WO2005008016A2 - Garniture d'etancheite gonflable amelioree - Google Patents

Garniture d'etancheite gonflable amelioree Download PDF

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Publication number
WO2005008016A2
WO2005008016A2 PCT/US2004/020533 US2004020533W WO2005008016A2 WO 2005008016 A2 WO2005008016 A2 WO 2005008016A2 US 2004020533 W US2004020533 W US 2004020533W WO 2005008016 A2 WO2005008016 A2 WO 2005008016A2
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WO
WIPO (PCT)
Prior art keywords
mandrel
annular space
inflatable
packer
pressurized fluid
Prior art date
Application number
PCT/US2004/020533
Other languages
English (en)
Other versions
WO2005008016A3 (fr
Inventor
Scott R. Clingman
Mark C. Gentry
Steven B. Lonnes
William A. Sorem
Original Assignee
Exxonmobil Upstream Research Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exxonmobil Upstream Research Company filed Critical Exxonmobil Upstream Research Company
Priority to US10/558,452 priority Critical patent/US20070012437A1/en
Publication of WO2005008016A2 publication Critical patent/WO2005008016A2/fr
Publication of WO2005008016A3 publication Critical patent/WO2005008016A3/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B33/127—Packers; Plugs with inflatable sleeve
    • E21B33/1277—Packers; Plugs with inflatable sleeve characterised by the construction or fixation of the sleeve

Definitions

  • This invention relates generally to an improved inflatable packer useful for restricting flow of fluids in a wellbore during the perforating and treating of a subterranean formation to increase the production of oil and gas therefrom. More particularly, this invention relates to an inflatable packer having a tubular mandrel with an outer diameter essentially equal to the deflated inner diameter of an inflatable element surrounding the mandrel and further having fluid flow passages that direct the flow of fluid for inflating the element into and through the annular space between the mandrel and the element. Preferably, the fluid flow passages direct the flow of fluid for inflating the element in a direction substantially parallel to the longitudinal axis of the mandrel.
  • a wellbore penetrating a subterranean formation typically includes a metal casing cemented into the original drill hole. Perforations are made to penetrate through the casing and the cement sheath surrounding the casing to allow hydrocarbon flow into the wellbore and, if necessary, to allow treatment fluids to flow from the wellbore into the formation.
  • Hydraulic fracturing comprises injecting fluids (usually viscous shear thinning, non-Newtonian gels or emulsions) into a formation at pressures and rates high enough to cause the reservoir rock to fail and to form a planar, typically vertical, fracture (or fracture network) much like the fracture that extends through a wooden log as a wedge is driven into it.
  • Granular proppant materials such as sand, ceramic beads, or other materials, are generally injected with the later portion of the fracturing fluid to hold the fracture(s) open after the fluid pressure is released.
  • Increased flow capacity from the reservoir results from the flow path left between grains of the proppant material within the fracture(s).
  • flow capacity is improved by dissolving materials in the formation or otherwise changing formation properties.
  • the major disadvantages are the high cost of treatment resulting from multiple trips into and out of the wellbore and the risk of complications resulting from so many operations in the well. For example, a bridge plug can become stuck in the casing and need to be drilled out at great expense.
  • a further disadvantage is that the required wellbore clean-out operation may damage some of the successfully fractured intervals.
  • a standard inflatable packer assembly 10 comprises several separate parts, including an inflatable element 14, a tubular mandrel 12, two end-caps 13, and two ends 16 and 18. Often, end 16 is fixed and end 18 is sliding, i.e., adapted to slide along mandrel 12 as element 14 is inflated and/or deflated, as will be familiar to those skilled in the art.
  • the packer assembly is typically attached to tubing 17.
  • inflatable elements metal-slat reinforced, metal-cable reinforced, and polymer composite reinforced.
  • An inflatable packer can be assembled using any type of inflatable element, including the three described above, by inserting a mandrel through the center of the element and using two end-caps to attach the element to the mandrel.
