EP3247870B1 - Gehäuseentfernungswerkzeug und verfahren zur bohrlochauflassung - Google Patents

Gehäuseentfernungswerkzeug und verfahren zur bohrlochauflassung Download PDF

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Publication number
EP3247870B1
EP3247870B1 EP16740605.7A EP16740605A EP3247870B1 EP 3247870 B1 EP3247870 B1 EP 3247870B1 EP 16740605 A EP16740605 A EP 16740605A EP 3247870 B1 EP3247870 B1 EP 3247870B1
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EP
European Patent Office
Prior art keywords
casing
wellbore
removal tool
tool
casing removal
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.)
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EP16740605.7A
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English (en)
French (fr)
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EP3247870A1 (de
EP3247870A4 (de
Inventor
Michael C. Robertson
Antony F. Grattan
Douglas J. Streibich
William F. Boelte
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Robertson Intellectual Properties LLC
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Robertson Intellectual Properties LLC
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Publication date
Priority claimed from US14/930,369 external-priority patent/US10246961B2/en
Application filed by Robertson Intellectual Properties LLC filed Critical Robertson Intellectual Properties LLC
Priority claimed from PCT/US2016/013957 external-priority patent/WO2016118525A1/en
Publication of EP3247870A1 publication Critical patent/EP3247870A1/de
Publication of EP3247870A4 publication Critical patent/EP3247870A4/de
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    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/02—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means

Definitions

  • PCT patent cooperation treaty
  • the present application relates, generally, to the field of downhole tools. More particularly, the application relates to methods and tools for removing casing from a wellbore, which can be usable for the abandonment, or partial abandonment, of the well.
  • Abandoning a well involves sealing the intervals of the well to prevent the migration of oil, gas, brine and other substances into freshwater and preventing the migration of water or other contaminants into the oil and gas reservoirs.
  • a wellbore is very often drilled to depths many thousands of feet from the surface.
  • the resulting disruption of geologic formations can cause contamination of otherwise useful fluid reserves when a fluid from one formation flows through the wellbore to a different formation.
  • Well owners and operators have long known of these potential risks, but have increasingly become aware of the changes that can occur within a wellbore over very long periods of time.
  • Past preferred methods of properly abandoning and preventing leakage between fluid reserves included placing cement plugs within the wellbore, across and on top of hydrocarbon bearing or aquifer zones. That cement placement forms a long-term seal and isolation of the formations of interest.
  • the interval to be cemented may be up to several hundred feet in length.
  • the wellbore may include fissures running on the outside of the outermost casing. Leakage between formations may thus occur on the outside of the casing even if the inside of the casing is sealed by a cement plug.
  • the industry has increasingly become aware of the need to remove the casing entirely from within wellbore. When the casing is completely removed, the cement plug directly contacts the formation. Using existing equipment, operators generally remove the outermost casing using mechanical milling techniques; however, there are many drawbacks to the milling process. The operation is slow and may take a month or more to complete. The contaminated metal cuttings of the casing must be returned to the surface for processing and disposal. The milling drill must be large and powered by heavy rigs at the surface of the wellbore.
  • perforation of the casing Alternatively to milling the casing, some abandonment projects consider perforation of the casing to be adequate. Operators typically use explosive perforating techniques to form holes in the casing throughout the zone(s) to be plugged. As known in the art, a perforating gun containing a series of shaped charges is lowered into the wellbore and the charges are ignited through electrical or mechanical means. The perforations provide a flow-path for cement between the interior of the casing and the annulus.
  • cement squeeze is a technique in which the cement is highly pressurized as it is forced into the wellbore. The pressurization is believed to ensure that cement fills any and all cracks in the casing or surrounding formation.
  • a cement squeeze may be especially employed in wellbores which have multiple layers of piping and/or casing. That is, the inner tube string(s) may be perforated with a perforating gun and cement squeezed into the area. The cement is forced through the perforations in the inner tube string and fills the annulus between the inner tube string and the outer casing layer.
  • cement hardens on both sides of the casing, ostensibly sealing that zone of the wellbore.
  • Long term studies of wellbores have revealed, however, that after a few years the casing itself starts to deteriorate. In many circumstances, a deteriorating casing leaves fissures through which fluids may leak. Even a properly implemented cement squeeze does not address the problem of casing deterioration. Furthermore, cement squeeze techniques typically still require heavy equipment capable of producing the high pressures.
  • U.S. Patent Application Publication No. 2012/0199340 A1 discloses a torch apparatus for consuming a material having a fuel load that produces heat and a source of oxygen when burned.
  • the apparatus has a plurality of slots having interstitial spaces therebetween for allowing longitudinal flow of fluid along the torch apparatus without interfering with the flow of fluid through the individual slots.
  • the present application relates, generally, to methods and tools for removing casing from a wellbore, which can be usable for the abandonment, or partial abandonment, of the well.
  • the present application includes a casing removal tool for a rigless removal of a portion of a wellbore casing from a wellbore as defined in claim 1, that includes a tubular body configured to contain a thermite fuel mixture configured to initiate into a molten thermite fuel, and a nozzle array including a plurality of densely packed nozzles positioned on an external surface of the tubular body.
