The wells around Longview are shallow "pumpers" with pumpjacks dotting the landscape.
The Longview field has been in play almost as long as Spindletop.
The casing is old.
More than likely, the surface casing from a nearby well is ruptured and the small amount of gas lift has pushed the oil up through the ground into her living room.
The Texas Railroad Commission will come in and pressure test every well until they find the culprit, then that well will be plugged all the way to the top to protect the ground water.
Whomever is the owner of that well will be responsible for the cleanup and the cleaning of Leila Letourneau's carpets.