Abstract: Methods and system for implementing Condition Based Maintenance (CBM) of downhole systems and equipment, including drilling tools, wireline tools and production tools is presented in this disclosure. The presented CBM-based approach combines the use of a tool life distribution with a life-stress acceleration model and a time-varying stress model to model failure times of a tool. One or more failure parameters related to operation of the tool during the operational run can be calculated based on a life measure of the tool determined for each step in the series of steps of the operational run, a time duration of each step, and a life duration of the tool at reference levels of stress variables. Maintenance of the tool can be performed based on the calculated failure parameters.

Abstract: Methods and system for implementing Condition Based Maintenance (CBM) of downhole systems and equipment, including drilling tools, wireline tools and production tools is presented in this disclosure. The presented CBM-based approach combines the use of a tool life distribution with a life-stress acceleration model and a cumulative damage model to account for varying stress levels during a tool operation. The CBM methodology presented herein provide for a more effective maintenance system based on direct utilization of field data so that an appropriate maintenance can be performed at an appropriate time, thereby optimizing a frequency of performing maintenance.

Abstract: Methods and system for implementing Condition Based Maintenance (CBM) of downhole systems and equipment, including drilling tools, wireline tools and production tools is presented in this disclosure. The presented CBM-based approach combines the use of a tool life distribution with a life-stress acceleration model and a cumulative damage model to account for varying stress levels during a tool operation. The CBM methodology presented herein provide for a more effective maintenance system based on direct utilization of field data so that an appropriate maintenance can be performed at an appropriate time, thereby optimizing a frequency of performing maintenance.

Abstract: Methods and system for implementing Condition Based Maintenance (CBM) of downhole systems and equipment, including drilling tools, wireline tools and production tools is presented in this disclosure. The presented CBM-based approach combines the use of a tool life distribution with a life-stress acceleration model and a time-varying stress model to model failure times of a tool. One or more failure parameters related to operation of the tool during the operational run can be calculated based on a life measure of the tool determined for each step in the series of steps of the operational run, a time duration of each step, and a life duration of the tool at reference levels of stress variables. Maintenance of the tool can be performed based on the calculated failure parameters.

Abstract: A method for distributing effects of a circumferential hot streak condition in a turbine includes communicating a control signal to a rotator moving a stator ring with the rotator in response to the control signal.

Abstract: First stage nozzle airfoils have internal core profiles substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I wherein X, Y and Z values are in inches. The X and Y values are distances which, when connected by smooth continuing arcs, define internal core profile sections at each radial distance Z. The profile sections at each distance Z are joined smoothly to one another to form a complete internal core profile. The X, Y and Z distances may be scalable as a function of the same constant or number to provide a scaled-up or scaled-down internal core profile. The nominal internal core profile given by the X, Y and Z distances lies within an envelope of ±0.030 inches in directions normal to any internal core surface location.