Abstract: A technique facilitates patching of a tubing (42), e.g. casing (36), in a downhole environment (32). The technique employs a patching system comprising a plurality of expansion rings (48). The expansion rings (48) are moved downhole to a patch zone (38) along the tubing (34). Once in a desired position at the patch zone, the expansion rings (48) are expanded into engagement with an inner surface of the tubing. For example, the expansion rings may comprise seal elements (52) and/or anchor elements which are expanded into engagement with the inside surface. The patching system further comprises a patch (68) which may have a tubular shape. The patch is radially expanded in a manner which maintains a sealing engagement with the plurality of expansion rings (48) to create a sealed patch across a desired region in the patch zone.

Abstract: A technique facilitates use of a packer (34) in a borehole (32) or within other tubular structures. The packer (34) may be constructed for mounting about a generally tubular base pipe (36). The packer (34) generally comprises a metal sleeve (40) combined with extremities (44) located at each axial end of the metal sleeve. The metal sleeve maintains a seal once expanded to a surrounding wellbore wall, e.g. a casing wall. For example, the metal sleeve may be combined with an elastomer along its exterior so the elastomer may seal against the surrounding wellbore wall (42) when the metal sleeve is radially expanded. Additionally, an anchoring system (48) is disposed within one or both of the extremities and oriented for engagement with the tubular base pipe so as to act against rotation and sliding of the packer with respect to the tubular base pipe (42).

Abstract: An extrudable ball seat (36) is configured to be secured along a well tubing (34). The extrudable ball seat (36) comprises a larger diameter section (42) and a smaller diameter (44) section connected by a conical section (46). The conical section (46) has an internal seating surface (48) for receiving a corresponding element, e.g. a ball (52), in sealing engagement. The extrudable ball seat (36) facilitates controlled extrusion of the element following a pressure actuation procedure by providing the smaller diameter section (44) with sufficient ductility to enable extrusion of the element under an increased predetermined pressure. Additionally, the extrudable ball seat comprises at least one notch (56), e.g. a plurality of grooves (58), positioned to initiate crack propagation and thus extrusion of larger elements.

Abstract: A technique facilitates utilization of a packer (34) in a borehole (32) or within other tubular structures. The packer may be constructed for mounting about a generally tubular base pipe (36). The packer generally comprises a metal sleeve (40) combined with extremities (44) located at each axial end of the metal sleeve. The metal sleeve (40) maintains a seal once expanded to a surrounding wellbore wall, e.g. a casing wall. For example, the metal sleeve (40) may be combined with an elastomer along its exterior, the elastomer sealing against the surrounding wellbore wall when the metal sleeve is radially expanded. Additionally, a device, e.g. a valve (62), is employed to control the pressures acting on the metal sleeve. For example, the device may be in the form of a valve operable (62) to control pressures acting on the metal sleeve (40) while miming-in-hole, during expansion of the metal sleeve, and after setting of the packer.

Abstract: A technique facilitates setting of a liner hanger in a casing or within other tubular structures via a setting tool. The liner hanger may be constructed with an expandable hanger body between fixed ends. The expandable hanger body is formed from a material, e.g. metal, sufficiently ductile to undergo plastic deformation as it is expanded into engagement with a surrounding casing or other tubing. The expandable hanger body is expanded via fluid delivered under high pressure by the setting tool. The setting tool has a pressure booster to achieve the desired high pressure. The pressure booster may be in the form of a multi-diameter piston constructed to establish the desired high pressure during a single stroke.

Abstract: A technique facilitates pressure application downhole by locking a ball in place to prevent it from unseating even if the pressure is bled off. A ball seat is constructed with a locking feature for effectively capturing and retaining the ball once the ball is seated in the ball seat under sufficient pressure. According to an embodiment, the ball seat may be mounted at a desired position along an internal flow passage of a well string component. The ball seat comprises a throat section which is formed of a ductile material arranged in a suitable structure to enable a desired deformation upon receiving the ball under sufficient pressure. As the ball is pressed into the throat section, the material of the throat section deforms and partially springs back to resist movement of the ball in the uphole direction, thus capturing the ball in both the uphole direction and the downhole direction.

