EP2813669A1 - Abschlussverfahren und Bohrlochsystem - Google Patents

Abschlussverfahren und Bohrlochsystem Download PDF

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Publication number
EP2813669A1
EP2813669A1 EP13172062.5A EP13172062A EP2813669A1 EP 2813669 A1 EP2813669 A1 EP 2813669A1 EP 13172062 A EP13172062 A EP 13172062A EP 2813669 A1 EP2813669 A1 EP 2813669A1
Authority
EP
European Patent Office
Prior art keywords
casing
well
valve
fluid
completion method
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Withdrawn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
EP13172062.5A
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English (en)
French (fr)
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 EP13172062.5A priority Critical patent/EP2813669A1/de
Priority to PCT/EP2014/062366 priority patent/WO2014198887A1/en
Publication of EP2813669A1 publication Critical patent/EP2813669A1/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Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the present invention relates to a completion method for implementing a casing in a well containing liquid and having a top. Furthermore, the invention relates to a downhole system for carrying out the completion method.
  • the casing When completing a cased well, the casing is assembled at the rig and lowered into the borehole. Along the vertical part of the well, the force of gravity facilitates the lowering process, but when the casing enters the more horizontal part of the borehole, much more force is required to submerge the casing, and at some point, the casing cannot be pushed any further. Therefore, the length of cased wells is limited to the point where the casing by conventional methods cannot be submerged any further.
  • the completion method may further comprise the step of arranging the casing in a final position.
  • the completion method may further comprise the step of filling the casing with fluid and pressurising the fluid in order for the fluid to enter through the valve at the end of the casing to flush or clean the well.
  • the completion method may further comprise the step of dropping a ball into the fluid in the casing and catching the ball in a slidable ball seat arranged at the first end of the casing, closer to the top of the well than the valve.
  • the completion method may further comprise the step of pressurising the fluid until the slidable ball seat slides into a position where the seat covers the valve, thereby closing the first end of the casing.
  • the casing may further comprise annular barriers having tubular parts mounted as part of the casing and an expandable sleeve surrounding the tubular part with an opening through which fluid enters to expand the sleeve.
  • the completion method may further comprise the step of pressurising the fluid in the casing and expanding the expandable sleeves of the annular barriers.
  • the completion method may further comprise the step of connecting the casing with a drill pipe/string before lowering the casing into the well.
  • the fluid entering through the valve may be a cleaning fluid.
  • the present invention furthermore relates to a downhole system for carrying out the completion method for implementing a casing in a well containing liquid and having a top according to any of the preceding claims, the system comprising:
  • the downhole system may further comprise a ball seat at the first end of the casing, the ball seat being arranged closer to the top of the well than the valve.
  • the ball seat may be slidable from a first position to a second position, in which second position the ball seat closes an inlet of the valve.
  • valve may comprise a burst disc for closing the valve when the disc is burst.
  • the downhole system may further comprise a plurality of annular barriers having tubular parts mounted as part of the casing, and an expandable sleeve surrounding the tubular part with an opening through which fluid enters in order to expand the sleeve.
  • the downhole system may further comprise inflow control valves.
  • the expandable sleeve may be made of metal and may be connected with the tubular part by means of connection parts, and the valve may be arranged in a part of the casing wall being parallel with an axial extension of the casing so that the ball seat having a tubular wall part is able to cover an inlet of the valve when being slided.
  • system may further comprise sliding sleeves arranged opposite the inflow control valves.
  • system may further comprise frac ports for ejecting fluid out of the casing into the formation to fracture the formation.
  • system may further comprise a pump for pressurising the fluid.
  • Fig. 1 shows a downhole system 1 comprising a casing 2 arranged in a well 3 containing liquid 4.
  • the well has a top 5 connected with a completion rig.
  • the casing has a first end 8 arranged opposite the top end of the well.
  • the casing has a casing wall 7 defining an inner space 19, and a one-way valve 6 is arranged in the wall at the first end in such a way that liquid in the annulus 28 is prevented from entering the inner space.
  • the casing is filled with gas 9, such as air, which may be pressurised by means of a pump 26 fluidly connected with a second end 27 of the casing near the top.
  • the gas 9 When introducing the first end 8 of the casing into a horizontal part 10 of the well, the gas 9 provides buoyancy to the first end while moving the casing further into the well comprising the liquid 4. This makes it much easier to insert the casing further into the well, and it makes it possible to make longer cased wells than with known systems, since a casing filled with gas can be pushed further into the borehole than a casing filled with liquid.
  • a casing filled with gas can be pushed further into the borehole than a casing filled with liquid.
  • mud clean-out job By having a one-way valve arranged in the front end of the casing, it is still possible to subsequently fill the casing with liquid to flush or clean the annulus to perform a so-called "mud clean-out job" after the casing has been arranged in its final position.
  • the valve hinders liquid from entering the well while the casing is being submerged, but subsequently allows liquid to enter to perform a mud clean-out.
  • a ball 11 is dropped into the casing, as shown in Figs. 2 and 3A , which flows with the liquid until seating in a ball seat 12 arranged at the first end 8 of the casing, closer to the top of the well than the valve.
  • the valve is arranged in a part of the casing wall 7 which is parallel with an axial extension 23 of the casing. In this way, a tubular wall part 24 of the ball seat 12 is able to cover an inlet 20 of the valve when the ball seat is being slided into a position opposite the valve.
  • the liquid pressure forces the ball seat to slide from a first position, shown in Fig. 3A , to a second position, shown in Fig. 3B , in which second position the ball seat closes the inlet 20 of the valve.
  • the valve comprises a burst disc 21 which is adapted to close the valve when the disc is burst by the seat 12 sliding along the inner face 31 of the casing.
  • the downhole system 1 further comprises a plurality of annular barriers 14.
  • the annular barriers each comprises a tubular part 15 mounted as part of the casing, as shown in Fig. 5 .
  • An expandable sleeve 16 surrounds the tubular part which has an opening 17 through which fluid enters in order to expand the sleeve, as indicated by the dotted line.
  • the expandable sleeve is made of metal and is connected with the tubular part by means of connection parts 32.
  • One connection part may be slidable while another may be fixed in relation to the tubular part.
  • the one-way valve 6 is arranged in the end of the casing having a ball seat where a ball is arranged between the seat and the bottom of the casing and is pressed against the ball seat by means of a coiled spring which functions as a one-way valve preventing fluid from the well from entering the casing while the casing is submerged into the well.
  • the bottom of the casing has apertures for letting fluid enter through the valve 6 and further into the well.
  • the downhole system 1 further comprises inflow control valves 22 which may be opened after completion of the well, which initiated the production of hydrocarbon-containing fluid from the reservoir.
  • the downhole system 1 may further comprise sliding sleeves arranged opposite the inflow control valves, which sleeves may subsequently be slided by means of a wireline tool.
  • the downhole system 1 may further comprise frac ports 25 for ejecting fluid out of the casing and into the formation in order to fracture the formation to gain access to the hydrocarbon-containing fluid in the reservoir.
  • Completing a well begins by providing a one-way valve in a casing wall in a first end of the casing, the second end of the casing being closest to the top of the well. Then, the casing is filled with gas, such as air, and lowered into the well while the liquid in the well prevents the gas from escaping through the valve. When the first end of the casing is introduced into a horizontal part of the well, the gas provides buoyancy to the first end of the casing while moving the casing further into the well.
  • gas such as air
  • the casing is filled with fluid, such as a liquid or a mixture of gas and liquid, and the fluid enters through the valve at the end of the casing in order to flush or clean the annulus surrounding the casing and thus clean the well.
  • fluid such as a liquid or a mixture of gas and liquid
  • the fluid entering through the valve may be a cleaning fluid.
  • 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 any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.

