The Research Of Thermal Mass Flowmeter Applied To Downhole Liquid Flow Rate Measurment

Turbine flow meter is a commonly used flow-meter in oil field production logging.But for the polymer flooding output wells,there are more solid foreign objects,resulting the traditional turbine flow-meter stuck and can't work.In recent years,the horizontal well technology is also widely used.In the horizontal wells,there are grains of sand and other solid impurities,also make the turbine flow meter which is with moving parts serious reliability issues,it is urgent to develop a flow-meter with high reliability and without moving parts.For this point,this paper proposes a new method to measure down-hole liquid flow measurement with thermal mass flow meters.According to the method,it designs a flow meter which has no moving parts,high reliability,low pressure drop,the ability of adapting the low flow measurement.It has the feasibility of application in the oil wells.In this paper,a measurement method with thermal mass flow-meter for liquid(oil or water)flow in the well has been raised.It uses the loss of heat and fluid flow relationship in the fluid flow through the speed sensor probe to measure fluid flow.By using Fluent to simulate the heating processing and the balanced heating time of heating wire of the thermal mass flow-meter,we can get a curve of the internal temperature distribution and the curve of the heating wire's required time for getting equilibrium.To carry out the feasibility of the experimental study,it designs and processes the hot liquid mass flow meter principle prototype.Laboratory experiments of platinum resistance response characteristics are taken,a single probe and dual probe dynamic experiments in multiphase flow dynamic experimental device achieved the desired experimental results.Experimental results show that the thermal liquid mass flow meter measuring the flow of the liquid phase(oil and water)is feasible.The method provides a new idea for output profile liquid flow measurement,and laid the foundation for the prototype development of the underground scene.