DOWNHOLE TUBULAR ASSEMBLY OF A WELL TUBULAR STRUCTURE |
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申请号 | EP15165785.5 | 申请日 | 2015-04-29 | 公开(公告)号 | EP3088655A1 | 公开(公告)日 | 2016-11-02 |
申请人 | Welltec A/S; | 发明人 | Hazel, Paul; | ||||
摘要 | The present invention relates to a downhole tubular assembly configured to be mounted as part of a well tubular structure in a borehole of a well having a top. The downhole tubular assembly comprises a well metal tubing configured to be mounted as part of the well tubular structure, the well metal tubing having a longitudinal extension, a tubing length along the longitudinal extension, an inner diameter and an outer diameter defining a wall, and an inner face and an outer face. The downhole tubular assembly further comprises a tubular metal receptacle having an inner receptacle face and an outer receptacle face, a receptacle length and a first part closest to the top of the well, and having an inner receptacle diameter larger than the outer diameter of the well tubing part, and a second part extending from the first part towards the well metal tubing. The tubing length is larger than the receptacle length, and the wall of the well metal tubing extends inside the tubular metal receptacle along the entire length of the tubular metal receptacle, and the second part of the tubular metal receptacle is fastened to the outer face of the well metal tubing, thereby closing the tubular metal receptacle in one end and defining an annular space between the tubular metal receptacle and the well metal tubing. Furthermore, the invention relates to a well tubular structure for being arranged in a borehole in a well and to a downhole system configured to be arranged in a borehole of a well. Finally, the invention relates to a structure replacement method for replacing at least part of the well tubular structure of a downhole system. | ||||||
权利要求 | |||||||
说明书全文 | The present invention relates to a downhole tubular assembly configured to be mounted as part of a well tubular structure in a borehole of a well having a top. Furthermore, the invention relates to a well tubular structure for being arranged in a borehole in a well and to a downhole system configured to be arranged in a borehole of a well. Finally, the invention relates to a structure replacement method for replacing at least part of the well tubular structure of a downhole system. Oil and gas wells are completed in many different ways and have a variety of different designs. Some wells have cemented inner casings and some wells have uncemented inner casings. Cemented casings are completed after cementing the intermediate casing A and the lower part of the well is drilled so that the inner casing B can be submerged into the well, as shown in In order to be able to replace the upper inner casing with a drill pipe, the inner casing has a receptacle R into which sealing elements of the upper inner casing can be fit to create a good sealed connection after the drill pipe has been retracted. However, these sealed connections tend to deteriorate over time even though they have never been used, and thus, such wells may leak over time. It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art. More specifically, it is an object to provide an improved well tubular structure decreasing the risk of leaks occurring without limiting the possibility of increasing the annular space between the intermediate casing and the inner casing. The above objects, together with numerous other objects, advantages and features, which will become evident from the below description, are accomplished by a solution in accordance with the present invention by a downhole tubular assembly configured to be mounted as part of a well tubular structure in a borehole of a well having a top, the downhole tubular assembly comprising:
wherein the tubing length is larger than the receptacle length, and the wall of the well metal tubing extends inside the tubular metal receptacle along the entire length of the tubular metal receptacle, and the second part of the tubular metal receptacle is fastened to the outer face of the well metal tubing, thereby closing the tubular metal receptacle in one end and defining an annular space between the tubular metal receptacle and the well metal tubing. In an embodiment, the annular space may be at least filled with a fluid for preventing deterioration of the inner receptacle face of the tubular metal receptacle. The fluid may be grease or silicone. Furthermore, the fluid may be an inert gas or noble gas. In another embodiment, the inner receptacle face of the tubular metal receptacle may be at least partly polished. Also, the inner receptacle face of the tubular metal receptacle may be at least partly provided with a thread. In yet another embodiment, the second part of the tubular metal receptacle may be fastened by welding or a threaded connection or crimping so that it connects to the outer face of the well metal tubing. Furthermore, the tubular metal receptacle may comprise a sealing element for sealing off the annular space. Moreover, the sealing element may comprise an elastomeric material, a metal, a polymer, rubber or any combination thereof. In addition, the tubular assembly may comprise a circumferential recess having an inner recess diameter larger than the inner diameter of the well metal tubing, the recess being configured to receive a projecting element of a tool string and being arranged at a predetermined distance from the second part of the tubular metal receptacle. Moreover, an identification tag may be arranged at the tubular metal receptacle for identifying the position of the tubular metal receptacle, especially the second part of the tubular metal receptacle. The downhole tubular assembly described above may further comprise an annular barrier comprising a tubular metal part for mounting as part of the well tubular structure; an expandable