Research On Sand Monitoring Method Based On Acoustic Signature Analysis

Moderate sand production is a selective and limited sand control strategy that allows the well to yield as high as possible without subsidence of the formation without excessive damage to the production facility.In order to achieve proper sand production,it is necessary to control the well sand production within a reasonable range.Therefore,it is necessary to monitor the status of sand production in real time.It is of great importance to study the monitoring of sand production by obtaining the grit parameters such as the amount of sand produced and the grain size of sand produced.Based on the research status quo at home and abroad,this paper combines the existing conditions and research progress of the laboratory,and proposes a sand monitoring method based on acoustic signal feature analysis.The installation position of the acoustic sensor was confirmed by numerical simulation and experimental verification.Then the laboratory gas-solid two-phase flow and liquid-solid two-phase effluent sand monitoring simulation device was used.The indoor simulation of sand production parameters under different working conditions in the site was analyzed.The sound signal characteristics under the variable,completed the acoustic sensor indoor evaluation experiment.According to the principle of reflection and focusing of sound waves,the focusing devices of two kinds of acoustic sensors,paraboloid and concave spherical,have been designed,and the designed focusing device has been proved to have good magnification and focusing effect under low frequency conditions.The low frequency magnification of the 4944 sound sensor is 3.78 times.The low frequency amplification of the 4189 acoustic sensor is 3.29 times.In order to determine the installation position of the sensor,the numerical simulation using COMSOL erosion and the gas-solid two-phase flow sand impact test verify the simulation results.The results all indicate that the dominant factor influencing the installation position of the sensor is the particle diameter,which decreases with the particle diameter.The pipe diameter is gradually increased,and finally it is in a stable state.The erosion simulation result is stable at 2 pipe diameters.The result of the verification experiment is stable at 1.5 to 2 pipe diameters;the flow rate and sand content hardly affect the installation of the sensor.Location;Erosion simulation results are consistent with the verification experiment law;thus determine the sensor's installation position at 1.5~2 times the pipe diameter.The analysis of acoustic signal characteristics is divided into two parts.The first part is to evaluate the monitoring effects of the 4494 and 4189 acoustic sensors in the gas-solid twophase flow by changing the particle diameter and flow velocity.The contrast between the parabolic and concave spherical focusing effect is optimized and the monitoring effect is optimized.Good 4944 acoustic sensor and concave spherical focusing shell.The second part is to evaluate the monitoring effect of the preferred acoustic sensor 4944 in the liquid-solid twophase flow.The signal band feature extraction processing method is used,and the 20~25 KHz frequency band is preferably used for the experimental results processing of liquid-solid twophase flow.According to the analysis of acoustic signal characteristics,under the single variable experimental conditions,the 4944 acoustic sensor has a strong ability to identify sand signals.With the increase of particle diameter,sand content and flow velocity,the amplitude of acoustic signals increases.The law is obvious.It laid the foundation for the follow-up study of sound measurement and field applications.