Abstract: A wireline telemetry system and method of transmitting data on multiple carrier frequencies. The system and method adjust power level and number of bits-per-carrier to optimally or near-optimally utilize the capacity of the wireline cable. Due to the nature of wireline telemetry the overall power level is restricted only by the output capability of the downhole telemetry cartridge and the input power restrictions of the uphole telemetry unit receiver. The optimal power level is determined during a training sequence and is a function of such factors as cable length, cable material, cable temperature and cable geometry. The uplink and downlink transmission are executed using different modulation techniques.

Abstract: A system (150) for controlling voltage supplied to a transmission line system. System (150) includes a transmission cable (134) having a characteristic impedance and a load impedance connected at its distal end. A power source (154) is connected to transmission cable (134). Power source (154) is configured to receive a voltage signal input (157) and to drive a source voltage VS based thereon. A feedback unit (155) is configured to receive the power source current (IS) as an input and further configured to generate a feedback voltage (VF) that varies with IS. A set voltage unit (152) is configured to produce a substantially constant voltage (Vset) and an adder (153) is configured to add the set voltage (Vset) to the feedback voltage to generate the voltage signal (157) that provides the input to power source (154). The feedback unit (155) may include an impedance element (156) comprising a digital signal processor or other suitable circuit that models the short circuit impedance of the transmission line.

Abstract: A smart card which includes a non-volatile read/write memory, a resolve buffer, a processor connected to the memory and the resolve buffer, and an installer module configured to cause the processor to receive computer code having unresolved references into the memory, and further configured to cause the processor to perform a method for resolving unresolved references. The method including steps for copying the contents of the memory into the resolve buffer, detecting unresolved references in the computer code, determining the resolved reference for each of the detected unresolved references, updating the contents of the resolve buffer with the resolved references, and replacing the contents of the memory with the contents of the resolve buffer.

Abstract: A method and apparatus for estimating sample timing error in discrete multitone modulated signals. An unprocessed measured tone. The phase of the selected measured tone is adjusted using an average phase error. A normalized phase error for the selected measured tone is estimated. The average phase error is updated with the estimated phase error.

Abstract: A well-log display (160) having a principle axis (135) matched to a deviation of a section of a well-bore (450) is disclosed. By presenting a well-log (160) at about the same angle as the section of the well-bore under consideration, a person viewing the well-log (160) will have the advantage of easily visualizing the inclination of the well-bore (450) to aid in geo-steering, proper interpretation of well-bore measurements, etc. Such a well-log (160) may be presented as a hardcopy or as an interactive display on a computer screen (642). A presentation (100, 200) of a well-log (160) may include more than just the log itself, for example, a reference diagram (100, 200) of the entire well highlighting (130) or otherwise indicating the part of the well currently being displayed in the well-log.

Abstract: A method for aligning measurements of a hostile environment includes synchronizing at least two clocks, wherein at least a first clock is in the hostile environment, measuring characteristics of the hostile environment, aligning time domain curves of the collected measurements, correlating the curves using one or more events recorded by each clock, and correcting the curves by adding one or more time offsets. The offsets may be added to a found resent event or at other locations on the time domain curve. A second clock may be located outside the hostile environment or within a same or similar hostile environment. The collecting the measurements may be taken by a first measurement tool in a first device near the first clock and in at least a second device coupled to a second clock.

Abstract: The disclosure describes a system and method for dynamically matching a source impedance to a load impedance or the complex conjugate of the load impedance. An embodiment of the present invention is a device for active impedance matching comprising a current driver having an output connected to a load, means for detecting an output voltage from the current driver to the load, means for scaling the detected output voltage by a scaling value, and means for subtracting a value representing the scaled detected output current from an input signal of the voltage driver.

Abstract: A multi-application smart card has a persistent storage unit. The persistent storage unit stores data and/or information that indicates which application is to be run the next time the smart card is inserted into a terminal. The persistent storage unit may indicate the same application, a different user-selected application, or an application-selection application is to be run next. Alternatively, the persistent storage unit may indicate the next application on a predefined list as the application to be run next. An application-selection terminal allows a user to manually select the user-selected application. The terminal may initiate communication with the smart card by sending a special, predefined signal to the smart card.

Abstract: A method and apparatus is disclosed for communicating with a host. In one embodiment, a smart card has an IC with voltage conditioning circuitry and a pull-up resistor. The smart card, when inserted in a smart card reader coupled to the host, is capable of signaling the host over a bus using the pull-up resistor selectively coupled to a voltage output of the voltage conditioning circuitry and a first output of the smart card. The voltage conditioning circuitry output is selectively coupled to the first output through the resistor, responsive to the device being powered by the bus but not transmitting. This tends to pull up the first output to the voltage level of the voltage source, which makes the smart card capable of being properly detected by the host upon the bus being driven by a host. Selectively disconnecting the pull-up resistor while the smart card is transmitting or receiving results in a more balanced differential output signal.

