WO2008125629A2 - Procédé de cimentation d'un chemisage de dessus de fond - Google Patents

Procédé de cimentation d'un chemisage de dessus de fond Download PDF

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Publication number
WO2008125629A2
WO2008125629A2 PCT/EP2008/054426 EP2008054426W WO2008125629A2 WO 2008125629 A2 WO2008125629 A2 WO 2008125629A2 EP 2008054426 W EP2008054426 W EP 2008054426W WO 2008125629 A2 WO2008125629 A2 WO 2008125629A2
Authority
WO
WIPO (PCT)
Prior art keywords
liner
wiper plug
plug
wiper
collar
Prior art date
Application number
PCT/EP2008/054426
Other languages
English (en)
Other versions
WO2008125629A3 (fr
Inventor
Peter Lumbye
Original Assignee
Mærsk Olie Og Gas A/S
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 Mærsk Olie Og Gas A/S filed Critical Mærsk Olie Og Gas A/S
Publication of WO2008125629A2 publication Critical patent/WO2008125629A2/fr
Publication of WO2008125629A3 publication Critical patent/WO2008125629A3/fr

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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
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
    • E21B33/16—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes using plugs for isolating cement charge; Plugs therefor
    • E21B33/165—Cementing plugs specially adapted for being released down-hole

Definitions

  • the current invention relates to a method for cementing an off bottom liner comprising the steps of establishing a first flow blockage in the liner at a location down-hole of a cementing valve located in the side wall of the liner, opening the cementing valve which exposes openings in the sidewall of the liner, pumping cement down the liner and out through the openings in the sidewall of the liner, establishing a second flow blockage up-hole of the openings in the cementing valve, closing the cementing valve, opening the second flow blockage to establish fluid communication through the second flow blockage, and opening the first flow blockage to establish fluid communication through the first flow blockage.
  • Off bottom liners are used in wellbores where the end of the liner does not reach the end of the wellbore. Off bottom liners can also be used in wellbores which are not purely vertical. Some wellbores can even be arranged horizontally.
  • liners are inserted into a wellbore to line the wellbore.
  • the liners are typically anchored to the wellbore via cement which is pumped out the bottom of the liner.
  • the cement flows into the annulus between the wellbore and the liner. When it hardens the liner is firmly cemented within the wellbore.
  • cement is pumped out through a cementing valve which is arranged as part of the liner and which comprises ports which allow the cement to flow out through the sidewall of the liner.
  • a typical cementing procedure starts with the liner being run to installation depth via a liner hanger running tool.
  • a one-way valve is located at the end of the liner to prevent fluid flow into the liner, but which allows fluid flow out of the end of the liner.
  • Two wiper plugs are suspended at the end of the liner hanger running tool. Once the liner has been run to the correct depth, the liner is hung off the inside of the casing via the liner hanger, the bottom wiper plug is released from the running tool and pumped down the well until it engages with a landing collar located near the bottom of the liner.
  • the wiper plug is typically released by pumping a pump down dart into the wiper plug, increasing the pressure up hole of the wiper plug and causing shear pins to break and a release mechanism to trigger that releases the wiper plug.
  • the end of the liner becomes plugged and the pressure in the liner can be increased.
  • down hole equipment such as an open hole packer can be activated.
  • the open hole packer is arranged on the outside of the liner and inflates when activated.
  • the open hole packer inflates such that it presses out against the wellbore. In this way, a seal is created between the volume located above the open hole packer and the volume located below the open hole packer.
  • Increased pressure is also used to open a cementing valve which is located near the bottom of the liner, but above the open hole packer. By opening the cementing valve, a port in the side of the liner is opened.
  • Cement can then be pumped down the liner, out through the cementing valve and into the annulus surrounding the liner. Due to the seal created by the open hole packer, cement is only pumped into the annulus above the open hole packer.
  • a top wiper plug is released from the running tool and pumped down the liner until it engages with a suitable collar located at the cementing valve. As with the bottom wiper plug, the top wiper plug is released by pumping a pump down dart into the wiper plug, raising the pressure in the liner and breaking shear pins that allows the wiper plug to be released from the liner running tool.
  • the pressure in the liner is increased again in order to close the cementing valve.
  • Excess cement is then circulated out of the casing on top of the liner and the liner hanger running tool is removed from the well after setting a liner hanger packer.
  • a drill string is introduced into the liner and is used to drill the top wiper plug, top collar, bottom wiper plug, bottom collar and one-way valve out with a drill bit in order to open the plugs and establish fluid communication with the wellbore beyond the bottom of the liner. Once fluid communication is re-established through the bottom of the liner, the drill string is removed from the liner.
