Methodology for Estimating Recovered Solvent in Solvent-Aided Process
- Subodh C. Gupta (Cenovus Energy) | Simon Gittins (Cenovus Energy) | Christian Canas (Cenovus Energy)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- September 2012
- Document Type
- Journal Paper
- 339 - 350
- 2012. Society of Petroleum Engineers
- 4.3.3 Aspaltenes, 5.7.5 Economic Evaluations, 4.3.4 Scale, 7.1.9 Project Economic Analysis, 5.6.5 Tracers, 5.3.9 Steam Assisted Gravity Drainage, 7.1.10 Field Economic Analysis, 4.1.5 Processing Equipment, 4.6 Natural Gas
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- 411 since 2007
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The solvent-aided process (SAP) is a solvent-based enhancement of steam-assisted gravity drainage (SAGD) in which small amounts of solvent, such as light alkanes or natural-gas liquids, are added to the injected steam to enhance reservoir performance and associated project economics. Expectedly, the economics with SAP are sensitive to the solvent recovered from the reservoir, making its measurement in a field test an important factor.
When a single-component solvent such as butane, which is not generally present in the produced heavy oil or bitumen, is used in SAP, estimation of the recovered solvent can be achieved uniquely. But when the solvent also has heavier components, some of which overlap with the lighter components of the produced oil, the measurement is not straightforward. The problem is compounded by the fact that the interaction with the reservoir changes the composition of the produced solvent and makes it time variant on account of different resident times associated with different components. The issue is further complicated by the fact that produced oil also undergoes an in-situ solvent deasphalting process (SDA), which is also time and space variant in the reservoir. If there were no in-situ SDA, one potential method to measure the amount of produced solvent would be to measure the total asphaltene content as an oil "marker" in the produced blend. Use of a tracer with injected solvent, as well as regression-based analyses for solvent fraction (using compositional analyses of solvent, bitumen, and the blend) of the produced blend, is error prone for these same reasons.
Because of the issues in these approaches, a new method is desirable for a more-robust and unique assessment of the solvent amount in the produced fluids. This paper elaborates on the current challenges and proposes a couple of workable methods, including use of maltenes/metals content as oil markers as well as the use of boiling-point curves of the produced blend compared with the boiling point of the base oil.
Such techniques of estimating the recovered solvent can facilitate a more-objective assessment of SAP field tests and enable economic evaluation of SAP application to a commercial scale.
|File Size||471 KB||Number of Pages||12|
Butler, R.M. 1994. Steam-assisted Gravity Drainage: Concept, Development,Performance And Future. J Can Pet Technol 33 (2): 44-50.JCPT Paper No. 94-02-05. http://dx.doi.org/10.2118/94-02-05.
Butler, R.M. and Mokrys, I.J. 1993. Recovery of Heavy Oils Using VaporizedHydrocarbon Solvents: Further Development of the VAPEX Process. J Can PetTechnol 32 (6): 56-62.
Crude Quality Inc. 2012. CrudeMonitor.ca, http://www.crudemonitor.ca/home.php.
Das, S.K. 1998. Vapex: An Efficient Process for the Recovery of Heavy Oiland Bitumen. SPE J. 3 (3): 232-237. SPE-50941-PA. http://dx.doi.org/10.2118/50941-PA.
Gupta, S., Gittins, S., and Picherack, P. 2004. Insights into Some KeyIssues with Solvent Aided Process. J Can Pet Technol 43(2): 97-105. JCPT Paper No. 04-02-05. http://dx.doi.org/10.2118/04-02-05.
Gupta, S., Gittins, S., and Picherack, P. 2005. Field Implementation ofSolvent Aided Process. J Can Pet Technol 44 (11): 8-13.PETSOC-05-11-TN1. http://dx.doi.org/10.2118/05-11-TN1.
Gupta, S.C. and Gittins, S.D. 2006. Christina Lake Solvent Aided ProcessPilot. J Can Pet Technol 45 (9): 15-18. JCPT Paper No.06-09-TN. http://dx.doi.org/10.2118/06-09-TN.
Gupta, S.C. and Gittins, S.D. 2007. Effect of Solvent Sequencing and OtherEnhancements on Solvent Aided Process. J Can Pet Technol 46(9): 57-61. JCPT Paper No. 07-09-06. http://dx.doi.org/10.2118/07-09-06.
Leaute, R.P. and Carey, B.S. 2005. Liquid Addition to Steam for EnhancingRecovery (LASER) of Bitumen With CSS: Results From the First Pilot Cycle. Paperpresented at the 56th Canadian International Petroleum Conference (CIPC),Calgary, 7-9 June. http://dx.doi.org/10.2118/2005-161.
Nasr, T.N., Beaulieu, G., Golbeck, H., and Heck, G. 2003. Novel ExpendingSolvent-SAGD Process ES-SAGD. J Can Pet Technol 42 (1):13-16. JCPT Paper No. 03-01-TN. http://dx.doi.org/10.2118/03-01-TN.
Strausz, O.P. and Lown, E.M. 2003. The Chemistry of Alberta Oil Sands,Bitumens and Heavy Oils, 497. Calgary, Alberta: Alberta Energy ResearchInstitute (AERI).