US20200392807A1 - Slips with internal buttons - Google Patents
Slips with internal buttons Download PDFInfo
- Publication number
- US20200392807A1 US20200392807A1 US16/442,282 US201916442282A US2020392807A1 US 20200392807 A1 US20200392807 A1 US 20200392807A1 US 201916442282 A US201916442282 A US 201916442282A US 2020392807 A1 US2020392807 A1 US 2020392807A1
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- United States
- Prior art keywords
- slip
- setting cone
- downhole tool
- button
- slips
- 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.)
- Abandoned
Links
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Images
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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/0422—Casing heads; Suspending casings or tubings in well heads a suspended tubing or casing being gripped by a slip or an internally serrated member
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
Definitions
- the present disclosure relates generally to parts used in downhole assemblies and, more particularly, to a slip with internal buttons for use in a downhole assembly.
- tubing or other pipe (e.g., casing) in the wellbore may be sealed at a particular location, such as for pumping cement or other fluids down the tubing, and forcing fluid out into a formation.
- Various downhole tools have been designed to effect this sealing or to isolate a particular zone of the wellbore.
- Many such downhole tools used for sealing a wellbore employ slips to contact casing in the wellbore with sufficient friction under pressure to hold the downhole tool in place and maintain the seal in the wellbore for the desired application.
- slips may be arranged around an exterior surface of a cylindrically-shaped downhole tool, and are pushed outward by a cone in the downhole tool that moves the slips to be in contact with a surface of the wellbore, such as the wall of the wellbore, or casing within a wellbore, when the downhole tool is set.
- Typical slips may be equipped with buttons on the exterior surface to increase the friction between the slip and the surface of the wellbore.
- Various types of downhole tools may also employ an elastomeric member and spherical element with a cone and slip arrangement to effect a seal in the wellbore, such as packers, bridge plugs, and frac plugs.
- the slips hold the elastomeric member of the frac plug in place against the wellbore when the frac plug is set and may enable the frac plug to withstand a certain amount of pressure or flow rate while maintaining the seal in the wellbore and holding the frac plug in place.
- Certain frac plugs may further be enabled to remain in the wellbore and held in place by slips during production from the well.
- a slip haying internal buttons may include an outer surface enabled to engage a wellbore surface, and an inner surface enabled to be engaged by a setting cone of a downhole tool.
- the inner surface may include at least one inner button enabled to contact the setting cone when the setting cone engages the inner surface.
- the outer surface may include at least one outer button enabled to contact the wellbore surface.
- the inner button may include a material that has a higher coefficient of friction than the coefficient of friction of the inner surface of the slip when in contact with the setting cone.
- the inner surface of the slip in the downhole tool may be parallel to the setting cone.
- an exposed surface of the inner button facing the setting cone may be non-parallel with the setting cone.
- the setting cone may include a metal and the inner button may include a non-metal.
- the inner button may include a composite material including at least one non-metal.
- the inner button may include a metal.
- the inner button may be substantially cylindrical in shape.
- the inner button may be shaped substantially as a polygonal prism.
- an exposed surface of the inner button that faces a surface of the setting cone may be non-parallel with the surface of the setting cone.
- an exposed surface of the inner button that faces a surface of the setting cone may be parallel with the surface of the setting cone.
- the wellbore surface may be a casing.
- a downhole tool may include a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set.
- the slips may further include an external surface enabled to engage a casing when the downhole tool is set, and an internal surface enabled to engage the setting cone when the downhole tool is set.
- at least one of the slips may further include the internal surface of the slip including at least one internal button enabled to contact the setting cone when the downhole tool is set.
- the external surface of the slip may include at least one exterior button enabled to contact the casing.
- the internal button may include a material that has a higher coefficient of friction than the coefficient of friction of the internal surface of the slip when in contact with the setting cone.
- the setting cone may include a metal
- the internal button comprises a non-metal
- the internal button may include a composite material including at least one non-metal.
- the internal button may include a metal.
- the internal surface of the slip may be parallel to the setting cone.
- an exposed surface of the internal button that faces a surface of the setting cone may be non-parallel with the surface of the setting cone.
- an exposed surface of the internal button that faces a surface of the setting cone may be parallel with the surface of the setting cone.
- the internal button may be substantially cylindrical in shape.
- the internal button may be shaped substantially as a polygonal prism.
- a method for engaging downhole tools in wellbores may include running a downhole tool to a depth in a casing.
- the downhole tool may include a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set.
- the method may further include setting the downhole tool in the casing, including causing the plurality of slips to engage a setting cone.
- the slips may further include an outer surface enabled to engage the casing when the downhole tool is set, and an inner surface enabled to engage the setting cone when the downhole tool is set.
- at least one of the slips may be an inner button slip that may further include the inner surface of the slip including at least one inner button.
- causing the plurality of slips to engage the setting cone may further include forcing the plurality of slips against the setting cone.
- the plurality of slips may include the at least one inner button slip, while the inner button may contact the setting cone as the plurality of slips engage the casing.
- the plurality of slips engaging the setting cone may further include at least one outer button located at the outer surface of the slip engaging the casing.
- the inner button may further include a material that has a higher coefficient of friction than the coefficient of friction of the inner surface of the slip when in contact with the setting cone.
- the setting cone may include a metal
- the inner button may include a non-metal
- the inner button may include a composite material including at least one non-metal. In any of the disclosed embodiments of the method, the inner button may include a metal.
- the inner surface of the slip may be parallel to the setting cone in the downhole tool.
- an exposed surface of the inner button that faces a surface of the setting cone may be non-parallel with the surface of the setting cone.
- an exposed surface of the inner button that faces a surface of the setting cone may be parallel with the surface of the setting cone.
- the inner button may be substantially cylindrical in shape.
