EP3216975A1 - Système de forage - Google Patents

Système de forage Download PDF

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Publication number
EP3216975A1
EP3216975A1 EP16159369.4A EP16159369A EP3216975A1 EP 3216975 A1 EP3216975 A1 EP 3216975A1 EP 16159369 A EP16159369 A EP 16159369A EP 3216975 A1 EP3216975 A1 EP 3216975A1
Authority
EP
European Patent Office
Prior art keywords
tubular structure
well tubular
downhole
aperture
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Withdrawn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
EP16159369.4A
Other languages
German (de)
English (en)
Inventor
Ricardo Reves Vasques
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 EP16159369.4A priority Critical patent/EP3216975A1/fr
Priority to BR112018011001A priority patent/BR112018011001A2/pt
Priority to MX2018006881A priority patent/MX2018006881A/es
Priority to CN201680072964.4A priority patent/CN108368735A/zh
Priority to AU2016369372A priority patent/AU2016369372A1/en
Priority to EP16823211.4A priority patent/EP3390772A1/fr
Priority to CA3007151A priority patent/CA3007151A1/fr
Priority to US15/381,374 priority patent/US20170175485A1/en
Priority to PCT/EP2016/081370 priority patent/WO2017103059A1/fr
Priority to RU2018121740A priority patent/RU2018121740A/ru
Publication of EP3216975A1 publication Critical patent/EP3216975A1/fr
Withdrawn legal-status Critical Current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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/127—Packers; Plugs with inflatable sleeve
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production

