Remedial system to flush contaminants from tubing string

Details Remedial system to flush contaminants from tubing string Remedial system to flush contaminants from tubing string

2006-07-04

2006-07-04

Bagnell, David (Department: 3672)

Wells

Processes

Cleaning or unloading well

C166S090100, C166S242200

Reexamination Certificate

active

07069995

ABSTRACT:
A method of cleaning debris from a string of production tubing in a well enables removal without pulling the string of rods that extend through the tubing. A rotary pump is suspended to a lower end of the tubing for pumping well fluid through the tubing to a wellhead at the surface. A motor assembly at the surface rotates the rods to drive the pump. A closure member is placed on a lower end of an elastomeric hose that will open when a selected level of internal fluid pressure is applied. The operator applies internal pressure to the hose at a pressure less than the selected level to increase rigidity of the hose. The operator inserts the hose through a port in a sidewall of the wellhead, the hose deflecting downward and into the tubing. At a desired point, the operator increases the internal pressure in the hose to open the closure member, then discharges a cleansing fluid into the tubing, which flows back up the tubing along with debris.

REFERENCES:
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patent: 6289992 (2001-09-01), Monjure et al.
patent: 6352113 (2002-03-01), Neuroth

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