CA2887740C - Apparatus for creating and customizing intersecting jets with oilfield shaped charges - Google Patents
Apparatus for creating and customizing intersecting jets with oilfield shaped charges Download PDFInfo
- Publication number
- CA2887740C CA2887740C CA2887740A CA2887740A CA2887740C CA 2887740 C CA2887740 C CA 2887740C CA 2887740 A CA2887740 A CA 2887740A CA 2887740 A CA2887740 A CA 2887740A CA 2887740 C CA2887740 C CA 2887740C
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- CA
- Canada
- Prior art keywords
- support
- barrel
- shaped charges
- strips
- charge
- 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.)
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- 239000002184 metal Substances 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims 2
- 238000005755 formation reaction Methods 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002360 explosive Substances 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/119—Details, e.g. for locating perforating place or direction
Abstract
A geological perforating tool (gun) shape charges disposed at an angle that provides an improvement over other known embodiments by accurately securing the charges in the tool to facilitate reliable, reproducible focus of the shaped charges. Charges are disposed on metal strips fitted into slots that are precision cut at predetermined angles in a tool barrel circumference.
Description
Apparatus for Creating and Customizing Intersecting Jets with Oilfield Shaped Charges Background Field of the Invention The present invention relates generally to perforation guns that are used in the oil and gas industry to explosively perforate well casing and underground hydrocarbon bearing formations, and more particularly to an improved apparatus for explosively perforating a well casing and its surrounding underground hydrocarbon bearing formation in intersecting perforations.
Background A common method of perforating oil bearing geological formations is by shooting holes through the well casing by means of a special gun that is lowered into the hole.
"During the completion of an oil and/or gas well, it is common to perforate the hydrocarbon containing formation with explosive charges to allow inflow of hydrocarbons to the well bore. These charges are loaded in a perforation gun and are typically shaped charges that produce an explosive formed penetrating jet in a chosen direction" US 7,441,601.
The employment of angled shape charge placement to provide intersecting perforations has generated great interest in recent years. See for example, Triple-fer"
Perforating System, a paper by Halliburton, Bersas, et al, Perforation on Target, Oilfield Review, and New practices to Enhance Perforating Results, Oilfield Review. (all included in the information Disclosure material of this application).The intersecting perforation assist in cleaning the debris from the perforated channel and are especially useful where there is crushed or loose material adjacent the well bore where the perforation is to be made and in sand formations.
However there is needed a more reliable and effective tool for effecting angled perforations.
The present invention is such a tool.
Summary A geological perforating too (gun) with improved method of placing shape charges at an angle in the tool barrel that provides an improvement over other known embodiments by securely and accurately securing the charges in the tool to facilitate reliable, reproducible focus of the shaped charges at a variable distance into the formation.
Description of the Figures A more complete understanding of the method and apparatus of the present invention may be had by reference to the following detailed description when taken in conjunction with the accompanying drawings, wherein:
Figure 1 is a sectional view of an embodiment of a perforation gun assembly of the invention.
Figure 2 is an end view of the perforating gun shown in Figure 1.
Figure 3 is a perspective view of the barrel and shaped charges of an embodiment of the invention.
Figure 4 is aside view of the embodiment of Figure 3.
Figure 5 is a perspective view of a barrel of an embodiment of the invention showing placement of shaped charges on a support strip.
Figure 6 is a side view of a shaped charge suitable for use in embodiments of the invention.
All figures are drawn for ease of explanation of the basic teachings of the present invention only; the extensions of the figures with respect to number, position, relationship, and dimensions of the parts to form the preferred embodiment will be explained or will be within the skill of the art after the following teachings of the present invention have been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following teachings of the present invention have been read and understood.
Detailed Description This invention provides an improved tool (gun) and method of installing shaped charges at variable angles within a carrier assembly in order to cause two or more perforating tunnels to intersect at a prescribed distance outside of the well casing. All known current methods require special tooling that have long and costly lead times and are deficient in actually securing the angle of intercept. Embodiments of tools of the invention help to ensure that the charges
Background A common method of perforating oil bearing geological formations is by shooting holes through the well casing by means of a special gun that is lowered into the hole.
