Next Generation Zero Emissions Oil Production Facilities & Field Gas Conditioning
Tank Vapor Capture & Monetization
Tank vapor capture is one of the highest-return, lowest-complexity opportunities to convert routine flaring into a direct revenue stream.
At many oil production sites, hydrocarbon vapors from tank batteries are routinely flared or under-monetized. These streams are often rich in natural gas liquids (NGLs), making them disproportionately valuable relative to their volume.
Vapor recovery units (VRUs) are commonly used to capture these vapors and send them to the gas gathering system. While this reduces flaring, it does not fully capture their value. When sold as gas, these streams are priced at gas rates meaning producers realize only a fraction of the underlying liquids value.
By pairing VRUs with field gas conditioning systems, producers can recover heavier hydrocarbons as a liquid product, converting tank vapors into a truckable NGL stream. This approach materially improves project economics while further reducing emissions.
What is Oil Tank Battery Vapor Flaring?
Understanding how these vapors are generated and why they are valuable helps clarify the opportunity.
Oil tank battery vapor flaring refers to the routine combustion of hydrocarbon vapors that accumulate in the vapor space above crude oil and associated liquids stored in oilfield tank batteries when those vapors are not captured or utilized. These vapors largely originate from flash gas and volatile hydrocarbons liberated as produced liquids change pressure and temperature during separation and storage. They are richer in heavier hydrocarbons due to incomplete crude stabilization. While tank vapor flaring serves to prevent unsafe pressures and is a commonly permitted practice, it represents both lost hydrocarbon value and a source of greenhouse gas and volatile organic compound emissions unless captured and beneficially utilized.
Persistent Tank Vapor Flaring - What’s Being Done and Why It Still Happens
Despite its recognized economic and environmental drawbacks, tank vapor flaring persists due to infrastructure and prioritization gaps. Operators often focus capital on production growth rather than installing vapor capture systems such as VRUs or compression equipment needed to handle low-pressure vapors.
In addition, weak gas market economics limit incentives for recovery. Vapors sold into gas midstream typically yield only $10–$18 per barrel equivalent, compared to $28–$38 for Y-grade NGLs. This value gap discourages investment and allows flaring to continue, even where recovery is technically feasible.
The Scale of the Global and U.S. Tank Vapor Flaring Problem
Tank battery vapor flaring is a widespread but often overlooked source of energy loss and emissions in oil and gas operations. These vapors containing methane, NGL components, VOCs, and hazardous air pollutants are frequently vented or flared when not captured, resulting in lost value and environmental impact. While difficult to isolate from total flaring volumes, the scale is significant: global flaring reached 151 bcm in 2024, and in the U.S., flaring and venting account for roughly 0.5% of gross natural gas withdrawals. Regions like the Permian, Bakken, and Eagle Ford are key contributors.
Although tank vapors represent only part of total flaring, their high liquids content makes them disproportionately valuable. Tank-related emissions can account for ~11% of upstream greenhouse gas emissions, while also contributing to VOCs and NOx that impact air quality. Despite 7,000–10,000 VRUs deployed across U.S. sites, many systems remain undersized or absent, leaving substantial volumes unmonetized highlighting both the environmental challenge and economic opportunity.
Turning Tank Vapors into Value - Pioneer Energy’s Approach
Pioneer Energy addresses this gap by combining VRUs with advanced gas conditioning systems to fully monetize tank vapors. VRUs capture up to ~95% of hydrocarbon vapors and deliver them at processing pressure, after which Pegasus systems refrigerate the gas to recover heavy hydrocarbons (C3+) as stable, high-value Y-grade NGLs. These liquids are stored onsite and transported to market, generating significantly higher returns than gas sales alone.
This modular approach supports fast deployment, scalable capacity, and reliable operation across varying field conditions. Pioneer also provides end-to-end support including system design, equipment selection, and performance modeling to forecast liquids yield and optimize project economics. With over a decade of field experience, the solution enables producers to reduce flaring, improve emissions performance, and unlock meaningful new revenue streams from existing operations.
Features of Pegasus Gas Conditioning Systems for Tank Vapor Capture
High-Performance Heavy Hydrocarbon Recovery – Pegasus systems condense and extract heavy hydrocarbons (C3+ components) from rich tank vapor streams, unlocking significant liquids yields that drive superior revenue compared with other tank vapor monetization approaches.
Stable Y-Grade NGL Production – Pegasus conditioning integrates with an onboard stabilizer vessel to produce truckable NGLs, with controlled vapor pressure (≤220 psia) that meets market handling and transport requirements.
Optimized for Low-Pressure Inputs – Designed to work effectively downstream of VRUs, Pegasus units can accept tank vapors boosted from near-atmospheric pressure to processing pressures (~150–220 PSI) without requiring excessive compression horsepower, lowering overall project capital cost.
Multiple Capacity Options (Pegasus VC & LP) – The Pegasus VC (Link to Pegasus VC) is ideal for moderate tank vapor flows, processing up to approximately 450 Mscfd. The Pegasus LP (Link to Pegasus LP) is suited for larger tank batteries and centralized vapor sources, capable of handling up to ~2,000 Mscfd.
Effective Refrigeration & Condensation – Engineered refrigeration facilitates heavy hydrocarbon condensation while minimizing hydrate risk and ensuring robust liquids recovery.
Modular & Scalable Architecture – Pegasus units are skid-mounted and modular, allowing standalone deployment or parallel operation to scale capacity in line with vapor volume, project phasing, and site expansion plans.
Integrated Methanol Dew Point Suppression – Methanol injection systems are incorporated for dew point control - reducing freeze-ups and hydrate formation during cold operation and ensuring continuous processing at peak performance.
Automatic Water & Methanol Separation Support – Optional phase separators and auxiliary skids remove condensed water and methanol from the NGL product stream, minimizing manual handling and field labor associated with liquid storage.
Autonomous Control & Remote Monitoring – Built-in SCADA and control logic enable autonomous operation with minimal field oversight, plus remote monitoring and diagnostics via cellular, LAN, or satellite connectivity.
Improved Environmental Outcome – By capturing and processing vapors that would otherwise be combusted, Pegasus systems reduce greenhouse gas emissions, VOCs, and incomplete combustion products, contributing to better air quality and emissions reporting.
Predictive Performance Modeling – Leveraging Pioneer’s proprietary simulation tools, Pegasus systems can be sized and performance-predicted against actual tank vapor composition data, helping producers forecast liquids yields, product quality, and project economics before deployment.
Rugged, Oilfield-Ready Construction – Built to withstand harsh upstream environments, Pegasus units are engineered for reliable field operation and full compliance with relevant oilfield safety and equipment standards.
Tank Vapor Capture Project Evaluation
Pioneer can provide an evaluation using your tank vapor composition and estimated flow rate to predict expected NGL recovery and project economics.
Contact Us today to learn how Pioneer’s gas conditioning solutions can provide superior economic return for your tank vapor flare capture, monetization and emissions reduction projects.