Reverse On Flow Parameters Measurement Method Of Oil-water Two-phase Flow In Horizontal Well Based On Thermal Method

With the continuous development of petroleum industry,horizontal well technology has been widely used in domestic and foreign major oil and gas fields.Horizontal Wells can improve the productivity of oil and gas Wells,help to achieve high production of thin Wells and reduce production costs.In horizontal well logging,flow pattern,flow rate,flow rate and oil concentration are all very key detection parameters.Accurate measurement of these parameters is of great practical significance for scientifically making water injection recovery plan,ensuring optimal production and stable production.As the oilfield gradually enters the later stage of recovery,the water content in the oilwater two-phase flow in horizontal Wells keeps increasing and even appears extremely high water content.At the same time,the fluid viscosity in horizontal Wells is high and sand production is serious,so the conventional measuring instruments are prone to sand jam and it is difficult to work normally,thus causing new difficulties.To solve this problem,a method for measuring the flow parameters of oil-water two-phase flow based on the thermal method was proposed,and the relevant parameters in the method were optimized.COMSOL was used to simulate the transient change process of the fluid after the oil-water two-phase flow was concentrated in the horizontal pipe under the condition of different flow velocity and water content.The time needed for the oil-water two-phase flow to reach the stable state in horizontal pipeline is obtained.The shape of heat source,material,length,heating time and installation position of temperature sensor are numerically simulated.Based on the analysis of the simulation results,the optimal parameters of the thermal method to measure the flow velocity are as follows: the material of the pulse internal heat source is aluminum,the shape is rectangular,the length is 3mm,the pulse heating time is 1s,and the temperature sensor is installed at 200 mm away from the entrance;The optimal parameters of water content measurement by thermography method are as follows: rectangular shape should be selected when the water content is high;cylindrical shape should be selected when the water content is low;the heat source material is aluminum with a length of 3mm;the distance between temperature sensor and heat source is 250 mm.According to the results of numerical simulation,an oil-water two-phase flow parameter measuring instrument based on heat is optimized.The experimental results in the simulated well show that the accuracy of the measurement system is improved by this design scheme.The instrument showed good repeatability in horizontal Wells with flow rates of 0.062 to 0.384 m/s and water cut of 90% to 30%,and the maximum error of the instrument was within 5%.The instrument is suitable for high water cut and low liquid production situations.It has no moving parts and can be used to measure velocity and phase holdup of high water Wells.