摘要:
A method is disclosed for locating a receiver in a borehole having a conductive liner by inducing an electromagnetic field from a transmitter in a first borehole, detecting at a first location by at least one receiver located in a second borehole having a conductive liner, a first electromagnetic field induced by the transmitter, detecting at a second location by the at least one receiver, a second electromagnetic field induced by the transmitter and calculating a set of geometry coordinates for the first location based on the first electromagnetic field and the second electromagnetic field.
摘要:
A method is disclosed for locating a receiver in a borehole having a conductive liner by inducing an electromagnetic field from a transmitter in a first borehole, detecting at a first location by at least one receiver located in a second borehole having a conductive liner, a first electromagnetic field induced by the transmitter, detecting at a second location by the at least one receiver, a second electromagnetic field induced by the transmitter and calculating a set of geometry coordinates for the first location based on the first electromagnetic field and the second electromagnetic field.
摘要:
A method is disclosed for locating a receiver in a borehole having a conductive liner by inducing an electromagnetic field from a transmitter in a first borehole, detecting at a first location by at least one receiver located in a second borehole having a conductive liner, a first electromagnetic field induced by the transmitter, detecting at a second location by the at least one receiver, a second electromagnetic field induced by the transmitter and calculating a set of geometry coordinates for the first location based on the first electromagnetic field and the second electromagnetic field.
摘要:
A method for surveying a distribution of chargeability in a volume of earth includes inducing polarization in the volume of earth by applying first and second primary magnetic fields to the volume of earth, with the first and second primary magnetic fields respectively oscillating at a first and second frequencies. First and second secondary magnetic fields emitted by the volume of earth in response to application of the primary magnetic fields are measured, with the first and second frequencies being selected such that the induction number of the volume of earth is less than unity, and, in one example, such that the imaginary portions of the secondary magnetic fields depend approximately linearly upon frequency. Distribution of chargeability can be determined for the volume of earth from a linear combination of the first and second secondary magnetic fields.