SPEGetToKnow — First Technical Guest Lecture

SPEGetToKnow. Bandung, August 25th 2017.

Collaboration of three big organizations from Petroleum Engineering, HMTM “PATRA” ITB, SPE ITB SC, and IATMI SM ITB, invited four speakers from ConocoPhillips to techinical guest lecture themed “Suban-South Sumatera Giant Fractured Gas Reservoir Development and Challenges”. Topics that will be discussed including field overview, production history, geomodelling concept, reservoir engineering analysis and field plan of development. Iskandar Muda, one of the speakers, opened the discussion with introducing company profiles of Conoco Phillips. ConocoPhillips’ core values are abrivated to SPIRIT, consist of safety, people, integrity, responsibility, innovation and teamwork. Conocco has had a presence in Indonesia for more than 45 years. ConocoPhillips has three PSC contracts in Indonesia, South Jambi B, Corridor and Kualakarun Block. He also introduced us about work environment and work life balance given by ConocoPhillips to its employee. Summed up, ConocoPhillips sure tried their best to set programs in order to give the comfort and encouraging environment for its people and appreciate employee’s achievement in their own unique way. Iskandar also told us about the work opportunity in ConocoPhillips now, and it still opens for us, although it mostly giving opportunities in practical work for active students at education level D3, S1, S2 and S3, also internship program for recent graduates at education level D3, S1 and S2.

Then main session was opened by Martin Mlanick, he was giving presentation made by himself and Hani Mohede. The presentation was including the topics written above, focusing on characteristics, potential and production of fractured gas reservoir at Suban. Began with first topic about the field overview, Suban field was discovered in 1998, consisted of three formations including Batu Raja (limestone), Talang Akar (sandstone) and Basement (tight rock; granite). Its depth is 1800–3200m and the hydrocarbon type is retrograde gas, yielding condensate around 11.7 bbls/mmscf. The driving mechanism used was depletion gas drive. For retrograde gas, the most useful PVT test is Constant Volume Depletion (CVD). Suban field is considered a “big reservoir”, because it is producing 120,000 bbl/day from only fifteen wells. In slides of production history, one of the figures showed us 3D-modelled-graphs showing relationship of heterogeneity and production mechanism. Another importantly discussed figure is a plot of p/z versus Gp, which gave us insight about the possibility of better p/z match through multi tank model. Martin told us that there are lot of reservoir that looked “simple” in beginning, but found out to be more complicated than we ever predicted, and Suban field is included. As reservoir matures, so does our understanding, because most of fields become increasingly more complex with time and the data collection strategy need to be revisited and adjusted. Because Suban is a fractured reservoir, we also encountered lots of reservoir modelling challenges, one of them is identification of major and minor faults, and so on. There are two main concepts in geomodelling, such as matrix and fracture modelling.

From data acquisition history, the production time of Suban field can be separated into three phase, including early development, continuous production and further development. In early development phase , from 1998–2003, there were pressure transient test, interference test, production log and PVT analysis conducted. Next, in continuous production phase, from 2004–2009, static grad survey was conducted. Last, in further development phase, from 2010–2013, the static grad survey, PVT analysis and multiple-rate FGS were finally conducted.

When the presentation session was come to an end, the moderator, Abdel M.Deghati opened the question and answer sessions. There were more than five questions asked, but writer only wrote down four of them. William A., he asked about the vacancy and career prospects in ConocoPhillips, Fadly E. asked about why the rising in gas price ended in higher profit for government, Hanif asked about the identification of natural fracture reservoirs and last question was about how we proceed Plan of Development if we need to redo reservoir modelling in frequent. The questions was all answered and the guest lecture is officially ended with momento giving sessions to speakers and photo sessions.

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