Study and performance evaluation of high density packer fluid system for oil and gas wells
In this paper,phosphate,high-temperature corrosion inhibitor HSJ-T,high-temperature corrosion inhibitor HSJ-G combined with oxygen deoxidizer HCY-6 were used to study the high-temperature and high-density sealing fluid system suitable for offshore N oilfield,and the performance of the system was evaluated.The evaluation results showed that the density of the packer liquid system can reach 1.60g·cm-3,and the temperature resistance capacity can reach 150℃.The high temperature corrosion of the system was evaluated by using the weight loss method.The corrosion rate of 3Cr-L80 and 13Cr-L80 steel at 150℃ is less than the industry standard of 0.076mm·a-1,showing excellent anti-corrosion performance.The settlement factor method SF was used to evaluate the temperature stability of the packer fluid.When the system was settled at 150℃ for 30 days,the difference between the upper and lower densities is zero,showing good high-temperature settlement stability.The service life of casing and tubing in offshore N Oilfield was predicted by corrosion rate.The predicted results show that the service life of casing with 3Cr-L80 material is 14～19 years,and that of tubing with 13Cr-L80 material is 9～12 years.Acording to the results of system and comprehensive performance evaluation,the studied packer fluid system can meet the production requirements of offshore N Oilfield and similar fields.
high temperature deep wellpacker fluidhigh densitycorrosion performancesettlement stabilitylife in service
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