Downhole steam flow and mass dryness fraction measurement method and measurement instrument

Abstract

The present invention discloses a downhole steam flow and dryness fraction measurement method and its measuring instrument. The measurement method in includes measurement of difference pressure and vortex-shedding frequency. Its steps are: (A). the described measurement of difference pressure and vortex dropping frequency uses the integrated measuring instrument with vortex-shedding frequency generator, difference pressure sensor and vortex-shedding sensor to make measurement.; and (B) it utilizes the measured throttle difference pressure and vortex-shedding frequency and uses the two-phase flow measuring formula corrected simultaneously by using flow rate coefficient and density coefficient to make simultaneous resolution so as to obtain the downhole steam flow rate and dryness fraction.

Description

1. Technical field [0001] The invention relates to measurement, in particular to a method for measuring downhole steam flow and dryness and a measuring instrument. 2. Background technology [0002] In the heavy oil thermal recovery process, in order to rationally inject steam and recover oil, it is necessary to measure the steam injection parameters such as downhole flow rate and dryness during the steam injection process, so as to accurately analyze and grasp the steam injection effect and improve the thermal recovery level. However, the similar measurement methods and instruments currently available cannot meet the needs of heavy oil thermal recovery technology. There is a method and instrument for testing steam flow and dryness. It uses the pulsation characteristics of the two-phase flow in the horizontal pipeline on the ground to measure the steam flow and dryness downhole. Due to the limitations of test conditions such as the inner diameter of the pipeline is too small...

AI Technical Summary

Problems solved by technology

However, the similar measurement methods and instruments currently available cannot meet the needs of heavy oil thermal recovery technology.

There is a method and instrument for testing steam flow and dryness. It uses the pulsation characteristics of the two-phase flow in the horizontal pipeline on the ground to measure the steam flow and dryness downhole. Due to the limitations of test conditions such as the inner diameter of the pipeline is too small, the pulsating noise signal of the pressure difference is difficult to measure after damping, so the method and instrument are complicated to operate in the measurement of downhole steam flow and dryness, and the measurement accuracy is low; It is also very difficult to measure downhole steam flow and dryness parameters with other throttling element combinations

Images