  • One aspect of the current invention is therefore to provide a method of cementing an off bottom liner where it is not necessary to drill the plugs out at the end of the procedure in order to regain fluid communication to the wellbore below the liner.
  • This aspect is solved by a method as mentioned in the introductory paragraph where the steps of opening the first and second flow blockages are achieved by increasing the pressure in the liner above the blockages. By using blockages which open when the pressure is increased to a certain predefined level, it is not necessary to drill out the plugs.
  • the step of establishing a blockage at a location down hole of a cementing valve could comprise the step of pumping a wiper plug down the liner until it engages with a collar located down hole of the cementing valve.
  • the step of establishing a second blockage at a location up hole of the openings in a cementing valve could comprise the step of pumping a wiper plug down the liner until it engages with a collar located up hole of the openings in the cementing valve.
  • the method could further comprise the step of establishing a seal in the annular space between the liner and the wellbore below the cementing valve in order to separate the volume in the wellbore below the seal and the volume in the wellbore above the seal.
  • the seal could for example be formed with an open hole packer.
  • the liner comprises a one-way valve located at the end of the liner.
  • the method could further comprise the step of disabling the one-way valve. In this way, fluid can be pumped up the liner at the end of the procedure.
  • the wiper plug could comprise an outer wiper part and an inner hollow sleeve, and where the inner hollow sleeve is slideably arranged within the outer wiper part and is held in place by a release mechanism.
  • the inner hollow sleeve could be formed with through going openings which are exposed when the release mechanism releases and the inner hollow sleeve extends out the end of the wiper part.
  • the wiper plug could further comprise a restraining mechanism which locks the inner hollow sleeve once it is extended into its extended position. In this way, the inner sleeve is prevented from closing once it has been opened. This is beneficial during the production of oil, since it would be detrimental to the well if the well was blocked accidentally.
  • the wiper plug could also comprise a ratchet mechanism between the inner hollow sleeve and the outer part that would prevent the sleeve from closing. This is useful in the case where the sleeve only opens partially. In this case, a potential restraining mechanism hasn't engaged yet.
  • an assembly which comprises a liner, a liner hanger, a liner hanger running tool, a top wiper plug suspended at the end of the liner hanger running tool, a sidewall cementing valve comprising openings through the sidewall of the liner, a top collar arranged up hole of the openings in the cementing valve, a bottom plug arranged below the cementing valve, and where the top collar is arranged such that the top wiper plug engages with the top collar when the top wiper plug is pumped down the liner and where the top wiper plug and the bottom plug are of the type which can be opened by applying pressure up hole of the plug.
  • an assembly which comprises a liner, a liner hanger, a liner hanger running tool, a top wiper plug suspended at the end of the liner hanger running tool, a bottom wiper plug suspended below the top wiper plug, a sidewall cementing valve comprising openings through the sidewall of the liner, a top collar arranged up hole of the openings in the cementing valve, a bottom collar arranged below the cementing valve, and where the top collar is arranged such that the top wiper plug sealingly engages with the top collar when the top wiper plug is pumped down the liner and lets the bottom wiper plug pass the top collar when the bottom wiper plug is pumped down the liner and where the bottom collar is arranged to sealingly engage with the bottom wiper plug when the bottom wiper plug is pumped down the liner.
  • the inner diameter of the top collar could be larger than the outer diameter of the bottom wiper plug and the inner diameter of the bottom collar could be less than the outer diameter of the bottom wiper plug and the inner diameter of the top collar could be smaller than the outer diameter of the top wiper plug.
  • the assembly could be arranged such that the top and bottom wiper plugs are of the kind which can be opened by increasing the pressure upstream of the wiper plug.
  • Figures 1 a-1 e schematically show five steps according to one embodiment of a method according to the current invention.
  • Figure 1f shows the liner at the end of the cementing operation with the cement shown.
  • Figures 2a-2e schematically show five steps according to a second embodiment of a method according to the current invention.
  • Figures 3a-3f schematically show six steps according to a third embodiment of a method according to the current invention.
  • Figures 4a-4d show more detailed cross section views of one embodiment of a top wiper plug which can be used in a method according to the current invention.
  • FIG. 5 shows the top wiper plug of figures 4b and 4c in more detail.
  • Figure 6 shows the top wiper plug of figure 4d in more detail.
