EP2456950A2 - Sous-ensemble de puits de forage avec un canon perforateur - Google Patents

Sous-ensemble de puits de forage avec un canon perforateur

Info

Publication number
EP2456950A2
EP2456950A2 EP10802015A EP10802015A EP2456950A2 EP 2456950 A2 EP2456950 A2 EP 2456950A2 EP 10802015 A EP10802015 A EP 10802015A EP 10802015 A EP10802015 A EP 10802015A EP 2456950 A2 EP2456950 A2 EP 2456950A2
Authority
EP
European Patent Office
Prior art keywords
perforating
charge
wellbore
wall
tubular body
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.)
Withdrawn
Application number
EP10802015A
Other languages
German (de)
English (en)
Other versions
EP2456950A4 (fr
Inventor
Nathan Brian Coffey
Terry Lee Mytopher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nine Energy Canada Inc
Original Assignee
Integrated Production Services Ltd
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 Integrated Production Services Ltd filed Critical Integrated Production Services Ltd
Publication of EP2456950A2 publication Critical patent/EP2456950A2/fr
Publication of EP2456950A4 publication Critical patent/EP2456950A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • E21B43/116Gun or shaped-charge perforators
    • E21B43/117Shaped-charge perforators
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • E21B43/116Gun or shaped-charge perforators
    • E21B43/1185Ignition systems
    • E21B43/11852Ignition systems hydraulically actuated

Definitions

  • the present invention relates to the field of wellbore subassemblies with perforating guns.
  • a wellbore generally refers to a hole drilled into the earth for the extraction of hydrocarbon-based materials such as, for example, oil and natural gas. Because the term “wellbore” generally includes the openhole or uncased portion of a well, the term “wellbore” typically refers to the space bounded by the wellbore wall—that is, the face of the geological formation that bounds the drilled hole. A wellbore is sometimes referred to as a "borehole.”
  • a perforation is the communication tunnel created from the casing or liner into the reservoir formation, through which oil or gas is produced.
  • the most common method of perforating uses jet perforating guns equipped with shaped explosive charges.
  • other perforating methods include bullet perforating, abrasive jetting or high- pressure fluid jetting.
  • Perforation density is the number of perforations per linear foot. The term perforation density is used to describe the configuration of perforating guns or the placement of perforations, and is often abbreviated to spf (shots per foot). An example would be an 8 spf perforating gun.
  • Perforation penetration is a measure, or indicator, of the length that a useable perforation tunnel extends beyond the casing or liner into the reservoir formation. In most cases, a high penetration is desirable to enable access to that part of the formation that has not been damaged by the drilling or completion processes.
  • Perforation phasing is the radial distribution of successive perforating charges around the gun axis. Perforating gun assemblies are commonly available in 0-, 180-, 120-, 90- and 60-degree phasing. The 0-degree phasing is generally used only in small outside-diameter guns, while 60, 90 and 120 degree phase guns are generally larger but provide more efficient flow characteristics near the wellbore.
  • a perforating gun is a device used to perforate oil and gas wells in preparation for well production. Such guns typically contain several shaped explosive charges and are available in a range of sizes and configurations. The diameter of the gun used is typically determined by the presence of wellbore restrictions or limitations imposed by the surface equipment.
  • the perforating gun, fitted with shaped charges or bullets, is lowered to the desired depth in a well and fired to create penetrating holes in casing, cement, and formation.
  • to perforate is to pierce the casing wall and cement of a wellbore to provide holes through which formation fluids may enter or to provide holes in the casing so that materials may be introduced into the annulus between the casing and the wall of the borehole.
  • Figure 1 sets forth a drawing illustrating a top orthogonal view of a wellbore subassembly with perforating gun according to embodiments of the present invention.
  • Figure 2 sets forth a drawing illustrating an elevation view of the wellbore subassembly with perforating gun according to embodiments of the present invention.
  • Figure 3 sets forth a drawing illustrating a left orthogonal view of the wellbore subassembly with perforating gun according to embodiments of the present invention.
  • Figure 4 sets forth a drawing illustrating the A-A sectional view of the wellbore subassembly with perforating gun according to embodiments of the present invention from Figure 3.
  • Figure 5 sets forth a drawing illustrating a detailed view of region one of the wellbore subassembly with perforating gun according to the embodiments of present invention from Figure 4.
  • Figure 6 sets forth a drawing illustrating a detailed view of region two of the wellbore subassembly with perforating gun according to the embodiments of present invention from Figure 4.
  • Figure 7 sets forth a drawing illustrating a detailed view of region three of the wellbore subassembly with perforating gun according to the embodiments of present invention from Figure 4.
  • Figure 8 sets forth a drawing illustrating B-B sectional view of the wellbore subassembly with perforating gun according to the embodiments of the present invention from Figure 2.
  • Figure 9 sets forth a drawing illustrating a detailed view of region four of the B-B sectional view in Figure 8.
  • Figure 10 sets forth a drawing illustrating the C-C sectional view of the wellbore subassembly with perforating gun according to the embodiments of the present invention of Figure 2.
  • Figure 11 sets forth a drawing illustrating the D-D sectional view of the wellbore subassembly with perforating gun according to the embodiments of the present invention of Figure 2.
  • Figure 12 sets forth a drawing illustrating an exploded view of the wellbore subassembly with perforating gun according to the embodiments of the present invention of Figure 2.
  • Figure 13 sets forth a drawing illustrating a wellbore subassembly with perforating gun according to the embodiments of the present invention in which the firing assembly is secured within the firing assembly recess using clamps.
  • Figure 14 sets forth a drawing illustrating a top orthogonal view of the wellbore subassembly with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 15 sets forth a drawing illustrating the elevation view of the wellbore subassembly with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 16 sets forth a drawing illustrating the bottom view of the wellbore subassembly with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 17 sets forth a drawing illustrating the right view of the wellbore subassembly with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 18 sets forth a drawing illustrating the path view the wellbore subassembly with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 19 sets forth a drawing illustrating a top orthogonal view of an additional wellbore subassembly with perforating gun according to embodiments of the present invention.
