Subsea casing drilling system

Patent metadata

Field	Value
Publication number	US-2017051561-A1
Application number	US-201615346544-A
Country	US
Kind code	A1
Filing date	Nov 8, 2016
Priority date	Feb 22, 2012
Publication date	Feb 23, 2017
Grant date	—

Abstract

A casing drilling system includes a casing having a bore therethrough; a drilling member coupled to the casing; a retrievable motor releasably coupled to the casing and includes a power section configured to rotate the drilling member relative to the casing; and a cementing tube in selectively fluid communication with the bore of the casing for diverting cement from the power section of the drilling motor.

First claim

1 . A casing drilling system, comprising:
a casing; a drilling member coupled to the casing; a retrievable motor releasably coupled to the casing and includes a power section configured to rotate the drilling member relative to the casing; and a cement diverter for diverting cement from the power section of the drilling motor, the cement diverter having:
a diverter sub coupled to the motor,
a cementing tube in selectively fluid communication with a bore of the diverter sub, and
a sleeve disposed in the bore, wherein the sleeve is selectively actuatable to open fluid communication to the cementing tube.

2 . The system of claim 1 , wherein the motor includes a rotating portion and non-rotating housing, wherein the power section comprises an annular area between the rotating portion and a non-rotating portion.

3 . The system of claim 2 , further comprising a coupling for transferring load between the non-rotating housing and the casing.

4 . The system of claim 2 , further comprising a bearing for transmitting load from an output connected to the rotating portion to the non-rotating housing.

5 . The system of claim 2 , wherein the motor includes an arcuate recess formed in non-rotating housing, wherein a ball received at an end of the arcuate recess prevents relative rotation between the rotating portion and the non-rotating housing.

6 . The system of claim 1 , further comprising a locking mechanism to prevent relative rotation between drilling member and the casing.

7 . The system of claim 6 , wherein the locking mechanism includes:
a locking segment attached to the casing; a first set of teeth formed on the locking segment; and a second set of teeth formed on the drilling member, wherein the second set of teeth is engageable with the first set of teeth to prevent relative rotation between the casing and the drilling member.

8 . The system of claim 6 , wherein the locking mechanism includes an arcuate recess formed between the casing and the drilling member, a ball received at an end of the arcuate recess prevents relative rotation between casing and the drilling member.

9 . The system of claim 6 , wherein the locking mechanism includes:
an upper sleeve attached to the casing, the upper sleeve having a first set of teeth; and a lower sleeve releasably coupled the motor, the lower sleeve having a second set of teeth configured to mate with the first set of teeth, wherein upon release, the lower sleeve is movable to engage the upper sleeve, thereby preventing relative rotation between casing and the drilling member.

10 . The system of claim 1 , wherein the cementing tube is in fluid communication with an exterior of the casing.

11 . The system of claim 1 , further comprising a releasable coupling assembly for coupling an output shaft of the motor to the drilling member.

12 . The system of claim 11 , wherein the releasable coupling assembly includes a first thread connecting a coupling to the drilling member and a second thread for connecting the coupling to the output shaft, wherein the second thread is configured to shear at a lower force than the first thread.

13 . The system of claim 11 , wherein the releasable coupling assembly includes:
a drillable coupling attached to the drilling member; and a retractable dog configured to couple or decouple the output shaft to the drillable coupling.

14 . The system of claim 1 , further comprising a releasable coupling assembly for coupling the motor to the casing.

15 . A method of forming a wellbore in a formation, comprising:
providing a casing with a motor for rotating a drilling member relative to the casing; rotating the drilling member to extend the wellbore; supplying cement around the motor via a cementing tube and into the wellbore; detaching the motor from the drilling member; and retrieving the motor.

16 . The method of claim 15 , wherein the motor is coupled to a non-rotating portion of the casing and to a rotating portion of the drilling member.

17 . The method of claim 15 , wherein the motor is releasably coupled to the casing using a shearable threaded connection.

18 . The method of claim 15 , wherein the motor includes a rotatable member and a stationary member, and further comprising preventing the rotatable member from rotation.

19 . The method of claim 18 , wherein prevention rotation of the rotatable member comprises landing a ball in a recess between the rotatable member and the stationary member.

20 . A casing drilling system, comprising:
a casing having a bore therethrough; a drilling member coupled to the casing; a retrievable motor releasably coupled to the casing and includes a power section configured to rotate the drilling member relative to the casing; and a cementing tube in selectively fluid communication with the bore of the casing for diverting cement from the power section of the drilling motor.

21 . The system of claim 20 , wherein the cementing tube is in fluid communication with an exterior of the casing.

Assignees

• Weatherford Tech Holdings Llc

Inventors

• Twardowski Eric M
• Odell Ii Albert C
• Trevino Jose A

Classifications

• E21B4/02

  Fluid rotary type drives · CPC title

• E21B7/208 Primary

  using down-hole drives (E21B7/203 and E21B7/206 take precedence) · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title

• E21B2034/005

  Fixed Constructions · mapped topic

• E21B4/00

  Drives for drilling, used in the borehole · CPC title