本发明公开了一种直连型套管螺纹接头，包括对称设置的母端和公端，所述母端和公端在螺纹两端分别设有台肩和密封面，螺纹起/退刀槽A设置在密封面与螺纹之间，且螺纹齿底高度低于所述密封面。台肩厚度分别满足h＝(25％～40％)T，公母端螺纹在拧接过程中，公母端内台肩先发生接触，产生一定的轴向过盈后，公母端外台肩开始发生接触。本发明的有益效果是：该直连型套管螺纹接头采用下潜式的设计加工方法，在满足h＝(25％～40％)T的要求时，其密封面处壁厚增加，能够提高密封性能的稳定性，同时能够提高管体的抗压缩性能。

The invention discloses a straight-connection-type casing pipe threaded connector which comprises a female end and a male end which are symmetrically arranged. Shoulders and sealing surfaces are arranged at the two ends of threads of the female end and the male end correspondingly, threaded tool pulling/withdrawal grooves A are formed between the sealing surfaces and the threads, and the bottoms of threaded teeth are lower than the sealing surfaces. The thicknesses of the shoulders meet h=(25%-40%)*T, in the screwing process of the threads of the male end and the female end, the inner shoulders of the male end and the female end make contact firstly, and after certain axial interference is generated, the outer shoulders of the male end and the female end make contact. The straight-connection-type casing pipe threaded connector has the beneficial effects that the straight-connection-type casing pipe threaded connector adopts a diving-type design and machining method, when the requirement that h=(25%-40%)*T is met, the wall thicknesses of the sealing surfaces of the straight-connection-type casing pipe threaded connector are increased, stability of the sealing property can be improved, and meanwhile the anti-compression property of a pipe body can be improved.