The Lavaca County Sheriff's Office says the accident happened Wednesday night between Shiner and Yoakum. The area is about 80 miles east of San Antonio.
A spokeswoman for the operator, Houston-based EOG Resources, Inc., says the fire continued to burn Thursday. K Leonard described the accident as a "well control incident" and authorities are trying to determine what sparked the blaze.
Leonard says all personnel have been accounted for. She didn't have specifics on how many workers were at the site when the fire started.
The Houston-based firefighting company Wild Well Control will assist in the response.
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