Greenhouse Gas Emission Reduction and Enhancing Profitability of Legacy Gas Field Via Turbo-Expander

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides a cost-effective method for emission reduction in gas processing with detailed engineering and economic analysis.

🏢実務担当者:Oil and gas companies can adapt this turbo-expander retrofit to improve condensate recovery and reduce emissions in legacy fields.

🏛政策担当者:Demonstrates that positive NPV can be achieved without carbon pricing, supporting policies that incentivize energy efficiency over carbon taxes.

GHG emission reduction is currently a spot-lighted topic worldwide in every industry. While the leading companies try to reduce their carbon footprint, minimizing the CO2 abatement cost is a challenge to bring oil and gas companies toward Net-Zero. This innovative idea alters the perception of the GHG emission reduction project where the CO2 abatement cost is normally on the positive side. With a proper process design and opportunity optimization, the net revenue could be positive for the GHG emission reduction project. Greater Bongkot South platform, the PTTEP legacy gas field, operates NGL recovery system with JT valve since beginning of the operation. The idea concept aims to provide engineering feasibility comparing the benefit of Turbo Expander installation over the existing JT Valve with preliminary cost estimation, economic evaluation and CO2 equivalent reduction which follows the SD strategies on GHG reduction. Regarding lower gas nomination forecasted and exported condensate rate in low condensate production mode, the existing condensate treatment system and NGL recovery heat exchanger shows the available capacity left over even the field potential is maintained. This information energized the opportunity of NGL recovery scheme by increasing the condensate recovery at the NGL recovery unit which will result in increasing the condensate closed circulation in the condensate treatment system, however, with the capacity ullage from the forecasted field production, the existing condensate treatment system is able to handle the mentioned additional re-circulation. The idea of improvement is to maximize the power integration in the existing system where power lost at the existing JT valve is recovered as a compression power for the booster compressor unit. Fuel gas consumption reduction is expected at the Booster Compressor unit where its compression ratio is reduced due to recompression gains from the Turbo Expander Unit hence less GHG emission intensity is expected. Key engineering challenge on recovery of the heavy hydrocarbon gas, in the other words, light condensate liquid, is the closed recirculation of recovered hydrocarbon which wastefully occupies the system capacity. Selection on the returning point of the recovered stream is crucial to minimize the recirculation while increasing production yield. It is to be noted that, by applying this process changes, gas export flow rate is expected to be reduced as the heavy portion of the gas is push to the condensate system. As heavy ends in the gas stream is extracted, the impact on the exported gas are the reduced in total gas export rate and the reduced in gas export heating values which both will impact the revenue from gas sale negatively. However, this is traded off by the increasing in condensate export rate as the heavy hydrocarbon is push into the condensate stream which results in higher revenue from the hydrocarbon sale in total. The selected option provides less modification works whereas the entire recovered stream feeding back to the existing condensate treatment system is feasible while the existing facilities at its maximum capacity are utilized. Moreover, it is expected for condensate recovery from Turbo Expander installation and provides attractive NPV. Cost estimation is conducted together with economic evaluation for investment decision. The project provides an attractive positive NPV. The economic evaluation results in positive NPV mainly due to the condensate gain from the NGL recovery insisting that greenhouse gas reduction project could be performed in the techno-economical way. It is to be noted that there is no benefit from carbon tax or credit is accounted in the economic evaluation at the time of the study.

• semanticscholar https://doi.org/10.4043/36453-msfirst seen 2026-05-15 17:36:29 · last seen 2026-06-16 05:04:12