...them presenting the defense of novation of contract, and such a plea would have been inconsistent with the further plea by them, and evidence introduced in support thereof, that the company had...sued. In order to create a novation of contract, it would have been necessary for the defendant company to become a party to the novation agreement, and for plaintiffs to agree to discharge the...company, situated in Wichita county. By the terms of that contract the company agreed to furnish all derricks, fuel, water, slush pits, casing, cement, and finishing equipment fuel oil, and water tanks...