Definitions

  • the present invention relates to a downhole system for completing a well, comprising a downhole well tubular structure having a wall and being configured to be arranged in a borehole of the well; a first annular barrier for being expanded in an annulus between the downhole well tubular structure and a wall of the borehole; and a first aperture in the wall of the downhole well tubular structure. Furthermore, the invention relates to a completion method for completing a downhole system.
  • Hydrocarbon-containing wells may be completed in very different manners and with very different designs, and the design used depends on the geological structure and composition of the formation in which the well is formed. In sub-salt fields that experience high losses during drilling and completion, it is very important that the well tubular structure is closed off until the annular barriers are expanded so that a zone experiencing a high pressure loss can be closed off after opening for production from that zone.
  • a downhole system for completing a well comprising:
  • the material may comprise aluminium.
  • the aperture plugged with the material may be configured to withstand a first pressure being higher than the expansion pressure.
  • the downhole system may further comprise a second annular barrier, and the aperture may be arranged between the first annular barrier and the second annular barrier.
  • the downhole system may further comprise a sliding sleeve arranged opposite the aperture and having a first initial position uncovering the aperture.
  • the downhole system may further comprise:
  • a burst disc may be arranged in the second aperture and be configured to burst at a burst pressure higher than the inner expansion pressure.
  • the inner well tubular structure may comprise a sliding sleeve arranged opposite the second aperture.
  • the downhole well tubular structure may comprise other annular barriers.
  • the inner well tubular structure may comprise other inner annular barriers.
  • the downhole well tubular structure may comprise other first apertures arranged between two annular barriers.
  • the inner well tubular structure may comprise other second apertures arranged between two inner annular barriers.
  • the downhole system may further comprise a tool configured to close and/or open the sliding sleeves.
  • the tool may be arranged at the bottom of the well or be inserted when needed.
  • the downhole system may further comprise a dart tool having projecting elements for engaging a groove in the sliding sleeve and an inflatable element.
  • the present invention furthermore relates to a completion method for completing a downhole system according to any of the preceding claims, comprising the steps of:
  • the completion method may, before the step of acidising the acid-soluble material, further comprise the step of inserting an inner well tubular structure.
  • the completion method may, before the step of acidising the acid-soluble material and after the step of inserting the inner well tubular structure, further comprise the step of pressurising the inner well tubular structure to the inner expansion pressure to expand inner annular barriers connected with the inner well tubular structure.
  • the completion method may, before the step of acidising the acid-soluble material and after the step of pressurising the inner well tubular structure to the inner expansion pressure, further comprise the step pressurising the inner well tubular structure to the burst pressure to burst a burst disc.
  • the completion method may, after the step of pressurising the inner well tubular structure to the burst pressure to burst the burst disc, let acid through a second aperture into a second annulus between the inner well tubular structure, the downhole well tubular structure and the inner annular barriers to acidise the acid-soluble material.
  • Fig. 1 shows a downhole system 100 for completing a well 2, comprising a downhole well tubular structure 1 having a wall 1a and being configured to be arranged in a borehole 3 of the well.
  • the downhole system 100 comprises a first annular barrier 10, 10a configured to be expanded in an annulus 4 between the downhole well tubular structure 1 and a wall 5 of the borehole 3, as shown in Fig. 2 .
  • the first annular barrier 10, 10a comprises a tubular part 11 configured to be mounted as part of the downhole well tubular structure 1.
  • the tubular part 11 has a first expansion opening 12 and an outer face 14.
  • the first annular barrier 10, 10a further comprises an expandable sleeve 15 surrounding the tubular part 11 and having an inner face 16 facing the outer face 14 of the tubular part, and further having an outer face 17 facing the wall of the borehole 3.
  • a first connection part 18 is configured to connect a first end 20 of the expandable sleeve 15 with the tubular part 11, and a second connection part 19 is configured to connect a second end 21 of the expandable sleeve with the tubular part.
  • An annular space 22 is defined between the inner face of the expandable sleeve 15 and the outer face 14 of the tubular part 11.
  • the first annular barrier 10, 10a is set and thus expanded by the expandable sleeve 15 being expanded by pressurising the annular space 22 to an expansion pressure by pressurising the tubular part 11 opposite the first expansion opening.
  • the wall of the downhole well tubular structure 1 has a first aperture 23 which is at least partly plugged with an acid-soluble material 24 so that the aperture is configured to withstand a first pressure being higher than the expansion pressure.
  • the material 24 mainly comprises aluminium so that acid can dissolve the material and clear the aperture 23.
  • the well tubular structure is pressurised with acid to acidise the formation and increase the production contact area and thus increase formation contact.
  • the aperture may also comprise a burst disc configured to burst at a burst pressure higher than the expansion pressure in order to expand the annular barrier 10.
  • the downhole system 100 further comprises a second annular barrier 10, 10b for isolating a first production zone 101, and the first aperture 23 is arranged between the first and second annular barriers 10, 10a, 10b.
  • the downhole system 100 further comprises a third annular barrier 10, 10c for isolating a second production zone 102 between the second and third annular barriers 10, 10b, 10c.
  • the downhole well tubular structure 1 is closed at the bottom by a ball 46 fitting into a ball seat 47. In this way, the entire well tubular structure 1 can be pressurised from its top to expand the annular barriers 10.
  • the well tubular structure 1 may also be closed, e.g. by a plug or the like.
  • the downhole system 100 further comprises a sliding sleeve 26 arranged opposite the first aperture 23 and having a first initial position uncovering the first aperture so that a second run is not necessary to open the first apertures.
  • the sliding sleeves 26 can be closed later, e.g. if one of the production zones starts producing water, that zone can be closed by sliding the sliding sleeve arranged opposite that aperture through which the water flows from that zone.
  • the downhole system 100 further comprises an inner well tubular structure 29 arranged inside the downhole well tubular structure 1.
  • the inner well tubular structure 29 comprises a first inner annular barrier 30, 30a and a second inner annular barrier 30, 30b.
  • Each inner annular barrier 30 comprises a tubular part 31 for mounting as part of the inner well tubular structure 29.
  • the tubular part 31 has an inner expansion opening 32 through which pressurised fluid enters to expand an expandable sleeve 33 surrounding the tubular part and having an inner face 34 facing the tubular part and an outer face facing the wall of the downhole well tubular structure 1.
  • a first connection part 35 is configured to connect a first end 37 of the expandable sleeve 33 with the tubular part 31, and a second connection part 36 is configured to connect a second end 38 of the expandable sleeve with the tubular part.
  • An annular space 39 is formed between the inner face 34 of the expandable sleeve 33 and the tubular part 31.
