Robust enough to withstand the well logging environment, the MFC tool measures changes in diameter of a few thousandths of an inch, using an array of low contact pressure sensor fingers. Individual finger measurements and tool orientation are transmitted to the surface on any type of electric wireline, or stored in a downhole memory in slick line operation.

    Operating times are short, with digital transmission giving quarter inch depth resolution at logging speeds of 1800 feet per hour. The motorised roller centralisers and fingers can be opened or closed at any time, so that multiple logging passes can be made if required. The centralisers hold the tool on the well axis even in a horizontal position.

    The equipment required to perform a survey is compact, heli-portable, and can be operated by a single engineer. A standard system includes downhole tools, depth system, PC and telemetry interface. The compact tool string can be rigged up in less than twenty feet, and run on any electric line in surface readout mode. This all adds up to flexible, low cost mobilisations at short notice, and a safer, easier rig up once the equipment is on site.