Research On Gas Holdup Measurement Of Oil-Gas-Water Three-Phase Flow Based On Sapphire Optical Fiber Probe Sensor

The multiphase flow system is widespread in nature and industrial production. And the parameters detection of oil-gas-water three-phase flow is always one of the hot issues of modern petroleum industry. It is of great importance to measure the oil-gas-water gas holdup and the flow parameter measurement is one of the main topics. However, because of the complexity of the characteristic of the oil-gas-water three-phase flow and the randomness of oil-gas-water multiphase flow process, it becomes difficult to measure the gas holdup. Therefore, a method of gas holdup of gas-liquid measurement of oil-gas-water multi-phase flow based on optical fiber probe has been studied in this paper. It provides a feasible method for accurate measurement of gas and liquid phase gas holdup of oil-gas-water three-phase flow.Firstly, aiming at an optical fiber probe sensor head held gas rate sensitivity problem for traditional fiber probe sensor measurement. The oil-gas-water three-phase flow sensor detection system, the method of simulation the sensitive head shape of the optical fiber probe is studied. Optimized fiber probe sensor materials, fiber probe the sensitive head shape and fiber-optic probe the sensitive head angle through the establishment of the simulation model. To verify the feasibility of a fiber-optic probe measurements of gas holdup, and provides a theoretical basis for the fiber probe sensor system to optimize the design of the optical path.Secondly, aiming at the problem of low signal amplitude are susceptible to noise interference, for traditional fiber probe sensor output optical fiber the probe sensor light path system optimization method is studied. By the simulation model on the one hand the transmission portion of the sensor optical path of the optical fiber probe optimization, proposed the cluster type optical path optimization program; the other hand, proposed a method to install the lens in the light source before to achieve the optimization of the optical path of the light source on the optical fiber probe sensor excitation, for hydrocarbon water three-phase flow of gas holdup measurement dynamic experiments provide adequate theoretical basis. Finally, developed sapphire fiber probe sensor, fiber the probe outer layer wrapped stainless steel casing, the front-end for sensitive adhesive sapphire sensitive head, back-end circuit sealed tube includes a light source emitting circuit, power receiving circuit. Gas holdup measurement experiment platform based on developed sapphire fiber probe sensor is established. Respectively, in the two-phase flow of gas and water, oil and gas two-phase flow and gas-water three-phase flow conditions the gas holdup measurement dynamic experiments, collecting raw data validation developed sapphire optical fiber probe sensor to measure the feasibility of gas holdup.