Technology

19 Aug Dipole Shear Sonic Tool (SST)

Description The Dipole Shear Sonic Tool was developed at Lamont-Doherty Earth Observatory. It consisted of a piezoceramic monopole compresional wave transmitter (12-14 kHz), a wideband dipole shear wave transmitter (2-4 kHz), and a semirigid receiver array, including four compressional wave and three shear wave receivers. The...

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19 Aug Temperature Logging Tool (TLT)

Description Because a separate logging run dedicated solely to heat flow measurement is not economically feasible, the Borehole Research Group at LDEO designed a self-contained tool that could be attached to the bottom of any of the Schlumberger strings or to the BRG specialty tools from...

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19 Aug Natural Gamma Ray Spectrometry Tool (NGT*)

Description The Natural Gamma Ray Tool (NGT) utilized a sodium-iodide scintillation detector to measure the natural gamma ray radiation of the the three most common components of the naturally occurring radiation: potassium, thorium, and uranium. The high-energy part of the spectrum was divided into three energy windows, each covering...

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19 Aug SlimXtreme Array Induction Imager Tool (QAIT*)

Description The Array Induction Imager tool accurately measures the borehole formation conductivity in open holes as a function of both depth and distance from the borehole; the SlimXtreme version (QAIT) was designed to work in slim holes under severe environmental conditions. Wireline array induction tools employ...

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19 Aug Scintillation Gamma Ray Tool (SGT*)

Description During DSDP and the early part of ODP, the Scintillation Gamma Ray Tool (SGT) was more widely known as the Natural Gamma Ray Tool (GR). All gamma ray tools record naturally occurring gamma rays in the formation adjacent to the borehole. Therefore, they provide a...

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19 Aug Versatile Seismic Imager (VSI*)

Description The Versatile Seismic Imager (VSI) represents the latest available technology in the acquisition of seismic waves generated by a seismic source. The VSI employs three-axis single sensor seismic hardware and software and advanced telemetry for efficient transmission of the data from the borehole to the...

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19 Aug Well Seismic Tool (WST*)

Description The WST was a Schlumberger single axis check shot tool used for zero offset vertical seismic profiles (VSP). The WST consisted of a single geophone, pressed against the borehole wall, that was used to record the acoustic waves generated by an air gun located near...

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19 Aug Sonic Digital Tool (SDT*)

Description In fast formations, where shear velocity is faster than the velocity of the drilling fluid, the SDT obtained direct measurements for shear, compressional, and Stoneley wave values. In a slow formation, the SDT obtained real-time measurements of compressional, Stonily, and mud wave velocities. Shear wave values could then be...

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