Ying Shang

Research of Optical Fiber Fluid Flow Monitoring System Based on Flow-Induced Pipe Vibration

In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, and fluid flow is measured non-intrusively, the study is conducted on vibration induced by turbulent flow when fluid flow through pipe. The frequency characteristics of the pipes vibration signals is found,then the fixed relationship between standard deviation of pipe walls vibration induced by fully developed turbulence and mean flow rate is determined.

Phase and frequency noise measurement using passive self-homodyne technique

Abstract. For single longitudinal-mode lasers, the phase and frequency noises are very important parameters for their applications. The passive self-homodyne technique with an unbalanced Michelson interferometer is demonstrated to measure the phase and frequency noise characteristics. The Michelson interferometer for measurements is composed of a 3×3 optical fiber coupler and two Faraday rotator mirrors. The measurement performance is derived and discussed strictly from the transmission matrix of the coupler. The influence to the demodulation resulting from the asymmetry of the 3×3 optical fiber coupler is eliminated through the derived relationship between the differential phase fluctuation and the interferometer fringes. The technique is utilized to measure the phase and frequency noise features of a distributed feedback fiber laser. Based on the measured frequency noise spectrum, the lineshape, linewidth, and phase-error variance related to the laser coherence are able to be calculated and discussed well.

Design for a new fiber optic interferometer of water cut meter in oil well logging

With the continual advancement of oil field development, water cut is an extremely important parameter which determines the transmission characteristics of the oil production and provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A new water cut meter based on fiber optic interferometer is proposed, sound pressure signal on the pipe is generated when the acoustic wave is propagated in a mixture of the pipe, the fiber optic sensors wrapped closely around the outside wall of pipe is capable of sensing sound pressure signal, the use of phase-carrier technology aloud sound velocity is solved out through the method of Phase Generated Carrier(PGC)and sound pressure spectrum, then water cut can be solved according to the relationship between sound velocity and water cut.

Research on optical fiber flow test method with non-intrusive

In the field of oil well logging, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery, so the non-intrusive flow test method based on turbulent vibration is proposed. The specific length of sensor fiber wound tightly around the outer wall of the pipe is connected with the optical fiber gratings at both ends, the sensor fiber and the optical fiber gratings compose the flow sensing unit. The dynamic pressure is generated by the turbulence when fluid flows through the pipe, and the dynamic pressure results in the light phase shift of the sensor fiber. The phase information is demodulated by fiber optic interferometer technology, time division multiplexing technology and Phase Generated Carrier modulation and demodulation techniques. The quadratic curve relationship between phase change and flow rate is found by experimental data analysis, and the experiment confirms the feasibility of optical fiber flow test method with non-intrusive and implements the realtime monitoring of flow.

Study of Optical Fiber Fluid Flow Monitoring System Using Pipe Vibration Frequency Characteristic

In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, then the fixed relationship between standard deviation of pipe wall’s vibration induced by fully developed turbulence and mean flow rate is determined, by the abundant experimental data analysis,The vibration frequency characteristic of the pipe’s vibration signals is found in the experimental system.and fluid flow is measured non-intrusively, the study is conducted on vibration induced by turbulent flow when fluid flow through pipe.

Design for a New Type of Water Cut Meter Based on Fiber Optic Interferometer Used in Oil Well Logging

With the continual advancement of oil field development, water cut is an extremely important parameter which determines the transmission characteristics of the oil production and provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A new type of water cut meter based on fiber optic interferometer is proposed, sound pressure signal on the pipe is generated when the acoustic wave is propagated in a mixture of the pipe, the fiber optic sensors wrapped closely around the outside wall of pipe is capable of sensing sound pressure signal, the use of phase carrier technology aloud sound velocity is solved out through the method of Phase Generated Carrier (PGC) and sound pressure spectrum, then water cut can be solved according to the relationship between sound velocity and water cut.

Research of Optical Fiber Fluid Flow Monitoring System Using Flow-Induced Pipe Vibration in the Oil Production

In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, then the fixed relationship between standard deviation of pipe wall’s vibration induced by fully developed turbulence and mean flow rate is determined.The advantage of this method is applicable to small flow measurement with non-intrusively.

Introduction of new optical fiber monitoring system of fluid flow with nonintrusion

In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors non-intrusively sensing fluid flow is proposed, those sensors are positioned between pairs of low reflectivity fiber Bragg gratings, the fiber optic sensors wrapped closely around the outside wall of pipe are used to sense the internal information of fluid flow, new optical fiber monitoring system of fluid flow bases on optical signals. When optical signals are transported in optical fibers, phase is changed due to the effects of the fluid flow , the size of which can be determined by measuring the relative changes of the phase. So the optical fiber monitoring system of fluid flow making use of modulation and demodulation techniques of phase generated carrier accurately determines the size of fluid flow with non-intrusion.