Spline Cardan Shaft Screw Drilling Tools

Abstract

The spline cardan shaft type screw drilling tool includes a cardan shaft; it is characterized in that: the cardan shaft includes a rotor joint, a transmission shaft joint, and a connecting shaft; the lower end of the rotor joint and the upper end of the transmission shaft joint are respectively arranged inside hole; two inner holes are equipped with short involute internal gear structures, and are respectively matched with the ring gear; the deformation coefficient of the external gear structure of the ring gear is smaller than that of the short involute internal gear structure; The top surface and the tooth root surface are arc-shaped curved surfaces bulging in the middle in the tooth width direction, and are parallel to each other; in the tooth width direction, the tooth thickness gradually decreases from the middle to both ends; the two ring gears pass through the two ends of the connecting shaft respectively. Standard involute spline connection, the two end surfaces of the connecting shaft are respectively threaded to connect the ball head, the ball head is matched with the concave spherical surface of the ball seat and is the same as the center of the ball, and the center of the ball is located on the axis of the ring gear; the two ball seats are fixedly installed In the inner hole of the rotor joint, the inner hole of the transmission shaft joint. The cardan shaft has the advantages of simple structure, long service life, convenient maintenance and a wide range of adaptation to angle changes.

Description

technical field [0001] The invention relates to the technical field of downhole dynamic drilling tools, in particular to a screw drilling tool. Background technique [0002] Screw drilling tool is a kind of downhole power drilling tool widely used in drilling engineering at present, and is widely used in drilling operations such as vertical wells, directional wells, horizontal wells, slave wells, workover, and various pipeline crossing constructions. The screw drilling tool is composed of four parts: bypass valve assembly, motor assembly, cardan shaft assembly and transmission shaft assembly. [0003] Since the motor rotor performs planetary motion in the stator, it is necessary to convert the planetary motion into the fixed axis rotation of the transmission shaft through the cardan shaft; when the screw drilling tool is used in a directional well, due to the need for deflection, the cardan shaft The housing has different angles of bend, so the cardan shaft also needs to co...

AI Technical Summary

Problems solved by technology

Due to its open structure, the petal seam wears quickly during use. When the gap increases to a certain range, the two petals are easily disengaged under the action of the torque and tension of the drilling tool, which will inevitably cause drilling accidents.

The petal cardan shaft is also washed by high-pressure mud during work, and its life is very short

Therefore, the current petal cardan shaft is no longer suitable for the current drilling needs

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