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, low measurement accuracy, measurement difficulty, etc., and achieve the effects of convenient measurement, wide measurement range and easy manufacturing
Inactive Publication Date: 2006-12-20
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, which uses the pulsation characteristics of the two-phase flow of the horizontal pipeline on the ground to measure the steam flow and dryness downhole. Due to the limitations of test conditions such as long pipe diameter and too small inner diameter, it is difficult to measure the pulsating noise signal of pressure difference after damping. Therefore, 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
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[0016] A method for measuring the flow rate and dryness of downhole steam, including measuring the differential pressure and using a vortex frequency detector to detect the frequency of alternate shedding of vortices on both sides of the vortex frequency generator, and converting the frequency into zero drift by the vortex sensor The pulse frequency signal, the differential pressure is the differential pressure generated by the measuring instrument itself on the fluid throttling effect, the differential pressure sensor transmits the signal to the downhole data acquisition system of the measuring instrument, and the throttle collected by the downhole data acquisition system of the measuring instrument Flow differential pressure, vortex street frequency, and the two-phase flow formula that is simultaneously corrected by the flow coefficient and density coefficient can be solved simultaneously, and the downhole steam flow, dryness, the frequency of the vortex shedding alternately a...
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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, which uses the pulsation characteristics of the two-phase flow of the horizontal pipeline on the ground to measure the steam flow and dryness downhole. Due to the limitations of test conditions such as long pipe diameter and too small inner diame...
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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