IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0543909
(2009-08-19)
|
등록번호 |
US-8496273
(2013-07-30)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
3 |
초록
▼
An improved reemployable tubular connection system and method for oil field application disposes an axially asymmetric seal in a coupling sleeve interconnecting the oppositely entered pin ends of two tubing sections. The sleeve includes an approximately central interior surface for seating a deforma
An improved reemployable tubular connection system and method for oil field application disposes an axially asymmetric seal in a coupling sleeve interconnecting the oppositely entered pin ends of two tubing sections. The sleeve includes an approximately central interior surface for seating a deformable seal having oppositely directed tapered edges with different angles of convergence. The pin ends enter into and resiliently displace the edges of the seal, which may be made differentially adhesive so that a tubing connection may be broken and remade a number of times.
대표청구항
▼
1. An oil field connection system for production and injection tubing sections comprising: a sleeve coupling having an interior seating span of predetermined axial length and defining a seating surface of substantially constant inner diameter and with the sleeve coupling including oppositely axially
1. An oil field connection system for production and injection tubing sections comprising: a sleeve coupling having an interior seating span of predetermined axial length and defining a seating surface of substantially constant inner diameter and with the sleeve coupling including oppositely axially extending mill end and field end female threaded sections adjacent to the seating span and both having the same threads;a mill end of a first one of the production and injection tubing sections and a field end of a second one of the production and injection tubing sections, each with male thread pin ends configured to be inserted into, and coupled to the respective mill and field end female threaded sections of the sleeve coupling; anda deformable seal ring, the seal ring having an outer diameter positioned in the seating span of the sleeve coupling and having an outer surface conforming to the seating surface, the seal ring including an approximately central portion and oppositely extending asymmetric mill end and field end terminal sections which taper at different angles of taper with respect to each other and with mill end and field end terminal section lengths different from each other, the mill end and field end terminal sections each extending longitudinally from the central portion of the seal ring toward respective axial ends of the seal ring, the mill end and field end terminal sections of the seal ring extending to respective positions to be intercepted by starting thread areas of the pin ends of the inserted mill and field ends of the first and second ones of the production and injection tubing sections and being deformed by the starting thread areas of the pin ends of the tubing sections, the field end terminal section of the seal ring being longer than the mill end terminal section of the seal ring, multiple connections of the pin end of the field end of the second one of the production and injection tubing sections with the field end section of the sleeve coupling resulting in increasing penetration of the pin end of the field end of the second one of the production and injection tubing sections into the field end terminal section of the seal ring with each such connection. 2. The oil field connection system as set forth in claim 1 above wherein the seal ring is a deformable synthetic material and the terminal sections are deformed by the first 1½ to 2½ starting thread areas of the male thread pin ends of the mill and field tubing sections. 3. The oil field connection system as set forth in claim 1 above, wherein the mill end terminal section of the seal ring has a first converging taper angle with respect to a longitudinal tubing axis, and which is greater than a field end terminal section second converging taper angle. 4. The oil field connection system as set forth in claim 3 above, wherein the seating span of the sleeve coupling is longitudinally offset from a longitudinal center of the sleeve coupling by a distance to compensate for the different first and second taper angles of the mill end and field end terminal sections of the ring seal. 5. The oil field connection system as set forth in claim 4 above, wherein the deformable seal ring is volumetrically displaced by the inserted male thread pin ends, and wherein the male thread pin ends each penetrate and deform an end of the seal ring to substantially less than a full axial extent of the mill end and field end terminal sections. 6. The oil field connection system as set forth in claim 5 above, wherein the mill and field tubing sections each include applied indicia at predetermined longitudinal spacings from the pin ends and which indicia is usable to demarcate a desired depth of insertion of a pin end into the sleeve coupling, the connection being made up such that the longitudinal indicia are substantially aligned with the longitudinal end of the sleeve coupling. 7. The oil field connection system as set forth in claim 1 above, wherein the pin ends have been machined, wherein the pin ends are plastic coated, and wherein the deformable seal ring is of non-reinforcement Teflon. 8. The oil field connection system as set forth in claim 1 above, wherein the mill and field tubing sections further comprise inner fiber glass liners, the inner fiber glass liners further each including an orthogonally disposed terminal ring of a diametric dimension that exceeds an end diametral thickness of each pin end, and wherein the seal ring has a volume such that when it is deformed by displacement of the mill end and field end terminal sections by the inserted starting thread areas of the pin ends, it is deformed to a shape wherein an inner diameter of the seal ring in the approximately central portion is substantially collinear with an inner diameter of the mill and field end tubing sections. 