  • the elements that have the most desirable properties in terms of absolute pressure resistance and internal differential-pressure resistance comprise an outer elastomeric cover (which, when inflated and sealingly engaged with the wall or casing of the wellbore, provides pressure seals above and below the packer), a reinforcement structure (which provides adequate mechanical strength to withstand stresses induced by inflation), and an internal elastomeric bladder (which provides a pressure seal between the fluids inside and outside the element).
  • an outer elastomeric cover which, when inflated and sealingly engaged with the wall or casing of the wellbore, provides pressure seals above and below the packer
  • a reinforcement structure which provides adequate mechanical strength to withstand stresses induced by inflation
  • an internal elastomeric bladder which provides a pressure seal between the fluids inside and outside the element.
  • each type of reinforced element has different strengths and weaknesses, each type is generally best suited for particular types of applications.
  • Commercially available polymer-reinforced packers are most often used in low temperature and/or low pressure water well applications and can typically survive many inflation/deflation cycles under lower pressure conditions.
  • Metal-cable reinforced packers have also been optimized to maximize fatigue life (and hence the number of inflation/deflation cycles), and while testing has shown that currently available varieties may not handle as many cycles as the polymer-reinforced variety, they are currently able to handle relatively high temperatures.
  • metal-slat reinforced elements have been optimized for high-pressure, high-temperature service at the cost of shorter fatigue life.
  • placing the element in a different position within a string of tools to reduce compressive loading may be detrimental in several ways, including shifting the higher compressive loads to other tools, exposing other downhole tools to flows/environments otherwise protected by the packer, making the tool-string more complex, or changing the functionality of the tool- string itself.
  • One technique utilizes a plurality of holes drilled through the entire covered length of the mandrel thereby affording multiple fluid pathways between an energized fluid source within the mandrel and the inflation chamber.
  • the inflation fluid pathway include the interior of the mandrel (which may be required to contain electric lines or serve as a passageway for a separate fluid system).
  • the holes can result in internal-bladder failure initiation sites due to either external pressure extrusion through the holes or jet-impingement onto the bladder during inflation.
  • a second technique which does not use the interior of the mandrel in the inflation fluid pathway, requires a second, concentric, perforated tube between the element and a solid mandrel (see US 5,495,892).
  • the inflation pathway is then shifted to between the mandrel and the concentric tube, effectively preventing the element from pinching off the inflation/deflation fluid pathway.
  • this design is not applicable in situations where the mandrel is placed under larger compressive stresses, as the additional tube can not be load bearing when used in floating head packers (i.e., inflatable packers that use one fixed end and one floating end , i.e., an end that is allowed to travel during inflation (the predominant packer design in the oil-field)).
  • Inner-bladder failures are the most common failure mechanism in composite packers. This is not surprising as these bladders tend to be constructed of thin elastomeric tubes (necessary to allow expansion during inflation) and they are typically the only pressure seal around the inflatable chamber. Two of the most common inner-bladder failure mechanisms are pinching failures and extrusion failures.
  • Pinching failures initiate during deflation when the thin elastomeric bladder, having just been stretched during the inflation stage, is now quickly forced into its initial deflated dimensions without giving the elastomer enough time to relax.
  • the still distended bladder can fold over itself given enough radial clearance. If a large external or internal pressure is applied to the packer element while a fold is present, the pressure can act to squeeze the fold together and split the bladder along the fold line. Once the bladder splits, the element no longer possesses pressure integrity and the packer has failed. A smaller clearance between the mandrel and the element would alleviate this problem, but can result in other problems as stated above.
  • Extrusion failures occur when applied pressure forces the thin elastomeric bladder through a gap or hole in either the surrounding reinforcement structure or the mandrel/mandrel-end-cap junction.
  • element design has focused on minimizing the gap-sizes in the element reinforcing structures wrapped around the inner bladder. How effective the design is in minimizing the reinforcement gap size, coupled with the strength of the reinforcement, generally determines the maximum internal pressure differential that the element will be able to resist without failure.
  • the same degree of care has not been extended to preventing extrusion failures caused by large applied external pressures. This is in part due to the relatively low frequency of events with large applied external pressures.
