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

A technology of steam flow and measurement method, applied in the field of measurement, can solve the problems of inability to meet the needs of heavy oil thermal recovery process, difficulty in measuring dryness parameters, low measurement accuracy, etc., and achieves convenient measurement, wide measurement range and high precision. Effect

Inactive Publication Date: 2004-02-25
OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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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

Method used

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

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Embodiment Construction

[0031] A method for measuring downhole steam flow and dryness, comprising measuring differential pressure and vortex shedding frequency, the measurement of the differential pressure and vortex shedding frequency described in step (A) is to use a vortex frequency generator, a differential pressure sensor, a vortex The measuring instrument of the combination body that sensor constitutes is carried out; Step (B) described differential pressure also is the differential pressure that measuring instrument itself produces to the throttling action of fluid, and described vortex shedding frequency is that vortex street frequency generating body produces to injection steam The vortex street frequency signal, the signal collected by the vortex street sensor is recorded in the downhole data acquisition system of the surveying instrument; step (C) stores the choke pressure difference and vortex street frequency data measured by the surveying instrument in the downhole data acquisition system...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/34G01N7/00
Inventor 代培文王作青吴国伟吉树鹏隋斌聂燕飞姜责菊刘希明霍刚王来胜
Owner OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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