  • Figure 20 sets forth a drawing illustrating an elevation view of the additional wellbore subassembly with perforating gun according to embodiments of the present invention.
  • Figure 21 sets forth a drawing illustrating the E-E sectional view of the wellbore subassembly with perforating gun according to the embodiments of the present invention of Figure 15.
  • Figure 22 sets forth a drawing illustrating the F-F sectional view of the wellbore subassembly with perforating gun according to the embodiments of the present invention of Figure 15.
  • Figure 23 sets forth a drawing illustrating the G-G sectional view of the wellbore subassembly with perforating gun according to the embodiments of the present invention of Figure 15.
  • Figure 24 sets forth a drawing illustrating several wellbore subassemblies with perforating guns according to the embodiments of the present invention that are conveyed along a casing string of a horizontal well.
  • Figure 1 sets forth a drawing illustrating a top orthogonal view of a wellbore subassembly (100) with perforating gun according to embodiments of the present invention.
  • the wellbore subassembly (100) of Figure 1 is a device that may be convey along a tubular string through a wellbore and used to perforate a geological formation adjacent to the wellbore at the location of the wellbore subassembly (100).
  • the tubular string on which the wellbore subassembly (100) of Figure 1 is conveyed may be a casing string, a liner, a coiled tubing string, or any other tubular structure conveyed through a wellbore as will occur to those of skill in the art.
  • the purpose of perforating the geological formation is to create fractures that assist in increasing the communication conductivity of hydrocarbon-based materials from the geological formation to the wellbore and then in turn to the surface.
  • the wellbore subassembly (100) of Figure 1 includes a tubular body (102) having a tubular wall (104).
  • the tubular wall (104) of the exemplary wellbore subassembly (100) in Figure 1 separates and defines two spaces— an interior space (not shown) along the inside of the tubular body (102) and an exterior space (108) surrounding the outside of the tubular body (102).
  • the tubular body (102) in the example of Figure 1 is configured in a cylindrical shape because many wellbore components utilize this shape, but other shapes as will occur to those of skill in the art may also be useful.
  • the tubular body (102) is primarily designed out of a strong, but lightweight material, such as for example, aircraft aluminum.
  • a strong, but lightweight material such as for example, aircraft aluminum.
  • other materials may also be useful in wellbore subassemblies according to embodiments of the present invention such as, for example, other types of aluminum, steel, carbon-based materials, and so on.
  • the interior space (not shown) of the wellbore subassembly (100) may be used to convey the variety of materials that typically pass through a tubular string during the lifecycle of a well.
  • materials include, for example, water, treatment fluids, frac gels, hydrocarbons, or any other materials as will occur to those of skill in the art.
  • the exterior space (108) of Figure 1 is the region surrounding the wellbore subassembly (100) and may include the adjacent geological formation.
  • the exterior space (108) of Figure 1 may also include any intervening structures between the wall (104) and the geological formation, including any additional tubular walls from strings through which the wellbore subassembly (100) is conveyed, any pockets of air or fluid in the annulus between the wall (104) and the geological formation.
  • the tubular string on which the wellbore subassembly (100) of Figure 1 is conveyed is cemented in place. That is, cement fills the annulus between the wall (104) and the geological formation.
  • the exterior space (108) also includes this cement annulus and the adjacent geological formation.
  • the tubular wall (104) has a cavity (110) for holding perforating charges (112) and a detonation cord (not shown).
  • the detonation cord connects the charges (112) to a firing assembly (not shown, discussed below) that is installed in the firing assembly recess (122).
  • the exemplary tubular body (102) of Figure 1 includes only one cavity (110) and that cavity (110) is configured in an "S" pattern that runs longitudinally along the length of the tubular body (102).
  • This "S" patterned cavity (110) in Figure 1 is shaped to define three rows of charge sockets (114). In the view of Figure 1, however, only one row of the charge sockets is visible— namely, the row of charge sockets (114a-h).
  • Each charge socket (114) of Figure 1 is cylindrical in shape slightly larger than the perforating charge (112) that will be configured inside the socket (114).
  • Each socket (114) of Figure 1 receives and holds only one perforating charge (112), and in this manner, each charge sockets (114) isolates its corresponding perforating charge (112) from the others charges to minimize interference among the charges (112) as the charges (112) detonate.
  • the shape of the sockets (114) themselves also operate to minimize detonation interference among the charges (112) because walls of each socket (114) assist in channeling the explosive forces from each perforating charge (112) radially inward toward the center of the wellbore subassembly (100) rather than permitting the explosive forces to flow laterally along the longitudinal length of the tubular body (102).
  • the perforating charges (112) are typically inserted into the charge sockets (114) and held in place by frictional forces, O-ring gaskets, or other ways as will occur to those skilled in the art.
  • a detonation cord is then run from the firing assembly (discussed below) along the cavity (110) and across the top of the charges (112).
  • the tubular wall (104) also includes a removable outer layer (not shown, discussed below) that fits around the portion of the tubular body (102) containing the perforating charges (112).
  • This removable exterior sleeve covers the cavity (110) from the exterior space (108) and protects the charges (112) from conditions in the exterior space (108).
  • the removable outer layer may also operate to keep the charges and detonation cord in place inside the cavity (110).
  • the wellbore subassembly (100) of Figure 1 includes a plurality of perforating charges (112).
  • Each perforating charge (112) of Figure 1 is configured in the cavity (110) at a location inside, that is within, the wall (104).
  • the perforating charges (112) of Figure 1 are shaped charges that channel the explosive forces in the direction of the center of the tubular body (102). That is, the perforating charges (112) of Figure 1 are configured to discharge toward the interior space (not shown) and penetrate into the exterior space (108) by perforating the wall (104) across the interior space from the location of the perforating charge (112) defined as the target wall.
  • each charge (112) discharges toward and into the interior space and out through the other side via the target wall of the wellbore subassembly (100) into the exterior space (108).
  • This discharge configuration creates a straight path, free from irregularities and well defined, through the tubular wall (104) for communicating fluids, gases, or other materials between the interior space of the wellbore subassembly (100) and the exterior space (108).
  • the wellbore subassembly (100) also includes exit cavities (120) designed to reduce the thickness of the wall (104) where the perforating charges (112) penetrate into the exterior space (108).
