New Insights in the Characteristics Required for A Successful Flowback Surfactant and Its Use in Tight and Unconventional Reservoirs
- Ahmed Rabie (Solvay) | Jian Zhou (Solvay) | Qi Qu (Solvay)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 26-28 March, Beijing, China
- Publication Date
- Document Type
- Conference Paper
- 2019. International Petroleum Technology Conference
- 1.6.9 Coring, Fishing, 1.6 Drilling Operations, 2.4 Hydraulic Fracturing, 3 Production and Well Operations, 5.5.2 Core Analysis, 2.5.2 Fracturing Materials (Fluids, Proppant), 2 Well completion
- Oil productivity, Interafacial tension, water recovery, coreflood, Flowback surfactant
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Hydraulic fracturing has always been associated with significant volumes of fracturing fluid invading the formation matrix, which leads to water blockage and a reduction in relative permeability to gas or oil. In Shale and tight formations, this has become more challenging since capillary forces have profound impact on water retention and hence, water recovery and subsequent oil productivity. Surfactants and microemulsions have been extensively reported as flowback additives to lower surface and interfacial tension to maximize water recovery.
Most of the previous studies focused on a few testing methods to validate a surfactant or a microemulsion formulation for flowback use. In this work, a new environmentally friendly water-based surfactant formulation (Surf-I) was evaluated for flowback and its performance was compared against several industry standards of microemulsions and non-ionic alcohol ethoxylated surfactant. Surface tension (ST), interfacial tension (IFT), contact angle (CA), and coreflood tests were conducted in a wide range of typical field conditions of water salinity, temperature, crude oil type, and surfactant concentration. Core flow testing on 0.1-0.3 md Kentucky sandstone was conducted simulating oil reservoirs following constant-pressure flow schemes of 50-500 psi. Water recovery and oil productivity were determined for each pressure stage.
The new formulation showed a surface tension of 26 mN/m with CMC corresponding to a load of 0.1-0.3 gpt, depending on the water salinity. Interfacial tension measurements varied from 0.17 mN/m to 10 mN/m, depending on the crude oil type and temperature. Contact angle measurements indicated the surfactant ability to water-wet controlled substrates. The coreflood results confirmed the benefit of using surfactants for flowback versus non-surfactant cases, especially at low- to mid-pressure flow and. At 50 psi pressure difference, no oil was observed in the no-surfactant case. At 100, 250, and 500 psi the oil productivity with surfactant was 53, 22, and 20% higher than the base case. The results also showed that a formulation with ultra-low IFT (5E-2 mN/m), can initially recover substantial water volume but did not show a superior performance over the new formulation. The data obtained in this study can be used to identify the optimum criteria of a flowback additive in terms of surface tension, IFT, and wettability requirement to enhance water recovery and maximize oil productivity.
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Cawiezel, K.E., Singh, A.K., Carman, P.S.. 2010. The Selection and Optimization of a Surfactant Package to Maximize Cleanup of a High-Density Fracturing Fluid. Presented at the SPE Deepwater Drilling and Completions Conference, Galveston, Texas, USA, 5-6 October. SPE-136812-MS. https://doi.org/10.2118/136812-MS.
Champagne, L. M., Zhou, H., Zelenev, A. S.. 2012. The Impact of Complex Nanofluid Composition on Enhancing Regained Permeability and Fluid Flowback From Tight Gas Formations and Propped Fractures. Presented at the SPE International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, USA, 15-17 February. SPE-151845-MS. https://doi:10.2118/151845-MS.
Galindo, T.A. and Rimassa, S.M. 2013. Evaluation of Environmentally Acceptable Surfactants for Application as Flowback Aids. Presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, USA, 8-10 April. SPE-164122-MS. https://doi.org/10.2118/164122-MS.
Howard, P., Mukhopadhyay, S., Moniaga, N.. 2010. Comparison of Flowback Aids: Understanding Their Capillary Pressure and Wetting Properties. SPE Prod & Oper 25 (03): 376–387. SPE-122307-PA. https://doi.org/10.2118/122307-PA.
Liang, T., Achour, S. H., Longoria, R. A.. 2016. Identifying and Evaluating Surfactant Additives to Reduce Water Blocks after Hydraulic Fracturing for Low Permeability Reservoirs. Presented at the SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, USA, 11-13 April. SPE-179601-MS. https://doi.org/10.2118/179601-MS.
Liang, T., Longoria, R.A., Lu, J.. 2015. The Applicability of Surfactants on Enhancing the Productivity in Tight Formations. Presented at the Unconventional Resources Technology Conference, San Antonio, Texas, USA, 20-22 July. SPE-178584-MS. https://doi.org/10.15530/URTEC-2015-2154284.
Mahmoudkhani, A., O'Neil, B., Wylde, J.J.. 2015. Microemulsions as Flowback Aids for Enhanced Oil and Gas Recovery after Fracturing, Myth or Reality: A Turnkey Study to Determine the Features and Benefits. Presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, USA, 13-15 April. SPE-173729-MS. https://doi.org/10.2118/173729-MS.
Morsy, S., Zhou, J., Lant, K.. 2014. Optimizing Surfactant Additives for Enhanced Well Stimulation in Bakken Formation. Presented at the SPE International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, USA, 26-28 February. SPE-168180-MS. https://doi.org/10.2118/168180-MS.
Penny, G., Andrei Zelenev, A., Lett, N.. 2012. Nanofluid System Improves Post Frac Oil and Gas Recovery in Hydrocarbon Rich Gas Reservoirs. Presented at the SPE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 14-18 April. SPE-154308-MS. https://doi:10.2118/154308-MS.
Rostami, A., and Nasr-El-Din, H. A. 2014. Microemulsion vs. Surfactant Assisted Gas Recovery in Low Permeability Formations with Water Blockage. Presented at the SPE Western North American and Rocky Mountain Joint Regional Meeting, Denver, Colorado, USA, 16-18 April. SPE-169582-MS. https://doi.org/10.2118/169582-MS.
Shuler, P. J., Lu, Z., Ma, Q.. 2016. Surfactant Huff-n-Puff Application Potentials for Unconventional Reservoirs. Presented at SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, USA, 11-13 April. SPE-179667-MS. https://doi.org/10.2118/179667-MS.
Yue, Z., Peng, Y., He, K.. 2016. Multifunctional Fracturing Additives as Flowback Aids. Presented at the SPE Annual Technical Conference and Exhibition, Dubai, UAE, 26-28 September. SPE-181383-MS. https://doi.org/10.2118/181383-MS.
Zelenev, A. S. and Ellena, L. 2009. Microemulsion Technology for Improved Fluid Recovery and Enhanced Core Permeability to Gas. Presented at the 8th European Formation Damage Conference, Scheveningen, The Netherlands, 27-29 May. SPE-122109-MS. https://doi.org/10.2118/122109-MS.
Zelenev, A. S., Zhou, H., Ellena, L.. 2010. Microemulsion-Assisted Fluid Recovery and Improved Permeability to Gas in Shale Formations. Presented at the International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, USA, 10-12 February. SPE-127922-MS. https://doi.org/10.2118/127922-MS.