Steerable motor system with integrated formation evaluation logging capacity

A steerable motor system with an integrated formation evaluation device for drilling a well or the like below ground level having an uphole portion close to said ground level and a downhole portion disposed distal to said ground level comprising:

• a housing;
• a drive shaft disposed through a portion of said housing, said drive shaft located along the central axis of said housing;
• a downhole motor mounted within said housing, said downhole motor drivingly engaging said drive shaft;
• means for stabilizing said downhole motor being mounted uphole of said bit;
• a resistivity measuring device mounted within said housing between said means for stabilizing said bit and said downhole motor, said formation evaluation device adapted for generating an output signal;
• and
• a surface signaling device adapted for receiving said output signal from said formation evaluation device and relaying said signals to a receiver located above ground level.

The device of claim .6 wherein said formation evaluation device includes:

• transmitting means for transmitting in-phase, equal amplitude reference signals;
• a transmitting antenna normally connected to said transmitting means;
• sensing means for sensing said reference signals;
• a pair of spaced receiving antennas connected to said sensing means;
• and
• microprocessor means for calculating a difference in phase and amplitude between said reference signals received by said receiving antennas.