Dual flexible shaft apparatus for improved downhole operations
AssigneeSchlumberger Technology Corporation
InventorsIdalia Ovalle Stevenson, Rishi Mishra, Dan Tabalan
Life of this patent
Estimating the term…
Abstract
Systems and a tool are disclosed herein for improved debris collection within a wellbore. An example debris collection tool can include a motor rotationally coupled to a pump by a first flexible shaft, the pump rotationally coupled to a gearbox by a second flexible shaft, and the gear box rotationally coupled to a milling bit by an additional shaft. The flexible shafts can be made of a flexible, but durable material that can absorb strain created by a pump whose rotor rotates eccentrically with the axis of rotation offset from the axis of symmetry. The flexible shafts can be made of a durable and flexible material that can withstand the strain created by the eccentric rotation.
Claims20
A debris collection tool for debris collection within a wellbore, comprising:
- a motor rotationally coupled to a first end of a pump by a first flexible shaft;
- a gearbox rotationally coupled to a second end of the pump by a second flexible shaft, wherein the gearbox is configured to modify rotational speed and torque generated by the motor;
- and
- a milling bit rotationally coupled to the gearbox by an additional shaft,
- wherein the first and second flexible shafts are separate from the motor, the pump, and the gearbox,
- wherein the first and second flexible shafts each comprise a first end portion, a second end portion, and a shaft portion extending between the first and second end portions, and
- wherein the first and second end portions of the first and second flexible shafts each comprise a diameter greater than a shaft diameter of the shaft portion.
A debris collection tool for debris collection within a wellbore, comprising:
- a motor rotationally coupled to a first end of a pump by a first flexible shaft;
- and
- a milling bit rotationally coupled to the pump by a second flexible shaft, wherein the second flexible shaft passes through a bailer positioned between the pump and the milling bit without a gearbox positioned between the pump and the milling bit.
Dependencies are inferred from the claim text.