EP3246513A1 - Bohrlochsystem mit seitlichen abschnitten - Google Patents

Bohrlochsystem mit seitlichen abschnitten Download PDF

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Publication number
EP3246513A1
EP3246513A1 EP16169973.1A EP16169973A EP3246513A1 EP 3246513 A1 EP3246513 A1 EP 3246513A1 EP 16169973 A EP16169973 A EP 16169973A EP 3246513 A1 EP3246513 A1 EP 3246513A1
Authority
EP
European Patent Office
Prior art keywords
tubular
lateral
recess
downhole system
well
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16169973.1A
Other languages
English (en)
French (fr)
Inventor
Christian Krüger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welltec AS
Original Assignee
Welltec AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Welltec AS filed Critical Welltec AS
Priority to EP16169973.1A priority Critical patent/EP3246513A1/de
Publication of EP3246513A1 publication Critical patent/EP3246513A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0035—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches

Definitions

  • the present invention relates to a downhole system for completing a well having a borehole and a top and to a completion method for completing a well comprising the downhole system.
  • the laterals When making laterals, the laterals are drilled from within the well tubular metal structure or main casing and out through the casing wall, and then the lateral tubular assembly is inserted into the though-bore in the casing wall and further into the lateral.
  • the lateral tubular assembly decreases the inner diameter of the casing, which makes the flow of production fluid in the casing less efficient.
  • increasing the inner diameter of the casing at the lateral would weaken the casing too much, and there is therefore a need for another solution for making a lateral junction without reducing the flow of production fluid in the casing.
  • a downhole system for completing a well having a borehole and a top comprising:
  • the lateral tubular assembly may have a flange.
  • the flange may be an annular flange.
  • the lateral tubular assembly may comprise a pipe section extending from the flange in through the through-bore.
  • a sealing element may be arranged between the flange and the tubular part.
  • the second part section may have a recess and the through-bore may extend from the recess to an outer face of the second part section.
  • the recess may be configured to receive the flange of the lateral tubular assembly.
  • the second part section may have the recess when submerged into the well or the recess may be made after the second part section has been submerged into the well.
  • the recess may be made in situ downhole.
  • the recess may be made by milling or from acid.
  • the second part section may have a first area comprising the recess and the through-bore, and a second area without the recess and the through-bore, and the first area may have an inner diameter larger than an inner diameter of the second area.
  • the first area may partly be made of a first material different from a second material of the second area.
  • first material may be removable by acid, whereas the second material may not be.
  • the first material may be easier to machine than the second material.
  • the first area may have a wall thickness which is equal to or larger than a wall thickness of the first part section.
  • the second area may have an inclining outer face.
  • the recess may be circumferential and extend along the inner diameter of the tubular part.
  • the first area may have an extension along the longitudinal axis, the extension being at least twice the extension of the flange along the longitudinal axis.
  • the downhole system described above may further comprise at least one annular barrier, the annular barrier comprising:
  • the downhole system may further comprise a flow section.
  • the flow section may be an inflow section or a frac port.
  • the downhole system may further comprise a lateral tubular metal structure in connection with the lateral tubular assembly.
  • the lateral tubular metal structure may comprise at least one annular barrier.
  • the lateral tubular assembly may have a lateral axis.
  • an angle may be defined between the longitudinal axis and the lateral axis.
  • the angle may be larger than 100 degrees, preferably larger than 120 degrees.
  • the present invention furthermore relates to a completion method for completing a well comprising the downhole system according to any of the preceding claims, the method comprising the steps of:
  • the completion method may further comprise the step of providing a recess in the second part section around the through-bore.
  • the step of providing the recess may be performed by machining or aciding.
  • the completion method may further comprise the step of arranging a flange of the lateral tubular assembly in the recess.
  • Fig. 1 shows a downhole system 100 for completing a well 1 having a borehole 2 and a top 3 at which top a well head or blowout preventer may be arranged.
  • the downhole system 100 comprises a well tubular metal structure 4 arranged in the borehole 2 with a longitudinal axis 5 along the borehole.
  • the downhole system 100 further comprises a lateral section 6 comprising a tubular part 7 mounted as part of the well tubular metal structure 4.
  • the tubular part 7 has a first part section 8 having a first outer diameter OD 1 and a second part section 9 having a second outer diameter OD 2 being larger than the first outer diameter.
  • the second part section 9 comprises an angled through-bore 10 extending downwards, away from the top 3.
  • the downhole system 100 further comprises a lateral tubular assembly 11 extending at least partly through the through-bore 10 and downwards, away from the top 3 and forming a lateral 12 from the tubular part 7.
  • the moment of resistance and/or the bending moment are/is not decreased in the lateral section and therefore do/does not weaken the lateral section 6 in relation to the remaining part of the well tubular metal structure 4.
  • the lateral tubular assembly 11 has a flange 14 for abutment with a recess 16 in the second part section 9, and the through-bore 10 extends from the recess to an outer face 17 of the second part section.
  • the recess 16 is a circumferential groove and extends along an inner diameter ID t of the tubular part 7.
  • the flange 14 is an annular flange and is received in the recess 16 which is only comprised in part of the tubular part 7 and is thus not circumferential.
  • the lateral tubular assembly 11 has a pipe section 32 having a lateral axis 44 and extending from the flange 14 in an angle ⁇ from the longitudinal axis 5, and thereby forming the lateral 12.
