[CCoE Notice] Thesis Announcement: Diagnostic Analysis Approach to Evaluate Production Performance and IOR/EOR Screening of Mature Reservoirs

[Grayson, Audrey A]

Diagnostic Analysis Approach to Evaluate Production Performance and IOR/EOR Screening of Mature Reservoirs



Anisha Deka Masters’ Thesis Dissertation



Defense Date: Thursday, August 2nd, 2018 Time: 12:30 pm Location: Room 124, ERP Building 9

Committee Members: Dr. Ganesh Thakur, Dr. Mohamed Soliman and Dr. Guan Qin



An oil and gas reservoir goes through different stages throughout its life: primary, secondary, tertiary. In order to obtain maximum oil from any reservoir, it is crucial to examine and to manage the reservoir throughout its life. Historically, engineers used to start managing a reservoir only after the break through of oil and gas, or after the start of a secondary process, example: water flooding. But a sound reservoir management depends on monitoring a field since it starts producing and it is necessary to have an ongoing evaluation.  Reservoir management involves the use of technology to minimize capital investments and operating expenses, and to maximize recovery of oil and gas from a reservoir.

            The thesis demonstrates a novel screening workflow and methodology that identifies reservoir candidates for improved oil recovery/ enhanced oil recovery (IOR/EOR) methods. This novel screening workflow integrates rigorous analysis of production/injection data with understanding of reservoir geology and petrophysics.

Initial reservoir screening using average rock and fluid properties is followed by an advanced EOR screening method. The methodology is applied successfully to a large collection of conventional reservoirs. Candidates are selected for suitable IOR/EOR methods that improve volumetric sweep, reduce oil saturation and recover bypassed oil.

Result from the preliminary reservoir screening is shared followed by an extensive study of the reservoir performance of two selected candidates (reservoirs:  N263 and N17+128D). This is done with the aim to study the production performance and identify areas of improvement. Comprehensive production analysis using classical reservoir engineering plots are presented to evaluate and validate the water flood performance. The recommendation of water flood management strategy and EOR strategy is then developed for reservoirs, N263 and N17+128D.

The advanced integrated IOR/EOR screening workflow and methodology therefore incorporates geological aspects along with static, dynamic, and operational parameters, which is appropriate for a large number of reservoirs under consideration. These insights, evolved from practical field experience, are beneficial for recovering bypassed oil, revitalizing mature water floods through effective reservoir management, and more importantly the design and implementation of suitable EOR pilots.





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