Acid-coated sand for gravel pack and filter cake clean-up

Details Acid-coated sand for gravel pack and filter cake clean-up Acid-coated sand for gravel pack and filter cake clean-up

2006-11-07

2006-11-07

Tucker, Philip C. (Department: 1712)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S269000, C507S901000, C507S924000, C166S280200

Reexamination Certificate

active

07132389

ABSTRACT:
A method of the preparation and utilization of polymerized alpha-hydroxycarboxylic-acid-coated proppants for gravel pack and removal of filter cake that was deposited by reservoir drilling fluid. In a preferred example, polyglycolic-acid-coated sand is used to replace conventional gravel pack sand typically used for gravel packing. Under downhole conditions, the acidic by-product generated from the hydration of polyglycolic-acid-coated sand can break down acid-soluble and/or acid-breakable components embedded in the filter cake. This reaction enhances the filter cake removal and the flow of hydrocarbon from the producing formation. The polyglycolic-acid-coated sand may be produced by polymerizing a glycolic acid with a natural or synthetic proppant like 20–40 mesh commercial sand, at temperatures of about 210° F. or higher.

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