Description The Modular Temperature Tool (MTT) is a flexible, general-purpose third party temperature logging tool developed by the Lamont-Doherty Earth Observatory Borehole Research Group. It replaces two previous temperature logging tools: 1) the Temperature-Acceleration-Pressure probe (TAP), which was limited to temperatures below 85°C and operated only...
Description The Multi-Sensor Spectral Gamma Ray Tool (MGT) is a third party tool developed by the Lamont-Doherty Borehole Research Group to improve the vertical resolution of natural gamma-ray logs. This is achieved by using an array of short detector modules with approximately 2 ft (60 cm)...
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...
Description The Borehole Televiewer (BHTV) was an acoustic device that scanned the wall of a borehole, producing an image of the reflectivity of the rock surrounding the wellbore as function of depth and azimuth. The BHTV was manufactured by SIMPLEC under license from Mobil Oil Corporation. The BHTV...