  • the inner- bladders are especially susceptible to external pressure extrusion failures when the element is in a deflated, non-sealing state because the inner- bladder is in direct contact with any holes or gaps in the mandrel assembly.
  • Inflatable packers are rarely used in conjunction with proppant fracturing operations due to their propensity to become damaged or stuck downhole when exposed to particulate-laden environments.
  • Current designs generally rely on single o-ring seals to provide both static and dynamic pressure seals at the mandrel/end-cap junction to isolate the pressurized, inflatable chamber from the wellbore. Through testing, we have found that, under both particulate-free and particulate-laden environments, more robust pressure seals would be advantageous.
  • An inflatable packer comprises: (a) a tubular mandrel having a longitudinal axis; (b) an inflatable element substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space; and (c) one or more fluid flow passages extending through the annular space between the element and the mandrel, which fluid flow passages are adapted to cause at least a portion of said pressurized fluid to be introduced into said annular space in a direction substantially parallel to said longitudinal axis of said tubular mandrel.
  • each of said fluid flow passages is in fluid communication with each of the other said fluid flow passages.
  • the mandrel has an outer diameter that is substantially equal to the inner diameter of the element prior to inflation.
  • at least one of the fluid flow passages is formed by two or more grooves in the mandrel.
  • the element comprises an outer elastomeric cover and a plurality of interconnected inner slats and, further, at least a portion of said elastomeric cover has been removed such that at least a portion of the interconnected inner slats are exposed.
  • an inflatable packer suitable for use under a pre-selected compressive load comprising: (a) a tubular mandrel having a longitudinal axis, and (b) an inflatable element substantially concentrically disposed around said mandrel and adapted to provide pressure seals above and below said inflatable packer when inflated, and further said mandrel has an outer diameter suitably large to prevent bending and buckling of the mandrel under said pre-selected compressive load that results in failure of either of said pressure seals or of said inflatable packer.
  • an inflatable packer suitable for use under a pre-selected external pressure comprising: (a) a tubular mandrel having a longitudinal axis; (b) an inflatable element comprising an inner bladder and an outer elastomeric cover and being substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space; (c) one or more fluid flow passages extending through the annular space between the element and the mandrel, which fluid flow passages are adapted to cause at least a portion of said pressurized fluid to be introduced into said annular space in a direction substantially parallel to said longitudinal axis of said tubular mandrel, and further where
  • an inflatable packer comprises: (a) a tubular mandrel having a longitudinal axis, and (b) an inflatable element comprising an inner bladder and an outer elastomeric cover and being substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space, and further wherein said mandrel has an outer diameter suitably large to prevent folding of said inner bladder within said annular space between said element and said mandrel.
  • an inflatable packer comprises: (a) a tubular mandrel having a longitudinal axis, and (b) an inflatable element comprising an outer elastomeric cover and a plurality of interconnected inner slats and being substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space, and further wherein at least a portion of said elastomeric cover has been removed such that an appropriate length of said interconnected inner slats are exposed to minimize the deflated diameter of said element and to prevent loss of said outer elastomeric cover when said packer undergoes a plurality of inflation/deflation cycles.
  • a plurality is meant to include two or more inflation/deflation cycles. In another embodiment, a plurality is meant to include three or more inflation/deflation cycles. In yet another embodiment, a plurality is meant to include five or more inflation/deflation cycles.
