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COAL SEAM GAS: AN EXPERIENCE SHARING FROM GLNG PROJECT

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Guest lecture is a weekly event that is held by SPE ITB SC collaborating with IATMI SM ITB and HMTM ‘PATRA’ ITB. This week, a guest lecture themed “Coal Seam Gas: An experience Sharing from GLNG Project” was conducted on November 14, 2015 at Total Handil Room, Petroleum Engineering Building, ITB. The speaker is Mr. Julfree Sianturi, a petroleum engineering alumni batch 1994.

In this guest lecture, Mr. Julfree shared his story when he was working on a CSG (Coal Seam Gas) project in Brisbane, Australia. To begin with, he opened his presentation with a quote “Where coffee talk is more important than a formal meeting”. What does he imply by saying this? You may know the reason soon.

CSG or Coal Seam Gas is a term that Australian use for Coal Bed Methane (CBM). Australian prefer calling it CSG than CBM because the coal does not merely contain methane but also any other gases. First, he told us about current development of CSG in four countries, which are USA, China, Australia, and Indonesia. While China is still in struggle of exploiting CSG, USA has developed facilities and make use of CSG, and it is the same as in Australia. How about Indonesia? We have not done anything to produce CSG.

There are some problems that we may face in order to produce CSG. Since the reservoir will solely produce water during the first several years, a company that is willing to exploit CSG need a huge initial invest. Furthermore, the challenge in dewatering process is how the water treatment should be done. Additionally, many wells have to be synchronized due to lateral structure of the reservoir. However, in attempt to develop CSG field, more than 100 well is required.

Having more than three years of experience working as reservoir management engineer on CSG project in Brisbane, Mr. Julfree can tell us a lot about what he has been done in that field. Santos GLNG Project covers several basins that are located in Australia, namely: Canning basin, Perth basin, Cooper Basin, Bowen basin, Marybourough Basin, Gippsland Basin, and Surat basin. This project involved other companies besides Santos due to its huge investment. Those companies are Kogas from South Korea, Petronas from Malaysia, and Total from France.

In this occasion, Mr. Julfree explained about project in two fields (Roma Field and Fairview Field) where he took part in it. Roma Field is located in the north western part of the Surat basin. It is very complex inasmuch as it has several layers of thin coal. To procude CSG, it also requires approximately a thousand wells. Thus, in order to develop that field, many reservoir management matrix engineers are needed. Their job is to summarize the field into development scope to know what we do not know and to find the way to obtain it. The second field is Fairview Field. Fairview Field that is located in Bowen Basin can be called “world class field” because it has 1 D permeability, 7-15 m3/ton gas content, 98% HC saturation.

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After material delivering session, the moderator closes the guest lecture. After that, representatives from SPE ITB SC, IATMI SM ITB and HMTM ‘PATRA’ ITB gave certificate to the speaker as an appreciation for him. Lastly, the speaker together with all the participants had photo session.

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