• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    METHODS FOR REMOVING A BUFFER AND FOR REMOVING A DEGRADABLE BARRIER BUFFER, AND, APPLIANCE FOR USE IN AN UNDERGROUND WELL AND FOR REMOVING A DEGRADABLE BUFFER Methods and apparatus are presented for removing a degradable barrier plug, positioned in an axial passage of hole below . The degradable buffer is initially isolated from the fluid by at least one solid, non-degradable cover. A first electronic rupture disc unit is activated to open a passage for the degradable buffer. A second electronic rupture disc unit is actuated to allow a fluid, such as water from a supply chamber, to drain to contact the plug. The buffer is substantially degraded, although the cover remains. A third electronic rupture disc unit is actuated to bend and then cover the remaining solid cover, thereby opening the axial passageway and protecting the tools introduced last.
    公开号:BR112015004235B1
    申请号:R112015004235-0
    申请日:2012-08-31
    公开日:2021-01-05
    发明作者:Michael L. Fripp；Donald G. Kyle；Jeff Huggins
    申请人:Halliburton Energy Services, Inc.；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] Methods and apparatus for removing a degradable barrier plug from an axial passage of a well hole. More specifically, methods and devices for removing the plug using electronic rupture disc (ERD) units are described. BACKGROUND OF THE INVENTION
    [002] It is common in hydrocarbon wells to perform well operations requiring a temporary plug of the axial passage through a tool or tool column. For example, such barrier plugs are used in the placement of shutters, testing the column of tubes etc. Recently, the industry has developed degradable or dissolvable plugs, or otherwise removable plugs in situ. Degradable plugs can be of various materials and degraded using various methods. A common method is to degrade a soluble buffer using a fluid, often water. Since plugs are often degradable on contact with tubular fluids, such as well-bore or treatment fluids, the degradable plug is initially isolated from such fluids. The insulation is removed, for example, using rupture discs or other temporary covers. Some methods use ERD units hydraulically driven by pressure pulses propagated through the well-bore fluid, etc. There remains a need for other drive methods, in conjunction with degradable barrier plugs. SUMMARY OF THE INVENTION
    [003] In a preferred embodiment, a method is presented to remove a degradable barrier plug, positioned in a tubular hole below, having an axial passage through it, the tubular positioned in an underground well hole, the degradable barrier is initially isolated from the fluid in the axial passage by at least one non-degradable, solid cover. A first electronic rupture disc is activated to open a fluid passage for the degradable buffer. A second electronic rupture disc unit is then actuated to allow fluid to seep through the passage and to contact the degradable plug. The plug is then substantially degraded by the fluid, preferably water from an annular tubular chamber. A third electronic rupture disc drive is then triggered to allow a sleeve to slide over remnants of the solid, non-degradable cover. The electronic rupture disc units are electrically powered by wire or battery, they are quite robust for down-hole environments and are operable to drill or break an associated rupture disc. For example, an electronic rupture disc drive commercially available from Halliburton Energy Services, Inc. and drives a pin through the rupture disc. In a preferred embodiment, the sliding sleeve is initially held in position by fluid pressure in a high pressure chamber. When the third ERD unit is activated, the fluid flows through a flow limiter and into a low-pressure chamber, thereby allowing the slide sleeve to move. The glove moves to fold and cover the non-degradable, solid cover, thereby opening the axial passage and protecting the final displacement tools. BRIEF DESCRIPTION OF THE DRAWINGS
    [004] For a more complete understanding of the details and advantages of the present invention, reference is now made to the detailed description of the invention, together with the accompanying figures, in which corresponding numerals in the different figures refer to corresponding parts and in which: Figure 1 is a schematic illustration of a below exemplary hole tool 10, for use according to the invention; Figure 2 is a schematic cross-section of a preferred embodiment of the invention; Figure 3 is a schematic view of a detail of Figure 2, illustrating an exemplary electronic rupture disc for use in accordance with an embodiment of the invention; Figure 4 is a schematic detailed view of an exemplary fluid access system, used in accordance with the invention; and Figure 5 is a schematic detailed view of an exemplary sliding sleeve unit for use in accordance with an aspect of the invention.