metal sleeve surrounding the tubular metal part and having an inner face facing the tubular metal part and an outer face, each end of the expandable metal sleeve being connected with the tubular metal part; and an annular space between the inner face of the expandable metal sleeve and the tubular metal part. The present invention furthermore relates to a well tubular structure made of metal for being arranged in a borehole in a well, comprising a plurality of tubular sections, at least one of the tubular sections being the downhole tubular assembly according to any of the preceding claims. In an embodiment, at least one of the tubular sections may comprise an annular comprising a tubular metal part for mounting as part of the well tubular structure; an expandable metal sleeve surrounding the tubular metal part and having an inner face facing the tubular metal part and an outer face, each end of the expandable metal sleeve being connected with the tubular metal part; and an annular space between the inner face of the expandable metal sleeve and the tubular metal part. Furthermore, at least one of the tubular sections may comprise a circumferential recess. The circumferential recess may be arranged at a predetermined distance from the second part of the tubular metal receptacle. The present invention furthermore relates to a downhole system configured to be arranged in a borehole of a well, comprising:
In an embodiment, the downhole system may comprise a tool string comprising a tubing cutting tool. In another embodiment, the tool string may further comprise a docking unit having a projecting element being configured to engage with the circumferential recess. The tubing cutting tool and the projecting element may have a mutual tool distance between them, the tool distance and the predetermined distance between the circumferential recess and the second part of the tubular metal receptacle being substantially equal. Furthermore, the tool string may comprise a logging unit configured to detect an identification tag. Finally, the present invention relates to a structure replacement method for replacing at least part of the well tubular structure described above of a downhole system described above, comprising the steps of:
In an embodiment, the step of positioning the tubing cutting tool may be performed by engaging a projecting element in the circumferential recess, the tubing cutting tool and the projecting element having a mutual tool distance between them, the tool distance and the predetermined distance between the circumferential recess and the second part of the tubular metal receptacle being substantially equal. Furthermore, the step of positioning the tubing cutting tool may be performed by a logging tool identifying an identification tag arranged at the tubular metal receptacle. Moreover, sealing elements may be arranged on an outside face of the new well tubular structure, which outside face is arranged opposite the inner receptacle face of the tubular metal receptacle to provide a sealing between the tubular metal receptacle and the new well tubular structure. The invention and its many advantages will be described in more detail below with reference to the accompanying schematic drawings, which for the purpose of illustration show some non-limiting embodiments and in which
All the figures are highly schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the invention, other parts being omitted or merely suggested. The downhole tubular assembly 1 of The well metal tubing 6 is thus intact and uninterrupted opposite the metal receptacle 9, and when the well metal tubing is mounted as part of the well tubular structure 2, there is no sealing risk as there is no interrupted well tubing parts opposite the metal receptacle 9 as in the known solutions. In the event that calculations and tests show that the upper section of the well tubular structure above the metal receptacle 9 needs to be replaced with a drill pipe, a tool string 24 comprising a tubing cutting tool 25 is submerged into the well tubular structure 2 so that a projectable cutting part 29 is arranged opposite the metal receptacle 9 and cuts a first section 34 of the well metal tubing 6 from a second section 36 of the well metal tubing 6, as shown in As shown in The inner receptacle face 10 of the tubular metal receptacle 9 is polished at least along the first part 12. The annular space 15 of In In Another way of identifying the position of the tubular metal receptacle 9, especially the second part 14 of the tubular metal receptacle, and thus where to cut is to identify an identification tag 20 arranged in the tubular metal receptacle, as shown in As shown in As shown in As shown in The downhole system 100 of In By well fluid is meant any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc. By gas is meant any kind of gas composition present in a well, completion, or open hole, and by oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc. Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively. By a casing or a well tubular structure is meant any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production. The well tubular structure is made of metal and mounted from tubular sections. In the event that the tool is not submergible all the way into the casing, a downhole tractor can be used to push the tool all the way into position in the well. The downhole tractor may have projectable arms having wheels, wherein the wheels contact the inner surface of the casing for propelling the tractor and the tool forward in the casing. A downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®. Although the invention has been described in the above in connection with preferred embodiments of the invention, it will be evident for a person skilled in the art that several modifications are conceivable without departing from the invention as defined by the following claims. |