US20170175485A1 - Downhole system - Google Patents

Downhole system Download PDF

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Publication number
US20170175485A1
US20170175485A1 US15/381,374 US201615381374A US2017175485A1 US 20170175485 A1 US20170175485 A1 US 20170175485A1 US 201615381374 A US201615381374 A US 201615381374A US 2017175485 A1 US2017175485 A1 US 2017175485A1
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US
United States
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.)
Abandoned
Application number
US15/381,374
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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 Oilfield Solutions AG
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
Priority claimed from EP16159369.4A external-priority patent/EP3216975A1/fr
Application filed by Welltec AS filed Critical Welltec AS
Assigned to WELLTEC A/S reassignment WELLTEC A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VASQUES, RICARDO REVES
Publication of US20170175485A1 publication Critical patent/US20170175485A1/en
Assigned to WELLTEC OILFIELD SOLUTIONS AG reassignment WELLTEC OILFIELD SOLUTIONS AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WELLTEC A/S
Assigned to WELLTEC OILFIELD SOLUTIONS AG reassignment WELLTEC OILFIELD SOLUTIONS AG CHANGE OF ADDRESS Assignors: WELLTEC OILFIELD SOLUTIONS AG
Abandoned 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/063—Valve or closure with destructible element, e.g. frangible disc
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/16—Control means therefor being outside the borehole
    • 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
    • E21B2034/007—
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/06—Sleeve valves