    [005] It should be understood by those skilled in the art that the use of directional terms, such as above, below, top, bottom, up, down and the like are used in relation to illustrative embodiments when they are represented in the figures , the upward direction being towards the top of the corresponding figure and the downward direction being towards the bottom of the corresponding figure. Where this is not the case and a term is being used to indicate required guidance, the Report will clarify this. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
    [006] Although the making and use of various embodiments of the present invention are discussed in detail below, a practitioner of the technique will appreciate that the present invention provides applicable inventive designs, which can be embodied in a variety of specific contexts. The specific embodiments discussed here are illustrative of specific ways of producing and using the invention and not limiting its scope. The description is provided with reference to a vertical well hole; however, the inventions described here can be used in horizontal, vertical or offset well holes.
    [007] Figure 1 is a schematic illustration of an exemplary bore tool below 10, for use according to the invention. Tool 10 is a degradable bore buffer tool to be operated as an integral part of the pipe column. The particular tool shown is a Mirage (trade name) Disappearing Plug (disappearance buffer) that is commercially available from Halliburton Energy Services, Inc. More than one model of Mirage buffer (trade name) is available, including single and multicycle models . The tool will not be examined in detail, except when referring to the improvements presented here. It is understood that the invention described here can also be used with other models and types of degradable buffer tools.
    [008] The degradable buffer tool 10 includes a housing 12, which can be made of several parts, a water carrier 16 and a degradable buffer unit 18. Water carrier 16 defines a fluid chamber 19 housing a fluid supply, typically drinking water, in the tool. The fluid can be of various types and is selected to degrade the buffer. The fluid can be drinking water, brine, caustic, alkali, diesel or other hydrocarbon etc. The fluid chamber 19 includes a selectively openable orifice 20, fluidly connected to a fluid conduit that allows the fluid, once released, to flow towards the buffer unit. Water carrier 16 is optional and is preferred in situations where well bore fluids or in situ treatment fluids do not degrade the plug or degrade the plug efficiently.
    [009] The degradable buffer unit 18 includes the degradable buffer 22, the buffer mandrel 24, preferably a selectively openable hole 28 and top and bottom insulation covers 30 and 32. The selectively openable holes 28 and 20 when opened, they provide fluid communication between the plug 22 and the fluid chamber 19. The plug mandrel 24 holds the plug 22 in position. The top and bottom insulation covers 30 and 32 are operable to isolate the plug from fluids above and below the plug in the axial passage. The covers are sealed through the axial passage, providing a layer that is impervious to typical well-bore and treatment fluids. Furthermore, the covers are preferably non-degradable, compared to the plug, and not designed to degrade, dissolve, disappear or otherwise fail to expose to borehole conditions below. Preferably, the covers are metal discs and welded to the housing. Once the covers need to be removed to allow free access along the axial passage, the covers are also mobile or removable, typically after sufficient buffer degradation. In a preferred example, the covers are a thin layer of malleable metal, which can be readily folded and shaped to unblock the axial passage.
    [0010] The degradable buffer, in a preferred embodiment, is made of a salt-sand mixture, remains solid at temperatures and bore pressures below and is degradable in water. The term "degradable buffer" as used herein includes buffers often described as dissolvable, disappearing or disposable. The operation of the plug is known in the art and not explained in detail here.
    [0011] The holes selectively capable of being opened 20 and 28, in a preferred embodiment, have rupture discs initially blocking the flow of fluid through the holes. The rupture discs are typically driven (broken) in response to a fluid pressure signal, transmitted along the axial or other fluid passage. The rupture of the discs opens the associated holes.
    [0012] Figure 2 is a schematic cross-section of a preferred embodiment of the invention. A housing 30 accommodates a barrier device 32, a degradable buffer unit 40, a fluid chamber 42, a fluid bypass unit 44 and a movable sleeve unit 46. Housing 30 is typical of bore tools below and can be mounted of numerous parts sealed together, to prevent the flow of unwanted fluid between the axial passage 48 and the exterior of the housing.
    [0013] The barrier device 32 is described in detail in various embodiments in references incorporated herein and will not be described in detail. The barrier device 32 preferably prevents debris from entering the chamber 42. In addition, the barrier preferably seals or substantially seals against the flow of fluid from the axial passage 48 to the chamber 42. Alternative embodiments are available and, where well bore fluid is used to spend the buffer, it may not be necessary.
    [0014] The degradable buffer unit 40 includes a degradable buffer 50, a buffer mandrel 52 and a buffer sealing unit 54. The degradable buffer is preferably a sand and salt compound, but can be made of various materials, as discussed in embedded references. The buffer chuck is also described in the incorporated references. The buffer sealing unit can take many forms, as also described in the incorporated references, but in a preferred embodiment the sealing unit comprises an upper end cover 56 and a lower end cover 58, each of which fluidly seals the buffer unit. In a preferred embodiment, covers 56 and 58 are thin, welded metal disks on the housing or shoulder wall.
