EP3249152A1 - Système de fond de trou pour traitement de réparation - Google Patents

Système de fond de trou pour traitement de réparation Download PDF

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Publication number
EP3249152A1
EP3249152A1 EP16171716.0A EP16171716A EP3249152A1 EP 3249152 A1 EP3249152 A1 EP 3249152A1 EP 16171716 A EP16171716 A EP 16171716A EP 3249152 A1 EP3249152 A1 EP 3249152A1
Authority
EP
European Patent Office
Prior art keywords
metal
velocity
production
string
casing
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Withdrawn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
EP16171716.0A
Other languages
German (de)
English (en)
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 EP16171716.0A priority Critical patent/EP3249152A1/fr
Publication of EP3249152A1 publication Critical patent/EP3249152A1/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Withdrawn legal-status Critical Current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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/122—Gas lift
    • E21B43/123—Gas lift valves
    • 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
    • E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
    • E21B33/1243—Units with longitudinally-spaced plugs for isolating the intermediate space with inflatable sleeves
    • 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
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like

Definitions

  • the present invention relates to a downhole system for remedial treatment of a well in a hydro-carbon reservoir having insufficient flow velocity, thereby accumulating water in the toe of the well. Furthermore, the invention relates to a downhole gas lift method for remedial treatment of a well in a hydro-carbon reservoir having insufficient flow velocity.
  • Some hydro-carbon producing wells have the problem that the flow velocity of the produced fluid is not high enough, which allows the fluid to undergo phase transformation and form water droplets which are disposed on the inner face of the production metal casing and run along the inner face and accumulate in the bottom or the toe of the well, slowly destroying the well until it stops producing.
  • a downhole system for remedial treatment of a well in a hydro-carbon reservoir having insufficient flow velocity, thereby accumulating water in the toe of the well comprising:
  • the velocity metal string may comprise gas lift valves arranged opposite the first annulus section or the second annulus section.
  • gas lift valves may be arranged above the first annular barrier.
  • the velocity metal string may extend into the well from the top of the well.
  • the velocity metal string may be coiled tubing.
  • the downhole system may further comprise an intermediate casing arranged at the top of the well, surrounding the production metal casing, and a main barrier arranged between the intermediate casing and the production metal casing, defining an intermediate annulus, the velocity metal string comprising a second annular barrier, the first annular barrier being arranged below the main barrier and the second annular barrier being arranged above the main barrier, enclosing the first annulus section, and the production metal casing having an aperture providing fluid communication between the intermediate annulus and the first annulus section.
  • the downhole system may further comprise a pump device configured to suck well fluid up through the velocity metal string.
  • the downhole system may further comprise a downhole safety valve arranged in the production metal casing above the first annular barrier
  • the downhole system may further comprise a second velocity metal string arranged above the downhole safety valve.
  • the second velocity metal string may comprise at least one annular barrier.
  • the velocity metal string may comprise gas lift valves arranged opposite the first annulus section being closest to the top of well.
  • the velocity metal string may have a first end and a second end, the second end being arranged opposite the first production zone.
  • the velocity metal string may reduce the flow area by more than 50% of the flow area of the production metal casing.
  • the velocity metal string may be configured to be temporarily positioned in the well.
  • the velocity metal string may comprise a plurality of annular barriers.
  • annular barrier(s) may be configured to suspend the velocity metal string in the production metal casing.
  • a first expansion opening may be arranged in the annular barrier, providing access to the annular space so that the expandable metal sleeve is configured to expand when pressurised fluid is injected into the annular space through the first expansion opening.
  • tubular metal part may have the first expansion opening.
  • a flow line may be connected to the first expansion opening of the annular barrier, the flow line being arranged outside the velocity metal string.
  • the flow line may extend from the top of the well along the first annulus section to the first expansion opening.
  • the annular space may comprise at least one thermally decomposable compound, which compound is thermally decomposable below a temperature of 400°C and is adapted to generate gas or super-critical fluid upon decomposition.
  • the compound may comprise nitrogen.
  • the compound may be selected from a group consisting of: ammonium dichromate, ammonium nitrate, ammonium nitrite, barium azide, sodium nitrate or a combination thereof.
  • the compound may decompose at temperatures above 100°C, preferably above 180°C.