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 downhole well tubular structure may have a first end nearest a top of the well and a second end, the second end may be configured to be closed or may be closed when inserting the downhole well tubular structure into the well, and the second end may comprise a second aperture in which a burstable element is arranged for closing the second end.
  • the annular barrier can be expanded in that the downhole well tubular structure is closed, and subsequently the well tubular structure is pressurised to a pressure above the expansion pressure to burst the burstable element so that acid can be circulated down past the acid-soluble material to dissolve the plug.
  • the material may comprise aluminium.
  • the first aperture plugged with a plug of the material may be configured to withstand a first pressure higher than the expansion pressure.
  • the plug may have a body part and a flange, the body part extending into the aperture and the flange abutting an inner face of the well tubular structure.
  • the body part of the plug may have a bore.
  • fluid communication between the inside of the well tubular structure and the annulus can be established by the bore.
  • the body part may have a notch for initiating separation between the body part and the flange.
  • first aperture plugged with the material may be configured to withstand a first pressure being higher than the expansion pressure.
  • the burstable element may be configured to burst at a burst pressure.
  • the first aperture plugged with the material may be configured to withstand a first pressure higher than the burst 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 annular barrier may have only one or no connection parts.
  • 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 as described above comprising
  • Said completion method as described above may, before acidising the acid-soluble material, further comprise pressurising the well tubular structure to a pressure above the expansion pressure to burst a burstable element in a second end of the well tubular structure below the annular barrier.
  • the well tubular structure may comprise a sliding sleeve which is run in hole in an open position, uncovering the first aperture.
  • the completion method may, before acidising the acid-soluble material, further comprise inserting an inner well tubular structure.
  • the completion method may, before acidising the acid-soluble material and after inserting the inner well tubular structure, further comprise 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 acidising the acid-soluble material and after pressurising the inner well tubular structure to the inner expansion pressure, further comprise pressurising the inner well tubular structure to the burst pressure to burst a burst disc.
  • the completion method may, after 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 partially cross-sectional view of a downhole system having a downhole well tubular structure connected with unexpanded annular barriers
  • FIG. 2 shows a partially cross-sectional view of the downhole system of FIG. 1 where the annular barriers are in the expanded position
  • FIG. 3 shows a partially cross-sectional view of another downhole system having an inner well tubular structure arranged within the downhole well tubular structure, before the inner annular barriers connected with the inner well tubular structure are expanded,
  • FIG. 4 shows a partially cross-sectional view of the downhole system of FIG. 1 where the inner annular barriers are in the expanded position
  • FIG. 5 shows a partially cross-sectional view of another downhole system having a tool inserted for operating sliding sleeves covering/uncovering the second apertures in the inner well tubular structure
  • FIG. 6 shows a partially cross-sectional view of yet another downhole system having a dart tool for sequentially operating the sliding sleeves
  • FIG. 7 shows a partially cross-sectional view of yet another downhole system having a burst disc in the second end of the well tubular structure
  • FIG. 8 shows a cross-sectional view of part of the downhole system having a plug and a sliding sleeve in its open position
  • FIG. 8A shows a partial view of FIG. 8 .
  • FIG. 9 shows a cross-sectional view of part of the downhole system of FIG. 8 in which the sliding sleeve has released the flange from the bode part.
  • FIG. 1 shows a downhole system 100 for completing a well 2 , comprising a downhole well tubular structure 1 having a wall la and being configured to be arranged in a borehole 3 of the well.
  • the downhole system 100 comprises a first annular barrier 10 , 10 a 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 , 10 a 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 , 10 a further comprises an expandable metal sleeve 15 surrounding the tubular part 11 and having an inner face 16 facing the outer face 14 of the tubular part, the expandable metal sleeve 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 metal sleeve 15 with the tubular part 11
  • a second connection part 19 is configured to connect a second end 21 of the expandable metal sleeve with the tubular part.
  • An annular space 22 (as shown in FIG. 2 ) is defined between the inner face of the expandable metal sleeve 15 and the outer face 14 of the tubular part 11 .
  • the first annular barrier 10 , 10 a is set and thus expanded by the expandable metal sleeve 15 being expanded by pressurising the annular space 22 with fluid to an expansion pressure by pressurising the fluid inside 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 apertures for the subsequent production of hydrocarbon-containing fluid need to be sealed off to be able to pressurise the well tubular structure.
  • the production apertures in known completions need to be opened by sliding sleeves arranged opposite the apertures. However, this has to be done in a separate run and with the risk of not being able to slide the sleeve and thus not being able to open for production in one or more production zones.
  • well tubular structures are often opened for production by perforating the well tubular structure by means of perforation guns after the expansion of the annular barriers.
  • perforation guns after the expansion of the annular barriers.
  • sliding sleeves are therefore preferred. After sliding the sliding sleeves and thereby uncovering the apertures, the well tubular structure is pressurised with acid to acidise the formation and increase the production contact area and thus increase formation contact.
  • the step or run of intervening the well in order to slide the sliding sleeves can be avoided since the acid provides access through the aperture to the formation.
  • that zone can be shut off by sliding the sliding sleeve to close off the flow through the first aperture opposite that zone.
  • the sliding sleeve 26 is run in hole in its open position.
  • the downhole system 100 further comprises a second annular barrier 10 , 10 b for isolating a first production zone 101 , and the first aperture 23 is arranged between the first and second annular barriers 10 , 10 a , 10 b .
  • the downhole system 100 further comprises a third annular barrier 10 , 10 c for isolating a second production zone 102 between the second and third annular barriers 10 , 10 b , 10 c .
  • 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 inside of the well tubular structure 1 is pressurised so that several annular barriers 10 are set in one pressurising step.
  • the first apertures 23 between the annular barriers 10 a , 10 b , 10 c are plugged by a plug 9 of an acid-soluble material 24 and the plugs 9 are configured to withstand a first pressure being higher than the expansion pressure.
  • the downhole well tubular structure 1 has a first end 6 and a second end 7 as shown in FIG. 7 .
  • the first end 6 is nearest a top of the well and the second end 7 is closed when inserting the downhole well tubular structure 1 into the borehole of the well.
  • the second end 7 comprises a second aperture 52 in which a burstable element 8 is arranged, and the second aperture 52 is also arranged below all the annular barriers 10 .
  • the annular barriers 10 can be expanded in that the downhole well tubular structure 1 is closed by the burstable element 8 , and subsequently the well tubular structure 1 is pressurised to a pressure above the expansion pressure to burst the burstable element 8 so that acid can be circulated down past the acid-soluble material 24 to dissolve the plug 9 .
  • the ball dropped for closing the well tubular metal structure in order to be able to pressurise it has to be drilled out before fluid can be circulated in the well tubular metal structure.
  • the combination of the burstable element 8 in the second aperture 52 in the second end 7 for closing the well tubular structure 1 and plugs 9 of acid-dissoluble material 24 in the first apertures 23 between the annular barriers 10 a , 10 b , 10 c allows the annular barriers to be expanded, and then the burstable element 8 is burst to open the second aperture 52 of the second end 7 , and acid can be circulated to dissolve the plugs 9 , and the well tubular structure 1 is thus open for production without having to intervene the well by tools.
  • a burstable element 8 such as a burst disc, is set to burst at a certain pressure, meaning within a certain pressure range.
  • the present invention thus presents a downhole system 100 in which annular barriers 10 can be expanded and no intervention is needed to open for production subsequently.
  • the plug 9 has a body part 27 and a flange 28 , the body part extending into the aperture and the flange abutting an inner face 44 of a groove 43 in the well tubular structure 1 .
  • the flange 28 has a sealing means 48 in order to seal against the inner face 44 .
  • the body part has a bore 51 closed by the flange 28 .
  • the body part has on its outer face a notch 25 , also shown in FIG. 8A , so that if the plug is not dissolved when acidising, a tool 50 as shown in FIG. 9 can intervene the well and a projectable part 55 of the tool 50 can slide the sleeve and separate by force the flange 28 from the body part 27 .
  • the bore 51 in the body part 27 provides access to the production zone and the production can begin as indicated by arrows.
  • 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 , 30 a and a second inner annular barrier 30 , 30 b .
  • 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 metal 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 metal sleeve 33 with the tubular part 31
  • a second connection part 36 is configured to connect a second end 38 of the expandable metal sleeve with the tubular part.
  • An annular space 39 is formed between the inner face 34 of the expandable metal sleeve 33 and the tubular part 31 .
  • the expandable metal sleeve 33 of the inner annular barriers 30 , 30 a , 30 b 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.
  • the risk of losing mud out of the apertures when running the inner well tubular structure is decreased, while it is ensured that the zones are open for flow once the inner well tubular structure has landed in its position downhole.
  • 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
  • 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 allow the acid to 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 , 30 a , 30 b 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.
  • the first apertures 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.
  • 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.
  • a casing, well tubular structure, downhole well tubular structure, inner well tubular structure, or 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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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Pipe Accessories (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Earth Drilling (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
US15/381,374 2015-12-18 2016-12-16 Downhole system Abandoned US20170175485A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP15201248.0 2015-12-18
EP15201248 2015-12-18
EP16159369.4A EP3216975A1 (fr) 2016-03-09 2016-03-09 Système de forage
EP16159369.4 2016-03-09

