WO2020154061A1 - Charges creuses asymétriques et procédé de réalisation de perforations asymétriques - Google Patents

Charges creuses asymétriques et procédé de réalisation de perforations asymétriques Download PDF

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Publication number
WO2020154061A1
WO2020154061A1 PCT/US2019/067937 US2019067937W WO2020154061A1 WO 2020154061 A1 WO2020154061 A1 WO 2020154061A1 US 2019067937 W US2019067937 W US 2019067937W WO 2020154061 A1 WO2020154061 A1 WO 2020154061A1
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WO
WIPO (PCT)
Prior art keywords
liner
insert
shaped charge
case
gun
Prior art date
Application number
PCT/US2019/067937
Other languages
English (en)
Inventor
David Wesson
Phil Snider
Nathan Clark
Wenbo Yang
John Hardesty
Original Assignee
Geodynamics, Inc.
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 Geodynamics, Inc. filed Critical Geodynamics, Inc.
Priority to CA3127434A priority Critical patent/CA3127434A1/fr
Priority to US17/424,668 priority patent/US20220081999A1/en
Priority to EP19911996.7A priority patent/EP3914806A4/fr
Publication of WO2020154061A1 publication Critical patent/WO2020154061A1/fr

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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/116—Gun or shaped-charge perforators
    • E21B43/117—Shaped-charge perforators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/024—Shaped or hollow charges provided with embedded bodies of inert material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/028—Shaped or hollow charges characterised by the form of the liner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/032—Shaped or hollow charges characterised by the material of the liner

Definitions

  • Embodiments of the subject matter disclosed herein generally relate to shaped charges and associated perforations made in the casing of a well, and more specifically, to methods and systems for generating an asymmetric jet of material for perforating the casing to obtain a desired perforation profile.
  • This process of connecting the wellbore to the subterranean formation may include a step of plugging a previously fractured stage of the well with a plug 1 12, a step of perforating a portion of the casing 102, corresponding to a new stage, with a perforating gun string 1 14 such that various channels 1 16 are formed to connect the subterranean formation 106 to the inside of the casing 102, a step of removing the perforating gun assembly, and a step of fracturing the various channels 1 16 of the new stage. These steps are repeated until all the stages are fractured.
  • perforating guns 1 15i of the perforating gun string 1 14 are used to create perforation clusters in the horizontal multistage hydraulically fractured unconventional well 100.
  • Clusters are typically spaced along the length of a stage 140 (a portion of the casing that is separated with plugs from the other portions of the casing), and each cluster comprises multiple perforations (or holes) 130.
  • Each cluster is intended to function as a point of contact between the wellbore 104 and the formation 106.
  • a slurry of proppant (sand) and liquid (water) is pumped into the stage at high rates and then, through the perforation holes 130, into the formation 106, with the intent of hydraulically fracturing the formation to increase the contact area between that stage and the formation.
  • a typical design goal is for each of the clusters to take a proportional share of the slurry volume, and to generate effective fractures, or contact points, with the formation, so that the well produces a consistent amount of oil cluster to cluster and stage to stage.
  • the distribution of the slurry and proppant between the various clusters is not uniform. There can be more slurry deposited near the toe end 140A of the stage 140, resulting in a toe biased stage, or more deposited near the heel end 140B of the stage 140, resulting in a heel biased stage. Sometimes, the clusters may not take appreciable amounts of slurry at all. Size, shape, distribution, and uniformity of perforation holes may contribute to this treatment nonuniformity.
  • the perforation geometry is typically a round hole 130, as shown in Figure 2, punched at a 90 degree angle to the well axis X.
  • holes that are taking fluid and sand may erode to new shapes 132, as the sand wears against the perforation hole while turning from moving down the well and into the perforation hole. This process is exaggerated if only a few of the holes in the stage are taking the slurry, and the eroded holes continually take more fluid, thus propagating the effect even further as the eroding hole 132 becomes much larger than all of the other holes 130 in the stage.
