Reservoir Characterization Begins at First Contact With the Drill Bit
- Sara Shayegi (Shell) | C. Shah Kabir (Hess Corporation) | Flemming If (Hess Corporation) | Soren Christensen (Hess Corporation) | Kosco Ken (Hess Corporation) | Jaime Casasus-Bribian (Hess Corporation) | ABM K. Hasan (Hess Corporation) | Daniel Moos (Dong E&P)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2012
- Document Type
- Journal Paper
- 11 - 21
- 2012. Society of Petroleum Engineers
- 5.5.8 History Matching, 1.8 Formation Damage, 1.6 Drilling Operations, 1.7.1 Underbalanced Drilling, 5.6.4 Drillstem/Well Testing, 1.5 Drill Bits, 5.1 Reservoir Characterisation
- Reservoir evaluation while drilling, Underbalanced drilling, Transient analysis of real-time data
- 2 in the last 30 days
- 720 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
Underbalanced drilling (UBD) offers a unique opportunity to estimate undamaged, in-situ formation properties upon first contact with the formation while drilling. This paper compares well-testing techniques developed for UBD with conventional methods. The reservoir flow rates in combination with flowing bottomhole pressures (BHPs) acquired while drilling can be used to identify productive intervals and estimate dynamic reservoir properties.
Unlike typical UBD projects where reservoir benefits are the primary focus, the driver for this mature field was overcoming the drilling problems associated with the wide reservoir-pressure variability caused by nearby producers and injectors. UBD was piloted as a means to achieving the requisite lateral lengths for reserves capture and meeting production targets. Minimizing formation damage and characterizing the reservoir while drilling were added benefits.
Several reservoir-characterization methods based on rate-transient analysis (RTA) were used to perform well testing while drilling. Rate-integral-productivity-index (RIPI) analysis uses the rate and pressure data acquired during drilling to determine whether additional holes drilled contribute and to ascertain the relative quality of this rock. In the increasing-boundary method, real-time rate and pressure data during drilling, circulating, and tripping allowed assessment of formation properties through history matching. Pressure-buildup data were also available during trips because the concentric annuli allowed the pressure to be monitored below the downhole isolation valve. These data enabled the estimation of reservoir pressure and productivity index (PI) with a proxy vertical-well model for each productive interval drilled. These interpretation methods show close agreement in results and lend credence to the UBD-derived parameters.
|File Size||5 MB||Number of Pages||11|
Ansah, J., Shayegi, S., and Ibrahim, E. 2004. Maximizing Reservoir PotentialUsing Enhanced Analytical Techniques with Underbalanced Drilling. Paper SPE90196 presented at the SPE Annual Technical Conference and Exhibition, Houston,26-29 September. http://dx.doi.org/10.2118/90196-MS.
Biswas, D., Suryanarayana, P.V., Frink, P.J., and Rahman, S. 2003. AnImproved Model to Predict Reservoir Characteristics During UnderbalancedDrilling. Paper SPE 84176 presented at the SPE Annual Technical Conference andExhibition, Denver, 5-8 October. http://dx.doi.org/10.2118/84176-MS.
da Silva, T.P., Kavanagh, T.G., Rennox, J., Savage, P.D.C., and Capps,J. 2007. A Process Delivery Template for an UnderbalancedCoiled-Tubing-Drilling Project From Concept To Execution. Paper SPE 107244presented at the SPE/ICoTA Coiled Tubing and Well Intervention Conference andExhibition, The Woodlands, Texas, USA, 20-21 March. http://dx.doi.org/10.2118/107244-MS.
Gough, G., Talbot, S., and Moos, H. 2011. Offshore UnderbalancedDrilling With a Closed-Loop Circulating System. Paper SPE 143096 presented atthe IADC/SPE Managed Pressure Drilling and Underbalanced Operations Conference& Exhibition, Denver, 5-6 April. http://dx.doi.org/10.2118/143096-MS.
Hasan, A.R. and Kabir, C.S. 1983. Pressure Buildup Analysis: A SimplifiedApproach. J Pet Technol 35 (1): 178-188. SPE-10542-PA. http://dx.doi.org/10.2118/10542-PA.
Hunt, J.L. and Rester, S. 2000. Reservoir Characterization DuringUnderbalanced Drilling: A New Model. Paper SPE 59743 presented at the SPE/CERIGas Technology Symposium, Calgary, 3-5 April. http://dx.doi.org/10.2118/59743-MS.
Hunt, J.L. and Rester, S. 2003. Multilayer Reservoir Model Enables MoreComplete Reservoir Characterization During Underbalanced Drilling. Paper SPE81638 presented at the IADC/SPE Underbalanced Technology Conference andExhibition, Houston, 25-26 March. http://dx.doi.org/10.2118/81638-MS.
Kabir, C.S. and Boundy, F. 2010. Analytical Tools Aid Understanding ofHistory-Matching Effort in a Fractured Reservoir. Paper SPE 135039 presented atthe SPE Annual Technical Conference and Exhibition, Florence, Italy, 19-22September. http://dx.doi.org/10.2118/135039-MS.
Kardolus, C.B. and van Kruijsdijk, C.P.J.W. 1997. Formation Testing WhileUnderbalanced Drilling. Paper SPE 38754 presented at the SPE Annual TechnicalConference and Exhibition, San Antonio, Texas, USA, 5-8 October. http://dx.doi.org/10.2118/38754-MS.
Suryanarayana, P.V., Vaidya, R.N., and Wind, J.A. 2007. Use of NewRate-Integral Productivity Index in Interpretation of Underbalanced DrillingData for Reservoir Characterization. Paper SPE 106756 presented at the SPEProduction & Operations Symposium, Oklahoma City, 21 March-3 April. http://dx.doi.org/10.2118/106756-MS.
van Kruijsdijk, C.P.J.W. and Cox, R.J.W. 1999. Testing While UnderbalancedDrilling: Horizontal Well Permeability Profiles. Paper SPE 54717 presented atthe SPE European Formation Damage Conference, The Hague, 31 May-1 June. http://dx.doi.org/10.2118/54717-MS.
Vefring, E.H., Nygaard, G., Fjelde, K.K., Lorentzen, R.J., Nævdal, G.,and Merlo, A. 2002. Reservoir Characterization During UnderbalancedDrilling: Methodology, Accuracy, and Necessary Data. Paper SPE 77530 presentedat the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA,29 September-2 October. http://dx.doi.org/10.2118/77530-MS.
Vefring, E.H., Nygaard, G., Lorentzen, R.J., Nævdal, G., and Fjelde,K.K. 2006. Reservoir Characterization During Underbalanced Drilling (UBD):Methodology and Active Tests. SPE J. 11 (2): 181-192.SPE-81634-PA. http://dx.doi.org/10.2118/81634-PA.
Wu, Z. and Suryanarayana, P.V. 2011. Reservoir Characterization ThroughAutomatic History Matching of Underbalanced Drilling (UBD) Data in a HorizontalWell. Paper SPE 142892 presented at the SPE EUROPEC/EAGE Annual Conference andExhibition, Vienna, Austria, 23-26 May. http://dx.doi.org/10.2118/142892-MS.