Publications (1)

Publication Number Publication Date
US20170175485A1 true US20170175485A1 (en) 2017-06-22

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US15/381,374 Abandoned US20170175485A1 (en) 2015-12-18 2016-12-16 Downhole system

Country Status (9)

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US (1) US20170175485A1 (fr)
EP (1) EP3390772A1 (fr)
CN (1) CN108368735A (fr)
AU (1) AU2016369372A1 (fr)
BR (1) BR112018011001A2 (fr)
CA (1) CA3007151A1 (fr)
MX (1) MX2018006881A (fr)
RU (1) RU2018121740A (fr)
WO (1) WO2017103059A1 (fr)

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CN112901125A (zh) * 2019-12-03 2021-06-04 中国石油天然气股份有限公司 一种套损出岩屑井的二次防砂管柱
US11142987B2 (en) * 2019-09-11 2021-10-12 Welltec Oilfield Solutions Ag Annular barrier system
CN115059404A (zh) * 2022-07-15 2022-09-16 永城煤电控股集团有限公司 一种煤矿防治水探水钻机
US20230003098A1 (en) * 2021-07-01 2023-01-05 Welltec Oilfield Solutions Ag Annular barrier

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US11142987B2 (en) * 2019-09-11 2021-10-12 Welltec Oilfield Solutions Ag Annular barrier system
CN112901125A (zh) * 2019-12-03 2021-06-04 中国石油天然气股份有限公司 一种套损出岩屑井的二次防砂管柱
US20230003098A1 (en) * 2021-07-01 2023-01-05 Welltec Oilfield Solutions Ag Annular barrier
CN115059404A (zh) * 2022-07-15 2022-09-16 永城煤电控股集团有限公司 一种煤矿防治水探水钻机

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CA3007151A1 (fr) 2017-06-22
RU2018121740A (ru) 2020-01-20
WO2017103059A1 (fr) 2017-06-22
AU2016369372A1 (en) 2018-06-21
CN108368735A (zh) 2018-08-03
MX2018006881A (es) 2018-09-06
EP3390772A1 (fr) 2018-10-24
BR112018011001A2 (pt) 2018-12-04

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