Research On Visual Perforation Analysis And Fracturing Evaluation Method Of Oil And Gas Wells

The development of unconventional oil and gas resources relies on horizontal well staged multi-clusters hydraulic fracturing technology,which mainly achieves uniform initiation of fractures in various perforation tunnels.Due to the limitations of high temperature and pressure in the actual underground environment,dynamic monitoring of perforation after fracturing faces serious challenges.Therefore,The downhole perforation images used in this article are obtained by combining a crawler and a forward looking ultra wide angle logging tool,and an intuitive visual fracturing evaluation method for perforation parameters is proposed.The main job responsibilities are as follows:(1)Based on the perforation pressure drop model and advanced application cases abroad,the impact of perforation parameters on fracturing is analyzed.The downhole perforation data is obtained by combining the logging winch,crawler,and forward looking ultra wide angle logging tool with the ground system.The methods of perforation image enhancement,denoising,and unfolding transformation are studied to improve the accuracy of perforation parameter measurement.A cluster of perforation parameter data is measured and statistically analyzed,and the fracturing effect is presented as a trend evaluation by the data.(2)The perforation parameter evaluation fracturing software is designed and realized.Based on the Qt software platform and C++ programming language,the module design of the software is completed according to engineering application requirements.The software is divided into three functional modules: image preprocessing,quantitative measurement,and data statistical analysis.The actual downhole perforation images are processed through image enhancement,denoising,and circular unfolding operations.After unfolding,the erosion area,roundness,diameter,and circumference parameters of the perforation images are quantitatively measured,and the obtained data is statistically analyzed and displayed in the form of charts.(3)Combining practical engineering cases,the fracturing effect is evaluated based on the trend of perforation parameter data,taking perforation clusters and perforation sections as units.520 perforations in the guan ×× well were measured and 4160 perforation parameter data were obtained.The obtained data were statistically analyzed and it can be concluded that the fracturing of 1-10 perforations in the 11 perforation sections is relatively uniform,and the significant difference in perforation parameters between the two clusters in the 11 th section leads to uneven fracturing of the section.This means that some perforations are overfractured,while the other perforations are not fully fractured or even unable to be initiated.The results indicate that staged multi-clusters hydraulic fracturing in horizontal wells can be visually evaluated by perforation parameters,and the fracturing method can provide a scientific basis for improving fracturing technology,improving oil and gas well productivity,and long-term oil recovery.