  • the nozzle array can be configured to impinge the molten thermite fuel onto a section of the wellbore casing so that the molten thermite fuel, from each of the nozzles in the plurality of nozzles, can at least partially overlap the molten thermite fuel from each adjacent nozzle in the plurality of nozzles.
  • the casing removal tool can further include an orientation lug configured to anchor into a downhole orientation tool.
  • the casing removal tool can have an orientation lug that can be configured to be set by an operator at a specific orientation before entering the wellbore.
  • the casing removal tool may include a second nozzle array that can be configured to impinge the molten thermite fuel onto a second section of the wellbore casing.
  • the casing removal tool in some embodiments, may have area of the nozzle array that takes up one quarter of a total area of the external surface. That area may include up to a 90° or more rectangular area, and the plurality of nozzles can be uniformly spaced within the rectangular area.
  • the casing removal tool in some embodiments, can include a spacer that can be configured to offset the nozzle array by a linear offset distance from the downhole orientation tool.
  • a centralizer can be configured to orient the casing removal tool relative to a radial center of the wellbore, and to maintain the casing removal tool in the center of the wellbore during operations.
  • the disclosed embodiments also include a method of removing casing from a wellbore with a casing removal tool, as defined in claim 9.
  • the steps of the method include lowering the casing removal tool into the wellbore and orienting the casing removal tool within the wellbore at a first linear orientation and a first azimuthal orientation.
  • the casing removal tool includes a tubular body configured to contain a thermite fuel mixture.
  • the steps of the method further include initiating a burn of the thermite fuel mixture to produce a molten thermite fuel, projecting the molten thermite fuel through a nozzle array that comprises a plurality of nozzles positioned adjacent to one another, and impinging the molten thermite fuel onto a section of the casing to melt, vaporize, and/or disintegrate the casing.
  • the molten thermite fuel, from each of the nozzles in the plurality of nozzles can at least partially overlap the molten thermite fuel from each adjacent nozzle in the plurality of nozzles to uniformly melt, vaporize or disintegrate a desired section (e.g., continuous section) of the casing.
  • the steps of the method can further include retrieving the casing removal tool from the wellbore.
  • the method can further include lowering an additional casing removal tool into the wellbore and orienting, while lowered into the wellbore, the additional casing removal tool within the wellbore.
  • the additional casing removal tool can be oriented at a combination of linear orientation and azimuthal orientation, which is different from the linear orientation and azimuthal orientation of any previously lowered casing removal tool.
  • the steps of the method can further include initiating a burn of the thermite fuel mixture within the additional casing removal tool to produce a molten thermite fuel and impinging the molten thermite fuel onto an additional section of the casing.
  • Each additional section of the casing is at least partially different from each previous section of the casing to which the molten thermite fuel is applied.
  • the method can include retrieving the additional casing removal tool from the wellbore before lowering a next additional casing removal tool.
  • the method includes lowering and setting a downhole orientation tool prior to lowering the casing removal tool.
  • Each of the casing removal tools is configured to linearly and azimuthally orient based on the downhole orientation tool.
  • the method includes lowering a spacer with each of the casing removal tools to linearly offset each of the casing removal tools from the downhole orientation tool.
  • the spacer may include a length to linearly position the casing removal tool relative to a zone of the casing, and the casing removal tool may remove at least a portion of the casing in the zone prior to adjusting the length of the spacer for the additional casing removal tool or the next additional casing removal tool.
  • Setting the downhole orientation tool may include perforating holes into the casing with a perforating torch and securing anchor dogs of the downhole orientation tool into the perforated holes, setting a sleeve hanger or a post-positioner with a setting tool, or combinations thereof.
  • orienting the casing removal tool further includes offsetting the casing removal tool from a radial center of the wellbore towards the casing.
  • the casing removal tool may be offset toward the section of the casing impinged by the molten thermite fuel.
  • lowering the casing removal tool into the wellbore includes using a wireline, a slickline, other rigless tool lowering strings, or combinations thereof.
  • Lowering and orienting the casing removal tool may include lowering and orienting the casing removal tool by attaching the casing removal tool to an end of a production tubing drill string.
  • the disclosed embodiments also describe and support a system for removing wellbore casing from a wellbore as defined in claim 7, that includes a downhole orientation tool configured to be secured within the wellbore, wherein the downhole orientation tool can have a linear and azimuthal orientation keyway, and a plurality of casing removal tools.
  • Each casing removal tool can include an orientation lug that can be configured to orient within the keyway of the downhole orientation tool. An operator can change a position of the orientation lugs before lowering the casing removal tools into the wellbore.
  • the system further includes a nozzle array having a plurality of densely packed nozzles configured to impinge molten thermite fuel onto a continuous section of the wellbore casing after the casing removal tool is lowered into the wellbore, and a spacer configured to offset the nozzle array a linear distance from the downhole orientation tool.
  • the system can include a second spacer configured to offset the nozzle array a second linear distance from the downhole orientation tool.
  • each casing removal tool, in the plurality of casing removal tools can include a nozzle array that is approximately 6 to 7 meters or more in length and about 90 degrees around an external surface of the casing removal tool.
  • the system can include a centralizer that is configured to orient the casing removal tool relative to a radial center of the wellbore, and maintain the casing removal tool centrally within the wellbore.
  • the system above includes small splinters of the wellbore casing that can be retrieved from the wellbore, removed from the wellbore, or allowed to fall down the wellbore.
