Motor Control System

Patent metadata

Field	Value
Publication number	US-2016195087-A1
Application number	US-201314653702-A
Country	US
Kind code	A1
Filing date	Dec 16, 2013
Priority date	Dec 19, 2012
Publication date	Jul 7, 2016
Grant date	—

Abstract

A technique facilitates control over the actuation of a device by utilizing a rotor and a corresponding stator system. The rotor is rotatably mounted in the stator system, and rotation of the rotor relative to the stator system is correlated with the volumetric displacement of the fluid passing between the rotor and the stator system. A control system is employed to control the angular displacement and/or torque of the rotor and/or the flow of fluid thereto.

First claim

What is claimed is:

1 . A system for controlling actuation, comprising:
a collar; a stator can rotatably mounted in the collar; a rotor rotatably mounted in the stator can, the rotation of the rotor relative to the stator can having a correlation with the volumetric displacement of fluid passing between the rotor and the stator can; and a control system which controls the relative rotation of the stator can with respect to the collar.

2 . (canceled)

3 . The system as recited in claim 1 , further comprising an actuatable component coupled to at least one of the rotor or the stator can.

4 . (canceled)

5 . The system as recited in claim 1 , further comprising:
a second stator can; and a second rotor coupled to the rotor.

6 . The system as recited in claim 1 , wherein the control system comprises a pressure actuated brake which selectively reduces slippage between the stator can and the collar.

7 . The system as recited in claim 1 , wherein the control system comprises an electrically actuated brake which selectively reduces slippage between the stator can and the collar.

8 . The system as recited in claim 1 , wherein the control system comprises a plurality of friction plates against which the stator can is moved to reduce slippage between the stator can and the collar.

9 . The system as recited in claim 1 , where the control system comprises a mud motor which selectively reduces slippage between the stator can and the collar.

10 . The system as recited in claim 1 , wherein the control system comprises a magneto-rheological fluid acting between the stator can and the collar.

11 . The system as recited in claim 1 , further comprising a plurality of sensors positioned to detect torque and angular velocity of at least one of the rotor and the stator can.

12 . (canceled)

13 . The system as recited in claim 1 , wherein the control system comprises an electromagnetic brake actuatable to selectively reduce slippage between the stator can and the collar.

14 . A system for controlling actuation, comprising:
a stator; a rotor rotatably mounted in the stator, the rotation of the rotor relative to the stator corresponding with the volumetric displacement of fluid passing between the rotor and the stator; a fluid bypass; and a flow control system coupled to the bypass to control the amount of fluid diverted through the bypass instead of flowing between the rotor and the stator.

15 . The system as recited in claim 14 , wherein the bypass extends through an interior of the rotor.

16 . The system as recited in claim 14 , wherein the bypass is oriented to direct fluid into a wellbore annulus.

17 . The system as recited in claim 14 , wherein the rotor and the stator are part of a drill string and the bypass is oriented to direct fluid back into the drill string.

18 . A method for providing control in a wellbore, comprising:
providing a rotor and a stator can with cooperating surfaces such that rotation of the rotor relative to the stator can depends on the volumetric displacement of fluid passing between the rotor and the stator can; rotatably mounting the stator can within a collar so the stator can may be allowed to rotate with respect to the collar during the volumetric displacement of fluid passing between the rotor and the stator can; and controlling the amount of slippage between the stator can and the collar to create a downhole actuation control system which controls the relative action between the rotor and the stator can.

19 . The method as recited in claim 18 , wherein controlling comprises controlling a bypass flow of the fluid past the rotor and the stator can.

20 . The method as recited in claim 18 , wherein controlling further comprises controlling at least one of the torque and the angular rotation of the rotor relative to the collar.

21 . (canceled)

22 . (canceled)

23 . The method as recited in claim 18 , further comprising utilizing a surface control system in combination with the downhole actuation control system.

24 . (canceled)

25 . (canceled)

26 . (canceled)

27 . (canceled)

28 . (canceled)

29 . (canceled)

30 . The method as recited in claim 18 , wherein controlling comprises at least one of: dampening a drill string vibration, orienting a component, agitating with a component, thrusting with a component, generating electricity, controlling loads on a drill component, powering a telemetry system, powering a pump, and powering a downhole component.

31 . The method as recited in claim 18 , wherein providing comprises providing a plurality of rotors and a plurality of stator cans to create a pair of progressing cavity motors; and operating the motors in opposite rotational directions.

Assignees

• Schlumberger Technology Corp

Inventors

• Downton Geoffrey C

Classifications

• F04C14/26

  using bypass channels · CPC title

• E21B4/02 Primary

  Fluid rotary type drives · CPC title

• F04C15/0084 Primary

  Brakes, braking assemblies · CPC title

• F04C13/008

  Pumps for submersible use, i.e. down-hole pumping · CPC title

• E21B43/129

  Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole (gas-lift E21B43/122; jet pumps E21B43/124) · CPC title