  • Constant Entry Hole or Equal Entry Hole (CEH or EEH) charges have proven to be very beneficial in this application.
  • Baseline conventional shaped charges 150 (Figure 3 shows two shaped charges of the gun 1 15i, one 150 oriented downward and one 152 upward) tend to create a much larger hole 151 in the short water gap G1 when the gun 1 15i rests on the low-side 102A of the casing 102 and a much smaller hole 153 in the high-side 102B of the casing 102 through the longer water gap G2. This means that the water gap negatively affects the size of the holes made in the casing by the shaped charges.
  • the larger holes 151 take more fluid than the smaller holes 153, and they erode over time, resulting in the large holes taking eventually all of the fluid.
  • CEH charges promote more uniform distribution of fluid, and allow the overall reduction of the nominal hole size, which further enables high-density perforation techniques.
  • Shaped charges which create slots have also been used to create noncircular perforation tunnels. These charges have been used in arrangements where the slot was perpendicular to the well axis (as shown in Figure 2 for slot 132) for the purpose of plug and abandonment (channel finding), and at an angle to the axis for fracturing in vertical wells (Saber jet technology).
  • the slots have been generated through nonuniformity in the casing, or as a modular linear charge that has been shortened for use in perforating guns. Slot based charges have the disadvantage that the resultant jet is spread over a broad area, resulting in extreme sensitivity to the water gap in the pressurized well.
  • slot creating perforators therefore would create a large variation in the hole size in the horizontal wells, which would be disadvantageous for this application. Further, slot perforators have not been developed in systems where the slots are oriented in line with the well axis so as to provide beneficial proppant and fluid transport from the well to the formation during hydraulic fracturing operations.
  • a shaped charge for making an asymmetrical perforation into a casing.
  • the shaped charge includes a case extending along a symmetry axis X and having a back wall and an open end; an explosive material located within the case; a liner located within the case, over the explosive material; a booster material; and an asymmetrical feature.
  • asymmetrical feature is selected to generate an asymmetrical perforation into the casing.
  • a liner for covering an explosive material in a case of a shaped charge.
  • the liner includes a metallic powdered material, a binder that holds together the metallic powdered material, and an insert located partially within the metallic powdered material.
  • the liner has a concave shape.
  • a shaped charge for making an asymmetric perforation in a casing of a well.
  • the shaped charge includes a case extending along a symmetry axis X and having a back wall and an open end, an explosive material located at the back wall of the case, a liner located within the case, over the explosive material, and a booster material located in a channel formed in the back wall of the case.
  • the liner includes a metallic powdered material; a binder that holds together the metallic powdered material; and an insert located partially within the metallic powdered material.
  • the liner has a concave shape.
  • a gun for perforating asymmetrically a casing of a well.
  • the gun includes a gun carrier; and a shaped charge located inside the gun carrier and having a liner placed over an explosive material, where the liner includes a metallic powdered material; a binder that holds together the metallic powdered material; and an insert located partially within the metallic powdered material.
  • the liner has a concave shape.
  • the method includes providing a case that extends along a symmetry axis X and has a back wall and an open end; making a channel through the back wall; installing a booster material into the channel; adding an explosive material to the back wall of the case; forming a liner; and placing the liner within the case, over the explosive material.
  • the shaped charge has an asymmetrical feature selected to make the asymmetric perforation into the casing.
  • a gun for perforating a casing in a well includes a gun carrier and an asymmetric shaped charge located inside the gun carrier.
  • the shaped charge has an asymmetrical feature selected to make an asymmetric perforation into the casing.
  • a casing that was perforated with an asymmetrical shaped charge.
  • the casing includes a round wall; and an elongated perforation formed in the round wall with the shaped charge.
  • a longitudinal axis x2 of the elongated perforation extends along a desired direction as a result of using the asymmetrical shaped charge.