  • Figures 7a-7c show cross section views of a first embodiment of a bottom plug which can be used in a method according to the current invention.
  • FIG. 1 a-1 e The figures show a wellbore 1 , a casing 2, a liner 3, a liner hanger running tool 4, a top wiper plug 5, a cementing valve 6, an open hole packer 7 and a bottom plug 8. It should be noted that in the figures, the wellbore is shown without a bottom. This is to show that the current technique can be used in wells where the liner does not reach the bottom of the well.
  • the casing is suspended in the wellbore 2 by cement 22.
  • the liner 3 is run into the well bore and suspended near the end of the casing by the liner hanger running tool 4.
  • the liner is then hung off the end of the casing by a liner hanger (not shown).
  • the liner hanger allows flow past the liner hanger and in this way allows flow from the outside of the liner to flow up into the casing.
  • a liner hanger packer (9) is expanded to seal the opening between the liner and the casing and to secure the top of the liner to the casing.
  • the top wiper plug 5 is suspended near the top of the liner at the end of the liner hanger running tool 4.
  • the top wiper plug 5 is attached to the liner hanger running tool 4 by a release mechanism (not shown) which usually comprises a number of shear pins.
  • a release mechanism usually comprises a number of shear pins.
  • the person skilled in the art will be familiar with other release mechanisms suitable for this use.
  • the cementing valve 6 is arranged near the bottom of the liner 3 and comprises two sliding sleeves 10a, 10b and a number of openings 11 through the side walls of the liner 3.
  • the open hole packer 7 is arranged below the cementing valve 6 and is of the kind which when exposed to a pressure of a certain level, inflates such that it presses out against the sides of the wellbore, thereby establishing a seal between the volume of the wellbore above the open hole packer and the volume of the wellbore below the open hole packer.
  • the bottom plug 8 is arranged at the bottom of the liner.
  • the bottom plug 8 comprises a check valve 12 which allows flow out the end of the liner, but does not permit flow back up through the liner. In many cases, it is desired to be able to flush fluid out the bottom of the liner in order to ease the insertion of the liner.
  • the top wiper plug 5 and the bottom plug 8 both comprise an outer part 5a, 8a and an inner sliding sleeve 5b, 8b.
  • the inner sliding sleeves 5b, 8b both comprise openings 14,15 which are covered by the outer part 5a, 8a.
  • the inner sliding sleeve is held in place in the outer part by a release mechanism, for example shear pins.
  • the outer part 5a of the top wiper plug further comprises wiper blades such as are known from other wiper plugs in the industry.
  • the liner 3 is run into the well until it is in a position as shown in figure 1 a.
  • a ball 16 is dropped into the liner.
  • the ball has a diameter which is small enough so that it can pass through the top wiper plug 5, but large enough so that it is caught by the bottom plug 8.
  • the ball 16 is made of a material which is not too heavy. In many cases off bottom liners are used in horizontal wells, where a heavy ball would not reach the bottom plug. When the ball is made from a material which is not too heavy, the ball almost floats on the well fluid and can be pumped to the end of the liner, even if the liner is horizontal.
  • the bottom plug 8 also comprises a retaining mechanism (not shown) such that once the ball is caught in the plug, it cannot leave the plug.
  • a port in the open hole packer 7 opens and the open hole packer inflates until it presses out against the wellbore. The pressure can then be raised again until the bottom sleeve
  • a pump down dart 18 is dropped into the well.
  • the dart 18 is pumped down the well until it reaches the top wiper plug 5 where it is caught by the inner sliding sleeve 5b and locked into the sleeve. Once the wiper plug is caught, fluid flow is prevented from passing the top wiper plug.
  • the pressure above the wiper plug can then be increased until the release mechanism which holds the wiper plug to the liner hanger running tool is broken.
  • the top wiper plug can then be pumped down the liner until it reaches a landing collar 19 located at or inside the cementing valve.
  • the pressure behind the top wiper plug can then be increased some more until the top sleeve 10a of the cementing valve slides down and closes the openings 11 in the cementing valve. This is shown in figure 1 c.
  • the pressure behind the top wiper plug 5 can be increased, causing the release mechanism (not shown) between the inner sleeve 5b and the outer part 5a of the top wiper plug to release, thereby allowing the inner sleeve to slide down and expose the openings 14 in the inner sleeve. Fluid communication is therefore established again to the liner below the top wiper plug. This is shown in figure 1d.
  • the pressure behind the bottom plug 8 can then be raised, causing the release mechanism between the inner sleeve 8b and the outer part 8a of the bottom plug to release.
