Abstract
The horizontal wells have been adapted to use for dewatering purpose in the mining industry. Due to unique characteristics, those horizontal filters are rec-ommended to utilize not only the mechanical strength but also the hydraulic per-formance. Pressure drop along the horizontal well is a major factor that affects the performance of a wellbore. The pressure drop incurs due to four separate effects: wall friction, perforation roughness, inflow acceleration and mixing ef-fects. This work presents the effects of the two first factors in perforated or slot-ted pipes, which correspond to the case of no flow through the wall. Numerical analysis was carried out with different types of perforations and slots. The simu-lated model accomplished using ANSYS Fluent 14.5. The results revealed that at high Reynolds number, the roughness friction factors in circular perforated pipes are significantly greater than those in axial slotted pipes and perpendicular slotted pipes.
Highlights
The horizontal directional drilling (HDD) technology has been experimented in the mining industry to dewater opencast mines [1, 2]
This paper addresses the first phase of the study on the pressure drop along the horizontal filters without inflow through the wall: the effect of perforation roughness
Simulated data showed that flows in pipes with different cavity shapes produced different pressure drops
Summary
The horizontal directional drilling (HDD) technology has been experimented in the mining industry to dewater opencast mines [1, 2]. Economically apply this new method of dewatering, it is recommended to use perforated or slotted pipes as filters during its installation [3, 4]. This paper addresses the first phase of the study on the pressure drop along the horizontal filters without inflow through the wall: the effect of perforation roughness. The effect of perforation roughness and inflow through the wall were studied quite thoroughly in the literature [5 8] These studies mostly varied the size, the phasing, and the density of circular perforations. This presented work focuses on the shapes of cavities in different filter pipes using the numerical analysis. The pipes were uniformly perforated or slotted with different sizes, different shapes (i.e. CPC, ASC, and PSC), and different ratios.
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