  • the exit cavities (120) of Figure 1 effectively thin the amount of the wall (104) that the charges (112) must perforate before penetrating into the exterior space (108) and allow more energy from the detonation to reach the exterior space (108). This results in deeper penetrations into the adjacent geological formation.
  • Each exit cavity (120) in the example of Figure 1 corresponds to and is shaped similar to one of the charge sockets (114).
  • Each exit cavity (120) of Figure 1 is cylindrical in shape and is located in the wall (104) across the interior space from the location of its corresponding charge socket (114) and perforating charge (112).
  • the exit cavities (120a-h) correspond to charges and charge sockets that are not visible from the view of Figure 1 because those charges and charge sockets are on the opposite side of the wellbore subassembly (100).
  • the exit cavities (120i-p) also correspond to charges and charge sockets that are not visible in Figure 1.
  • charges (112a-h) and charge sockets (114a-h) are visible in Figure 1, the corresponding exit cavities are not visible because they are on the opposite side of the wellbore subassembly (100).
  • the firing assembly recess (122) of Figure 1 is implemented as a slot in the wall (104) oriented longitudinally along the tubular body (102).
  • the firing assembly recess (122) of Figure 1 is connected to the cavity (110) through a hollowed passage (not shown) in the wall (104).
  • the firing assembly recess (122) is configured to receive a firing assembly oriented longitudinally along the tubular body (102).
  • the firing assembly is secured in the firing assembly recess (122) of Figure 1 using an exterior sleeve (not shown) that is described further with reference to Figure 10 below.
  • the firing assembly may be secured in the firing assembly recess (122) using clamps such as those clamps described further with reference to Figure 11 below.
  • Figure 2 sets forth a drawing illustrating an elevation view of the wellbore subassembly (100) with perforating gun according to embodiments of the present invention.
  • the view of the wellbore subassembly (100) in Figure 2 illustrates the third row of charge sockets (114q-x) configured in the cavity (110) and also illustrates exit cavities (120i-p).
  • Each charge socket (114q-x) receives a single perforating charge (112) and corresponds with one of the exit cavities (120a-h) depicted in Figure 1.
  • the charge socket (114x) corresponds with exit cavity (120a) from Figure 1 because the perforating charge (112x) in the socket (114x) is directed to penetrate the wall (104) at the location of the exit cavity (120a) in Figure 1 across the interior space of the tubular body (102).
  • Figure 3 sets forth a drawing illustrating a left orthogonal view of the wellbore subassembly (100) with perforating gun according to embodiments of the present invention.
  • Figure 3 depicts the tubular body (102) formed from a cylindrical wall (104).
  • the wall of Figure 3 defines an interior space (106) and an exterior space (108).
  • the tubular body (102) includes a removable outer layer (118) that covers the cavity (not shown) from the exterior space (108).
  • the tubular body (102) of Figure 3 also includes an inner liner (134) configured along the tubular body (102) between the sockets (not shown) of the cavity and the interior space (106).
  • the inner liner (134) of Figure 3 separates the charge sockets from the interior space (106).
  • Figure 4 sets forth a drawing illustrating the A-A sectional view of the wellbore subassembly (100) with perforating gun according to embodiments of the present invention from Figure 3.
  • the wellbore subassembly (100) of Figure 4 includes a tubular body (102) that has a wall (104) defining an interior space (106) and an exterior space (108).
  • the wall (104) of Figure 4 has a cavity (110) that is shaped to define a plurality of charge sockets (114).
  • the cavity (110) connects to the firing head recess (122) via a hollowed passage through the wall (104) of the tubular body (102).
  • Figure 4 illustrates the exit cavities (120) corresponding to the charge sockets (114).
  • the exit cavity (120) can have therein or associated therewith an accelerator or performance enhancer to provide a cleaner perforation tunnel, as well as a longer, bigger and better defined fraction or perforation.
  • the accelerator or performance enhancer can be any appropriate stimulator, such as for example, a jet fuel product. Further, the accelerator or performance enhancer can be in any form, such as for example, a solid, liquid, wax or combinations thereof.
  • Such an accelerator or performance enhancer can be built into the exit cavity (120), can be placed in the exit cavity (120), or associated with the exit cavity (120) so as to provide a cleaner perforation tunnel, as well as a longer, bigger and better defined fraction or perforation.
  • the tubular body (102) includes an inner liner (134).
  • the inner liner (134) is configured longitudinally along the length of the tubular body (102) between the cavity (110) and the interior space (106).
  • the inner liner (134) of Figure 4 is cylindrical in shape and forms part of the wall (104) defining the interior space (106).
  • the sides of the inner liner (134) in Figure 4 are generally flat, thereby making the cross-section of the sides of the inner liner (134) rectangular in shape.
  • the wall of the inner liner (134) may be formed in a variety of geometric configurations to enhance structural support along different areas of the tubular body (102).
  • the cavity (110) may extend at various locations through the wall (104) to the inner liner (134) such as, for example, at the charge sockets (114). In such embodiments, when the perforating charge (112) first penetrates into the interior space (106), it need only pass through the inner liner (134). In other embodiments, however, the cavity (110) may not extend through the wall (104) all the way to the inner liner (134). In those embodiments, the perforating charge (112) must first penetrate through a portion of the wall material forming the cavity (110) as well as the inner liner (134) before reaching the interior space (106).
  • the inner liner (134) of Figure 4 extends along the tubular body (102) at the portion of the tubular body (102) containing the perforating charges (112).
  • the inner liner (134) may extend along the entire length of the tubular body (102) or merely a portion of the tubular body (102).
  • the inner liner (134) of Figure 4 operates to reduce interference among the perforating charges (112) as the charges (112) detonate serially. This interference may occur because, as each charge (112) detonates, the pressure from the detonation may deform nearby charge sockets.
  • any undetonated charges in those nearby sockets may not fire completely along the intended path directly through the interior space (106) and out of the other side of the wellbore subassembly (100).
  • This misdirected detonation reduces the effectiveness of the charge (112) at penetrating into the exterior space (108).
  • the inner liner (134) of Figure 4 reduces the interference among the perforating charges (112) by reinforcing the charge sockets (114).
