Shaanxi Yanchang Petroleum UPS Project: Industrial Case for Extreme Oilfield Environments

Ⅰ. Project Overview

1. Enterprise Background
   • Shaanxi Yanchang Petroleum Material Group, a wholly-owned subsidiary of Shaanxi Yanchang Petroleum (Group), is responsible for material procurement, supply chain management, and energy chemical equipment integration. As the largest energy and chemical comprehensive service provider in Northwest China, it achieved over 80 billion RMB in revenue in 2024, covering the entire industrial chain of oil and gas exploration, refining, and storage.
2. Project Requirements
   • Extreme Environments: In the 929 Project of the Exploration Company, challenges include extreme temperatures, high dust, and corrosive gases in northern Shaanxi oilfields.
   • Power Quality: Variable frequency drives on drilling platforms cause a THDi of 7.5%, threatening PLC control accuracy.
   • Safety Standards: Requires compliance with Class I load power supply standards of Code for Design of Petrochemical Enterprises with ≥30-minute backup for critical equipment.

Ⅱ. Core Challenges

1. Power Quality & Reliability
   • High Inrush Current: Mud pump startups generate 12x rated current, risking UPS overload.
   • Harmonic Interference: THDi of 7.5% affects relay protection device accuracy.
2. O&M Challenges
   • Decentralized Systems: Scattered UPS deployment leads to >4-hour fault response times.
   • High Battery Costs: Annual lead-acid battery replacement costs exceed 6 million RMB.
3. Energy Efficiency
   • Low UPS Efficiency: 82% efficiency results in annual electricity costs of 120 million RMB.
   • Carbon Reduction Targets: Must meet Shaanxi’s 18% energy consumption reduction goal per unit of output value.

Ⅲ. Solutions

1. Technical Architecture

2. Implementation Strategy
   • Explosion-proof cabinets with temperature control systems.
   • Modular deployment with 50% expansion capacity.
   • Integration with energy management platform for remote battery state of health (SOH) monitoring.

Ⅳ. Project Achievements

1. Reliability Improvements
   • System availability: 99%, annual unplanned downtime <5 minutes.
   • Fault response time reduced by 80%, MTTR ≤20 minutes.
2. Energy & Cost Savings
   • THDi reduced from 7.5% to 2%, saving 18 million RMB annually in electricity costs.
   • Lithium iron phosphate batteries (12,000 cycles) reduce annual maintenance costs by 75%.