简答题 翻译：The casing and tubing used to bring crude oil to the surface is suspended underneath a wellhead or Christmas tree.

问答题翻译：Other instruments used in gravity work are the torsion balance and the pendulum.These instruments, however, have been practically replaced by the gravimeter.

问答题翻译：The permeability of a porous medium may be determined from samples extracted from the formation or by in-place testing.

问答题翻译：The main function of a rotary rig is to drill a hole, or as it is known in the industry, to make hole.

问答题翻译：Finally, it should be noted that the effective compressibility of an oil-gas mixture below its bubble point pressure is large, since much of the volume decrease with pressure increase is associated with the change in phase of some the gas to a liquid.

问答题翻译：The gas formation volume factor Bg is the volume measured at reservoir conditions that corresponds to a unit volume of gas at standard conditions. Thus, Bg<1.