  • a method for making an asymmetrical perforation in a casing includes lowering a gun into the casing of a well; firing an asymmetric shaped charge located inside a gun carrier of the gun; and forming the asymmetrical perforation in the casing due to the asymmetric shaped charge.
  • Figure 1 illustrates a well and associated equipment for well completion operations
  • Figure 2 illustrates various holes formed in a casing due to shaped charges
  • Figure 3 illustrates how the size of the holes made in the casing is influenced by the water gap between the casing and the gun;
  • Figure 4 illustrates an asymmetrical shaped charge having a tilted liner
  • Figure 5 illustrates an asymmetrical shaped charge having an asymmetrical channel and booster material
  • Figure 6 illustrates an asymmetrical shaped charge having two asymmetrical channels
  • Figure 7 illustrates an asymmetrical shaped charge having an explosive material with a varying characteristic
  • Figure 8 illustrates an asymmetrical shaped charge having an insert
  • Figure 9 illustrates an asymmetrical shaped charge having an insert with a window
  • Figure 10 illustrates an asymmetrical shaped charge having an insert attached to a liner
  • Figure 1 1 is a top view of the asymmetrical shaped charge having the insert attached to the liner;
  • Figure 12 illustrates the distribution of the initiation points
  • Figure 13 illustrates an asymmetrical shaped charge having an asymmetrical case
  • Figure 14 is a flowchart of a method for making an asymmetrical shaped charge
  • Figure 15 illustrates a liner having an insert completely embedded into the liner
  • Figure 16 illustrates a liner having an insert asymmetrically embedded into the liner
  • Figure 17 illustrates a liner having an insert flush with a surface of the liner
  • Figure 18 illustrates a liner having an insert and a certain profile
  • Figures 19A to 19D illustrate various perforations that may be made in a casing with one or more of the shaped charges discussed herein;
  • Figure 20 is a flowchart of a method for making a liner as illustrated in one of the Figures 15-18;
  • Figure 21 illustrates a gun that has one or more of the shaped charges discussed herein.
  • a shaped charge includes a case, an explosive material, a liner, and a booster material.
  • the explosive material is sandwiched between the case and the liner and the booster material is in contact with the explosive material, at one edge of the explosive material.
  • At least one of these elements of the shape charge is made to be asymmetrical regarding a longitudinal axis (symmetry axis) of the shaped charge.
  • symmetry axis a longitudinal axis
  • the insert may have a symmetrical shape, but asymmetrical properties, i.e. , different physical properties as, for example, a melting point, impedance, etc.
  • the insert is made of an inert material, i.e., a material that does not explode, ignite, or burns under natural conditions.
  • a shaped charge 400 is illustrated in Figure 4 as having a case 402.
  • Case 402 may be made of any material that is strong enough to resist when the explosive material explodes.
  • the case may be made of steel or a metal.
  • the case may take any shape, for example, conical, cylindrical, spherical, hemispherical, bell-shaped, parabolic or hyperboloid.
  • Figure 4 shows the case 402 having a cup shape, with a solid back wall 404 having a channel 406 in which the booster material 430 is located.
  • the back wall 404 is also called herein a closed end.
  • the channel 406 may extend through the pedestal 405, along the symmetry axis X.
  • the back wall 404 continues with a side wall 408 that is shaped as a cup.
  • a top 409 of the case 402 is open. For this reason, this part of the case is called an open end.
  • An explosive material 410 is placed inside the cup shaped case 402.
  • the explosive material 410 is typically packed inside the case 402 by micro-forging or other methods.
  • the explosive material may be a high explosive material, like NONA, ONT, RDX, HMX, HNS, BRX, PETN, CL-20, HNIW, PYX, TATB, TNAZ, HNIW, or other known explosive.
  • the liner 420 covers the explosive material 410 and keeps it inside the case 402.
