Abstract Oil and gas leakages represent the (functional) failure mode as a result of sealing failure of thread connections. With the expectation for more safer and efficient operations during the exploration and production phase of oil and gas fields, Oilfield Country Tubular Goods (OCTG) require the use of thread compounds (pipe dope) to lubricate tubular connections during installation, provision of high resistance to presence of galling and ascertain a consistent friction coefficient, thus importantly to improve the sealing performance of API standard connections or among other expectations. In the period of improvement and upturning procedures for thermal enhanced oil, high temperature fluids (around 300 °C) with the production wells having a lower production temperature.To characterize the long-term sealing performance of OCTG threaded connections, this paper presented the experimental comparative studies and, the effect of viscosity degradation of five different types of thread compounds for thread connections samples using a programmable digital rheometer device under influences of shear rate, temperature and different loading conditions. The experimental outcome shows a dramatical transformation of the tested five thread compound's viscosity and how their sealability performance is being compromised. In view of this, the tested samples showed that the reduced viscosity properties will impede the tubulars connection leak tightness and durability in most thermal well's development. Our results also revealed that particular samples do fail at low temperature condition (70 °C) as this may impinge on pipe connections behavior during the breakout operation.

中文翻译：

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螺纹化合物粘度降级对长期螺纹连接泄漏阻力的实验研究

摘要 油气泄漏是螺纹连接密封失效导致的（功能性）失效模式。为了在油气田的勘探和生产阶段实现更安全、更高效的操作，油田国家管材 (OCTG) 要求在安装过程中使用螺纹化合物（管道涂料）来润滑管子连接，提供高抵抗力磨损的存在并确定一致的摩擦系数，因此对于提高 API 标准连接的密封性能或其他期望非常重要。在热力强化油、高温流体（300℃左右）的改进和上调过程中，生产井的生产温度较低。为了表征 OCTG 螺纹连接的长期密封性能，本文介绍了实验比较研究，以及使用可编程数字流变仪装置在剪切速率的影响下，五种不同类型的螺纹化合物对螺纹连接样品的粘度降低的影响，温度和不同的负载条件。实验结果表明，所测试的五螺纹化合物的粘度发生了显着变化，以及它们的密封性能如何受到影响。有鉴于此，测试样品表明，在大多数热井的开发中，降低的粘度特性将阻碍管件连接的密封性和耐久性。