Influence of Regional Tectonics and Pore-Pressure Depletion on Tight-Gas Recovery in the Sanga Sanga PSC
- M. Rylance (BP Exploration)
- Document ID
- Society of Petroleum Engineers
- SPE International Hydraulic Fracturing Technology Conference and Exhibition, 16-18 October, Muscat, Oman
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 5.8 Unconventional and Complex Reservoirs, 2.4 Hydraulic Fracturing, 3 Production and Well Operations, 3 Production and Well Operations, 4.1 Processing Systems and Design, 2 Well completion, 4 Facilities Design, Construction and Operation, 5 Reservoir Desciption & Dynamics, 4.1.2 Separation and Treating, 3.5.1 Candidate Selection, 5.8.1 Tight Gas, 3.5 Well Intervention
- TIGHT-GAS, PORO ELASTICITY, TECTONICS
- 0 in the last 30 days
- 99 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 9.50|
|SPE Non-Member Price:||USD 28.00|
The Sanga-Sanga PSC fields are located onshore Mahakam delta, East Kalimantan, Indonesia. Since the 1970s, they have produced over 80% of originally estimated gas in place with the remaining gas locked up in low permeability sands. A prize of at least 0.75 Tcf would be achievable, if these sub milli-Darcy resources could be developed. However, previous attempts at hydraulic fracturing, over three decades, have been spectacularly ineffective and rarely enjoyed any improvement or uplift at all.
During late 2006, a detailed review of the regional stress-state and prior unsuccessful frac operations was performed. This review unearthed significant evidence of a reverse stress-ordering in the deep low permeability sands, resulting in horizontal fractures being created. While this provided some logic behind the widespread failure rate, it did not in itself offer a direct solution. However, there was also sufficient evidence from previous frac history, to indicate that the solution may lie with a pore-pressure reduction. A pilot program, with meticulous candidate selection was planned to investigate this.
Further investigation determined the presence of a strong poro-elastic relationship and it was assessed that when combined with longevity of production (30 years), that the stress-state would be substantially affected. During 2008, a suite of well candidates were carefully selected with a range of reduced pore- pressures, aligned with the poro-elastic understanding, hydraulic frac treatments were performed and the wells flowed and produced for two years to confirm productivity. The subsequent production behaviour, confirmed a very positive response and the treated wells netted substantial gas/condensate sales. Production behaviour confirmed the poro-elastic relationships and a set of absolute guidelines on candidate selection and fracture execution were created. Subsequent operations that have adhered to these strict guidelines have been extremely successful. The ability of the new approach to reverse a 30- year trend of hydraulic fracturing failure will now lead to the development of the remaining resource within the fields. An extensive treatment campaign will now be possible to perform with between 50 - 100 candidates well opportunities likely to be available in the field.
A careful assessment of the regional stress-state indicated a reverse ordering of the principal stresses as being the root cause of the poor hydraulic fracturing behaviour. However, careful consideration of the rock mechanics and a coherent pilot programme demonstrated the ability, under effective depletion conditions, to place economic and successful hydraulic fracturing treatments.