  • the annular space may be pre-pressurised to a pressure above 5 bar, preferably above 50 bar, more preferably above 100 bar, and even more preferably above 250 bar.
  • the compound may be present in the form of a powder, a powder dispersed in a liquid or a powder dissolved in a liquid.
  • the production metal casing may comprise one or more casing annular barriers each having an expandable metal sleeve surrounding the tubular metal part and being mounted as part of production metal casing and having an inner face facing the tubular metal part and an outer face facing a wall of a borehole.
  • the downhole system may further comprise a gas lift pump configured to pressurise the first annulus section to provide gas lift.
  • the well may have a liquid level.
  • the second end of the velocity metal string may be arranged below the liquid level.
  • the present invention furthermore relates to a downhole gas lift method for remedial treatment of a well in a hydro-carbon reservoir having insufficient flow velocity, thereby accumulating water in the toe of the well, the method comprising:
  • the method may further comprise the step of pressurising the first annulus section with gas.
  • the method may further comprise the step of allowing the gas to flow into the velocity metal string through the gas lift valves.
  • Fig. 1 shows a downhole system 100 for remedial treatment of a well 2 having insufficient flow velocity and thereby accumulating water, illustrated by a liquid level 47, in a toe or bottom of the well 2 in a hydro-carbon reservoir 200.
  • the downhole system 100 comprises a production metal casing 3 having a first inner diameter ID 1 and a first production zone 101.
  • the downhole system 100 further comprises a velocity metal string 4 having a second inner diameter ID 2 smaller than the first inner diameter and arranged inside the production metal casing 3 to reduce the flow area FA from the flow area FA 1 of the production metal casing 3 having no velocity metal string to the flow area FA 2 of the well 2 having the velocity metal string 4 inside the production metal casing 3.
  • the velocity metal string 4 increases the flow velocity of the fluid flowing in the well 2, which prevents the fluid from undergoing phase transformation, meaning that water droplets are no longer able to generate and deposit on the inner face of the production metal casing 3 and accumulate in the bottom or toe of the well 2.
  • the velocity metal string 4 comprises a first annular barrier 10 having a tubular metal part 11 mounted as part of the velocity metal string.
  • the first annular barrier 10 comprises an expandable metal sleeve 12 surrounding the tubular metal part 11 and having an inner face 14 facing the tubular metal part and an outer face 15 facing a wall 16 of the production metal casing 3.
  • Each end 17 of the expandable metal sleeve 12 is connected with the tubular metal part 11, defining an annular space 19 between the inner face 14 of the expandable metal sleeve and the tubular metal part.
  • the expandable metal sleeve 12 is expanded to abut the production metal casing 3, dividing an annulus 20 between the production metal casing and the velocity metal string 4 into a first annulus section 21 and a second annulus section 22.
  • the first annulus section 21 is arranged closer to a top 30 of the well 2 than the second annulus section 22. As the flow velocity of the fluid increases, the water accumulated at the bottom will to some extent be mixed with well fluid and water droplets will be carried with the high flow fluid, meaning that some of the accumulated water will be removed from the bottom of the well.
  • the velocity metal string 4 extends into the well 2 from the top 30 of the well, and the velocity metal string is in Fig. 1 shown as coiled tubing around which the first annular barrier 10, 10a is provided.
  • the velocity metal string 4 is mounted from a plurality of tubing sections to form the string and is suspended from the production metal casing 3 by means of the first annular barrier 10 so that the velocity metal string 4 does not have to be hung-off in larger equipment at the top 30 of the well 2.
  • the velocity metal string 4 comprises gas lift valves 23, 23a-h arranged opposite the first annulus section 21 above the annular barrier 10.
  • the first annulus section 21 may then be pressurised with gas flowing first in through a first gas lift valve 23a, then a second gas lift valve 23b, and subsequently, the first gas lift valve 23a closes.
  • the pressurisation continues and the gas also flows into a third gas lift valve 23c, and as the gas continues downwards and displaces the fluid in the first annulus section 21, the second gas lift valve 23b closes.
  • the pressurisation continues until gas in turn has also entered a fourth gas lift valve 23d, a fifth gas lift valve 23e, a sixth gas lift valve 23f, a seventh gas lift valve 23g and an eighth gas lift valve 23h, thereby lifting the column of well fluid in the velocity metal string 4 and increasing the flow velocity even further.
  • the velocity metal string 4 has a first end 41 and a second end 42, and the second end is arranged opposite the first production zone 101.
  • the velocity metal string 4 comprises the first annular barrier 10, 10a and a second annular barrier 10, 10b which together enclose the first annulus section 21.
  • the second annular barrier 10, 10b thus divides the annulus 20 into the second annulus section 22 and a third annulus section 33.
  • the velocity metal string comprises gas lift valves 23 arranged opposite the first annulus section 21 which, when pressurised with gas, flow into the fluid in the velocity metal string 4 and increase the flow velocity of the fluid.
