A Critical Literature Review of Laboratory and Field Scale Determination of Residual Oil Saturation

Teklu, Tadesse Weldu; Brown, Jeffrey S.; Kazemi, Hossein; Graves, Ramona M.; AlSumaiti, Ali M.

doi:10.2118/164483-ms

Cited by 18 publications

(7 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a result, a significant amount of oil ends up unrecovered in porous media which results in an oil recovery factor typically less than 50% (Teklu et al 2013). This barrier is even more significant in carbonate reservoirs compared to sandstone reservoirs because of the wettability of carbonate rock which is more mixed-or oil-wet.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of surfactant flooding using interwell tracer analysis

Khaledialidusti

Kleppe

Enayatpour

2016

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

Surfactant flooding is an important enhanced oil recovery (EOR) method, especially in carbonate oil reservoirs where water flooding may not have an effect on oil recovery as much as for sandstone reservoirs. This is because of the initial wettability of most carbonate reservoirs that is mixed-or oil-wet. Since surfactant flooding has a great impact on both fluid-fluid and rock-fluid interactions, it can be an efficient EOR method for these kinds of reservoirs. Surfactants affect fluid-fluid interactions by reducing interfacial tension (IFT) between water and oil phases and rock-fluid interactions by wettability alteration. The objective of this paper is the evaluation of these two surfactant mechanisms in non-fractured carbonate reservoirs using UTCHEM, the University of Texas chemical compositional simulator. In this paper, first, the laboratory data of two surfactant spontaneous imbibition tests for carbonate cores are successfully matched with modeled data to evaluate the mechanisms of surfactant flooding. Second, the field-scale surfactant flooding is simulated using the experimental data from spontaneous imbibition tests. Several cases are modeled in order to study the effect of surfactant flooding in terms of decreasing IFT and wettability alteration. Since the formation brine salinity in most reservoirs is more than the optimum salinity of surfactant phase behavior, the benefit of combining surfactant and low-salinity water is also investigated. Finally, tracer test simulation is performed to estimate the average oil saturation within the swept pore volume at the end of each recovery mode.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of surfactant flooding using interwell tracer analysis

Khaledialidusti

Kleppe

Enayatpour

2016

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…In both laboratory and field studies, their physical and chemical efficiencies (i.e., stability under reservoir conditions and lower reactivity) were demonstrated, illustrating their regular use in the oil industry since the 20th century [17,18]. However, the key issue faced by the oil industry is the low availability of chemical water tracers [18,19,20,21], and also due to the potential memory effects, the same tracers cannot be reused in the same reservoir. [8] This prevents the reuse of tracers in fields that have already been examined in the same reservoir.…”

Section: F I G U R E 1 Schematic Of Interwell Tracing Testmentioning

confidence: 99%

Advances in the analytical methods for the determination of fluorinated aromatic carboxylic acids in aqueous matrices: A review

Kumar

Sharma

2021

J of Separation Science

View full text Add to dashboard Cite

Fluorobenzoic acids are critically important chemical tracers in hydrothermal, geothermal, leaching, and oilfield applications. Particularly in oilfield applications, these tracers are used to investigate fluid flow paths between injector wells and producer wells, providing valuable information about the enhanced oil recovery process of the oil reservoirs. The detection limit of tracers is a vital subject in field reservoir work because the amount of chemical tracer that must be injected into the injector well is directly related to the amount detected at the producer well after migration and diffusion. The popularity of fluorinated benzoic acids as the tracers is due to their non-toxicity over radioactive tracers and low detection limit, which is determined using analytical techniques. This review focuses on the improvements/developments in extraction techniques such as solid-phase extraction and determination techniques such as gas chromatography coupled with mass spectrometry, liquid chromatography with mass spectrometry, isotope dilution gas chromatography-mass spectrometry, high-performance liquid chromatography, ion chromatography coupled with electrospray mass spectrometry, and so on for the analysis of fluorinated benzoic acids to achieve the lowest possible limit of concentration.

show abstract

“…Several methods are available to estimate S orw at different scales, ranging from analogues, SCAL studies, well logging, single well tracer tests (SWTT) and partitioning inter-well tracer tests (Dean et al, Tang 1995, Teklu et al 2013, Khalediallidusti et al 2014.…”

Section: Single Well Tracer Test (Swtt)mentioning

confidence: 99%

The Value of Inter-well and Single Well Tracer Technology for De-Risking and Optimizing a CEOR Process - Caracara Field Case

et al. 2015

View full text Add to dashboard Cite

Recent advances in tracer technology deliver accurate data in a cost-efficient manner. Tracer applications typically aim to improve reservoir description by solving connectivity questions, to evaluate and derisk the potential for secondary and tertiary recovery processes, along with inflow profiling and allocation of injected water or gas.A previous paper (SPE-164930) presented the strategy and planning of a chemical EOR (CEOR) process for sandstone reservoirs of the Caracara Sur Field, Colombia. The project is moving forward and laboratory studies have been successfully completed to define an optimum alkaline surfactant polymer (ASP) formulation. Along with simulation studies, comprehensive inter-well (IWTT) and single well tracer tests (SWTT) have been carried out to provide valuable input to understand aquifer drift, the reservoir flooding process and to analyse residual oil saturations to waterflood (S orw ). This paper presents these two tracer applications:• IWTTs were performed in Caracara Sur sandstone reservoir zones to characterize aquifer drift.Tracer response was used as input for analysing the implications of chemical dilution by the aquifer and also as an input for history matching, resulting in a more reliable reservoir model. • The results of the first SWTT in Caracara Sur Field (and -to our knowledge -in Colombia), are presented. By measuring S orw , the potential for CEOR application has been confirmed.An ASP one-spot test has subsequently been completed and followed-up by a second SWTT to evaluate the efficiency of the chemical formulation. Results are currently under evaluation but appear favourable. Planning for expanded use of CEOR in Caracara Sur continues. Lessons learnt and best practices for implementing tracer technology in similar fields include:• Use of tracer backflow tests (TBFT) to derisk SWTTs; also the use of FBA passive tracers. • Planning, operating and analysing the results of tracer-tests in-house rather than sub-contracting to third parties increases flexibility, increases internal knowledge and is cost-effective.

show abstract

A Critical Literature Review of Laboratory and Field Scale Determination of Residual Oil Saturation

Cited by 18 publications

References 35 publications

Evaluation of surfactant flooding using interwell tracer analysis

Evaluation of surfactant flooding using interwell tracer analysis

Advances in the analytical methods for the determination of fluorinated aromatic carboxylic acids in aqueous matrices: A review

The Value of Inter-well and Single Well Tracer Technology for De-Risking and Optimizing a CEOR Process - Caracara Field Case

Contact Info

Product

Resources

About