Description The Magnetic Susceptibility Sonde version B (MSS-B) is a wireline logging tool that measures borehole magnetic susceptibility at two vertical resolutions and depths of investigation. The tool incorporates a single-coil sensor designed to provide high-resolution measurements of magnetic susceptibility. This sensor was developed by Bartington Instruments. The...
Description The Core Barrel Temperature Tool (CB-TT) was developed by the Borehole Research Group in order to assess temperature conditions while drilling and determine if conditions were favorable for subsequent wireline and Logging-While-Drilling operations in hydrothermal environments. Along with the Drill String Acceleration Tool CB-DSA-XM, the...
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...
Description In homogeneous formations with resistivity higher than 100 ohm m the average radial depth of investigation is about 5 ft (1.5 m) and 2.5 ft (76 cm) for the deep and medium induction curves, respectively, and 1.25 ft (38 cm) for the SFL. This drops...
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...
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...
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...
Description The Core Barrel- Extended Memory Drill String Accelerometer (CB-DSA-XM) was developed during ODP at USIO Science Services/LDEO as a modification of the CB-DSA, which was used on several ODP legs. The CB-DSA-XM operates as a memory tool that measures and records drill string acceleration and...
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...
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...