Patent Grant
7373970
The present embodiments relate generally to pin connector with a seal assembly that can be used in downhole well.
A need exists for an intelligent completion system for use inside a multi-zone hydrocarbon well.
There further exists a need for a pin connector with seal assembly that can be pulled after use, taken apart, cleaned, and reused.
The present embodiments meet these needs.
The detailed description will be better understood in conjunction with the accompanying drawings as follows:
a depicts a cross sectional view of an embodiment of a upper tubular body with at least one alignment groove that is usable with the embodiments of the pin connector with seal assembly.
b is a perspective view of the upper tubular body with the alignment groove.
The present embodiments are detailed below with reference to the listed Figures.
Before explaining the present embodiments in detail, it is to be understood that the embodiments are not limited to the particular embodiments and that they can be practiced or carried out in various ways.
The embodiments of the invention relate generally to a pin connector with a seal assembly using a unique wet connect assembly. The pin connector is formed from a tubular having an upper tubular portion and a lower tubular portion.
The lower tubular portion has an upper tubular body and a lower tubular body with a lower tubular body face.
A first pin engages the wet connect assembly. The first pin has a first pin outer surface, which can be connected to the wet connect assembly.
In a second embodiment a double pin is in the lower tubular portion. The double pin engages the wet connect assembly. In the double pin embodiment, a second pin concentrically surrounds the first pin forming a double pin connector. The double pin connector is particularly useful in packers such as those adapted for multi zone gravel packing in hydrocarbon wells.
In either the single pin or double pin version of the pin connector with seal assembly, a control line connector, such as a jam nut, is used on the first pin outer surface and the lower tubular body face.
At least one alignment key is formed in at least a part of the tubular body. The alignment key can be disposed on an inner diameter of the tubular body and can extend from a top portion of the lower tubular body toward a mid section of the lower tubular body. The alignment key, in an embodiment, is formed at an angle from the top, sloping in a curve, such as a sine curve along the lower tubular body. The alignment key extends no more than 10% the length of the lower tubular body.
In an alternative embodiment of the pin connector with seal assembly, the at least one alignment key can be disposed on an interior wall of the tubular body portion. Multiple alignment keys can be used on one tubular body portion for a secure locking engagement.
The lower tubular body has a lower hydraulic flow path formed within the lower tubular body for flowing controlled hydraulic fluids. This lower hydraulic flow path communicates on one end with a hydraulic wet connector.
Additionally, a two part locking mechanism can be used to connect the upper tubular portion to the lower tubular portion In an embodiment, one part of the locking mechanism has a collar. The collar can be threaded or force fit to the second part of the locking mechanism. Additionally, a lower tubular seal can be disposed between the collar and the lower tubular portion to ensure a snug, leak-tight fit.
The two part locking mechanism can be used to secure the upper tubular portion or the seal assembly to another piece of well equipment.
The second part of the locking mechanism is a locking key. The locking key is engaged by a shear pin. The shear pin further engages a lower key retainer. The locking key is also engaged using a upper key retainer. The upper key retainer engages the upper tubular portion. The upper portion of the locking mechanism has at least one fastener, such as a screw, to secure the upper portion of the locking mechanism. A force is exerted on the upper tubular portion and the locking key by a mechanism, such as a coiled spring, a wave spring, or similar force applying mechanism.
The upper tubular portion is removably connected to the lower tubular portion, such as with force fit connection or stabbed in connection. It is also contemplated that the upper tubular portion can be stabbed into the lower tubular portion for a secure connection, such as a body lock ring.
The upper tubular portion has a receiving hydraulic wet connector, which removably engages the extending hydraulic wet connector of the lower tubular portion.
In an embodiment, the receiving hydraulic wet connector is a quick release hydraulic wet connector, which is particularly useful in an emergency, such as when there is an excessive pressure build up and there is a need for a fast release.
An intermediate hydraulic flow path is also formed in the upper tubular body. The intermediate hydraulic flow path fluidly engages the lower hydraulic flow path.
At least one alignment groove is formed on the upper tubular body. The alignment groove is for receiving at least one alignment key. At least one alignment key is formed in the upper tubular body, and an alignment groove is formed in the lower tubular portion for receiving the at least one alignment key.
In the present embodiment of the pin connector with seal assembly, the upper tubular portion removably engages a seal assembly. The seal assembly can include a tubular seal assembly body. In the tubular seal assembly an upper hydraulic flow path can be formed which fluidly engages the intermediate hydraulic flow path.