9. A tubular connection system for oil field production and injection tubing connection applications to connect mill ends and field ends of lengths of production and injection tubular pipes and comprising the combination of: a string of the production and injection tubular pipes, each tubular pipe having a tapered male threaded mill pin end and a tapered, male threaded field pin end;a series of tubular sleeve couplings for interconnecting pairs of the production and injection tubular pipes in end-to-end relation, to define the string of production and injection tubular pipes, each sleeve coupling having a longitudinal section with a uniform inner diameter forming a seating span and adapted to receive a seal ring, the sleeve couplings and the tubular pipes being disposed along a tubing string axis and each sleeve coupling further including a mill end female threaded section and a field end female threaded section extending from the seating span to a terminal end of the sleeve coupling, the mill end and field end female threaded sections each being configured to mate with one of the threaded pin ends of one the production and injection tubular pipes; anda plurality of resilient seal rings, each having an outer diameter section sized to be positioned within the seating span of a selected one of the series of tubular sleeve couplings and each including an inner diameter received in the seating span that is greater than an inner diameter of the tubular pipes, each resilient seal ring further including integral tapered asymmetric mill end and field end terminal sections extending longitudinally to the tubing string axis, and in opposite directions from the seating span, wherein the mill end terminal section is disposed having a first axial length and with a first taper angle relative to the tubing string axis and being configured to be engaged by the starting thread areas of the mill pin end at the mill end of the connection, and wherein the field end terminal section has a second taper angle less than the first taper angle, and a second axial length longer than the first axial length and being positioned at the field end side of the connection, the tapered mill end and field end terminal sections each being deformed by a leading edge of the starting thread area of the inserted male threaded pin end of the adjacent tubular pipe, and the tubular connection system further including a sealing coating disposed between the mill pin end and the sleeve coupling for augmenting adhesion between the mill end pipe and the sleeve coupling, such that, in use, each connection can be broken and remated during multiple couplings in the field by applying torque to the field end pipe and by removing each field end pipe for later reengagement with, and increased penetration of the starting thread area of the field end pin end into the field end tapered section of each resilient ring seal with each such coupling. 10. A tubing connection for production and injection petroleum well applications in which tubing sections each having male threaded tubing mill and field pin ends are configured to fit into opposite ends of a threaded sleeve coupling, wherein the threaded sleeve coupling has a seating span with an interior axial length of substantially constant interior diameter and defining a seating surface and having mill end and field end female threaded sections positioned to receive terminal portions of male threaded mill and field pin ends of ones of the tubing sections to be connected, and wherein the tubing connection further comprises a deformable seal ring having an outer diameter portion conforming with the seating surface of the sleeve coupling, the seal ring including an asymmetric, differentially longitudinally tapered and a differentially longitudinal length pair of mill end and field end terminal sections extending axially in opposite longitudinal directions with respect to each other from an intermediate region to longitudinal terminal positions of the seal ring such that each terminal section is deformed by starting thread areas of a proximate inserted one of the mill end and field end pin tubing ends and is displaced thereby with no permanent deformation, the field end terminal section of the seal ring being longer than the mill end terminal section of the seal ring to accomplish multiple connections of at least the pin end of the field tubing section with the field end section of the sleeve coupling, with increasing penetration of the starting thread area of the pin end of the field tubing section into the field end terminal section of the ring seal, with each such connection. 11. The tubing connection as set forth in claim 10 above, wherein the asymmetric terminal sections of the seal ring are configured with the mill end terminal section being longitudinally shorter and having a steeper taper than the field end terminal section. 12. The tubing connection as set forth in claim 11 above, wherein engagement of the starting thread area of one of the mill end tubing pin ends into the mill end of the ring seal introduces a first displacement of the mill end tapered section and further wherein a total displacement of the ring seal is greater than the first displacement. 13. The tubing connection as set forth in claim 10 above, wherein the tubing connection further comprises a water setting sealant disposed on the mill end female threaded section of the threaded sleeve coupling, for augmenting adhesion between the male threaded tubing mill pin end and the threaded sleeve coupling for differential breakout at the male threaded tubing field pin end side on repeated breakouts of the field pin end of the tubing section from the threaded sleeve coupling field end terminal section. 14. The tubing connection as set forth in claim 10 above, wherein the tubing sections each include a fiberglass liner, and wherein the deformable seal ring is configured with an inwardly directed central ridge and has a volume such that when the seal ring is deformed by the starting thread areas of the fully inserted tubing mill and field pin ends, the seal ring central ridge deforms to form an internal seal ring diameter that is substantially flush with an inner diameter of the fiberglass liner.
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