    [0015] In a preferred embodiment, the fluid chamber 42 is filled with a degrading fluid, such as drinking water, brine etc., as explained above, before inserting the plug in the well bore. The fluid is operable to wear or degrade the plug 50. The fluid chamber is initially sealed so that the fluid inside it does not come in contact with the plug. In an alternative embodiment, the substantially sealed chamber may be unnecessary and the fluid from the well hole in the axial passage used to degrade the plug.
    [0016] The fluid bypass unit 44 includes a fluid bypass passage 60, extending between a camera hole 62 and a buffer access hole 64, and initially sealed against fluid flow at either end by Electronic Rupture Disks (ERD) 66 and 68. Alternatively, a single ERD can be used for diversion.
    [0017] The movable sleeve unit 46 includes a sleeve 70 and a drive unit 72. The sleeve is slidable downwards within the housing. The operation of sliding gloves is common in the industry and will be understood by those skilled in the art. The embodiment described here is exemplary. The drive unit, in a preferred embodiment, includes a low pressure chamber 74 and a high pressure chamber 76 connected by an actuator passage 78. The flow of fluid through the actuator passage is initially prevented by an ERD 80 positioned in the ticket. The passageway extends between a low pressure port and a high pressure port 82. In a preferred embodiment, the low pressure chamber is filled with a gas, such as air at atmospheric pressure. The high pressure chamber is preferably filled with a liquid, such as oil. The pressure inside the high pressure chamber 76 keeps the sleeve 70 in an initial position, as shown, with the sleeve above the plug, top cover, etc. In a preferred embodiment, the high pressure chamber is defined by an inner surface of the sleeve 70, a sealing element 83, a sealing element location 84 extending from the housing, a part of the inner wall of the housing 86 and sealed by ERD 80 in hole 82. Additional seals 85 can be used as well. The low pressure chamber 74 and the drive passage 78 are preferably defined within the housing wall.
    [0018] In the actuation of the ERD 80, the high pressure fluid flows into or towards the low pressure chamber, thereby reducing the pressure inside the high pressure chamber. The glove 70 is then free to slide downwards, as indicated and in contact with the buffer cover 56 (and / or buffer cover 58). The downward movement of the sleeve 70 is limited by a cam or other movement limiter.
    [0019] Figure 3 is a schematic view of a detail of Figure 2 illustrating an exemplary electronic rupture disc for use in accordance with an embodiment of the invention. The ERD unit 68 is shown in a preferred embodiment in greater detail in Figure 3. The ERD unit includes a rupture disc 90 and a drive unit 92. The rupture disc 90 blocks the flow of fluid through the access port of the buffer 64, until the disk is broken. In a preferred embodiment, the rupture disc is welded in the housing or buffer mandrel. Preferably, air or other benign gas fills the space between the plug access hole and the rupture disc. The drive unit 92 is positioned in a hole 94 made for that purpose in the side wall of the housing. Spacers 96 allow correct spacing of the elements. A screw cap 98 keeps the driver in position and prevents leakage of fluid through the probe. A shoulder or other limiter 100 is provided to position and maintain the position of the drive unit. The drive unit in a preferred embodiment includes an extensible pin 102, which is extended in contact with the rupture disk 90 in the drive. Wires 104 provide electrical connection to an electronic package (not shown) for operation of the ERD drive unit. Wires 104 can be positioned in passage 60 or in a separate passage. Upon rupture, fluid communication is provided between the plug 50 and the passage 60 through the orifice 64 and beyond the now broken disk and driver unit. Although the term rupture disc is used from beginning to end, it is intended that the rupture disc can be any material that blocks fluid connectivity between spaces.
    [0020] The drive unit, in a preferred embodiment, is a drive unit for breaking disks. The drive units are commercially used by Halliburton Energy Services, Inc. and a description of their structure and use can be found below, which is hereby incorporated by reference for all purposes: US Patent Application No. 2010/0175867, Wright, filed on January 14, 2009; U.S. Patent Application Publication No. 2011/0174504, to Wright, filed January 15, 2010; and Wright U.S. Patent Application Publication No. 2011/0174484, filed December 11, 2010. Additional trigger units are known in the art and will be understood by persons skilled in the art. The key components of Electronic Rupture Disc units are the barrier or rupture disc, an electrical power source and an electrically-initiated method of breaking the barrier disc. In the preferred embodiment, the barrier is a metallic rupture disk, the source of electrical energy is a battery and a drive unit is used to pierce the barrier. In an alternative embodiment, the barrier is a glass dome and an exothermic heat source is used to soften the glass to the point of failure. In an alternative embodiment, the barrier is a ceramic insert and an electrically powered motor is used to drill through the ceramic.
