#708 bytes idm serial key software

Kalman filter theory provides a convenient formulation for generation of a minimum variance estimate of the state vector of a linear system. Such aiding may take the form of an external position or velocity measurement which is compared to the position or velocity indicated by the navigator. Inertial systems are routinely aided using external data from a number of sources. Techniques to improve accuracy are, in general, based on the fact moreВ В» that the dynamics associated with the propagation of the navigator errors are very well known. The application of inertial navigation system (INS) of suitable size and cost for this type of application is not inherently accurate enough to offer significant improvements in well-surveying accuracy. Among the factors contributing to this need are closed interspacing of wells particularly from offshore platforms, deeper and more highly deviated wells, smaller target formations and the requirement for rapid drilling of relief wells in the case of blowouts. There is an increasing need for higher accuracy in wellbore directional and positional surveying than is currently available using conventional techniques.

#708 bytes idm serial key software

The hardware and software associated with this mapping system are described and the recent field test results are reported. Also this system provides continuous data throughout the wellbore and logging speeds on the order of 10 ft/sec appear possible. Unlike conventional systems, the inertial navigator does not require any sort of projection of the cable length (which may not be accurately known). Test results show that the new system is accurate to about +- 1 foot per 1000 feet of well depth. Present mapping systems have an X-Y-Z location accuracy of +- 100 to +- 200 feet for a typical well depth of 10,000 feet. This procedure, known as Kalman filtering, results in increased accuracy of the data. Measurement errors are determined by periodically stopping the tool during the logging procedure and observing the indicated velocity measurements. The software uses statistical sampling estimation to obtain optimal estimates of the system errors. System accuracy is enhanced by advances made in the computer software which processes the data received from the moreВ В» tool.

A conventional 7-conductor wireline is used for the system data transmission. Double integration of the accelerometer data provides the position information. The gyroscope and accelerometer outputs are transmitted to a computer at the surface which calculates probe attitude relative to north, east, and vertical. The hardware consists of a single-gimbaled inertial platform with accelerometers and gyros to obtain three-axis motion information. В«В lessДЄ phototype wireline tool which includes a downhole inertial platform and a surface computer to spatially map a well is described. Also, this system provides continuous data throughout the wellbore and logging speeds on the order of 10 ft/sec appear possible. Test results show that the new system is accurate to about 1 foot per 1000 feet of well depth. Present mapping systems have an X-Y-Z location accuracy of 100 to 200 feet for a typical well depth of 10,000 feet.

The hardware consists of a single-gimballed inertial platform with accelerometers and gyros to obtain three-axis motion information. A prototype wireline tool which includes a downhole inertial platform and a surface computer to spatially map a well is described.