Method and Apparatus for Communicating Incremental Depth and/or Other Useful Data of a Downhole Tool

摘要

A method and apparatus for communicating incremental depth and/or other useful data of a downhole tool. The incremental depth and/or other useful data of the downhole tool being communicated by measuring at least one change in the downhole system, detecting the change downhole, and subsequently determining the incremental depth and/or other useful data of the downhole tool.

主权项

1. A method of drilling a borehole with a downhole assembly, the method comprising:
storing in the downhole assembly at least one predetermined depth interval; detecting, using an angular rate sensor of the downhole assembly, changes from different rotational rates imparted to the downhole assembly; determining, using processing circuitry of the downhole assembly, a downhole depth value for the downhole assembly based on the detected changes in the different rotational rates correlated to the at least one predetermined depth interval stored in the downhole assembly; and controlling an operation of the downhole assembly based on the determined depth value.