PATTERSON-UTI ENERGY, INC. $300,000,000 4.97% Series A Senior Notes due October 5, 2020 NOTE PURCHASE AGREEMENT Dated October 5, 2010Guaranty Agreement • October 6th, 2010 • Patterson Uti Energy Inc • Drilling oil & gas wells • New York
Patterson-UTI Energy, Inc., a Delaware corporation (the “Company”), agrees with each of the purchasers whose names appear at the end hereof (each, a “Purchaser” and, collectively, the “Purchasers”) as follows:
