Method for cleaning a helical spring sand screen
AssigneeTexaco Inc.
InventorReynaldo Calderon
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Abstract
Methods for cleaning sand from a helical spring sand screen for use at the petroliferous unconsolidated sand strata of an oil well are the basic steps: (1) ceasing flow from the production tube, (2) injecting high pressure liquid into a reciprocal valve means for expanding the helical spring sand screen, and (3) injecting more high pressure liquid into the helical spring sand screen for cleaning thereof. Then upon ceasing of flow of the high pressure liquid, the stored energy in another spring contracts the helical spring sand screen for restoring production of sand-free oil from the production tube. A second modification is disclosed.
Claims8
A method for cleaning a helical spring sand screen which has a reciprocal valve means connected to the helical spring sand screen for contracting the helical spring for filtering sand from liquid from a producing well for producing sand-free liquid through a production tube and for expanding the helical spring sand screen for backwashing liquid therethrough for cleaning thereof comprising,
- (a) ceasing flow from the production tube,
- (b) injecting high pressure liquid into the recipocal valve means for expanding the helical spring sand screen, and
- (c) injecting more high pressure liquid into the helical spring sand screen for cleaning thereof.
Dependencies are inferred from the claim text.