  • the inner sleeve 8b then slides down to expose the openings 15 in the inner sleeve of the bottom plug 8. At this point, fluid communication is re-established with the wellbore below the bottom plug.
  • top wiper plug and the bottom wiper plug are formed such that once the inner sleeves have been released and put into their free flow positions, the sleeves cannot move back into their closed positions. This could be with the help of a ratchet mechanism and/or some other form of locking mechanism.
  • An example of a top wiper plug and bottom plug suitable for this method will be described in more detail later on in this specification.
  • Figures 2a-2e show some of the steps of a second embodiment of a method of cementing an off bottom liner according to the current invention.
  • the steps are almost identical, with the exception of the bottom plug 30.
  • the other elements are therefore given the same reference numerals as in the first embodiment.
  • the process won't be described in detail, as the process steps are almost identical.
  • the bottom plug 30 is of the kind which is commonly called a "disappearing plug".
  • Plugs of this kind are well known in the industry and can, for example, comprise a plug 31 made of a hard packed material which dissolves when exposed to a high pressure.
  • the plug 31 is arranged in an outer part 32.
  • One example of such a plug is the "Mirage” (TM) plug manufactured by Halliburton.
  • the advantage of using a disappearing plug is that a simpler system is achieved.
  • the disadvantage of using a disappearing plug is that during the running in of the liner, the bottom of the liner is blocked and it is not possible to flush fluid out of the end of the liner 3. Not being able to flush out the end of the liner is acceptable in cases where the well parameters are well known and there is little risk in the liner installation. Therefore the solution with the disappearing plug is not always suitable.
  • a mechanical plug which is similar to the bottom plug 8 of the first embodiment can be used but which is already blocked at the start of the procedure. In this way, it is not necessary to drop a ball into the well. However, as with the disappearing plug, it is not possible to flush fluid out of the end of the liner during the running of the liner when the liner is equipped with this type of bottom plug.
  • Figures 3a-3f show some steps of a third embodiment of a process for cementing an off-bottom liner. Most of the steps are the same as the previous methods, and the same elements have been given the same reference numerals.
  • the difference is that two wiper plugs 5,40 are suspended from the end of the liner hanger running tool 4.
  • the two plugs are a top wiper plug 5 which is identical to the one used in the first and second embodiments and a bottom wiper plug 40 which is similar to the top wiper plug 5.
  • the bottom wiper plug 40 is attached to the top wiper plug 5 with a release mechanism such as shear pins (not shown).
  • the wiper plugs are of the kind which permit fluid flow through them until they are blocked by a plug 18,41 which is pumped down the well or dropped into the well.
  • plugs 7,8 are known in the industry and don't need to be described in more details.
  • the plugs which block the wiper plugs are typically in the form of a ball or a wiper dart. In the current embodiment, a wiper dart is used. Again, this technology is well known to the person skilled in the art and won't be discussed further here.
  • the wiper plugs 5,40 are furthermore of the type which comprise means for re-establishing fluid flow through them at a time after they have been blocked by a plug.
  • Plugs of this kind are known to the person skilled in the art from other cementing procedures. See for example the references in the introduction of this specification. However, the plugs of this kind have not been used in a method according to this invention before. Furthermore, while the known plugs can be used in a method according to the current invention, they are not optimal. An example of a plug designed for use in this method is described later on in this specification
  • a bottom collar 42 is located near the bottom of the liner.
  • the bottom collar is designed such that when the bottom wiper plug is pumped down the liner, the bottom wiper plug will engage with the bottom collar and not be able to pass the bottom collar.
  • a check valve 43 is arranged at the bottom of the liner 3.
  • the top collar 19 is designed such that when the bottom wiper plug 40 is pumped down the liner, the bottom wiper plug does not engage with the top collar and is able to pass the top collar.
  • the top collar 19 is also dimensioned such that when the top wiper plug 5 is pumped down the liner, it engages with the top collar 19 and is not allowed to pass it. This could be arranged by ensuring that the outer diameter of the bottom wiper plug was smaller than the inner diameter of the top collar and greater than the inner diameter of the bottom collar.
  • the top wiper plug can be arranged such that its diameter is greater than the inner diameter of the top collar.
  • the top 5 and bottom 40 wiper plugs are attached to the liner hanger running tool and there is free fluid flow through the wiper plugs and out the end of the liner.
  • a dart 41 is dropped into the well.
  • the dart 41 has an outer diameter which is greater than the inner diameter of the outlet 44 of the bottom wiper plug 40.
