Natuna gas processing and recycling.

摘要

Compositional simulation of the Natuna field reservoir shows that separation of carbon dioxide gas from the natural gas in the reservoir can produce gas of marketable quality for use directly as fuel or as a feed for liquefied natural gas (LNG) plants. The carbon dioxide separated from the produced gas can be reinjected into the reservoir to maintain reservoir pressure and to avoid the possible effects of climate change that result from carbon dioxide in the atmosphere.; Existing gas in the reservoir contains more than 70 mol% carbon dioxide, which makes it unusable as it is produced. However, the large quantities of gas in the reservoir suggest that production could be economically sound if the CO₂ can be removed. The reservoir contains 205 Tscf raw gas, which would produce about 9.13 Bscf/D for more than 25 years using the gas reinjection.; Economic analysis of the system shows that the separation and reinjection process would yield a net present value of US {dollar}5.566 billion with an internal rate of return of 15.82%, payout would be reached in 5.3 years.; Our proposed model begins with production of the existing gas, processing through four stages of separation by cooling, and reinjection into the reservoir. Simulation shows that incorporating appropriate combinations of pressure and temperature at each stage of separation is critical to producing the maximum quality product.