Challenges of cuttings transport in micro borehole coiled tubing drilling for mineral exploration

Kamyab, Mohammadreza; Rasouli, Vamegh; Cavanough, Gary; Mandal, Sudeep

doi:10.2495/pmr120101

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…A few publications were devoted to summarize the cuttings transport (Pilehvari et al 1999, Azar et al 1997, Kelessidis et al 2002, Nazari et al 2010, Kamyab et. al.…”

Section: Brief History Of Solids Transport Studiesmentioning

confidence: 99%

Overview Solids Transport Study and Application in Oil-Gas Industry-Theoretical Work

Li¹,

Luft²

2014

All Days

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The transport of solids is often encountered in well drilling, completion, well intervention and production processes. The process is affected by many variables and the complexity of the phenomena presents challenges to the field engineer who is trying to determine how these parameters affect solids-transport even if only one of these variables is changed during an operation. In the early stage, solids-transport studies mainly focused on finding the minimum critical velocity to prevent the formation of a stationary debris bed in the wellbore annulus for conventional rotary drilling with mud fluids. Over the past 10 years, the research and development focus has been on obtaining information related to the prediction of the equilibrium solids concentration profile along the whole well path during tripping in, on the wiper trip speed during tripping out, and on the prediction of the hole-cleaning time. Various correlations and models have been developed that would guide the field engineer to design and optimize the hole cleaning process. However, due to the complexity of the process, a comprehensive and proven model still does not exist at present.In this paper, based on 20 years of research experience, the authors present a critical review of the state of the art of previous approaches to studying the solids transport during both drilling and well interventions. It mainly focuses on theoretical studies. An overview of the experimental study of solids transport is given in a companion paper (Li et al. 2014). The methodology used to develop a model to simulate the hole cleaning process is also discussed. To date, completely satisfactory solids transport software, is still not available for the oil industry. Hopefully, this paper will provide a useful and helpful general guide for future research related to this subject and will aid in a better understanding of the lack of previous studies and what issues should be focused on in future research.

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“…A few publications were devoted to summarize the cuttings transport (Pilehvari et al 1999, Azar et al 1997, Kelessidis et al 2002, Nazari et al 2010, Kamyab et. al.…”

Section: Brief History Of Solids Transport Studiesmentioning

confidence: 99%

Overview Solids Transport Study and Application in Oil-Gas Industry-Theoretical Work

Li¹,

Luft²

2014

All Days

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“…Different forms of flow patterns may be observed when two or more phases flow simultaneously [2]. In pipe cross-sections, unpredictable turbulent flow structures generating highly asymmetric volume distribution are a challenge in experiential investigations [4,5]. This kind of unstable flow condition complicates the measurement process and may create difficulties in capturing actual flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Flow Regime, Slug Frequency and Wavelet Analysis of Air/Newtonian and Air/non-Newtonian Two-Phase Flow

et al. 2020

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This study focused on gas/Newtonian and gas/non-Newtonian two-phase horizontal fluid flow behavior by analyzing their flow regime identification and flow structural analysis on a horizontal flow loop apparatus. This involved the recognition of two-phase flow regimes for this flow loop and validation with existing flow maps in the literature. In addition, the study included flow pattern identification via wavelet analysis for gas/Newtonian and gas/non-Newtonian two-phase fluid flow in a horizontal flow loop apparatus. Furthermore, the study was extended to the detailed examination of slug frequency in the presence of air/Newtonian and air/non-Newtonian fluid flow, and the predicted slug frequency model was applied to the studied systems. The obtained results suggest that the flow regime maps and slug frequency analysis have a significant impact. The obtained pressure sensor results indicate that the experimental setup could not provide high-frequency and high-resolution data; nevertheless, wavelet decomposition and wavelet norm entropy were calculated. It offered recognizable flow characteristics for bubble, bubble-elongated bubble, and slug flow patterns. Therefore, this study can provide deep insight into intricate multiphase flow patterns, and the wavelet could potentially be applied for flow analysis in oil and gas pipelines.

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“…However this technology transfer from oil and gas needs modifications to be applicable for mineral exploration. The challenges and recommended solutions for this technology transfer have been addressed in many investigations (Kamyab et al, 2012(Kamyab et al, , 2013a(Kamyab et al, , 2013bRoufail et al, 2013;Mokaramian et al, 2012a;Mokaramian et al, 2012b).…”

Section: Introductionmentioning

confidence: 99%

Rheological properties and slurry behaviour in hard rock drilling

Kamyab

Rasouli

Mandal³

et al. 2013

Mining Technology

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Coiled tubing (CT) drilling offers more efficient drilling operations compared to normal drilling practises resulting in lower operational costs and drilling time in oil and gas operations. This technology is recommended to be used for mineral exploration drilling in hard rock. This requires drilling micro-boreholes at very high speed with small size cuttings. A large volume of such small size cuttings can influence the rheological properties of the drilling fluids significantly. The aim of this study is to understand the effect of small size inert cuttings on the rheological properties of drilling fluids and its consequences on pressure drop changes in the annulus space. Experimental tests were performed on cuttings collected from a mining site, and the results indicated that the fluid rheology is sensitive to the cuttings size. This conclusion suggests that careful measurement of rheological properties of the mud is necessary when it is designed for drilling hard rocks.

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Challenges of cuttings transport in micro borehole coiled tubing drilling for mineral exploration

Cited by 9 publications

References 27 publications

Overview Solids Transport Study and Application in Oil-Gas Industry-Theoretical Work

Overview Solids Transport Study and Application in Oil-Gas Industry-Theoretical Work

Flow Regime, Slug Frequency and Wavelet Analysis of Air/Newtonian and Air/non-Newtonian Two-Phase Flow

Rheological properties and slurry behaviour in hard rock drilling

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