Patent ID: 6138750
Filing Date: 2000-10-31
Classification: B01D,E21B

Abstract:
Means for removing unwanted substances from the stagnant bottom of a well by injecting sufficient water from a reservoir thereof into the well's stagnant bottom to displace the unwanted substances to a position above the pump where they can then be pumped from the well, comprising in combination,a) a water well for pumping water from below the surface of the earth; andb) a water well rehabilitation apparatus for cleaning the stagnant bottom region of the water well of its stagnant water and contaminated contents;c) said water well including a bore extending beyond a natural source of water at an indeterminate depth;d) said water well rehabilitation apparatus including a pump having inlet and outlet ports submerged in the water above the stagnant bottom region of the bore;e) an elongated conduit extending into the bore and connected at its lower end to the outlet port of the pump and its upper end connected to a water reservoir at the surface;f) said water reservoir connected to the aforementioned rehabilitation apparatus, said rehabilitation apparatus including means for injecting into the well pressurized water from a source thereof into the stagnant bottom of the bore below said pump whereby the contents of the well's stagnant bottom below said pump are displaced and elevated to above the pump inlet port whereby activation of the pump purges the well of said displaced and elevated contaminated contents;g) wherein said reservoir is a pressure tank;h) said pump is electrically activated; andi) a pressure switch sensitive to the pressure in said pressure tank activates said pump when the contents of said pressure tank have been injected into the well's stagnant bottom causing the pressure in said pressure tank to fall below a preset lower limit.