  • an inflatable packer suitable for use under a pre-selected internal pressure comprising: (a) a tubular mandrel having a longitudinal axis, and (b) an inflatable element comprising an outer elastomeric cover, an inner bladder, and a plurality of interconnected inner slats and being substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space, and further, wherein a portion of said elastomeric cover has been removed such that an appropriate length of said interconnected inner slats are exposed to prevent said exposed slats from damaging said inner bladder when said packer is subjected to said pre-selected
  • an inflatable packer suitable for use under a pre-selected external pressure comprising: (a) a tubular mandrel having a longitudinal axis; (b) an inflatable element comprising an inner bladder and an outer elastomeric cover and being substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space; and (c) one or more fluid flow passages extending through the annular space between the element and the mandrel, which fluid flow passages are adapted to cause at least a portion of said pressurized fluid to be introduced into said annular space in a direction substantially parallel to said longitudinal axis of said tubular mandrel, and wherein
  • an inflatable packer suitable for use under a pre-selected external pressure comprising: (a) a tubular mandrel having a longitudinal axis; (b) an inflatable element comprising an inner bladder and an outer elastomeric cover and being substantially concentrically disposed around said mandrel, said element having a first end and a second end with each said end being sealingly attached to the mandrel, and said element being adapted (i) to be inflated by introduction of pressurized fluid into an annular space between said element and the mandrel and (ii) to be deflated by removal of said pressurized fluid from said annular space; (c) one or more fluid flow passages extending through the annular space between the element and the mandrel, which fluid flow passages are adapted to cause at least a portion of said pressurized fluid to be introduced into said annular space in a direction substantially parallel to said longitudinal axis of
  • Said device that is adapted to prevent extrusion of said inner bladder when said packer is subjected to said preselected external pressure may comprise a filter, a screen, or any other device capable of preventing such extrusion, as will be familiar to those skilled in the art.
  • FIG. 1 is a sketch of a standard inflatable packer assembly
  • FIG. 2A is a cut-away view of an inflatable packer according to this invention.
  • FIG. 2B is a plan view at section 24 of the inflatable packer illustrated in FIG. 2A (looking down at the top);
  • FIG. 2C is a plan view at section 34 of the inflatable packer illustrated in FIG. 2A (looking down at the top);
  • FIG. 2D is a detailed sketch of groove 33 shown in FIG. 2C;
  • FIG. 3 is a sketch of an element useful in the present invention.
  • FIG. 4 is a graphical representation of data showing the benefits of use in the present invention of the element illustrated in FIG. 3;
  • This invention comprises several improvements to an inflatable packer assembly to address performance limitations in existing packer designs. These improvements allow the assembly to operate more reliably when (1 ) large compressive loads are applied to the packer, (2) large external pressures are applied to the packer, and/or (3) the packer is placed in a particulate-laden environment.
  • the compressive load capability is optimized by maximizing the outer tubular diameter of the mandrel with respect to the inner diameter of the element.
  • the threads at both ends are oriented so as to compress at one quarter of the buckling load thereby allowing the shoulders above and below the threads to shoulder with the adjacent female sub. This feature substantially ensures that the entire load-bearing cross-sectional area is in contact when the tool is subjected to large compressive load.
  • the tubular mandrel is constructed to be effectively flush with the inner diameter of the element, i.e., the outer diameter of the mandrel is substantially equal to the inner diameter of the element.
  • the tubular mandrel has one or more passages therethrough for the passage of fluid, electrical wires, or other devices though the interior thereof.
  • Fluid flow passages e.g., comprising a plurality of metal runners to form slots or "flutes", are provided down the sides of the mandrel and/or on the inner-bladder of the element to allow fluid flow along the length of the element while retaining the large outer diameter required for high resistance to buckling and bending loads.
  • fluid flow passages includes any passage formed in any way in the annulus between the mandrel and the inner-bladder, such as flutes in the mandrel or inserted tubes, but is not intended to refer to an annular region between the mandrel and the inner bladder. Passages may comprise holes, perforations, grooves, slots, or other continuous openings. To reduce the likelihood of damage to the inner- bladder, the fluid entrance to the flutes are preferably oriented parallel to the longitudinal axis of the mandrel to avoid any fluid-jet impingement on the inner-bladder.
  • Fluid flow through the flutes and annulus is preferably substantially parallel to the longitudinal axis of the mandrel; however, some or all of the fluid flow may be oriented to flow in a helical path around the outer surface of the mandrel, or in some other path.
  • the flutes are designed to accommodate external pressure loading without damaging the thin inner-bladder. This is accomplished, for example without limiting this invention, through the use of chamfered and beveled edges, a slow run-out at the end of the flutes, and/or the installation of a suitable filter or screen at the entrance to, throughout and/or covering the flutes.