Abstract: A system (150) for controlling voltage supplied to a transmission line system. System (150) includes a transmission cable (134) having a characteristic impedance and a load impedance connected at its distal end. A power source (154) is connected to transmission cable (134). Power source (154) is configured to receive a voltage signal input (157) and to drive a source voltage VS based thereon. A feedback unit (155) is configured to receive the power source current (IS) as an input and further configured to generate a feedback voltage (VF) that varies with IS. A set voltage unit (152) is configured to produce a substantially constant voltage (Vset) and an adder (153) is configured to add the set voltage (Vset) to the feedback voltage to generate the voltage signal (157) that provides the input to power source (154). The feedback unit (155) may include an impedance element (156) comprising a digital signal processor or other suitable circuit that models the short circuit impedance of the transmission line.

Abstract: The present invention comprises a data delivery system for delivering oilfield data from an acquisition site to a remote delivery site comprising a central data hub computer that processes a workflow order for controlling delivery of the oilfield data, a data acquisition site computer that transmits oilfield data over a first communications network to the central data hub in near real-time in response to the workflow order and a data server that receives data from the central data hub over a second communications network. The data server communicates with multiple remote delivery site computers for the simultaneous display of oilfield data in near real-time at the multiple delivery site computers in response to the workflow order.

Abstract: A method, computer system and article of manufacture for visualizing a model including a first surface is disclosed. The method includes determining, as the model is being built, the rendering resolution of a portion of the first surface based on a view frustum from which the first surface is to be viewed and rendering the portion of the first surface on the output device using the rendering resolution. The vertices and edges to be rendered are selected based on the view frustum, using view frustum culling and bounding sphere projection. The vertices and edges selected to be rendered are tessellated using incremental and decremental tessellation. The tessellated vertices and edges are rendered. Predictive techniques are used to estimate future view frustums. Quality may be traded off against performance by adjusting parameters. Material properties are represented.

Abstract: A method, computer system and computer program are disclosed for representing a first surface at multiple levels of resolution. The first surface is partitioned into nodes with one or more boundaries, each level of resolution having a subset of the boundaries. A second surface may be classified against the first surface. Surfaces and the model may be decimated. Portions of the surfaces may be loaded from persistent memory on demand and removed when no longer required.

Abstract: An integrated circuit card is used with a terminal. The integrated circuit card includes a memory that stores an interpreter and an application that has a high level programming language format. A processor of the card is configured to use the interpreter to interpret the application for execution and to use a communicator of the card to communicate with the terminal.

Abstract: A smart card for use in connection with execution of a software program by a computer includes a microcontroller configured by a program stored in a smart card memory to verify information received from the computer during execution of the software program. The microcontroller is further configured to cause a signal to be stored in the smart card memory which is indicative of whether execution of the software program is certified as valid based on results of verifying the received information. Methods of using the smart card are also disclosed.

Abstract: A method for efficiently and accurately producing filter coefficients for wavefield extrapolation which is particularly useful for migrating seismic data using a multiprocessor parallel computer as provided. In 3D seismic migration, the techniques have been developed for 3D processing using 1D extrapolation filters. The present invention uses a Remez-type approximation for developing such extrapolation filters which increases image quality or reduces processing time, or both. Additionally, the method provides an automated method for producing such extrapolation filters which is particularly useful in parallel seismic migration because of the large number of extrapolation filters which must be produced. The automated method of generating filters sets a frequency transition band where the amplitude is specified to be monotonically decreasing which insures stable filter design.

Abstract: A method, computer system, and computer program for analyzing geological data sampled from a subsurface region and an analysis of the geological data stored in a geoscience model on a magnetic media, including building a simulation input model from the geoscience model. Data is acquired and interpreted to produce a geoscience model. A boundary is constructed for dividing the region into a first sub-region and a second sub-region; storing on the magnetic media the shape of the boundary as a parametric function whose parameter density can vary. A subsurface region divided into sub-regions, in each of which a material property varies without discontinuities.

Abstract: A method, computer system or computer program for interactively constructing, editing, rendering and manipulating geoscience models including aggregating the functionality of a geometry system and a graphics system, enforcing consistency between the geometry system and the graphics system, and interfacing the geometry system and the graphics system to an application through an integration layer.

Abstract: A system and method for optimizing logistical operations in land seismic surveys. The system and method for modeling and optimizing logistical operations problems in land seismic survey operations is implemented in a computer program running on a computer processor. A logistical problem is formulated with a set of decision variables and problem data and the problem is modeled as an objective function and a set of constraints, expressed in terms of the problem data and the decision variables. The objective function is solved subject to the constraints and an optimal solution is generated for the set of decision variables to optimize the logistical problem.

Abstract: A method and apparatus for transmitting and receiving acquired digital data over bandpass channels (i.e. channels having a limited range of frequencies) at high data transmission rates. Combined amplitude and phase modulation (quadrature amplitude modulation) is applied to the digital data and the sampled digital waveform converted to an analog waveform for passage over the bandpass channel. The sample rate is chosen as an integer multiple of the symbol rate and carrier frequency to significantly reduce processing overhead. Reception of the acquired data is similar to transmission and involves an analogous amplitude and phase demodulation. The quadrature amplitude modulation technique of the present invention is applied to an oil well-logging application to transmit the data acquired from the downhole logging instruments over the logging cable (bandpass channel) at high transmission rates.