简答题 翻译：There are special types of valves designed to be operated by control instrument rather than by hand.

问答题翻译：Exploration methods falling in this category are those employing a physical measurement of subsurface conditions made from a surface location.

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.

问答题翻译：Log interpretation is the process by which these measurable parameters are translated into the desired petrophysical parameters of porosity, hydrocarbon saturation, permeability, producibility, lithology, etc.