  • the inner liner (134) of Figure 4 is made of a harder material than the portion of the tubular body (102) forming the cavity (110).
  • the inner liner (134) of Figure 4 may be made of a material such as steel.
  • the other portions of the tubular body (102) may be configured from aluminum or other materials that are relatively lightweight, but become brittle and susceptible to deformation at high pressures such as may occur during a charge detonation.
  • a material such as for example steel, which is not typically subject to the deformation that would diminish the effectiveness of the perforating charges (112)
  • an inner liner may not provide any advantages.
  • the tubular body (102) in the example of Figure 4 includes two interchangeable end adapters— an interchangeable end adapter (126a) on the left end of the tubular body (102) and an interchangeable end adapter (126b) on the right end of the tubular body (102).
  • These interchangeable end adapters allow the wellbore subassembly (100) to be conveyed along tubular strings of varying sizes or that connect with the wellbore subassembly (100) using different types of interfaces such as, for example, different types of screw threads.
  • Each interchangeable end adapter (126) has a first interface (128) for connecting to the other portions of the tubular body (102) and has a second interface (130) for connection to a tubular string along which the wellbore assembly (100) is conveyed.
  • the interchangeable end adapter (126a) on the left side of the tubular body (102) includes the first interface (128a) that is implemented using a screw thread that matches the screw thread of the portion of the tubular body (102) to which the interchangeable end adapter (126a) connects.
  • the second interface (130a) of the interchangeable end adapter (126a) in the example of Figure 4 is also implemented using a screw thread.
  • the screw thread of the second interface (130a) matches the screw thread of the next component in the tubular string along which the wellbore subassembly (100) is conveyed.
  • the interchangeable end adapter (126b) on the right side of the tubular body (102) includes a first interface (128b).
  • the first interface (128b) is implemented using a screw thread that matches the screw thread of the portion of the tubular body (102) to which the interchanged end adapter (126b) connects.
  • the interchangeable end adapter (126b) of Figure 4 also includes a second interface (130b) that is implemented using a screw thread that matches the screw thread of the next component of the tubular string along which the wellbore subassembly (100) is conveyed.
  • Figure 5 sets forth a drawing illustrating a detailed view of region one of the wellbore subassembly (100) with perforating gun according to the embodiments of present invention from Figure 4.
  • the perforating charge (112b) is configured in charge socket (114b) at a location within the wall (104).
  • the wall (104) is configured with an exit cavity (12Or).
  • the perforating charge (112b) in example of Figure 5 is protected from the exterior space (108) by the removable outer layer (118).
  • the wall (104) includes inner liner (134) made of a material, such as for example steel, that reinforces socket (114b) to withstand the forces created from the other detonating charges.
  • the perforating charge of (112b) is a shaped charge that detonates inwardly toward the interior space (106) and perforates the wall (104) at a location across the interior space (106) from the location of the perforating charge (112b) and penetrates into the exterior space (108). That is, in the example of Figure 5, the perforating charge detonates along the direction of arrow (146). Upon detonation, therefore, the perforating charge (112b) penetrates the inner liner (134) at specific regions (148, 150) and then continues through the wall (104) to penetrate the removable outer layer (118) at another region (152).
  • the intermediate region (150) can be defined as the wall target.
  • FIG. 6 sets forth a drawing illustrating a detailed view of region two of the wellbore subassembly (100) with perforating gun according to the embodiments of present invention from Figure 4.
  • the cavity (110) is configured to form charge socket (114h), and the perforating charge (112h) is seated in the socket (114h) of Figure 6.
  • a detonation cord (not shown) is extended across the top of the perforating charge (112h) along the cavity (110) and is configured through the hollowed passageway (136) to the firing assembly recess (122) where the detonation cord connects to the firing head assembly (not shown).
  • Figure 5 illustrates the exit cavities (120) corresponding to the charge sockets (114).
  • the exit cavity (120) can have therein or associated therewith an accelerator or performance enhancer to provide a cleaner perforation tunnel, as well as a longer, bigger and better defined fraction or perforation.
  • the accelerator or performance enhancer can be any appropriate stimulator, such as for example, a jet fuel product.
  • the accelerator or performance enhancer can be in any form, such as for example, a solid, liquid, wax or combinations thereof.
  • Such an accelerator or performance enhancer can be built into the exit cavity (120), can be placed in the exit cavity (120), or associated with the exit cavity (120) so as to provide a cleaner perforation tunnel, as well as a longer, bigger and better defined fraction or perforation.
  • the structure and/or configuration of the charge socket (114) enhances the explosive characteristics associated with the present disclosure.
  • the structure and/or configuration of the charge socket (114) confines the explosive charge characteristics thereby increasing the charge performance.
  • Figure 7 sets forth a drawing illustrating a detailed view of region three of the wellbore subassembly (100) with perforating gun according to the embodiments of present invention from Figure 4.
  • the firing head assembly that is positioned in the firing recess (122) in the example of Figure 7 is actuated by fluid pressure in the interior space (106).
  • the fluid pressure in the interior space (106) is typically controlled by the well operator at the surface of the well. Varying the pressure applied to the tubular string at the surface varies the pressure in the interior space (106) of the wellbore subassembly (100), which is a component of the tubular string.
  • the pressure of the interior space (106) is communicated to the firing head assembly in the firing assembly recess (122) through hollowed passage (138) and through burst disc (140).
  • the burst disc (140) of Figure 7 is designed as a pressure barrier between the interior space (106) and the hollowed passage (138).
  • the burst disc (140) ruptures, thereby communicating the pressure of the interior space (106) into the hollowed passage (138) and then into the firing assembly in the firing assembly recess (122).
  • the firing assembly in the firing assembly recess (122) then ignites the detonation cord, which in turn detonates the perforated charges in the charge sockets as the detonation cord burns through the cavity.
  • the hollowed passage (138) extends through the wall (104) from the firing assembly recess (122) beyond the burst disc (140) to the interchangeable end adapter (126b).
  • the portion of the hollowed passage (138) to the left of the burst disc (140) in Figure 7 is used to communicate fluid pressure through interior space (106) to the firing assembly recess (122).
