Tread run-out 丝扣端面
Tread Form 丝扣形状
Diameters外径 2 3/8 ，2 7/8In.～ 8TPI Diameters外径 3 1/2 , 4 ,4 1/2In.～8TPI Diameters外径 ≥5In.～ ５TPI
Tape锥度１：１６
Tubing Seal Geometry 油管密封面简化结构
Diameters
外径≤4 1/2In.Casing Seal Geometry 套管管密封面简化结构
Di
Diameters 外径≥5In.
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STJ-SN Description 简介
STJ ‐SN 是多用途油管和套管接头，适用于中、深井和气井中的油管和套管，具有良好
的气密性。
STJ ‐SN IS THE MULTI ‐FUNCTION TUBING AND CASING CONNECTION ，IT HAS EXCELLENT GAS SEALED SUITABLE FOR MEDIUM AND DEEP WELL.
z STJ 金属对金属密封
STJ 锥度的反扭矩台阶使金属对金属密封强度加强。这一设计已在世界范围内几大油田使用中得 到验证。
z STJ ‐SN Metal to Metal Seal
The tapered STJ metal ‐to ‐metal al is energized by a rever angle torque shoulder ，a design that has been field proven in veral big oil fields the world over.
z STJ ‐SN 油管：30°密封，即使反复上卸扣也能保证极好的密封性。这种设计可以避免任何咬扣现
象。
z STJ Tubing ：a 30°angle al provides excellent gas tightness even after repeated make ‐ups breakouts.
The design virtually eliminates all risk of al galling.
z STJ-SN 套管：低锥度密封（10%锥度）使得在高拉伸（例如：套管串很重时）情况下保证气密封。 z STJ ‐SN Casing: a lower taper al (10% taper on diameter) provides gas tightness under high ‐tension
loads such as with heavy string weights.
z 反扭矩台阶
‐‐‐‐‐‐反扭矩台肩提供正扭矩止动。因此，上扣扭矩准确，同时减少接头的周向应力。 ‐‐‐‐‐‐反角的楔式效应使接头具有极佳的结构强度。 z Rever Angle Torque Shoulder
‐‐‐‐‐‐The rever angle torque shoulder provides a positive torque stop, which allows for accurate power tight make ‐up and minimizes hoop stress in the connection.
‐‐‐‐‐‐The wedge effect caud by the rever angle gives the connection a superior structural strength.
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z 改进的梯形扣设计
‐‐‐‐‐‐因为丝扣隐藏在接箍里（零尾扣），因此，接头可以达到最高的抗拉效率。
‐‐‐‐‐‐丝扣齿顶的间隙使得在最大程度上减少粘扣的可能性，防止丝扣油聚集在丝扣内部。 ‐‐‐‐‐‐螺纹结构简单，易对中，不会产生咬扣，上口快捷。 z Improved Buttress Thread
‐‐‐‐‐‐Becau the coupling covers the vanishing threads, the connection tensile efficiency is maximized. ‐‐‐‐‐‐Clearance at the top of the thread crests minimizes thread galling and avoids the trapping of compound inside the threads.
‐‐‐‐‐‐The design facilitates easy stabbing without cross ‐threading and fast trouble ‐free make ‐up.
z 接箍设计
‐‐‐‐‐‐STJ ‐SN 油管：加长接箍，配以最优化的外径，确保抗拉效率100%
‐‐‐‐‐‐STJ ‐SN 套管：接箍的外径与API 标准梯形相同。因此，可用API 方法和工具操作。 z Coupling Design
‐‐‐‐‐‐STJ ‐SN Tubing: Lengthened coupling ，Matching the suitable tube ，Ensure a 100% structural strength ‐‐‐‐‐‐STJ ‐SN Casing ：Same outside diameter with API buttress thread form ，thus API gauge can be ud.
z 流线形内孔设计
‐‐‐‐‐‐STJ ‐SN 油管： 6°内孔导角，接箍中心公差严格，加之长台肩。因此，在流体高速流动时可以 减少接箍内孔的涡流现象及能量损失。
----STJ-SN 套管：15°内孔导角和加长台肩。因此，起下完井工具不会损毁接头，而使用普通接头 则常常发生问题。
z Streamline Design In Inner Hole
‐‐‐‐‐‐STJ ‐SN Tubing ：6°angle inner hole with strict concentric tolerance on coupling ，with long shoulder ， thus it will reduce energy loss and vortex phenomena.
‐‐‐‐‐‐STJ ‐SN Casing: 15°angle inner hole with lengthened shoulder, thus the connection will not be destructed when work over completion tool. But common connection always be damaged
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