Making field-scale chemical EOR simulations a practical reality using dynamic gridding

Hussein Hoteit, Adwait Chawathé

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

Many IOR/EOR recovery processes such as chemical, miscible and steam flooding are often associated with complex flow mechanisms that manifest at the displacement front. Viscous fingering, polymer/surfactant dilution and mixing effects are some of these mechanisms. Accurate modeling of these phenomena requires simulations on high resolution grids to properly capture thephysics in the vicinity of thedisplacement front. Unfortunately high grid resolutions incur longer simulation times. Thus, past efforts at running full-field gas orChemical EOR simulations were frequently deemed impractical. The advancement in computational power from software, hardware and parallelism has indeed pushed the limits towards higher resolution simulations. However, this may not be practical in workflows that require simulations on many models to manage uncertainties. Dynamic gridding is one approach that attempts to adjust the grid resolution as needed during the run time. No a priori knowledge is assumed regarding the fluid flow pathways. The simulator can track the location of the displacement front, refine the neighborhood cells, and later coarsen them back as the front progresses. The advantage is reducing the number of grid-blocks, and therefore the computational time, compared to the fully refined grid, while preserving the fluid-flow physics. Although this technology is not new in reservoir simulation, there are persisting challenges in the existing methods related to the computational overhead associated with cell re-mapping, transmissibility re-calculation, and grid up-scaling and down-scaling. A new dynamic gridding functionality has successfully been implemented into our in-house simulator. The key achievements are: 1) eliminate grid re-mapping and transmissibility re-calculation at the run time, 2) capture heterogeneity associated with all levels of grid refinements, 3) model complex geology with non-uniform gridding, and 4) track multiple fronts associated with surfactant/polymer and chase water slugs. We discuss how we overcame the bottlenecks to leverage this technology from prototypes to complex cases. We also demonstrate our method on prototypes and pilot cases under CEOR recovery processes.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2014
Subtitle of host publicationDriving Integrated and Innovative EOR
PublisherSociety of Petroleum Engineers
Pages309-330
Number of pages22
ISBN (Print)9781632663184
DOIs
StatePublished - Jan 1 2014
EventSPE EOR Conference at Oil and Gas West Asia 2014: Driving Integrated and Innovative EOR - Muscat, Oman
Duration: Mar 31 2014Apr 2 2014

Publication series

NameSociety of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2014: Driving Integrated and Innovative EOR

Other

OtherSPE EOR Conference at Oil and Gas West Asia 2014: Driving Integrated and Innovative EOR
CountryOman
CityMuscat
Period03/31/1404/2/14

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Fingerprint

Dive into the research topics of 'Making field-scale chemical EOR simulations a practical reality using dynamic gridding'. Together they form a unique fingerprint.

Cite this