Dear Ismael Letang ...

Dear Ismael Letang

Analytical Technique for the estimation of mines water inflow

 

Reliable estimation of groundwater inflow into underground openings is critical to design and construction of underground crude oil storage in rock masses. Water detection is crucial in helping decide whether water curtain holes should be added to achieve water balance, especially during excavation. The transient electromagnetic method (TEM) is an electromagnetic induction technique measuring the duration of the magnetic field of a pulse current in a transmitter loop. TEM can measure the electrical resistivity of underground layers to a depth of several hundred meters. Originally designed for mineral investigations, over the past TEM has been very effective in hydro geophysical work.

Despite the vicinity of water bearing zones, fractured rock's variable hydraulic continuity often requires use close to the storage caverns of a water-curtain system. The groundwater pressure around the storage caverns should be higher than the pressure of stored oil to prevent oil leakage into the rock mass. Water curtains artificially recharge water in the rock mass to enhance flow patterns and maintain a high hydraulic potential near the storage cavern (attached fig). Equations 1 and 2(attached) calculate this flow .

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Regards,

Prem Baboo