High temperature drilling with lower temperature rated tools

摘要

A method of maintaining a desired temperature at a location in a well can include adjusting fluid circulation parameters, thereby reducing a difference between an actual temperature at the location and the desired temperature. A well system can include at least one sensor, an output of the sensor being used for determining a temperature at a location in a well, and a hydraulics model which determines a desired change in fluid circulation through the well, in response to the temperature at the location being different from a desired temperature at the location. Another method of maintaining a desired temperature at a location in a well can include adjusting a density, solids content and/or flow rate of a fluid circulated through the well, thereby urging a temperature at the location toward the desired temperature.

主权项

1. A method of achieving a desired temperature of a bottom hole assembly in a well being drilled with drilling fluid having a density, a solids content, and a flow rate, the method comprising:
measuring a temperature of the bottom hole assembly; determining whether to adjust any one or more of the density, the solids content, and the flow rate of the drilling fluid with a hydraulics model based on parameters including the desired temperature, the measured temperature, the density, the solids content, and the flow rate to achieve the desired temperature; and adjusting any one or more of the density, the solids content, and the flow rate of the drilling fluid based on the hydraulics model to achieve the desired temperature of the bottom hole assembly, while maintaining a desired pressure in the well.