Puguang Gas Field is the core gas source of China’s “Sichuan-to-East Gas Transmission Project”. It is a strategic gas field for the Yangtze River Economic Belt’s energy and chemical raw material security. However, its extreme conditions—high sulfur, deep reservoirs, and multiphase flow—set strict demands for drainage gas recovery equipment: “sulfur resistance, efficiency, safety, adaptability”.
Based on Puguang Gas Field’s actual needs and the Vigorous device’s traits (integrating twin-screw pump tech), this paper analyzes the device’s application feasibility. It does so from five dimensions: working condition adaptability, technical support, safety compliance, economic rationality, and environmental adaptability. It provides a basis to solve the gas field’s liquid accumulation and boost development benefits.
I. Analysis Background: Puguang Gas Field’s Status and Core Pain Points
1. Strategic Value and Development Needs
Puguang Gas Field is in Dazhou, Sichuan. It is an ultra-large marine high-sulfur gas field with a 5,000-meter reservoir depth.
Cumulatively, it has produced over 115.5 billion cubic meters of natural gas. It accounts for 1/3 of China’s annual sulfur output. It directly supports the “Sichuan-to-East Gas Transmission Pipeline”. The pipeline supplies 80 cities and nearly 200 million people with clean energy.
Now the gas field is in the middle and late development stages. It needs efficient drainage tech to:
- Revitalize 9 flooded, shut-in wells
- Optimize 10 liquid-carrying production wells (230 m³ daily water output)
- Avoid 2+ million m³ daily production loss
- Ensure stable pipeline gas supply
2. Core Working Condition Pain Points (Feasibility Premise)
| Working Condition Category | Specific Characteristics | Core Equipment Requirements |
| Corrosive Environment | H₂S: 10%-20%, CO₂: 8%, pressure: 56MPa | Strong sulfur resistance; component life ≥1 year |
| Liquid Accumulation & Multiphase Flow | Liquid buildup raises wellbore backpressure; GVF fluctuates 0-100% | Wide-condition gas-liquid transport; negative pressure to cut backpressure |
| Safety Management | Toxic H₂S (well shutdown if >100ppm at 100m) | Zero-leakage sealing; auto-protection for abnormalities |
| Terrain & Operation | Mountainous terrain; “well factory” mode | Skid-mounted, small footprint; supports unattended operation |
| Environmental Requirements | Sichuan “Environmental Integrity Enterprise”; strict SO₂ control | Low energy use; less indirect carbon emissions |
II. Core Feasibility Analysis
1. Working Condition Adaptability: Matching High-Sulfur Multiphase Flow
Puguang Gas Field’s core issues: high-sulfur corrosion, severe GVF fluctuation, mountainous deployment limits. The Vigorous device covers all conditions via targeted design.
1.1 Sulfur Resistance Adaptability
Core parts (pump body, bushing, screw) use 2205 duplex stainless steel + tungsten carbide spraying. 2205 steel has 22% chromium and 5% nickel. It resists pitting well. In 15% H₂S, its corrosion rate is 1/20 of ordinary stainless steel. This far meets the “≥1 year component life” rule.
1.2 Multiphase Flow Adaptability
It integrates twin-screw multiphase pump and compressor tech. No external separation equipment is needed. It runs stably at 0-100% GVF. Minimum inlet pressure is -0.09MPa. It drains wellbore liquid and cuts backpressure. It adapts to fluctuating liquid and frequent gas-liquid transport.
1.3 Terrain Adaptability
Compact skid design cuts footprint by 60% vs. traditional gear. Weight is 50% lighter. It deploys flexibly in mountainous well sites. It fits “well factory” space needs.
2. Technical Feasibility: Mature Tech and Verified Performance
The Vigorous device’s design solves traditional drainage process flaws in Puguang Gas Field.
2.1 Integrated Process Breaks Traditional Limits
Traditional processes need “separation + pressurization” gear. For example, continuous gas lift requires pipe string work. Foam drainage uses lots of chemicals. The Vigorous device combines gas-liquid transport and pressurization. It has a built-in circulating liquid system and patented profile. It keeps ≥90% volumetric efficiency. It seals reliably even with low liquid. It avoids “efficiency drops in GVF fluctuation”.
