Apparatus and methods for pumping solids and undesirable liquids

Details Apparatus and methods for pumping solids and undesirable liquids Apparatus and methods for pumping solids and undesirable liquids

1985-06-26

1986-11-11

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

1661051, 175213, E21B 3700

Patent

active

046216936

ABSTRACT:
An apparatus and methods for removing sand and debris from a well bore utilizes an elongated string which includes a pump functioning to pump debris into the string interior from the lower end of the well bore. The pump includes a stationary hollow piston with a hollow piston rod which is connected to the lower portion of the string, and a cylinder which is connected to the upper portion of the string. The cylinder is keyed to the piston rod to transmit rotary motion from the upper portion of the string via the pump to a lower portion of the string in which the debris is trapped. Check valves are provided below and above the pump in the string to prevent retrograde flow of liquid downwardly in the string. By reciprocating the upper portion of the string, debris is pumped into the lower portion of the string, along with well liquids. The liquid pumped into the string from the well continues upwardly in the string, passing through the interior of the piston rod and piston and into the pump cylinder. The upper portion of the string selectively receives either a ported sub or a continuous unported sub so that, depending upon the sub utilized, the liquid can be recirculated back into the annulus surrounding the string within the well bore, or can be pumped to the surface.

REFERENCES:
patent: 1300346 (1919-04-01), Church
patent: 2099877 (1937-11-01), Westall
patent: 2141672 (1938-12-01), Taylor
patent: 3406757 (1968-10-01), Baumstimler
patent: 3651867 (1972-03-01), Baumstimler
patent: 3697194 (1972-10-01), Holmes
patent: 4190113 (1980-02-01), Harrison
patent: 4421182 (1983-12-01), Moody et al.
patent: 4478285 (1984-10-01), Caldwell

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