Process for increasing near-wellbore permeability of porous formations

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Claims

3. A method as defined in claim 1, wherein the heat treatment lasts more than 4 hours after the desired temperature is reached.

5. A method as defined in claim 1, wherein inert gas is injected at a pressure higher than the reservoir pressure.

6. A method as defined in claim 1, wherein the downhole heater is an electrical resistance heater, a gas heater, or a high frequency dipole heating device.

Referenced Cited
U.S. Patent Documents
2685930 August 1954 Albaugh
2782859 February 1957 Garst
3603396 September 1971 Braun
3847222 November 1974 Braden, Jr.
4164979 August 21, 1979 Nooner
4227575 October 14, 1980 Nooner
4454917 June 19, 1984 Poston
4574886 March 11, 1986 Hopkins et al.
4615392 October 7, 1986 Harrigal
4703800 November 3, 1987 Hanna
4844169 July 4, 1989 Sloat
4875809 October 24, 1989 Csajtai et al.
5052490 October 1, 1991 Reed
5255740 October 26, 1993 Talley
Foreign Patent Documents
915573 November 1972 CAX
1282685 April 1991 CAX
Patent History
Patent number: RE35891
Type: Grant
Filed: Oct 3, 1995
Date of Patent: Sep 8, 1998
Assignee: Noranda Inc. (Quebec)
Inventors: Abul K. M. Jamaluddin (Calgary), Taras W. Nazarko (Calgary)
Primary Examiner: William P. Neuder
Law Firm: Keck, Mahin & Cate
Application Number: 8/538,664
Classifications
Current U.S. Class: Heating, Cooling Or Insulating (166/302); 166/272
International Classification: E21B 4324;