Method and means for transmitting data through a drill string in a borehole

摘要

Data are transmitted through a column of drilling mud in a drill string that is being used in drilling a borehole in an underground formation. The data are in the form of pressure waves (such as pressure pulses) and are generated by means of a downhole mud motor that is driven by the drilling mud. The pressure waves are generated by varying the load on the mud motor according to a predetermined pattern that is representative of the data to be transmitted.