  • the small splinters (e.g., small sections) of the wellbore casing are located between the continuous sections of the wellbore casing, onto which the molten thermite fuel is, or has been, projected.
  • the disclosed embodiments further include a method of removing casing from a wellbore as defined in claim 17, that includes lowering a casing removal tool into the wellbore through a first wellbore tubing having a first diameter, wherein the wellbore includes the first wellbore tubing and a second wellbore casing.
  • the steps of the method continue by including the lowering of the casing removal tool through the second wellbore casing, having a second diameter.
  • the second diameter is larger than the first diameter
  • the second wellbore tubing is downhole from the first wellbore tubing.
  • the steps of the method can further include orienting the casing removal tool within the second wellbore casing, initiating the casing removal tool to remove casing from the second wellbore casing, and retrieving the casing removal tool from the wellbore.
  • orienting the casing removal tool can include offsetting the casing removal tool from a radial center of the wellbore towards the casing. Also, orienting the casing removal tool may include anchoring the casing removal tool to an orientation tool that remains secured within the wellbore after the casing removal tool has been retrieved from the wellbore.
  • the methods and tools described herein use an exothermic, thermite reaction to controllably remove large, complete sections of casing or to penetrate the casing with holes of adequate size to provide a reliable flow-path for plugging/abandonment operations.
  • the methods and tools described herein are used to remove continuous and uniform sections of casing from the wellbore.
  • a casing removal tool is deployed into the cased wellbore.
  • casing removal tools may be employed to remove casing from the wellbore. Each of which may have a small cross-sectional diameter such that the casing removal tool may be lowered through tubing of a narrow width and remove casing from tubing at a wider width.
  • the casing removal tool may include, for example, thermite that may be initiated and projected upon the casing.
  • the molten thermite impinges onto the steel casing and melts, vaporizes, and/or disintegrates the casing.
  • the destruction of the casing is caused both by the heat of the molten thermite and by the pressure (e.g., jet) of the thermite exiting the casing removal tool.
  • the molten thermite and casing typically fall downward within the wellbore immediately after the reaction has completed.
  • Figure 1 illustrates an embodiment of a casing removal tool 100 deployed within an interval 101 of a wellbore.
  • the interval 101 of the wellbore may be located downhole from a narrow production tubing.
  • the casing removal tool 100 is shown as relatively close in width to the casing, but in certain embodiments the casing removal tool 100 may be narrower than the interval 101 of the casing being removed.
  • the casing removal tool 100 is small enough to fit through the narrow production tubing because the techniques disclosed herein are compact and do not require the use of a rig to power the removal of the casing.
  • the casing removal tool is used with a wireline, a slickline, other rigless tool lowering strings, or combinations thereof to deploy the casing removal tool, fire, and retrieve the casing removal tool before a typical rig could even be transported to the wellbore.
  • the casing removal tool 100 includes a tubular body 102 and a focused nozzle array 103.
  • the tubular body 102 contains solid thermite fuel.
  • the solid thermite fuel may be located within the tubular body 102 adjacent the nozzle array 103, or may occupy internal space within the tubular body 102 for several meters above or below the nozzle array 103.
  • the nozzle array 103 is an area of an external surface 108 of the casing removal tool 100 that includes a plurality of nozzles 104.
  • the area of the nozzle array 103 may vary in size (e.g., length, width, and/or shape).
  • the nozzle array may be about 6.1 meters (twenty (20) feet) in length but the tubular body 102 that houses the fuel may be about 3.0, 6.1, 9.14, 12.19 meters or more (about 10, 20, 30, 40 or more feet) in length.
  • molten thermite is expelled through the nozzles 104 of the nozzle array 103.
  • the focused nozzle array 103 is illustrated in more detail in Figure 2 .
  • the plurality of nozzles 104 provide a path for molten thermite contained on the inside of tubular body 102.
  • the nozzles can be less than an inch in diameter and can be less than half-inch in diameter. According to some embodiments, the nozzles can be about 4.5 mm (about 3/16 inches) in diameter. However, any diameter of nozzle is within the scope of the disclosure.
  • the focused nozzle array 103 can be densely packed with nozzles 104.
  • Densely packed nozzles 104 means that the nozzle array 103 has nozzles 104 in which the projection of molten thermite from each nozzle 104 at least partially overlaps the projection of molten thermite from each adjacent nozzle 104.
  • the result from such a nozzle array 103 is a uniform annihilation of a continuous section of the casing in front of the nozzle array 103.
  • a densely packed nozzle array 103 may have an area that is more than fifty percent (50%) occupied with nozzles 104.
  • the area within the nozzle array 103 that is occupied by a nozzle 104 is greater than the area within the nozzle array 103 that is between the nozzles 104.
  • the nozzles 104 are about 4.5 mm (about 3/16 inches) in diameter
  • the nozzles 104 are also spaced about 4.5 mm (about 3/16 inches) from each other.
  • the casing removal tool 100 provides a hole in the casing that is roughly the same size and shape of the nozzle array 103, rather than providing discrete holes corresponding to each nozzle 104. For example, if the nozzle array 103 is 25.4 mm (2 inches) wide and 6.1 meters (20 feet) long, the casing removal tool 100 will provide a 25.4 mm (2 inch) by 6.1 meters (20 foot) hole in the casing.