Between the tubular seal assembly body and the upper tubular body there can be a plurality of upper hydraulic flow path seals. The hydraulic flow path seals are contemplated to be non-elastomeric, such as metal to metal seals. The hydraulic flow path seals can have different diameters from each other. In another embodiment, the hydraulic flow path seals are all the same diameter.
A plurality of upper concentric seals can be positioned, such that they form a sealing engagement around the upper hydraulic flow path seals. A sealing engagement can be formed in the upper hydraulic flow path by using a plurality of seal assembly fasteners to apply a force to the upper hydraulic flow path seals. An example of a seal assembly fastener is a snap ring. The seal assembly fasteners can be made from any alloy steel readily available from Smalley Spring Company, Chicago, Ill.
In an embodiment at least one seal ring can be used for supporting, such as rigidly supporting, at least one upper hydraulic flow path seal. The seal ring can be made from a plastic or alloy steel.
A hydraulic flow path plug can be used to provide a sealing engagement with the upper hydraulic flow path and the tubular seal assembly body. The plug can have a diameter of between 0.032 inches and 0.500, and a length of between 0.125 and 0.562.
The pin connector with seal assembly can be used within a packer to form an integrated wet connect assembly. The integrated wet connect assembly preferably engages a valve and production tubing on one end and another seal assembly on the other end of the integrated wet connect assembly.
The embodiments of the pin connector with seal assembly reduce installation time and the costs associated with downhole hydrocarbon production.
An embodiment of the pin connector with seal assembly provides a downhole well equipment that is more efficient because there is no field assembly required.
An embodiment of the pin connector with seal assembly can be assembled at a remote location, and can be ready for immediate use upon reaching the field.
An embodiment of the pin connector with seal assembly is a well containment feature because the downhole assembly is stung in or engaging the well. Thereby, isolating the well and preventing well bore fluid from leaking into the annulus above the packer, preventing a well control situation. The seal assembly prevents fluid from leaking into the environment and contaminating water tables.
The embodiments of the invention can be best understood with reference to the figures.
Referring now to
The tubular seal assembly body 4 can be made from alloy steel, and can have a length ranging from 10 inches to 36 inches, a diameter ranging from 2.688 inches to 6 inches. The seal assembly body 4 is depicted having the hydraulic flow path plug 6, such as a lee plug from Lee Company in Connecticut. The hydraulic flow path plug 6 provides a seal for the upper hydraulic flow path 10.
The hydraulic flow path can have a volumetric flow rate equivalent to the capacity of a 0.25 inch control line. The hydraulic flow path can be formed into the tubular seal assembly by inserting a hydraulic line with a diameter ranging from 0.25 inches to 0.5 inches.
The first seal ring 16a can support a first hydraulic flow path seal 12a and be made from an alloy steel or non elastomeric material, such as a rigid polyethylene seal ring or rigid polyethylene/polypropylene copolymers.
The second seal ring 16b can support the second hydraulic flow path seal 12b. The first seal ring 16a and the second seal ring 16b provide support to the hydraulic flow path seals 12a and 12b.
The first hydraulic flow path seal 12a and the second hydraulic flow path seal 12b can be similar to each other or in the alternative the first and second hydraulic flow path seals 12a and 12b can be different. The first and second hydraulic flow path seals 12a and 12b can have a diameter ranging from 1.9 inches to 6.75 inches. The flow path seals can be made from non elastomeric materials, such as polymer plastics, including poly ethyl ketone (PEEK), or other materials.
The first seal ring 16a, the second seal ring 16b, and the third seal ring 16c can be similar in design or in the alternative each seal ring can be made from a different material. The diameters of each seal ring can be similar or different.
The first seal assembly fastener 14a can be a threaded cap. The second seal assembly fastener 14b, which can be similar to the first seal assembly fastener 14a. The fasteners are adapted to retain the second upper hydraulic flow path seal 2b.
The third seal assembly fastener 14c, which can be similar to the second seal assembly fastener 14ab, which can be similar to the first seal assembly 14a.
It is possible to have an embodiment wherein the first seal assembly fastener, the second seal ring fastener, the third seal ring fastener can be made from steel.
The first, second and third concentric seals 8a, 8b, and 8c can be an elastomeric or non-elastomeric seal. Greene Tweed from Houston Tex. supplies usable concentric seals for this embodiment. The first concentric seal 8a, the second concentric seal 8b, and the third concentric seal 8c can be similar to each other.
