Method and apparatus for cleaning wells

Wells – Processes – Cleaning or unloading well

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Details

1663051, E21B 3700

Patent

active

061422320

ABSTRACT:
A method and apparatus for cleaning the producing areas of water wells including screens and the surrounding formations. Chemicals that may be used for cleaning the well are applied through a surge tube and forced from the tube by gas such as carbon dioxide. At the same time, gas is injected into the well through an injection line which terminates below the surge tube. The opposing forces from the chemical application and gas injection drive the chemicals through the screen, gravel pack, and into the formation to dislodge and dissolve materials that tend to plug the well. When the chemical application and gas injection are stopped, the pressure in the well is reduced to draw the dislodged materials into the well. They are removed by a submersible pump or gas lift.

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