Extensional Viscosity of Polymer Based Fluids as a Possible Cause of Internal Cake Formation

Khan, Rafid; Kuru, Ergün; Tremblay, B.; Saasen, Arild

doi:10.1080/00908310600626630

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…Therefore, both the extensional and shear viscosities influence the flow behavior of polymer solutions in porous media. The extensional viscosity could be the main reason for the extra pressure drop of polymer solutions in porous media (Durst et al, 1987;Navarrete et al, 2000;Khan et al, 2007). For a Newtonian fluid, the extensional viscosity is three times of the shear viscosity (Jones et al, 1987).…”

Section: Rheological Characterization Of 3 Wt% Polyethylene Oxide Somentioning

confidence: 97%

“…Saasen (1990) showed the influence of elastic modulus (G') and viscous modulus (G") on the flow of polymer-based fluids through porous media. Extensional deformation of fluid elements in porous media amplifies the elastic effects (Khan et al, 2007). Svendsen et al (1998) showed the establishment of internal filter cake by coiled tubing drilling fluid with high extensional viscosity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of viscoelasticity on the filtration loss characteristics of aqueous polymer solutions

Dehghanpour

Kuru

2011

Journal of Petroleum Science and Engineering

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Section: Rheological Characterization Of 3 Wt% Polyethylene Oxide Somentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of viscoelasticity on the filtration loss characteristics of aqueous polymer solutions

Dehghanpour

Kuru

2011

Journal of Petroleum Science and Engineering

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“…XG solutions have higher values of shear viscosity, extensional thinning and elongational viscosity than HPAM solutions, which can generate smaller volumes of filtered for XG solutions and less depth of invasion in the porous medium (Khan et al 2007). XG solutions have higher values of shear viscosity, extensional thinning and elongational viscosity than HPAM solutions, which can generate smaller volumes of filtered for XG solutions and less depth of invasion in the porous medium (Khan et al 2007).…”

Section: Conceptsmentioning

confidence: 99%

Rheological Roles on the Dynamic Behavior of Drill-in Fluid Invasion and Oil Permeability Restoration of the Damage Zone

Moreno

Silveira

2013

All Days

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The formation damage caused by drilling fluid invasion around the wellbore reduces well productivity and changes the reservoir's original characteristics. In this context, drilling fluids specifically designed to perforate pay-zone, known as reservoir drill-in fluids, have been studied to optimize the drilling process and minimize formation damage. This work aimed to evaluate the brine-polymer drill-in fluids rheological behavior, invasion profiles of fluids and formation damage in carbonate and sandstone samples. For this purpose, polymer solutions was prepared using natural (XG) or synthetic (HPAM) polymers, solid-free or including CaCO 3 as bridging agent. Rheological and statistical analyses were performed. In addition, invasion lab tests at constant pressure, followed by oil backflow, were run to represent, respectively, the processes of an overbalanced drilling and a natural clean-up. The displacement tests were performed using carbonate and sandstone samples at connate water saturation and the results were compared. Through rheological evaluation and statistic analysis, the polymer and its concentration were confirmed as the main regulators of viscoelastic characteristics and consistency index for XG formulations, while the CaCO 3 addition caused significant changes only on HPAM formulations. The data of flow dynamics on carbonate samples pointed out that the oil productivity ratio (PR) was more reduced using XG fluid than HPAM one. This behavior was attributed to the higher elastic characteristics and consistency index of the fluid with XG, which provides higher flow resistance. These results were more significant when the CaCO 3 was added to the formulation, i.e., the formation of a filter-cake led to a complete reduction of PR. Comparing the influence of the rock matrix, HPAM fluids invasion was faster for the carbonate sample than for the sandstone one, possibly owing to differences in wettability and heterogeneity as mentioned in the literature. During the clean-up process, all samples showed oil permeability or productivity ratio restoration, but at different rates and cumulative oil volume flooding.

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Section: Introductionmentioning

confidence: 99%

“…Most commonly used EOR polymers are HPAM and are particularly sensitive to mechanical degradation (W. Littmann, 1988). Khan et al (2007) explained the elastic effects of extensional deformation of fluids in porous media. Detailed explanation of mechanism of chemical/mechanical and biological degradation of different polymers is given elsewhere (Sorbie, 1991) (Heemskerk et al, 1984).It is of prime importance to know the degradation behavior of polymers used in any polymer flood process.…”

Section: Introductionmentioning

confidence: 99%

Polymer Screening Criteria for EOR Application - A Rheological Characterization Approach

Veerabhadrappa

Urbissinova

Kuru

2011

SPE Western North American Region Meeting

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Polymer flooding has been the most widely used enhanced oil recovery technique in both sandstone and carbonate reservoirs. Ample polymer flooding projects have been conducted with different level of success ever since the technique was introduced 50 years ago. It is a usual practice to select a polymer based on viscosity range, concentration and molecular weight without getting into rheological characterization and its effect on oil recovery. However, in recent times the application of polymer flood has gained critical mechanistic insight with advancement in understanding the role of elasticity on sweep efficiency. Therefore, selecting the type of polymer and understanding how its fluid rheology affects oil recovery are probably among the most critical factors involved in designing a successful polymer flood job.To deal with this, a systematic approach for screening a polymer based on rheological characterization was adapted. Three different polymers, partially hydrolyzed polyacrylamide (HPAM) and Polyoxyethylene (PEO) were first used for fluid rheology study using a cone and plate rheometer and then for oil recovery through a special core holder designed to simulate radial flow through a sand pack -saturated with mineral oil.Effects of various rheological parameters such as; a) Newtonian vs. non-Newtonian rheology (constant shear viscosity vs. shear thinning), b) shear viscosity vs. elasticity, and c) average molecular weight vs. molecular weight distribution (polydispersivity) on oil recovery were investigated. Finally, a parametric characterization study was performed to develop a screening criteria and to correlate oil recovery prediction. The approach could lead to a successful screening process of polymer based on various characteristic parameters such as average molecular weight, polydispersity and Trouton ratio. IntroductionEOR polymers undergo chemical and/or mechanical degradation during the process of polymer flooding depending on the type of reservoir rock, reservoir fluids, reservoir temperature and pressure, injection rate etc. Most commonly used EOR polymers are HPAM and are particularly sensitive to mechanical degradation (W. Littmann, 1988). Khan et al. (2007) explained the elastic effects of extensional deformation of fluids in porous media. Detailed explanation of mechanism of chemical/mechanical and biological degradation of different polymers is given elsewhere (Sorbie, 1991) (Heemskerk et al., 1984.It is of prime importance to know the degradation behavior of polymers used in any polymer flood process. Laboratory investigations are essential for every particular flooding project in order to study the polymer behavior under different reservoir conditions.The study of rheological properties of polymers plays a vital role in the screening of polymers for any polymer flood operation. Rheological measurements and laboratory core floods carried out by Mojdeh et al. (2008) with HPAM polymers with very high molecular weights explains the role of their viscoelastic behavior in improving oil recovery...

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Extensional Viscosity of Polymer Based Fluids as a Possible Cause of Internal Cake Formation

Cited by 14 publications

References 12 publications

Effect of viscoelasticity on the filtration loss characteristics of aqueous polymer solutions

Effect of viscoelasticity on the filtration loss characteristics of aqueous polymer solutions

Rheological Roles on the Dynamic Behavior of Drill-in Fluid Invasion and Oil Permeability Restoration of the Damage Zone

Polymer Screening Criteria for EOR Application - A Rheological Characterization Approach

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