Ideally, you can't get rid of an oily skin but you can reduce the level of oilliness on your face. The skin produce natural sebum(oils) which protect and moisturise the skin. An oily skin can be genetic (skin type) or caused by hormone, and stress. 

Ways to reduce oilliness on the face are;

1. Use pure honey as cleanser on the face in the morning, and leave it on for 15-30minutes before rinsing it off. You can use your regular cleanser/soap at night.
2. Wash your face twice a day using a gentle or pH regulated washes. 
3. Get a salicylic acid toner or witch hazel toner
4. Check your skin care products and avoid comedogenic products,i.e products that can block your pores. 
5. Use stabilize aloe vera gel as your moisturizer in the morning or apply it on your face after bathing, toning, then use your moisturizer or oils suitable for oily skin. Examples of oil suitable for oily skin are jojoba oil, argan oil, neem seed oil, morning seed oil, squalene, etc. 
6. Your makeup also influence oil production. Use Matte or oil free make up. 
7. Mask with clay such as bentonite clay and other clays suitable for oily skin. Clay mask are effective way to reduce oilliness on the face. You can add rosewater to your mask to form a paste, apply on a clean face and leave it on for 15-30 minutes before rinsing off.