will an attorney take a wrongfull termination case against against an oil drilling company on a contingency basis?

In Texas, an employer may fire an employee with or without notice for any reason or no reason.  This is called At-Will employment.  The only exceptions to this rule are: 1) the employee has a contract with the employer; 2) the reason for termination has been prohibited by statute eg race, sex, age, national origin, color, religion, disability, age, retaliation for making an OSHA, EEOC, FLSA or Texas Workers' Comp report or claim; 3) the termination was caused by the employee's refusal to commit a criminal act.  There is no fairness requirement in this rule. Under the facts you have provided above, I predict that you will have difficulty finding an attorney to take this case on any fee basis.  However, before you decide to walk away from the issue, call your nearest big-city bar association. Most will have a lawyer referral service, where you can find an employment attorney who will consult with you for a very minimal fee (Tarrant County is $50.00, I think).  That person can tell you with some certainty whether or not you have a case.