The Effect of Different Drilling Fluids on Mechanical Friction

Ytrehus, Jan David; Taghipour, Ali; Golchin, Arash; Saasen, Arild; Prakash, Braham

doi:10.1115/1.4035951

Cited by 25 publications

(6 citation statements)

References 21 publications

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“…e results show that an additional axial excitation can effectively suppress stick-slip vibration [16]. Ytrehus et al propose that the friction between drillstring and borehole wall is dependent on the physical property of drilling slurry [17].…”

Section: Introductionmentioning

confidence: 98%

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Dynamic Model and Quantitative Analysis of Stick-Slip Vibration in Horizontal Well

Wang

Ren

2020

Shock and Vibration

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Stick-slip is very harmful to the service life of drillstring. The extended Hamilton principle is applied in the paper. Then, finite element method (FEM) is employed to describe the model. The drillstring-borehole impact and friction, fluid-structure interaction, bit-rock interaction, and gravity are considered in this model. The influence of axial and torsional excitation on stick-slip is analyzed. The nonlinear motion predicted by the model is consistent with the observation results in the experiments. The research shows that the fluctuation amplitude of the bit angular velocity also increases along with the increase of driving angular velocity (torsional excitation). However, both the ratio of the maximum angular velocity of the stick-slip vibration and the fluctuation of the angular velocity are continuously reduced. Meanwhile, the strength of the stick-slip vibration has a tendency to slow down. As the axial load (axial excitation) increases, the fluctuation of the maximum angular speed of the stick-slip vibration does not change significantly, but the smaller load causes a smaller stick duration.

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Section: Introductionmentioning

confidence: 98%

“…In some researches, slurry is taken into account in the models [15][16][17]. Ertas et al develop a general dynamical model of drillstring taking into account the viscosity of slurry [15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model and Quantitative Analysis of Stick-Slip Vibration in Horizontal Well

Wang

Ren

2020

Shock and Vibration

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“…Drilling fluids are essential for a variety of reasons, including carrying drilled cuttings to the surface, cleaning, cooling and lubricating the drilling bit, reducing friction and maintaining borehole integrity [ 1 , 2 , 3 , 4 , 5 ]. Using the appropriate drilling fluid is a crucial part of any successful drilling operation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Rheological Behavior of an Oil-Based Drilling Fluid with Rheology Modifier and Oil Wetter Additives

et al. 2021

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Drilling issues such as shale hydration, high-temperature tolerance, torque and drag are often resolved by applying an appropriate drilling fluid formulation. Oil-based drilling fluid (OBDF) formulations are usually composed of emulsifiers, lime, brine, viscosifier, fluid loss controller and weighting agent. These additives sometimes outperform in extended exposure to high pressure high temperature (HPHT) conditions encountered in deep wells, resulting in weighting material segregation, high fluid loss, poor rheology and poor emulsion stability. In this study, two additives, oil wetter and rheology modifier were incorporated into the OBDF and their performance was investigated by conducting rheology, fluid loss, zeta potential and emulsion stability tests before and after hot rolling at 16 h and 32 h. Extending the hot rolling period beyond what is commonly used in this type of experiment is necessary to ensure the fluid’s stability. It was found that HPHT hot rolling affected the properties of drilling fluids by decreasing the rheology parameters and emulsion stability with the increase in the hot rolling time to 32 h. Also, the fluid loss additive’s performance degraded as rolling temperature and time increased. Adding oil wetter and rheology modifier additives resulted in a slight loss of rheological profile after 32 h and maintained flat rheology profile. The emulsion stability was slightly decreased and stayed close to the recommended value (400 V). The fluid loss was controlled by optimizing the concentration of fluid loss additive and oil wetter. The presence of oil wetter improved the carrying capacity of drilling fluids and prevented the barite sag problem. The zeta potential test confirmed that the oil wetter converted the surface of barite from water to oil and improved its dispersion in the oil.

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“…Drilling fluids play a significant role in drilling operations as the success and failure of drilling are primarily based on the selection of drilling fluids. The type and composition of drilling fluids are vital elements to serve many purposes such as carrying drilled cuttings to the surface, cleaning, cooling, and lubrication of the drilling bit, reducing friction, maintaining the borehole integrity, making a thin and low permeable filter cake, and preventing gas or oil kicks from prematurely flowing into the wellbore. − Two common types of drilling fluids used in oil and gas drilling operations that differ in application and composition are oil-based drilling fluids (OBDFs) and water-based drilling fluids (WBDFs). WBDFs are cheaper and environmentally friendly, but they have limitations such as their application in high-pressure high-temperature (HPHT) wells and shale-bearing formations.…”

Section: Introductionmentioning

confidence: 99%

Application of Anhydrous Calcium Sulfate as a Weighting Agent in Oil-Based Drilling Fluids

et al. 2021

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The hydrostatic pressure exerted during the drilling operation is controlled by adding a weighting agent into drilling fluids. Various weighting materials such as barite, calcium carbonate, hematite, and ilmenite are used to increase the density of drilling fluids. Some weighting additives can cause serious drilling problems, including particle settling, formation damage, erosion, and insoluble filters. In this study, anhydrite (calcium sulfate) is used as a weighting additive in the oil-based drilling fluid (OBDF). Anhydrite is an abundantly available resource used in the preparation of desiccant, plaster of Paris, and Stucco. Anhydrite application in drilling fluids is discouraged because of its filter cake removal issue. This study investigated anhydrite (anhydrous CaSO 4 ) as a weighting agent and its filter cake removal procedure for OBDFs. The anhydrite performance as a weighting agent in OBDFs was evaluated by conducting several laboratory experiments such as density, rheology, fluid loss, and electrical stability and compared with that of commonly used weighting materials (barite, calcium carbonate, and hematite). The anhydrite was mixed in three different concentrations (62, 124, and 175 ppb) in a base-drilling fluid. The results showed that calcium sulfate enhanced rheological parameters such as plastic viscosity, yield point, apparent viscosity, and gel strength. CaSO 4 reduced the fluid loss and provided better control over the fluid loss than other tested weighting materials tested at the same concentration of 124 ppb. Similarly, the emulsion stability was decreased with the increase in the amount of calcium sulfate in the OBDF. The calcium sulfate filter cake can be removed easily from the wellbore with an efficiency of 83 to 91% in single-stage and multistage removal processes, respectively using the newly developed formulation consisting of 20 wt % potassium salt of glutamic acid-N,N-diacetic acid (K 4 GLDA) as a chelating agent, 6 wt % potassium carbonate, and 10% ethylene glycol monobutyl ether. The introduction of anhydrite as a weighting agent can be more beneficial for both academia and industry.

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The Effect of Different Drilling Fluids on Mechanical Friction

Cited by 25 publications

References 21 publications

Dynamic Model and Quantitative Analysis of Stick-Slip Vibration in Horizontal Well

Dynamic Model and Quantitative Analysis of Stick-Slip Vibration in Horizontal Well

Experimental Investigation of the Rheological Behavior of an Oil-Based Drilling Fluid with Rheology Modifier and Oil Wetter Additives

Application of Anhydrous Calcium Sulfate as a Weighting Agent in Oil-Based Drilling Fluids

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