| 【文章摘要】 <正>PetroChina Great Wall Drilling Co., Ltd. and Petroleum Com-pany of Cuba held a ceremony for signing two drilling service contracts on Nov. 3, 2005.It is the second-time coop-eration between Great Wall Drilling Co., Ltd. and Petro-leum Company of Cuba after the signing of a one-year pe-troleum service agreement on one 1500HP drilling rig and one 2000HP rig on April 8 this year. The contract signed this time includes three 2000HP |