Spokesman Brent Anderson says the evacuation order on Wednesday has affected relatively few workers.
He says the fire is burning about 12 kilometres from the facilities, south of Dawson Creek.
Meanwhile, Shell Canada says it has also shut in a few wells as a precaution, but that the impact is not material.
Encana, Husky Energy, ConcoPhillips, Progress Energy and Apache all say their operations are unaffected.
The B.C. Oil and Gas Commission says 200 employees have been ordered out of work camps operated by Horizon Logistics.
Information Officer, Jill Kelsh says the 5,000 hectare blaze was only a rough estimate, and a more accurate reading has now recorded 4,500 hectares.