Foil wrapped base pipe for sand control

Details Foil wrapped base pipe for sand control Foil wrapped base pipe for sand control

1992-09-28

1994-05-10

Britts, Ramon S.

Wells

Processes

Preventing flow into strainer while lowering by blocking...

166 56, 166157, 166205, 166228, 166300, 166376, E21B 4310

Patent

active

053100000

ABSTRACT:
The flow apertures of a perforated mandrel are temporarily sealed by a foil covering sheet which is made of a sacrificial material, for example, zinc, aluminum and magnesium The sacrificial covering sheet prevents dirty completion fluid from passing through and in and out of the screen as it is run into the hole, thereby protecting the screen from plugging. During the time the screen mandrel is temporarily sealed by the sacrificial foil covering, cleaning fluid is circulated through the work string and is returned through the annulus between the screen and the open well bore for removing filter cake, drilling debris and lost circulation material. After the annulus has been cleaned, the annulus is filled with an acid solution or caustic solution, which dissolves the sacrificial foil and opens the base pipe perforations.

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