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The Rotary Sidewall Coring Tool (RSCT) is designed to drill core plugs perpendicular to the borehole wall. After correlating and positioning at the desired core point with the internal Gamma Ray detector, a backup arm is extended to decentralize the tool and hold the tool securely against the formation. A diamond bit rotating at 2000 rpm cuts a 15/16" x 1-3/4" sample from the formation, and telemetry from the tool allows the operator to continuously monitor the coring process. After the sample has been cut, a slight vertical movement of the bit breaks the core sample from the formation. The sample is withdrawn into the tool and the core is ejected into a receiver tube. The tool is then ready for the next selected core point. Up to 30 core samples may be cut on one trip in the well.
Core samples obtained with the RSCT do not suffer the damage caused by percussion coring methods, and they may therefore be used interchangeably with plugs obtained from conventional cores (usually at much higher cost) for quantitative petrophysical measurements. Extremely good recovery is possible even in very hard, consolidated formations. Cores can be selected over long intervals, or over a single short interval to delineate a zone. Intervals or shows discovered from logs in zones that were not included in the original coring program can thus be cored.
The photographs below are of an unused pristine pair of rare Halliburton / Gearhart Rotary Sidewall Coring Tools. This offer includes downhole electronics, surface electronic panels, cables, documentation, and oodles of spare parts. These tools have never been used, and have been stored in a government warehouse since they were purchased.
See the Halliburton / Gearhart Rotary Sidewall Coring Tool (RSCT) Inventory (pdf file) for a partial detailed list of equipment, spares, and supplies.
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