  • tubular body 102 For removing casing over a long interval, a longer tubular body 102 is desirable. Any length of tubular body 102 is within the scope of the disclosure. However, practical considerations, such as issues with uniformly initiating the solid thermite fuel, may limit the length of the tubular body 102 to about 15.24 meters or less (about fifty (50) feet or less), for example.
  • the embodiment illustrated in Figure 1 has a tubular body 102 that is about 6.1 meters (20 feet) in length.
  • the nozzle array 103 may cover any radial area the circumference of the tubular body 102.
  • nozzles 104 may be distributed upon a 360° area of tubular body 104.
  • the casing removal tool 100 removes an entire longitudinal section of the casing with a single deployment and initiation. More generally, however, the nozzle array 103 covers less than the entire circumference of the tubular body 102.
  • the nozzle array 103 may cover a 90° area of the tubular body 102.
  • four deployments of the casing removal tool 100 is needed to remove a continuous interval of casing, with each deployment having the nozzle array 103 rotated along a different 90° section of casing to remove the entire 360° of casing.
  • the nozzle array 103 may include a 360° ring around the external surface 108 of the casing removal tool 100.
  • a liner orientation tool 105 may be secured or set within the wellbore.
  • the orientation tool 105 may include a keyway 106 for engaging with a location/orientation lug 107 on the casing removal tool 100.
  • the orientation lug 107 may be adjusted by an operator at the surface of the wellbore to change the azimuthal angle at which the orientation lug 107 interacts with the keyway 106, changing the section at which the casing removal tool 100 impinges.
  • the orientation tool remains fixed in the wellbore and allows multiple deployments and orientations of the casing removal tool 100.
  • An embodiment of a liner orientation tool 105 is illustrated in more detail in Figure 3 .
  • the liner orientation tool 105 comprises a positioning sleeve 201 configured with spring-loaded anchor dogs 202. As the liner orientation tool is deployed, the anchor dogs 202 are held in a retracted position by the inside diameter of casing 203. When the liner orientation tool encounters appropriately spaced anchor holes 204 within the casing, the anchor dogs 202 can extend and engage within the anchor holes 204.
  • orientation tool 105 can be secured in place using a setting tool that forces teeth or dogs against the casing itself.
  • orientation tools 105 may include sleeve hangers (illustrated, for example, by positioning sleeve 201), or may include post-positioners where the casing removal tool 100 slips around the exterior of a post that has been secured within the wellbore. A post-positioner will often be positioned below the area of casing that is being targeted for removal.
  • the orientation tool 105 can comprise a first plurality of grooves, which define a first selected profile that is defined by a selected spacing of the first plurality of grooves.
  • the casing removal tool comprising a first plurality of protruding members
  • the first plurality of protruding members can be positioned and locked into place within the wellbore by the first plurality of protruding members forming a first complementary profile that is configured to lock only within the first selected profile of the orientation tool, thus positioning and locking the casing removal tool into place within the wellbore.
  • This embodiment is further described in relation to figure 10 .
  • the liner orientation tool 105 can be used to anchor multiple modular deployments of casing removal tools 100, assuring that the casing removal tools each return to the desired depth within the wellbore each time and align in the correct orientation.
  • the casing removal tools 100 as illustrated in Figure 1 , can be used to remove a 6.1 meter (20-foot) section of casing.
  • the nozzle array 103 covers a 6.1 meter (20 foot) length of the casing removal tool 100 and covers a 90° radial area.
  • changing the azimuthal orientation of the casing removal tool 100 over four separate deployments enables 360° removal of that section of casing.
  • this method of use would require four different casing removal tools 100, as each tool may be consumed once the thermite is initiated.
  • Each casing removal tool has a location/orientation lug 107 positioned to engage with the keyway 106 of the liner orientation tool 105. Since the keyway 106 of the liner orientation tool 105 remains in a constant radial/azimuthal orientation (i.e., it does not shift within the wellbore), the location/orientation lugs 107 of each of the four different casing removal tools 100 are indexed to a different position about the circumference of the casing removal tool, with respect to the nozzle array 103. Specifically, each of the location/orientation lugs 107 are positioned, such that the casing removal tool 100 orients to such that the nozzle array 103 covers a different 90° quadrant of the casing with each deployment.
  • Figure 4 illustrates a second deployment of the casing removal tool 100.
  • the casing removal tool 100 has been indexed to a second position 90° rotated from the first position.
  • a casing removal tool 100 may be required. This will be dependent on casing size, wall thickness and overall volume that can be reliably removed per thermite system deployed. For example, a larger or thicker casing might require more sustained contact with the molten thermite fuel. In such a case, a casing removal tool 100, having a nozzle array 103 covering an area of 60° instead of 90°, might be used, thus requiring six deployments. Alternatively, the casing removal tools 100 may be deployed in such a way that the radial areas, swept by the nozzle array 103 during each subsequent deployment, overlap somewhat.
  • the radial or azimuthal orientation of the casing removal tool within the wellbore is determined by indexing the position of the location/orientation lug 107 with respect to the nozzle array 103 on each of the casing removal tools 100.
  • the casing removal tool 100 may be oriented away relative to a radial center of the wellbore through centralizers positioned along the casing removal tool 100.
