Technology

19 Aug Geochemical Logging Tool (GLT*)

Description [caption id="attachment_849" align="alignright" width="256"] Figure 1. Schematic of the GLT tool[/caption] Geochemical Logging Tool (GLT) used three separate modes of gamma-ray spectroscopy to obtain measurements of most of the major oxides that make up sedimentary and igneous rocks. Initial measurements provided estimates of Si, Al, Fe, Ca, K, U and...

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19 Aug General Purpose Inclinometry Tool (GPIT*)

Description The GPIT* General-Purpose Inclinometry Tool provides inclinometer measurements. Tool orientation is defined by three parameters: tool deviation, tool azimuth, and relative bearing. The GPIT tool uses both a three-axis inclinometer and a three-axis magnetometer to make measurements for determining these parameters. The basic principle of downhole...

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19 Aug Dipole Sonic Imager Tool (DSI-2*)

Description The Dipole Sonic Imager Tool (DSI-2) combines high-speed telemetry with simultaneous, 12-bit dynamic range digitization of an eight-receiver array. The sonde incorporates both monopole and crossed-dipole transmitters with an eight-station array of electronically configurable hydrophones for monopole and dipole reception. Combining new dipole-based technology with...

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19 Aug Dual Laterolog (DLL*)

Description The Dual Laterolog (DLL) provided two resistivity measurements with different depths of investigation into the formation: deep (LLd) and shallow (LLs). In both devices, a current beam 2 ft-thick (A0) was forced horizontally into the formation by using focusing (also called bucking) currents (A1- A2,...

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18 Jul Formation MicroScanner (FMS*)

Description [caption id="attachment_473" align="alignright" width="180"] Sixteen-electrode arrangement for the four-pad tool.[/caption] The Formation MicroScanner sonde (FMS) consists of four orthogonal imaging pads each containing 16 microelectrodes which are in direct contact with the borehole wall during the recording. The button current intensity is sampled every 0.1 in...

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13 Jun Compensated Neutron Log (CNL*)

Description The compensated neutron log tool (CNL) contained a 16-curie Am/Be radioactive source that bombarded the formation with fast neutrons and two detectors at different spacings from the source. The neutrons were slowed down through elastic collision with the formation nucleii and then captured, primarily by...

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13 Jun Azimuthal Resistivity Imager (ARI*)

Description The Azimuthal Resistivity Imager (ARI) was a laterolog tool that made deep measurements and azimuthal resistivity images around the borehole. At the time it helped analyze features and details that escaped conventional resistivity measurements: thin beds (down to 8 in, 20 cm), borehole formation heterogeneity,...

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