- the inner button may be shaped substantially as a polygonal prism.
- FIG. 1 is a depiction of a frac plug having slips with internal buttons
- FIG. 2 is a partial sectional view of slip loading with an internal button
- FIG. 3 is a flow chart of a method using a slip with internal buttons
- FIG. 4A is a depiction of a frac plug having slips with internal buttons.
- FIG. 4B is a depiction of a frac plug having slips with internal buttons.
- a hyphenated form of a reference numeral refers to a specific instance of an element and the un-hyphenated form of the reference numeral refers to the element generically or collectively.
- device “12-1” refers to an instance of a device class, which may be referred to collectively as devices “12” and any one of which may be referred to generically as a device “12”.
- like numerals are intended to represent like elements.
- slips are parts in downhole tools, such as packers, bridge plugs, and frac plugs, among others, that may be used for anchoring against a surface of a wellbore, typically by using a cone-shaped member to force the slips against the surface of a wellbore.
- the gripping force that the slips are capable of exerting can be a key factor in the design and implementation of the downhole tool.
- the frictional performance of the slip may be determinative for the strength of the seal formed by the downhole tool and the amount of pressure that the seal and the downhole tool can withstand. Seals and downhole tools that can withstand higher pressures or higher flow rates are desirable because they enable wider ranges of operating conditions for well operators. Accordingly, slips having hard external or exterior buttons, such as ceramic buttons, have been used to improve the coefficient of friction between the slip and the casing, thereby improving the frictional force applied by the slip.
- a slip with internal buttons for use in a downhole assembly such as in a downhole tool
- the slip with internal buttons for use in a downhole assembly disclosed herein may enable an increased frictional force between the slip and a setting cone in a downhole tool, for example.
- the slip with internal buttons for use in a downhole assembly disclosed herein may enable an improved design for a downhole tool, such as by using a single setting cone with slips in the downhole tool instead of a pair of setting cones with respective pairs of slips, which may enable a substantially more compact downhole tool for a given frictional force, which is desirable.
- the slip with internal buttons for use in a downhole assembly disclosed herein may be implemented using a variety of materials for the slip body and or the internal buttons, as disclosed herein.
- FIG. 1 shows a portion of a frac plug 100 having slips 104 .
- FIG. 1 is a schematic diagram for descriptive purposes and is not drawn to scale or perspective.
- the depicted portion of frac plug 100 includes a setting cone 106 (or simply, cone 106 ).
- cone 106 may have a frustoconical shape.
- Frac plug 100 may operate to plug a wellbore, such as a cased wellbore having a casing diameter of 3.5 inches, 4 inches, 4.5 inches, or 5.5 inches, among other casing diameters. It will be understood that frac plug 100 may include other elements, such as additional sets of setting cones and corresponding slips, in various embodiments.
- frac plug 100 may include an elastomeric member that expands to seal the casing diameter when frac plug 100 is set in place.
- Frac plug 100 may be set in place by compressing frac plug 100 , such that slips 104 are engaged to firmly hold frac plug 100 in a particular location in a corresponding wellbore, such as within a casing of the wellbore.
- the frictional force of slips 104 pressing against the interior surface of the wellbore (or the casing) holds frac plug 100 in place in the set or “plugged” condition. Accordingly, the force that maintains the plug 100 in the set or plugged condition is achieved by virtue of the material strength of slips 104 as well as a frictional force between slips 104 and cone 106 .
- cone 106 is located adjacent to slips 104 , which may be a plurality of parts arranged axially next to each other and may be bound together with at least one ring clamp (not shown) prior to downhole introduction and engagement.
- slips 104 When slips 104 are forced against cone 106 in the direction given by arrow 120 (i.e., the frac plug is compressed), cone 106 works with appreciable force against an inner surface of each individual composite slip 104 , which may cause a ring clamp to fail and to release slips 104 . Because slips 104 are nonetheless contained in the downhole setting, slips 104 are forced outward to press against the wellbore or the casing.
- buttons 110 which may be embedded at an outer surface of slips 104 to provide increased friction and hardness to improve the securing of frac plug 100 by slips 104 .
- slips 104 may have internal (or inner) buttons (not visible in FIG. 1 , see FIGS. 2 and 4B ), as disclosed herein, that provide increased friction and hardness to improve the engagement of cone 106 against an internal (or inner) surface of slips 104 .
- slips 104 may incorporate slips 104 having internal buttons.
- FIG. 2 is a schematic diagram for descriptive purposes and is not drawn to scale or perspective.
- the operation of slip 104 being forced against cone 106 in direction given by arrow 120 is illustrated at one side of a casing 230 .
- cone 106 engages slip 104 with appreciable force and causes slip 104 to be forced towards casing 230 in direction 220 .
- an external button 110 may be used to improve engagement of slip 104 with casing 230 , such as by increasing friction or by mechanical deformation (not shown) of casing 230 .
- a cone surface 106 - 1 may engage with an angled surface 104 - 1 of slip 104 , which applies force to slip 104 in direction 220 .
- FIG. 2 Also shown in FIG. 2 is internal button 222 , located at angled surface 104 - 1 of slip 104 .
- Angled surface 104 - 1 may represent an internal or inner surface of slip 104 .
- angled surface 104 - 1 may be parallel to cone surface 106 - 1 that is designed to engage slip 104 at angled surface 104 - 1 .
- an angle of angled surface 104 - 1 may correspond to a cone angle ⁇ shown in FIG. 2 .
- internal button 222 is visible in a location at angled surface 104 - 1 for engagement by cone surface 106 - 1 . Accordingly, internal button 222 may improve the setting force that is applied to slip 104 , such as by increasing friction between slip 104 and cone 106 .
