Cut sausage links into rounds. Heat oil in pot over medium heat. Add sausage to the pot to brown for 5-7 minutes tossing frequently
Remove sausage from pot and add onion, celery and carrot - add more oil if needed. Saute veggies for about 5 minutes over medium heat. Add salt, oregano and basil and saute for another minute.
Mix the tomato paste in with the veggies. Then, mix in the chicken broth, water, potatoes and browned sausage. Bring the soup to a boil.
Reduce heat to a simmer, cover and simmer for about 30 minutes - potatoes should be tender.
Take ½ cup of broth out of the pot and slowly mix with the heavy cream - this prevents curdling. Pour this mixture back into the pot and stir. Taste and season with salt and pepper as needed.