  • the centralizers may be located next to the orientation tool 105, or may be integrated such that the
  • casing lengths of about 183 meters (600 feet) and greater can be removed using casing removal tools 100 that are about 3 meters (20 feet) in length by simply repeating the process described above and stepping the casing removal tool 100 to a different vertical location within the wellbore as the previous vertical section is removed.
  • Figure 5 illustrates a casing removal tool 100 offset from the liner orientation tool 105 by a spacer 501.
  • the spacer 501 may be used for each casing removal tool 100 until all of the casing is removed from that "zone."
  • a zone of casing means the entire circle of casing for a length of the wellbore equal to one length of the casing removal tool. As explained above, the zone may be about 3 meters (20 feet) or more depending on the size of the nozzle array 103.
  • the casing removal tool 100 is illustrated in the first indexed position in FIG. 5 . Assuming that the nozzle array 103 covers a 90° radial area, as described above, four deployments of a casing removal tool 100 (each with a different 90° indexing) would be needed to remove all of the casing from Zone 1. Once the casing is entirely removed from Zone 1, the length of the spacer 501 can be decreased to allow removal from Zone 2. The process can then be repeated for Zones 3 and 4.
  • the liner orientation tool 105 can be positioned at the most upper section of the wellbore where casing is to be removed.
  • the first section of casing removed is typically lowermost portion of the overall interval so that falling slag and by-products from the removal process does not complicate removal of subsequent sections.
  • Each zone may require a single deployment or multiple azimuthally indexed deployments to complete the removal process.
  • the liner orientation tool 105 allows for modular deployments of a casing removal tool 100 to remove sections of casing at multiple radial angles at a given depth within a wellbore and also at different depths within a wellbore.
  • Figure 6 illustrates a process for cutting anchor holes 204 in casing 203 using a four-way perforating torch 601.
  • the four-way perforating torch uses molten thermite fuel ejected through nozzles 602 to cut holes 204 in the casing 203.
  • the four-way perforating torch 601 can be deployed via a tool string 603, for example. Examples of four-way perforating torches 601, as well as other suitable torches are available from MCR Oil Tools (Arlington, TX).
  • Figures 7A-7C illustrate an alternative method of deploying the liner orientation tool 105, wherein the four-way perforating torch 601 and the liner orientation tool 105 are both deployed on the same tool string 603 in a single trip.
  • the liner orientation tool 105 is positioned above the four-way perforating torch 601 during the run in hole configuration with the four anchor dogs 202 in a retracted position but with their spring force acting on the ID of the casing.
  • the four-way perforating torch 601 is initiated and creates the four anchor holes at 90° orientation. Once the anchor holes 204 are cut, the tool string 603 is lowered and the spring loaded anchor dogs 202 are allowed to seek and locate the anchor holes 204 ( Figure 7B ).
  • Over-pull is then applied to verify that the liner orientation tool 105 is anchored. Additional over-pull is applied to shear a predetermined weak point, freeing the four-way perforating torch 601 and tool string 603 from the liner orientation tool 105.
  • Figure 7C illustrates the process whereby the tool string 603 and four-way perforating torch 601 are retrieved from the wellbore leaving the liner orientation tool 105 in position. It should be noted that the liner orientation tool 105 could also be configured below the four-way perforating torch 601 on the tool string 603.
  • Figure 8 illustrates another embodiment whereby the casing removal tool 801 is provided with a slot pattern of multiple nozzle arrays 802 within one tool configuration.
  • Each nozzle array 802 contains a plurality of densely-packed nozzles that impinge on a continuous section of the wellbore casing, as described in detail above.
  • the casing removal tool 801 provides a series of predetermined slots or holes in the well casing so that the cement barrier material can be easily and adequately displaced all around the casing without the need for high-pressure circulation.
  • the same liner orientation tool 105 can be utilized for depth positioning within the wellbore and tool anchoring. Generally, the casing removal tool 801 does not need the indexing capability described above.
  • Figure 9 illustrates another embodiment of a casing removal tool 901 similar to 801, but wherein the slot pattern is a spiral or helical arrangement of nozzle arrays 902.
  • the same liner orientation tool 105 can be used to achieve depth positioning within the wellbore and tool anchoring; although in this application, it is not necessary to utilize the indexing capability.
  • Possible techniques for utilizing the casing removal tools 801, 901 that have multiple nozzle arrays include making several linear deployments without changing the azimuthal orientation. By changing only the linear orientation, an operator leaves strips of casing lengthwise along the wellbore. After the strips have been cut into the wellbore, additional 360° horizontal deployments may be used to cut the top and the bottom of the strips of remaining casing, creating splinters of free-floating casing.
  • splinters may fall down the wellbore without any further interaction.
  • the splinters remain fixed to cement and/or geologic formation behind the casing.
  • a fluid wash may be used to agitate the splinters and any remaining cement from the wellbore. This creates a wellbore that is similar to a just-drilled wellbore, which may enable greater fixation of the cement plug for abandonment.
  • the casing removal tools disclosed herein use an exothermic reaction of thermite (or a modified thermite mixture) fuel to remove casing material.
  • the thermite fuel may be in any form, but is typically loaded into the casing removal tool as solid pellets.
  • the thermite can include pressed pellets of a powdered (or finely divided) metal and a powdered metal oxide.
