Motion compensation system

Patent metadata

Field	Value
Publication number	US-9784051-B2
Application number	US-201314114957-A
Country	US
Kind code	B2
Filing date	Oct 30, 2013
Priority date	Jul 3, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A motion compensation system disposed on a structure of a drilling vessel. A stabilization assembly for use with the motion compensation system includes a first arm connectable to the structure, a first sheave connectable to the structure, a second arm connectable to the first arm, and a second sheave connectable to the second arm. At least one of the first arm and the first sheave are connectable to the structure at different locations and the first arm and the second sheave are connectable to the second arm at different locations.

First claim

What is claimed is:

1. A stabilization assembly for use within a motion compensation system disposed on a structure of a drilling vessel, comprising:
a first arm directly connectable to the structure;
a second arm connectable to the first arm;
a first sheave connectable to the second arm;
a second sheave connectable to the second arm; and
wherein the first arm, the first sheave, and the second sheave are each rotatably connected about an axis to the second arm, with each axis of the first arm, the first sheave, and the second sheave offset from and fixed with respect to each other.

2. The stabilization assembly of claim 1 , wherein the first arm comprises a first end and a second end, the first end is connectable to the structure, and the second end is connectable to the second arm.

3. The stabilization assembly of claim 1 , further comprising a third sheave connectable to the structure.

4. The stabilization assembly of claim 1 , wherein the second arm comprises a first end and a second end, the first end is connectable to the first sheave, and the second end is connectable to the second sheave.

5. The stabilization assembly of claim 1 , wherein the first arm is connectable to the second arm between the first sheave and the second sheave.

6. The stabilization assembly of claim 1 , wherein the first arm is rotatably connectable to the structure.

7. A stabilization assembly for use within a motion compensation system disposed on a structure of a drilling vessel, comprising:
a first arm connectable to the structure;
a second arm connectable to the first area;
a first sheave connectable to the second arm;
a second sheave connectable to the second arm;
a third arm connectable to the structure;
a fourth arm connectable to the third arm;
a third sheave connectable to the fourth arm;
a fourth sheave connectable to the fourth arm;
wherein the first arm, the first sheave, and the second sheave are each rotatably connected about an axis to the second arm, with each axis of the first arm, the first sheave, and the second sheave offset from and fixed with respect to each other; and
wherein the third arm, the third sheave, and the fourth sheave are each rotatably connected about an axis to the fourth arm, with each axis of the third arm, the third sheave, and the fourth sheave offset from and fixed with respect to each other.

8. The stabilization assembly of claim 3 , wherein the first arm and the third sheave are rotatably connectable to the structure about different axes.

9. The stabilization assembly of claim 1 , wherein the second arm is movable between an upper position and a lower position with respect to the first arm, and a cable is engageable with and extendable between the first sheave and the second sheave.

10. A motion compensation system disposed on a structure of a drilling vessel, the system comprising:
a crown block;
a stabilization assembly connectable between the crown block and the structure, the stabilization assembly comprising:
a first arm directly connectable to the structure;
a second arm connectable to the first arm;
a first sheave connectable to the second arm;
a second sheave connectable to the second arm; and
wherein the first arm, the first sheave, and the second sheave are each rotatably connected about an axis to the second arm, with each axis of the first arm, the first sheave, and the second sheave offset from and fixed with respect to each other;

a cable extendable from the crown block and between the first sheave and the second sheave; and
wherein the stabilization assembly is movable with the crown block between an upper position and a lower position with respect to the structure.

11. The system of claim 10 , wherein the structure comprises a derrick, and the first arm is connectable to a deck of the derrick.

12. The system of claim 10 , wherein the first arm comprises a first end and a second end, the first end is connectable to the structure, and the second end is connectable to the second arm.

13. The system of claim 10 , wherein the stabilization assembly further comprises:
a third sheave connectable to the structure.

14. The system of claim 13 , wherein the second arm comprises a first end and a second end, the first end is connectable to the first sheave, and the second end is connectable to the second sheave.

15. The system of claim 13 , wherein the first arm is connectable to the second arm between the first sheave and the second sheave.

16. The system of claim 10 , wherein the first arm is rotatably connectable to the structure.

17. The system of claim 10 , wherein the stabilization assembly further comprises:
a third arm connectable to the structure;
a fourth arm connectable to the third arm;
a third sheave connectable to the fourth arm; and
a fourth sheave connectable to the fourth arm;
wherein the third arm, the third sheave, and the fourth sheave are each rotatably connected about an axis to the fourth arm, with each axis of the third arm, the third sheave, and the fourth sheave offset from and fixed with respect to each other; and
wherein the cable is extendable from the crown block and between the third sheave and the fourth sheave.

18. The system of claim 13 , wherein the first arm and the third sheave are rotatably connectable to the structure about different axes.

Assignees

• Cameron Int Corp

Inventors

• Bergan Håkon

Classifications

• B63B35/4413

  Floating drilling platforms, e.g. carrying water-oil separating devices · CPC title

• B63B39/00 Primary

  Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude {(for amphibious vehicles B60F3/0038)} · CPC title

• B66C13/02

  Devices for facilitating retrieval of floating objects, e.g. for recovering crafts from water (handling live-boats B63B; salvaging, or hauling-out on slipways, waterborne vessels B63C; winding mechanism controls B66D1/52) · CPC title

• E21B19/006 Primary

  including heave compensators · CPC title

• E21B19/09 Primary

  specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string · CPC title