Composition comprising a fully dissolved non-HF fluoride source and method for treating a subterranean formation
US7589050B2 · kind B2 · utility
27Cited by
10References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 9, 2007 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Feb 9, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/933
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.