Tool connection release system

• US 9,834,997 B2
• Filed: 02/24/2015
• Issued: 12/05/2017
• Est. Priority Date: 02/24/2015
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Onesubsea IP UK Limited (Schlumberger NV)
• Inventors: Nicholson, Joseph Allan
• Primary Examiner(s): Gay, Jennifer H
• Application Number:
  US14/630,338
• Publication Number:
  US 20160245024A1
• Time in Patent Office: 1,015 Days
• CPC Class Codes: E21B 17/06 Releasing-joints, e.g. safety joints

Abstract

A connection release system for the disconnection of various connections, such as electrical, hydraulic, optical, and/or multi-connector, to a service tool in a high pressure environment. An embodiment of the connection release system includes a first and second housing portion with a piston disposed partially within both the first and second housing portions, the piston having a plurality of threads at an exterior portion of a second end. The system further includes a plurality of fluid chambers disposed in the first housing portion, the fluid chambers are filled with fluid to pressure-balance the piston such that the addition of a pressurized fluid to the pressure-balanced piston causes the piston to move, the exterior threaded portion of the piston to disengage an interior threaded portion within the housing second portion, and allow the first housing portion to separate from the second housing portion.

Claims

1. A tool connection release system, the system comprising:

a housing having a first portion and a second portion;

a piston disposed at least partially within the housing first portion and at least partially within the housing second portion;

a first fluid chamber including a first pressurized fluid acting against the piston;

a fluid source coupled to the first fluid chamber;

a sealed opening configured to rupture and open under a predetermined pressure; and

a second fluid chamber, in fluid communication with the sealed opening, including a second pressurized fluid acting against the piston to oppose the first pressurized fluid and pressure-balance the piston;

wherein addition of a fluid from the fluid source to the first fluid chamber causes the piston to move and the first housing portion to separate from the second housing portion.

2. The system of claim 1, further comprising a piston shoulder separating the first and second fluid chambers, and wherein the first pressurized fluid in the first fluid chamber acts on the piston shoulder in a first direction, and the second pressurized fluid in the second fluid chamber acts on the piston shoulder in a second direction opposite the first direction.

3. The system of claim 2, wherein the addition of the pressurized fluid to the first fluid chamber ruptures the sealed opening allowing the fluid to communicate with at least one of a plurality of buffer chambers.

4. The system of claim 3, wherein the fluid flows past the ruptured sealed opening to the plurality of buffer chambers.

5. The system of claim 4, wherein the buffer chambers are configured to receive an amount of the fluid equivalent to a displacement volume of the fluid from a stroke of the piston through an actuation length.

6. The system of claim 5, wherein the first housing portion and the second housing portion are separated by manually pulling on one of the first or second housing portions.

7. A tool connection release system, the system comprising:

a housing having a first portion and a second portion, the first portion being coupled to a cable;

a piston having a first end axially disposed at least partially within the housing first portion, and a plurality of threads at a second end;

a first fluid chamber including a first pressurized fluid acting against the piston;

a fluid source coupled to the first fluid chamber;

a sealed opening configured to rupture and open under a predetermined pressure; and

a second fluid chamber, in fluid communication with the sealed opening, including a second pressurized fluid acting against the piston to oppose the first pressurized fluid and pressure-balance the piston; and

a release nut disposed within the housing second portion and having a plurality of threads at an interior portion of a first end, a recess at an exterior portion of the first end, a second end, and a plurality of circumferentially disposed slots that pass through the plurality of threads and the recess in the first end, the second end being attached to a portion of the housing second end;

wherein the threaded exterior portion of the piston is configured to releasably engage the threaded interior portion of the release nut and the plurality of circumferentially disposed slots is configured to allow the release nut first end to move radially outward and disengage the threaded exterior portion of the piston from the threaded interior portion of the release nut such that the piston and the housing first portion are separable from the release nut and the housing second portion.

8. The tool connection release system of claim 7, wherein a plurality of cavities are formed between the housing first and second portions and the piston, and between the housing second portion and the release nut, the plurality of cavities being in fluid communication with one another.

9. The tool connection release system of claim 8, the housing first portion further comprises at least one bore having a burst disc disposed therein.

10. The tool connection release system of claim 9, wherein the plurality of cavities is filled with fluid, providing a sealed environment for the piston and the release nut.

11. The tool connection release system of claim 10, the housing first portion further comprising:

a first fluid chamber disposed in the first housing portion, connected to a fluid source, and in fluid communication with a first portion of the piston; and

a second fluid chamber disposed in the first housing portion and in fluid communication with a second portion of the piston;

wherein the first and second fluid chambers are separated by the piston and configured to receive fluid;

wherein when the first fluid chamber and second fluid chamber are filled with fluid, the fluid in the first fluid chamber acts on the piston in a first direction and the fluid in the second chamber acts on the piston in a second direction opposite the first direction to pressure-balance the piston.

12. The tool connection release system of claim 11, wherein additional fluid is added to the fluid-filled first fluid chamber to displace the fluid and move the piston, such that fluid flows to the burst disc, actuates the burst disc, and flows into a gallery beyond the burst disc;

the movement of the piston thereby causing the threaded exterior portion of the piston to disengage the threaded interior portion of the release nut.

13. The tool connection release system of claim 12, wherein a hydraulic signature is created as each thread of the threaded exterior portion of the piston disengages each thread of the threaded interior portion of the release nut.

14. The tool connection release system of claim 13, further comprising a biasing element disposed in the recess at the exterior portion of the release nut first end.

15. The tool connection release system of claim 14, wherein a force exerted to separate the piston and the housing first portion from the release nut and the housing second portion overcomes the biasing element.

16. The tool connection release system of claim 15, wherein the force exerted to overcome the biasing element is supplied by the additional fluid.

17. The tool connection release system of claim 15, wherein the force exerted to overcome the biasing element is supplied by an external force exerted on the cable and transmitted to the housing first portion and the piston.

18. A tool connection release system, the system comprising:

a plug connector having a first end and a second end, the first end coupled to a cable, and an outer portion of the second end having at least one axial protrusion;

an actuation cylinder housing having a first end, a second end, and a plurality of circumferentially spaced galleries, the first end coupled to the plug connector;

a piston having a first end, a second end, and a plurality of threads at an exterior portion of the second end, the piston being axially disposed at least partially within the activation cylinder housing and forming a first cavity therein;

a piston cap is disposed around the piston and forms a second cavity therein, threadably engages the second end of the actuation cylinder, and is configured to retain the first end of the piston within the actuation cylinder;

a motor head having a first end and a second end, an inner portion of the first end having at least one axial recess configured to engage the protrusion on the outer portion of the plug connector second end;

a release nut having a plurality of threads at an interior portion of a first end, a recess at an exterior portion of the first end, a second end, and a biasing member disposed in the recess; and

a protection sleeve disposed about the release nut and a portion of the piston cap, the sleeve forming a third cavity with the release nut;

wherein the piston is configured to axially slide around an outer portion of the motor head;

wherein the plurality of threads on the exterior portion of the piston second end is configured to releasably engage the threads on the interior portion of the release nut first end upon addition of a pressurized fluid.

19. The system of claim 18, wherein the first, second, and third cavities are filled with fluid and pressure-balanced.

20. The system of claim 19, wherein the addition of the pressurized fluid ruptures a burst disc allowing fluid to communicate with the plurality of galleries.

21. The system of claim 20, wherein the housing first end and the housing second end are separated by manually pulling on one of the first or second housing ends.