  • the dart 41 therefore blocks the outlet of the bottom wiper plug and blocks fluid flow through the bottom wiper plug.
  • the bottom wiper plug is pumped down the liner, past the top collar 19 and past the cementing valve 6 until it reaches the bottom collar 42 as shown in figure 3b.
  • the bottom wiper plug engages with the bottom collar 42 and blocks the end of the liner 3.
  • the bottom wiper plug is arranged to press the one-way valve 43 open. In this way, once the bottom wiper plug is arranged in the bottom collar, the one-way valve is fixed in the open position.
  • the pressure can then be increased in the liner.
  • the increased pressure first causes the open hole packer 7 to inflate and then causes the cementing valve 6 to open. This is shown in figure 3c.
  • cementing valves and open hole packers of the type discussed here are known to the person skilled in the art. These devices have therefore been shown very schematically.
  • cement can be pumped out through the ports 11 in the cementing valve and into the annulus between the wellbore 1 and the liner.
  • the flow of cement is shown in figure 3c by the arrows 17.
  • a second dart 18 is dropped into the well.
  • the outer diameter of the second dart 18 is larger than the diameter of the outlet 20 of the top wiper plug.
  • the second dart therefore plugs the outlet of the top wiper plug.
  • Pressure can then be raised again in the running tool 4 causing force to be applied to the top wiper plug which shears the shear pins between the top wiper plug and the running tool. This releases the top wiper plug which can be pumped down the liner until it engages with the top collar 19.
  • the top wiper plug can be forced open due to the design of the top wiper plug.
  • the release mechanism between the inner sleeve 5b and the outer part 5a of the plug is released and the inner sleeve 5b slides down, exposing the openings 14 in the inner sleeve. This re-establishes fluid communication through the top wiper plug. This is shown in figure 3e.
  • pressure can be applied to the bottom wiper plug which can also be opened in the same manner as the top wiper plug.
  • force can be applied to the inner sleeve 40b of the bottom wiper plug.
  • FIGS. 4a-4d show more detailed cross section views of one embodiment of a top wiper plug which could be used with the above described methods.
  • Figure 4a shows the wiper plug 5 suspended at the end of the liner hanger running tool 4 and arranged inside the liner 3.
  • the dart 18 is shown on its way into the wiper plug.
  • Figure 4b shows the wiper plug on its way down the liner after it has been released from the liner hanger running tool. The dart is fully engaged with the end of the wiper plug thereby blocking the outlet 20 of the wiper plug.
  • Figure 4c shows the wiper plug engaged with the top collar 19 of the cementing valve 6.
  • Figure 4d shows the wiper plug after the inner sleeve 5b has been released from the outer part 5a and the openings 14 in the inner sleeve have been exposed. The wiper plug is now open for free flow through the plug. It should be noted that in the open position, the sleeve is locked by a locking mechanism to prevent it from returning to its closed state.
  • Figure 5 shows the top wiper plug in its closed flow position in more detail and figure 6 shows the top wiper plug in its open flow position in more detail.
  • the wiper plug 5 comprises an inner sleeve 5b, an outer part 5a and a dart 18 which has been pumped down the well and into the plug such that it blocks the outlet 20 of the inner sleeve.
  • the dart 18 is equipped with a locking ring 60 which locks the dart 18 in the inner sleeve 5b once the dart is fully inserted in the sleeve.
  • the inner sleeve 5b is fastened to the outer part 5a with two independent release mechanisms.
  • the first release mechanism 61 comprises shear pins arranged around the circumference of the inner sleeve. When the force between the inner sleeve and the outer part is great enough, these pins shear and release the inner sleeve from the outer sleeve.
  • the second release mechanism 62 comprises a slideable pin 63 arranged in a slot in the outer part and a bendable hook 64 attached to the inner sleeve. When the wiper plug is on its way down the liner, the hook is engaged with the slot in the outer part. When the wiper plug lands in the collar 19, the pin 63 is pressed in thereby displacing the hook 64 indwardly.
  • the hook 64 thereby releases the slot in the outer part and releases the inner sleeve from the outer part. In this way, the inner sleeve cannot be released until it is sitting properly on the collar 19. This ensures that the wiper plug does not accidentally open on its way down the liner if the pressure in the liner were to increase above the shearing force of the shear pins. This could for example occur if the wiper plug where to meet an obstruction at a position above the top collar.
  • the wiper plug 5 further comprises a locking mechanism 65 which engages when the inner sleeve has been fully extended.
