ORACLE 8 and BLOB (Word document) : 'BLOB not opened'

Hello,

With Delphi 5, Oracle 8 and Word 97.
Could somebody help solving this messages :

1-EDBEngine Error 'BLOB not opened' when creating a TBlobStream :
myBS := TBlobStream.create(query1BlobTest,bmwrite);

2- EOleSysError 'UnspecifiedError'  when wanting to open Word, for
example when ckicking on a OleContainer.

Thanks a lot for your cooperation,
Denis Dresse