Methods for increasing production from a wellbore
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United States of America Patent
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Nov 2, 2004
Grant Date -
Oct 23, 2003
app pub date -
Apr 22, 2002
filing date -
Apr 22, 2002
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Abstract
The present invention generally relates to a method for recovering productivity of an existing well. First, an assembly is inserted into a wellbore, the assembly includes a tubular member for transporting drilling fluid downhole and an under-reamer disposed at the end of the tubular member. Upon insertion of the assembly, an annulus is created between the assembly and the wellbore. Next, the assembly is positioned near a zone of interest and drilling fluid is pumped down the tubular member. The drilling fluid is used to create an underbalanced condition where a hydrostatic pressure in the annulus is below a zone of interest pressure. The under-reamer is activated to enlarge the wellbore diameter and remove a layer of skin for a predetermined length. During the under-reaming operation, the hydrostatic pressure is maintained below the zone of interest pressure, thereby allowing wellbore fluid to migrate up the annulus and out of the wellbore. After the under-reaming operation, back-reaming may be performed to remove any excess wellbore material, drill cuttings and fines left over from the under-reaming operation and to ensure no additional skin damage is formed in wellbore. Upon completion, the under-reamer is deactivated and the assembly is removed from the wellbore.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- WEATHERFORD TECHNOLOGY HOLDINGS, LLC
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Pia, Giancarlo T | Aberdeen, GB | 3 | 133 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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