The rheological behaviour of a water-soluble polymer (HEC) used in drilling fluids

Ouaer, Hocine; Gareche, Mourad

doi:10.1007/s40430-018-1301-7

Cited by 25 publications

(15 citation statements)

References 26 publications

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“…The results show that the solutions are approximately Newtonian at low shear rates, followed by a shear thinning behaviour at high shear rates. Detailed explanation of these results can be found in Ouaer and Gareche [44]. The flow curves of HEC solutions are well fitted by the well-known Cross model [10], which is expressed by:…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 56%

“…A water-soluble polymer considered as a cellulose derivative, namely hydroxyethyl cellulose (HEC) of high molecular weight (~ 9.5 × 10 5 g/mol), was used as an additive to the bentonite suspensions for controlling the rheological behaviour of these suspensions. Detailed description of the HEC sample properties and uses can be found in Ouaer and Gareche [44].…”

Section: Methodsmentioning

confidence: 99%

“…where is the viscosity at any particular shear rate ( ̇ ), 0 is the zero shear viscosity, ∞ is the infinite shear viscosity, α is a characteristic constant of time and n is a dimensionless constant. These parameters are given in Table 2; and discussion can be found in Ouaer and Gareche [44].…”

Section: Rheological Properties Of Aqueous Hec Solutionsmentioning

confidence: 99%

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Hydroxyethyl cellulose as a rheology modifier for water-based drilling fluids formulated with Algerian bentonite

Ouaer

Gareche

2019

J Braz. Soc. Mech. Sci. Eng.

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Under the different geological conditions of wells and during the drilling operation, some of the water-based drilling fluid compositions are sometimes not efficient for the drilling success of the oil and gas wells (case of the Algerian oil and gas wells). In the use of bentonite in drilling fluid applications, the addition of hydroxyethyl cellulose (HEC) is recommended to obtain good rheological properties of the fluid. In this research, we investigate the rheological behaviour in steady state, and dynamic shear rheology of drilling fluids formulated based on an Algerian bentonite with a fixed concentration of 3 wt% and a water-soluble polymer HEC of high molecular weight (~ 9.5 × 10 5 g/mol) at different concentrations ranged from 0.02 to 0.2%. All the results obtained by a controlled stress rheometer have been commented by taking the interaction between the clay and the polymer molecules into consideration, to highlight the effect of HEC on the rheological properties of bentonite suspensions. Herschel-Bulkley (H-B) model was used to fit and interpret the experimental data. A significant increase in the rheological properties of the mixture bentonite-HEC with the increase in HEC concentration has been shown. These properties reached the maximum at HEC concentration of 0.1 wt%; beyond this value, they decreased. X-ray diffraction test performed on the different samples also allowed understanding the rheological behaviour of the system bentonite-HEC. Indeed, the HEC could intercalate the bentonite interlayer and formed link bridges between bentonite particles below a critical concentration of 0.1 wt%. Based on the results of the study, it is recommended to choose the optimum concentration of HEC to be added to the bentonite suspension to ensure the optimum rheological characteristics of the drilling fluids. Keywords Water-based mud • HEC • Algerian bentonite • Rheological properties • X-ray diffraction List of symbols Roman symbols G′ Storage modulus (Pa) G″ Loss modulus (Pa) G 0 Elastic modulus (Pa) k Consistency index (Pa s n) n Flow index w Pulsation (rad/s) Greek symbols α Time constant (s) Shear rate (s −1) λ X-ray wavelength (Å) 2θ Scattering angle Viscosity of the polymer solution (Pa s) 0 Zero shear rate viscosity (Pa s) ∞ Infinite shear rate viscosity (Pa s) τ Shear stress (Pa) τ c Yield stress (Pa)

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Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 56%

Section: Methodsmentioning

confidence: 99%

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Hydroxyethyl cellulose as a rheology modifier for water-based drilling fluids formulated with Algerian bentonite

Ouaer

Gareche

2019

J Braz. Soc. Mech. Sci. Eng.