  • the portion of the hollowed passage (138) to the right of the burst disc (140) in Figure 7 is the result of machining the hollowed passage (138) through the wall (104).
  • plug (142) is used to seal the passage (138) so that pressure from the interior space (106) is communicated to the firing assembly in recess (122).
  • the portion of the hollowed passage (138) to the right of the burst disc (140) in Figure 7 may not be present in embodiments where the passage (138) to the burst disc (140) is created by drilling from the firing assembly recess (122) on the left of Figure 7.
  • the portion of the passage (138) of Figure 7 that extends downward to the burst disc (140) from the top of the wall (104) is created by machining a hole from the top of the wall (104) to the interior space (106).
  • the top of the passage (138) is capped by a plug (144).
  • the burst disc (140) of Figure 7 rests in the bottom of the passage (138), thereby creating a barrier between the passage (138) and the interior space (106) until the burst disc (140) ruptures due to an increase in the pressure differential between the passage (138) and the interior space (106).
  • the wellbore subassembly (100) detonates the perforating charges using a fluid pressure signal in the form of an increase in pressure through the tubular string, and in turn the interior space (106), sufficient to rupture the burst disc (140) and actuate the firing head assembly.
  • the burst disc (140) operates as a hydraulic pressure valve that opens when the pressure differential reaches a certain predetermined threshold that is high enough to avoid accidental firing of the firing head assembly.
  • Other structures and mechanisms for initiating detonation of the perforating charges as will occur to those of skill in the art may also be useful.
  • an electrical conductor may be operatively connected to the firing assembly in the firing assembly recess (122).
  • the electrical conductor may communicate an electrical signal from the surface to the firing assembly, which in turn initiates detonation of the perforating charges based on receipt of the signal.
  • the firing assembly may be operatively connected to a radio frequency receiver.
  • the radio frequency receiver may receive a radio frequency signal originating from a well operator on the surface. In response to receiving the radio frequency signal, the radio frequency receiver may, in turn, transmit a detonation signal to the firing head assembly to initiate detonation of the perforating charges.
  • Fiber optic technology may also be useful for detonating the perforating charges, especially in formations where the magnetic characteristics of the formation reduce the reliability of the electric or radio frequency signaling.
  • the firing assembly may be operatively connected to a fiber optic receiver.
  • the fiber optic receiver may receive a fiber optic signal originating from a well operator on the surface.
  • the fiber optic receiver may, in turn, transmit a detonation signal to the firing head assembly to initiate detonation of the perforating charges.
  • the example of Figure 7 utilizes hydraulic pressure to initiate the detonation of the perforating charges.
  • pneumatic pressure values may be more appropriate. Such embodiments may operate similarly to the hydraulic version described with reference to Figure 7.
  • One or more pneumatic pressure values may be actuated by a pneumatic pressure signal.
  • the pneumatic pressure values may communicate pneumatic pressure to the firing assembly to initiate detonation of the perforating charge in response to the pneumatic pressure signal.
  • the pneumatic pressure signal may be implemented as a certain threshold level of pneumatic pressure or a certain sequence of particular pressure levels.
  • Figure 8 sets forth a drawing illustrating B-B sectional view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention from Figure 2.
  • Figure 8 depicts the burst disc (140) that operates as a barrier between interior space (106) and the hollowed passage (138).
  • the hollowed passage is formed to communicate fluid pressure from the interior space (106) to the firing assembly in the firing assembly recess.
  • the burst disc (140) in example Figure 8 is configured at the bottom of the hollow passage (138) and is capped off from the exterior space (108) using plug (144).
  • Figure 9 sets forth a drawing illustrating a detailed view of region four of the B-B sectional view in Figure 8.
  • Figure 9 shows the burst disc (140) adjacent to and exposed to the interior space (106) of the tubular body.
  • the burst disc (140) of Figure 9 operates as a pressure barrier between the hollowed passage (138) and the interior space (106).
  • Figure 9 also illustrates the hollowed passage (138) used to communicate fluid pressure through the ruptured burst disc (140) to the firing head assembly in the firing assembly recess. As shown in Figure 9, the hollowed passage (138) is blocked from the exterior space (108) by plug (144).
  • the hollowed passage (138) includes a circular channel that extends from the portion of the hollow passage (138) containing the burst disc (140) to the firing assembly recess in the wall of the tubular body.
  • Figure 10 sets forth a drawing illustrating the C-C sectional view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention of Figure 2.
  • Figure 10 depicts the firing assembly recess (122) that holds the firing head assembly.
  • Figure 10 also illustrates the hollowed passage (136) that connects the firing assembly recess (122) to the cavity.
  • the detonation cord that is configured along the cavity is connected to the firing head assembly in the firing assembly recess (122) through the hollowed passage (136).
  • Figure 11 sets forth a drawing illustrating the D-D sectional view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention of Figure 2.
  • Figure 11 illustrates the relative position of the different rows of the "S" shaped cavity (100) in which the perforating charges are configured.
  • the first row of perforating charges is contained along the portion of the cavity designated as using reference number 11 Oa; the second row of perforating charges is contained along the row of the cavity designated using reference number 110b; and the third row of the cavity containing perforated charges is designated using reference number HOc. Because the perforating charges in the cavity (110) are offset from one another so that no charge lies along the same sectional plane as another perforating charge, Figure 11 only illustrates perforating charge (112a) in socket (114a).
  • the perforating charge (112a) in the example of Figure 11 detonates toward the interior space (106) and through the wall (104) at the location across from the interior space from the socket (114a), i.e., the wall target.
  • the perforating charge (112a) detonates toward and into the interior space (106) and through exist recess (12Oq) and into the exterior space (108).
  • the detonation punctures the inner liner (134) as the discharge passes into and out of the interior space (106).
  • the inner liner (134) helps to protect the other perforating charges in the other charge sockets along the tubular body from damage created by the forces generated as the perforating charge (112a) detonates.
  • Figure 12 sets forth a drawing illustrating an exploded view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention of Figure 2.
  • Figure 12 illustrates the various components utilized in the well bore subassembly (100).
  • the wellbore subassembly (100) of Figure 12 includes tubular body (102).