- internal button 222 may be formed from a material that has a higher coefficient of friction than angled surface 104 - 1 when in contact with setting cone 106 , such as a hard metal, a ceramic, a glass, a composite of non-metallic and metallic materials, or another composite material (such as a fiber-reinforced ceramic), among others, internal button 222 may enable an improved setting of the downhole tool or assembly, and may improve stability in operation, because of the increased frictional three that results from internal button 222 .
- a material that has a higher coefficient of friction than angled surface 104 - 1 when in contact with setting cone 106 such as a hard metal, a ceramic, a glass, a composite of non-metallic and metallic materials, or another composite material (such as a fiber-reinforced ceramic), among others.
- the ability of slip 104 to hold the downhole tool or assembly in place in operation may be improved, including the ability to stay in place at higher pressures or at higher flowrates in the wellbore.
- the downhole tool or assembly may be enabled to withstand high pressure, such as pressures of up to 8 kpsi (about 55 MPa), up to 10 kpsi (about 69 MPa), or up to 12 kpsi (about 83 MPa) within the wellbore.
- the downhole tool or assembly may be enabled to withstand high flow rates during production, such as such as up to 80 million standard cubic feet per day (MMSCFD) of gas or up to 4,000 barrels of oil per day (BOPD).
- MMSCFD standard cubic feet per day
- BOPD barrels of oil per day
- internal button 222 may accordingly enable a more compact design in a given downhole tool or assembly, such as by enabling the use of a single set of cone 106 /slips 104 instead of a plurality of sets, for example, to achieve the same downhole slip performance (see also FIGS. 4A and 4B ).
- external buttons 110 and internal button 222 may be formed as cylindrically shaped parts that are mounted in corresponding holes formed in slip 104 . Additionally, the exposed surfaces of external buttons 110 or internal button 222 or both may be non-parallel with their respective engaging surfaces, such that external buttons 110 or internal button 222 have an edge that can bite in the respective engaging surface when set to further increase frictional force. It is noted that in various embodiments, internal button 222 may cause at least some plastic deformation in cone 106 when set, such as an indentation that corresponds to the shape of internal button 222 and helps to hold internal button 222 , and also slip 104 , in place when set.
- cone 106 may be formed from a metal, such as steel, while internal button 222 may be formed from a hard material, such as a ceramic.
- a body of slip 104 may be formed from any of various materials, including metals or rubbers, resin, epoxy, or other polymers.
- the body of slip 104 may be a composite material having a matrix phase as noted with an inclusion phase that may include various inclusions, such as fibers, filaments, and particles, or various combinations thereof.
- slip 104 may be made using a filament-reinforced composite material, such as an epoxy with glass fiber filaments, among other types of composite matrix and inclusion combinations.
- the glass fiber is wound as a continuous filament on a mandrel from which individual parts for slip 104 may be cut.
- a filament-reinforced slip part is disclosed in U.S. patent application Ser. No. 15/981,592 titled “Filament Reinforced Composite Material with Load-Aligned Filament Windings” filed on May 16, 2018, which is hereby incorporated by reference.
- method 300 a flow chart of selected elements of an embodiment of a method 300 of using a slip with internal buttons, as disclosed herein. It is noted that certain operations described in method 300 may be optional or may be rearranged in different embodiments. In various embodiments, method 300 may be performed for various types of downhole tools, as described herein.
- Method 300 may begin at step 302 by running a downhole tool to a depth in a wellbore, where the downhole tool comprises a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set.
- the downhole tool is set in the wellbore, including causing the plurality of slips to engage the setting cone, and where at least one of the slips is an inner button slip.
- the plurality of slips are forced against the setting cone, including the at least one inner button slip, where the inner button contacts the setting cone as the outer surface of the plurality of slips engages the wellbore.
- FIGS. 4A and 4B a frac plug 400 having slips 404 is depicted in an external view and a sectional view, respectively.
- FIGS. 4A and 4B are schematic diagrams for descriptive purposes and are not drawn to scale or perspective.
- frac plug 400 is shown as a compact tool exhibiting a relatively low ratio of tool length to tool diameter and includes a frustoconical member 406 , which may be similar to or analogous to cone 106 described above with respect to FIGS. 1 and 2 .
- Frac plug 400 may operate to plug a wellbore, such as a cased wellbore having a casing diameter of 3.5 inches, 4 inches, 4.5 inches, or 5.5 inches, among other casing diameters. Frac plug 400 may be set in place by compressing frac plug 400 , such that slips 404 are engaged to firmly hold frac plug 400 in a particular location in a corresponding wellbore, such as within a casing of the wellbore.
- Frac plug 400 may be compressed for setting in place by forcing slips 404 against frustoconical member 406 in a direction given by arrow 420 .
- the frictional force of slips 404 pressing against the interior surface of the wellbore (or the casing) holds frac plug 400 in place in the set or “plugged” condition. Accordingly, the force that maintains frac plug 400 in the set or plugged condition is achieved by virtue of the material strength of slips 404 , as well as the friction between slips 404 and frustoconical member 406 .
- buttons 410 are also visible in FIGS. 4A and 4B , which are enabled to engage the casing when frac plug 400 is set.
- a sectional line on frac plug 400 - 1 indicates a sectional view 400 - 2 shown in FIG. 4B .
- FIG. 4B showing the sectional view 400 - 2 .
- internal buttons 422 and external buttons 410 are visible.
- internal buttons 422 are shown embedded within slip 404 and protrude from slip 404 .
- a slight non-parallel surface of internal buttons 422 resulting in an edge to cylindrically shaped internal buttons 422 that is enabled to engage with frustoconical member 406 when frac plug 400 is set (not shown), such as by biting into or otherwise deforming at least a portion of frustoconical member 406 .
