EOR in Tight Reservoirs, Technical and Economical Feasibility
- K. Joslin (Computer Modelling Group) | S. G. Ghedan (Computer Modelling Group) | A. M. Abraham (Computer Modelling Group) | V. Pathak (Computer Modelling Group)
- Document ID
- Society of Petroleum Engineers
- SPE Unconventional Resources Conference, 15-16 February, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 2 Well completion, 3 Production and Well Operations, 3.3 Well & Reservoir Surveillance and Monitoring, 5.4 Improved and Enhanced Recovery, 5.7.2 Recovery Factors, 2.4.1 Fracture design and containment, 2.5.4 Multistage Fracturing, 5 Reservoir Desciption & Dynamics, 5.4 Improved and Enhanced Recovery, 2.4 Hydraulic Fracturing, 5.4.1 Waterflooding, 3.3.6 Integrated Modeling, 5.7 Reserves Evaluation, 5.4.2 Gas Injection Methods
- Miscible CO2 Flooding, EOR, Water Flooding, Tight Reservoirs, Immscible N2 Flooding
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Field experience indicates that primary depletion of tight oil formations, using multistage fractured horizontal wells, commonly recovers only 5 to 10% of OOIP. The impact of various EOR techniques on recovering additional oil from these formations is still not fully understood. This paper investigates the applicability of feasible EOR methods and determines their technical and economic success over the natural depletion process under different well and fracture designs. Additionally, the study investigates the minimum reservoir permeability required for success.
To achieve the objectives, both black oil and compositional simulation models were generated for a Western Canadian tight reservoir containing volatile oil. In addition to primary, the EOR recovery processes that were considered include waterflooding, immiscible-N2 and miscible-CO2 gas flooding. Combinations of these techniques, coupled with the effects of various well and fracture design parameters were technically explored, and economically ranked using a comprehensive economic analysis. Furthermore, the optimal case of each process was subjected to sensitivity on matrix permeability to determine the minimum permeability at which these methods can be applicable.
In the EOR scenarios evaluated, the highest cumulative oil produced was associated with the closest well and fracture spacing, and longest fracture half length. With a larger well spacing (in the order of 400 m), the wells were found to be too far apart to offer any benefit from any EOR technique. Additionally, the capital expenditure of tight-oil projects is high and therefore greatly influences the economic success. Several scenarios yielded similar NPV values, however, the IRR performances and CAPEX requirements helped further evaluate and rank the scenarios.
For the reservoir model used, waterflood was found to be uneconomical at the initial permeability levels investigated (around 0.3 md) and required a minimum permeability threshold (1 mD) to become profitable. The primary recovery mechanisms in waterflooding are pressure maintenance and areal sweep, which were more pronounced in the N 2flood. This was the best recovery technique based on NPV. However, the best recovery technique based on oil recovery was the miscible-CO2 flood. It offered an increase in oil recovery factor from 11% to 23% over the best natural depletion case, which was a result of increased oil mobility by dissolution of CO2. At lower permeability values (down to 0.03 mD) immiscible-N2 flood became the most effective method via pressure maintenance within the drainage area. For even tighter reservoirs (under 0.03mD), natural depletion remained the best option for this reservoir.
This paper provides an elaborate workflow for evaluating and optimizing EOR techniques in tight oil formations through an integrated modeling approach. It helps to identify the most technically and economically proficient techniques under different levels of permeability, well spacing and fracture parameters.
|File Size||1 MB||Number of Pages||18|
Cherian, B., Stacey, E., Lewis, R., Iwere, F., Heim, R., and Higgins, S.,2012: "Evaluating Horizontal Well Completion Effectiveness in a Field Development Program, Paper SPE 152177, Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, TX, 6-8 February. http://dx.doi.org/10.2118/152177-MS
Christensen, J.R., Stenby, E.H., and Skauge, A. 2001:" Review of WAG Field Experience", SPE Reservoir Evaluation and Engineering, 4(2), 97-106. http://dx.doi.org/10.2118/39883-MS
Ghaderi S.M., Clarkson, C.R., Chen, S. 2013 Investigation of Economic Uncertainties of CO2 EOR and Sequestration in Tight Oil Formations. Paper SPE-165301-MS, presented at the SPE Enhanced Oil Recovery Conference in Kuala Lumpur, Malaysia, 2-4 July. http://dx.doi.org/10.2118/165301-MS
Ghaderi, S. M., Clarkson, C., R., Kaviani, D. 2012. Evaluation of Recovery Performance of Miscible Displacement and WAG Processes in Tight Oil Formations. Paper SPE 152084-MS, presented at the SPE/EAGE European Unconventional Resources Conference and Exhibition, Vienna, Austria, 20-22 March. http://dx.doi.org/10.2118/152084-MS
Hawthorne, S. B., Gorecki, C. D., Sorensen, J. A., Steadman, E. N., Harju, J. A., Melzer, S. 2013. Hydrocarbon Mobilization Mechanisms from Upper, Middle, and Lower Bakken Reservoir Rocks exposed to CO. Paper SPE 167200-MS, presented at the SPE Unconventional Resources Conference Canada, Calgary, Alberta, Canada, 5-7 November. http://dx.doi.org/10.2118/167200-MS
Kathel, P., Mohanty, K.K. 2013. EOR in Tight Oil Reservoirs through Wettability Alteration. Paper SPE 166281-MS, presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 30 September-2 October. http://dx.doi.org/10.2118/166281-MS
Schweitzer, R.Bilgesu, H. I.. 2009. The Role of Economics on Well and Fracture Design Completions of Marcellus Shale Wells. Paper SPE-125975-MS, presented at SPE Eastern Regional Meeting, Charleston, West Virginia, 23-25 September. http://dx.doi.org/10.2118/125975-MS
Shoaib, S., Hoffman, B.T. 2009. CO2 Flooding the Elm Coulee Field. Paper SPE 123176-MS, presented at the SPE Rocky Mountain Petroleum Technology Conference, Denver, Colorado, USA, 14-16 April. http://dx.doi.org/10.2118/123176-MS
Song, C., Yang, D.,2013. Performance Evaluation of CO2 Huff-n-Puff Processes in Tight Oil Formations. Paper SPE 167217, presented at the SPE Unconventional Resources Conference, Calgary, AB, 5-7 November. http://dx.doi.org/10.2118/167217-MS.
Thomas, A., Kumar, A., Rodrigues, K., Sinclair, R., Lackie, C., Galipeault, A., Blair, M. 2015. Understanding Water Flood Response in Tight Oil Formations: A Case Study of the Lower Shaunavon. Paper SPE 171671-MS, presented at the SPE/CSUR Unconventional Resources Conference, Calgary, Alberta, Canada, 30 September–2 October. http://dx.doi.org/10.2118/171671-MS
Wang, Z., Ma, J., Gao, R., Zeng, F., Huang, C., Tontiwachwuthikul, P., and Liang, Z., 2013: "Optimizing Cyclic CO2 Injection for Low Permeability Oil Reservoirs through Experimental Study", Paper SPE 167193, Presented at the SPE Unconventional Resources Conference, Calgary, AB, 5-7 November. http://dx.doi.org/10.2118/167193-MS
Yu, W., Lashgari, H., Sepehrnoori, K. 2014. Simulation Study of CO2 Huff-n-Puff Process in Bakken Tight Oil Reservoirs. Paper SPE 169575-MS, presented at the SPE Western North American and Rocky Mountain Joint Regional Meeting, Denver, Colorado, USA, 16-18April. http://dx.doi.org/10.2118/169575-MS