  • a suitable filter or screen may comprise, for example, a shaped load-bearing, porous material, sintered metal filters, machined screens, and other suitable filters or screens as will be familiar to those skilled in the art.
  • the combination of these features minimizes the chance to cut the inner-bladder in the event external pressure forces the bladder into the mandrel and mandrel/end-cap junctions.
  • the new, larger mandrel design improves packer performance in other ways; 1 ) the smaller resultant clearance between the mandrel and the element minimizes the opportunity for occurrence of inner-bladder pinching failures, 2) the design of the mandrel's outer diameter profile mitigates element inner-bladder extrusion failures caused by the application of external-pressure, and 3) the proportionately larger inner diameter allows for both significant fluid flow for rapid pressure equalization across the packer and the passage of secondary conduits for additional communication (pressure, flow, electrical) with the wellbore and remaining bottomhole assembly below the packer.
  • a mandrel 20 has an upper end 25 having threads 26, for connection to tubing or an end-cap, and sealant ring glands 42 and 44 to assist in sealing. Neither tubing or an end-cap is shown in any of FIG. 2A - FIG.
  • mandrel 20 in section 24 has an outer edge 20c and an outer diameter 22 of about 5.05 cm. (1.99 inches).
  • mandrel 20 at section 24 has outer edge 20c and a plurality of flutes or grooves 23 having outer edge 20a, each having a width 21 of about 0.64 cm. (0.25 inches) and a depth 27 of about 0.25 cm. (0.1 inch) and being substantially evenly spaced at an angle 29 of about 45 degrees along the circumference of mandrel 20.
  • mandrel 20 has a lower end 35 having threads 36, for connection to an end-cap, and sealant ring glands 52 and 54 to assist in sealing, as will be familiar to those skilled in the art.
  • the end-cap is not shown in any of FIG. 2A - 2D and may be any end-cap that is suitable for the application at hand, although same may require modification to fit mandrel lower end 35, as will be familiar to those skilled in the art.
  • mandrel 20 in section 34 has outer edge 20b and an outer diameter 32 of about 4.92 cm. (1.937 inches). Referring to FIG.
  • mandrel 20 at section 34 has outer edge 20b and a plurality of flutes or grooves 33 having outer edge 20a, each having a width 31 of about 0.64 cm. (0.25 inches) and a depth 37 of about 0.188 cm. (0.074 inch) and being substantially evenly spaced at an angle 39 of about 45 degrees along the circumference of mandrel 20.
  • grooves 33 in section 34 are manufactured with chamfers 40 at an angle of about 45 degrees and are beveled to minimize damage to the inner bladder of the inflatable element circumferentially disposed over mandrel 20 when exposed to external pressure.
  • grooves 23 in section 24 are similarly chamfered and beveled.
  • This embodiment may include screen sleeves that are disposed axially over the length of the fluted region and are supported against radial external loading by the non-fluted portion 20b of mandrel 20 outside diameter.
  • the screen sleeves could be confined axially through a diameter upset on the mandrel at one end and a removable securing device on the other end, for example, a threaded sleeve that screws onto mandrel 20 and axially presses the screen sleeves against the mandrel diameter upset.
  • the screen sleeves would contain numerous radial holes sized to prevent extrusion of the inner bladder when external pressure is applied, the numerous radial holes having diameters of about 0.2 mm (0.008") and numbering in the thousands.
  • the screen sleeve may be made in two or more sections in order to reduce the longitudinal dimension over which tight radial tolerances must be maintained and to facilitate cleaning and inspection.
  • Reference to a screen herein will be understood to include embodiments having such multiple sections.
  • the inflatable element is not shown in any of FIG. 2A - FIG. 2D and may be any inflatable element that is suitable for the application at hand, as will be familiar to those skilled in the art. The specific description of this embodiment of the invention in no way limits this invention. As is familiar to those skilled in the art, dimensions of parts are adjusted as needed for the application at hand.
  • wipers are preferably added to the floating end to remove particulates as the packer is inflated and deflated.
  • redundant o-rings seals with back-up rings to prevent extrusion preferably replace the single o-ring seals commonly used in existing designs.