  • the liner 420 may be made of a reactive or an inert material, e.g., metal particles mixed with a light glue, so that the liner appears like a metallic sheet.
  • the booster material 430 is placed at the bottom of the case 402, in the channel 406.
  • the booster material 430 is connected to a detonation cord 440, which initiates the detonation of the booster material 430.
  • the booster material includes a detonation material, which may be the same as the explosive material 410 or different.
  • the gun detonator is first detonated, which initiates the detonation cord 440.
  • the detonation cord 440 initiates the booster material 430.
  • the detonation of the booster material 430 starts the explosion of the explosive material 410.
  • there is a single initiation point at the interface between the booster material 430 and the explosive material 410.
  • the explosive material 410 is then initiated, which generates a detonation wave.
  • the detonation wave collapses the liner 420 and melts it at the same time, resulting in a jet of material, which is expelled from the case 402 through the open end 409 with a high energy. If the arrangement of the elements shown in Figure 4 is symmetrical relative to the longitudinal axis X (the terms“longitudinal axis X” and “symmetry axis X” are used herein interchangeably), then the jet has substantially a circular cross-section and would generate substantially a circular hole in the casing of the well.
  • the liner 420 is not made to be symmetrical to the longitudinal axis X.
  • the case 402 extends along the longitudinal axis X up to a height having the coordinate x1 .
  • One side 420A of the liner 420 extends to a height having the coordinate x2 (which may be the same or smaller than x1 ) and the opposite side 420B of the liner 420 extends to a height having the coordinate x3, which is different from coordinate x2. This means that the liner 420 is tilted relative to the case 402 and the symmetry axis.
  • the tilted novel liner 420 can make any non-zero angle Q with the reference position.
  • the liner has its own symmetry axis X’ and the entire liner is tilted so that the symmetry axis X makes the non-zero angle Q with the symmetry axis X.
  • only a portion of the liner is tilted while the remaining part of the liner is not tilted, so that the liner itself has no symmetry axis.
  • the non-symmetry of the liner would also make the explosive material 410 to be not symmetric relative to the longitudinal axis X.
  • the explosive material 410, the liner 420, and the case 402 are all symmetrical relative to the longitudinal axis X.
  • the booster material 430 is not symmetrical.
  • Figure 5 shows that the channel 506 is formed to extend along a longitudinal axis X”, which makes a non-zero angle a with the symmetry axis X.
  • the longitudinal axis X and the axis X” would have been coincident if axis X” would have been shown there.
  • the channel in Figure 5 has a longitudinal axis X”, which makes a non-zero angle with the symmetry axis X. This means that the booster material fires along an axis that is not the symmetry axis X.
  • the booster material fires toward a side wall 408 of the case 402.
  • the booster material 430 constitutes the initiation point for the explosive material. Due to the asymmetry of the booster material, the propagation of the detonation front becomes also asymmetrical inside the explosive material 410 while inside the case 402, which results in the expelled jet being non-symmetrical. As will be discussed later, by controlling the asymmetry of the shaped charge, the expelled jet is expected to form a key hole shape in the casing or a slot with a desired orientation relative to a longitudinal axis of the casing of the well.
  • the channel 606 is physically offset from the symmetry axis X, with a given distance d.
  • the channel 606 is asymmetrically positioned relative to the symmetry axis X and/or the case 402, so that the generated jet is expected to form a key hole or slot shape into the casing of the well.
  • the channel 606 axis X may make a non-zero angle with the symmetry axis X, similar to the embodiment shown in Figure 5, except that the channel 606 is also offset from the symmetry axis X.
  • one or more additional channels 606’ may be formed in the base wall 404, also offset from the symmetry axis X.
  • the additional channel 606’ extends along its own longitudinal axis X”, which may be parallel to axis X” of channel 606, or they may make a non-zero angle.
  • the two channels 606 and 606’ are located asymmetrically relative to the symmetry axis X, as shown in Figure 6.