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“…[8][9][10][11][12] Hydroxyethyl cellulose can be used as a thickener and a fluid loss reducer in drilling operations. [13] However, there are limits to application of hydroxyethyl cellulose at high temperatures due to the existence of ether bonds. [14] And the use of hydroxyethyl cellulose alone in the drilling fluid generally does not exceed 110℃.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyethyl Cellulose Acrylamide Graft Polymer-Bentonite Nanocomposites Synthesis, Characterization and Properties

et al. 2021

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Bentonite is the most important material used in oil and gas field drilling operations. However, the properties of natural bentonite cannot meet the requirements of bentonite for drilling. Therefore, researchers pay much attention to the modification of bentonite. The hydroxyethyl cellulose-acrylamide graft polymer was synthesized by microwave assisted, and the bentonite composite based on the graft polymer was prepared. FTIR, XRD and SEM results show that the polymer exists between the layers and the surface of the bentonite. Research on the bentonite composite showed that the yield point and filtration properties of bentonite composite are higher than natural bentonite at 90 to 150 celsius. The composite yield point / plastic viscosity ratio is more than 0.6 and the minimum fluid loss is only 9.3ml, which can meet the requirements of drilling-grade bentonite. This material has the potential to be a candidate for drilling applications.

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“…Koda et al [ 20 ] have compared the water retention capacity among MC, HeC, and hydroxypropyl cellulose (HpC) by using the compression method and differential scanning calorimetry measurements and concluded that the capacity of hydroxyethyl cellulose is the strongest. Ouaer et al [ 21 ] have determined the intrinsic viscosity and the critical overlap concentration of HeC molecules in aqueous solution. However, these studies were carried out at room temperature ca.…”

Section: Introductionmentioning

confidence: 99%

Hydration/Dehydration Behavior of Hydroxyethyl Cellulose Ether in Aqueous Solution

Arai

Shikata

2020

Molecules

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Hydroxyethyl cellulose (HeC) maintains high water solubility over a wide temperature range even in a high temperature region where other nonionic chemically modified cellulose ethers, such as methyl cellulose (MC) and hydroxypropylmethyl cellulose (HpMC), demonstrate cloud points. In order to clarify the reason for the high solubility of HeC, the temperature dependence of the hydration number per glucopyranose unit, nH, for the HeC samples was examined by using extremely high frequency dielectric spectrum measuring techniques up to 50 GHz over a temperature range from 10 to 70 °C. HeC samples with a molar substitution number (MS) per glucopyranose unit by hydroxyethyl groups ranging from 1.3 to 3.6 were examined in this study. All HeC samples dissolve into water over the examined temperature range and did not show their cloud points. The value of nH for the HeC sample possessing the MS of 1.3 was 14 at 20 °C and decreased gently with increasing temperature and declined to 10 at 70 °C. The nH values of the HeC samples are substantially larger than the minimum critical nH value of ca. 5 necessary to be dissolved into water for cellulose ethers such as MC and HpMC, even in a high temperature range. Then, the HeC molecules possess water solubility over the wide temperature range. The temperature dependence of nH for the HeC samples and triethyleneglycol, which is a model compound for substitution groups of HeC, is gentle and they are similar to each other. This observation strongly suggests that the hydration/dehydration behavior of the HeC samples was essentially controlled by that of their substitution groups.

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The rheological behaviour of a water-soluble polymer (HEC) used in drilling fluids

Cited by 25 publications

References 26 publications

Hydroxyethyl cellulose as a rheology modifier for water-based drilling fluids formulated with Algerian bentonite

Hydroxyethyl cellulose as a rheology modifier for water-based drilling fluids formulated with Algerian bentonite

Hydroxyethyl Cellulose Acrylamide Graft Polymer-Bentonite Nanocomposites Synthesis, Characterization and Properties

Hydration/Dehydration Behavior of Hydroxyethyl Cellulose Ether in Aqueous Solution

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