Protect and Then Inject: Optimized Well Fluids Successfully Drill Depleted Reservoirs To Store Gas
- Stephen Vickers (Baker Hughes) | Stephen Bruce (Baker Hughes) | Alistair Hutton (Baker Hughes) | Paolo Nunzi (Eni)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2012
- Document Type
- Journal Paper
- 113 - 117
- 2012. Society of Petroleum Engineers
- 5.4.2 Gas Injection Methods, 1.11 Drilling Fluids and Materials, 5.6.4 Drillstem/Well Testing, 1.6 Drilling Operations, 4.1.2 Separation and Treating
- Fluids, Gas Storage
- 2 in the last 30 days
- 573 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
A major operator has initiated the data-acquisition campaign in the southern North Sea for a future storage facility capable of holding 5 billion m3 of gas. It is estimated this venture will double the existing gas supplies stored in the UK and represent more than 5% of its annual gas demand. As North Sea gas production decreases and the UK becomes more dependent on imports, the ability to store gas has become an important part of the UK energy policy.
Drilling into depleted reservoirs for gas storage produces several major technical problems and issues that must be addressed. This field is a pressure-depleted reservoir with a differential pressure equivalent to 7.3 lbm/gal between the drilling fluid's hydrostatic pressure and the reservoir pressure. This differential must be controlled to eliminate the risk of differential sticking, downhole losses, and hole collapse.
Because of the reservoir depletion, it would be impossible to backflow and clean up the near-wellbore region without a post-drill-in treatment fluid to remove the fluid filter cake and water-wet all the surfaces for gas injection. To ensure project success and usable fluid designs, reservoir conditions were simulated in the laboratory and fluid parameters were altered to provide the optimum properties to minimize the future risks.
The paper discusses in full the laboratory design process, the verification of the drill-in and treatment fluids as being fit-for-purpose, and their successful application in the field. Initial well testing suggested that the expected injection rates of 500 scf/min at 300 psi were exceeded, with rates of 750 scf/min at 280 psi reported.
|File Size||1 MB||Number of Pages||5|
Aston, M.S., Alberty, M.W., McLean, M.R., de Jong, H.J., and Armagost, K.2004. Drilling Fluids for Wellbore Strengthening. Paper SPE 87130 presented atthe IADC/SPE Drilling Conference, Dallas, 2-4 March. http://dx.doi.org/10.2118/87130-MS.
Evans, D.J. and Chadwick, R.A.. 2009 Underground gas storage : Anintroduction and UK perspective. In Underground Gas Storage: WorldwideExperiences and Future Development in the UK and Europe, ed. D.J. Evans andR.A. Chadwick, No. 313, 1-11. London, UK: Special Publications, GeologicalSociety of London.
Marshall, D.S., Gray, R., and Byrne, M. 1999. Return Permeability: ADetailed Comparative Study. Paper SPE 54763 presented at the SPE EuropeanFormation Damage Conference, The Hague, 31 May-1 June. http://dx.doi.org/10.2118/54763-MS.
Quintero, L., Jones, T.A., Clark, D., and Twynam, A.J. 2007. NAF Filter CakeRemoval Using Microemulsion Technology. Paper SPE 107499 presented at theEuropean Formation Damage Conference, Scheveningen, The Netherlands, 30 May-1June. http://dx.doi.org/10.2118/107499-MS.
van der Zwagg, C.H. 2006. Benchmarking the Formation Damage of DrillingFluids. SPE Prod & Oper 21 (1): 40-50. SPE-86544-PA. http://dx.doi.org/10.2118/86544-PA.
Vickers, S., Cowie, M., Jones, T., and Twynam, A.J. 2006. A new methodologythat surpasses current bridging theories to efficiently seal a varied porethroat distribution as found in natural reservoir formations. PaperAADE-06-DF-HO-16 presented at the AADE 2006 Fluids Conference, Houston, 11-12April.
Vickers, S., Hutton, A., and Halliday, W. 2008. Drill-in fluid design,getting it right from the start! Paper AADE-08-DF-HO-05 presented at the AADEFluids Conference and Exhibition, Houston, 8-9 April.