问答题 翻译：Water and acid gases are removed from the wellhead gas stream because they can cause corrosion and other problems in long distance pipeline and associated equipment.

问答题 翻译：Also specified in gas purchase contracts is the maximum amour of sulfur the sales gas may contain.

问答题 翻译：One has only to think of oil deposites on the shore of the Arctic ocean or in the jwngles on the interiors slops of Amazon basin to realize the difficulties are involved in getting the oil from the well to the cousumer.