  • the locking mechanism 65 comprises a spring biased split ring or c-ring connected to the inner sleeve which engages with a recess 66 in the outer part near then end of the outer part. The locking mechanism ensures that once the sleeve has been fully opened, it can't accidentally close again.
  • the wiper plug can furthermore comprise a ratchet mechanism (not shown) between the inner sleeve and outer part in order to prevent the sleeve from closing again if the sleeve does not open enough to engage the locking mechanism.
  • a ratchet mechanism (not shown) between the inner sleeve and outer part in order to prevent the sleeve from closing again if the sleeve does not open enough to engage the locking mechanism.
  • the wiper plug also comprises a second locking ring 67 which locks the wiper plug in the collar 19 when the wiper plug is engaged with the collar.
  • An end stop 68 is furthermore arranged at the end of the inner sleave which prevents the sleeve from sliding completely out of the outer part 5a.
  • Seals 69 are arranged between the inner sleeve and the outer sleeve.
  • Additional seals 70 are arranged on the outer part which establish a seal between the outer part and the collar 19.
  • openings 14 in the inner sleeve are arranged as slots. In this way, it is possible to provide a very large opening area through the plug thereby reducing the flow resistance of the plug.
  • FIGs 7a-7c show an embodiment of a bottom plug in different modes.
  • the bottom plug 8 shown in the figures is suitable for use in a method which is similar to the method described in figures 1 a-1 e.
  • the bottom plug is fixed to the liner at a position near the end of the liner before the liner is run into position.
  • the plug 8 has a one way valve 12 at its outlet which ensures that fluid can flow out of the liner, but not into the liner.
  • Figure 7a shows the plug in the state it is in when the liner is being run into position.
  • the plug has an inner sleeve 8b which is fastened to an outer part 8a with shear pins 80. There is free flow through the plug out of the liner.
  • the bottom plug also comprises seals 82 located between the inner sleeve 8b and the outer part 8a.
  • Figure 7b shows the plug after a ball 16 has been dropped into the plug.
  • the ball is held in place by the pressure in the tube.
  • a retaining mechanism 81 is arranged in the plug to hold the ball in place. Once the ball is in place, the outlet of the bottom plug is blocked.
  • Figure 7c shows the plug after the pressure in the liner has been increased.
  • the shear pins 80 have broken and the inner sleeve 8b has been displaced forward with respect to the outer part 8a. In this position, the openings 15 in the inner sleeve which were previously blocked by the outer part are now exposed and fluid is free to flow either way through the bottom plug.
  • cement is typically used to fasten off bottom liners in a well-bore.
  • materials for example polymer systems or other forms of concrete which would also fulfil the demands of the fastening material. Therefore, the person skilled in the art should interpret the term "cement” more broadly than its pure literal meaning, thereby including the other suitable materials within the definition of the term cement in the context of this specification.

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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)
  • Lift Valve (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

Cette invention concerne un procédé de cimentation d'un chemisage de dessus de fond comprenant les étapes consistant à : établir un premier blocage d'écoulement dans le chemisage à un emplacement situé en aval d'une vanne de cimentation positionnée dans la paroi latérale du chemisage ; ouvrir la vanne de cimentation pour exposer des ouvertures dans la paroi latérale du chemisage ; pomper du ciment dans le sens descendant le long du chemisage et hors des ouvertures situées dans la paroi latérale du chemisage ; établir un second blocage d'écoulement en amont de la vanne de cimentation ; fermer la vanne de cimentation ; ouvrir le second blocage d'écoulement pour établir une communication fluidique à travers le second blocage d'écoulement ; et ouvrir le premier blocage d'écoulement pour établir une communication fluidique à travers le premier blocage d'écoulement. Les étapes d'ouverture du premier et du second blocage d'écoulement sont atteintes en augmentant la pression dans le chemisage au-dessus des blocages. De cette manière, il est possible de cimenter un chemisage de dessus de fond et de rétablir la communication fluidique vers le trou de forage en dessous du chemisage sans qu'il soit nécessaire de procéder à des opérations de forage.
PCT/EP2008/054426 2007-04-13 2008-04-11 Procédé de cimentation d'un chemisage de dessus de fond WO2008125629A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/787,090 US20080251253A1 (en) 2007-04-13 2007-04-13 Method of cementing an off bottom liner
US11/787,090 2007-04-13

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Publication Number Publication Date
WO2008125629A2 true WO2008125629A2 (fr) 2008-10-23
WO2008125629A3 WO2008125629A3 (fr) 2009-04-02

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