A snowstorm has hit parts of the Permian Basin in West Texas and New Mexico, affecting some crude output.
The weather has also left some roads dangerous for trucks heading to and from oil wells.
Companies said travel continued to be impacted despite snow fall stopping.
Both Pioneer Natural Resources and Apache Corp, which operate in the basin, said they were still assessing the storm’s effect on operations.
An Apache spokesman said: “Early signs indicate the downtime is manageable and within our expectations for typical winter-weather-related downtime.”
Meanwhile Devon Energy said it was experiencing some weather-related impact to its production in Texas, New Mexico and Oklahoma.
It said it was still undertaking a detailed assessment.
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