Abstract: A technique facilitates setting of a liner hanger in a casing or within other tubular structures via a setting tool. The liner hanger may be constructed with an expandable hanger body between fixed ends. The expandable hanger body is formed from a material, e.g. metal, sufficiently ductile to undergo plastic deformation as it is expanded into engagement with a surrounding casing or other tubing. The expandable hanger body is expanded via fluid delivered under high pressure by the setting tool. The setting tool has a pressure booster to achieve the desired high pressure. The pressure booster may be in the form of a multi-diameter piston constructed to establish the desired high pressure during a single stroke.

Abstract: A technique facilitates use of a packer (34) in a borehole (32) or within other tubular structures. The packer (34) may be constructed for mounting about a generally tubular base pipe (36). The packer (34) generally comprises a metal sleeve (40) combined with extremities (44) located at each axial end of the metal sleeve. The metal sleeve maintains a seal once expanded to a surrounding wellbore wall, e.g. a casing wall. For example, the metal sleeve may be combined with an elastomer along its exterior so the elastomer may seal against the surrounding wellbore wall (42) when the metal sleeve is radially expanded. Additionally, an anchoring system (48) is disposed within one or both of the extremities and oriented for engagement with the tubular base pipe so as to act against rotation and sliding of the packer with respect to the tubular base pipe (42).

Abstract: A technique facilitates utilization of a packer (34) in a borehole (32) or within other tubular structures. The packer may be constructed for mounting about a generally tubular base pipe (36). The packer generally comprises a metal sleeve (40) combined with extremities (44) located at each axial end of the metal sleeve. The metal sleeve (40) maintains a seal once expanded to a surrounding wellbore wall, e.g. a casing wall. For example, the metal sleeve (40) may be combined with an elastomer along its exterior, the elastomer sealing against the surrounding wellbore wall when the metal sleeve is radially expanded. Additionally, a device, e.g. a valve (62), is employed to control the pressures acting on the metal sleeve. For example, the device may be in the form of a valve operable (62) to control pressures acting on the metal sleeve (40) while miming-in-hole, during expansion of the metal sleeve, and after setting of the packer.

Abstract: An extrudable ball seat (36) is configured to be secured along a well tubing (34). The extrudable ball seat (36) comprises a larger diameter section (42) and a smaller diameter (44) section connected by a conical section (46). The conical section (46) has an internal seating surface (48) for receiving a corresponding element, e.g. a ball (52), in sealing engagement. The extrudable ball seat (36) facilitates controlled extrusion of the element following a pressure actuation procedure by providing the smaller diameter section (44) with sufficient ductility to enable extrusion of the element under an increased predetermined pressure. Additionally, the extrudable ball seat comprises at least one notch (56), e.g. a plurality of grooves (58), positioned to initiate crack propagation and thus extrusion of larger elements.

Abstract: A technique facilitates patching of a tubing (42), e.g. casing (36), in a downhole environment (32). The technique employs a patching system comprising a plurality of expansion rings (48). The expansion rings (48) are moved downhole to a patch zone (38) along the tubing (34). Once in a desired position at the patch zone, the expansion rings (48) are expanded into engagement with an inner surface of the tubing. For example, the expansion rings may comprise seal elements (52) and/or anchor elements which are expanded into engagement with the inside surface. The patching system further comprises a patch (68) which may have a tubular shape. The patch is radially expanded in a manner which maintains a sealing engagement with the plurality of expansion rings (48) to create a sealed patch across a desired region in the patch zone.

Abstract: A technique facilitates use of a packer in a borehole or within other tubular structures. The packer may be constructed with a tubing, a metal sealing element mounted around the tubing, and a differential pressure valve system. The metal sealing element may be expanded under fluid pressure for sealing engagement with a surrounding wall surface. Additionally, the differential pressure valve system is placed in fluid communication with the interior of the metal sealing element and comprises a plurality of valves which operate automatically to increase pressure within the metal sealing element when certain pressure differentials occur. The differential pressure valve system enables the packer to hold against higher differential pressures and also may be constructed so the packer is less sensitive to thermal variations.

Abstract: The invention relates to a fluid control device (500) for treating a well, said device comprising: a piston (550) translatably mounted in said chamber (320) and releasable immobilization means (900) capable of rupturing, on which, in an initial state, one end (552) of the piston (550) comes into abutment and which, in an initial position, close the pipe associated with the annular space (350), the immobilization means (900) being releasable under the influence of the fluid pressure in the chamber (320) which is equal to the fluid pressure in the liner (100), a closure member (514) translatably mounted in said chamber (320), configured to open or close the communication pipe (316) with the inside of the casing (200), said closure member being, in the initial state, in contact with another end (554) of the piston (550) which holds it in the open position.

