In a large saucepan, heat the oil over medium heat; sauté the carrots, celery, onion and sausage until the onions are translucent. Add the beer, chicken stock, paprika, thyme and Worcestershire sauce. Stir occasionally and bring to a boil. Turn the burner to low and add the cream.
PREPARE THE ROUX:
In a small saucepan, melt the butter. Whisk in about 2 tablespoons of flour to make a thick paste. Stir constantly over medium-heat until the mixture turns light brown and has a nut-like aroma.
Add the roux to the saucepan one teaspoon at a time stirring continuously, until the soup has the consistency of a chowder. Finally, add the cheese a little at a time, stirring until it is dissolved.