초록 ▼

A preset torque limiter sub having a pin member and a box member. The pin member is connected to a section of drill pipe and has a male connection at one end. The box member is connected to a second section of drill pipe. The male connection and the female connection are connected together. Whenever

A preset torque limiter sub having a pin member and a box member. The pin member is connected to a section of drill pipe and has a male connection at one end. The box member is connected to a second section of drill pipe. The male connection and the female connection are connected together. Whenever the torque on the sub exceeds a selected amount, the pin member and the box member can rotate with respect to one another. However, whenever the torque on the sub is below the selected amount, the pin member and the box member are held rigidly together.

대표청구항 ▼

A torque limiter sub, comprising: a box member having a female connection at one end and a makeup shoulder; a pin member having a male member at one end and a makeup shoulder which contacts the makeup shoulder in the box member; a selected one of the female connection and the male connection having

A torque limiter sub, comprising: a box member having a female connection at one end and a makeup shoulder; a pin member having a male member at one end and a makeup shoulder which contacts the makeup shoulder in the box member; a selected one of the female connection and the male connection having threads and the other connection having concentric grooves; a split ring insert, located between the female connection and the male connection, said insert having threads and concentric grooves to mate and mesh with said selected ones of said threads and grooves on the female connection and the male connection to hold the female connection and the male connection against rotation with respect to one another whenever the torque on the sub is below a selected amount, but to allow the female connection and the male connection to rotate with respect to one another, without separating axially, whenever the torque on the sub exceeds the selected amount; and retention means for holding the insert against rotational movement along the concentric grooves during makeup of the torque limiter sub.