  • the tubular body (102) of Figure 12 has a wall (104) defining an interior space (106) and exterior space (108).
  • the wall (104) has a cavity (110) that extends longitudinally along the length of the tubular body of (102) in the example of Figure 12.
  • the cavity (110) in Figure 12 is configured in an "S" shaped pattern through the wall (104) to form three rows of charge sockets (114) longitudinally along the length of the tubular body (102).
  • Each charge socket (114) receives only a single perforating charge (112), and a detonation cord runs through the cavity (110) along the tops of the perforating charges (112) in the charge sockets (114) of Figure 12.
  • the perforating charges (112) are held in place via gaskets.
  • the perforating charge (112a) is secured in place in socket (114a) using o-ring (162).
  • the detonation cord that is configured along the tops of the perforating charges in the cavity (110) of Figure 12 is ignited by a firing head assembly (124) configured in the firing assembly recess (122).
  • the detonation cord connects to the firing head assembly (124) in the firing assembly recess (122) through a hollow passage (136) in the wall (104).
  • the firing assembly (124) is configured longitudinally in the wall (104) of the tubular body (102).
  • the firing assembly (124) is placed into the firing assembly recess (122) from the outside of the well bore subassembly (100).
  • the firing assembly (124) of Figure 12 is secured in place via a firing assembly sleeve (160).
  • the firing assembly sleeve (160) of Figure 12 rotates to expose the firing assembly recess (122) to the exterior space (108) via window (164).
  • the firing assembly sleeve (160) is rotated so the window (164) is toward the bottom of the tubular body (102) and the wall of the firing assembly sleeve (160) protects the firing assembly (124) from conditions in the exterior space (108).
  • the firing assembly sleeve (160) is held into place by eight screws inserted through holes (166) when the holes (166) of the firing assembly sleeve (160) line up with holes (168) in the tubular body (102).
  • the firing assembly sleeve (160) of Figure 12 is for example only and not for limitation.
  • the firing assembly (124) is actuated based on a pressure signal received from the interior space (106).
  • the firing assembly (124) of Figure 12 operatively connects to interior space (106) through hollowed passage (138).
  • the hollowed passage (138) of Figure 12 is blocked from the interior space (106), however, by a burst disc (140).
  • the burst disc (140) of Figure 12 is ruptured when the pressure differential between the pressure of the interior space (106) exceeds the pressure in hollowed passage (138) by predetermined amount.
  • the burst disc (140) ruptures and the fluid pressure in the interior space (106) is communicated through the hollowed passage (138) to the firing assembly (124) in the recess (122).
  • the fluid pressure from the interior space (106) is communicated to the firing assembly (124) in the recess (122) because the other open ends of the hollowed passage (138) are capped by plugs (142, 144).
  • the detonation cord that extends along the cavity (110) begins igniting each perforating charge (112) in series. As each perforating charge ignites, pressure is created in the interior space (106) of Figure 12. To prevent the pressure from the explosion of each charge from deforming the tubular body (102) near the cavity (110) containing the perforating charges, the tubular body (102) includes the inner liner (134). In this manner, the inner liner (134) in the example of Figure 12 operates to reinforce the structural integrity of the tubular body (102).
  • the tubular body (102), in the example Figure 12 also includes a removable outer layer (118).
  • the removable outer layer (118) of Figure 12 is a cylindrical shell that protects the perforated charges (112) from the exterior environment (108).
  • the removable outer layer (118) of Figure 12 is typically installed on the wellbore subassembly (100) after the perforated charges are configured inside the charge sockets along the cavity (110).
  • the tubular body in the example Figure 12 includes interchangeable end adapters (126a) and (126b). Theses removable end adapters (126) allow the wellbore subassembly (100) to be installed in a variety of different tubular strings. Different wellbore strings may use different threads between components in a string. The use of interchangeable end adapters (126) allows the wellbore subassembly (100) to design the middle portion of the tubular body (102) with one interface that mates with all varieties of interchangeable end adapters.
  • the threads of the middle portion of the tubular body (102) at interface (128a) match the threads of the of the interchangeable end adapters (126a), and all interchangeable end adapters may be designed with the same thread specifications as the threads at interface (128a).
  • all interchangeable end adapters are capable of connecting to the middle portion of the tubular body (102).
  • the interface of the interchangeable end adapters that allow the wellbore subassembly (100) to connect with the adjacent components of a tubular string may vary in size and shape from one end adapter to another to provide a way of connecting the wellbore subassembly (100) with a variety of tubular strings.
  • Using the interchangeable end adapters therefore, allows for the design and manufacture of one wellbore subassembly (100), with the exception of interchangeable end adapters, that can be installed in any tubular string.
  • the firing assembly (124) is secured in the firing assembly recess (122) using a firing assembly sleeve (160).
  • a firing assembly sleeve 160
  • Other mechanisms for securing the firing head assembly in the firing assembly recess may also be useful such as, for example, using clamps.
  • Figure 13 sets forth a drawing illustrating a wellbore subassembly (200) with perforating gun according to the embodiments of the present invention in which the firing assembly is secured within the firing assembly recess using clamps (202).
  • the wellbore subassembly (200) with perforating gun in example of Figure 13 is similar to the wellbore subassembly (100) of Figure 12.
  • the tubular body (102) includes clamps (202) that fit into slots (206) on the tubular body (102).
  • the clamps (202) of Figure 13 are secured by screws that pass through holes (204) securing the clamps (202) in slots (206).
  • the firing assembly (124) of Figure 13 is secured between the row of clamps labeled (202a) and the row of clamps labeled (202b) in the firing assembly recess (208).
  • the cavity in the wellbore subassembly (100) is configured using an "S" shaped pattern.
  • Figures 14-18 illustrate the "S" shaped pattern of the cavity (110) in the wall of the tubular body (102) of the wellbore subassembly (100).
  • the "S" shaped cavity (110) in Figures 14-18 form three rows of charge sockets.
  • Figure 14 sets forth a drawing illustrating a top orthogonal view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 14 depicts the first row of the charge sockets in the "S" shaped cavity (110).