|File Size||4 MB||Number of Pages||38|
Addis, M.A. (1997). "The Stress-Depletion Response of Reservoirs". SPE ATCE, San Antonio, TX, USA, 5 - 8 October, SPE-38720-MS http://dx.doi.org/10.2118/38720-MS
Agee, D.M., Yufho, A.,Schafer, L.,Thouvenin, E.,Grant, G.,Garnier, A. and Wijanarko, A. (2010). "Post-Fracturing Fluid Recovery Enhancement with Microemulsion". SPE International Symposium and Exhibition on Formation Damage and Control, Lafayette, LA, USA, 10 - 12 February. SPE-128098-MS http://dx.doi.org/10.2118/128098-MS
Arifin,Arta, P. and Castillo, D. (2003). "A Geomechanical Modeling Approach In Deep Horizontal Well Development Designs". SPE International Improved Oil Recovery Conference Asia Pacific, Kuala Lumpur, Malaysia, 20 - 21 October. SPE-84901-MS http://dx.doi.org/10.2118/84901-MS
Corbellini, J.B.Ratno, A.,Negara, I.M.,Gultom, L.P.,Hazman,Soenoro, A. and Benyamin. (2011). "Effective Permeability 3D Model Unlock the Uncertainty Production in Low Perm Fluvial-Deltaic Reservoirs, Nilam Field, Kutai Basin, Indonesia". International Petroleum Technology Conference, Bangkok, Thailand, 7 - 9 February. SPE/IPTC-14309-MS http://dx.doi.org/10.2523/IPTC-14309-MS
Ferguson, A. and McClay, K., (1997). "Structural Modelling within the Sanga PSC, Kutai Basin, Kalimantan, its application to paleochannel orientation studies and timing of hydrocarbon entrapment," in Howes,J.V.C. and Noble,R.A. eds., Proceedings of the IPA Petroleum Systems of SE Asia and Australasia Conference: Indonesian Petroleum Association, p. 709 – 726.
Hazman,Alam, H.,Wijanarko, A.Kumiyati, U.,Prihartono, Y.A.,Prihandono, B.,Ianiro, A.R.,Narayanan, R.K.,Schmohr, D.R. and Rylance, M. (2008). "Successful Application of Cluster Drilling Concept to Reduce Cost and Increase Profitability in a Mature Onshore Gas Field in east Kalimantan". SPE Asia Pacific Oil and Gas Conf. and Exh., Perth, Australia, 20 - 22 October, 2008. SPE-116537-MS. http://dx.doi.org/10.2118/116537-MS
Martins, J.P.,Leung, K.H.,Jackson, M.R.,Stewart, D.R. and Carr, A.H. (1992). "Tip Screenout Fracturing Applied to the Ravenspurn South Gas Field Development," SPE ATCE, San Antonio, TX, USA, 8-11 October. SPE 19766. http://dx.doi.org/10.2118/19766-PA
Martins, J.P.,MacDonald, J.M.,Stewart, C.G. and Philips, C.J. (1995). "The Management and Optimisation of a Major Wellwork Program at Prudhoe Bay," SPE ATCE, Dallas, TX, USA, 22 - 25 October. SPE-30649-MS. http://dx.doi.org/10.2118/30649-MS
Moss, S.J.,Chambers, J.,Cloke, I.,Carter, A.,Satria, D.,Ali, J.R. and Baker, S. (1997). "New observations on the sedimentary and tectonic evolution of the Tertiary Kutai Basin, East Kalimantan," in Fraser,A.MatthewsS. and Murphy,R.W. eds., Petroleum geology of Southeast Asia: Geological Society of London, Special Publication, v. 106, p. 395.
Penny, G.S.,Pursley, J.T. and Holcomb, D. (2005). "The Application of Microemulsion Additives in Drilling and Stimulation Results in Enhanced Gas Production". Production and Operations Symposium, Oklahoma City, OK, USA, 17 - 19 April. SPE-94274-MS http://dx.doi.org/10.2118/94274-MS
Rylance, M. (2010). "If at First You Don't Succeed, Try, Try Again: Time Dependent Fracturing Success". ADIPEC, Abu Dhabi, UAE, 1 - 4 November. SPE-135827-MS. http://dx.doi.org/10.2118/135827-MS
Wijanarko, A.,Rylance, M.,Pizzolante, I.,Chatib, H. & Dharma, B. (2010). "Breaking Low Permeability Fracturing Myth - VICO Indonesia". Asia Pacific Oil and Gas Conference and Exhibition, Brisbane, Queensland, Australia, 18 - 20 October. SPE-133953-MS http://dx.doi.org/10.2118/133953-MS
Wijanarko, A.,Ismanto, B. S.,Permana, R. C. and Pizzolante, I. (2012). "Renewal Plan: Efficient Strategy for Optimum Development in Mature Fields - A Success Story from Sanga-Sanga Assets, Indonesia". SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 22 - 24 October. SPE-158716-MS http://dx.doi.org/10.2118/158716-MS