Disconnect device

Abstract

A disconnect device for use as part of a downhole assembly in an oil or gas well. In one embodiment, the device comprises a lower receptacle assembly comprising a recess profile; an upper assembly comprising: a shaft comprising a fluid passage, a collet comprising collet fingers, a piston, a cylinder assembly, a pressure chamber disposed radially between the shaft and the cylinder assembly, and a spring, wherein the piston is selectively movable into three positions.

Claims

1. A disconnect device for use as part of a downhole assembly in an oil or gas well which comprises: a lower receptacle assembly comprising a recess profile; an upper assembly comprising: a shaft comprising a fluid passage, a collet comprising collet fingers, a piston, a cylinder assembly, a pressure chamber disposed radially between the shaft and the cylinder assembly, and a spring wherein the piston is selectively movable into three positions, wherein the three positions comprise a first position, comprising the piston disposed radially between the shaft and the collet fingers, and wherein the piston is coupled to the cylinder assembly via at least one shear pin.

2. A method for disconnecting a disconnect device for use as part of a downhole assembly in an oil or gas well comprising: (A) outfitting a downhole assembly with a disconnect device comprising: a lower receptacle assembly comprising a recess profile; and an upper assembly comprising: a shaft comprising a fluid passage, a collet comprising collet fingers, a piston, a cylinder assembly, a pressure chamber disposed radially between the shaft and the cylinder assembly, and a spring, wherein the piston is disposed radially between the shaft and the collet such that the collet fingers are engaged with the recess profile, and wherein the piston is coupled to the cylinder assembly via at least one shear pin; (B) applying an actuating pressure within the fluid passage and the pressure chamber to a pressure level capable of shearing the at least on shear pin to free the piston for displacement; (C) lowering the pressure level in the pressure chamber by releasing pressure; (D) allowing the piston to be displace to a position radially between the shaft and the cylinder assembly, wherein the collet fingers are not engaged with the recess profile; and (E) disconnecting the lower receptacle assembly from the upper assembly.

3. The method of claim 2 further comprising reconnecting the lower receptacle assembly and the upper assembly.

4. The method of claim 3, wherein reconnecting the lower receptacle assembly and the upper assembly comprises stabbing the upper assembly into the lower receptacle assembly and applying pressure into pressure chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) For a detailed description of the preferred embodiments of the invention, reference will now be made to the accompanying drawings in which:

(2) FIG. 1 illustrates a longitudinal, cross-sectional view of a disconnect device according to an embodiment of the present invention in an initial coupled state;

(3) FIG. 2 illustrates a longitudinal, cross-sectional view of a disconnect device according to an embodiment of the present invention in a pressure-actuated state;

(4) FIG. 3 illustrates a longitudinal, cross-sectional view of a disconnect device according to an embodiment of the present invention in a pressure-released state;

(5) FIG. 4 illustrates a longitudinal, cross-sectional view of a lower receptacle assembly of a disconnect device according to an embodiment of the present invention; and

(6) FIG. 5 illustrates a longitudinal, cross-sectional view of an upper assembly of a disconnect device according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(7) It is to be understood that the various embodiments of the present invention described herein may be utilized in various orientations, such as inclined, inverted, horizontal, vertical, etc., and in various configurations, without departing from the principles of the present invention. The embodiments are described merely as examples of useful applications of the principles of the invention, which is not limited to any specific details of these embodiments. In the following description of the representative embodiments of the invention, directional terms, such as “above,” “below,” “upper,” “lower,” etc., are used for convenience in referring to the accompanying drawings. In general, “above,” “upper,” “upward” and similar terms refer to a direction towards the earth's surface along a wellbore, and “below,” “lower,” “downward” and similar terms refer to a direction away from the earth's surface along the wellbore.

(8) FIGS. 1-3 illustrate an embodiment of a disconnect device 10. In embodiments, disconnect device 10 may comprise two major components: a lower receptacle assembly 11 (illustrated separately in FIG. 4) and an upper assembly 27 (illustrated separately in FIG. 5). These two components may be capable of coupling together and/or decoupling apart from each other by an operator, on command. Further, the two components, lower receptacle assembly 11 and upper assembly 27, may comprise a lower tool adapter 21 and an upper tool adapter 22, respectively, for connecting to various tubing stings and BHAs or tools. As such, disconnect device 10 may be capable of providing a controlled disconnect between workstrings or other tubing strings and various BHAs or tools during oil and/or gas operations. For instance, disconnection may occur between a downhole tool connected to disconnect device 10 by lower tool adapter 21 and a conduit such as, without limitation, a drill pipe, coiled tubing, or wireline with a pump, and a motor connected to upper tool adapter 22. In embodiments, lower receptacle assembly 11 may further comprise a receptacle opening 30, and upper assembly 27 may further comprise a shaft 14, a collet 12, a piston 18, and a cylindrical assembly 17.