  • the "S" shaped cavity (110) through the wall (104) of Figure 14 curves up clockwise on the left end of the tubular body (102) from the first row of charge sockets toward the second row of charge sockets not shown from the view of Figure 14.
  • Figure 15 sets forth a drawing illustrating the elevation view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 15 depicts the third row of charged sockets formed by the cavity (110) inside the wall (104) of the tubular body (102).
  • the "S" shaped cavity (110) through the wall (104) curves up counter-clockwise on the right end of the tubular body (102) toward the third row of charge sockets from the second row of charge sockets not shown from the view of Figure 15.
  • Figure 16 sets forth a drawing illustrating the bottom view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 16 illustrates both the second and third rows of the charge sockets formed by the cavity (110) inside the wall (104) of the tubular body (102).
  • the "S" shaped cavity (110) through the wall (104) curves up clockwise on the left end of the tubular body (102) and extends toward the right end of the tubular body (102) to form the second row of charge sockets.
  • the "S" shaped cavity (110) then curves up counter-clockwise on the right end of the tubular body (102) and extends toward the left end of the tubular body (102) to form the third row of charge sockets.
  • Figure 17 sets forth a drawing illustrating the right view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 17 includes a directional arrow identified in Figure 17 as the "path view.”
  • the path view is essentially the top view of the wellbore subassembly (100) rotated sixty degrees to provide a view that includes both the first and second row of charge sockets.
  • Figure 18 sets forth a drawing illustrating the path view the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention without the interchangeable end adapters.
  • Figure 18 depicts the first and second rows of charge sockets formed by the cavity (110) inside the wall (104) of the tubular body (102).
  • the "S" shaped cavity (110) begins at the right end of the tubular body (102) and extends toward the left end of the tubular body (102) to form the first row of charge sockets.
  • the "S" shaped cavity (110) then curves up clockwise on the left end of the tubular body (102) and extends toward the right end of the tubular body (102) to form the second row of charge sockets.
  • the "S” shaped cavity (110) then curves up counter-clockwise on the right end of the tubular body (102) toward the third row of charge sockets not shown from the view of Figure 18.
  • Figures 14-18 illustrate a cavity configured in an "S" shaped pattern within the wall of the wellbore subassembly with perforating gun according to embodiments of the present invention
  • the cavity may be configured in other ways as will occur to those of skill in the art.
  • Figure 19 sets forth a drawing illustrating a top orthogonal view of a wellbore subassembly (210) with perforating gun according to embodiments of the present invention.
  • the removable outer layer is not shown in order to expose the cavity (212).
  • the cavity (212) of Figure 19 is configured in a spiral pattern within and along the wall of the tubular body (218).
  • the cavity (212) is shaped to define charge sockets (214), and each charge socket (214) receives only a single perforating charge.
  • the tubular body (218) also includes exit cavities (216). Similar to the charge sockets (214), these exit cavities (216) of Figure 19 are also configured in a spiral pattern longitudinally along the tubular body (218).
  • Figure 20 sets forth a drawing illustrating an elevation view of the wellbore subassembly (210) with perforating gun according to embodiments of the present invention.
  • the view of Figure 20 depicts certain portions of the cavity (212) and certain exit cavities (216) that are not visible in Figure 19. That is, Figure 20 continues to illustrate the spiral shaped pattern formed from the cavity (212) and sockets (212), as well as the exit cavities (216).
  • the "S" shaped and spiral shaped cavities described herein are for explanation only, not for limitation.
  • a wellbore subassembly according to embodiments of the present invention may utilize cavities shaped in any pattern as will occur to those of skill in the art.
  • exemplary wellbore assemblies according to embodiments of the present invention described herein utilize only a single cavity to form the "S" shaped pattern or the spiral pattern, this is for explanation only and not for limitation.
  • a wellbore subassembly according to embodiments of the present invention may utilize any number of cavities.
  • Figures 21 through 23 show cross sections of the tubular body (102) of the wellbore subassembly (100) of Figure 15.
  • Figure 21 sets forth a drawing illustrating the E-E sectional view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention of Figure 15.
  • Figure 21 depicts a perforating charge (112) configured in the charge socket (114) from the first row of charge sockets in cavity (110) from Figure 15.
  • Perforating charge (112) discharges toward the interior space (106) through the inner liner (134) and penetrates into the exterior space (108) through the inner liner (134) and exit recess (120) by perforating the wall (104) across the interior space (106) from the location of the perforating charge (112).
  • the discharge from the perforating charge (112) punctures the inner liner (134) as it passes through exit recess (120) into the exterior space (108). In this manner, the perforating charge (112) in Figure 21 discharges along the arrow shown in Figure 21.
  • Figure 21 does not depict the removable outer layer (118).
  • the removable outer layer secures the perforating charge (112) in the socket (114) and protects the perforating charge (112) from conditions in the exterior space (108). Upon discharge, the perforating charge (112) also punctures the removable outer layer at the location of the exit recess (120).
  • Figure 22 sets forth a drawing illustrating the F-F sectional view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention of Figure 15.
  • Figure 22 depicts a perforating charge (112) in a charge socket (114) formed in the second row of the cavity (110).
  • the perforating charge in Figure 22 is configured to discharge toward the interior space and penetrate into the exterior space by perforating the wall across from the interior space from location of the perforating charge (112). That is, the perforating charge in Figure 22 discharges along the arrow shown in Figure 22 through the inner liner (134), the exit cavity (120), and the removable outer layer (not shown) in Figure 22.
  • Figure 23 sets forth a drawing illustrating the G-G sectional view of the wellbore subassembly (100) with perforating gun according to the embodiments of the present invention of Figure 15.
  • Figure 23 depicts a perforating charge (112) in a charge socket (114) formed in the third row of the cavity (110). Similar to the perforating charge (112) in Figure 21, the perforating charge in Figure 23 is configured to discharge toward the interior space and penetrate into the exterior space by perforating the wall across from the interior space from location of the perforating charge (112). That is, the perforating charge in Figure 23 discharges along the arrow shown in Figure 23 through the inner liner (134), the exit cavity (120), and the removable outer layer (not shown) in Figure 23.
  • FIG. 21-23 illustrate the exit cavities (120) corresponding to the charge sockets (114).