  • the expandable sleeve 33 of the inner annular barriers 30, 30a, 30b is expanded by pressurising the annular space to an inner expansion pressure by pressurising the tubular part 31 and letting the pressurised fluid in through the inner expansion opening 32.
  • the wall of the inner well tubular structure 29 comprises a second aperture 40 through which acid is let into a second annulus 45 between the inner well tubular structure 29, the downhole well tubular structure 1 and the inner annular barriers 30 to acidise the acid-soluble material in the first aperture 23 in the wall of the downhole well tubular structure 1.
  • the completion is double-skinned and the production fluid flows from the first production zone 101 in through the first aperture 23, into the second annulus 45 and further into the inner well tubular structure 29 through the second aperture 40.
  • the inner well tubular structure 29 comprises a key mechanism 49 at its toe at the bottom of the inner well tubular structure 29.
  • the purpose of this is that when the inner well tubular structure 29 is recovered for recompletion or abandonment, the sliding sleeves of the valves of the downhole well tubular structure 1 are closed as the inner well tubular structure is retrieved to surface.
  • the key mechanism 49 slides along the downhole well tubular structure 1 and engages a profile of the sliding sleeves 26 and slides the sliding sleeves into their closed position one by one as the inner well tubular structure 29 is pulled out of the well. This prevents commingling of the zones or significant losses during work-over operations.
  • the inner well tubular structure 29 may be an intelligent completion with surface control of the inner valves, e.g. sliding sleeves 26 or other types of valves, for controlling the flow from the multiple zones.
  • surface control of the inner valves e.g. sliding sleeves 26 or other types of valves, for controlling the flow from the multiple zones.
  • the second apertures 40 need to be sealed off, e.g. closed by a sliding sleeve 42 covering the second aperture 40.
  • a sliding sleeve 42 covering the second aperture 40.
  • an additional run is necessary.
  • a burst disc 41 is arranged in the second aperture 40 and configured to burst at a burst pressure higher than the inner expansion pressure, the inner well tubular structure just needs to be pressurised to the burst pressure to open the second apertures.
  • the acid fluid When supplying acid down the inner well tubular structure, the acid fluid can be pressurised to a pressure above the burst pressure and can thus burst the burst disc just before the acid is fed to the second annulus to dissolve the material 24 in the first aperture 23.
  • the step of acidising entails bursting the burst disc opening the second aperture, acidising the acid-soluble material in the first aperture 23, and acidising the formation to increase formation contact, all in one run without intervening the well.
  • the downhole well tubular structure 1 may be connected with other annular barriers 10, and the inner well tubular structure may be connected with other inner annular barriers 30.
  • the downhole well tubular structure 1 may comprise other first apertures 23 arranged between two adjacent annular barriers 10, and the inner well tubular structure may comprise other second apertures 40 arranged between two adjacent inner annular barriers 30.
  • the downhole system 100 may in this way have a plurality of production zones other than the first and the second production zones.
  • the downhole system 100 further comprises a tool 50 configured to close the sliding sleeves 42 and reopen them when needed.
  • the tool 50 comprises a flexible element (not shown) which is forced radially outwards, but when moving along the inner face 34 of the inner well tubular structure, it is forced to retract, and when being opposite the groove 62 of the sliding sleeve 42, the flexible element is allowed to project radially outwards and engage the groove 62, and as the tool 50 continues to move in one direction, the sliding sleeve 42 is moved to either open or close the aperture 40.
  • the tool 50 may be arranged in the bottom of the well 2 and be engaged by a drill pipe inserted in the inner or downhole well tubular structure when the sliding sleeves 42 need to be closed, e.g. before the inner well tubular structure is retracted for repair or replacement.
  • the downhole system 100 further comprises a dart tool 60 having projecting elements 61 configured to engage a groove 62 in the sliding sleeve 42 and an inflatable element 63.
  • the dart tool 60 can be used if the inner well tubular structure is inserted with the sliding sleeves 42 in a closed position, covering the second aperture 40, and the production zones need to be opened and fractured sequentially. This is e.g. the case if only one zone is opened and treated with acid, and when that production zone produces water, the zone is closed and another production zone is opened and treated with acid.
  • the dart tool 60 is then inserted into the inner well tubular structure, and when detecting the sliding sleeve 42 to be operated, the projecting elements 61 engage the groove 62 of the sliding sleeve 42 and the inflatable element 63 is inflated. Upon further pressurisation of the fluid above the inflatable element 63, the dart tool 60 is moved downwards and the sliding sleeve 42 is forced open, and the acid is let into the second annulus 45, the acid-soluble material 24 is dissolved and the acid enters the first aperture 23 and the formation.
  • the dart tool 60 may be used to open and treat several zones with acid. When this is done, the sliding sleeves 42 are self-closing.
  • the well 2 is completed by inserting the downhole well tubular structure 1 into the borehole 3, by pressurising the downhole well tubular structure to expand the annular barriers 10, and by subsequently acidising the acid-soluble material 24 to clear the first aperture 23 and allowing the acid the enter the first aperture to acidise the formation as well.
  • an inner well tubular structure is inserted after the annular barriers 10 connected with the downhole well tubular structure 1 are expanded and before the acid treatment.
  • the inner well tubular structure is pressurised to the inner expansion pressure to expand the inner annular barriers 30, 30a, 30b and thus isolate the second annulus 45 between the downhole well tubular structure 1 and the inner well tubular structure into several second annuluses 45.
  • the inner well tubular structure is pressurised to the burst pressure to burst the burst discs 41 and provide access to the second annulus 45.
  • the burst discs 41 may be burst one at a time and thus be rated at different burst pressures so that e.g. the burst disc arranged furthest away from the top of the well is rated to the lowest burst pressure to ensure that it is burst before bursting the next burst disc closer to the top of the well. In this way, it is ensured that all burst discs 41 are burst to prevent that once the first burst disc arranged closest to the top is burst, all fluid is lost in that zone so the other burst discs are not burst.
  • a flow control valve may be arranged in one of the apertures in the well tubular structures to control flow in or out of the well tubular structures.
  • 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.
  • production casing 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)
EP16159369.4A 2015-12-18 2016-03-09 Système de forage Withdrawn EP3216975A1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP16159369.4A EP3216975A1 (fr) 2016-03-09 2016-03-09 Système de forage
BR112018011001A BR112018011001A2 (pt) 2015-12-18 2016-12-16 sistema de fundo de poço
MX2018006881A MX2018006881A (es) 2015-12-18 2016-12-16 Sistema de fondo de perforacion.
CN201680072964.4A CN108368735A (zh) 2015-12-18 2016-12-16 井下系统
AU2016369372A AU2016369372A1 (en) 2015-12-18 2016-12-16 Downhole system
EP16823211.4A EP3390772A1 (fr) 2015-12-18 2016-12-16 Système de fond de trou
CA3007151A CA3007151A1 (fr) 2015-12-18 2016-12-16 Systeme de fond de trou
US15/381,374 US20170175485A1 (en) 2015-12-18 2016-12-16 Downhole system
PCT/EP2016/081370 WO2017103059A1 (fr) 2015-12-18 2016-12-16 Système de fond de trou
RU2018121740A RU2018121740A (ru) 2015-12-18 2016-12-16 Скважинная система

