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.