Gamma Logging

Measurement of the natural gamma rays emitted by various elements in the formation. Gamma ray logs are helpful for quantifying shaliness, well-to-well correlation, depth correlation between open- and cased-hole logs, and for correlation between logging runs.

M5™ Integrated LWD Service
Innovative, disruptive technology that maps reservoir and fluid boundaries more than 200 feet (60 meters) from the wellbore – over twice the depth of investigation of current industry offerings.
DGR™ Dual Gamma Ray Sensor
Providing accurate and reliable LWD natural gamma ray logs
ABG™ At-Bit Gamma Sensor
Real-time geosteering with the Geo-Pilot® rotary steerable system
Radian® Azimuthal Gamma Ray and Inclination Service
The Radian® azimuthal gamma ray and inclination service provides high-quality borehole images for geosteering, and precise gamma-ray measurements for reservoir evaluation.
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.

Gamma Logging

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Summary Summary Canada: GABI™ Sensor Provides At-Bit Technology to Help Maximize Reservoir Exposure and Increase Drilling Efficiency Sign in required
While drilling horizontal wells in the Cardium formation in Alberta, Canada, NAL Oil and Gas Trust needed to keep the wellbore within a 2 meter (6.6 feet) thick zone of interest to help maximize reservoir exposure.
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 Canada: GABI™ Sensor Provides At-Bit Technology to Help Maximize Reservoir Exposure and Increase Drilling Efficiency Sign in required
While drilling horizontal wells in the Cardium formation in Alberta, Canada, NAL Oil and Gas Trust needed to keep the wellbore within a 2 meter (6.6 feet) thick zone of interest to help maximize reservoir exposure.
Summary Summary Oilfield Technology: M/LWD Q&A Sign in required
2017 Oilfield Technology M/LWD Q&A article discusses the applications and benefits of the Radian™ Service and 9 1/2-inch ALD™ Service
Summary Summary Oman: In soft formation, Geo-Pilot® Dirigo™ 7600 RSS drills three complex legs in one run, saving operator 32.5 hours and US$40,000 Sign in required
In a development field with a soft formation, an operator needed a solution to drill a horizontal well in three “fork-type” legs with two openhole sidetracks in one run.
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 Oklahoma, USA: GABI™ Motor Solution Geosteers Exploration Well to Critical Coring Point Sign in required
Due to the short sensor-to-bit distance of the GABI motor, Sperry Drilling was able to locate and select a formation top that had previously been drilled through using other tools, precisely placing the wellbore at TD in the exact position the customer wanted.
Summary Summary Gulf of Mexico: Geosteering Solution Successfully Lands Wellbore in Difficult Section, Saving Operator USD 600,000 Sign in required
In a deepwater (water depth of over 7,000 ft (2,134 m)) location in the Gulf of Mexico, an operator was struggling to see the approaching reservoir top during the landing section.
Summary Summary Oklahoma, USA: First 6-3/4-inch GABI™ Motor Trial in USA Demonstrates Real-Time Value Drilling Shale Well Sign in required
The operator realized the value in knowing wellbore reactions closer to the bit provided real-time inclination updates, an improvement over previous jobs with data from sensors positioned further away from the bit. In addition, they were pleased that the GABI motor delivered the at-bit information even while sliding the motor, with no additional down time usually experienced with other imaging sensors while wiping through slides.
Summary Summary GOM: An operator saved an estimated US$500,000 by staying completely within the target window Sign in required
An operator in the Gulf of Mexico wanted to increase production and recovery in a mature field, but was faced by two main challenges.
Summary Summary Gulf of Mexico: GABI™ Motor Provides Superior At-Bit Technology for Real-Time Geosteering on GOM Continental Shelf Sign in required
The 4,952-foot (1,509-meter) hole section was delivered as planned in a single run (eliminating additional BHA changes), drilling 100 percent of the target sand. The interval was drilled in 43.5 drilling hours with an average rate of penetration of 114 feet per hour.
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 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 Texas, USA: GABI™ Motor Helps Deliver Well 100 Percent in Target Zone Sign in required
While drilling the 7,500-foot (2,286-meters) horizontal section of a 14,000-foot (4,267.2-meters) well in the Wolfcamp Shale in west Texas, the customer faced a 2,000-foot (609.6-meters) section with a slight anticline in the middle. Starting at about 9,300-feet (2,834.6-meters) measured depth (MD), the target zone sloped upwards from 6,000-feet (1,828.8-meters) true vertical depth (TVD) to 5,900-feet (1798.32-meters) TVD, and back down again to 6,000-feet (1,828.8-meters) TVD. Previous attempts at drilling this zone had resulted in breaking out of the top of the target formation, and losing hundreds of feet of productive interval. Additionally, this zone needed to be drilled smoothly to aid in running casing for completion.
Summary Summary Oklahoma, USA: GABI™ Motor and StrataSteer® 3D Service Provide Real-Time Geosteering Solution for Successful Well Placement in Critical Thin Bed Horizontal Sign in required
While drilling the 4,000-foot horizontal section of a 10,000-foot well in the Mississippi Lime near Alva, Oklahoma, the customer needed to maximize exposure to the 15-foot thick target formation and totally avoid the bounding shale above. Drilling into the shale above would introduce wellbore stability issues, and force the operator to sidetrack. Additionally, the operator needed to minimize the cost of the well while staying in zone. Previous attempts at drilling this zone had resulted in breaking out of the target formation, and having to pull back and sidetrack the well.
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 USA, North Dakota Bakken: Operator Achieves More Accurate Wellbore Placement Using a New Azimuthal Gamma Ray Service Sign in required
An operator in North Dakota’s Middle Bakken shale formation sought a solution that would enable effective drilling and geosteering in a formation with little gamma ray variation, while minimizing drilling costs.
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 Radian® Azimuthal Gamma Ray and Inclination Service
The Radian® azimuthal gamma ray and inclination service provides a cost-effective solution to geosteering challenges.
Summary Summary Oilfield Technology: M/LWD
This article discusses the applications and benefits of the Radian™ Service and 9 1/2-inch ALD™ Service.
Summary Summary M5™ Integrated LWD Service
Formation Evaluation and Drilling Optimization in One Compact Collar
Summary Summary ABG™ At-Bit Gamma Sensor
At-bit gamma sensor
Summary Summary DGR™ Dual Gamma Ray Sensor
Providing Accurate and Reliable LWD Natural Gamma Ray Logs
Summary Summary GABI™ Downhole Drilling Motor
Motor equipped with at-bit azimuthal gamma ray and inclination measurements for improved geosteering and optimum wellbore placement
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 M5™ Integrated LWD Service
Innovative, disruptive technology that maps reservoir and fluid boundaries more than 200 feet (60 meters) from the wellbore – over twice the depth of investigation of current industry offerings.
Summary Summary DGR™ Dual Gamma Ray Sensor
Providing accurate and reliable LWD natural gamma ray logs
Summary Summary Gamma Logging
Measurement of the natural gamma rays emitted by various elements in the formation. Gamma ray logs are helpful for quantifying shaliness, well-to-well correlation, depth correlation between open- and cased-hole logs, and for correlation between logging runs.
Summary Summary ABG™ At-Bit Gamma Sensor
Real-time geosteering with the Geo-Pilot® rotary steerable system
Summary Summary Radian® Azimuthal Gamma Ray and Inclination Service
The Radian® azimuthal gamma ray and inclination service provides high-quality borehole images for geosteering, and precise gamma-ray measurements for reservoir evaluation.
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.
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