Automatic remote measurement and control system for downhole parameters in deep well drilling

Abstract:

Drilling parameters and operations are often guided by data shown at surface devices during drilling process. However， some of these data are different from real downhole parameters. The deeper the borehole， the bigger the difference; and it is true with deep drilling， particularly super deep drilling. As a result， it will influence improvement of technical and economical indexes of well drilling. Here we introduce the research results from Russian peers who deeply investigated on remote measurement and automatic control system of borehole bottom parameters such as drilling fluid pressure， azimuth， inclination， axial weight on bit. They also proposed some frameworks on how to perform these measurements and control operations. In China， deep earth exploration strategy has been initiated and a 13000m ultra-deep well is under planning. The design approach and execution plan for these systems discussed here can provide beneficial reference for downhole parameter measurement and automatic control during super deep well drilling of China in the near future.

Key words:deep drilling; drilling process; downhole parameters; device at surface; automatic control system; technical and economical index