- buttons 422 or external buttons 410 may be realized using different methods. As shown in FIG. 4B , internal buttons 422 are regular cylinders that are embedded in a hole that is drilled at a non-perpendicular angle to an inner surface 404 - 1 of slip 404 (see also inner surface 104 - 1 in FIG. 1 ). In other embodiments, internal buttons 422 or external buttons 410 may be cylindrical parts that are cut obliquely with a non-perpendicular surface at least one end, while the holes drilled in slip 404 are drilled perpendicular to inner surface 404 - 1 .
- buttons 422 or internal buttons 410 may be non-cylindrical in shape, such as having shapes of triangular prisms, square prisms, rectangular prisms, or other polygonal prisms (not shown).
- buttons 422 may increase the frictional force by which slip 404 is held in place by frustoconical member 406 when frac plug 400 is set, which may enable the relatively low ratio of tool length to tool diameter, such as by allowing frac plug 400 to have a single frustoconical member 406 , instead of a plurality of cones and a respective plurality of sets of slips.
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Abstract
A slip for use in a downhole tool that includes internal buttons on an internal surface of the slip that engages a setting cone. The internal buttons may be made of a hard material, such as a ceramic, among others, to increase the coefficient of friction between the slip and the cone when the downhole tool is set.
Description
- This application is related to the U.S. non-provisional utility patent application titled “COMPACT DOWNHOLE TOOL”, attorney docket number NSC100/4-013US, filed concurrently herewith and hereby incorporated by reference in its entirety herein.
- The present disclosure relates generally to parts used in downhole assemblies and, more particularly, to a slip with internal buttons for use in a downhole assembly.
- During drilling or reworking of wells, tubing or other pipe (e.g., casing) in the wellbore may be sealed at a particular location, such as for pumping cement or other fluids down the tubing, and forcing fluid out into a formation. Various downhole tools have been designed to effect this sealing or to isolate a particular zone of the wellbore. Many such downhole tools used for sealing a wellbore employ slips to contact casing in the wellbore with sufficient friction under pressure to hold the downhole tool in place and maintain the seal in the wellbore for the desired application.
- Multiple slips may be arranged around an exterior surface of a cylindrically-shaped downhole tool, and are pushed outward by a cone in the downhole tool that moves the slips to be in contact with a surface of the wellbore, such as the wall of the wellbore, or casing within a wellbore, when the downhole tool is set. Typical slips may be equipped with buttons on the exterior surface to increase the friction between the slip and the surface of the wellbore.
- Various types of downhole tools may also employ an elastomeric member and spherical element with a cone and slip arrangement to effect a seal in the wellbore, such as packers, bridge plugs, and frac plugs. In a frac plug, the slips hold the elastomeric member of the frac plug in place against the wellbore when the frac plug is set and may enable the frac plug to withstand a certain amount of pressure or flow rate while maintaining the seal in the wellbore and holding the frac plug in place. Certain frac plugs may further be enabled to remain in the wellbore and held in place by slips during production from the well.
- In one aspect, a slip haying internal buttons is disclosed. The slip may include an outer surface enabled to engage a wellbore surface, and an inner surface enabled to be engaged by a setting cone of a downhole tool. In the slip, the inner surface may include at least one inner button enabled to contact the setting cone when the setting cone engages the inner surface.
- In any of the disclosed embodiments of the slip, the outer surface may include at least one outer button enabled to contact the wellbore surface.
- In any of the disclosed embodiments of the slip, the inner button may include a material that has a higher coefficient of friction than the coefficient of friction of the inner surface of the slip when in contact with the setting cone.
- In any of the disclosed embodiments or the slip, the inner surface of the slip in the downhole tool may be parallel to the setting cone.
- In any of the disclosed embodiments of the slip, an exposed surface of the inner button facing the setting cone may be non-parallel with the setting cone.
- In any of the disclosed embodiments of the slip, the setting cone may include a metal and the inner button may include a non-metal. In the slip, the inner button may include a composite material including at least one non-metal. In the slip, the inner button may include a metal.
- In any of the disclosed embodiments of the slip, the inner button may be substantially cylindrical in shape.
- In any of the disclosed embodiments of the slip, the inner button may be shaped substantially as a polygonal prism.
- In any of the disclosed embodiments of the slip, an exposed surface of the inner button that faces a surface of the setting cone may be non-parallel with the surface of the setting cone.
- In any of the disclosed embodiments of the slip, an exposed surface of the inner button that faces a surface of the setting cone may be parallel with the surface of the setting cone.
- In any of the disclosed embodiments of the slip, the wellbore surface may be a casing.
- In another aspect, a downhole tool is disclosed. The downhole tool may include a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set. In the downhole tool, the slips may further include an external surface enabled to engage a casing when the downhole tool is set, and an internal surface enabled to engage the setting cone when the downhole tool is set. In the downhole tool, at least one of the slips may further include the internal surface of the slip including at least one internal button enabled to contact the setting cone when the downhole tool is set.
- In any of the disclosed embodiments of the downhole tool, the external surface of the slip may include at least one exterior button enabled to contact the casing.
- In any of the disclosed embodiments of the downhole tool, the internal button may include a material that has a higher coefficient of friction than the coefficient of friction of the internal surface of the slip when in contact with the setting cone.
- In any of the disclosed embodiments of the downhole tool, the setting cone may include a metal, and the internal button comprises a non-metal.
- In any of the disclosed embodiments of the downhole tool, the internal button may include a composite material including at least one non-metal. In the downhole tool, the internal button may include a metal.
- In any of the disclosed embodiments of the downhole tool, the internal surface of the slip may be parallel to the setting cone.
- In any of the disclosed embodiments of the downhole tool, an exposed surface of the internal button that faces a surface of the setting cone may be non-parallel with the surface of the setting cone.
