Apparatus and process for drawing water from a water-bearing strata

Claim 1

A process for drawing water free from sand from a well bored into a water-bearing strata and preventing water from being drawn into a pump at high speed, the steps of flowing the water into the well from a water-bearing strata through a plurality of openings distributed over a surface of a predetermined length of a wall of the well, the water flowing into the well under natural flow characteristics and below the inertia force of any sand in the strata, flowing the water within the well through a permeable body into a restricted space in the interior of the well, controlling the rate of flow of water through the permeable body such that the quantity of water flowing into the restricted space corresponds to the natural flow of water from the strata and to the pumping capacity of a pump connected to the permeable body such that the quantity of water to be pumped will flow into the restricted space without any force by the pump, and distributing the pump action of the water from the restricted space over the entire length of the permeable body and over the predetermined length of the perforated wall of the well.

Claim 3

An apparatus for drawing water free of sand from a well bored into a water-bearing strata comprising a tubular filter element perforated over a predetermined length thereof to define a well wall, a cylindrical suction control element having a permeable wall through which water flows and disposed concentrically within said well wall and extending through the predetermined length of the well wall, the upper portion of said permeable suction control element being at the same depth as the upper perforations in said well wall, the lower end of said cylindrical suction control element being closed and the upper end thereof being open, a pump having an inlet tightly connected to the upper end of said suction control element, said suction control element having a surface area, length and permeability such that the rate of flow of water through the permeable wall corresponds to the natural flow characteristics of water in the strata and below the inertia force of any sand in the strata, the pump having a capacity corresponding to the quantity of water flowing into the suction control element per unit time, the water flowing from the strata into the well without any suction force by the pump.

Claim 4

An apparatus for drawing water free of sand from a well bored into a water-bearing strata comprising a tubular filter element perforated over a predetermined length thereof to define a well wall, a cylindrical suction control element having a permeable wall through which water flows and disposed concentrically within said well wall and extending through the predetermined length of the well wall, the upper portion of said permeable suction control element being at the same depth as the upper perforations in said well wall, the lower end of said cylindrical suction control element being closed and the upper end thereof being open, a pump having an inlet tightly connected to the upper end of said suction control element, said suction control element having a surface area, length and permeability such that the rate of flow of water through the permeable wall corresponds to the natural flow characteristics of water in the strata and below the inertia force of any sand in the strata, the pump having a capacity corresponding to the quantity of water flowing into the suction control element per unit time, the water flowing from the strata into the well without any suction force by the pump.