  • the exit cavity (120) can have therein or associated therewith an accelerator or performance enhancer to provide a cleaner perforation tunnel, as well as a longer, bigger and better defined fraction or perforation.
  • the accelerator or performance enhancer can be any appropriate stimulator, such as for example, a jet fuel product. Further, the accelerator or performance enhancer can be in any form, such as for example, a solid, liquid, wax or combinations thereof.
  • Such an accelerator or performance enhancer can be built into the exit cavity (120), can be placed in the exit cavity (120), or associated with the exit cavity (120) so as to provide a cleaner perforation tunnel, as well as a longer, bigger and better defined fraction or perforation.
  • the structure and/or configuration of the charge socket (114) enhances the explosive characteristics associated with the present disclosure.
  • the structure and/or configuration of the charge socket (114) confines the explosive charge characteristics thereby increasing the charge performance.
  • Figure 24 sets forth a drawing illustrating several wellbore subassemblies (308, 310, 312, 314) with perforating guns according to the embodiments of the present disclosure that are conveyed along a casing string of a horizontal well.
  • Figure 24 depicts a casing string (300) conveyed through a bore hole (302) that penetrates and turns through a geological formation (304).
  • the casing string (300) is secured in the bore hole (302) using cement (306), which is optional.
  • the casing string (300) in Figure 24 includes four wellbore subassemblies (308, 310, 312, 314) with perforating guns according to the embodiments of the present invention.
  • the perforating charges in the each of the wellbore subassemblies (308, 310, 312, 314) may be detonated individually or concurrently together in a group.
  • the perforating charges puncture the optional concrete (306) annulus surrounding the casing string (300) and penetrate into the formation (304) at a point adjacent to the respective wellbore subassembly.
  • fracing or other completion processes may be used to prepare the well for extraction of hydrocarbons in the adjacent areas of the formation (304).
  • the arcuate and lateral portions of the borehole (302) create specific problems, especially with respect to perforating. However, these problems are resolved with the use of the apparatus and methods of the present disclosure. Further, the longer the lateral portions of the borehole (302), the more difficult it is to achieve effective perforations. Not so with the use of the apparatus and methods of the present disclosure. Thus, as drilling practices are directed more toward directional drilling, and directional drilling creates more and longer lateral well bores, the need for the effective perforating techniques as defined in the present disclosure increase.
  • the perforating apparatus and methods defined in this disclosure provide enhanced perforating characteristics because of the structure of the apparatus.
  • the present perforating apparatus and methods do not require secondary control lines that extend to the surface, and are easy to install and use.
  • the present perforating apparatus and methods result in a truly "disappearing" perforating gun that is unobtrusive after it has been used.
  • the characteristics of the perforation achieved by the present disclosure are greatly enhanced. Particularly, the achievement of a continuous, normal perforation, free from disruption, has been achieved.
  • the perforating apparatus and methods defined in this disclosure use existing charges to enhance the capacity and forcefulness of the perforation. Still further, the present perforating apparatus and methods reduce the costs, are less time consuming, reduce the manpower needs and is significantly less prone to safety problems.

Abstract

La présente invention porte sur un sous-ensemble de puits de forage avec un canon perforateur. Le sous-ensemble de puits de forage comprend un corps tubulaire et une charge de perforation. Le corps tubulaire présente une paroi définissant un espace intérieur et un espace extérieur, et la paroi possède une cavité. Dans certains modes de réalisation, la cavité peut être conformée de façon à définir un culot de charge qui ne reçoit qu'une seule charge de perforation. La charge de perforation est configurée dans la cavité à un emplacement à l'intérieur de la paroi. La charge de perforation est configurée de façon à produire une décharge vers l'espace intérieur et dans celui-ci, et à pénétrer dans l'espace extérieur en perforant la paroi à travers l'espace intérieur à partir de l'emplacement de la charge de perforation.
EP10802015.7A 2009-07-24 2010-07-23 Sous-ensemble de puits de forage avec un canon perforateur Withdrawn EP2456950A4 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22846009P 2009-07-24 2009-07-24
US23046809P 2009-07-31 2009-07-31
US25737409P 2009-11-02 2009-11-02
PCT/IB2010/002163 WO2011010223A2 (fr) 2009-07-24 2010-07-23 Sous-ensemble de puits de forage avec un canon perforateur

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EP2456950A2 true EP2456950A2 (fr) 2012-05-30
EP2456950A4 EP2456950A4 (fr) 2017-08-02

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EP10802015.7A Withdrawn EP2456950A4 (fr) 2009-07-24 2010-07-23 Sous-ensemble de puits de forage avec un canon perforateur

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AU (1) AU2010274656B2 (fr)
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Publication number Priority date Publication date Assignee Title
CA2915624C (fr) 2015-12-18 2022-08-30 Modern Wellbore Solutions Ltd. Ensemble d'outil et procede de forage de puits ramifies ou multilateraux a l'aide de sifflet deviateur

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US2773424A (en) 1951-06-01 1956-12-11 Mordica O Johnston Gun perforator
US3106130A (en) * 1958-08-28 1963-10-08 Schlumberger Well Surv Corp Perforating apparatus
US3327793A (en) * 1964-11-19 1967-06-27 Dresser Ind Multiple-shot bullet gun for perforating well casing
US4756371A (en) * 1986-12-15 1988-07-12 Brieger Emmet F Perforation apparatus and method
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US5660232A (en) * 1994-11-08 1997-08-26 Baker Hughes Incorporated Liner valve with externally mounted perforation charges
US6536524B1 (en) * 1999-04-27 2003-03-25 Marathon Oil Company Method and system for performing a casing conveyed perforating process and other operations in wells
RU2185498C1 (ru) * 2000-12-14 2002-07-20 ОАО "Сибнефть-Ноябрьскнефтегазгеофизика" Корпус кумулятивного перфоратора
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AU2010274656B2 (en) 2015-01-22
AU2010274656A1 (en) 2012-02-16
EP2456950A4 (fr) 2017-08-02
WO2011010223A2 (fr) 2011-01-27
WO2011010223A3 (fr) 2011-04-07

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