Abstract: The invention relates to a fluid control device (500) for treating a well, to expand a liner (100) radially outward, said device comprising a piston (550) translatably mounted in said chamber (320), and degradable immobilization means (590), secured in translation with the piston (550), wherein the degradable immobilization means (590) are movable in translation in a cavity (700), wherein the device comprises protection means (800) isolating the cavity (700) from a discharge pipe (810) configured to introduce fluid degrading the pin (590) in said cavity (700), such that, in the initial state, the protection means (800) protect said degradable immobilization means (590), the protection means (800) being configured to break when the pressure in the cavity reaches a threshold pressure gap (?Ps) allowing degradation of the degradable immobilization means (900).

Abstract: A technique facilitates use of a packer in a borehole or within other tubular structures. The packer may be constructed with a tubing, a metal sealing element mounted around the tubing, and a differential pressure valve system. The metal sealing element may be expanded under fluid pressure for sealing engagement with a surrounding wall surface. Additionally, the differential pressure valve system is placed in fluid communication with the interior of the metal sealing element and comprises a plurality of valves which operate automatically to increase pressure within the metal sealing element when certain pressure differentials occur. The differential pressure valve system enables the packer to hold against higher differential pressures and also may be constructed so the packer is less sensitive to thermal variations.

Abstract: A method for hydraulic stimulation of rock of a borehole of a well having an internal casing. The method includes positioning a conduit in the casing, the conduit having along its external face expandable tubular sleeves, fixedly linked to the conduit, and at least one aperture before each sleeve placing the internal space of the conduit into communication with the space demarcated by the conduit and each sleeve. A fluid is injected into the conduit under a first pre-determined pressure, which is sufficient to expand the sleeves. For each of the areas of the wall of the well to be stimulated, the method includes: plugging the conduit downstream from a first area to be stimulated; perforating the wall of the conduit and, at least in certain cases, perforating the casing at the first area to be stimulated; and injecting a fluid into the conduit under a second stimulation pressure.

Abstract: A device is provided for cementing a casing in a well bore. The device includes, on the well head side, a shutter disposed within the casing that controls opening and closing of at least one cementing aperture. The at least one cementing aperture makes an interior of the casing communicate with an annular space situated between an external face of the casing and an internal wall of the well. The device also includes, on the well bottom side, a packer having two expandable liners mounted along the external face of the casing and at least one communication passage between an exterior of the first external liner and the annular volume. The at least one communication passage is situated on the packer side orientated towards the well bottom.

Abstract: A radially expandable tubular metallic element includes on its external face at least a series of annular sealing lips made of elastically deformable material. These lips are spaced in pairs. The transversal cross section of each lip has an end face and two lateral walls, wherein the lips are made of a non-metallic material and are inclined in the same direction, relative to said external face, that is, each of the lateral walls of each lip forms a non-zero angle (?; ?) relative to a radial plane of said element.

Abstract: An isolation of part of a well, which includes a pipe provided, along its external face, with a first external sleeve, wherein the opposite ends are connected directly or indirectly to said external face of the pipe. The pipe, first external sleeve and its ends together delimit an annular space, the wall of said pipe exhibiting at least one opening which allows it to communicate with said space, this sleeve being likely to expand and to be applied tightly against the well over an intermediate part of its length. The device also includes on the one hand, a second internal sleeve, which extends between said pipe and the first sleeve, its ends being also connected directly or indirectly to the external face of said pipe and, on the other hand, at least one communication passage between the exterior of the first sleeve and said space.

Abstract: The invention concerns a radially expandable metal tubular element having on its outer surface a series of spaced apart annular sealing modules. This element is noteworthy in that each sealing module comprises two annular metal abutments between which there are inserted an annular seal and two anti-extrusion rings, the seal being positioned between the two anti-extrusion rings and the two metal abutments being secured against the outer surface of the said tubular element, in that the two anti-extrusion rings are made in elastically and plastically deformable material and are in one or two parts, and in that the two anti-extrusion rings and/or the seal comprise at least two opposite facing bevelled surfaces capable of sliding relative to one another under the effect of axial movement of the said seal so as to cause outward radial displacement of one of the anti-extrusion rings or at least one of the two parts thereof.