EFFECT OF HOLE SHAPE ON ROUGHNESS FRICTION FACTOR IN PERFORAT-ED AND SLOTTED HORIZONTAL BOREHOLES USED FOR OPENCAST MINE DEWATERING

Duc Huan Tran; Carsten Drebenstedt

doi:10.17073/2500-0632-2018-2-9-12

EFFECT OF HOLE SHAPE ON ROUGHNESS FRICTION FACTOR IN PERFORAT-ED AND SLOTTED HORIZONTAL BOREHOLES USED FOR OPENCAST MINE DEWATERING

Duc Huan Tran, Carsten Drebenstedt

https://doi.org/10.17073/2500-0632-2018-2-9-12

Full Text:

Abstract

Horizontal boreholes were adapted for using in mine dewatering systems. Efficient and economically sound application of this new method of dewatering requires using perforated or slotted pipes as filters when installing casing. Pressure drop along a horizontal borehole is a major factor that affects the borehole performance. The pressure drop is caused by four separate effects: wall friction, perforation roughness, inflow acceleration, and mixing effects. This paper is devoted to studying the effects of these two former factors in perforated or slotted pipes. Numerical analysis was carried out using different types of perforation holes and slots. The simulation model was constructed using ANSYS Fluent 14.5 software. The results showed that at high Reynolds number, roughness friction factor values in perforated pipes with circular holes are significantly higher than those in slotted pipes with axially elongated slots and slotted pipes with perpendicular (to pipe axis) slots.

Keywords

perforation roughness, horizontal filters, dewatering, opencast mines.,

About the Authors

Duc Huan Tran

Freiberg University of Mining and Technology Hanoi University of Mining and Geology
Germany

6, Akademischestrafte, Freiberg, Germany, D-09596

18, Pho Vien Street, Duc Thang Ward, Bac Tu Liem District, Hanoi, Vietnam

Carsten Drebenstedt

Freiberg University of Mining and Technology
Germany
6, Akademischestrafte, Freiberg, Germany, D-09596

References

1. Eichler R.A., Drebenstedt C. Innovative Dewatering Concepts for Open Cast Mines Using Horizontal Wells (HDD-Wells), Mine Planning and Equipment Selection, 2014, pp. 697-706.

2. Mansel H., Drebenstedt C., Jolas P., Blankenburg R. Dewatering of Open-cast Mines using Horizontal Wells, International Mine Water Association, 2012.

3. Tran D.H., Drebenstedt C. Challenges during Horizontal Directional Drill-ing (HDD) Wells Installation for Dewatering Opencast Mines, Scientific Re-ports on Resource Issues, Freiberg, Germany, 2014.

4. Tran D.H., Drebenstedt C. Considerable Aspects to Select Filter Wells for Dewatering, Scientific Reports on Resource Issues, Freiberg, Germany, 2015.

5. Jiang W., Sarica C., Ozkan E., Kelkar M. Investigation of the Effects of Completion Geometry on Single-Phase Liquid Flow Behavior in Horizontal Wells, Journal of Energy Resources Technology, Bd. Vol. 123, 2001, pp. 119-126,.

6. Su Z., Gudmundsson J.S. Perforation Inflow reduces Frictional Pressure Loss in Horizontal Wellbores, Journal of Petroleum Science and Engineering, Bd. 19, 1998, pp. 223-232,

7. Su Ze, Gudmundsson J.S. Friction Factor of Perforation Roughness in Pipes, Society of Petroleum Engineers, 1993.

8. Su Ze, Gudmundsson J.S. Pressure Drop in Perforated Pipes: Experiments and Analysis, Society of Petroleum Engineer, Melbourne, Australia, 1994.

9. Abdulwahid M.A., Dakhil S.F., Injeti N.K. Numerical Investigation of the Turbulent Flow Parameters Distribution in a Partly Perforated Horizontal Wellbore, European Scientific Journal, Bd. Vol. 9, 2013, pp. 372-387.

10.

Supplementary files

For citation: Tran D., Drebenstedt C. EFFECT OF HOLE SHAPE ON ROUGHNESS FRICTION FACTOR IN PERFORAT-ED AND SLOTTED HORIZONTAL BOREHOLES USED FOR OPENCAST MINE DEWATERING. Gornye nauki i tekhnologii = Mining Science and Technology (Russia). 2018;(2):9-13. https://doi.org/10.17073/2500-0632-2018-2-9-12

Refbacks

There are currently no refbacks.

This work is licensed under a Creative Commons Attribution 4.0 License.

ISSN 2500-0632 (Online)

Username
Password