Landscapes

  • 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)
  • Check Valves (AREA)
EP13172062.5A 2013-06-14 2013-06-14 Abschlussverfahren und Bohrlochsystem Withdrawn EP2813669A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13172062.5A EP2813669A1 (de) 2013-06-14 2013-06-14 Abschlussverfahren und Bohrlochsystem
PCT/EP2014/062366 WO2014198887A1 (en) 2013-06-14 2014-06-13 A completion method and a downhole system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13172062.5A EP2813669A1 (de) 2013-06-14 2013-06-14 Abschlussverfahren und Bohrlochsystem

Publications (1)

Publication Number Publication Date
EP2813669A1 true EP2813669A1 (de) 2014-12-17

Family

ID=48613503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13172062.5A Withdrawn EP2813669A1 (de) 2013-06-14 2013-06-14 Abschlussverfahren und Bohrlochsystem

Country Status (2)

Country Link
EP (1) EP2813669A1 (de)
WO (1) WO2014198887A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3575544A1 (de) * 2018-05-30 2019-12-04 Welltec Oilfield Solutions AG Bohrlochabschlusssystem

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9279295B2 (en) 2012-06-28 2016-03-08 Weatherford Technology Holdings, Llc Liner flotation system
US11466545B2 (en) 2021-02-26 2022-10-11 Halliburton Energy Services, Inc. Guide sub for multilateral junction

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117915A (en) * 1989-08-31 1992-06-02 Union Oil Company Of California Well casing flotation device and method
EP1184536A2 (de) * 2000-08-31 2002-03-06 Halliburton Energy Services, Inc. Verfahren und Vorrichtung zum Installieren einer Verrohrung im Bohrloch
WO2002075100A1 (en) * 2001-03-15 2002-09-26 Specialised Petroleum Services Group Limited Apparatus and method for running down hole liners
US20030116324A1 (en) * 2001-12-20 2003-06-26 Exxonmobil Upstream Research Company Installation of evacuated tubular conduits
WO2006065393A2 (en) * 2004-12-10 2006-06-22 Exxonmobil Upstream Research Company Tubular flotation with pressurized fluid
US20130068482A1 (en) * 2011-09-20 2013-03-21 Baker Hughes Incorporated Drop In Completion Method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117915A (en) * 1989-08-31 1992-06-02 Union Oil Company Of California Well casing flotation device and method
EP1184536A2 (de) * 2000-08-31 2002-03-06 Halliburton Energy Services, Inc. Verfahren und Vorrichtung zum Installieren einer Verrohrung im Bohrloch
WO2002075100A1 (en) * 2001-03-15 2002-09-26 Specialised Petroleum Services Group Limited Apparatus and method for running down hole liners
US20030116324A1 (en) * 2001-12-20 2003-06-26 Exxonmobil Upstream Research Company Installation of evacuated tubular conduits
WO2006065393A2 (en) * 2004-12-10 2006-06-22 Exxonmobil Upstream Research Company Tubular flotation with pressurized fluid
US20130068482A1 (en) * 2011-09-20 2013-03-21 Baker Hughes Incorporated Drop In Completion Method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3575544A1 (de) * 2018-05-30 2019-12-04 Welltec Oilfield Solutions AG Bohrlochabschlusssystem
WO2019229104A1 (en) * 2018-05-30 2019-12-05 Welltec Oilfield Solutions Ag Downhole completion system
US10837258B2 (en) 2018-05-30 2020-11-17 Welltec Oilfield Solutions Ag Downhole completion system
AU2019276081B2 (en) * 2018-05-30 2022-06-30 Welltec Manufacturing Center Completions ApS Downhole completion system

Also Published As

Publication number Publication date
WO2014198887A1 (en) 2014-12-18

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