You use ourselves to refer to yourself and one or more other people as a group.

A speaker or writer sometimes uses ourselves to refer to people in general. Ourselves is used as the object of a verb or preposition when the subject refers to the same people.

You use ourselves to emphasize a first person plural subject. In more formal English, ourselves is sometimes used instead of 'us' as the object of a verb or preposition, for emphasis.

If you say something such as 'We did it ourselves', you are indicating that something was done by you and a particular group of other people, rather than anyone else.