Universal electric well service rig

A mobile service rig for servicing a wellsite, the wellsite being defined as a circular area of land within which there is a wellhead at a centerpoint of the circular area of land, the wellhead being at an upper end of a wellbore that extends down below the circular area of land, the circular area of land having a 200-foot radius from the centerpoint, the wellsite being further defined as comprising a pumping unit for forcing a fluid up from within the wellbore, the wellsite further comprising a wire, the pumping unit being selectively activated and deactivated, the pumping unit being energized by an electrical power grid via the wire when the pumping unit is activated to pump the fluid up through the wellbore, the pumping unit being inactive when the pumping unit is deactivated, the mobile service rig being operable selectively in a travel mode for traveling, a wellstring pulling mode for pulling a wellstring up from within the wellbore, a wellstring insertion mode for lowering the wellstring down into the wellbore, and a setup mode;

• the setup mode being when the pumping unit is deactivated while the mobile service rig is within the circular area of land but disconnected from the wellstring in the wellbore, the mobile service rig comprising:
• a chassis apparatus;
• a set of wheels connected to the chassis apparatus to support the chassis apparatus in a traveling motion during the travel mode;
• a hoist drum supported by the chassis apparatus, the hoist drum being operable to selectively raise and lower the wellstring during the wellstring pulling mode and the wellstring insertion mode, respectively;
• a first electric motor being coupled to rotate the hoist drum at least sometimes during the wellstring pulling mode;
• a rechargeable electric power storage system supported by the chassis apparatus, the rechargeable electric power storage system being effectively connected to supply an electrical energy to the first electric motor during the wellstring pulling mode, the rechargeable electric power storage system comprising a first battery bank and a second battery bank wherein only one of the first battery bank and the second battery bank can supply the electrical energy to the first electric motor at any given time during the wellstring pulling mode, and at least sometimes the electrical power grid helps recharge the first battery bank while the second battery bank supplies the electrical energy to the first electric motor during the wellstring pulling mode;
• and
• an electrical cable being effectively connected to the wire of the wellsite to help recharge the rechargeable electric power storage system via the electrical power grid at least sometimes during at least one of the setup mode, the wellstring pulling mode, and the wellstring insertion mode;
• the electrical cable being disconnected from at least one of the wellsite and the rechargeable electric power storage system during the travel mode.

A mobile service rig for servicing a wellsite, the wellsite being defined as a circular area of land within which there is a wellhead at a centerpoint of the circular area of land, the wellhead being at an upper end of a wellbore that extends down below the circular area of land, the circular area of land having a 200-foot radius from the centerpoint, the wellsite being further defined as comprising a pumping unit for forcing a fluid up from within the wellbore, the wellsite further comprising a wire, the pumping unit being selectively activated and deactivated, the pumping unit being energized by an electrical power grid via the wire when the pumping unit is activated to pump the fluid up through the wellbore, the pumping unit being inactive when the pumping unit is deactivated, the mobile service rig being operable selectively in a travel mode for traveling, a wellstring pulling mode for pulling a wellstring up from within the wellbore, a wellstring insertion mode for lowering the wellstring down into the wellbore, and a setup mode;

• the setup mode being when the pumping unit is deactivated while the mobile service rig is within the circular area of land but disconnected from the wellstring in the wellbore, the mobile service rig comprising:
• a chassis apparatus;
• a set of wheels connected to the chassis apparatus to support the chassis apparatus in a traveling motion during the travel mode;
• a hoist drum supported by the chassis apparatus, the hoist drum being operable to selectively raise and lower the wellstring during the wellstring pulling mode and the wellstring insertion mode, respectively;
• a first electric motor being coupled to rotate the hoist drum at least sometimes during the wellstring pulling mode;
• a rechargeable electric power storage system supported by the chassis apparatus, the rechargeable electric power storage system being effectively connected to supply electrical energy to the first electric motor during the wellstring pulling mode;
• an electrical cable being effectively connected to the wire of the wellsite to help recharge the rechargeable electric power storage system via the electrical power grid at least sometimes during at least one of the setup mode, the wellstring pulling mode, and the wellstring insertion mode;
• the electrical cable being disconnected from at least one of the wellsite and the rechargeable electric power storage system during the travel mode;
• and
• an auxiliary braking generator being effectively connected to help recharge the rechargeable electric power storage system, the auxiliary braking generator being coupled to and rotated by the hoist drum to slow a descent of the wellstring during the wellstring insertion mode.