"During the completion of an oil and/or gas well, it is common to perforate the hydrocarbon containing formation with explosive charges to allow inflow of hydrocarbons to the well bore. These charges are loaded in a perforation gun and are typically shaped charges that produce an explosive formed penetrating jet in a chosen direction" US 7,441,601.
The employment of angled shape charge placement to provide intersecting perforations has generated great interest in recent years. See for example, Triple-fer"
Perforating System, a paper by Halliburton, Bersas, et al, Perforation on Target, Oilfield Review, and New practices to Enhance Perforating Results, Oilfield Review. (all included in the information Disclosure material of this application).The intersecting perforation assist in cleaning the debris from the perforated channel and are especially useful where there is crushed or loose material adjacent the well bore where the perforation is to be made and in sand formations.
However there is needed a more reliable and effective tool for effecting angled perforations.
The present invention is such a tool.
Summary A geological perforating too (gun) with improved method of placing shape charges at an angle in the tool barrel that provides an improvement over other known embodiments by securely and accurately securing the charges in the tool to facilitate reliable, reproducible focus of the shaped charges at a variable distance into the formation.
Description of the Figures A more complete understanding of the method and apparatus of the present invention may be had by reference to the following detailed description when taken in conjunction with the accompanying drawings, wherein:
Figure 1 is a sectional view of an embodiment of a perforation gun assembly of the invention.
Figure 2 is an end view of the perforating gun shown in Figure 1.
Figure 3 is a perspective view of the barrel and shaped charges of an embodiment of the invention.
Figure 4 is aside view of the embodiment of Figure 3.
Figure 5 is a perspective view of a barrel of an embodiment of the invention showing placement of shaped charges on a support strip.
Figure 6 is a side view of a shaped charge suitable for use in embodiments of the invention.
All figures are drawn for ease of explanation of the basic teachings of the present invention only; the extensions of the figures with respect to number, position, relationship, and dimensions of the parts to form the preferred embodiment will be explained or will be within the skill of the art after the following teachings of the present invention have been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following teachings of the present invention have been read and understood.
Detailed Description This invention provides an improved tool (gun) and method of installing shaped charges at variable angles within a carrier assembly in order to cause two or more perforating tunnels to intersect at a prescribed distance outside of the well casing. All known current methods require special tooling that have long and costly lead times and are deficient in actually securing the angle of intercept. Embodiments of tools of the invention help to ensure that the charges
2 collide at the prescribed location outside of the casing. The disclosed apparatus (tool) is comprised of a support strip that is welded or otherwise secured into a tubular support. The spacing between each charge on the support can be adjusted and the flat support base can be inserted at various angles within the support member to accurately control the point of intersection. This flat surface provides a solid base for securing the shaped charge and the round tubing provide the structure needed to form a rigid geometric frame. A
flat support strip is described and preferred but concave or convex geometries can also be utilized as the support base to optimize charge performance. This system provides an improvement over other known embodiments by securely and accurately focusing the shaped charges at a variable distance into the formation.
In broad scope the perforating tool of this invention comprises;
a cylindrical barrel having angled circular cutouts for placement of shaped charges in shape charge cases;
support strips comprising metal strips with a centered hole to receive a shape charge case, wherein the shape charge case has a circumferential projection that will not pass through the hole and provides support for a shaped charge case on the strip;
slots cut into the cylindrical barrel to support the edges of the support strips, cut at a predetermined angle to provide location for perforations from the shaped charges.
Referring to Figures 1-5 there is illustrated the gun assembly, 100, of an embodiment of the invention. As shown there is the cylindrical gun body, 130, with the barrel (load tube) 126 disposed inside. The barrel, 126, has multiple precision cut slots, 127 that allow the charge case 124 to be inserted into the barrel 126 and subsequently rest on the support strip 128. The holes may be located on any side of the circumference of the barrel to achieve the desired target perforations. The holes are preferably cut through the barrel wall at an angle perpendicular (900) to the plane of the orientation of the support strip. A shaped charge case, 124, is disposed in a hole in a support strip (128), resting on a projection, 135, on the circumference of the charge case (see Figures 5 and 6). The shape charge case (Figure 6) has a projection 135 that is larger diameter than the hole in the support strip so that the bottom of this projection (135) rest on the sided of the hole in the support strip. The charge is connected to a detonating cord
flat support strip is described and preferred but concave or convex geometries can also be utilized as the support base to optimize charge performance. This system provides an improvement over other known embodiments by securely and accurately focusing the shaped charges at a variable distance into the formation.
