Abstract: A well logging system that includes a tool which is deployed within the well. The tool has a housing in which imaging hardware is stored, and on which sensors are located, where the sensors detect and measure electrical signals that have been induced in the formation surrounding the well. A wiper system is also mounted on the housing for clearing mud and other debris from outer surfaces of the sensors.

Abstract: A modulator is disclosed for creating a pressure pulse in a fluid-filled well. The modulator comprises a tool body on which a plurality of extendable arms are mounted. The arms may be retracted into a stowed position substantially adjacent the tool body, or may be extended to meet the wall of the borehole. The arms are preferably resilient bowsprings that may be flexed outwards from the tool by means of an actuator pushing on at least one end of the springs. A flexible valve sleeve or bag is suspended between the arms and cooperates with a valve mounted adjacent the sleeve on the tool body. The valve sleeve creates a fluid-flow path through the valve, and in operation, the valve closes one end of the valve sleeve to create the pressure pulse. Sealing of the valve sleeve against the wall of the well is a result of the fluid pressure inflating the sleeve against the well wall. As a result, sealing takes place over an extended area of the bag and is dynamically responsive to changes in fluid flow or pressure.

Abstract: A modulator is disclosed for creating a pressure pulse in a fluid-filled well. The modulator comprises a tool body on which a plurality of extendable arms are mounted. The arms may be retracted into a stowed position substantially adjacent the tool body, or may be extended to meet the wall of the borehole. The arms are preferably resilient bowsprings that may be flexed outwards from the tool by means of an actuator pushing on at least one end of the springs. A flexible valve sleeve or bag is suspended between the arms and cooperates with a valve mounted adjacent the sleeve on the tool body. The valve sleeve creates a fluid-flow path through the valve, and in operation, the valve closes one end of the valve sleeve to create the pressure pulse. Sealing of the valve sleeve against the wall of the well is a result of the fluid pressure inflating the sleeve against the well wall. As a result, sealing takes place over an extended area of the bag and is dynamically responsive to changes in fluid flow or pressure.

Abstract: A data storage library comprising a plurality of library modules (13, 15) for storing a plurality of data storage media (35) and writing data to and reading data from said media (35), at least two of said library modules (13, 15) being in adjacent vertical arrays, and transfer means (33) for transferring said media (35) from one array to an adjacent array, the transfer means (33) effecting translation of the data storage media (35) from one array to the adjacent array in a substantially horizontal direction whilst substantially maintaining the orientation of the transferred media (35) relative to respective arrays.

Abstract: A data storage library comprising a plurality of library modules (13, 15) for storing a plurality of data storage media (35) and writing data to and reading data from said media (35), at least two of said library modules (13, 15) being in adjacent vertical arrays, and transfer means (33) for transferring said media (35) from one array to an adjacent array, the transfer means (33) effecting translation of the data storage media (35) from one array to the adjacent array in a substantially horizontal direction whilst substantially maintaining the orientation of the transferred media (35) relative to respective arrays.

Abstract: Data storage units (1) for storing a plurality of individual data storage media (12), the units comprising at least one removable magazine (9, 10) in which the individual data storage media (12) can be stored within the units (1), the magazines (9, 10) being removable from the front of the units (1). At least one drive (5, 6) which reads data from or writes data to individual data storage media (12) is positioned relative to the magazine(s) (9, 10) so that the storage media (12) are fed therein and removed therefrom in a direction substantially perpendicular to the direction in which the media are removed from the magazine(s) (5, 6). A selector (20) facilitates the selective removal of media (12) from the magazines (9, 10) in which they are stored, and feeds them into the drive (5, 6), and vice versa.

Abstract: A data storage library comprising a plurality of library modules (13, 15) for storing a plurality of data storage media (35) and writing data to and reading data from said media (35), at least two of said library modules (13, 15) being in adjacent vertical arrays, and transfer means (33) for transferring said media (35) from one array to an adjacent array, the transfer means (33) effecting translation of the data storage media (35) from one array to the adjacent array in a substantially horizontal direction whilst substantially maintaining the orientation of the transferred media (35) relative to respective arrays.