Research on extremely low frequency electromagnetic wave model and simulation in wellbore communication.

Area of Science:

• Electrical Engineering
• Geophysics
• Wireless Communication

Background:

• Increasing digitalization in oil wellbores demands advanced wireless communication technologies.
• Traditional wired methods (cables, optical fibers) face limitations in construction, data interpretation, and cost.
• Extremely low frequency (ELF) electromagnetic waves offer potential for long-distance, high-penetration wellbore communication.

Purpose of the Study:

• To develop and validate a model for ELF electromagnetic wave propagation in wellbore environments.
• To determine the optimal transmitting frequency for ELF wellbore communication.
• To assess the feasibility and reliability of ELF electromagnetic waves for wireless wellbore communication.

Main Methods:

• Established a polygonal multiple-delays uncertainty coupled complex network model for ELF wave propagation.
• Designed a controller to analyze magnetic and electric field intensities and propagation characteristics.
• Conducted field experiments to verify communication range and simulation experiments for field distribution and coupling.

Main Results:

• Identified 12.7 Hz as the optimal transmitting frequency for ELF electromagnetic waves.
• Field experiments confirmed reliable wireless wellbore communication up to 1500 m without relays.
• Analyzed the impact of casing thread deformation and explored frequency effects on signal propagation efficiency.

Conclusions:

• The developed model accurately describes ELF electromagnetic wave propagation in wellbore conditions.
• ELF electromagnetic waves provide a reliable and continuous solution for wireless wellbore communication.
• This research offers a theoretical basis and demonstrates feasibility for practical engineering applications in the oil industry.