Small hole well logging sonde and system with transmitter and receiver assemblies

摘要

A well logging sonde has an outer diameter of 1-11/16 inches or less and includes a transmitter coil and at least two receiver coils. The coils are contained in a coil housing. A transmitter circuit provides a signal for energizing the transmitter coil to develop an electromagnetic field in an earth formation. A transmitter case contains the transmitter circuit and is mechanically connected to the coil housing so that the transmitter provides the signal to the transmitter coil which develops the corresponding electromagnetic field in the earth formation. A receiver circuit receives signals from the receiver coils resulting from the reception of electromagnetic energy from the electromagnetic field after passage through the earth formation. The receiver circuit provides a signal representative of at least one characteristic of the earth formation in accordance with the signals from the receiver coils. The receiver circuit is housed in a receiver case which is mechanically connected to the coil housing in a manner so that the receiver coils provide their signals to the receiver means. A cable connector is mechanically connected to a well logging cable so as to electrically connect the receiver circuit to at least one conductor in the well logging cable.