Opening at the level of 2 indicates to your partner that you have a very long suit with 10 or fewer HCP so your hand is strong distributionally but weak in points. This is a pre-emptive bid and but only 6 - 10 HCP.
The 2♦, 2♠, 2♥ openings are weak pre-emptive bids showing at least 6 cards and fewer than 13 TP. You promise at least 2 honors in your suit..
Unless partner makes a forcing bid, you should not bid again.
Bridge Lessons Online - Opening Weak 2 Bids - Acol Lesson 20