Planning and Execution of Highly Overbalanced Completions From a Floating Rig: The Ursa-Princess Waterflood Project
- Craig D. Stair (Shell International E&P) | Charles Hinnant (Shell International E&P) | Natalya O. Hines (Shell International E&P) | Jamie M. Schober (Shell International E&P) | Christopher L. Davis (Shell International E&P) | Kenneth Frank Lizak (Shell International E&P) | Brian A. Pugh (Shell International E&P)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2011
- Document Type
- Journal Paper
- 396 - 407
- 2011. Society of Petroleum Engineers
- 2.2.2 Perforating, 1.7.5 Well Control, 1.6.5 Drilling Time Analysis, 5.7.2 Recovery Factors, 2 Well Completion, 2.2.3 Fluid Loss Control, 4.2.4 Risers, 1.10 Drilling Equipment, 1.6 Drilling Operations, 2.4.3 Sand/Solids Control, 2.7.1 Completion Fluids, 5.4.1 Waterflooding, 5.2.1 Phase Behavior and PVT Measurements
- overbalanced perforating, floating rigs, well control, overbalanced completions
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- 436 since 2007
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The Ursa-Princess Waterflood (UPWF) targets the Lower Yellow sand, the main reservoir in the Mars-Ursa basin in Mississippi Canyon, approximately 60 miles south of the mouth of the Mississippi River in the Gulf of Mexico (GOM). The Lower Yellow sand, a world-class Upper Miocene turbidite reservoir, has been on production in the Ursa and Princess fields since 1999, and has been drawn down nearly to the bubblepoint. The waterflood is intended to increase and stabilize reservoir pressure, and to improve sweep efficiency. To accomplish this, four subsea injectors were designed and constructed to inject treated seawater at 40,000 B/D each for a target life of 30 years.
Because the Lower Yellow reservoir was already highly depleted, unique risks were identified in the planned subsea completion operations, to be conducted from a mobile offshore drilling unit (MODU). Seawater, used as a completion fluid, was expected to be up to 4,000 psi overbalanced to the reservoir, depending on the well location. This created the risk of either an uncontrollable fluid-level drop in the marine riser or an extreme impairment to the sandface completion. In order to maintain well control with a fluid level at the surface and still deliver low-skin completions, multiple design and procedural issues needed to be addressed, including the following:
- Control systems on the rig and riser system to prevent uncontrollable fluid-level drop.
- Perforating systems to minimize impairment in a highly overbalanced environment without adding undue risk to well control.
- Pill designs that could both control fluid loss at the sandface and clean up effectively.
- Downhole completion systems capable of functioning either under very high pressure differentials or against very high loss rates.
- Development of high-burst screens suited to the use of fluid-loss-control pills as a contingency provision in the event that mechanical fluid-loss devices failed.
As more deepwater reservoirs approach depletion, specialized tools and procedures will be required to continue to deliver safe and effective sandface completions from floating rigs. This paper details many of these considerations and summarizes the execution experience and results for one such reservoir.
|File Size||653 KB||Number of Pages||12|
API RP 16Q, Design, Selection, Operation and Maintenance ofMarine Drilling Riser Systems. 2001. Washington, DC: API.
API RP 19B, Recommended Practices for Evaluation of WellPerforators, second edition. 2006. Washington, DC: API.
API SPEC 16D, Control Systems for Drilling Well Control Equipment andControl Systems for Diverter Equipment, second edition. 2004. Washington,DC: API.
API TR 5C3, Technical Report on Equations and Calculationsfor Casing, Tubing and Line Pipe used as Casing or Tubing; and PerformanceProperties Tables for Casing and Tubing. 2008. Washington, DC: API.
Gillespie, G., Hinnant, C., Davis, C.L., Schober, J., and Darring, M. 2008. Screen Development To Withstand 4000-psi Overbalance,Subhydrostatic Completion in Deepwater GOM Subsea Waterflood Injector Wells.Paper SPE 116091 presented at the SPE Annual Technical Conference andExhibition, Denver, 21-24 September. http://dx.doi.org/10.2118/116091-MS.
ISO 17824:2009, Petroleum and natural gasindustries--Downhole equipment--Sand screens. 2009. Geneva, Switzerland:ISO.
Jannise, R.C. and Edwards, W.J. 2007. Innovative Method for PredictingDownhole Pressures During Frac-Pack Pumping Operations Facilitates MoreSuccessful Completions. Paper SPE 109837 presented at the Asia Pacific Oil andGas Conference and Exhibition, Jakarta, 30 October-1 November. http://dx.doi.org/10.2118/109837-MS.
Lizak, K.F. and Hinnant, C. 2010. Deepwater Frac-Pack Maximum TreatingPressure Limits, An Examination Using Bottom-Hole Pressure Gauges. Paper OTC20434 presented at the Offshore Technology Conference, Houston, 3-6 May http://dx.doi.org/10.4043/20434-MS.