Apparatus and method for connecting tubulars of a wellsite

Patent metadata

Field	Value
Publication number	US-9506304-B2
Application number	US-201314025507-A
Country	US
Kind code	B2
Filing date	Sep 12, 2013
Priority date	Sep 12, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A rotational driver for driving a connector through adjacent tubulars is provided. The adjacent tubulars are positionable in a wellbore of a wellsite for passing fluid therethrough. The rotational driver includes a gearbox housing positionable about the connector, a socket carried by the gearbox housing to receivingly engage the connector, and a plurality of gears driven by at least one motor. The gears are operatively connectable to the socket to transfer torque from the motor thereto, and have interlocking teeth defining a plurality of contacts therebetween whereby load on the gears is distributable therebetween.

First claim

What is claimed is:

1. A rotational driver for driving a connector through adjacent tubulars, the adjacent tubulars positionable in a wellbore of a wellsite for passing fluid therethrough, the rotational driver comprising:
a gearbox housing positionable about the connector;
a socket carried by the gearbox housing to receivingly engage the connector; and
a plurality of gears driven by at least one motor, the plurality of gears operatively connectable to the socket to transfer torque from the at least one motor thereto, the plurality of gears having interlocking teeth defining a plurality of contacts therebewteen whereby load on the plurality of gears is distributable therebetween.

2. The rotational driver of claim 1 , wherein the plurality of gears comprises:
a plurality of pinion gears operatively connectable to a plurality of motors and rotationally driven thereby;
a drive gear operatively connectable to the plurality of pinions and rotationally driven thereby;
a plurality of intermediate gears operatively connectable to the drive gear and rotationally driven thereby; and
a socket gear operatively connectable to the plurality of intermediate gears and rotationally driven thereby, the plurality of intermediate gears having a plurality of teeth in constant engagement with the socket gear whereby torque is distributed between the intermediate gears during rotation thereof with the socket gear.

3. The rotational driver of claim 2 , wherein the plurality of gears comprise a plurality of intermediate gears having interlocking teeth defining a plurality of contacts between the intermediate gears and the socket.

4. The rotational driver of claim 2 , wherein the plurality of pinion gears have teeth engageable with the drive gear.

5. The rotational driver of claim 2 , wherein the drive gear has a drive shaft, the drive shaft having splines engageable with the plurality of intermediate gears.

6. The rotational driver of claim 2 , wherein the plurality of pinion gears comprise two pinion gears, each of the two pinion gears having teeth engageable with the socket gear.

7. The rotational driver of claim 2 , wherein the socket gear has an aperture therethrough, a drive end of the socket receivable in the aperture.

8. The rotational driver of claim 1 , wherein the at least one motor comprises a pair of hydraulic motors and the plurality of gears comprises a pair of pinions, each of the pair of pinions operatively connectable to one of the pair of hydraulic motors.

9. The rotational driver of claim 1 , wherein the at least one motor comprises a pair of motors, a first of the pair of motors having a first rotational setting and a second of the pair of motors having a second rotational setting, the second rotational setting being greater than the first rotational setting.

10. The rotational driver of claim 1 , further comprising a retainer operatively connectable to the gearbox housing and engageable with the connector whereby the connector is retainable in the socket during the advancing.

11. The rotational driver of claim 10 , wherein the retainer comprises a pivotal retainer bracket, a cylinder, a piston, and a wedge.

12. The rotational driver of claim 11 , wherein the retainer bracket is operatively connectable to the gearbox housing, the cylinder is operatively connectable to the gearbox housing by the bracket, the piston is extendable from the cylinder by the pivotal retainer bracket, and the wedge engageable with the connector.

13. The rotational driver of claim 11 , wherein the gearbox housing is operatively connectable to an axial driver.

14. A drive assembly for connecting adjacent tubulars with connectors, the adjacent tubulars positionable in a wellbore of a wellsite for passing fluid therethrough, the drive assembly comprising:
an axial rail operatively connectable to a carrier and positionable thereby;
a cylinder positioned on the base, the cylinder having a piston extendable therefrom;
a bracket operatively connectable to an end of the piston and slidably positionable along the axial rail;
a rotational driver carried by the bracket, the rotational driver comprising:
a gearbox housing positionable about the connector;
a socket carried by the gearbox housing to receivingly engage the connector; and
a plurality of gears driven by at least one motor, the plurality of gears operatively connectable to the socket to transfer torque from the at least one motor thereto, the plurality of gears having interlocking teeth defining a plurality of contacts therebewteen whereby load on the plurality of gears is distributable therebetween; and
a socket having a receptacle to receivingly engage the connector, the socket operatively connectable to a socket gear and driven thereby.

15. The drive assembly of claim 14 , wherein the carrier comprises a frame and a plurality of rails.

16. The drive assembly of claim 14 , wherein the carrier comprises a bracket, a rolling frame, and a crane.

17. The drive assembly of claim 14 , further comprising a clam assembly carried by the carrier, the axial rail operatively connectable to the clam assembly.

18. A method of connecting adjacent tubulars positionable in a wellbore of a wellsite for passing fluid therethrough, the method comprising:
positioning a rotational driver about the tubulars, the rotational driver comprising:
a gearbox housing positionable about the connector;
a socket carried by the gearbox housing to receivingly engage the connector; and
a plurality of gears driven by at least one motor, the plurality of gears operatively connectable to the socket to transfer torque from the at least one motor thereto, the plurality of gears having interlocking teeth defining a plurality of contacts therebewteen;

engaging the connector with the socket; and
driving the connector through the adjacent tubulars by rotating the connector with the rotational driver and axially moving the rotational driver.

19. The method of claim 18 , further comprising selectively applying torque to the connector by rotating the plurality of gears with a first motor and applying additional torque to the connector by rotating the plurality of gears with a second motor.

20. The method of claim 18 , further comprising distributing load between the plurality of gears by engaging the plurality of gears along the plurality of contacts with the socket.

21. The method of claim 18 , wherein the driving further comprises transferring torque from the at least one motor to the socket with the plurality of gears.

22. A rotational driver for driving a connector through adjacent tubulars, the adjacent tubulars positionable in a wellbore of a wellsite for passing fluid therethrough, the rotational driver comprising:
a ratchet support positionable about the adjacent tubulars;
a pawl housing slidably positionable along the ratchet support by an actuator piston;
a socket carried by the pawl housing to receivingly engage the connector, the socket rotationally driven by a motor; and
a pawl selectively extendable from the pawl housing by a pawl piston to engage the socket whereby the connector is rotatable.

23. The rotational driver of claim 22 , further comprising a ratchet lift operatively connectable to the ratchet support.

24. The rotational driver of claim 23 , wherein the ratchet lift comprises a cylinder with a piston extendable therefrom, the piston having a piston end operatively connectable to the ratchet support.

Assignees

• Nat Oilwell Varco Lp

Inventors

• Jahnke Douglas Aaron

Classifications

• B25B21/002

  for special purposes · CPC title

• B25B21/004

  of the ratchet type · CPC title

• E21B19/16 Primary

  Connecting or disconnecting pipe couplings or joints (E21B19/20 takes precedence) · CPC title

• E21B19/002

  specially adapted for underwater drilling (E21B19/09, E21B19/143 take precedence) · CPC title

• E21B17/085

  Riser connections (connectors for wellhead E21B33/038) · CPC title