问答题 翻译：Petroleum geology is the application of geology (the study of rocks) to the exploration for and production of oil and gas.

问答题 翻译:Usually, the operator sends out an invitation to bid to several drilling contractors who he knows have the equipment and integrity to drill the well to the specifications stated in the bid invitation.

问答题 翻译：cooperation and assistance of the drilling contractor is required in almost every instance.