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,...
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...
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 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 The Multifunction Telemetry Module (MFTM) is a wireline logging telemetry system that allows a string of LDEO wireline tools to operate in a Schlumberger (SLB) toolstring and acquire data in a single logging pass. The MFTM system has a modular design and operates in three configurations: SLB...
Description The Core Barrel – Retrievable Memory Module (CB-RMM) may be deployed routinely with all standard IODP core barrels. It has been designed to capture incoming weight-on-bit, torque-on-bit, and pressure data from the Drilling Sensor Sub via a wireless inductive link. The data are transmitted between two...
The lockable flapper valve (LFV) is a component of the APC/XCB Bottom Hole Assembly (BHA). It is hinged and sprung on one side and is designed to prevent fluids from backflowing up the drill pipe. The LFV presents an obstacle for the logging operation, as a closed LFV...
Description Although the standard Schlumberger sonic logs could provide accurate compressional velocities, the additional information from the multi-channel sonic log tool (MCS) enabled determination of the elastic properties of the formation and a qualitative estimate of fracture transmissivity. The MCS was a multi-receiver, single-source sonic logging tool...