Research on the Two-phase Flow Measurement of Condensate Natural Gas

摘要

This research is on the implementation of online non-separation flow measurement of gas-liquid two-phase condensate natural gas. The V-cone throttle device, which has the shrinkage characteristics of fluid-flux sectional area along the outside surface of its core and the inside surface of its pipe wall, and the venturi throttle device, which has the shrinkage characteristics of fluid-flux sectional area along the center of its tube, are assembled. Then the two overreading measurement models are built up according to the different characteristics of the two overreading measurement values and their inherent law respectively. Using the iterative correction method repeatedly, the flowrates of the gas-liquid two-phase can be implemented respectively. Taking a prototype with DN80 diameter designed and made for example, with the experimental devices of the wet gas flow measurement, the experimental research and the performance verification of the prototype is carried out in the flow laboratory of TianJin Univercity. The results indicate that the error limits of gas flowrate and liquid flowrate are less than ±2% and less than ±10% respectively. Meantime, a series of experimental research and performance verification are carried out in industrial fields of Southwest oil and gas fields of Petro-China. The results showed that the accumulated flow error of both the gas and the liquid is less than 1% respectively.