Aug 29 (Reuters) - Encana Corp ECA.TO :
* ENCANA ANNOUNCES PRELIMINARY RESULTS OF SUBSTANTIAL ISSUER BID
* ENCANA CORP - OFFER WAS OVERSUBSCRIBED
* ENCANA - SHAREHOLDERS WHO MADE AUCTION TENDERS AT A PRICE IN EXCESS OF $4.50 PER SHARE SHOULD NOT EXPECT TO HAVE ANY OF SHARES PURCHASED BY ENCANA