Turning now to
Returning to
The intermediate hydraulic flow path 29 and the upper hydraulic flow path 10 are coupled together, for example using the seals.
Referring now to
A locking key 32 is machined as part of the overall pin and seal assembly in to the upper tubular of the lower tubular portion or both. The locking key is a combination of grooves and projections that interlock together.
A lower key retainer 34 is a machined part used for holding the locking key in either the locked or unlocked position. In an embodiment, the lower key retainer can be a circular part with a diameter larger than the annulus of the bore of the tool. The retainer can be a segment, such as a “D” shape or an open “D” shape.
An upper key retainer 38 can be similar to the lower key retainer. In an embodiment, the upper key retainer can be a circular part with a diameter larger than the annulus of the bore of the tool. The upper key retainer can be a segment, such as a “D” shape or an open “D” shape.
The mechanism for providing force 42 can be a coiled spring, a wave spring, or a similar force providing mechanism. If a coiled spring is used, it can be one provided by Suhm of Houston, Tex.
The shear pin 36 engages the locking key 32 and the lower key retainer 34. The shear pin 36 can be a solid cylinder with a centrally aligned through hole. The shear pin 36 can be made from steel, stainless steel, or similar materials.
The upper key retainer 38 can have a channel, with a depth ranging from 0.5 inches to 1 inches adapted for receiving the locking key 32.
The upper portion 30 is secured to upper tubular portion 26 by the first fastener 40a and the second fastener 40b. The first fastener 40a and the second fastener 40b can be planarly aligned with each other. It is possible to use more than two fasteners to secure the upper locking mechanism to the upper tubular portion 26.
The mechanism for exerting force 42 interacts with the locking key 32 and the upper tubular portion 26.
The interaction of the mechanism for exerting force 42 with the locking key 32 and the upper tubular portion 26 provides the benefit of providing retraction in and out, an axial force when the lower tubular portion is driven into the well, in a ratcheting unidirectional motion.
Returning to
The fastener 23 can be a collar for engaging the upper portion 30 and anchoring the upper tubular portion to another piece of well equipment.
The upper tubular portion has a receiving hydraulic wet connector 27, for example, a Seaport wet connect made by Diamould from the United Kingdom. The receiving hydraulic wet connector 27 removably engages an extending hydraulic wet connector 22, which can also be made by Diamould. The receiving hydraulic wet connector 22 is supported by the upper tubular body 28.
The upper tubular body 28 supports the receiving hydraulic wet connector 22 by creating a threaded engagement with the receiving hydraulic wet connector 22,
Although the embodiment in
Turning now to
The first alignment groove 44a and the second alignment groove 44b can have a depth ranging from 0.30 inches to 0.05 inches. The alignment grooves can be molded, machined, or forged into the upper tubular body 28.
Turning now to
A lower hydraulic flow path 20 is formed into the lower tubular body 15. The lower hydraulic flow path 20 fluidly engages the intermediate hydraulic flow path 29. The fluid engagement is enabled by a coupling.
The lower hydraulic flow path 20 can be a port machined into the lower tubular body 15.
In a typical embodiment of the invention each of the hydraulic flow paths have the same hydraulic fluid and the same flow rate.
The lower tubular body has a lower tubular body face 13. The lower tubular body face 13 can have a flange angle ranging from 30 degrees to 90 degrees. The lower tubular body face 13 can be made from a metal adapted to survive a highly corrosive environment.
The lower tubular portion further has a first pin 16. The pin 16 can be manufactured by Pertroquip Energy Services of Broussard, La. and Houston, Tex. The first pin 16 can have a length ranging from 3 inches to 9 inches. The first pin 16 can have a cylindrical shape and can be solid or hollow.
The first pin 16 has a first pin outer surface 17. The first pin outer surface can be a metal, a composite, or a similar material. The first pin outer surface 17 in a typical embodiment will be made form the same material of the first pin 16
In the embodiment depicted in
While these embodiments have been described with emphasis on the embodiments, it should be understood that within the scope of the appended claims, the embodiments might be practiced other than as specifically described herein.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5927402 | Benson et al. | Jul 1999 | A |
| 5967816 | Sampa et al. | Oct 1999 | A |
| 6983796 | Bayne et al. | Jan 2006 | B2 |
