Dear George,
Have you sent a demand letter to Chevron? I will surmise that they are the Operator. Sometimes, with oil wells, the payment is made by the oil purchaser.
There is protection in the Texas Code. You are entitled to interest and damages. You would want to make that part of your demand. Also, if you have the well name, I will check online at the Railroad Commission to get the API number (that is an unique number that identifies the well) so that when you contact Chevron, you will have a well name and API to solidify your demand.
Best,
Buddy Cotten