<div id="s6jhf"><tr id="s6jhf"><object id="s6jhf"></object></tr></div>
            1. 新概念英语文本第四册Lesson 13 The search for oil探寻石油_新概念英语青少版1a

              2017-03-17 11:50



              Lesson 13

              The search for oil探寻石油

              First listen and then answer the following question.听录音,然后回答以下问题。新概念英语青少版1a

              What do oilmen want to achieve as soon as they strike oil?

              The deepest holes of all made for oil, and they go down to as much as 25,0000 feet. But we not need to send men down to get the oil our, as we must with other mineral deposits. The holes are only borings, less than a foot in diameter. My particular experience is largely in oil, and the search for oil has done more to improve deep drilling than any other mining activity. When is has been decided where we are going to drill, we put up at the surface an oil derrick. It has to be tall because it is like a giant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.

              The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through. Once we get down to the oil, it usually flows to the surface because great pressure, either from or water, is pushing it. This pressure must be under control, and we control it by means of the mud which we circulate down the drill pipe. We endeavour to avoid the old, romantic idea of a gusher, which wastes oil and gas. We want it to stay down the hole until we can lead it off in a controlled manner.

              T.F.GASKELL The Search for the Earth's Minerals from Discovery

              New words and expressions 生词和短语

              mineral adj. 矿物的boring n. 钻孔derrick n. 井架block and tackle滑轮组haul v. 拖,拉rotate v. 使转动cutting bit钻头geologist n. 地质学家coring取芯钻头cylinder n. 圆柱体strata n. 岩层[复]([单]stratum或strata [误用])

              circulate v. 注入,环流gusher n. 喷油井








              凡本网注明"稿件来源:新东方"的所有文字、图片和音视频稿件,版权均属新东方教育科技集团(含本网和新东方网) 所?#26657;?#20219;何?#25945;濉?#32593;站或个人未经本网协议授权不得转载、链接、转贴或以其他任何方式复制、发表。已经本网协议授权的?#25945;濉?#32593;?#33606;?#22312;下载使用?#21271;?#39035;注明"稿件来源:新东方",违者本网将依法追究法律责任。




                  <div id="s6jhf"><tr id="s6jhf"><object id="s6jhf"></object></tr></div>

                              <div id="s6jhf"><tr id="s6jhf"><object id="s6jhf"></object></tr></div>