Mobile Service Rig Electric Power Storage System
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Solution Overview
Problem
Mobile service rigs for wellbore servicing rely heavily on large internal combustion engines, which are inefficient and energy-intensive, especially when the pumpjack or ESP is deactivated, leading to unnecessary energy consumption.
Innovation Solution
Equipping mobile service rigs with a rechargeable electric power storage system that taps into the electrical power source of the pumpjack or ESP when it is inactive, allowing the rig to operate without heavy reliance on diesel engines by using the available electrical power for its operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large internal combustion engine is used to power the mobile service rig, then the rig has sufficient power for wellbore servicing operations, but energy consumption and operational costs increase significantly
Solution Approach 1:
The patent combines the mobile service rig's power system with the wellsite pumpjack or ESP electrical power source. The rig's electrical system is merged with the existing wellsite electrical infrastructure, allowing the rig to draw power from the pumpjack/ESP when they are deactivated. This merging eliminates the need for a separate large internal combustion engine while maintaining sufficient power availability for rig operations.
Solution Approach 2:
The electrical power source at the wellsite (pumpjack or ESP motor) is designed to serve dual purposes: powering the pumping operations during production and powering the mobile service rig during maintenance operations. This multi-functionality allows the same electrical infrastructure to support both production and servicing needs, eliminating the requirement for dedicated rig engine power.
2Adaptability or versatility
If a large internal combustion engine is used to power the mobile service rig, then the rig can operate independently, but operational costs and environmental impact increase
Solution Approach 1:
The wellsite electrical system serves itself by providing power to the mobile service rig during servicing operations. When the pumpjack or ESP is deactivated, its motor becomes a power source for the rig, eliminating the need for the rig to bring its own large internal combustion engine. This self-service approach reduces energy waste by utilizing already-present electrical infrastructure rather than introducing additional energy-consuming equipment.
3Power
If the diesel engine is used continuously to power the mobile service rig, then power availability is maintained, but unnecessary energy consumption occurs when the pumpjack or ESP is deactivated
Solution Approach 1:
The system operates in periodic cycles where the pumpjack or ESP alternates between active pumping mode and deactivated mode. During deactivated periods, the electrical power from the pumpjack/ESP motor is redirected to power the mobile service rig. This periodic switching optimizes energy usage by ensuring the rig only draws power when the pumpjack/ESP is not actively pumping, eliminating unnecessary energy consumption while maintaining continuous power availability for rig operations.
Data Source
AI summary
A mobile service rig includes an onboard rechargeable electric power storage system (e.g., a battery, supercapacitor, etc.) for powering the rig's hoist and other equipment used for repairing or servicing a well at a wellsite. In some examples, the rechargeable electric power storage system is recharged by an electrical power grid that is normally used for powering a pumping unit at the well. Some examples of the mobile service rig include a diesel powered charging generator for backup power. In some examples, an auxiliary braking generator coupled to the rig's hoist provides regenerative braking to help recharge the electric power storage system. Some examples of the mobile service rig comprise a trailer hitched to a diesel powered tractor.