Stimulation of thick Mississippian carbonate sections in foothill wells
Restimulation of gas wells in the Quirk Creek field in SW. Alberta has proven an economical method of increasing deliverability. Drilling and completion costs of the first 4 wells were $1.75 million for total AOF of 47.1 MMcfd, or $37,000 per MMcf. Restimulation treatments more than doubled AOF to 96.8 MMcfd for only $7,000 per additional MMcf. The gas is moderately rich in condensate and H/sub 2/S. Net pay varies from 125 to 175 ft and is scattered in isolated stringers of 2 to 50 ft thickness with 8% average porosity. Large volume acid fracture treatments were used to open up the formation in each well and bring into production the unproductive potential stringers which were not contributing. The use of ball sealers helped to distribute acid to each zone. From the knowledge gained, new foothills wells are now being completed according to new quidelines: packers are used to divide the reservoir into 250-ft intervals, the maximum height of a vertical fracture system; each porous stringer is perforated with a minimum number of shots; perforations and adjacent formation are cleaned up with a 5,000-gal HCl acid treatment using ball sealers.
- Research Organization:
- Imperial Oil Ltd.
- OSTI ID:
- 6884204
- Report Number(s):
- CONF-700586-
- Journal Information:
- Pap. Annu. Petrol. Soc. of CIM Mtg.; (United States), Vol. 21; Conference: 21. annual petroleum society technical meeting, Calgary, Alberta, Canada, 6 May 1970
- Country of Publication:
- United States
- Language:
- English
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