- In any of the disclosed embodiments of the downhole tool, an exposed surface of the internal button that faces a surface of the setting cone may be parallel with the surface of the setting cone.
- In any of the disclosed embodiments of the downhole tool, the internal button may be substantially cylindrical in shape.
- In any of the disclosed embodiments of the downhole tool, the internal button may be shaped substantially as a polygonal prism.
- In yet another aspect, a method for engaging downhole tools in wellbores is disclosed. The method may include running a downhole tool to a depth in a casing. In the method, the downhole tool may include a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set. The method may further include setting the downhole tool in the casing, including causing the plurality of slips to engage a setting cone. In the method, the slips may further include an outer surface enabled to engage the casing when the downhole tool is set, and an inner surface enabled to engage the setting cone when the downhole tool is set. In the method, at least one of the slips may be an inner button slip that may further include the inner surface of the slip including at least one inner button. In the method, causing the plurality of slips to engage the setting cone may further include forcing the plurality of slips against the setting cone. In the method, the plurality of slips may include the at least one inner button slip, while the inner button may contact the setting cone as the plurality of slips engage the casing.
- In any of the disclosed embodiments of the method, the plurality of slips engaging the setting cone may further include at least one outer button located at the outer surface of the slip engaging the casing.
- In any of the disclosed embodiments of the method, the inner button may further include a material that has a higher coefficient of friction than the coefficient of friction of the inner surface of the slip when in contact with the setting cone.
- In any of the disclosed embodiments of the method, the setting cone may include a metal, while the inner button may include a non-metal.
- In any of the disclosed embodiments of the method, the inner button may include a composite material including at least one non-metal. In any of the disclosed embodiments of the method, the inner button may include a metal.
- In any of the disclosed embodiments of the method, the inner surface of the slip may be parallel to the setting cone in the downhole tool.
- In any of the disclosed embodiments of the method, an exposed surface of the inner button that faces a surface of the setting cone may be non-parallel with the surface of the setting cone.
- In any of the disclosed embodiments of the method, an exposed surface of the inner button that faces a surface of the setting cone may be parallel with the surface of the setting cone.
- In any of the disclosed embodiments of the method, the inner button may be substantially cylindrical in shape.
- In any of the disclosed embodiments of the method, the inner button may be shaped substantially as a polygonal prism.
- For a more complete understanding of the present disclosure and its features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a depiction of a frac plug having slips with internal buttons; -
FIG. 2 is a partial sectional view of slip loading with an internal button; -
FIG. 3 is a flow chart of a method using a slip with internal buttons; -
FIG. 4A is a depiction of a frac plug having slips with internal buttons; and -
FIG. 4B is a depiction of a frac plug having slips with internal buttons. - In the following description, details are set forth by way of example to facilitate discussion of the disclosed subject matter. It should be apparent to a person of ordinary skill in the field, however, that the disclosed embodiments are exemplary and not exhaustive of all possible embodiments.
- Throughout this disclosure, a hyphenated form of a reference numeral refers to a specific instance of an element and the un-hyphenated form of the reference numeral refers to the element generically or collectively. Thus, as an example (not shown in the drawings), device “12-1” refers to an instance of a device class, which may be referred to collectively as devices “12” and any one of which may be referred to generically as a device “12”. In the figures and the description, like numerals are intended to represent like elements.
- As noted above, slips are parts in downhole tools, such as packers, bridge plugs, and frac plugs, among others, that may be used for anchoring against a surface of a wellbore, typically by using a cone-shaped member to force the slips against the surface of a wellbore. The gripping force that the slips are capable of exerting can be a key factor in the design and implementation of the downhole tool. The frictional performance of the slip may be determinative for the strength of the seal formed by the downhole tool and the amount of pressure that the seal and the downhole tool can withstand. Seals and downhole tools that can withstand higher pressures or higher flow rates are desirable because they enable wider ranges of operating conditions for well operators. Accordingly, slips having hard external or exterior buttons, such as ceramic buttons, have been used to improve the coefficient of friction between the slip and the casing, thereby improving the frictional force applied by the slip.
- As will be disclosed in further detail herein, a slip with internal buttons for use in a downhole assembly, such as in a downhole tool, is disclosed. The slip with internal buttons for use in a downhole assembly disclosed herein may enable an increased frictional force between the slip and a setting cone in a downhole tool, for example. Accordingly, the slip with internal buttons for use in a downhole assembly disclosed herein may enable an improved design for a downhole tool, such as by using a single setting cone with slips in the downhole tool instead of a pair of setting cones with respective pairs of slips, which may enable a substantially more compact downhole tool for a given frictional force, which is desirable. The slip with internal buttons for use in a downhole assembly disclosed herein may be implemented using a variety of materials for the slip body and or the internal buttons, as disclosed herein.