    [0021] Figure 4 is a schematic detailed view of an exemplary fluid access system used in accordance with the invention. Fluid 42 contained within housing 30, or axial passage fluid 48, is used to degrade the plug, as explained above. Fluid access port 62 is defined in the housing wall and is fluidly connected to fluid diversion 60 at rupture of rupture disc 106 of rupture disc unit 66. A nut or other limiter 108 can be used to hold the unit ERD in position. The drive unit 200 is similar to the drive unit described above, having an extensible pin 204 to break the disc and will not be examined here again. The 202 wires provide an electrical connection with an electronic package (not shown) for operation of the ERD drive unit.
    [0022] Figure 5 is a schematic detailed view of an exemplary sliding sleeve unit for use in accordance with an aspect of the invention. The ERD unit 80 is positioned along the passage 78 between the low pressure chamber 74 (not seen) and the high pressure chamber 76. An actuator unit 110 of the ERD unit is operable to extend an extendable pin 112 in contact with and for rupture the rupture disc 114. Once ruptured, fluid flow is allowed through the passage 78 between the pressure chambers. The disc 114 is preferably welded in the housing. Wires 118 provide electrical connection with an electronic package (not shown), for operation of the ERD drive unit. A flow limiter 116 is preferably positioned in flow passage 78 or in port 82.
    [0023] In use, a delay is provided between the activation of the ERD 68 and 66 units and the activation of the ERD 80 unit. In the meantime, the fluid has substantially dissolved the buffer 50. The top cover 56 may additionally be intact or ruptured due to pressure pipe or other forces. To remove the cover 56 or its remnants, substantially from the axial passage 48, to allow free movement of the tools introduced last, the sleeve unit is actuated. The ERD driver 110 extends pin 112 and breaks disk 114. The high pressure fluid inside chamber 76 now moves into passage 78, towards and / or into the low pressure chamber 74. This flow is preferably limited or measured via fluid flow limiter 116. Controlled release of pressure in chamber 76 allows the use of a thinner sleeve 70. The limiter can be a nozzle, flow control device, fluid diode, control device autonomous flow and others as are known in the art. The sleeve 70 now moves down and bends or "wipes" the cover 56 over the buffer mandrel 52 and to a position substantially clearing the axial passage. The glove 70 can include a chamfered end 120, if desired, which can pierce or assist in scrubbing the cover 56. Alternatively, the glove end can be chamfered to allow more movement down the glove and joining the outer surface of the glove to the surface internal of the buffer chuck. The inner diameter of the sleeve is approximately the same as the minimum diameter of the buffer mandrel, allowing space for the wiped cover. In alternative embodiments, the glove contacts and rubs both the top and bottom covers, or a second glove unit is provided to rub the bottom cover.
