Key Learnings from Re-Development Activity and Waterflood EOR of Mature Brown Field: Heterogeneous Compartmentalized Reservoir Case Study, Western Desert, Egypt

Abstract

In this research an integrated reservoir study was performed on one of the successful water flood projects in Bapetco; The NE-Abu Gharadig-1 field which passes through a several phases of development started with appraisal and delineation, initial development (fast track), re-development phase and last phase of reservoir simulation. The conducted field re-development activities increase the EOR expectations and tackle the remaining reservoir potential. Until the moment 58 wells were drilled in this field 29 oil producer, 26 water injector and 3 water source wells. Different accumulations and segments were interpreted; these segments did not indicate full communication as the thinly bedded Bahariya sequence of 200 meter thickness shows a wide range of reservoir properties and heterogeneity including porosity, permeability and hydrocarbon saturation. Geo-cellar modeling approach was beneficial in this field in order to link the static and dynamic data until reaching a certain level of match and harmony. Twelve productive zones were interrelated through an attempt to construct structural and stratigraphic facies distribution framework guided by cores and BHI. The 3D geo-cellar modeling was applied to the probable cases and prospective blocks. Petrel data analysis tool was activated in order to control the probability distribution in property modeling. Further reservoir simulator was used to incorporate the engineering data as pressure and production; therefore optimal development strategies are aligned with the findings and forecasts of each reservoir sector. The results indicate a massive variation in vertical and lateral OIIP distribution and URF which is ranging from 16 % to 40 % on the best chances; this variance controlled by the reservoir architecture, compartmentalization, reservoir rock types, relative permeability curves, minor faults and fractures associated with different stress regimes. The WF pattern fitting and placement were optimized to overcome the geological constrains by additional two phases of infill wells. The results provides a robust reserves stair case through a multi-phases of development and modeling to increase the field production life, improve pattern flood, optimize enhanced recovery and smooth operation.

Challenges of a mature Russian field's redevelopment – Advantages and disadvantages of quick-look geologic modeling

“…Similar redevelopment efforts took place worldwide (O'Brian et al, 2016). A few examples are from Russia (Golovatskiy et al, 2015), India (Sarkar et al, 2015;Tiwari et al, 2015), Indonesia (Waskito et al, 2015), Malaysia (Ng et al, 2016), Australia (Mantopoulos et al, 2015), Egypt (El-Bagoury et al, 2017), China (Rajput et al, 2015), among many others.…”

Integrated petrophysical study to validate water saturation from well logs in Bahariya Shaley Sand Reservoirs, case study from Abu Gharadig Basin, Egypt

“…The Neag-1 field was investigated before by many authors ElBelisy et al 2010;El-Bagoury et al 2017;El Sayed et al 2019). Fit for purpose reservoir modeling for the geological uncertainties as., structure and stratigraphy was done for Bahariya reservoirs (Fault block compartmentalization, Fault sealing, sub-seismic faults, net reservoir, hydrocarbon saturation) by to propose a fast track strategy for early field development.…”