Wait for a Week after that You will be again able to Send Friends
Request. To Decrease Spam Orkut account Blocked to take more action
regarding Friends adding, posting in Communities, Posting Scraps, If we
Send More within a Short Period. I suggest you to Send request untill
the Captcha, if you are Getting Captcha then You should Stop sending
Request at that moment. For More Detailed Information about this Please
Check the help Reference attached.