    [0024] For more description regarding the degradable buffer tools, similar to the one shown, their construction and use and additional degradable buffer and temporary sounding buffer tools, see the following, which is hereby incorporated here by reference for all purposes: Mirage (trade name) Disappearing Plug and Autofill Sub, Halliburton Completion Tools, Completion Solutions (2010) (available online); Halliburton Well Completion Catalog, Subsurface Flow Control Systems, p. 8 - 80 (2011); U.S. Patent Application 13 / 045,800, Flow Control Screen Assembly Having Remotely Disabled Reverse Flw Control Capability, by Veit, application date March 11, 2011; U.S. Patent Application 13 / 041,611, Check Assembly For Well Stimulation Operations, by Veit, application date March 7, 2011; U.S. Patent Application Publication 2007/0251698, Temporary Well Zone Isolation, by Gramstad, et al, published November 1, 2007; U.S. Patent Application Publication 2011/0265987, Downhole Actuator Apparatus Having A Chemically Activated Trigger, by Wright, published November 3, 2022; U.S. Patent 6,450,263, Remotely Actuated Rupture Disk, to Schwendemann, issued September 17, 2002; U.S. Patent 6,076,600, Plug Apparatus Having A Dispersible Plug Member And A Fluid Barrier, by Vick, Jr., et al, issued June 20, 2000; U.S. Patent 6,095,258, Pressure Actuated SafetySwitch For Oil Well Perforating, by Reese, et al, issued August 1, 2000; U.S. Patent 5,146,983, Hydrostatic Setting Tool Including A Selectively Operable Apparatus Initially Blocking An Orifice Disposed Between Two Chambers and opening In Response To A Signal, by Hromas, et al, issued September 15, 1992; U.S. Patent 5,947,205, Linear Indexing Apparatus With Selective Porting, to Shy, issued September 7, 1999; U.S. Patent 6,119,783, Linear Indexing Apparatus And Methods Of Using Same, by Parker et al, issued September 19, 2000; U.S. Patent 5,479,986, Temporary Plug System, Gano, et al, issued January 2, 1996; U.S. Patent 6,397,950, Apparatus And Method For Removing A Frangible Rupture Disc or Other Frangible Device From A Wellbore Casing, by Streich, et al, issued June 4, 2002; U.S. Patent 5,826,661, Linear Indexing Apparatus And Methods Of Using Same, by Parker, et al, issued October 27, 1998; U.S. Patent 5,685,372, Temporary Plug System, to Gano, issued November 11, 1997; U.S. Patent 6,026,903, Bidirectional Disappearing Plug, by Shy, et al, issued February 22, 2000; and U.S. Patent 5,765,641, Bidirectional Disappearing Plug, by Shy, et al, issued June 16, 1998.
    [0025] Exemplary methods of using the invention are described, with the understanding that the invention is determined and limited only by the claims. Those skilled in the art will recognize that additional steps, different order of steps, and that not all steps need to be performed to practice the inventive methods described.
    [0026] In preferred embodiments, the following methods are described. A method for removing a degradable barrier plug, positioned in a tubular hole below, having an axial passage through it, the tubular positioned in an underground well hole, the degradable barrier plug sealing the axial passage against fluid flow, degradable barrier buffer isolated from the fluid in the axial passage by at least one non-degradable, solid cover, the method comprising the steps of: driving a first electronic rupture disc unit to open a fluid passage for the degradable buffer; optionally drive a second electronic rupture disc unit to allow fluid to flow through the passage and to contact the degradable plug; substantially degrade the degradable buffer; and optionally drive a third electronic rupture disc unit, to allow a glove to slide over the remnants of the solid, non-degradable cover. In addition, the method may include the step of driving a first electronic rupture disc unit, further comprising the step of drilling a first rupture disc; wherein the step of drilling a first electronic rupture disc further comprises moving a pin through the first rupture disc, the electronically enabled movement; wherein the first rupture disc is initially positioned to block the flow through a buffer passage extending from the buffer to the first rupture disc; wherein the buffer passage is initially filled with a gas in the chamber defined between the buffer and the first rupture disc; additionally comprising the stage of supplying electrical energy through electrical conduits for the first, second and third electronic rupture disc units; wherein the step of driving a second electronic rupture disc unit further comprises the step of drilling a second rupture disc; wherein the step of drilling a second electronic rupture disc further comprises moving a pin through the second rupture disc, the electrically driven movement; wherein the second rupture disc is positioned to block fluid flow through a fluid supply passage extending from a fluid supply to the second rupture disc; wherein a first rupture disc of the first electronic rupture disc unit is initially positioned to block flow through a buffer passage extending from the degradable buffer to the first rupture disc, and where the second rupture disc is positioned to blocking the flow of fluid through a fluid supply passage extending from a fluid supply to the second rupture disc; wherein the fluid supply passage is in fluid communication with the buffer passage; further comprising the step of draining a fluid from a water supply through the fluid supply passage and for contacting the degradable plug; where the fluid is water; wherein the water supply is an annular water chamber positioned over the tubular bore below; wherein the step of driving a third electronic rupture disc unit further comprises drilling a third rupture disc; wherein the third rupture disc initially separates a high pressure chamber filled with high pressure fluid and a low pressure chamber filled with low pressure fluid; wherein the high pressure fluid prevents the sleeve from sliding; wherein the step of piercing the third rupture disc allows the fluid in the high pressure chamber to flow out of the high pressure chamber and thereby allows the glove to slide over the remnants of the solid, non-degradable cover; wherein the non-degradable, solid covering is made of metal; and wherein the flow of fluid from the high pressure chamber is regulated by a flow limiter.
