tubing coupling

Influence of Coupling Copperizing on Anti galling Performance of Tubing Threads

接箍镀铜对油管抗粘扣性能的影响

Oil-sucker rod coupling and oil tubing constitute sliding friction pair in the work state in the oil wells, meanwhile withstands corrosion and alternate load, which cause wear, corrosion and fatigue failure.

油田机采井抽油杆接箍与油管在工作状态下构成滑动摩擦副，同时还承受介质腐蚀和交变载荷，产生磨损、腐蚀和疲劳断裂失效。

Relevant process testing showed that when threading the non-coupled end of a coupled tubing, thread quality was negatively affected little by the coupling, and that all the items inspected, namely taper, pitch, tooth height, standoff and L4 were within the specific tolerances.

工艺试验表明，带接箍油管另一端加工螺纹时，其接箍对螺纹质量基本无影响，其检验项目锥度、螺距、齿高、紧密距、L4长度均在公差允许范围内。

The distance between the main tong and the back tong is short, and this causes excessive clamping force on the tubing coupling.

国产液压钳主钳和背钳的间隔距离短，背钳夹持接箍时，因夹持力过大造成接箍变形引起粘扣。另外，油管对中性差也易造成错扣而粘扣。