  • the powdered metal can be aluminum, magnesium, etc.
  • the metal oxide can include cupric oxide, iron oxide, etc.
  • a particular example of the thermite mixture is cupric oxide and aluminum.
  • thermite material produces an exothermic reaction.
  • the thermite material may also contain one or more gasifying compounds, such as one or more hydrocarbon or fluorocarbon compounds, particularly polymers.
  • the tubular body 102 of the casing removal tools described herein may be adapted to withstand the exothermic reaction of the thermite mixture.
  • it may be configured with a reaction-resistant coating, such as graphite or another material.
  • the thermite fuel load disposed within the tubular body 102 will generally be cylindrical in shape.
  • the thermite fuel load is initiated along the center of the longitudinal axis of the fuel load.
  • the fuel load reacts from the inside out.
  • An advantage of that reaction geometry is that the material closes to the inner diameter (ID) of the tubular body 102 is the last material to react; and therefore, this material provides some thermal insulation against the proceeding exothermic reaction. That thermal insulation, as set forth above, can help maintain structural integrity of the tool during the course of the reaction.
  • ID inner diameter
  • an off-center initiation provides increased expulsion velocity through the nozzle array.
  • Figure 10 illustrates an alternative embodiment of an orientation tool 1005 that is set within the wellbore.
  • the orientation tool 1005 includes lower cones 1001 and upper cones 1002 that squeeze a sealing member 1003, maintaining a fluid-tight seal.
  • Upper slips 1007 and lower slips 1009 are likewise forced into position and maintain the cones 1001, 1002 in position by biting into the wellbore with teeth.
  • Orientation tools such as the orientation tool 1005 illustrated in Figure 10
  • the setting tool can carry the orientation tool 1005 to the desired location within the wellbore.
  • a setting tool is typically connected to the orientation tool, and the setting tool and orientation tool are run down the wellbore using a slickline, wireline, coiled tubing, or other conveying method.
  • the setting tool typically includes a sleeve that rides on the outside 1011 of a mandrel 1013 and applies push force to the slips 1007.
  • the setting tool also typically engages a mandrel 1013 by a threaded connection or by a shear stud, for example, allowing the setting tool to apply pull force to the mandrel 1013.
  • the setting tool deploys the orientation tool 1005 by actuating forces onto the upper slips 1007, which force is conveyed to the lower cones 1001, upper cones 1002, sealing member 1003, and lower slips 1009.
  • Figure 10 illustrates that the orientation tool 1005 includes a cone 1015 that contains an inside diameter profile 1017, with a groove or a plurality of grooves 1019 into which a complementary projected profile of the casing removal tool 100 may engage. While Figure 10 depicts grooves 1019 for mechanical engagement with complementary protrusions of an apparatus and/or string, it should be understood that in various embodiments, the grooves 1019, and/or the complementary protrusions for engagement therewith, can include one or more magnets for providing magnetic adhesion, and/or one or more chemicals (e.g., adhesives, epoxies, or similar substances) to provide a chemical adhesion.
  • one or more magnets for providing magnetic adhesion
  • chemicals e.g., adhesives, epoxies, or similar substances
  • FIG 11 illustrates an embodiment of an orientation tool 1105 that utilizes a post-positioner 1107.
  • the orientation tool 1105 can be set with a setting tool in a similar manner as described above with regard to figure 10 .
  • the casing removal tool 100 may be lowered onto a post area 1109 and secured to a post head 1111.
  • the post head 1111 is located at the distal end of a post 1113 which may be a few centimeters to a meter or more in length.
  • the post head 1111 includes an orientation nub 1115 which the casing removal tool 100 may orient by in a reversal of roles to the keyway 106 and orientation lug 107 described above.
  • the post head 1111 may also include a complementary profile that fits into grooves (e.g., grooves 1019) as described above in regards to figure 10 .

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Claims (18)

  1. Gehäuseentfernungswerkzeug (100) für eine Entfernung eines Teils eines Bohrlochgehäuses ohne Vorrichtung aus einem Bohrloch, umfassend:
    einen rohrförmigen Körper (102), der so konfiguriert ist, dass er ein Thermit-Brennstoffgemisch enthält, das so konfiguriert ist, dass es in einen geschmolzenen Thermit-Brennstoff eingeleitet wird;
    eine Düsenanordnung (103), gekennzeichnet durch und umfassend eine Vielzahl von dicht gepackten Düsen (104), die in Reihen und Spalten auf einem Bereich einer äußeren Oberfläche (108) des rohrförmigen Körpers (102) angeordnet sind, wobei die Düsenanordnung (103) so konfiguriert ist, dass der geschmolzene Thermit-Brennstoff auf einen Abschnitt des Bohrlochgehäuses auftrifft, sodass der geschmolzene Thermit-Brennstoff aus jeder Düse der Vielzahl von dicht gepackten Düsen (104) den geschmolzenen Thermit-Brennstoff aus jeder benachbarten Düse (104) der Vielzahl von dicht gepackten Düsen (104) zumindest teilweise überlappt, um den Abschnitt des Bohrlochgehäuses gleichmäßig zu zerstrahlen; und
    eine Ausrichtungsnase (107), die zur Verankerung in einem Bohrlochausrichtungswerkzeug (105) konfiguriert ist.