- Referring now to the drawings,
FIG. 1 shows a portion of afrac plug 100 havingslips 104.FIG. 1 is a schematic diagram for descriptive purposes and is not drawn to scale or perspective. InFIG. 1 , the depicted portion offrac plug 100 includes a setting cone 106 (or simply, cone 106). In particular embodiments,cone 106 may have a frustoconical shape.Frac plug 100 may operate to plug a wellbore, such as a cased wellbore having a casing diameter of 3.5 inches, 4 inches, 4.5 inches, or 5.5 inches, among other casing diameters. It will be understood thatfrac plug 100 may include other elements, such as additional sets of setting cones and corresponding slips, in various embodiments. For example in some embodiments,frac plug 100 may include an elastomeric member that expands to seal the casing diameter whenfrac plug 100 is set in place.Frac plug 100 may be set in place by compressingfrac plug 100, such that slips 104 are engaged to firmly holdfrac plug 100 in a particular location in a corresponding wellbore, such as within a casing of the wellbore. The frictional force ofslips 104 pressing against the interior surface of the wellbore (or the casing) holdsfrac plug 100 in place in the set or “plugged” condition. Accordingly, the force that maintains theplug 100 in the set or plugged condition is achieved by virtue of the material strength ofslips 104 as well as a frictional force betweenslips 104 andcone 106. - As shown in
FIG. 1 , infrac plug 100,cone 106 is located adjacent toslips 104, which may be a plurality of parts arranged axially next to each other and may be bound together with at least one ring clamp (not shown) prior to downhole introduction and engagement. When slips 104 are forced againstcone 106 in the direction given by arrow 120 (i.e., the frac plug is compressed),cone 106 works with appreciable force against an inner surface of each individualcomposite slip 104, which may cause a ring clamp to fail and to release slips 104. Becauseslips 104 are nonetheless contained in the downhole setting, slips 104 are forced outward to press against the wellbore or the casing. Also shown areceramic buttons 110, which may be embedded at an outer surface ofslips 104 to provide increased friction and hardness to improve the securing offrac plug 100 byslips 104. As will be described in further detail, slips 104 may have internal (or inner) buttons (not visible inFIG. 1 , seeFIGS. 2 and 4B ), as disclosed herein, that provide increased friction and hardness to improve the engagement ofcone 106 against an internal (or inner) surface ofslips 104. - Although a
frac plug 100 is shown incorporatingslips 104, it will be understood that other types of downhole tools, such as bridge plugs, packers or other sealing devices, may incorporateslips 104 having internal buttons. - Referring now to
FIG. 2 , aslip loading 200 with aninternal button 222 is shown as a cross-sectional schematic diagram.FIG. 2 is a schematic diagram for descriptive purposes and is not drawn to scale or perspective. InFIG. 2 , the operation ofslip 104 being forced againstcone 106 in direction given byarrow 120 is illustrated at one side of acasing 230. As a result, as the slips move indirection 120,cone 106 engagesslip 104 with appreciable force and causes slip 104 to be forced towardscasing 230 indirection 220. At an outer surface ofslip 104, anexternal button 110 may be used to improve engagement ofslip 104 withcasing 230, such as by increasing friction or by mechanical deformation (not shown) ofcasing 230. Thus, ascone 106 is engaged whenfrac plug 100 is set, a cone surface 106-1 may engage with an angled surface 104-1 ofslip 104, which applies force to slip 104 indirection 220. - Also shown in
FIG. 2 isinternal button 222, located at angled surface 104-1 ofslip 104. Angled surface 104-1 may represent an internal or inner surface ofslip 104. In particular, angled surface 104-1 may be parallel to cone surface 106-1 that is designed to engageslip 104 at angled surface 104-1. It is noted that an angle of angled surface 104-1 may correspond to a cone angle φ shown inFIG. 2 . In particular,internal button 222 is visible in a location at angled surface 104-1 for engagement by cone surface 106-1. Accordingly,internal button 222 may improve the setting force that is applied to slip 104, such as by increasing friction betweenslip 104 andcone 106. Becauseinternal button 222 may be formed from a material that has a higher coefficient of friction than angled surface 104-1 when in contact with settingcone 106, such as a hard metal, a ceramic, a glass, a composite of non-metallic and metallic materials, or another composite material (such as a fiber-reinforced ceramic), among others,internal button 222 may enable an improved setting of the downhole tool or assembly, and may improve stability in operation, because of the increased frictional three that results frominternal button 222. As a result of this increased frictional force enabled byinternal button 222 at angled surface 104-1, the ability ofslip 104 to hold the downhole tool or assembly in place in operation may be improved, including the ability to stay in place at higher pressures or at higher flowrates in the wellbore. For example, the downhole tool or assembly may be enabled to withstand high pressure, such as pressures of up to 8 kpsi (about 55 MPa), up to 10 kpsi (about 69 MPa), or up to 12 kpsi (about 83 MPa) within the wellbore. Furthermore, the downhole tool or assembly may be enabled to withstand high flow rates during production, such as such as up to 80 million standard cubic feet per day (MMSCFD) of gas or up to 4,000 barrels of oil per day (BOPD). - In some instances,
internal button 222 may accordingly enable a more compact design in a given downhole tool or assembly, such as by enabling the use of a single set ofcone 106/slips 104 instead of a plurality of sets, for example, to achieve the same downhole slip performance (see alsoFIGS. 4A and 4B ). - As shown,
external buttons 110 andinternal button 222 may be formed as cylindrically shaped parts that are mounted in corresponding holes formed inslip 104. Additionally, the exposed surfaces ofexternal buttons 110 orinternal button 222 or both may be non-parallel with their respective engaging surfaces, such thatexternal buttons 110 orinternal button 222 have an edge that can bite in the respective engaging surface when set to further increase frictional force. It is noted that in various embodiments,internal button 222 may cause at least some plastic deformation incone 106 when set, such as an indentation that corresponds to the shape ofinternal button 222 and helps to holdinternal button 222, and also slip 104, in place when set. In some embodiments,cone 106 may be formed from a metal, such as steel, whileinternal button 222 may be formed from a hard material, such as a ceramic. It is noted that a body ofslip 104 may be formed from any of various materials, including metals or rubbers, resin, epoxy, or other polymers. In particular, the body ofslip 104 may be a composite material having a matrix phase as noted with an inclusion phase that may include various inclusions, such as fibers, filaments, and particles, or various combinations thereof. - In certain embodiments, slip 104 may be made using a filament-reinforced composite material, such as an epoxy with glass fiber filaments, among other types of composite matrix and inclusion combinations. In particular embodiments, the glass fiber is wound as a continuous filament on a mandrel from which individual parts for
