OVERVIEW

The Circumferential Acoustic Scanning Tool–Extended-Range Total (CAST-XRT™) cement evaluation tool represents the latest development in well integrity diagnostics in harsh well environments. This technology is designed to evaluate cement and pipe integrity in challenging environments, with the capability to evaluate a range of casing thicknesses in light to very heavy muds.

The CAST-XRT tool is designed to operate in most drilling fluid systems – such as   in brine, water-based mud (WBM), oil-based mud (OBM), and synthetic-based mud (SBM) – with densities up to 18 lb/gal. The tool’s total range of operation includes the ability to evaluate cement and pipe integrity in casings with wall thicknesses from .35 inches up to 1.2 inches in extreme drilling fluid conditions.

Several acoustic-related innovations have been incorporated into the new CAST-XRT tool, including a high-sensitivity/low-noise next-generation acoustic

transducer, programmable tuned pulses, and high-powered ultrasonic pulses at various pipe resonant frequencies. The new transducer design helps to ensure a substantial reduction in mud and casing-related wave attenuation effects.

To increase operational efficiency, the CAST-XRT tool can simultaneously evaluate cement and casing conditions with fully programmable data acquisition, thus optimizing logging speeds for maximum coverage.

BENEFITS

» Identifies top-of-cement and mud-induced channels behind casing with 360° high-resolution imaging

» Simultaneously determines drilling-related casing wear and cement bonds in a single pass without any changes in wellbore fluid

» Eliminates log uncertainty and rig standby costs, with a logging solution that is less sensitive to mud- or casing-related influences

» Combines with Pad Bond Tool (PBT) and Borehole Sonic Array Tool (BSAT™) services for single-pass and multiple-measurement cement evaluations

» Accurately evaluates foam, lightweight cement, and other complex cement slurries, using the Halliburton Advanced Cement Evaluation (ACE™) processing service

FEATURES

» Multiple scanner-head sizes enable operation from a 45⁄8-inch to 20-inch internal diameter (ID), allowing for well integrity diagnostics in multiple casing sizes, including drilling risers

» Mud-cell chamber acquires real-time continuous traveltime (FTT) data, thus ensuring measurement accuracy, even in high-density OBMs/SBMs

» LOGIQ® telemetry enables multiple openhole logging tool combinability options to customize logging operations and help increase logging efficiency

» Fully programmable azimuthal and vertical data acquisition rates ensure that every logging operation is customized to the well conditions, thus optimizing logging speed and maximizing casing well coverage