Research on Coiled Tubing Downhole Television Operation and Fracturing Sand Injection Evaluation System
Volume fracturing is often conducted for shale oil and shale gas in the process of oil and gas field development both in China and other countries,and auxiliary evaluation needs to be performed on the fracturing system effect and deliverability.The use of downhole television to obtain downhole static or kinetic images can di-rectly visually present the real situation in the well,and the use of software to quantitatively analyze the number and size of perforations has unique advantages in the post-fracturing pay formation evaluation that other logging methods do not have.In order to address the issues such as coiled tubing downhole television operation,calcula-tion of sand injection volume and deliverability evaluation after fracturing,a set of coiled tubing downhole television operation ground supporting equipment was developed,including 3 important technologies of milling,flushing and downhole television logging as well as downhole tool supporting scheme.The python+OpenCV recognition technolo-gy was used to develop image preprocessing modules such as camera calibration,image enhancement and eccen-tricity correction.Meanwhile,the YOLOv5+Deepsort neural network was used to form feature object detection and tracking technology;finally,combined with perforation erosion theory and sand injection volume analysis,the C#was used to develop a set of fracturing sand injection evaluation system including basic components,perforation quantitative analysis project and report output.The research results provide certain technical support for the evalu-ation of shale oil and gas deliverability.
coiled tubingdownhole televisionfracturingsand injection evaluationsystem study
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