ROBERT JAMES KADWELL
Engineers in Minneapolis, MN

5028212, Jul 2, 1991

Sep 26, 1989

7/412939

Robert W. Brophey - Minneapolis MN
Robert J. Kadwell - Minneapolis MN

F04B 4900

417 12

The present invention provides a method and apparatus for removing floating, substantially immiscible liquids such as hydrocarbons from containers or wells containing both floating liquids and water. In one aspect of the invention, a microprocessor control receives and processes input signals from a liquid sensor, an upper water interface sensor and a skim pump. The skim pump is located in the well proximate to the water interface. The liquid sensor is located proximate to the skim pump. The upper water interface sensor is located adjacent to and below the liquid sensor. The microprocessor control is initialized by setting certain parameters such as the initial conditions for pump output values. The microprocessor controls and operates the skim pump in response to the input signals so as to operate the skim pump in a manner responsive to the input signals.

5147559, Sep 15, 1992

May 1, 1991

7/694411

Robert W. Brophey - Minneapolis MN
Robert J. Kadwell - Minneapolis MN

E21B 3406, E21B 4312, B01D 1712

210744

A method for removing floating immiscible liquids from a well containing both the floating immiscible liquids and water, where the floating immiscible liquids and water meet at a water interface, by controlling a cone of depression within the well. A removal system for removing said floating immiscible liquids is used including a microprocessor, a discharge water line and an upper water interface sensor where at least a portion of the discharge water line is located within the well. The upper water interface sensor is located within the well at a sensor location. The method includes the steps of inserting a modulating control valve into the discharge water line, the modulating control valve being connected to be controlled by the microprocessor, opening the modulating control valve when the water interface rises up to the sensor location, closing the modulating control valve when the water interface falls below the sensor location, and operating the microprocessor to open and close the modulating control valve at a rate which keeps the water interface at a substantially static level.

5322119, Jun 21, 1994

Sep 14, 1992

7/944451

Robert J. Kadwell - Minneapolis MN
Michael A. Yusella - Phillipsburg NJ
Robert J. Clark - Buttzille NJ

E21B 33068, F04B 4906

166 67

A submersible well probe sleeve made of a cylindrical tube attached to a submersible pump. The cylindrical tube has a number of slots exposing access to a protective pouch. Inside the protective pouch a fluid level sensing probe is placed. The fluid has access to the pouch through slots in the sleeve. Opposite the pouch at a predetermined level is a number of fluid inlet holes which provide access to the center of the cylinder by fluid in the well. The submersible pump draws fluid into the center of the cylinder past the probe. The submersible well probe sleeve provides a fixed relative position between the probe and the inlets such that the level of the well can be maintained at a precise level and the probe can be installed in the well while under the protection of the sleeve.