gas exploration in order to gain as much information as possible for well correlation and to gather insight into understanding the geological structure and depositional environment.
Summary Summary Mexico: Sperry Drilling’s New Data Compression Software Facilitates Geosteering Within Thin Reservoir while Significantly Reducing Drilling Time Sign in required
In this shale gas well in the Eagle Ford play in Mexico, the primary objective was to drill a horizontal well with maximum lateral exposure within the 10 feet (3 meters) thick production zone. The challenge was to stay in the relatively thin shale pay zone while maintaining an aggressive rate of penetration.
Summary Summary U.K. Offshore: Operator Saves Significant Rig Time by Gathering Complete Formation Evaluation Data in Real Time Sign in required
In an offshore U.K. well, an operator needed to obtain a complete formation evaluation (FE) data set to measure reservoir and overburden characteristics in a deviated well.
Summary Summary Oman: Operator Proves Cost Savings With LWD High-Resolution Imaging Service Sign in required
Borehole imaging is one of the most rapidly advancing technologies in wireline logging and logging while drilling (LWD). In an onshore horizontal well in Oman, an operator needed more details of the geology in the reservoir in order to gain a better understanding of the distribution of faults, natural fractures, borehole breakouts, and drilling-induced fractures along the well path.
Summary Summary North Sea, Norway: Operator Successfully Runs 5 ¾-inch Slim-Hole Drilling Operation with Geo-Pilot® RSS System Sign in required
In a mature field on the Norwegian Continental Shelf of the North Sea, an operator had attempted twice to drill a new extended-reach drilling (ERD) wellbore with a 2.05 measured depth (MD) to true vertical depth (TVD) ratio that resulted in the bottomhole assembly (BHA) becoming lost in hole above the reservoir.
Summary Summary Ecuador:Operator Saves a Well from Abandonment in Problematic Field Sign in required
Operaciones Rio Napo, an operator in Ecuador, was drilling a difficult wellbore section with multiple formation changes consisting of interbedded shales, limestones, and sandstones.
Summary Summary Mexico: Operator Saves Time USD 7.5 Million in Deepwater Rig Time by Acquiring Crucial Formation Evaluation Data in Real Time Sign in required
An operator on a deepwater well had recently issued an internal mandate seeking opportunities to reduce the authorizations for expenditure (AFEs) associated with drilling its oil and gas exploration and development projects.
Summary Summary DGR™ Dual Gamma Ray Sensor
Providing Accurate and Reliable LWD Natural Gamma Ray Logs
Summary Summary DGR™ Dual Gamma Ray Sensor
Providing accurate and reliable LWD natural gamma ray logs
Summary Summary Logging-While-Drilling (LWD)
Halliburton delivers the highest quality borehole, early and accurate Logging-While-Drilling (LWD) formation evaluation, optimal wellbore placement, and maximum reservoir drainage. We continue to lead the industry with the widest array of MWD/LWD technologies.
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