As per your concern I will let you know address of Hindustan Petroleum Corporation Limited, Lucknow office so that you can remember route.

Here is the address

Hindustan Petroleum Corporation Limited
Plot No. 1, Nehru Enclave, Gomti Nagar, Lucknow, Uttar Pradesh 226010

Phone:-
0522 230 8123 ext. 2308868

Here is the procedure to search for offices

Go to official site of Hindustan Petroleum Corporation Limited
There at bottom middle page
Click the section of contact
A new page will open which looks like this
There you can search offices of HPCL easily .

Address:-
Hindustan Petroleum Corporation Limited
Petroleum House, 17,
Jamshedji Tata Road,
Mumbai 400020