Chemical EOR in High Salinity-High Temperature Reservoir - Experimental Coreflooding Tests and Numerical Simulation

Parracello, Valerio Parasiliti; Callegaro, Chiara; Dato, A.; Siliprandi, Francesco; Albonico, Paola; Mattei, M.

doi:10.3997/2214-4609.20142656

Cited by 5 publications

(3 citation statements)

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“…In single well chemical tracer tests, the delay of the partitioning EtAc tracer against the non-partitioning EtOH tracer is used to establish the oil saturation. Considering the delay P of EtAc, Pϭ(VEtAc-VEtoH)/VEtoH and K P the partitioning coefficient, the oil saturation is So ϭ P/(Pϩ K P ) directly linked to the volumes of tracers ( [6], [11]). …”

Section: Results and Interpretationmentioning

confidence: 99%

“…The estimated additional recover factor of SP slug compared to sea water injection gave about ϩ35%, evidence of the potentiality of the chemical process tailored for the field ( Figure 5). Moreover the coreflood test was history matched through numerical simulation to obtain the parameters of chemical description for future forecast scenarios ( [11]). …”

Section: Overview Of the Field And Eor Studymentioning

confidence: 99%

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Single Well Chemical Tracer Tests to Assess Low Salinity Water and Surfactant EOR Processes in West Africa

et al. 2014

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Assessing the residual oil saturation of different EOR techniques is of paramount importance to accurately select a suitable tertiary development and properly quantify remaining reserves in a given field. The Single Well Chemical Tracer Test (SWCTT) has proved to be a reliable technique to consistently measure the residual oil saturation in a representative formation volume.This work describes the design, operations and results of a sequence of three SWCTTs performed in a very heterogeneous and complex reservoir, on-shore in West Africa. The aim of the pilot tests is the evaluation of low salinity water and surfactant flood efficiency compared to current sea water injection. The EOR techniques were selected to improve the oil recovery factor in the field after an intensive experimental work and the effects were evaluated by means of simulation models.The SWCTTs were executed with cycles of injection, shut-in and production periods to measure the residual oil saturation after sea water, low salinity water and then surfactant injection to compare with experimental and simulation results. Favorable results were achieved for surfactant flooding with considerable reduction in residual oil, confirming that a performing surfactant mixture at harsh field condition was found. The SWCTT results showed, instead, a minor effect for low salinity water and the difference in core and field results were then investigated.A peculiar SWCTT program was executed to verify and compare the efficiency of two EOR methods at field conditions. Thanks to the encouraging surfactant results and the gained field experience, an extension of the EOR technique is under design in a cost-effective surfactant-polymer inter-well pilot. This assessment will provide optimization of chemical formulation in terms of compatibility, surfactant concentration, polymer viscosity and slug volumes.

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Section: Results and Interpretationmentioning

confidence: 99%

Section: Overview Of the Field And Eor Studymentioning

confidence: 99%

Single Well Chemical Tracer Tests to Assess Low Salinity Water and Surfactant EOR Processes in West Africa

et al. 2014

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“…However, the combined impact of chemical interactions, on-site management difficulties, and the associated high expenses present obstacles to the advancement of ASP flooding beyond polymer flooding. As a result, the exploration of a multifunctional single agent emerges as a promising avenue for enhancing oil recovery following polymer flooding [11]. The polysurfactant molecule, derived from acrylamide and modified polymer, incorporates functional groups such as amide and alkyl sulfonic acid.…”

Section: Introductionmentioning

confidence: 99%

Study on the Structure–Activity Relationship and Oil Displacement Characteristics of the Polysurfactant Agent

He,

Yuan,

Gan

et al. 2024

Polymers

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This study examines a versatile polymer known as polysurfactant, which is synthesized by co-polymerizing flexible acrylamide and sodium acrylate hydrocarbon chain. The polymer serves as a backbone and possesses active functional groups. Notably, the polysurfactant exhibits superior plugging and flooding abilities compared to conventional polymers. The primary objective of this paper is to investigate the properties and oil displacement characteristics of the polysurfactant through indoor physical simulation experiments. The results demonstrate that the multi-branched structure of the polysurfactant enhances its ability to associate, leading to the formation of a unique spatial network structure. The inclusion of multi-branched structures notably amplifies the association effect. The critical concentration for the association is estimated to be around 800 mg/L, at which juncture the polysurfactant exhibits a viscosity retention rate surpassing 90% subsequent to shearing. Furthermore, this spatial network structure exhibits self-recovery capabilities after experiencing shear failure and displaying strong viscosity and shear resistance. In addition, the concentration of the polysurfactant can control the hydrodynamic feature size, which shows its adaptability in regulation and oil-repelling functions at reservoir permeabilities ranging from 500 to 2000 × 10−3 μm2 with resistance coefficients ranging from 108 to 320. During the microscopic oil displacement process, the polysurfactant exerts a significant impact on mobility control, while the elastic pull clearly demonstrates a commendable viscoelastic oil displacement effect. The polysurfactant exhibits a specific degree of emulsification capability towards crude oil, leading to the emulsion exhibiting typical pseudoplastic fluid characteristics. The utilization of emulsification transportation and emulsification blockage contributes to the enhancement of oil recovery. As a result, the polysurfactant exhibits multifaceted capabilities, encompassing profile control, flooding, and plugging, owing to its unique structural characteristics. Through the implementation of a field test focused on flooding in the Daqing Oilfield, a significant enhancement in the recovery rate of 10.85% is observed, accompanied by a favorable input–output ratio of 1:3.86, thereby generating significant economic advantages.

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Numerical simulation of surfactant–polymer coreflooding experiments for carbonates

AlSofi

Liu

Han

et al. 2013

Journal of Petroleum Science and Engineering

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Chemical EOR in High Salinity-High Temperature Reservoir - Experimental Coreflooding Tests and Numerical Simulation

Cited by 5 publications

References 0 publications

Single Well Chemical Tracer Tests to Assess Low Salinity Water and Surfactant EOR Processes in West Africa

Single Well Chemical Tracer Tests to Assess Low Salinity Water and Surfactant EOR Processes in West Africa

Study on the Structure–Activity Relationship and Oil Displacement Characteristics of the Polysurfactant Agent

Numerical simulation of surfactant–polymer coreflooding experiments for carbonates

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