  • the downhole system 100 further comprises an intermediate casing 24 arranged at the top of the well and surrounding the production metal casing 3.
  • the downhole system 100 further comprises a main barrier 25 arranged between the intermediate casing 24 and the production metal casing 3, defining an intermediate annulus 26.
  • the velocity metal string 4 comprises a second annular barrier 10, 10b, and the first annular barrier 10, 10a is arranged above the main barrier 25 when seen along the longitudinal axis 27 of the production metal casing 3, and the second annular barrier is arranged below the main barrier 25, enclosing the first annulus section 21.
  • the production metal casing 3 has an aperture 28 providing fluid communication between the intermediate annulus 26 and the first annulus section 21.
  • the velocity metal string 4 comprises gas lift valves 23, 23a-g arranged opposite the first annulus section 21 which, when pressurised with gas, flow into the fluid in the velocity metal string 4 and increase the flow velocity of the fluid.
  • gas lift valves 23, 23a-g shown in Fig. 3 , and the flow velocity of the fluid is further increased when needed.
  • the downhole system 100 further comprises a downhole safety valve 29 arranged in the production metal casing 3 above the first annular barrier 10a.
  • a downhole safety valve 29 can only be removed by pulling the production metal casing 3 out of the well 2, which is not desired as such an operation is very expensive, and furthermore, the production metal casing without the valve needs to be inserted again before the velocity metal string 4 is inserted. Therefore, the downhole system 100 comprises a second velocity metal string 4b arranged above the downhole safety valve 29.
  • the second velocity metal string 4b comprises an annular barrier 10c for connecting the second velocity metal string 4b to the production metal casing 3.
  • the downhole system 100 comprises a pump device configured to suck well fluid up through the velocity metal string.
  • the velocity metal string reduces the flow area by more than 50% of the flow area of the production metal casing.
  • a first expansion opening 51 of the annular barrier 10 shown in Fig. 2 provides access to the annular space 19 so that the expandable metal sleeve is configured to expand when pressurised fluid is injected into the annular space through the first expansion opening.
  • the fluid for expanding the annular barrier 10 is provided by means of a flow line 52 from surface which is arranged outside the velocity metal string 4.
  • the tubular metal part 11 of the annular barrier 10 comprises the first expansion opening 51 so that the velocity metal string 4 is pressurised to expand the expandable metal sleeve 12.
  • Another way of expanding the expandable metal sleeve is by way of a compound arranged in the annular space 19, which compound is thermally decomposable below a temperature of 400°C and is adapted to generate gas or super-critical fluid upon decomposition and thereby expand the expandable metal sleeve 12.
  • the compound comprises nitrogen and is selected from a group consisting of: ammonium dichromate, ammonium nitrate, ammonium nitrite, barium azide, sodium nitrate or a combination thereof.
  • the compound is present in the form of a powder, a powder dispersed in a liquid or a powder dissolved in a liquid, and the compound decomposes at temperatures above 100°C, preferably above 180°C.
  • the annular barriers 10 may also be expanded by inserting a tool isolating a zone opposite the expansion opening and pressurising the isolated zone and expanding the expandable metal sleeve 12.
  • the annular space 19 is pre-pressurised to a pressure above 5 bar, preferably above 50 bar, more preferably above 100 bar, and even more preferably above 250 bar.
  • the production metal casing 3 comprises two casing annular barriers 40, each having an expandable metal sleeve 12 surrounding the tubular metal part 42 being mounted as part of production metal casing 3 and having an inner face 43 facing the tubular metal part and an outer face 44 facing a wall 45 of the borehole 34.
  • the downhole system 100 further comprises a gas lift pump 46 configured to pressurise the first annulus section 21 to provide gas lift.
  • Downhole gas lift is provided for remedial treatment of a well 2 in a hydro-carbon reservoir 200 having insufficient flow velocity and thereby accumulating water in the toe of the well.
  • the gas lift is provided by inserting a velocity metal string 4 of the downhole system 100 and then expanding the annular barrier 10 so that the expandable metal sleeve 12 abuts the production metal casing 3, dividing an annulus 20 between the production metal casing and the velocity metal string into a first annulus section 21 and a second annulus section 22, the first annulus section being arranged closer to the top 30 of the well 2 than the second annulus section.
  • gas can be provided down the first annulus section 21, allowing the gas to flow into the velocity metal string 4 through gas lift valves 23, 23a-h, as shown in Fig. 2 .
  • 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.
  • casing or production metal casing 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)
EP16171716.0A 2016-05-27 2016-05-27 Système de fond de trou pour traitement de réparation Withdrawn EP3249152A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16171716.0A EP3249152A1 (fr) 2016-05-27 2016-05-27 Système de fond de trou pour traitement de réparation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16171716.0A EP3249152A1 (fr) 2016-05-27 2016-05-27 Système de fond de trou pour traitement de réparation