  • the angle ⁇ is thus defined between the longitudinal axis 5 and the lateral axis 44 and is larger than 10 degrees, preferably larger than 120 degrees, and preferably larger than 150 degrees.
  • the lateral tubular assembly 11 has two sealing elements 15 arranged between the flange 14 and the tubular part 7 and around the pipe section 32 in a circumferential groove 33.
  • the tubular part 7 of the lateral section 6 is mounted as part of the well tubular metal structure 4 by means of threads 34.
  • the second part section 9 has a first area 18 comprising the recess 16 and the through-bore 10 and a second area 19 without the recess and the through-bore.
  • the first area 18 has an inner diameter ID R which is larger than an inner diameter ID 2A of the second area 19, and the inner diameter of the tubular part 7 is opposite the lateral tubular assembly 11 equal to or larger than the inner diameter ID 2A of the second area 19.
  • the lateral tubular assembly 11 is arranged flush with the tubular part 7 so that the inner diameter of the tubular part is equal to the inner diameter of the well tubular metal structure 4, and the well tubular metal structure is thus a mono bore.
  • the lateral tubular assembly 11 is held in place by a projection 35A which, when the flange 14 is pressed against the recess 16, is pressed into the tubular part 7 or forms a welded connection between the flange and the recess.
  • the flange 14 is pressed against the recess 16 by means of a tool inserted into the well tubular metal structure 4, and a cone forces the flange radially outwards.
  • the recess 16 is a circumferential recess
  • the first area 18 has a wall thickness t1 which is equal to or larger than a wall thickness t2 of the first part section 8.
  • the second area 19 has an inclining outer face 35, making it easy to run the lateral section 6 into the borehole as the inclined outer face slides along any projections of the wall of the borehole.
  • the second part section 9 has a recess 16 in Fig. 4 which is made after the second part section has been submerged into the well.
  • the first area 18 is partly made of a first material 36 different from a second material 37 of the second area 19.
  • the recess 16 is made in situ downhole, e.g. by machining, such as milling, or by acid.
  • the first material 36 is an acid-dissolvable material, such as aluminium.
  • the material may be a material which is easier to machine than the second material 37.
  • the recess 16 is present in the second part section 9 when submerged into the well.
  • the first area 18 has an extension along the longitudinal axis 5 which is at least twice the length, i.e.
  • the lateral tubular assembly comprises a second part 38 abutting the flange 14 along the circumference of the recess 16 and forming the remaining part of the circumference and thereby fixates the flange in the predetermined position and presses the flange against the recess.
  • the second part may be substituted by a second lateral tubular assembly arranged opposite the first lateral tubular assembly in the same recess, as shown in Fig. 5C .
  • the downhole system 100 further comprises two annular barriers 20.
  • Each annular barrier 20 comprises a tubular metal part 21 for mounting as part of the well tubular metal structure 4, and the tubular metal part has a first expansion opening 22 and an outer face 23.
  • the annular barriers 20 further comprise an expandable metal sleeve 24 surrounding the tubular metal part 21 and having an inner face 25 facing the tubular metal part and an outer face 26 facing a wall 27 of the borehole 2.
  • Each end 28 of the expandable metal sleeve 24 is connected with the tubular metal part 21, thereby defining an annular space 29 between the inner face of the expandable metal sleeve and the tubular metal part.
  • the expandable metal sleeve 24 is configured to expand by allowing pressurised fluid to enter into the annular space 29 through the first expansion opening 22.
  • the lateral section 6 is arranged between the two annular barriers 20.
  • An annular barrier may also be arranged between an intermediate casing 41 and the well tubular metal structure 4, thereby sealing off a first annulus 42.
  • the recess in the lateral section 6 may be formed after the well tubular metal structure 4 comprising the lateral tubular assembly has been submerged into the borehole 2 so that the lateral section does not comprise a recess when submerged, as shown in Fig. 5A .
  • the laterals 12 can be made at a later stage, as shown in the 5B, e.g. by machining or drilling the recess 16 and drilling the through-bore 10 from the recess to the outer face of the tubular part 7 in an angle to the longitudinal axis.
  • the drilling process is continued to make the laterals 12.
  • each lateral tubular assembly 11 is arranged in a recess 16 so that the flange 14 is received in the recess 16, as shown in Fig.
  • a lateral tubular metal structure 31 is run into each lateral 12 and arranged in connection with the lateral tubular assembly 11 of that lateral, as shown in Fig. 5D .
  • Each lateral tubular metal structure 31 comprises two annular barriers 20 in order to isolate a production zone 101.
  • the lateral tubular metal structure 31 comprises a flow section 43, e.g. an inflow section, through which production fluid can flow into the lateral tubular metal structure or a frac port out through which pressurised fluid may flow to provide fractures in the formation of the production zone.
  • the well tubular metal structure 4 After submerging the well tubular metal structure into the borehole 2, the well tubular metal structure 4 is pressurised and the annular barriers 20 are expanded substantially simultaneously.
  • fluid or well fluid 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.
  • gas is meant any kind of gas composition present in a well, completion, or open hole
  • 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.
  • a casing, well tubular metal structure or lateral tubular metal structure is meant any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
  • 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®.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP16169973.1A 2016-05-17 2016-05-17 Bohrlochsystem mit seitlichen abschnitten Withdrawn EP3246513A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16169973.1A EP3246513A1 (de) 2016-05-17 2016-05-17 Bohrlochsystem mit seitlichen abschnitten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16169973.1A EP3246513A1 (de) 2016-05-17 2016-05-17 Bohrlochsystem mit seitlichen abschnitten

