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? 地質(zhì)學(xué)家
coring bit 取芯鉆頭
every so often? 時常
cylinder?/?s?l?nd?r/ ?圓柱體
stratum /?stre?t?m/?巖層静盅，地層;??? ? 復(fù)數(shù)? ?strata?/?stre?t?/?
by means of 用。。蒿叠。手段
circulate?/?s??rkj?le?t/?循環(huán);(液體或氣體)環(huán)流;
?gusher?/?ɡ???r/?噴油井
endeavour?/?n?dev?r/?努力;盡力;竭力
lead off??開始;帶頭;起始于（某處）;啟動