Publications (1)

Publication Number Publication Date
EP3249152A1 true EP3249152A1 (fr) 2017-11-29

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EP16171716.0A Withdrawn EP3249152A1 (fr) 2016-05-27 2016-05-27 Système de fond de trou pour traitement de réparation

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052124A2 (fr) * 2000-12-22 2002-07-04 E2 Tech Limited Procede et appareil
US20100186968A1 (en) * 2005-06-08 2010-07-29 Hill Thomas G Method and Apparatus for Continuously Injecting Fluid in a Wellbore While Maintaining Safety Valve Operation
EP2599956A1 (fr) * 2011-11-30 2013-06-05 Welltec A/S Système de barrière annulaire avec circuits d'écoulement
US20130199794A1 (en) * 2012-02-08 2013-08-08 Weatherford/Lamb, Inc. Gas Lift System Having Expandable Velocity String
EP2728111A1 (fr) * 2012-10-31 2014-05-07 Welltec A/S Procédé de test de barrière à pression
US20140124199A1 (en) * 2011-06-10 2014-05-08 Meta Downhole Limited Tubular Assembly and Method of Deploying A Downhole Device Using A Tubular Assembly
EP3020912A1 (fr) * 2014-11-12 2016-05-18 Welltec A/S Barrière annulaire avec mécanisme de fermeture

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052124A2 (fr) * 2000-12-22 2002-07-04 E2 Tech Limited Procede et appareil
US20100186968A1 (en) * 2005-06-08 2010-07-29 Hill Thomas G Method and Apparatus for Continuously Injecting Fluid in a Wellbore While Maintaining Safety Valve Operation
US20140124199A1 (en) * 2011-06-10 2014-05-08 Meta Downhole Limited Tubular Assembly and Method of Deploying A Downhole Device Using A Tubular Assembly
EP2599956A1 (fr) * 2011-11-30 2013-06-05 Welltec A/S Système de barrière annulaire avec circuits d'écoulement
US20130199794A1 (en) * 2012-02-08 2013-08-08 Weatherford/Lamb, Inc. Gas Lift System Having Expandable Velocity String
EP2728111A1 (fr) * 2012-10-31 2014-05-07 Welltec A/S Procédé de test de barrière à pression
EP3020912A1 (fr) * 2014-11-12 2016-05-18 Welltec A/S Barrière annulaire avec mécanisme de fermeture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LARRY S. ADAMS: "COILED TUBING VELOCITY STRING SET AT RECORD 20,500 FT - Oil & Gas Journal", 13 April 1992 (1992-04-13), XP055295048, Retrieved from the Internet <URL:http://www.ogj.com/articles/print/volume-90/issue-15/in-this-issue/production/coiled-tubing-velocity-string-set-at-record-20500-ft.html> [retrieved on 20160811] *

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