  2. Gehäuseentfernungswerkzeug nach Anspruch 1, umfassend eine zweite Düsenanordnung, die so konfiguriert ist, dass der geschmolzene Thermit-Brennstoff auf einen zweiten Abschnitt des Bohrlochgehäuses auftrifft.
  3. Gehäuseentfernungswerkzeug nach Anspruch 1, wobei die Fläche der Düsenanordnung (103) ein Viertel der Gesamtfläche der äußeren Oberfläche (108) umfasst.
  4. Gehäuseentfernungswerkzeug nach Anspruch 3, wobei die Fläche der Düsenanordnung (103) bis zu einem rechteckigen Bereich von 90° oder mehr umfasst, wobei die Vielzahl von Düsen (104) innerhalb des rechteckigen Bereichs gleichmäßig beabstandet ist.
  5. Gehäuseentfernungswerkzeug nach Anspruch 1, umfassend einen Abstandshalter (501), der so konfiguriert ist, dass er die Düsenanordnung (103) um einen linearen Versatzabstand von dem Bohrlochausrichtungswerkzeug (105) versetzt.
  6. Gehäuseentfernungswerkzeug nach Anspruch 1, umfassend einen Zentrierer, der so konfiguriert ist, dass er das Gehäuseentfernungswerkzeug (100) relativ zu einer radialen Mitte des Bohrlochs ausrichtet.
  7. Gehäuseentfernungswerkzeug nach Anspruch 1, ferner umfassend:
    ein Bohrlochausrichtungswerkzeug (105), das so konfiguriert ist, dass es in dem Bohrloch befestigt werden kann, wobei das Bohrlochausrichtungswerkzeug (105) eine lineare und azimutale Ausrichtungskeilnut (106) umfasst, wobei das Gehäuseentfernungswerkzeug (100) die Ausrichtungsnase (107) umfasst, die so konfiguriert ist, dass sie in der Keilnut (106) des Bohrlochausrichtungswerkzeugs (105) ausgerichtet wird, und wobei ein Bediener eine Position der Ausrichtungsnase (107) ändern kann, bevor das Gehäuseentfernungswerkzeug (100) in das Bohrloch abgesenkt wird.
  8. System nach Anspruch 7, wobei das Bohrlochausrichtungswerkzeug (105) einen Hülsenhänger, einen Pfostenpositionierer (201) oder Kombinationen davon umfasst.
  9. Verfahren zum Entfernen von Gehäusen aus einem Bohrloch mit einem Gehäuseentfernungswerkzeug (100), umfassend:
    Absenken des Gehäuseentfernungswerkzeugs (100) in das Bohrloch;
    Ausrichten des Gehäuseentfernungswerkzeugs (100) innerhalb des Bohrlochs in einer ersten linearen Ausrichtung und einer ersten azimutalen Ausrichtung, wobei das Gehäuseentfernungswerkzeug (100) einen rohrförmigen Körper (102) umfasst, der so konfiguriert ist, dass er ein Thermit-Brennstoffgemisch enthält; und
    Auslösen einer Verbrennung des Thermit-Brennstoffgemisches zur Herstellung eines geschmolzenen Thermit-Brennstoffes;
    wobei das Verfahren gekennzeichnet ist durch und ferner umfasst: das Ausstoßen des geschmolzenen Thermit-Brennstoffs durch eine Düsenanordnung (103), die Reihen und Spalten einer Vielzahl von Düsen (104) umfasst, die dicht gepackt und innerhalb eines Bereichs auf einer Außenseite des Gehäuseentfernungswerkzeugs (100) angeordnet sind;
    Auftreffen des geschmolzenen Thermit-Brennstoffs auf einen Abschnitt des Gehäuses, um den Abschnitt des Gehäuses gleichmäßig zu zerstrahlen, wobei der geschmolzene Thermit-Brennstoff aus jeder Düse der Vielzahl von Düsen (104) den geschmolzenen Thermit-Brennstoff aus jeder benachbarten Düse (104) in der Vielzahl von Düsen (104) zumindest teilweise überlappt, um den Abschnitt des Bohrlochgehäuses gleichmäßig zu zerstrahlen; und
    Herausziehen des Gehäuseentfernungswerkzeugs (100) aus dem Bohrloch.
  10. Verfahren nach Anspruch 9, ferner umfassend:
    Absenken eines zusätzlichen Gehäuseentfernungswerkzeugs (100) in das Bohrloch;
    Ausrichten des zusätzlichen Gehäuseentfernungswerkzeugs (100) innerhalb des Bohrlochs, während es in das Bohrloch abgesenkt wird, wobei das zusätzliche Gehäuseentfernungswerkzeug (100) an einer Kombination aus linearer Ausrichtung und azimutaler Ausrichtung ausgerichtet ist, die sich von der linearen Ausrichtung und azimutalen Ausrichtung jedes zuvor abgesenkten Gehäuseentfernungswerkzeugs unterscheidet;
    Auslösen einer Verbrennung des Thermit-Brennstoffgemisches innerhalb des zusätzlichen Gehäuseentfernungswerkzeugs (100) zur Herstellung eines geschmolzenen Thermit-Brennstoffes;
    Auftreffen des geschmolzenen Thermit-Brennstoffs auf einen zusätzlichen Abschnitt des Gehäuses, um den zusätzlichen Abschnitt des Gehäuses gleichmäßig zu zerstrahlen, wobei sich jeder zusätzliche Abschnitt des Gehäuses zumindest teilweise von jedem vorherigen Abschnitt des Gehäuses unterscheidet; und
    Herausziehen des zusätzlichen Gehäuseentfernungswerkzeugs (100) aus dem Bohrloch, bevor ein nächstes zusätzliches Gehäuseentfernungswerkzeug abgesenkt wird.
