Abstract: A method and apparatus is provided for measurement-while-drilling utilizing improved antennas. An elongated tubular member is provided with an outer peripheral surface having a contoured portion defining a plurality of discrete communication regions of reduced radial dimension. An antenna pathway is defined in the elongated member substantially transverse to the plurality of discrete communication regions. An antenna member is partially disposed in the antenna pathway with portions of the antenna member extending out of the elongated member at the plurality of discrete communication regions to facilitate communication of electromagnetic energy. In a reception mode of operation, the antenna member detects electromagnetic energy in the wellbore and generates a current corresponding thereto. If operated in a transmission mode of operation, the antenna member emits electromagnetic energy in the wellbore in response to an energizing current.

Abstract: A method and apparatus for blown film extrusion is described. An annular die receives a molten material and extrudes a film tube. At least one cooling ring is positioned adjacent the annular die for passing an air stream along a particular surface of the film tube. A blower entrains and supplies air to the cooling ring. A flow sensor is positioned in an air flow path intermediate the at least one cooling ring and the blower. It provides a mass air flow signal which is a measure of air mass flow per unit time. An adjustable air flow attribute modifier is placed in communication with the air flow path and operates to selectively modify the air mass flow per time unit. A controller member is in communication with the flow sensor and the adjustable air flow attribute modifier, for receiving the mass air flow signal and for controlling the adjustable air flow attribute modifier to provide a preselected value of air flow in terms of air mass flow per unit time.

Abstract: A client/server-based secure timekeeping computer system is provided. A secure-time server which is located in a physically trusted environment, includes a highly accurate time-of-day (TOD) clock, along with a key storage area containing a table of public/private key pairs corresponding to clients in the client/server network. The server encrypts a current time value from its TOD clock using a private key corresponding to a selected client. The encrypted time value is then sent to the client over an open communications channel. Each client in the network is equipped with its own secure timekeeping facility housed within the secure boundaries of a single, tamper-proof VLSI chip. Upon receipt of a secure-time transmission, a client uses its own copy of its private key to decrypt the time value, then loads the decrypted time value into its TOD clock.

Abstract: A method and apparatus is provided for facilitating operator initiated integration of items between software objects in a graphical user interface. In this technique, the operator selects a source software object and one or more target software objects. The source software object and the target software objects include data items which may be copied by the operator between the software objects during an accelerated integration mode of operation. During the accelerated integration mode of operation, a graphical pointing device is utilized by the operator to select items which are present in the source software object. By manipulating the graphical pointing device, the operator selects items from the source software object for automatic inclusion in the one or more target software objects, while the graphical pointing device is maintained entirely within the source software object. A visual indication is automatically provided which is representative of the step of automatically copying.

Abstract: A method is provided for authenticating communication partners utilizing communication flows which are passed over an insecure communication channel. The method includes a number of method steps. A trusted intermediary is provided which is capable of communication with the communication partners over the insecure communication channel. A plurality of long-lived secret keys are provided, one for each communication partner. The plurality of long-lived secret keys are distributed to a particular one of the communication partners, and to the trusted intermediary. Therefore, the long-lived secret key is known only by the particular communication partner to which it is assigned, and the trusted intermediary. A request for communication between communication partners is provided to the trusted intermediary. The trusted intermediary is utilized to generate a short-lived secret key for utilization in a communication session between the communication partners.

Abstract: A method and apparatus is provided for facilitating operator initiated integration of items between software objects in a graphical user interface. In this technique, the operator selects a source software object. The source software object includes data items which may be selected by the operator. During an integrated operation mode of operation, a graphical pointing device is utilized by the operator to data select items which are present in the source software object. By manipulating the graphical pointing device, the operator then selects a particular icon, which includes representative of either software objects or data processing implemented operations. The data processing system is programmed to then automatically initiate a particular data processing implemented operation which involves the recorded operator selection of the data items and the software object or data processing implemented operation which is represented by the icon selected by the operator.

Abstract: A method is described for substantially concurrently performing entity authentication operations and short-lived secret key distribution operations over an insecure communication channel between communication partners, wherein authenticity of communication partners is determined by possession of the long-lived shared secret key. The method includes a number of steps. Data flows are exchanged between the communication partners to define a composite key. At least a portion of the data flows have been encrypted or otherwise masked in a manner which utilizes the long-lived shared secret key. At least one authentication tag is passed between communication partners over the communication channel. The at least one authentication tag is based at least partially upon the composite key. The authentication tag is utilized to determine the authenticity of at least one communication partner.

Abstract: A whipstock assembly is provided for lowering within a cased wellbore, cutting a window through a casing for drilling a sidetrack borehole, and retrieving with conventional fishing tools. The whipstock assembly includes two separate whipstocks having different tapers, and which are releasibly coupled for separately retrieving from the cased wellbore. A barrier member is provided to prevent a tapered face of one of the whipstocks from wedging debris between the whipstock and the casing.

Abstract: A method is provided for deriving wellbore azimuth in a manner which reduces the impact of axial magnetic field errors, which utilizes a plurality of estimates of the axial component of the magnetic field which are combined in a manner which emphasizes the better estimates and deemphasizes the poorer estimates.