2.2 Verified Key Component Performance
Mechanical seal uses “double-end cartridge + Plan54 external flushing”. It injects clean medium into the isolation chamber nonstop. This blocks H₂S from touching the seal surface. Measured leakage is zero. It meets Puguang’s Ten Safety Rules for Gas Testing.
2.3 Intelligent Control Fits Operation Needs
It has a PLC + frequency conversion system. It monitors H₂S level, pressure, flow in real time. It triggers auto-shutdown for abnormalities. It supports remote unattended operation. This aligns with the gas field’s “less high-risk manual work” strategy.
3. Safety Compliance: Meeting High-Sulfur Gas Field Standards
Puguang Gas Field follows strict rules: “zero toxic leakage + second-level abnormal response”. The Vigorous device meets all compliance needs.
3.1 Leakage Risk Control
Zero-leakage seal cuts H₂S risk to <1 in 1 million. This is far below the “≤100ppm at 100m” safety limit. It avoids well shutdown from seal failure.
3.2 Built-In Safety Protections
The system has built-in safeguards. These include H₂S over-concentration warning (adjustable threshold), pressure over-limit protection, and motor overload protection. Response time is <2 seconds. It complies with Onshore Oil and Gas Exploitation Safety Rules.
3.3 Material Compliance Verification
2205 duplex steel passed CNPC’s sulfur resistance test. Tungsten carbide coating has HRC65 hardness. It meets the gas field’s “third-party sulfur-resistant material certification” rule.
4. Economic Rationality: Quantifiable Cost Cuts and Gains
The Vigorous device is more economical than traditional gear over its life cycle.
4.1 Lower Maintenance Costs
Traditional drainage gear (e.g., ordinary screw pumps) corrodes fast. Screws and pumps replace every 3 months. The Vigorous device extends part life to >2 years. Annual maintenance per well drops from 4 times to 1. Maintenance costs cut by 75%.
4.2 Significant Energy Savings
It uses 30% less energy than traditional compressors. Calculate by daily use: 1,000 kWh/well (0.65 yuan/kWh industrial price). It saves 109,500 kWh/well yearly. This equals 71,200 yuan in annual electricity savings.
4.3 Higher Production Capacity Gains
Stable backpressure cuts boost liquid-carrying well run time by 25%. Daily gas output per well rises 5,000-10,000 m³ (2.5 yuan/m³ average price). Annual extra gains per well: 4.56-9.13 million yuan. Investment payback is <1.5 years.
5. Environmental Adaptability: Aligning with Green Goals
Puguang is a Sichuan “Environmental Integrity Enterprise”. It strictly controls SO₂, nitrogen oxide, and carbon emissions. The Vigorous device fits these needs.
5.1 Reduced Indirect Emissions
30% energy efficiency cuts standard coal use by 13.4 tons/well yearly. This is based on 300g/kWh thermal power coal use. It also reduces CO₂ by 33.4 tons/well. It helps the gas field meet the Yangtze Economic Belt’s “290,000-ton annual CO₂ cut” goal.
5.2 No Additional Pollution Risks
Plan54 flushing uses the gas field’s clean natural gas. No chemicals are needed (unlike foam drainage). It avoids secondary formation and environmental pollution.
5.3 Low Noise Operation
Operating noise is ≤75dB. It meets Industrial Boundary Noise Standards (GB12348-2008). For mountainous areas: ≤65dB daytime, ≤55dB nighttime. It avoids noise disturbance to surrounding ecology.
III. Feasibility Conclusion and Value
Comprehensive analysis of the five dimensions shows: The Vigorous device is fully feasible for Puguang Gas Field. Its core value has three parts:
- Technical Value: It solves industry bottlenecks in high-sulfur multiphase flow. These include fast corrosion, hard sealing, and poor adaptability. It provides an “integrated, wide-condition” drainage solution.
- Safety and Economic Value: Zero-leakage design and long-life parts balance safety and cost. It delivers three benefits: lower risks, lower costs, higher production.
- Strategic Value: It helps Puguang revitalize shut-in wells. It stabilizes “Sichuan-to-East Gas Transmission” supply. It aligns with national “green low-carbon” and “energy security” goals. It sets a replicable model for domestic high-sulfur gas field development.
In conclusion, the Vigorous device (with twin-screw pump tech) matches Puguang’s needs and goals. It can be the top choice for mid-to-late-stage drainage gas recovery upgrades.