slip 104 may be cut. One example of a filament-reinforced slip part is disclosed in U.S. patent application Ser. No. 15/981,592 titled “Filament Reinforced Composite Material with Load-Aligned Filament Windings” filed on May 16, 2018, which is hereby incorporated by reference. - Referring now to
FIG. 3 , a flow chart of selected elements of an embodiment of amethod 300 of using a slip with internal buttons, as disclosed herein. It is noted that certain operations described inmethod 300 may be optional or may be rearranged in different embodiments. In various embodiments,method 300 may be performed for various types of downhole tools, as described herein. -
Method 300 may begin atstep 302 by running a downhole tool to a depth in a wellbore, where the downhole tool comprises a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set. Atstep 304, the downhole tool is set in the wellbore, including causing the plurality of slips to engage the setting cone, and where at least one of the slips is an inner button slip. Atstep 306, the plurality of slips are forced against the setting cone, including the at least one inner button slip, where the inner button contacts the setting cone as the outer surface of the plurality of slips engages the wellbore. - Referring now to
FIGS. 4A and 4B , a frac plug 400 havingslips 404 is depicted in an external view and a sectional view, respectively.FIGS. 4A and 4B are schematic diagrams for descriptive purposes and are not drawn to scale or perspective. InFIG. 4A , frac plug 400 is shown as a compact tool exhibiting a relatively low ratio of tool length to tool diameter and includes afrustoconical member 406, which may be similar to or analogous tocone 106 described above with respect toFIGS. 1 and 2 . Althoughfrustoconical member 406 is depicted in the drawings having relatively smooth surfaces, it is noted that in different embodiments, different surface roughness, surface geometries, or surface texture may be used, such as in conjunction with a given design or material choice ofslips 404, for example. Frac plug 400 may operate to plug a wellbore, such as a cased wellbore having a casing diameter of 3.5 inches, 4 inches, 4.5 inches, or 5.5 inches, among other casing diameters. Frac plug 400 may be set in place by compressing frac plug 400, such that slips 404 are engaged to firmly hold frac plug 400 in a particular location in a corresponding wellbore, such as within a casing of the wellbore. Frac plug 400 may be compressed for setting in place by forcingslips 404 againstfrustoconical member 406 in a direction given byarrow 420. The frictional force ofslips 404 pressing against the interior surface of the wellbore (or the casing) holds frac plug 400 in place in the set or “plugged” condition. Accordingly, the force that maintains frac plug 400 in the set or plugged condition is achieved by virtue of the material strength ofslips 404, as well as the friction betweenslips 404 andfrustoconical member 406. Also visible inFIGS. 4A and 4B areexternal buttons 410, which are enabled to engage the casing when frac plug 400 is set. - In
FIG. 4A , a sectional line on frac plug 400-1 indicates a sectional view 400-2 shown inFIG. 4B . InFIG. 4B showing the sectional view 400-2, internal (or inner)buttons 422 andexternal buttons 410 are visible. Specifically,internal buttons 422 are shown embedded withinslip 404 and protrude fromslip 404. Also visible inFIG. 4B is a slight non-parallel surface ofinternal buttons 422, resulting in an edge to cylindrically shapedinternal buttons 422 that is enabled to engage withfrustoconical member 406 when frac plug 400 is set (not shown), such as by biting into or otherwise deforming at least a portion offrustoconical member 406. - The non-parallel surface of
internal buttons 422 orexternal buttons 410 may be realized using different methods. As shown inFIG. 4B ,internal buttons 422 are regular cylinders that are embedded in a hole that is drilled at a non-perpendicular angle to an inner surface 404-1 of slip 404 (see also inner surface 104-1 inFIG. 1 ). In other embodiments,internal buttons 422 orexternal buttons 410 may be cylindrical parts that are cut obliquely with a non-perpendicular surface at least one end, while the holes drilled inslip 404 are drilled perpendicular to inner surface 404-1. It is noted that in certain implementations,external buttons 422 orinternal buttons 410 may be non-cylindrical in shape, such as having shapes of triangular prisms, square prisms, rectangular prisms, or other polygonal prisms (not shown). - In this manner,
internal buttons 422 may increase the frictional force by which slip 404 is held in place byfrustoconical member 406 when frac plug 400 is set, which may enable the relatively low ratio of tool length to tool diameter, such as by allowing frac plug 400 to have a singlefrustoconical member 406, instead of a plurality of cones and a respective plurality of sets of slips. - The above disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to include all such modifications, enhancements, and other embodiments thereof which fall within the true spirit and scope of the present disclosure.
Claims (35)
1. A slip, comprising:
an outer surface enabled to engage a wellbore surface; and
an inner surface enabled to be engaged by a setting cone of a downhole tool, wherein the inner surface includes at least one inner button enabled to contact the setting cone when the setting cone engages the inner surface.
2. The slip of claim 1 , wherein the outer surface includes at least one outer button enabled to contact the wellbore surface.
3. The slip of claim 1 , wherein the inner button comprises a material that has a higher coefficient of friction than the coefficient of friction of the inner surface of the slip when in contact with the setting cone.
4. The slip of claim 3 , wherein the inner surface of the slip in the downhole tool is parallel to the setting cone.
5. The slip of claim 1 , wherein an exposed surface of the inner button facing the setting cone is not parallel with the setting cone.
6. The slip of claim 1 , wherein the setting cone comprises a metal and the inner button comprises a non-metal.
7. The slip of claim 1 , wherein the inner button comprises a composite material including at least one non-metal.
8. The slip of claim 1 , wherein the inner button comprises a metal.
9. The slip of claim 1 , wherein the inner button is substantially cylindrical in shape.
10. The slip of claim 1 , wherein the inner button is shaped substantially as a polygonal prism.
11. The slip of claim 1 , wherein an exposed surface of the inner button that faces a surface of the setting cone is not parallel with the surface of the setting cone.