  • one of the channels 606 and 606’ is oriented to have the longitudinal axis parallel to the symmetry axis X while the other channel makes a non-zero angle with the symmetry axis X. Any other variation of these arrangements that achieves a non-symmetrical jet may be used, for example, combining one or both of the embodiments illustrated in Figures 4 and 5 with this embodiment.
  • the explosive material 410 is made to have at least two different volumes 712 and 714 that differ from each other in one characteristic.
  • the volumes may have any shape, may be the same or different, as long as an asymmetry in the generated jet is achieved.
  • the characteristic may be the chemical composition, density, electrical impedance, strength, thermodynamic stability, etc. This embodiment may be combined with one or more of the previously discussed embodiments to further control the asymmetry of the generated jet.
  • an insert 800 is added to the shaped charge to achieve the desired asymmetry.
  • the insert 800 may have any shape, may be made of ferrous, inert or composite materials, may have any thickness and may be positioned anywhere inside the explosive material 410 as long as it generates an asymmetry in the detonation wave, to obtain a controlled asymmetrical jet.
  • the insert 800 is shown in Figure 8 as being placed in one half of the case 402, it is possible to place the insert to extend in both halves of the case. Also, the thickness of the insert does not have to be constant as illustrated in the figure.
  • the insert 800 is not placed to separate the explosive material 410 from the booster material 430.
  • the insert is attached to the case 402, either as insert 810 to the wall 408, or as insert 820 to the back wall 404.
  • an insert 830 may be placed inside the channel 406.
  • one or more of the inserts 800, 810, 820, and 830 may be located inside the case 402.
  • One or more of the inserts 800, 810, 820, and 830 may have a window 802 cut into it, as illustrated in Figure 9, which shows a top view of the shaped charge 400. Th inserts discussed herein may be combined in any way.
  • the insert may be attached to the liner 420 as illustrated in Figure 10 (see element 1000).
  • the insert 1000 may be made of metal, ceramic, polymer or other materials. Similar to the embodiments of Figures 8 and 9, the insert 1000 may have any shape, thickness or may have a window.
  • the insert 1000 may directly deposited on the liner with a 3D printer. In one application, the insert 1000 is achieved by painting the back of the liner 420 with a thick bead substance, for example, glyptol, glue, epoxy, or other polymers. In still another application, the insert 1000 may be a pocket of air or air trapped within a printed or foamed material.
  • the insert 1000 similar to the insert 800, may be attached to only a sector of the liner 420, or all around the liner as illustrated in Figure 1 1 , which shows a top view of the liner.
  • Figures 10 and 1 1 shows the formation of the insert 1000 on the back of the liner, i.e., between the liner and the explosive material 410, it is also possible to form the insert on top of the liner, on the opposite side of the explosive material. Note that the various asymmetric features discussed in the previous embodiments may be combined in any way.
  • inserts 1200 and 1210 may be distributed inside the case 402 so that an angle b between the two inserts is in the range of 165 to 195°, as illustrated in Figure 12.
  • a variable initiation profile in the initiation section (i.e., booster material) of the shaped charge is obtained, which is responsible for the generation of an asymmetric detonation wave front, which ultimately results in the asymmetric jet.
  • This asymmetric jet then creates the key hole and/or slots in the casing of the well.
  • the inserts discussed above can be made, not only of metallic, polymer or plastic materials, but also from ceramic, e.g., silica sand.
  • the case 402 it is possible to make the case 402 to be asymmetrical.
  • the wall 408 is made to have a part 408A having a first shape and another part 408B having a different shape.
  • the shape is directly associated with the volume of explosive material 410 held by the respective part.
  • Figure 13 shows the part 408A of the wall being shaped to hold less explosive material 410 than the wall part 408B.
  • channel 406 still extends along the former symmetry axis X, which is not a symmetry axis for this embodiment.
