Rejuvenation of a Mature Tight Sandstone Oil Reservoir through Multistage Hydraulic Fracturing: A Case Study of a North African Basin

نوع مقاله : مقاله پژوهشی


1 School of Energy Engineering, University of Portsmouth, Portsmouth, UK

2 M.S. Graduate Student, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran

3 School of Engineering, University of Portsmouth, Portsmouth, UK


Development of mature oil fields has been increasingly attractive in recent years as a significant amount of world oil and gas production is being extracted from these formations. Hydraulic fracturing (either as a selective corrective stimulation method or as a preliminary completion approach) is a well-established technique in mature oil field rejuvenation to improve productivity and deliverability of such a diminishing field. After many years of successful production in A1 and A2 reservoirs, A3 and A4 reservoirs were developed with only one hydraulically fractured vertical well (Well #1). As the production from well #1 in A3/A4 reservoirs was below the expectation, the well was shut down after 3 years of production. Therefore, the main objective of this research paper is to investigate re-development options for A3/A4 reservoirs due to the low deliverability and productivity of the vertical well #1. Sensitivity analysis for history matching, critical conductivity, and optimum dimensionless fracture conductivity (Cfd) was performed followed by forecasting and multistage hydraulic fracturing. Numerical results showed that there is a critical conductivity beyond which production is insensitive to the conductivity, for a specific propped length and production time. Results also showed that critical conductivity increased with propped length and decreased with production time. After 25 years of forecasting, the recovery factor for the 900m lateral with eight fractures and 110m spacing was the highest at 2.65%. The corresponding values for the 300m and 600m laterals were 2.37% and 2.42%. Therefore, the study suggests that horizontal wells with a longer length and optimized number of fractures and spacing will provide maximum well recovery.


A Abdollahipour, M Fatehi Marji, H Soltanian, EA Kazemzadeh. (2018) Behavior of a hydraulic fracture in permeable formations. Journal of Mining and Environment 9 (4), 893-904.
A Abdollahipour, MF Marji, AY Bafghi, J Gholamnejad (2016) Time-dependent crack propagation in a poroelastic medium using a fully coupled hydromechanical displacement discontinuity method. International Journal of Fracture 199 (1), 71-87.
Chuang Liu, He Liu, YongPing Zhang, DaWei Deng, HengAn Wu. (2015) Optimal spacing of staged fracturing in horizontal shale-gas well. Journal of Petroleum Science and Engineering.
Cipolla, C.L., Loion, Mayerhofer, Warpinski. (2009) Fracture Design Considerations in Horizontal Wells Drilled in Unconventional Gas Reservoirs, paper SPE-119366, presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, 19-21 January.
Economides, M.J. Oligney, R. E. Valko, P.P. (2002) Unified Fracture Design. Texas: Orsa Press
Holditch, S.A.(2006) Tight Gas Reservoirs. Distinguished Author Article, Journal of Petroleum Technology, 84-90. June.
Jinzhou Zhao, Xiyu Chen, Yongming Li, Bin Fu. (2016) Simulation of simultaneous propagation of multiple hydraulic fractures in horizontal wells, Journal of Petroleum Science and Engineering.
K. Mukundakrishnan, K. Esler, D. Dembeck, V. Natoli. (2015) Accelerating Tight Reservoir Workflows with GPUs, SPE 173246
King G.E. (2014) 60 years of multi-fractured vertical deviated and horizontal wells. What Have we leaned? SPE 170952, Presented at the SPE Annual Technical Conference and Exhibition Apache Corporation
Le Heron,. (2005) Palaeogeography, Palaeoclimatology, Palaeoecology 218, pp 75-103.
Le Maux, T. Murat, B. Chauveau, A. Amamra, M. Mesdour, k. (2006) The Challenges of Building Up a Geological and Reservoir Model of a Late Ordovician Glaciomarine Gas Reservoir Characterised by the Presence of Natural Fractures (SPE 101208) .
Ma, Y. Z. (2015) Unconventional Resource Handbook: Elsevier.
Mark, Z. (2007) Reservoir geomechanics. Uk: Cambridge University Press.
Martin, A. N, Rylance M., (2010) Hydraulic Fracturing Makes the Difference: New life for old field, SPE127743.
Martin T. and Economides M.J. (2007) Modern Fracturing – Enhancing Natural Gas Production" ET Publishing, BJ Services, Gulf Publishing Co.
Ming Gue. Rafiee, M. Kulkarni, P. Ivarrud, E. Mohanty, K. (2016) Optimum Fracture Conductivity for Naturally Fractured Shale and Tight Reservoir, SPE 171648.
Norris, M. Berntsen, B. A. Skartveit, L.Teesedale, C. (1998) Multiple proppant fracturing of horizontal wellbores in chalk formation. SPE 50608.
Pearson, C.M. (2013) Hydraulic fracturing of horizontal wells. SPE distinguishes lecturer. http:/ well fracturing -03-13pdf downloaded 18 December 2016.
Pedro Saldungaray, Terry T. Palisch. (2013) Hydraulic Fracture Optimization in Unconventional Reservoirs, SPE 151128.
Quanshu Liu, Huilin Xing, Jianjun Liu, Xiangchon Liu. (2015) A review on hydraulic fracturing of unconventional reservoir, Science direct.
Rankin, R. Thibodeau, M. Vincent, M.C. Palisch, T. (2010) Improved production and profitability achieved with superior completion in horizontal wells. SPE 134595.
XiaoLong Wang, Chuang Liu, Han Wang, He Liu, HengAn Wu. (2016) Comparison of consecutive and alternate hydraulic fracturing in horizontal wells using XFEM-based cohesive zone method, Journal of Petroleum Science and Engineering.
Zou C. (2013) Unconventional Petroleum Geology: Elsevier.