Acid Gas Injection (AGI) facilities have been constructed and are currently being commissioned at the ExxonMobil Shute Creek Treating Facility in Southwestern Wyoming, United States. The successful startup of the Shute Creek AGI facilities will demonstrate the feasibility of using AGI compression, liquefaction, and pumping technology on large scale projects to dispose of waste acid gases.


This paper discusses the purpose of AGI facilities at Shute Creek and provides an overview of the equipment and processes implemented in the Shute Creek facilities which include acid gas compression, water removal, liquefaction, and pumping. Commissioning of facilities on CO2 and safety considerations of the AGI facilities are also discussed.

This paper has been prepared for presentation at the International Petroleum Technology Conference (IPTC) in Doha, Qatar scheduled for November 21–23, 2005.


Purpose of AGI. The AGI facilities at Shute Creek Treating Facility are intended to replace aging Claus sulfur recovery units. Installation of the AGI facilities will eliminate bottlenecks and avoid downtime associated with the sulfur recovery units. In addition, the AGI facilities allow Shute Creek Treating Facility to exit a historically weak Sulfur market and reduce SO2 emissions.

The AGI facilities at Shute Creek consist of centrifugal compressors, centrifugal pumps, coolers, separation equipment, pipelines and wells to dehydrate and inject acid gas generated in the gas sweetening process. An overall block flow diagram of the Shute Creek AGI facilities is shown in Figure 1. In conjunction with the installation of the AGI facilities, Cogeneration facilities were also installed to generate steam and power for plant consumption.

Unique Characteristics of the Shute Creek AGI Facilities.

There are currently about 80 AGI plants in operation throughout the world. Most of the operating facilities are located in Canada and the United States; however, about 10% of operating AGI facilities are located outside of North America. Most AGI facilities constructed to date consist of reciprocating compressors discharging directly into injection wells. AGI facilities in North America typically have design capacities of less than 5 MCFD. The Shute Creek AGI facilities are anticipated to be the largest in the United States with a design capacity of 65 MCFD of acid gas composed primarily of Hydrogen Sulfide, H2S and Carbon-Dioxide, CO2.

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