US Patent 11674365 Battery shuttle for electric well service rigs

A battery shuttle method uses a portable battery shuttle for delivering backup power to an electric well service rig operating in a well field that includes multiple wells. The electric well service rig has a rechargeable rig power pack for powering the rig's electric hoist. The electric hoist is used for removing and installing a wellstring within a chosen well. The battery shuttle has a rechargeable shuttle power pack for recharging the rig power pack when needed. The battery shuttle can travel back and forth between the electric well service rig and a charging station. The charging station is used for recharging the shuttle power pack.