PATTERSON-UTI ENERGY, INC. $300,000,000 4.27% Series B Senior Notes due June 14, 2022 NOTE PURCHASE AGREEMENT Dated June 14, 2012Guaranty Agreement • June 18th, 2012 • 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:
