Research On Ultrasonic Array Imaging Method For On-line Monitoring Of Sand Production In Oil And Gas Wells

Sand production from oil and gas wells is a common phenomenon in the collection of oil and gas resources.Sand production will bring harm to the entire oil and gas resource collection project.However,the existing sand production monitoring instruments are multi-functional and single,lacking a visual display of sand production from oil and gas wells.In response to this problem,this paper studies the ultrasonic array imaging method for online monitoring of oil and gas well sand production.The sand production monitoring method proposed in this paper is based on the sand production signal picked up by the array sensor impacting the oil well pipe wall for imaging processing.In the process of sand monitoring of phased array,the distance between the acoustic wave generated by the impact of sand particles and the array elements in the array sensor is different,so the ultrasonic signals collected by different array elements in the phased array will have a phase difference.Based on the phase difference of the signal collected by each array element,the output of each array element is weighted and summed,and the array beam is "steered" in one direction within a time.The position where the maximum output power is obtained for the desired signal is the Poda The estimated value of the direction,that is,the position of the sand impact.Aiming at the above-mentioned methods,this paper firstly studies the performance of the linear array that constitutes the area array,and determines the performance parameters of the linear array through Matlab simulation.Secondly,two area array models suitable for sand production monitoring are proposed.The corresponding simulation models are established by Comsol simulation software,and the two area array models are studied and simulated.Then,according to the sand production monitoring method proposed in this paper,the corresponding signal acquisition and processing system is designed and produced.The delay time of the acquisition system is studied specifically to determine that the designed acquisition system basically meets the requirements of the monitoring method.Finally,a simulation experiment platform for sand production from oil and gas wells was built indoors,and the actual sand production was simulated by the way of sand and gravel hitting the steel plate.The experimental results show that the designed ultrasonic arrayimaging method for online monitoring of sand production in oil and gas wells can realize the imaging of the impact point of sand particles,and realize the self-adaptive calculation of the sand output based on the change of the impact position of the sand particles,which can effectively improve the accuracy of sand monitoring.