12. The slip of claim 1 , wherein an exposed surface of the inner button that faces a surface of the setting cone is parallel with the surface of the setting cone.
13. The slip of claim 1 , wherein the wellbore surface is a casing.
14. A downhole tool, comprising:
a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set; and
wherein the slips further comprise:
an external surface enabled to engage a casing when the downhole tool is set; and
an internal surface enabled to engage the setting cone when the downhole tool is set;
wherein at least one of the slips further comprises:
the internal surface of the slip including at least one internal button enabled to contact the setting cone when the downhole tool is set.
15. The downhole tool of claim 14 , wherein the external surface of the slip includes at least one exterior button enabled to contact the casing.
16. The downhole tool of claim 14 , wherein the internal button comprises a material that has a higher coefficient of friction than the coefficient of friction of the internal surface of the slip when in contact with the setting cone.
17. The downhole tool of claim 14 , wherein the setting cone comprises a metal, and the internal button comprises a non-metal.
18. The downhole tool of claim 14 , wherein the internal button comprises a composite material including at least one non-metal.
19. The downhole tool of claim 14 , wherein the internal button comprises a metal.
20. The downhole tool of claim 14 , wherein the internal surface of the slip is parallel to the setting cone.
21. The downhole tool of claim 14 , wherein an exposed surface of the internal button that faces a surface of the setting cone is not parallel with the surface of the setting cone.
22. The downhole tool of claim 14 , wherein an exposed surface of the internal button that faces a surface of the setting cone is parallel with the surface of the setting cone.
23. The downhole tool of claim 14 , wherein the internal button is substantially cylindrical in shape.
24. The downhole tool of claim 14 , wherein the internal button is shaped substantially as a polygonal prism.
25. A method for engaging downhole tools in wellbores, the method comprising:
running a downhole tool to a depth in a casing, wherein the downhole tool comprises a setting cone enabled to engage a plurality of slips located circumferentially about the setting cone when the downhole tool is set;
setting the downhole tool in the casing, including causing the plurality of slips to engage a setting cone, the slips further comprising:
an outer surface enabled to engage the casing when the downhole tool is set; and
an inner surface enabled to engage the setting cone when the downhole tool is set;
wherein at least one of the slips is an inner button slip further comprising:
the inner surface of the slip including at least one inner button; and
wherein causing the plurality of slips to engage the setting cone further comprises:
forcing the plurality of slips against the setting cone; and
wherein the plurality of slips include the at least one inner button slip, and wherein the inner button contacts the setting cone as the plurality of slips engage the casing.
26. The method of claim 25 , wherein the plurality of slips engaging the setting cone further comprises:
at least one outer button located at the outer surface of the slip engaging the casing.
27. The method of claim 25 , wherein the inner button comprises a material that has a higher coefficient of friction than the coefficient of friction of the inner surface of the slip when in contact with the setting cone.
28. The method of claim 25 , wherein the setting cone comprises a metal, and the inner button comprises a non-metal.
29. The method of claim 25 , wherein the inner button comprises a composite material including at least one non-metal.
30. The method of claim 25 , wherein the inner button comprises a metal.
31. The method of claim 25 , wherein the inner surface of the slip is parallel to the setting cone in the downhole tool.
32. The method of claim 25 , wherein an exposed surface of the inner button that faces a surface of the setting cone is not parallel with the surface of the setting cone.
33. The method of claim 25 , wherein an exposed surface of the inner button that faces a surface of the setting cone is parallel with the surface of the setting cone.
34. The method of claim 25 , wherein the inner button is substantially cylindrical in shape.
35. The method of claim 25 , wherein the inner button is shaped substantially as a polygonal prism.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/442,282 US20200392807A1 (en) | 2019-06-14 | 2019-06-14 | Slips with internal buttons |
CA3083602A CA3083602A1 (en) | 2019-06-14 | 2020-06-15 | Slips with internal buttons |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/442,282 US20200392807A1 (en) | 2019-06-14 | 2019-06-14 | Slips with internal buttons |
Publications (1)
Publication Number | Publication Date |
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US20200392807A1 true US20200392807A1 (en) | 2020-12-17 |
Family
ID=73744763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/442,282 Abandoned US20200392807A1 (en) | 2019-06-14 | 2019-06-14 | Slips with internal buttons |
Country Status (2)
Country | Link |
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US (1) | US20200392807A1 (en) |
CA (1) | CA3083602A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11365600B2 (en) * | 2019-06-14 | 2022-06-21 | Nine Downhole Technologies, Llc | Compact downhole tool |
US20230258051A1 (en) * | 2022-02-14 | 2023-08-17 | Innovex Downhole Solutions, Inc. | Hybrid composite and dissolvable downhole tool |
-
2019
- 2019-06-14 US US16/442,282 patent/US20200392807A1/en not_active Abandoned
-
2020
- 2020-06-15 CA CA3083602A patent/CA3083602A1/en not_active Abandoned
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11365600B2 (en) * | 2019-06-14 | 2022-06-21 | Nine Downhole Technologies, Llc | Compact downhole tool |
US20220356778A1 (en) * | 2019-06-14 | 2022-11-10 | Nine Downhole Technologies, Llc | Compact downhole tool |
US11697975B2 (en) * | 2019-06-14 | 2023-07-11 | Nine Downhole Technologies, Llc | Compact downhole tool |
US20230258051A1 (en) * | 2022-02-14 | 2023-08-17 | Innovex Downhole Solutions, Inc. | Hybrid composite and dissolvable downhole tool |
Also Published As
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CA3083602A1 (en) | 2020-12-14 |
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