DOWNHOLE TOOL USING A LOCKING CLUTCH

摘要

A downhole tool may be operated using a locking clutch. The downhole tool may include an upper downhole motor having a rotor. The downhole tool may also include a lower downhole motor having a shaft. Both the rotor and shaft may rotate relative to the housing. The locking clutch may be coupled to the rotor and the shaft, and may transmit a torque from the rotor to the shaft. The locking clutch may include at least one locking pawl configured to move from an engaged position to a disengaged position when the shaft rotates above a disengagement speed. In the engaged position, the upper downhole motor may provide a torque boost to limit sticking or stall of a drill bit coupled to the downhole tool.

主权项

1. A downhole tool, comprising:
a housing having an upper end portion configured to be coupled to a drill string; an upper downhole motor having a rotor configured to rotate relative to the housing; a lower downhole motor having a shaft, the shaft being rotatable relative to the housing, the shaft being configured to be coupled to a bit; and a locking clutch coupled to the rotor and the shaft, the locking clutch being configured to selectively transmit a torque from the rotor to the shaft, the locking clutch including:
at least one locking pawl configured to engage with an inner diameter of the rotor and an outer diameter of the shaft, the at least one locking pawl being biased into an engaged position, and the at least one locking pawl being configured to be in a disengaged position when the shaft rotates above a disengagement speed and in an engaged position when the shaft rotates below the disengagement speed.