Apparatus and methods for cleaning well perforations

Details Apparatus and methods for cleaning well perforations Apparatus and methods for cleaning well perforations

1987-08-19

1988-12-27

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

166331, E21B 2100

Patent

active

047934174

ABSTRACT:
A system for cleaning perforations in a well bore by surging formation fluid through the perforations. A wireline retrievable well tool is installed in the well bore above the perforations to establish a fluid barrier which will divide the well bore into a first fluid pressure zone and a second fluid pressure zone. The well tool includes a flow path closure device which will suddenly open when the difference in pressure between the first zone and the second zone exceeds a preselected value. The sudden opening of the closure device results in a surge of fluid flow from the downhole formation which cleans the perforations.

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Coil Tubing, Nitrogen Cut Workover Costs, World Oil Feb. 1, 1970.

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