| The oil from the reservoir and natural gas which separates from the oil form the two-phaseflow in pipeline, the phenomenon is universal in oil-gas transport. The liquid-gas two-phaseflow is of special law compared with the single-phase flow. The technology of oil-gas-watermixed transportation, which has been successfully applied in onshore oilfield development anddesert field development. It accelerate the oil field development, reduce early investment,lessen the expense, simplify the operation, and is of the obvious economy.The national and outside experts do some systemic study on two-phase flow, and get a lotachievement. Generally, the pressure drop formula can be separated into three types. The firsttype is homogeneous flow model which think the two-phase flow as single phase flow and getthe friction resistance factor by the examination data. Most of methods belong to the first model.The second type is dispersed flow model, such as Dukler's formula. The third type is flowpattern model in which we first ensure the flow patterns which determines the energy loss andthen choose the formula of the flow patterns. The paper study the pressure drop of thetwo-phase flow in the vertical and horizontal pipeline. Based on the pressure drop, thehydrodynamics and calorifics theory, the paper study the temperature drop law of the two-phaseflow.Accord to the study of the pressure drop and temperature drop, make the calculatingprogram. It is very useful to design and manage the oil-gas transportation pipeline.
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