  11. Verfahren nach Anspruch 10, umfassend das Absenken und Setzen eines Bohrlochausrichtungswerkzeugs (105) vor dem Absenken des Gehäuseentfernungswerkzeugs (100), wobei jedes der Gehäuseentfernungswerkzeuge (100) so konfiguriert ist, dass es sich linear und azimutal auf Grundlage des Bohrlochausrichtungswerkzeugs (105) ausrichtet.
  12. Verfahren nach Anspruch 11, umfassend das Absenken eines Abstandshalters (501) mit jedem der Gehäuseentfernungswerkzeuge (100), um jedes der Gehäuseentfernungswerkzeuge (100) von dem Bohrlochausrichtungswerkzeug (105) linear zu versetzen.
  13. Verfahren nach Anspruch 12, wobei der Abstandshalter (501) eine Länge aufweist, um das Gehäuseentfernungswerkzeug (100) relativ zu einer Zone des Gehäuses linear zu positionieren, und wobei das Gehäuseentfernungswerkzeug (100) zumindest einen Teil des Gehäuses in der Zone entfernt, bevor die Länge des Abstandshalters (501) für das zusätzliche Gehäuseentfernungswerkzeug oder das nächste zusätzliche Gehäuseentfernungswerkzeug eingestellt wird.
  14. Verfahren nach Anspruch 11, wobei das Setzen des Bohrlochausrichtungswerkzeugs (105) das Perforieren von Löchern (204) in das Gehäuse mit einer Perforierbrennvorrichtung (601) und das Befestigen von Ankernocken (202) des Bohrlochausrichtungswerkzeugs (105) in den perforierten Löchern (204), das Setzen eines Hülsenhängers oder eines Pfostenpositionierers (201) mit einem Setzwerkzeug oder Kombinationen davon umfasst.
  15. Verfahren nach Anspruch 9, wobei das Ausrichten des Gehäuseentfernungswerkzeugs (100) ferner das Versetzen des Gehäuseentfernungswerkzeugs (100) von einer radialen Mitte des Bohrlochs zum Gehäuse hin umfasst.
  16. Verfahren nach Anspruch 9, wobei das Absenken und Ausrichten des Gehäuseentfernungswerkzeugs (100) das Absenken und Ausrichten des Gehäuseentfernungswerkzeugs (100) durch Anbringen des Gehäuseentfernungswerkzeugs (105) an einem Ende eines Produktionsrohrbohrstrangs umfasst.
  17. Verfahren nach Anspruch 9, ferner umfassend:
    Absenken des Gehäuseentfernungswerkzeugs (100) in das Bohrloch durch eine erste Bohrlochverrohrung umfassend einen ersten Durchmesser, wobei das Bohrloch die erste Bohrlochverrohrung und ein zweites Bohrlochgehäuse umfasst;
    Absenken des Gehäuseentfernungswerkzeugs (100) durch das zweite Bohrlochgehäuse umfassend einen zweiten Durchmesser, wobei der zweite Durchmesser größer als der erste Durchmesser ist und die zweite Bohrlochverrohrung unterhalb der ersten Bohrlochverrohrung liegt;
    Ausrichten des Gehäuseentfernungswerkzeugs (100) innerhalb des zweiten Bohrlochgehäuses;
    Auslösen des Gehäuseentfernungswerkzeugs (100), um das Gehäuse aus dem zweiten Bohrlochgehäuse zu entfernen; und
    Herausziehen des Gehäuseentfernungswerkzeugs (100) aus dem Bohrloch.
  18. Verfahren nach Anspruch 17, wobei das Ausrichten des Gehäuseentfernungswerkzeugs (100) das Verankern des Gehäuseentfernungswerkzeugs (100) an einem Ausrichtungswerkzeug (105) umfasst, das innerhalb des Bohrlochs befestigt bleibt, nachdem das Gehäuseentfernungswerkzeug (100) aus dem Bohrloch herausgezogen wurde.
EP16740605.7A 2015-01-19 2016-01-19 Gehäuseentfernungswerkzeug und verfahren zur bohrlochauflassung Active EP3247870B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201562105130P 2015-01-19 2015-01-19
US14/930,369 US10246961B2 (en) 2012-07-24 2015-11-02 Setting tool for downhole applications
PCT/US2016/013957 WO2016118525A1 (en) 2015-01-19 2016-01-19 Casing removal tool and methods of use for well abandonment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022213168A1 (pt) * 2021-04-09 2022-10-13 Avibras Indústria Aeroespacial S.A. Formulações de termita bombeável com fase fluída energética e método para fechamento e abandono de poços de petróleo

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022213168A1 (pt) * 2021-04-09 2022-10-13 Avibras Indústria Aeroespacial S.A. Formulações de termita bombeável com fase fluída energética e método para fechamento e abandono de poços de petróleo

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