Composition and method for treating a subterranean formation

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component

Reexamination Certificate

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Details

C507S260000, C507S273000, C507S277000, C507S933000, C166S300000, C166S307000

Reexamination Certificate

active

10249573

ABSTRACT:
An aqueous oilfield treatment fluid containing a chelating agent and an HF source is described. This fluid is effective at dissolving siliceous materials such as clays and keeping the dissolved materials in solution. In particular it is effective at preventing re-precipitation of initially-dissolved silicon as silica and therefore reduces damage to sandstones with which it is contacted. Methods are given for using this fluid for sandstone matrix stimulation, removal of clay-containing drilling fluid components and filter cakes from wellbores, sandstone acid fracturing, and gravel pack and proppant pack cleaning.

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10/248,540—Propped Fracture with High Effective Surface Areaby Chan et al.
SPE 13563—A Buffer-Regulated HF Acid for Sandstone Acidizing to 550° Fby R.F. Scheuerman.
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SPE 63242—Use of Highly Acid-Soluble Chelating Agents in Well Stimulation Servicesby Wayne W. Frenier and David Wilson.

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