Canadian Superior Energy Inc. Announces Natural Gas Discoveries at Drumheller and Windfall- Completes Successful 2005 Winter Drilling and Well Completion Program.

CALGARY, Alberta -- Canadian Superior Energy Inc. ("Canadian Superior") (TSX:SNG) (AMEX:SNG) of Calgary, Alberta, Canada announced today the successful completion of its 2005 Western Canada winter drilling and well completion program. During the first three months of 2005, Canadian Superior drilled 4 gross wells (3.15 net) and completed 11 gross wells (5.5 net) which resulted in 10 gas wells (4.5 net), one standing cased gas well (0.75 net) and one D&A well (1.0 net). This success compares favorably to Canadian superiors 2004 drilling & completion success rate of over 90%.

Of particular interest during the 2005 winter drilling and completion program were natural gas discoveries at Drumheller and Windfall. At Drumheller, the Company has recently completed the drilling and testing of a 100% W.I. gas well that A.O.F. tested 10 mmcf per day which is expected to be initially placed on-stream at 2.3 mmcf per day with 40 bbls per day of additional condensate production. Drumheller is located in Central Alberta where Canadian Superior has major holdings with year round access. Also at Drumheller, seven coal bed methane (CBM) wells (W.I. 30%) were successfully completed with a combined test rate of 1.2 mmcf per day.

In West Central Alberta, Canadian Superior also announced today two natural gas discoveries in the Windfall area. One gas well (100% W.I.) was successfully drilled, completed and tested at 1.5 mmcf per day and a second non-operated gas well (40% W.I.) was drilled, completed and tested at 750 mcf per day. All of the above wells are currently in the process of being tied in, and it is anticipated the wells will be on production, after breakup, in mid May, and add to Canadian Superior's growing Western Canadian production base.

In addition, at East Ladyfern, Canadian Superior completed the drilling of its Slave Point operated exploration test well (75% W.I.) located at L.S.D. 01-26-91-11 W6M. The well was drilled to depth and cased, but due to unseasonably warm weather in this winter access only area, the Company was unable to complete and evaluate this well prior to spring breakup and the prospect will be further evaluated during the next drilling season.

For further information and maps on Canadian Superior's Western Canada, Offshore Trinidad and Offshore Nova Scotia operations and holdings, see Canadian Superior's website at www.cansup.com.

This press release contains forward-looking information on future production, project start-ups and future capital spending. Actual results or estimated results could differ materially due to changes in project schedules, operating performance, demand for oil and gas, commercial negotiations or other technical and economic factors or revisions. Statements contained in this press release relating to future results, events and expectations are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievement of the Company, or industry results, to be materially different from any future results, performance or achievements expressed or implied by such statements. Such factors include, among others, those described in the Company's annual report on Form 40-F on file with the U.S. Securities and Exchange Commission.

Canadian Superior Energy Inc. (TSX:SNG) (AMEX:SNG)