Lesson 13-2 The search for oil
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 gas 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.
geologist 地质学家
coring bit 取芯钻头
every so often 时常
cylinder /ˈsɪlɪndər/ 圆柱体
stratum /ˈstreɪtəm/ 岩层，地层; 复数 strata /ˈstreɪtə/
by means of 用。。。手段
circulate /ˈsɜːrkjəleɪt/ 循环;(液体或气体)环流;
gusher /ˈɡʌʃər/ 喷油井
endeavour /ɪnˈdevər/ 努力;尽力;竭力
lead off 开始;带头;起始于（某处）;启动
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