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16159369.4A EP3216975A1 (fr) 2016-03-09 2016-03-09 Système de forage

Publications (1)

Publication Number Publication Date
EP3216975A1 true EP3216975A1 (fr) 2017-09-13

Family

ID=55527338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16159369.4A Withdrawn EP3216975A1 (fr) 2015-12-18 2016-03-09 Système de forage

Country Status (1)

Country Link
EP (1) EP3216975A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012011994A1 (fr) * 2010-07-22 2012-01-26 Exxonmobil Upstrem Research Company Procédé et système de stimulation d'un puits multi-zones
EP2728108A1 (fr) * 2012-10-31 2014-05-07 Welltec A/S Système de fond de trou et dispositif de chute
GB2509085A (en) * 2012-12-19 2014-06-25 Maersk Olie & Gas Treating a formation by displacing wellbore fluid and delivering treatment fluid
WO2014207085A1 (fr) * 2013-06-27 2014-12-31 Welltec A/S Outil de fixation de pièce

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012011994A1 (fr) * 2010-07-22 2012-01-26 Exxonmobil Upstrem Research Company Procédé et système de stimulation d'un puits multi-zones
EP2728108A1 (fr) * 2012-10-31 2014-05-07 Welltec A/S Système de fond de trou et dispositif de chute
GB2509085A (en) * 2012-12-19 2014-06-25 Maersk Olie & Gas Treating a formation by displacing wellbore fluid and delivering treatment fluid
WO2014207085A1 (fr) * 2013-06-27 2014-12-31 Welltec A/S Outil de fixation de pièce

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