HYDRAULIC CONTROL DEVICE FOR TRANSMITTING MEASURING VALUES FROM THE BOTTOM OF A WELL TO THE SURFACE AS PRESSURE PULSES THROUGH THE DRILLING MUD

摘要

Device for transmitting information with respect to measuring values of parameters of a drilling operation from the bottom of the well to the surface in the form of pressure pulses through the mud stream comprising flow limiting means in the path of said stream controlled by electric signals derived from the measured values of said parameters, hydraulic power-accumulator means storing under pressure a control fluid forced therein by pump means energized by a bottom turbine driven by the mud stream and releasing said pressurized fluid through said control means in response to said electric signals, and surface means for sensing said pressure pulses and converting the same to electric values representative of the measured values of said parameters.