[vc_row][vc_column][vc_column_text] Wireline [/vc_column_text][vc_empty_space height="48px"][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]Downhole logging operations are conducted using one of two wireline cable types. The standard cable is a Vector 7-46PXS heptacable, which consists of a core of seven multi-stranded copper wire conductors surrounded by filler and insulation and encased in two layers of high-strength steel...
Description The MWD-TeleScope tool is an in-line drill collar that records at-the-bit drilling parameters and telemeters the drilling parameter data as well as data from other LWD tools to the surface in real time. MWD measurements include downhole weight-on-bit and torque, shocks, temperature, flow rate, rate...
Description The Logging-While-Drilling-EcoScope (LWD-EcoScope) is the first Schlumberger LWD multifunction tool that provides a complete set of formation evaluation measurements without using the traditional chemical sources. A pulsed neutron generator (PNG) replaces the americium-berillium (AmBe) source commonly used for porosity measurements, while an optional neutron gamma...
Description The Logging-While-Drilling-geoVISION (LWD-geoVISION) tool makes laterolog resistivity measurements. As a formation evaluation tool, its application is limited to conductive muds. It may be run in several configurations and provides up to five resistivity measurements. The geoVISION contains a scintillation gamma ray detector which supplies a...
Description The Schlumberger Logging-While-Drilling-proVISION (LWD-proVISION) tool performs magnetic resonance measurements in the borehole and transmits them in real-time to the surface. Magnetic resonance provides parameters that are not measured by traditional LWD tools such as permeability, free- and bound fluid-volume, type of fluid, and mineralogy-independent porosity....
Description Acoustic waveforms are acquired while drilling with the Schlumberger Logging-While-Drilling-sonicVISION tool (LWD-sonicVISION). One transmitter and four receivers are positioned within a drill collar just above the bit to collect compressional transit times just seconds after the rock has been cut. As with all Logging-While-Drilling tools,...
Description The Logging-While-Drilling-adnVISION (LWD-adnVISION) tool provides real-time apparent neutron porosity, formation bulk density and photoelectric factor data to characterize formation porosity and lithology while drilling. These nuclear measurements are borehole compensated for improved accuracy. 360-degree images of density and porosity result from the rotation of the...
Description The Logging-While-Drilling-arcVISION (LWD-arcVISION) is a compensated array resistivity tool developed by Schlumberger for medium to large boreholes. The 6.75 in (17 cm) diameter tool makes multiple, borehole-compensated phase shift and attenuation resistivity measurements at two frequencies: 2MHz and 400kHz. The tool’s antenna array consists of...
Description The physics of the measurements made by the LWD-CDN tool were similar to those of corresponding wireline services. For the neutron porosity measurement, fast neutrons were emitted from a 7.5-curie Americium-Beryllium (Am-Be) source. The quantities of hydrogen in the formation, in the form of water- or oil-filled porosity, primarily...
Description The Wireline Heave Compensator (WHC) is an “active” heave compensation system designed to counter the vertical motion (heave) of a ship caused by waves, thus keeping subseafloor logging tools in a fixed position. Such devices are also commonly referred to as Wave Motion Compensators or WMCs. Operationally,...