Findning Synonymous VocabularyFind the words from the article that are close in meaning to the italicized-words. The words are given in order of their appearance. 1. Sometimes oil cannot flow through the porous rock because the 2. Torpedoes filled with nitroglycerin are caused to explode by a special 3. Sometimes when the drill strikes an oil pool, the oil and gas, under 4. Without a control head the derrick could be destroyed. 5. A great deal of oil was spent for nothing and lost when a well gushed. 6. Oilmen used to greet gushers as a sign of oil, but were afraid of them. 7. At the top of the head is a strange object called a Christmas tree. 8. Each pipe of a Christmas tree is provided with a control valve. Oil Recovery 95
9. If the flow is light, only a few valves are opened; with more pressure, 10. The oil is allowed to flow to every tank on the plot. 11. The Christmas tree keeps the pressure constant in the oil reservoir. 12. When even pumping cannot bring the oil up, the well is given up.
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