  • the liner 420 has a smaller part 422 that corresponds to the smaller volume of explosive material hold by the part 408A of the lateral wall 408 and a larger part 424 corresponding to the part 408B.
  • each of the case 402, the liner 420, and the explosive material 410 are asymmetrical relative to the symmetry axis X. In one modification of this
  • a case 402 is provided.
  • the case 402 may have a symmetry axis X, which is also a longitudinal axis. However, the case may also be asymmetric.
  • the channel 406 is made into the back wall 404 of the case 402.
  • the channel 406 may be made along the symmetry axis X, inclined relative to this axis, or offset from the symmetry axis.
  • the channel 406 is made offset from the symmetry axis X, it may also be made to extend along an axis X” that is parallel to the symmetry axis X, or axis X” makes a non-zero angle with the symmetry axis X. In one embodiment, more than one channel 406 is formed into the back wall 404 of the case 402, so that all these channels are asymmetrically distributed relative to the symmetry axis X.
  • the booster material 430 is placed into the channel 406 by any known method. If more than one channel 406 is formed, the channels may be distributed as illustrated in Figure 12, to achieve a desired angle between the initiation points.
  • the explosive material 410 is added to the interior of the case 402. The explosive material can be added by any known means. The explosive material 410 may be made to be uniform or not. If the explosive material is not uniform, at least one characteristic of the explosive material may vary inside the case, as discussed above with reference to Figure 7. In one application, another material may be inserted at specific locations inside the case to vary the
  • the another material may be the insert 800 or 1000 discussed above, or even air or another inert material.
  • the explosive material 410 may be made to be symmetrical or not relative to the symmetry axis X.
  • the symmetry refers to the volumetric distribution of the explosive material, or to at least another characteristic (as discussed above) of the explosive material.
  • the liner 420 is formed.
  • the liner may be formed by injection mold, 3D print, machined, cast, extrusion, stamping, mold, microforge, etc.
  • the liner 420 may be made to be symmetric relative to the symmetry axis X or not.
  • one side of the liner is made larger than the other side of the liner, as illustrated in Figure 13.
  • the liner is shaped as a trumpet for directing the explosive energy to a desired location.
  • an insert 1000 may be attached to the liner as illustrated in Figure 10.
  • an insert 800 may be added to the explosive material 410 or the case 402 as illustrated in Figure 8.
  • the insert may be added to the channel 406, to make the entire shaped charge asymmetrical, as shown in Figure 8.
  • Step 1410 may be performed at any time during the method, depending where the insert is placed.
  • the liner is attached to the case so that the shaped charge is ready to be used.
  • Figure 15 shows a liner 420 disposed symmetrically around the symmetry axis X.
  • an insert 1500 is located completely within the liner 420, i.e. , no face or edge of the insert 1500 is facing the explosive material 410 or the ambient above the shaped charge 400.
  • the insert 1500 may be made of the same materials as the inserts 800 and 1000, and it may be manufactured by forging, molding, or printing.
  • the insert 1500 may be symmetric relative to the symmetry axis X, extends along the liner 420, but not over the entire liner so that a central portion 426 of the liner 420 has the insert and a peripheral portion 428 of the liner is free of the insert.
  • both the liner 420 and the insert 1500 are symmetrical relative to the symmetry axis X, but the asymmetry of the shaped charge is achieved because the insert does not extend over the entire liner.
  • the liner 1500 may have a generally concave shape.
  • the concave shape may be symmetrical or not relative to the symmetry axis X.
  • the concave shape may be implemented in many ways, for example, as a trumpet, cone, bell, hemispherical, etc.
  • the liner 420 includes at least one type of powdered metal 1502.
  • the metal may be copper, tin, nickel, tungsten, lead, molybdenum or a combination of these materials.
  • the metallic powder is held together with a binder 1504.
  • the binder can be a glue, polymer or other material.
  • the liner is machined from a solid piece of material.
  • the liner is printed, forged, or molded.
