Review of Cuttings Transport in Directional Well Drilling: Systematic Approach

Nazari, Tahmineh; Hareland, Geir; Azar, J.J.

doi:10.2118/132372-ms

Cited by 72 publications

(27 citation statements)

References 64 publications

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“…Previous studies indicate that cuttings transport is influenced by many factors, such as cuttings characteristics, drilling fluid type and rheology, operational parameters including drill pipe rotation, pump rate, weight on bit, ROP, eccentricity and diameter of hole and drill pipe, and wellbore inclination (Okrajni and Azar, 1986;Sifferman and Becker, 1992;Zeidler, 1972). A comprehensive review of cuttings transport studies was reported by Kelin et al (2013) and Nazari et al (2010).…”

Section: Introductionmentioning

confidence: 99%

Hole-cleaning performance comparison of oil-based and water-based drilling fluids

Sayindla

Lund

Ytrehus

et al. 2017

Journal of Petroleum Science and Engineering

101

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Cuttings transport is a topic of great interest in the oil and gas drilling industry. Insufficient cuttings transport leads to several expensive problems. Knowledge and selection of the drilling fluids is one of the important factor for efficient hole cleaning. It has been observed, however, that the hole cleaning performance of drilling fluids can be different even if the fluid rheological properties are similar as measured in accordance with API specifications. The reasons for stated difference in the behavior of drilling fluids are not well understood. The main objective of present work is to evaluate hole cleaning efficiency of an oil-based drilling fluid (OBM) and a water-based drilling fluid (WBM) whose viscosity profiles are similar as per API specifications.Hole cleaning efficiency of an oil-based drilling fluid and a water-based drilling fluid whose rheological properties are similar was investigated. The fluids tested were industrial fluids used in the field and were sent to us after reconditioning. Experimental studies were performed on an advanced purpose-built flow-loop by varying flow velocities and drill string rotation rates. The flow loop had a 10 m long annulus section with 4" inner diameter wellbore and 2" outer diameter fully eccentric drill string. Pressure drop and sand holdup measurements were reported. Rheological investigations of the same fluids were used to understand the difference in the behavior of the drilling fluids tested. Higher pressure drop was observed for WBM compared to OBM, and for both fluids, the pressure drop increased with drill string rotation speed. In case of no drill string rotation, better hole cleaning performance was observed with the oil-based fluid compared to the water-based fluid. With the presence of drill string rotation, hole cleaning performance of both the fluids was nearly the same.

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Section: Introductionmentioning

confidence: 99%

Hole-cleaning performance comparison of oil-based and water-based drilling fluids

Sayindla

Lund

Ytrehus

et al. 2017

Journal of Petroleum Science and Engineering

101

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“…Mud type has small to moderate positive effect on cuttings removal away from PDC bit [18]. Different mud types lead to different bed consolidation.…”

Section: Mud Rheologymentioning

confidence: 97%

PDC Bit Hydraulic & Mud Rheological simulation to model pressure drop across Bit

2017

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Abstract. During fluid flow from larger to smaller diameter pipes, a drop in pressure is experienced. High pressure drop across bit indicated high energy loss in the hydraulic system and also a setback to ROP performance. This is inefficient and pressure pumps would have to be of bigger sizing to make up for the losses. Present form of pressure drop models is in terms of mud density, flow rate, and total flow area. The objective of this paper is focused on the analysis of CFD simulation and to propose optimized parameters for improved ROP. Single phase flow study of Yield Power Law mud rheology was simulated at bottom hole of horizontal section. Parametric study on mud rheology was carried using DOE. Design points of DOE were sampled mostly using Latin Hypercube Sampling and a few by Central Composite Design. It is found that Kriging Response Surface method generated the best regression model where the predicted values are closest to the observed values and has the lowest Maximum Relative Residual (0.000336%). Inlet velocity and Power Index have significant effect on pressure drop. Consistency Index showed moderate effect while Yield Stress showed small effect to pressure drop. This research has proven that pressure loss model should take into account of mud rheology. Further research can be done with PDC bit rotation and its effect on mud behaviour.

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“…Nazari [10] found that there are several drilling variables that affect cutting transport in directional wells. These variables are the following: …”

Section: Basics Of Cutting Transportmentioning

confidence: 99%

A Comprehensive Comparison Study of Empirical Cutting Transport Models in Inclined and Horizontal Wells

Shiddiq¹,

Christiantoro²,

Syafri³

et al. 2017

J. Eng. Technol. Sci.

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Abstract. In deviated and horizontal drilling, hole-cleaning issues are a common and complex problem. This study explored the effect of various parameters in drilling operations and how they affect the flow rate required for effective cutting transport. Three models, developed following an empirical approach, were employed: Rudi-Shindu's model, Hopkins', and Tobenna's model. RudiShindu's model needs iteration in the calculation. Firstly, the three models were compared using a sensitivity analysis of drilling parameters affecting cutting transport. The result shows that the models have similar trends but different values for minimum flow velocity. Analysis was conducted to examine the feasibility of using Rudi-Shindu's, Hopkins', and Tobenna's models. The result showed that Hopkins' model is limited by cutting size and revolution per minute (RPM). The minimum flow rate from Tobenna's model is affected only by well inclination, drilling fluid weight and drilling fluid rheological property. Meanwhile, Rudi-Shindu's model is limited by inclinations above 45°. The study showed that the investigated models are not suitable for horizontal wells because they do not include the effect of lateral section.

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Review of Cuttings Transport in Directional Well Drilling: Systematic Approach

Cited by 72 publications

References 64 publications

Hole-cleaning performance comparison of oil-based and water-based drilling fluids

Hole-cleaning performance comparison of oil-based and water-based drilling fluids

PDC Bit Hydraulic & Mud Rheological simulation to model pressure drop across Bit

A Comprehensive Comparison Study of Empirical Cutting Transport Models in Inclined and Horizontal Wells

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