Experimental Investigations Into the Performance of a Flat-Rheology Water-Based Drilling Fluid

Xu, Lin; Xu, Mengque; Zhao, Lin; Wen, Shou Cheng; Liu, Wei Hong; Xu, Jie; You, Fu Chang; Gong, Cheng

doi:10.2118/163107-pa

Cited by 13 publications

(4 citation statements)

References 4 publications

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“…Several investigators have used the API Bingham Yield stress for the analysis of thermal stability drilling fluid [ 40 , 41 , 42 ]. The Bingham plastic model is described by plastic viscosity and yield stress as: [ 38 ].…”

Section: Methodsmentioning

confidence: 99%

MoS2 Nanoparticle Effects on 80 °C Thermally Stable Water-Based Drilling Fluid

2021

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Bentonite-based drilling fluids are used for drilling, where inhibitive fluids are not required. The rheological and the density properties of the drilling fluids are highly affected by high temperature and pressure. Due to high temperature, the clay particles stick together, and the fluid system becomes more flocculated. Poorly designed drilling fluid may cause undesired operational issues such as poor hole cleaning, drill strings sticking, high torque and drag. In this study, the 80 °C thermally stable Herschel Bulkley’s and Bingham plastic yield stresses drilling fluids were formulated based on lignosulfonate-treated bentonite drilling fluid. Further, the impact of a MoS2 nanoparticle solution on the properties of the thermally stable base fluid was characterized. Results at room temperature and pressure showed that the blending of 0.26 wt.% MoS2 increased the lubricity of thermally stable base fluid by 27% and enhanced the thermal and electrical conductivities by 7.2% and 8.8%, respectively.

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Section: Methodsmentioning

confidence: 99%

MoS2 Nanoparticle Effects on 80 °C Thermally Stable Water-Based Drilling Fluid

2021

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“…These problems can easily lead to major incidents, such as formation fractures, loss of solution at the casing shoe, and more serious well leaks. The concept of “flat rheology” has been developed for deepwater drilling fluid applications to address such problems [ 20 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…This concept, which aims to effectively control equivalent circulating density (ECD) and reduce drilling fluid losses, refers to maintaining a relatively constant apparent viscosity, plastic viscosity, yield value, and θ6, θ3 readings over a temperature range of 4–65 °C [ 23 , 24 , 25 , 26 ]. The definition of ‘flat rheology’ is mostly determined by measuring the ratio of the apparent viscosity, plastic viscosity, and yield value of the drilling fluid at different temperature points [ 23 , 24 , 25 , 26 ]. Temperature points are usually chosen from 4, 25, and 65 °C.…”

Section: Introductionmentioning

confidence: 99%

“…In dispersion systems, the influence of the dispersion medium on the viscosity of the system is significant. The base oils commonly used in oil-based and synthetic-based drilling fluids are strongly influenced by temperature variations [ 23 , 24 , 25 , 26 ]. To address such problems, scholars have developed new mineral oils or biodiesels with low temperature and low viscosity properties as base oils [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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A Temperature-Sensitive Polymeric Rheology Modifier Used in Water-Based Drilling Fluid for Deepwater Drilling

Wang

Sun

Zhang

et al. 2022

Gels

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Rheology modifiers are essential for the flat rheology of water-based drilling fluids in deepwater. The low temperature thickening of deepwater water-based drilling fluids results in dramatic rheological changes in the 20–30 °C range. To address such problems, NIPAM with a self-polymerized product LCST of 32–35 °C was selected as the main body for synthesis. While introducing the hydrophilic monomer AM to enhance the thickening properties, the hydrophobic monomer BA was selected to reduce the LCST of the product. In this paper, a temperature-sensitive polymeric rheology modifier (PNBAM) was synthesized by emulsion polymerization using N-isopropyl acrylamide, acrylamide, and butyl acrylate as monomers. The PNBAM was characterized using infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and nuclear magnetic resonance hydrogen spectroscopy (NMR). The rheological properties, temperature resistance, and salt resistance of PNBAM in the base fluid (BF) were tested. The performance of PNBAM in the drilling fluid system was also evaluated, and a water-based drilling fluid system of flat rheology for deepwater was formulated. The rheological modification mechanism of PNBAM was analyzed by turbidity analysis, particle size analysis, and zeta analysis. Experimental results show that PNBAM has good rheological properties. PNBAM is temperature resistant to 150 °C, salt-resistant to 30 wt%, and calcium resistant to 1.0 wt%. PNBAM also has good flat rheology characteristics in drilling fluid systems: AV4°C:AV25°C = 1.27, PV4°C:PV25°C = 1.19. Mechanistic analysis showed that the LCST (Lower Critical Solution Temperature) of 0.2 wt% PNBAM in an aqueous solution was 31 °C. Through changes in hydrogen bonding forces with water, PNBAM can regulate its hydrophilic and hydrophobic properties before and after LCST, which thus assists BF to achieve a flat rheological effect. In summary, the temperature-sensitive effect of PNBAM has the property of enhancing with increasing temperature. While the tackifying effect of conventional rheology modifiers diminishes with increasing temperature, the temperature-sensitive effect of PNBAM gives it an enhanced thickening effect with increasing temperature, making it a more novel rheology modifier compared to conventional treatment additives. After LCST, compared to conventional rheology modifiers (XC), PNBAM has a more pronounced thermo-thickening effect, improving the main rheological parameters of BF by more than 100% or even up to 200% (XC less than 50%). This contributes to the flat rheology of drilling fluids. PNBAM has good application prospects and serves as a good reference for the development of other rheology modifiers.

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