Abstract: The present invention is directed to a method and apparatus for determining that a drillstring in a wellbore is susceptible to sticking against a wellbore surface. When characterized as a method, the method steps include (1) monitoring a vibration characteristic of the drillstring during drilling operations, and (2) comparing the vibration characteristic with at least one prior vibration characteristic to identify impending sticking. In the preferred embodiment, vibration amplitude is monitored to detect amplitude diminishment which is indicative of impending pipe sticking. Preferably, vibration data is subjected to a stabilizing signal processing operation which minimizes the adverse impact of noise and normalizes the data to facilitate comparison with prior time periods. Preferably, the data is presented and displayed in a time-domain format to allow visual comparison over a selected time interval.

Abstract: A method and apparatus is provided for visually representing data processing operations in a data processing system. An action feedback message is provided for a particular data processing operation. It includes a non-textual message component. Communication between an operator and the data processing system is monitored for requests for performance of the particular data processing operation. For each time a particular data processing operation is performed by the data processing system, the action feedback message is automatically displayed on a display of the data processing system, preferably for a predetermined time interval during the performance of the particular data processing operation. The action feedback message may be moved along a predetermined display path on the display of the data processing system during automatic display.

Abstract: A warning light system is provided for use in a motor vehicle having a cab region for accommodating a vehicle driver, and a brake light system including a voltage source and an electrically actuated lamp disposed at the rear of the vehicle. The warning light system provides a warning system to motorists rearward of the vehicle. The motorists have on average a reaction time above a reaction time threshold. The warning light system in the present invention exposes motorists rearward of the vehicle to at least one flash of the electrically actuated lamp of the vehicle brake light system. Each of the flashes have a duration less than the average reaction time threshold of motorists. In an alternative embodiment, the warning light system of the present invention may be coupled to an electrically actuated lamp which is mounted rearward on the vehicle, and is independent of the vehicle brake light system.

Abstract: A method for maintaining a record of set-creating data processing activities and associated data sets. The method includes the steps of creating and displaying a plurality of visual representations, one for each of the set-creating activities, and arranging the visual representations to indicate a hierarchical relationship within the set-creating activities. The visual representations may be used to select for viewing a particular one of either the set-creating activities or the associated data sets, and displaying them on the data processing system. The display may correspond to a duration of an operator input activity, or to a time interval defined by an initiating operator input at a terminating operator input. In its simplest form, the method requires the arrangement of the visual representations in a hierarchy which corresponds to set-creation chronology.

Abstract: A wellbore is at least partially obstructed with a partition or obstruction member. A fluid slurry of an aggregate mixture of particulate matter is pumped into the wellbore adjacent the partition or obstruction member. The aggregate mixture of particulate material contains at least one component of particulate material, and each of the at least one particulate material components has an average discrete particle dimension different from that of the other particulate material components. Fluid pressure then is applied to the aggregate material and fluid is drained from the aggregate material through a fluid drainage passage in the partition or obstruction member. The fluid pressure and drainage of fluid from the aggregate mixture combined to compact the aggregate mixture into a substantially solid, load-bearing, force-transferring, substantially fluid-impermeable plug member, which seals a first wellbore region from fluid flow communication with a second wellbore region.

Abstract: A method and apparatus is provided for facilitating direct icon manipulation operations in a data processing system. A selection icon is generated which corresponds to an operator's selection of data fields from a plurality of data fields. The selection icon may be applied to a particular category of software objects to automatically include or exclude selected data fields in a direct icon manipulation operation, such as a drag-and-drop operation.

Abstract: A logging-while-drilling system is disclosed which includes a pair of receiving antenna disposed between upper and lower transmitting antenna. The upper and lower transmitting antenna are energized successively to generate an electromagnetic wave which propagates through the formation surrounding the borehole. The amplitude attenuation and phase shift of the electromagnetic wave between the receiving antenna is measured. Measurements from both the upper and lower transmitting antenna can be combined to eliminate by cancellation system error components. In order to further improve the performance of the logging-while-drilling system, separate and dedicated driver circuits are provided proximate each transmitter. In addition, reference signals which are utilized to coordinate and synchronize the operation of the various components of the logging-while-drilling system are provided at frequencies which are substantially different from the interrogation frequency of the electromagnetic interrogation signal.

Abstract: A wellbore tool is provided to perform work in a wellbore by converting a chemical pressure source into a force exerted over a distance. The wellbore tool includes a pressure chamber sealed by a firing head and containing a power charge which includes a plurality of chemical components which are burned in a combustion reaction to generate gas. The combustion reaction of the power charge is initiated by a resistance heater which directly initiates the combustion reaction by receiving electrical energy and generating heat. The combustion reaction generates gas within the pressure chamber, the gas having a pressure which pushes a pressure responsive member into movement relative to the pressure chamber for providing a force over a distance to operate a downhole tool.

Abstract: A method and an apparatus for use in a wellbore are provided to prevent an electrical current from passing between a power supply and an electrically operated downhole well tool until after the electrically operated downhole well tool is positioned downhole within the wellbore. A temperature sensitive member prevents a biased member from moving from a first position to a second position until after the temperature sensitive member has been heated to an activation temperature, at which the temperature sensitive member softens to allow the biased member to move through the temperature sensitive member and to the second position for electrically connecting between the power supply and the electrically operated downhole well tool.