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Porosity/Lithology

This service is provided by two ranges of complementary equipment: standard and Compact™ tools. Standard tools are based on OD tools greater than 3 3/8-in., with upper limits of 20,000 PSI (137.9 MPa) and 350°F (177°C). Compact equipment is based on the latest technology in 2 1/4-in. sondes, providing unrivaled access and unique methods of conveyance, including memory operations.

Standard Tools
The spectral Pe density (SPeD) sensor accurately measures the formation bulk density and formation photoelectric absorption cross-section index for use in lithology determination. Bulk density measurements can be used to accurately measure formation porosity.

The compensated neutron tool (CNT) provides a high-resolution, borehole-compensated porosity measurement. The CNT can be used in open and cased wellbores.

The spectral gamma ray (SGR) sensor measures naturally occurring formation radiation (or the total gamma ray spectrum) and splits it into its three predominant components: potassium, uranium and thorium. The SGR sensor can be used for correlation, reservoir delineation, shale volume calculation, radioactive mineral location and clay type estimation.

The gamma ray (GR) sensor measures naturally occurring formation radioactivity, which is used for correlation, lithology determination and shale volume calculation. The GR sensor is effective in almost any borehole environment, including cased wellbores.

The nuclear-magnetic resonance tool (NMRT™) measures the petrophysical properties of rocks and formation fluids using nuclear-magnetic resonance imaging technology.

The universal gamma ray (UGR) sensor measures natural radioactivity in the borehole and is used for correlation and lithology evaluation. The UGR tool is typically run in combination with other logging tools. It can be used in almost any borehole environment, making it an effective correlation device.

COMPACT™ Tools
The Compact photodensity sonde (MPD) is an advanced density, caliper and photoelectric (Pe) tool for lithology and density determinations in conventional and ultra-slim wells. Small diameter and short length give unrivaled dogleg capability and reduce rathole drilling.

The Compact dual neutron sonde (MDN) provides porosity measurements in a uniquely wide range of well styles. It is fully characterized for air- and mud-filled environments and fully combinable with other Compact format tools.

Incorporating the latest advances in modeling and detector technologies, the MDN tool delivers excellent porosity sensitivity with a 65 percent reduction in source activity and consequential safety and transportation benefits.

The Compact gamma (MCG) & auxiliary gamma sub (MGS) combines gamma ray, temperature and CCL logs with power conversion and surface communications for all other measurements in a Compact tool string. The MGS is shorter and can be placed anywhere in the string, allowing gamma ray and temperature to be recorded close to the bottom of the well.

The spectral gamma sonde (SGS-C) measures the number and energy of naturally occurring gamma rays, from which the relative abundances of formation potassium, uranium and thorium are determined. The large crystal results in a tool OD of 3 1/2 in. (90 mm).


 
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