Long fiber thermoplastic composite (LFT) has been mainly used in conventional applications such as automotive because of its low cost, great specific mechanical properties, excellent impact performance, excellent corrosion resistance and ease of processibility. All of these great properties enable it a potential material candidate in unconventional applications such as offshore gas and oil drilling. This work focuses on the design optimization, prototyping, and testing of a long glass fiber reinforced polyamide 66 (glass/PA66) stop collar for stabilizing buoyancy modules on a drill pipe for offshore gas and oil drilling application. Solid model is created using CREO and structural models are constructed using ANSYS Workbench with proper boundary and loading conditions. The material properties obtained from previous material studies are used for the modeling input and geometry design is optimized to achieve the required safety factor. The glass/PA66 stop collar is then prototyped using extrusion compression molding process. The performance of the LFT stop collars is finally validated with a slip testing and a successful practical run in a drilling operation.

长纤维热塑性复合材料（LFT）由于其低成本，出色的特定机械性能，出色的抗冲击性能，出色的耐腐蚀性和易加工性，已主要用于诸如汽车的常规应用中。所有这些出色的性能使其成为非常规应用（例如海上天然气和石油钻探）中潜在的材料候选者。这项工作专注于长玻璃纤维增​​强聚酰胺66（glass / PA66）挡圈的设计优化，原型设计和测试，以稳定钻杆上的浮力模块，以用于海上天然气和石油钻井应用。使用CREO创建实体模型，并使用具有适当边界和加载条件的ANSYS Workbench构建结构模型。从先前的材料研究中获得的材料属性用于建模输入，并且对几何设计进行了优化以实现所需的安全系数。然后使用挤出压缩成型工艺对玻璃/ PA66挡圈进行原型制作。LFT挡圈的性能最终通过打滑测试和在钻井作业中成功的实际运行进行了验证。