Downhole tubular system and assembly for sealing an opening
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-033/10
E21B-033/13
E21B-043/10
출원번호
US-0363872
(2012-12-21)
등록번호
US-9523257
(2016-12-20)
우선권정보
EP-11195620 (2011-12-23)
국제출원번호
PCT/EP2012/076540
(2012-12-21)
국제공개번호
WO2013/092944
(2013-06-27)
발명자
/ 주소
Hallundbæk, Jørgen
Andersen, Tomas Sune
출원인 / 주소
WELLTEC A/S
대리인 / 주소
Nixon & Vanderhye P.C.
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
The present invention relates to a downhole system (100) for sealing an opening (2) in a wall of a well tubular structure in a borehole (4) downhole by means of a downhole tubular assembly (1), comprising the downhole tubular assembly comprising an expandable tubular part (5) having an inner face (6
The present invention relates to a downhole system (100) for sealing an opening (2) in a wall of a well tubular structure in a borehole (4) downhole by means of a downhole tubular assembly (1), comprising the downhole tubular assembly comprising an expandable tubular part (5) having an inner face (6) and an unexpanded expandable tubular thickness in an unexpanded state, and a helical spring (7) having a helical inner diameter, a radial helical spring thickness and a helical outer diameter in an unexpanded state, the helical spring being arranged inside the expandable tubular part and substantially concentrically with the expandable tubular part, an expansion tool (9) for expanding the tubular assembly inside the well tubular structure (3) in one direction, the expansion tool comprising an expansion part having a diameter, and the expansion tool being arranged substantially on an axis which is concentric and longitudinal with the tubular assembly, and positioned in a first position, wherein the expandable tubular part is expanded by moving the expansion tool from the first position through the expandable tubular part and the helical spring so that the helical spring extends the diameter of the expansion part and acts as a distance element when expanding the expandable tubular part to abut the well tubular structure for sealing the opening. Furthermore, the present invention relates to a downhole tubular assembly and a method of sealing an opening in a wall of a well tubular structure in a borehole downhole.
대표청구항▼
1. A downhole system for sealing an opening in a wall of a well tubular structure in a borehole downhole by means of a downhole tubular assembly, comprising: the downhole tubular assembly comprising: an expandable tubular part having an inner face and an unexpanded expandable tubular thickness in an
1. A downhole system for sealing an opening in a wall of a well tubular structure in a borehole downhole by means of a downhole tubular assembly, comprising: the downhole tubular assembly comprising: an expandable tubular part having an inner face and an unexpanded expandable tubular thickness in an unexpanded state;an expansion tool for expanding the tubular assembly inside the well tubular structure in one direction, the expansion tool comprising: an expansion part having a diameter, and the expansion tool being arranged substantially on an axis which is concentric and longitudinal with the tubular assembly, and positioned in a first position, and wherein the expansion tool further comprises:a helical spring arranged concentrically around the axis of the expansion tool, the helical spring having a helical inner diameter, a radial helical spring thickness and a helical outer diameter in an unexpanded state, the helical spring being arranged inside the expandable tubular part and substantially concentric with the expandable tubular part, and wherein the expandable tubular part is expanded by moving the expansion tool from the first position through the expandable tubular part and the helical spring so that the helical spring extends the diameter of the expansion part and acts as a distance element when expanding the expandable tubular part to abut the well tubular structure for sealing the opening. 2. A downhole system according to claim 1, wherein the expansion tool comprises a shaft connected with a tapered part of the expansion part. 3. A downhole system according to claim 2, wherein the tubular assembly is arranged between the expansion part and a back stop arranged on the shaft, the back stop having a recess corresponding to that of the tapered part of the expansion part so as to receive the expansion part. 4. A downhole system according to claim 1, wherein the helical spring is attached, in one end, to the expansion tool. 5. A downhole system according to claim 1, wherein the expansion tool further comprises a helical spring retraction part the helical spring retraction part being slidable in relation to the expansion part to move the helical spring in a direction opposite the direction of the expansion, thereby causing the helical spring to revert to the initial position on the shaft. 6. A downhole system according to claim 1, wherein the well tubular structure has an outer diameter which is substantially unchanged after expansion of the tubular assembly. 7. A downhole system according to claim 1, wherein the helical spring comprises a surface layer that provides low friction when slid against a surface of an inner wall of the expandable tubular part, a surface of the expansion part, and when slid against the surface of the helical spring itself. 8. A downhole system according claim 1, wherein the tubular assembly comprises a plurality of helical springs, and wherein the helical springs are arranged inside the expandable tubular part and substantially concentrically with the expandable tubular part, allowing for expansion of the expandable tubular part to abut the well tubular structure. 9. A downhole system according to claim 1, wherein the inner face of the expandable tubular part is in contact with the helical spring in an unexpanded state. 10. A method for sealing an opening in a wall of a well tubular structure in a borehole downhole, comprising the steps of: determining a position in order to seal the opening, cover a leakage or a perforated zone or strengthen the wall of the well tubular structure,arranging a downhole system according to claim 9 opposite the position for setting an expandable tubular part of the tubular assembly,expanding the tubular assembly until the expandable tubular part abuts the inner surface of the well tubular structure by moving an expansion tool of the downhole system through the inside of the tubular assembly, unwinding the helical spring, andletting the helical spring return, at least partly, to a relaxed condition of the helical spring, thereby removing the helical spring from the expandable tubular part when the expandable tubular part has been expanded in its entire length and seals off the opening. 11. A method for sealing a plurality of openings according to claim 10, further comprising the step of moving the helical spring out of contact with the expansion part of the expansion tool by means of the helical spring retraction part. 12. A method for sealing a plurality of openings according to claim 10, further comprising the step of arranging a second expandable tubular part around the helical spring, thereby reusing the helical spring. 13. A downhole system according to claim 1, wherein the inner face of the expandable tubular part is out of contact with the helical spring in an unexpanded state. 14. A downhole system according to claim 1, wherein the helical spring is wound of a strand having a circular cross-sectional shape, a quadratic cross-sectional shape or an octagonal cross-sectional shape. 15. A downhole system according to claim 1, wherein the helical spring is wound of a strand having rounded corners in cross-section. 16. A downhole system according to claim 1, wherein the helical spring is made of a material having a higher yield strength than that of the expandable tubular part and/or of materials with good spring effect or non-adhesive effects on the expandable tubular part. 17. A downhole system according to claim 1, wherein the helical spring is made of metal, such as carbon steels, alloy steels, corrosion resisting steels, phosphor bronze, spring brass, beryllium copper, nickel alloy steels, titanium alloy steels, music wire, non-ferrous alloy wire, high temperature alloy wire, or any combination thereof. 18. A downhole system according to claim 1, wherein the helical spring comprises a surface layer that provides low friction when slid against a surface of the inner wall of the expandable tubular part, a surface of the expansion part of the downhole system, and when slid against the surface of the helical spring itself. 19. A downhole system according to claim 18, wherein the surface layer comprises a carbon-containing steel, a Teflon coating layer, an Aluminium magnesium boride layer (BAM), a titanium layer, a stainless steel layer or a steel layer. 20. A downhole system according to claim 1, wherein the tubular assembly comprises a plurality of helical springs, and wherein the helical springs are arranged inside the expandable tubular part and substantially concentrically with the expandable tubular part, allowing for expansion of the expandable tubular part to abut the well tubular structure.
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이 특허에 인용된 특허 (2)
Hawkins James T. ; Hawkins Michael, Composite multi-wave compression spring.
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