Experimental and numerical simulation of cuttings transportation in coiled tubing drilling

Kamyab, Mohammadreza; Rasouli, Vamegh

doi:10.1016/j.jngse.2015.11.022

Cited by 45 publications

(11 citation statements)

References 22 publications

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“…Duan et al (2008) observed that with polymeric drilling fluids and combined with drillpipe rotation, smaller cuttings are easier to transport in horizontal wellbore, and the transport efficiency of small cuttings (0.45 mm) is nearly twice as high as that of large cuttings (1.4 mm and 3.3 mm). Kamyab and Rasouli (2016) observed that small cuttings (smaller than 0.42 mm) have much Edited by Yan-Hua Sun higher transport efficiency in the drilling fluids with high viscosity in horizontal wellbore than that of large cuttings (2.36 mm and 4.7 mm). Hakim et al (2018) reported that the highest cuttings transport efficiency for 5% concentration of water-based mud polypropylene in horizontal wellbore was recorded at approximately 96% for cutting sizes of 0.50-0.99 mm in six different sizes of drilled cuttings ranging from 0.5 to 4.0 mm.…”

Section: Introductionmentioning

confidence: 96%

Numerical and experimental investigation on the depressurization capacity of a new type of depressure-dominated jet mill bit

Chen

Cao

et al. 2020

Pet. Sci.

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Efficient cuttings transport and improving rate of penetration (ROP) are two major challenges in horizontal drilling and extended reach drilling. A type of jet mill bit (JMB) may provide an opportunity to catch the two birds with one stone: not only enhancing cuttings transport efficiency but also improving ROP by depressuring at the bottom hole. In this paper, the JMB is further improved and a new type of depressure-dominated JMB is presented; meanwhile, the depressurization capacity of the depressure-dominated JMB is investigated by numerical simulation and experiment. The numerical study shows that low flow-rate ratio helps to enhance the depressurization capacity of the depressure-dominated JMB; for both depressurization and bottom hole cleaning concern, the flow-rate ratio is suggested to be set at approximately 1:1. With all other parameter values being constant, lower dimensionless nozzle-to-throat-area ratio may result in higher depressurization capacity and better bottom hole cleaning, and the optimal dimensionless nozzle-to-throat-area ratio is at approximately 0.15. Experiments also indicate that reducing the dimensionless flow-rate ratio may help to increase the depressurization capacity of the depressure-dominated JMB. This work provides drilling engineers with a promising tool to improve ROP.

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Section: Introductionmentioning

confidence: 96%

Numerical and experimental investigation on the depressurization capacity of a new type of depressure-dominated jet mill bit

Chen

Cao

et al. 2020

Pet. Sci.

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“…For vertical wells, cutting lifting can typically proceed without any difficulties, but for a deviated well, there are difficulties in transporting the cuttings because they may accumulate, forming either a stationary bed at hole angles greater than 50° or a moving bed at lower angles (Williams and Bruce 1951). Hence, the seriousness of cutting lifting varies depending on the amount and the location of cuttings distributed along the wellbore (Clark and Bickham 1994;Egenti 2014;Hareland et al 1993; Kamyab and Rasouli 2016;Nazari et al 2010;Pang et al 2019;Zeng et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

The effect of drill–pipe rotation on improving hole cleaning using polypropylene beads in water-based mud at different hole angles