  • an insert 1600 is located only in one portion of the liner and not in an opposite portion.
  • the asymmetry of the shaped charge is achieved in this embodiment because of the location of the insert within the liner.
  • the asymmetry shown in either Figure 15 or Figure 16 may be combined with any of the previously discussed asymmetries of the shaped charge.
  • Figure 17 is similar to that of Figure 16, except that a face 1700A of the insert 1700 is fully exposed either to the ambient or to the explosive material 410, i.e., a face of the insert is flush with a front or back face of the liner 420.
  • FIG. 18 shows the liner 420 having the insert 1800 distributed according to any of the embodiments of Figures 15-17, but an angle g between the symmetry axis X and an arm of the liner is between 20 and 40°, or between 100 and 120°.
  • FIG. 19A shows a part of a casing 1902 that extends along a longitudinal axis X2, which coincides with the longitudinal axis X1 of the well.
  • a slot 1910 is formed in the casing with one of the above shaped charge configurations. The slot 1910 extends along the longitudinal axis X1 due to the orientation of the asymmetry of the shaped charge.
  • the slot 1910 is defined as having a middle portion 1912 that has the largest size along an axis Y1 perpendicular to the longitudinal axis X1 , and two end portions 1914 and 1916 that narrow when moving away from the middle portion 1912.
  • Figure 19B shows a key hole perforation 1920 formed in the casing
  • the key hole perforation 1920 is defined as having a head portion 1922 that is substantially circular, and a tail portion 1924, that has a decreasing size.
  • the key hole perforation 1920 was made so that it extends along the X2 axis, with its head portion closer to a heel of the casing (when the casing is used in a horizontal well) so that the pumping of the slurry does not erodes substantially this portion.
  • the shaped charge is selected to have the longitudinal axis X2 of the key hole aligned with the longitudinal axis X1 of the casing.
  • the gun is moved so that a second shaped charge is aligned with the head portion of the first key hole.
  • the second shaped charge is rotated relative to the first shaped charge, i.e., the initiation point(s) of the first shaped charge are angularly offset from the initiation point(s) of the second shaped charge, the second shaped charge forms the second key hole 1930- 2.
  • the process continues until all four shaped charges are fired and the
  • Figure 19D shows a configuration in which a slot 1940 and two key holes 1950-1 and 1950-2 are formed to have a common area 1942. Similar to the embodiment of Figure 19C, more or less shaped charges may be used to obtain different perforation configurations.
  • asymmetric shaped charges may be attached to the gun carrier to be perpendicular to the longitudinal axis of the casing, it is also possible to have the shaped charges installed with a non-zero angle relative to the axial direction of the casing. In one embodiment, it is possible that some asymmetrical shaped charges are
  • key hole perforations are very sensitive to the water gap and pressure, and will produce suboptimal results in downhole conditions.
  • the key hole perforation produced with the asymmetrical shaped charge discussed above has a consistent hole size, with the key hole extending the opportunity for sand placement.
  • Another possible advantage is that the traditionally eroded holes tend to be shaped like a key hole, so that by directly producing a key hole perforation, it is likely to be less eroded by the sand placement.
  • the perforations will be a tapered slot, generated by a slot producing charge being held at an angle within the gun body (generally tilted toe-ward, but could be either way) so that the travel distances for the various parts of the jet are not symmetric, which will result in a narrowing slot.
  • step 2000 the material for an insert 1500, 1600, 1700 or 1800 is selected.
  • step 2002 the insert is made into the desired shape. Any known method that is used for making the liner may be used to form the insert.
  • step 2004, the insert is positioned at one of the positions shown in Figures 15-18, inside the material of the liner, and in step 2006 the material of the liner is pressed (other methods may be used) to create the liner. Note that at least a first face of the insert is fully embedded within the liner as illustrated in any of the embodiments of Figures 15-18.