    [0027] Persons skilled in the art will recognize various combinations and orders of the steps and details described above of the methods presented here. Although this invention has been described with reference to illustrative embodiments, this description is not intended to be interpreted in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the invention will be apparent to those skilled in the art, in reference to the description. It is therefore intended that the appended claims cover any such modifications or embodiments.
    权利要求:
    Claims (12)
    [0001]
    1. Method for removing a plug positioned to block fluid flow through a passage in a borehole tubular positioned in an underground well hole, the plug isolated from the fluid in the passage through at least one cover, the method characterized by the fact that it comprises the steps of: driving an electronic rupture disc unit (66) to open a fluid diversion (60) to the plug (50); drive a second electronic rupture disc (68) to allow the fluid to drain in contact with the plug; degrade the buffer using a fluid; and driving a third electronic rupture disc unit (80) to move a movable member (46) to contact at least part of the cover (56).
    [0002]
    2. Method according to claim 1, characterized by the fact that the passage (48) extends longitudinally through the bore tubular below.
    [0003]
    Method according to either of claims 1 or 2, characterized by the fact that the rupture disc of the rupture disc unit is initially positioned to block the flow of fluid along the fluid diversion between the plug and the disc of break.
    [0004]
    Method according to any one of claims 1 to 3, characterized by the fact that it additionally comprises the step of supplying electrical energy to the electronic rupture disc unit.
    [0005]
    Method according to claim 1, characterized by the fact that a second rupture disc of the second rupture disc unit is initially positioned to block fluid flow between the fluid diversion and a fluid supply (42).
    [0006]
    6. Method according to claim 5, characterized by the fact that the fluid diversion fluidly connects the buffer and a fluid supply; wherein the method optionally further comprises the step of draining a fluid from an included fluid supply, loaded into the down-hole tubular through the fluid bypass and for contacting the plug.
    [0007]
    7. Method according to claim 1, characterized by the fact that it additionally comprises the step of delaying the activation of the electronic rupture disc unit, until substantial degradation of the buffer.
    [0008]
    8. Method according to claim 1, characterized in that a third rupture disc of the third rupture disc unit initially isolates a high pressure chamber (76), and in which fluid in the high pressure chamber maintains the member movable in an initial position, optionally, where the step of driving the third rupture disc unit further comprises the step of draining fluid from the high pressure chamber and thereby moving the movable member in contact with at least part of the cover, still optionally, in which the step of moving the movable member additionally includes sliding a sleeve (70) longitudinally along the passage and removing the cover from the passage.
    [0009]
    9. Apparatus for use in an underground well bore and to remove a degradable plug from a passage extending along a tubular bore below, the degradable plug to block fluid flow through the passage, apparatus characterized by the fact that comprises: a fluid chamber (42) having a degradation fluid in it to degrade the buffer (50); a cover (56) protecting the fluid plug; a first electronic rupture disc unit (66) having a first rupture disc (40) to selectively block the flow from the fluid chamber; a second electronic rupture disc unit (68) having a second rupture disc (106) to selectively block the flow of the degradation fluid in contact with the degradable buffer; and a movable member (46) operable to remove the cover (56) from the passage (48), wherein the movable member is retained in an initial position by a high pressure fluid in a high pressure chamber (76) and further comprising a third electronic rupture disc unit (80) having a third rupture disc (114) to selectively block the flow of high pressure fluid from the high pressure chamber.
    [0010]
    Apparatus according to claim 9, characterized by the fact that the degradable buffer is initially fluidically isolated.
    [0011]
    Apparatus according to either of claims 9 or 10, characterized in that at least one of the first and second rupture discs selectively blocks the flow through a fluid diversion (60) extending between the plug and the fluid chamber.
    [0012]
    12. Method for removing a degradable barrier plug (50) positioned to block fluid flow through a passage (48) in a downhole tubular positioned in an underground well hole, the degradable barrier plug isolated from the passage fluid by at least one cover (56), the method characterized by the fact that it comprises the steps of: driving a first electronic rupture disc unit (66) to open a fluid diversion (60) for the degradable buffer; degrade the degradable barrier buffer; and then drive a second electronic rupture disc unit (80) to allow a movable member (46) to remove at least part of the cover outside the passageway.
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    WO2014035420A1|2014-03-06|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-11-24| B09A| Decision: intention to grant|
    2021-01-05| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/US2012/053448|WO2014035420A1|2012-08-31|2012-08-31|Electronic rupture discs for interventionless barrier plug|
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