Underground optical fiber flow sensor in oil field
A technology of optical fiber flow and sensor, which is applied in the field of petroleum logging instruments, can solve the problems that cannot meet the environmental requirements of petroleum downhole flow, and achieve the effect of high measurement sensitivity and high measurement accuracy
Active Publication Date: 2013-08-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
It overcomes the shortcomings that the existing optical fiber sensors cannot meet the environmental requirements of oil well flow measurement
Method used
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[0012] Such as figure 1 , figure 2 As shown, an oilfield downhole optical fiber flow sensor includes a light source module 1; the light source module 1 is connected to a polarization controller 2, the polarization controller 2 is connected to an optical fiber coupler 3, and the optical fiber coupler 3 is respectively connected to a phase modulator 4, The Faraday rotator II7 is connected with the photodetector 9, the phase modulator 4, the Faraday rotator I5, and the optical fiber pressure sensitive head I6 are connected in sequence, the Faraday rotator II7 is connected with the optical fiber pressure sensitive head II8, the photodetector 9, the amplifying The circuit 10, the A / D converter 11, and the embedded computer 12 are connected in sequence. The optical fiber pressure sensitive head I6 and the optical fiber pressure sensitive head II8 have the same structure. The optical fiber pressure sensitive head I6 and the optical fiber pressure sensitive head II8 include a stainle...
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Abstract
The invention relates to a petroleum logging instrument, and particularly to an underground optical fiber flow sensor in an oil field. A light source module of the sensor is connected to a polarization controller; the polarization controller is connected to an optical fiber coupler; the optical fiber coupler is respectively connected to a phase modulator, a Faraday rotating head II and a photoelectric detector; the phase modulator, a Faraday rotating head I and an optical fiber pressure sensing head I are connected sequentially; the Faraday rotating head II is connected to an optical fiber pressure sensing head II; and the photoelectric detector, an amplification circuit and an A / D (Analogue / Digital) converter and an embedded computer are connected sequentially. The underground optical fiber flow sensor in the oil field realizes absence of direct function of a fluid and optical waves, can realizes wholly sealed packaging, satisfies fluid flow measurement in a high-temperature and high-pressure severe environment, has high measurement sensitivity and high measurement precision, and overcomes the disadvantage that the conventional optical fiber sensor cannot be satisfied with the environment requirements of the underground flow measurement of petroleum.
Description
Technical field: [0001] The invention relates to a petroleum well logging instrument, in particular to an oil field downhole optical fiber flow sensor. Background technique: [0002] Fiber optic sensors currently used for liquid flow measurement include turbine fiber optic flow sensors, vortex street fiber optic flow sensors, Doppler fiber optic velocity sensors, and fiber optic grating flow sensors. The turbine optical fiber flow sensor has a simple structure and simple signal processing method, but it projects the transmitted light in the optical fiber to the turbine through the spatial optical path, receives the reflected light, and realizes the flow measurement by counting. The strong absorption of light leads to problems such as very weak reflected light, so it cannot meet the requirements of the oil well testing environment. The vortex street optical fiber flow sensor uses the fluid to pass through an obstacle to form two eddy currents in opposite directions, which wi...
Claims
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Login to View More IPC IPC(8): G01F1/38G01F15/16G01D5/26
Inventor 李天诗汪浩代志勇邬洪亮张胜文江松元毛殿余宫继刚马铭强朱秀英赵俊堂郭洪敏杨留强郑磊陶双福周辉宋菲菲王少鹤李颖李华曹艳玲
Owner BC P INC CHINA NAT PETROLEUM CORP