Title:
COMPOSITION AND METHOD FOR TREATING A SUBTERRANEAN FORMATION
Document Type and Number:
WIPO Patent Application WO2004094557
Kind Code:
B1
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.
Inventors:
FRENIER WAYNE (US)
ZIAUDDIN MURTAZA (US)
DAVIES STEPHEN (US)
CHANG FRANK (US)
ZIAUDDIN MURTAZA (US)
DAVIES STEPHEN (US)
CHANG FRANK (US)
Application Number:
PCT/IB2004/001192
Publication Date:
December 09, 2004
Filing Date:
April 20, 2004
Export Citation:
Assignee:
SCHLUMBERGER CA LTD (CA)
SCHLUMBERGER SERVICES PETROL (FR)
SCHLUMBERGER HOLDINGS
SCHLUMBERGER TECHNOLOGY BV (NL)
SOFITECH NV (BE)
FRENIER WAYNE (US)
ZIAUDDIN MURTAZA (US)
DAVIES STEPHEN (US)
CHANG FRANK (US)
SCHLUMBERGER SERVICES PETROL (FR)
SCHLUMBERGER HOLDINGS
SCHLUMBERGER TECHNOLOGY BV (NL)
SOFITECH NV (BE)
FRENIER WAYNE (US)
ZIAUDDIN MURTAZA (US)
DAVIES STEPHEN (US)
CHANG FRANK (US)
International Classes:
E21B43/00; E21B43/22; E21B43/25; E21B43/26; E21B43/267; E21B43/27; (IPC1-7): C09K7/02; E21B43/27
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