Magnet ranging calculation method of twin parallel horizontal wells steerable drilling

Key words:  well drilling  twin parallel horizontal wells  rotating magnet ranging service system  magnetic dipole  adjacent well distance

Abstract:

The operating principle of rotating magnet ranging service system for drilling twin parallel horizontal wells was introduced. The rotating magnetic sub was characterized by a rotating magnetic dipole, and the far magnetic field distribution of the rotating magnetic sub was deduced. According to the far magnetic field distribution of rotating magnetic sub, the conclusion that the distance between the two axial field amplitude maxima equals the separation between the twin parallel horizontal wells was demonstrated, and the calculation method for determining the direction from one well of twin parallel horizontal wells to another was obtained as a function of the magnetic signals sensed by probe. According to the ranging calculation method, the rotating magnet ranging service system can be used to drill a well being drilled on a precise predetermined path, which is parallel to an existing well.