Katende

Segar

Ismail

et al. 2019

J Petrol Explor Prod Technol

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Hole cleaning is always a problem, particularly during drilling operations, and drilling fluid plays an important role in transporting drill cuttings through an annular section of wellbore to the surface. To transport the cuttings, a water-based mud with added polypropylene beads was selected since it is environmentally friendly and cost efficient. The polypropylene beads help to transport cuttings by providing an additional buoyancy force that lifts the cuttings to the surface via the influence of collision and drag forces. This experiment was performed using a 20 ft test section, 10 ppg drilling mud and 0.86 m/s annular velocity in a laboratory scale rig simulator, and the concentration of polypropylene beads was varied from 0 to 8 ppb. As the concentration of polypropylene increases, the cutting transport ratio also increases. It was observed that the fewest cuttings are lifted at a critical angle of 60°, followed by 45°, 30°, 90° and 0°. Additionally, cutting sizes had moderate effects on the cutting lifting efficiency, where smaller cutting sizes (0.5-1.0 mm) are easier to lift than larger cutting sizes (2.0-2.8 mm). Furthermore, a study of buoyancy force and impulsive force was conducted to investigate the cutting lifting efficiencies of various concentrations of polypropylene beads. This lifting capacity was also assisted by the presence of polyanionic cellulose (PAC), which increases the mud carrying capacity and is effective for smaller cuttings. The results show that in the presence of pipe rotation, the cutting lifting efficiency is slightly enhanced due to the orbital motion provided by the drill pipe for better hole cleaning. In conclusion, polypropylene beads combined with pipe rotation increase the cutting transport ratio in the wellbore.

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“…5 Since the investigation and study of the effective drilling characteristics on the bottom hole on a drilling rig is costly, researchers have attempted to study this subject with a variety of approaches such as flow loops and Computational Fluid Dynamics (CFD). 6,7 Usually the cutting concentration, mean bed height and the length of the bed are the main variables that are traced for hole-cleaning efficiency across the annulus. 8,9 Cutting transport phenomenon can be considered as a liquid-solid system in CFD modelling.…”

Section: Introductionmentioning

confidence: 99%

A Liquid-Solid Two-phase Flow Computational Fluid Dynamic Modelling of the Operational Characteristics Effects on the Cleaning Time of a Circulating Flow Loop

Dehvedar¹,

Moarefvand²,

Kiyani³

2019

S.Afr.j.chem.

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Flow loops and computational fluid dynamics are the main research approaches for resolving the hole-cleaning problems. Cutting transport phenomena can be considered as a Computational Fluid Dynamic (CFD) model by using Eulerian assumptions for the turbulent liquid-solid flow in concentric annuli. The effect of time along with the main operational characteristics on the hole-cleaning phenomena is not negligible but recent studies have had paid little attention to it. Poor near bit cleaning causes many problems such as bit balling, decline in the rate of penetration, pipe sticking, etc. In addition to the effect of inclination, drill pipe rotary speed, cutting size, nozzle velocity and fluid viscosity as well as the effect of the bit nozzle arrangement on the cutting transport process were discussed. The results demonstrate that at a critical inclination angle of 30 degrees the cutting transport is inefficient. For all sections, the effect of drill pipe rotary speed was negligible at high velocities. In the horizontal section, at low flow rates and high drill pipe rotation speeds, Newtonian viscous fluids or water has no effect on the time needed for initial holecleaning but by removing the drill pipe rotation speed in similar conditions, a dramatic influence on time is observed. In inclined annuli, increasing the cuttings size and decreasing the nozzle velocity result in having no cutting in the output. Under critical inclination (30 degrees) the effect of the nozzle angle pattern on the hole-cleaning time is negligible. However, for a vertical annulus, the nozzle angle significantly influences the cutting transport. The best performance is obtained when the nozzle angle was perpendicular to the drill pipe axes. Figure 1 (a) Flow Loop sketch and its similarity with a real well. Four nozzles (b) and cutting inlet were located on the right-hand side and one outlet was located on the left side. The drilling fluid was pumped through the drill pipe and then came into the annulus with the nozzles to remove the initial cuttings that were injected through the cutting inlet (c).

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Experimental and numerical simulation of cuttings transportation in coiled tubing drilling

Cited by 45 publications

References 22 publications

Numerical and experimental investigation on the depressurization capacity of a new type of depressure-dominated jet mill bit

Numerical and experimental investigation on the depressurization capacity of a new type of depressure-dominated jet mill bit

The effect of drill–pipe rotation on improving hole cleaning using polypropylene beads in water-based mud at different hole angles

A Liquid-Solid Two-phase Flow Computational Fluid Dynamic Modelling of the Operational Characteristics Effects on the Cleaning Time of a Circulating Flow Loop

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