A Tool to Prevent Overtorque on Drill Bits

Abstract

The invention relates to a tool for preventing drill bit torque from being too high and belongs to the technical field of petroleum drilling tools. The tool comprises an upper joint, a disk spring, a conical sleeve, pushing pieces, a drive shaft and an output shaft, wherein the upper joint is arranged at the upper end of the drive shaft in a screw thread manner; the output shaft is sleeved on the lower end of the drive shaft; the conical sleeve is sleeved on the drive shaft; the disk spring is arranged between the conical sleeve and the upper joint; mounting holes are uniformly distributed in the circumference of the drive shaft; the pushing pieces are movably arranged in the mounting holes; one ends of the pushing pieces are in contact connection with the output shaft; and the other ends of the pushing pieces are in contact connection with the conical sleeve. In the working process of the tool, once the torque on the output shaft is too high, the pushing pieces leave from arc-shaped grooves of the output shaft, relative rotation can be produced between the pushing pieces and the output shaft and a drill bit at the lower part of the output shaft is avoided being braked, so that the damage of drill bit braking on a drilling assembly is avoided and the service life of the drilling assembly is prolonged; and the tool is particularly suitable for the installation and the application of the drilling tools.

Description

technical field

[0001] The invention relates to a tool for preventing excessive torque of a drill bit, belonging to the technical field of petroleum drilling tools. Background technique

[0002] With the rapid growth of global demand for oil resources, the depth of drilling and the complexity of strata are getting higher and higher, especially in some new shale gas exploration areas, oil and gas reservoirs are deeply buried, hard strata, strong abrasiveness and mechanical penetration rate Low, the formation exerts too much resistance torque on the PDC bit, which makes the PDC bit prone to frequent braking, which causes high-speed rotation and torsional vibration of the drill bit and drilling tools, resulting in bit chipping, damage, drill tool breakage, and downhole drilling. Damage to tools (such as rotary steerable systems and vertical drilling systems) and measurement-while-drilling instruments seriously affects drilling efficiency. Contents of the invention

[0003] T...

Examples

Embodiment Construction

[0019] The tool for preventing excessive torque of the drill bit includes an upper joint 1, a disc spring 3, a cone sleeve 2, a push piece 4, a transmission shaft 5 and an output shaft 7; There is output shaft 7. The transmission shaft 5 and the output shaft 7 are reducing bodies respectively, and a seal 6 is arranged between the transmission shaft 5 and the output shaft 7 to prevent impurities in the wellbore from entering the drilling fluid flow path from between the transmission shaft 5 and the output shaft 7 .

[0020] The transmission shaft 5 is covered with a tapered sleeve 2, and a disc spring 3 is arranged between the tapered sleeve 2 and the upper joint 1. Mounting holes are evenly distributed on the circumference of the upper end of the transmission shaft 5, and push pieces 4 are movable in the mounting holes. There are four mounting holes and four push pieces 4 respectively.

[0021] The push piece 4 is T-shaped; the output shaft 7 corresponding to the push piece 4...

technical field

[0001] The invention relates to a tool for preventing excessive torque of a drill bit, belonging to the technical field of petroleum drilling tools. Background technique

[0002] With the rapid growth of global demand for oil resources, the depth of drilling and the complexity of strata are getting higher and higher, especially in some new shale gas exploration areas, oil and gas reservoirs are deeply buried, hard strata, strong abrasiveness and mechanical penetration rate Low, the formation exerts too much resistance torque on the PDC bit, which makes the PDC bit prone to frequent braking, which causes high-speed rotation and torsional vibration of the drill bit and drilling tools, resulting in bit chipping, damage, drill tool breakage, and downhole drilling. Damage to tools (such as rotary steerable systems and vertical drilling systems) and measurement-while-drilling instruments seriously affects drilling efficiency. Contents of the invention

[0003] T...

Examples

Embodiment Construction

[0019] The tool for preventing excessive torque of the drill bit includes an upper joint 1, a disc spring 3, a cone sleeve 2, a push piece 4, a transmission shaft 5 and an output shaft 7; There is output shaft 7. The transmission shaft 5 and the output shaft 7 are reducing bodies respectively, and a seal 6 is arranged between the transmission shaft 5 and the output shaft 7 to prevent impurities in the wellbore from entering the drilling fluid flow path from between the transmission shaft 5 and the output shaft 7 .

[0020] The transmission shaft 5 is covered with a tapered sleeve 2, and a disc spring 3 is arranged between the tapered sleeve 2 and the upper joint 1. Mounting holes are evenly distributed on the circumference of the upper end of the transmission shaft 5, and push pieces 4 are movable in the mounting holes. There are four mounting holes and four push pieces 4 respectively.

[0021] The push piece 4 is T-shaped; the output shaft 7 corresponding to the push piece 4...

Images