Steam flow measuring device and method

Abstract

The invention relates to a steam flow measuring device and method for measuring steam flow and heat values on time. The device mainly comprises a monoenergetic gamma sensor, a Venturi flow meter, a temperature transmitter, a pressure transmitter, a steam inlet connecting pipe section and a steam outlet connecting pipe section, and is used for effectively measuring saturated water amount and saturated steam amount of steam in real time. The measuring method comprises the following steps of: measuring section saturated steam dryness by using the monoenergetic gamma sensor; measuring the total steam mass flow by using the Venturi flow meter; and considering possible slippage (relative speed difference) between saturated steam and saturated water. A gas-liquid annular flow slippage analytic solution method is adopted, so that the saturated steam amount, saturated water amount and corresponding heat values can be computed in real time by using a computer system. By adopting the measuring method, steam and liquid phases in steam can be distinguished and measured directly. Compared with the conventional single-phase measuring and density correcting method, the method has the advantages of no additional error, no influence by the flow form and gas-liquid phase change and higher measuring accuracy.

Description

technical field [0001] The invention relates to the technical field of on-line metering of steam flow and calorific value, especially a steam flow metering device that can be used to realize real-time metering of injected steam during oil field steam-driven heavy oil production. The metering method of the device metering the steam flow. Background technique [0002] Steam is an important secondary energy source for petrochemical companies. From the perspective of corporate benefits, reducing production costs requires reducing steam consumption. When it comes to energy saving and consumption reduction, the first thing is energy measurement. In the process of heavy oil production driven by oilfield steam, only when the injected steam is accurately measured can the quantitative index of energy saving be clarified. In recent years, in the continuous exploration and development of domestic heavy oil resources, more than 90% rely on steam huff and puff or steam drive for heavy oi...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the inability of traditional instruments to track the phase change state in steam measurement in real time, and to provide a technical route using single-energy gamma to measure steam dryness and Venturi to measure total mass flow, which can directly measure steam on-line The respective masses of the two phases of vapor and liquid in the middle, thereby obtaining a kind of steam flow metering device for the total flow calorific value, the invention also provides a metering method for using the metering device to meter the steam flow

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