Tengiz sour gas injection project: An update

Gulnara Urazgaliyeva, Gregory R. King, Sabyrzhan Darmentaev, Damira Tursinbayeva, Darrin Dunger, Randy Howery, Tom Zalan, Karl Lindsell, Elrad Iskakov, Assel Turymova, Steve Jenkins, Chuck Walker, Phil Bateman, Abzal Aitzhanov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

19 Scopus citations


The Tengiz oilfield is a giant, carbonate reservoir of Devonian to Carboniferous age located in the Pricaspian Basin of the Republic of Kazakhstan. Gas Injection at the Tengiz field began in January 2007 with sweet gas injection as Phase 1 of the Sour Gas Injection (SGI) pilot project followed by sour gas injection as Phase 2. Phase 2 injection began in October 2007, but was interrupted due to initial start up problems. Continuous sour gas injection was achieved three months later in January 2008. The SGI project has four signposts for success: compressor reliability, injectivity, wellbore durability, and reservoir performance. The sour gas compressor at Tengiz was the first of its kind and has had greater than 90% availability when the Second Generation Plant (SGP) has been operational (SGI injection gas is produced through SGP). Injectivity has exceeded expectations and wellbore durability has also been excellent. Reservoir performance is a longer term signpost which is monitored though an extensive surveillance program. The Tengiz Reservoir appears to be performing as expected to the sour gas injection. The SGI project is a first-contact miscible gas injection process consisting of seven inverted five-spot patterns. To expedite data acquisition, the SGI well patterns were designed to include one "super-spot" pattern (twin injectors 100 m apart providing dedicated injection support to different geologic layers) and three short-spaced producers (producer-injector spacing approximately 1/3 of the standard spacing). Tracers, pulse tests, multiphase meters, gas saturation logs, and production and injection logs are used to monitor and understand reservoir performance. A specialized simulation model (the SGI Monitoring Model) was constructed which uses local grid refinement in the SGI pattern area. This model is used to determine how well the reservoir characterization is able to capture the dynamic reservoir response to the miscible SGI process. An earlier paper (Darmentaev et. al., 2010) discussed preliminary results from the SGI project. The proposed paper will discuss recent results from the reservoir surveillance program, how these recent results compare to the preliminary results, and the integration of all results into our current understanding of SGI performance. In addition, updates to the Monitoring Model, lessons learned and best practices developed since the commencement of sour gas injection will be discussed.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Annual Caspian Technical Conference and Exhibition
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613993545
StatePublished - 2014
EventSPE Annual Caspian Technical Conference and Exhibition - Astana, Kazakhstan
Duration: Nov 12 2014Nov 14 2014

Publication series

NameSociety of Petroleum Engineers - SPE Annual Caspian Technical Conference and Exhibition


OtherSPE Annual Caspian Technical Conference and Exhibition

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Fuel Technology


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