Research On Suppression Of Pipeline Vibration Interference For Sand Production Monitoring Of Oil And Gas Wells

Sand production in oil and gas wells is one of the common problems encountered in the process of oil extraction.Excessive sand production can cause pipeline damage and affect the efficiency of oilfield production.Sand production monitoring uses sensors to convert the vibration signal generated by sand particles hitting the pipe wall into electrical signals.The amount of sand produced is judged according to the strength of the vibration signal,and the vibration of the pipeline will seriously affect the accuracy of sand production monitoring.Aiming at this problem,this article mainly analyzes the interference sources that cause pipeline vibration,and studies the interference suppression method of sand production monitoring based on ultrasonic array.This article first analyzes the occurrence of sand production and signal characteristics.In order to reduce the impact of pipeline vibration on sand production monitoring,the main interference sources that cause pipeline vibration around the well site are analyzed.According to the characteristics of the interference signal and the propagation path,the ultrasonic array sand production monitoring method is adopted to enhance the identification ability of the sand production signal,and realize the multi-parameter estimation of the sand production signal.According to the characteristics of the vibration signal and the size of the pipeline,a onedimensional linear ultrasonic array structure composed of 8 array elements is established,and a receiving model of the array signal is established.On this basis,a multi-channel data acquisition system for on-line monitoring of sand production has been developed.The system is based on FPGA and adopts a 3 core architecture of 2+1.The specific functions are as follows: 2 FPGAs control 4 ADs to realize 8-channel data high-speed synchronous acquisition,buffering and logic control functions.The other piece of FPGA uses UDP protocol to transfer 8-channel data to the host computer for display and processing in an orderly manner through the gigabit network port.In addition,according to the installation position of the sensor and the propagation direction of the vibration interference signal,an adaptive side-lobe destructive interference suppression method based on the near-field model is proposed.From the spatial perspective,the delay difference between the received signals of each element is used to maximize the output power in the direction of the incoming wave of the sanding signal,and the interference direction forms a resistive state,thereby achieving interference suppression.Finally,based on the ultrasonic array sand production monitoring system,an indoor sand production experiment platform was built,and a large number of sand production simulation experiments were carried out.And by comparing the amount of sand before and after interference suppression,the effectiveness of the adaptive sidelobe destructive interference suppression algorithm is verified.The experimental results show that the method proposed in this paper can effectively improve the anti-interference ability of the sand production monitoring system and improve the accuracy of sand production monitoring.