Publications (1)

Publication Number Publication Date
EP3246513A1 true EP3246513A1 (de) 2017-11-22

Family

ID=56008553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16169973.1A Withdrawn EP3246513A1 (de) 2016-05-17 2016-05-17 Bohrlochsystem mit seitlichen abschnitten

Country Status (1)

Country Link
EP (1) EP3246513A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5884704A (en) * 1997-02-13 1999-03-23 Halliburton Energy Services, Inc. Methods of completing a subterranean well and associated apparatus
US6158514A (en) * 1998-01-27 2000-12-12 Halliburton Energy Services, Inc. Sealed lateral wellbore junction assembled downhole
US20040055751A1 (en) * 2002-09-24 2004-03-25 Mcglothen Jody R. Alternate path multilateral production/injection
US20070256841A1 (en) * 2006-05-05 2007-11-08 Galloway Gregory G Sidetrack option for monobore casing string

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5884704A (en) * 1997-02-13 1999-03-23 Halliburton Energy Services, Inc. Methods of completing a subterranean well and associated apparatus
US6158514A (en) * 1998-01-27 2000-12-12 Halliburton Energy Services, Inc. Sealed lateral wellbore junction assembled downhole
US20040055751A1 (en) * 2002-09-24 2004-03-25 Mcglothen Jody R. Alternate path multilateral production/injection
US20070256841A1 (en) * 2006-05-05 2007-11-08 Galloway Gregory G Sidetrack option for monobore casing string

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