  • At least a second face of the insert is partially, if not totally embedded within the liner. In some embodiments, more than two faces (even all the faces) of the insert are fully embedded into the liner. In still another embodiment, only one face is not fully embedded into the liner.
  • FIG. 21 A gun having one or more of the shaped charged discussed with regard to Figures 4-20 is illustrated in Figure 21.
  • Gun 2100 includes a gun carrier 21 10 that houses one or more shaped charges 400.
  • the gun carrier may be shaped as a cylinder and may be sealed from the casing of the well.
  • a first shaped charge 400 has its symmetry axis X making a non-zero angle with a radial axis Y, which is perpendicular on the longitudinal axis L of the gun carrier.
  • a second shaped charge 400 is shown having its symmetry axis X making a zero angle with the radial axis Y. Any number of shaped charges 400 may be positioned within the gun carrier.
  • traditional shaped charges 150 discussed with regard to Figure 3 are mixed up with the asymmetrical shaped charges 400.
  • the disclosed embodiments provide methods and systems for generating a slot or key hole perforation into a casing of a well, by using at least a shaped charge that has an asymmetrical feature. It should be understood that this description is not intended to limit the invention. On the contrary, the exemplary embodiments are intended to cover alternatives, modifications and equivalents, which are included in the spirit and scope of the invention as defined by the appended claims. Further, in the detailed description of the exemplary

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

L'invention concerne une charge creuse (400) pour réaliser une perforation asymétrique dans un boîtier. La charge creuse (400) comprend un boîtier (402) s'étendant le long d'un axe de symétrie X et ayant une paroi arrière (404) et une extrémité ouverte (409) ; une substance explosive (410) située à l'intérieur du boîtier (402) ; un revêtement (420) situé à l'intérieur du boîtier (402), sur la substance explosive (410) ; un matériau de relais pyrotechnique (430) ; et une caractéristique asymétrique. La caractéristique asymétrique est sélectionnée pour générer une perforation asymétrique dans le boîtier.
PCT/US2019/067937 2019-01-23 2019-12-20 Charges creuses asymétriques et procédé de réalisation de perforations asymétriques WO2020154061A1 (fr)

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CA3127434A CA3127434A1 (fr) 2019-01-23 2019-12-20 Charges creuses asymetriques et procede de realisation de perforations asymetriques
US17/424,668 US20220081999A1 (en) 2019-01-23 2019-12-20 Asymmetric shaped charges and method for making asymmetric perforations
EP19911996.7A EP3914806A4 (fr) 2019-01-23 2019-12-20 Charges creuses asymétriques et procédé de réalisation de perforations asymétriques

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US201962795685P 2019-01-23 2019-01-23
US62/795,685 2019-01-23

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US11499401B2 (en) 2021-02-04 2022-11-15 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load
US11661823B2 (en) 2013-07-18 2023-05-30 DynaEnergetics Europe GmbH Perforating gun assembly and wellbore tool string with tandem seal adapter
US11753909B2 (en) 2018-04-06 2023-09-12 DynaEnergetics Europe GmbH Perforating gun system and method of use
US11795791B2 (en) 2021-02-04 2023-10-24 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load

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Publication number Priority date Publication date Assignee Title
US11661823B2 (en) 2013-07-18 2023-05-30 DynaEnergetics Europe GmbH Perforating gun assembly and wellbore tool string with tandem seal adapter
US11753909B2 (en) 2018-04-06 2023-09-12 DynaEnergetics Europe GmbH Perforating gun system and method of use
US11499401B2 (en) 2021-02-04 2022-11-15 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load
US11795791B2 (en) 2021-02-04 2023-10-24 DynaEnergetics Europe GmbH Perforating gun assembly with performance optimized shaped charge load

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CA3127434A1 (fr) 2020-07-30
EP3914806A4 (fr) 2022-09-21
EP3914806A1 (fr) 2021-12-01
US20220081999A1 (en) 2022-03-17

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