Drilling bottom hole assembly having wireless power and data connection

摘要

A bottom hole assembly (BHA) configured for use in a drill string of a wellsite drilling system. The BHA includes a measuring-while-drilling (MWD) module, a wireless power and data connection, and a rotary steerable system (RSS). The MWD module is configured for coupling to a drill string, and includes a power generation component and a direction and inclination (D&I) survey package. The wireless power and data connection is disposed above a drilling motor in the drill string and for providing power and data connectivity between the MWD module and the drilling motor. The RSS is coupled to the drilling motor for receiving power from and communicating with the MWD module via the wireless power and data connection and the drilling motor.

主权项

1. A method for providing wireless power and data communications in a bottom hole assembly for use in a drill string, the method comprising:
coupling a measuring-while-drilling (MWD) module to a drill string; locating a wireless power and data connection above a drilling motor in the drilling string, the wireless power and data connection for providing power and data between the MWD module and the drilling motor; and coupling a rotary steerable system (RSS) to the drilling motor for receiving power from and communicating with the MWD module via the wireless power and data connection; electrically coupling first and second coils in the wireless power and data connection with a coupling coefficient, k, wherein, k=M/√{square root over (L1L2)}≦0.9, M is a mutual inductance between the first and second coils, L1 is a first self-inductance of the first coil, and L2 is a second self-inductance of the second coil; and resonantly tuning the first coil at a first frequency, f1, with a first capacitance, C1, and the second coil at a second frequency, f2, with a second capacitance, C2, wherein f1 is approximately equal to f2,f1=12⁢π⁢L1⁢C1⁢⁢and⁢⁢f2=12⁢π⁢L2⁢C2; wherein the first and second coils have a figure of merit, U, wherein U=k√{square root over (Q1Q2)}≧3,Q1=2⁢π⁢⁢f1⁢L1R1,Q2=2⁢⁢π⁢⁢f2⁢L2R2,Q1 and Q2 comprise respective quality factors associated with the first and second coils, and R1 and R2 comprise respective resistances of the first and second coils.