Research On Information Processing And Methods Of Flow Parameters Measurement In Low Production Horizontal Well

The fluid in the petroleum production logging,especially the horizontal production profile logging,has complex flow conditions,and most oilfields are in high water cut,low yield and always “degassing”,which increase greatly the measurement difficulty of fluid flow parameters.At the same time,the methods and equipments currently have not been applied maturely for the parameter measurement of the oil-water two-phase flow and oil-gas-water three-phase in horizontal production profile logging.Thus in order to meet the actual requirements in the horizontal oilfield production,to keep up with the production conditions in oil wells layers and optimize the oilfield production,it is urgent to develop the new effective measurement methods and techniques for the oil-water two-phase flow and oil-gas-water three-phase flow parameters in horizontal production profile logging.The dissertation conducted a research on the flow parameter measurement theory and key techniques for the horizontal production profile logging fluid,with the actual development strategy of Daqing Oilfield and Jidong Oilfield in the background.(1)Aiming at the problem that the ring-shape electrode conductance water cut meter cannot obtain the pure-water phase calibration values during the water cut measurement for the oil-water two-phase laminar flow in horizontal production profile logging with low yield,the conductance water cut measurement method,based on the combination of ring-shape conductance probe(RSCP)and mini-conductance probe array(MCPA),was proposed,and the geometry of an MCPA sensor,on the basis of analyzing the water cut measurement working principles,was established.And then the simulation models for the MCPA sensor with different axial rotation angles were built,the distribution characteristics of electric filed and spatial sensitivity inside the measurement areas of the MCPA sensor with different structure parameters were analyzed,and the optimization structure parameters of the sensor geometry were obtained.On the basis of these,the response characteristics of the MCPA sensor with different structure parameters in horizontal oil-water laminar flow were investigated,the linear relation between the MCPA and RSCP sensors in different water conductivity conditions was analyzed,and then the feasibility of the method to measure water cut in horizontal oil-water laminar flow with low yield was analyzed through the above simulation.(2)Aiming to the measurement problems of the low sensitivity and oil contamination for void fraction of oil-gas-water three-phase flow in horizontal production profile logging with low yield,a measurement method for void fraction,based on the sapphire fiber-optic probe(FOP),was proposed,the mechanismmodel and simulation model for FOP to measure the void fraction were established,the characteristics of the FOP piercing the bubble in different radial positions and angles were investigated,and the binaryzation processing results for the original signals from the FOP measuring the void fraction were analyzed with single-threshold method,fixed double-threshold method and automatic adjustment double-threshold method.(3)Aim at the measurement problem of pre-existing electromagnetic flow meter cannot obtain the cord sides fluid field information for the flow rate of the oil-gas-water three-phase fluid in horizontal production profile logging with low yield,whose flow field distribution is asymmetric,the complex mixed-phase media multi-electrode correlation flow measurement method,based on the electromagnetic measurement theory,was proposed,the geometry of the multi-electrode double-winding excitation electromagnetic correlation measurement sensor and the simulation model for the excitation magnetic field theory were established,the distribution characteristics of the spatial magnetic induction inside the sensors in different excitation patterns were analyzed,and the system driven circuit structure scheme of the double-winding excitation electromagnetic correlation sensor was designed.(4)The prototype and the data interpretation platform of horizontal production profile logging parameter measurement instrument were designed and developed.For the water cut measurement,the static experiments were conducted to verify the effectiveness of the water cut measurement method,and the dynamic experiments were conducted to analyze the stability of the instrument prototype in different temperature,mineralization degree,and pressure conditions;for the void fraction measurement,the simulation wells experiments were conducted to analyze the processing efficiency for original signals of FOP with different threshold methods and the response characteristics of FOP in different gas amount,and the dynamic calibration experiments for oil-gas-water three-phase flow void fraction were conducted;for the flow rate measurement,the dynamic experiments were conducted on the indoor horizontal multi-phase simulation experiment deviceunder different gas amounts conditions.