(9) FIG. 1 illustrates an embodiment of disconnect device 10 in which lower receptacle assembly 11 and upper assembly 27 may be in an initial coupled state suitable for deployment in a well. Lower receptacle 11 and upper assembly 27 may be initially coupled in any suitable fashion and by any suitable means. For initial coupling, upper assembly 27 may be disposed within receptacle opening 30 and secured in place through the engagement of collet fingers 12a and a recess profile 13. In embodiments, collet fingers 12a may be radially-outward protrusions on collet 12, while recess profile 13 may be a groove disposed on an inner surface of lower receptacle assembly 11. Engagement of collet fingers 12a and recess profile 13 may be accomplished by positioning a piston 18 radially between shaft 14 of upper assembly 27 and collet 12, thus preventing radial collapse of collet fingers 12a. In embodiments, piston 18 may be a slidable component within upper assembly 27 that may be radially disposed above shaft 14 and attached to a spring 25. For at least the initial coupling, piston 18 may be secured into place under collet fingers 12a via a shear screw attachment 16 to cylindrical assembly 17, such that spring 25 may be partially compressed. In embodiments, this may result in secure connection between lower receptacle assembly 11 and upper assembly 27, and thus may allow for successful deployment of disconnect device 10 and any of its suitable attachments downhole.

(10) After deployment, should an operator need to disengage disconnect device 10, piston 18 may require displacement from its initial fixed position. In embodiments, removal of piston 18 from underneath collet fingers 12a may allow collet fingers 12a to collapse, and thus disengage with recess profile 13. FIG. 2 illustrates an embodiment of disconnect device 10 in which piston 18 may be in a pressure actuated state that allows for eventual disengagement of lower receptacle assembly 11 and upper assembly 27 after deployment in a well. In embodiments, upper assembly 27 may further comprise fluid passage 23 and pressure chamber 24. Fluid passage 23 may be a borehole disposed within shaft 14, suitable for passing any fluids and/or gases through shaft 14. Pressure chamber 24 may be a chamber located radially between shaft 14 and cylindrical assembly 17, as well as below piston 18. In embodiments, pressure chamber 24 may comprise a pressure tight seal, accomplished via O-ring seals 19 and 20. O-ring seal 19 may be disposed radially between piston 18 and cylindrical assembly 17, and O-ring 20 may be disposed radially between shaft 14 and piston 18. In order to displace piston 18, an operator may apply an actuating pressure within fluid passage 23 and pressure chamber 24 to any suitable level that may be capable of shearing shear screw attachments 16 and displacing piston 18 in an upward direction. In embodiments, shearing shear screw attachments 16 frees piston 18 and allows for movement to a pressure-actuated or second position that may further compress or fully compress spring 25, as well as continue to prevent collet fingers 12a from collapsing. Thus, lower receptacle assembly 11 and upper assembly 27 may remain fully engaged in this state.

(11) After freeing and displacing piston 18 to the pressure-actuated or second position, an operator may fully disengage disconnect device 10 by lowering the pressure levels within pressure chamber 24. In embodiment, lowering the pressure levels may be accomplished by releasing pressure, intentionally or unintentionally, from chamber 24 in any suitable fashion known in the art. The release of pressure in chamber 24 may allow piston 18, aided by the force of decompression of spring 25, to be displaced in a downward direction, diminishing pressure chamber 24. FIG. 3 illustrates an embodiment of disconnect device 10 in which piston 18 may be in a pressure-released state and position that allows for full disengagement of lower receptacle assembly 11 and upper assembly 27 after deployment in a well. In the pressure-released or third position, piston 18 may no longer be radially between shaft 14 and collet fingers 12a, but rather radially between shaft 14 and cylindrical assembly 17. This may allow for collet fingers 12a to collapse in the radial direction and disengage from recess profile 13, and therefore may allow lower receptacle assembly 11 and upper assembly 27 to disengage from each other or become disconnected by simple over-pull. In embodiments, upon disengagement, upper assembly 27 may be retrieved from a well by any suitable conduit. FIGS. 4 and 5 illustrate an embodiment of lower receptacle assembly 11 and upper assembly 27, respectively, fully disengaged or disconnected.

(12) In embodiments, disconnect device 10 may be utilized for any type of operation performed on an oil and/or gas well. In the case of an operation failure such as, without limitation, a leaking tubular, a malfunctioning pump or motor, or any combinations thereof, disconnect device 10 may be utilized to allow for the problem to be fixed at the surface of an oil and/or gas well. Once fixed, the system, which may be connected to upper assembly 27, may be redeployed in the oil and/or gas well and reconnected to lower receptacle assembly 11. In embodiments, reconnection of disconnect device 10 may be accomplished by stabbing upper assembly 27 into lower receptacle assembly 11, and further, applying pressure in pressure chamber 24. As such, piston 18 may be displaced in an upward direction and positioned radially between shaft 14 and collet fingers 12a. Once again, piston 18 may be in the pressure-actuated or second position, as was illustrated in FIG. 2, and disconnect device 10 comprising lower receptacle assembly 11 and upper assembly 27 may be fully engaged.

(13) It should be understood that the drawings and description thereto are not intended to limit the disclosure to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present disclosure.