  • a POLY-PAK, pressure-energized seal is preferably used in the floating end for improved sealing and a more robust seal for use in particulate-laden environments.
  • upper end 25 of tubular mandrel 20 comprises a blunt nose 43 and threads 26, which threads 26 are oriented so as to compress at one quarter of the buckling load thereby allowing the shoulders above and below the threads to shoulder with the female sub above, as will be familiar to those skilled in the art.
  • threads 26 are oriented at an angle 41 of about 30 degrees.
  • the seal system comprises VITON o-rings (not shown in the FIG.) in ring glands 44 with PARBAK backup rings (not shown in the FIG.) in ring glands 42.
  • the tubular or end-cap to which upper end 25 is connected may require modification to ensure a tight fit, as will be familiar to those skilled in the art.
  • Lower end 35 of tubular mandrel 20 comprises a blunt nose 53 and threads 36, which threads 36 are oriented so as to compress at one quarter of the buckling load thereby allowing the shoulders above and below the threads to shoulder with the female sub below, as will be familiar to those skilled in the art.
  • threads 36 are oriented at an angle 51 of about 30 degrees.
  • the seal system comprises VITON o-rings (not shown in the FIG.) in ring glands 54 with PARBAK backup rings (not shown in the FIG.) in ring glands 52.
  • the end-cap to which lower end 35 is connected may require modification to ensure a tight fit, as will be familiar to those skilled in the art.
  • the floating end preferably comprises a TEFLON wiper ring and a poly-pack pressure energized seal, both as will be familiar to those skilled in the art.
  • a metal-slat reinforced element is preferred.
  • one end of a preferred element 60 for use in a packer assembly according to this invention is illustrated as attached to an end-cap 66.
  • the outer elastomer cover 64 Prior to inflation, has a length 62 of exposed slats 63 of about 7.62 cm. (3.0 inches) with a taper 65 of about 15 degrees.
  • element 60 has such exposed slats at both ends.
  • FIG. 4 compares the deflated outer diameter of a packer according to this invention without exposure of 3 inches of the slats at each end to the deflated outer diameter of a packer according to this invention with exposure of 3 inches of slats (as illustrated in FIG. 3) at each end.
  • Each packer was tested within casing having an inner diameter of about 11.86 cm (4.67 inches).
  • the element on each packer had an outer diameter of about 9.53 cm (3.75 inches) and a rubber outer cover with a thickness of about .95 cm (3/8 inch).
  • abscissa 70 indicates axial position of the packers during testing, with the numerals 2, 4, 6, . . .
  • Ordinate 71 indicates the measured outer diameter of the element in inches
  • area 72 shows measurement data from the original element before the first inflation
  • area 73 shows measurement data about the element as modified with the exposed slats after 30 inflation/deflation cycles
  • area 74 shows measurement data about the original element (unmodified) after 20 inflation/deflation cycles.
  • the maximum final outer diameter of the packer with the exposed slats was about 10.62 cm. (4.182 inches) after 30 cycles compared to a maximum final outer diameter of about 11.30 cm. (4.45 inches) after 20 cycles for the packer without exposed slats.

Abstract

L'invention porte sur une garniture d'étanchéité gonflable améliorée. Dans un mode de réalisation, cette garniture d'étanchéité améliorée présente un mandrin tubulaire avec un diamètre externe sensiblement égal au diamètre interne dégonflé d'un élément gonflable entourant le mandrin, et présente des passages d'écoulement de fluides qui sont adaptés pour qu'au moins une partie de fluide pressurisé gonfle l'élément à introduire dans l'espace annulaire entre la garniture d'étanchéité et le mandrin dans un sens sensiblement parallèle à l'axe longitudinal du mandrin tubulaire.
PCT/US2004/020533 2003-07-14 2004-06-24 Garniture d'etancheite gonflable amelioree WO2005008016A2 (fr)

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US10/558,452 US20070012437A1 (en) 2003-07-14 2004-06-24 Inflatable packer

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US48718503P 2003-07-14 2003-07-14
US60/487,185 2003-07-14

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