Abstract: A downhole relative positioning system utilizes electromagnetic and survey measurements from a first well to calibrate a formation model, which is then used to improve the interpretation of measurements from a second well. Since the methods described herein utilize a differential approach, even though the exact position of each wellbore may not be accurately identified, their relative positions can be accurately identified.

Abstract: A magnetic ranging system utilizes the natural shape of magnetic fields for steering and/or landing of one wellbore in relation to another wellbore.

Abstract: A downhole relative positioning system utilizes electromagnetic and survey measurements from a first well to calibrate a formation model, which is then used to improve the interpretation of measurements from a second well. Since the methods described herein utilize a differential approach, even though the exact position of each wellbore may not be accurately identified, their relative positions can be accurately identified.

Abstract: An artificial toolface reference system includes a power supply providing current to a ground lead and a reference lead. A ground point is coupled to the ground lead and in electrical connection with the ground. A reference wellbore includes a reference conductor in electrical connection with the ground. The reference conductor is in electrical connection with the reference lead. A guidance sensor positioned outside the reference wellbore includes at least one magnetometer. The power supply may be used to provide a current through the reference conductor, the ground, and the ground point such that a reference magnetic field is generated along the reference conductor. The guidance sensor may measure the reference magnetic field with a magnetometer. An artificial magnetic toolface may be calculated therefrom.

Abstract: A magnetic ranging system utilizes the natural shape of magnetic fields for steering and/or landing of one wellbore in relation to another wellbore.

Abstract: A method of measuring the temperature in a wellbore may include positioning a conductor within the wellbore where the conductor has a temperature-dependent resistivity. By measuring the resistance of the conductor, the temperature of the wellbore may be determined. The conductor may be coupled to a power supply by a wireline. The resistivity of the wireline may be measured or calibrated for changes in its resistivity in response to wellbore temperature.

Abstract: An artificial toolface reference system includes a power supply providing current to a ground lead and a reference lead. A ground point is coupled to the ground lead and in electrical connection with the ground. A reference wellbore includes a reference conductor in electrical connection with the ground. The reference conductor is in electrical connection with the reference lead. A guidance sensor positioned outside the reference wellbore includes at least one magnetometer. The power supply may be used to provide a current through the reference conductor, the ground, and the ground point such that a reference magnetic field is generated along the reference conductor. The guidance sensor may measure the reference magnetic field with a magnetometer. An artificial magnetic toolface may be calculated therefrom.