In broad scope the perforating tool of this invention comprises;
a cylindrical barrel having angled circular cutouts for placement of shaped charges in shape charge cases;
support strips comprising metal strips with a centered hole to receive a shape charge case, wherein the shape charge case has a circumferential projection that will not pass through the hole and provides support for a shaped charge case on the strip;
slots cut into the cylindrical barrel to support the edges of the support strips, cut at a predetermined angle to provide location for perforations from the shaped charges.
Referring to Figures 1-5 there is illustrated the gun assembly, 100, of an embodiment of the invention. As shown there is the cylindrical gun body, 130, with the barrel (load tube) 126 disposed inside. The barrel, 126, has multiple precision cut slots, 127 that allow the charge case 124 to be inserted into the barrel 126 and subsequently rest on the support strip 128. The holes may be located on any side of the circumference of the barrel to achieve the desired target perforations. The holes are preferably cut through the barrel wall at an angle perpendicular (900) to the plane of the orientation of the support strip. A shaped charge case, 124, is disposed in a hole in a support strip (128), resting on a projection, 135, on the circumference of the charge case (see Figures 5 and 6). The shape charge case (Figure 6) has a projection 135 that is larger diameter than the hole in the support strip so that the bottom of this projection (135) rest on the sided of the hole in the support strip. The charge is connected to a detonating cord
3 (or other detonating means) at 139. The charge case is secured to the support strip (128,129) by any suitable means. In a prototype (and possible production model) there is a thin strip cut into the inside barrel wall that may be bent over to press against the top of the charge case projection and thus provide reversible securement means. The charge case may be secured by small clamps, by adhesive or by welding. Other means will be obvious to those skilled in the metal fabrication art.
The support strips (128,129) are inserted into slots cut into the barrel. The support strip will generally be flat metal pieces but may also be curved. Slots in the barrel are angled as desired to allow any configuration of slanted charge paths. If the support strips are metal (preferred) they will be welded into the slots, but they may also be attached by other means such as a strong adhesive, a locking mechanism built into the slots and support strips or any other means that will achieve a secure attachment as will be apparent to those skilled in the art. This arrangement of charge cases securely rested and secured on the support plates, together with the ability to angle the flat plated into the barrel at any desired angle provides the means of relatively simple, precise and reliable angled charge placemat and therefore perforation placement.
The barrel is secured in gun body at each end as shown in Figure 1 and 2 (125 and 132) or by other suitable means within the skill of those skilled in the art.
Computer aided laser machining greatly facilitated the precision and reliability of the cuts needed in manufacturing the tools of embodiments of this invention, particularity the barrel cut openings (127) and the slots for the charge plate.
In operation the desired angles are predetermined to achieve the desired perforation intersection pattern and the barrel cuts designed and machined accordingly.
The barrel is disposed in a gun body for use in a well bore.
Although the invention hereof has been described by way of preferred embodiments, it will be evident that other adaptations and modifications can be employed without departing from the spirit and scope thereof. The terms and expressions employed herein have been used as terms of description and not of limitation; and thus, there is no intent of excluding equivalents, but on
The support strips (128,129) are inserted into slots cut into the barrel. The support strip will generally be flat metal pieces but may also be curved. Slots in the barrel are angled as desired to allow any configuration of slanted charge paths. If the support strips are metal (preferred) they will be welded into the slots, but they may also be attached by other means such as a strong adhesive, a locking mechanism built into the slots and support strips or any other means that will achieve a secure attachment as will be apparent to those skilled in the art. This arrangement of charge cases securely rested and secured on the support plates, together with the ability to angle the flat plated into the barrel at any desired angle provides the means of relatively simple, precise and reliable angled charge placemat and therefore perforation placement.
The barrel is secured in gun body at each end as shown in Figure 1 and 2 (125 and 132) or by other suitable means within the skill of those skilled in the art.
Computer aided laser machining greatly facilitated the precision and reliability of the cuts needed in manufacturing the tools of embodiments of this invention, particularity the barrel cut openings (127) and the slots for the charge plate.
In operation the desired angles are predetermined to achieve the desired perforation intersection pattern and the barrel cuts designed and machined accordingly.
The barrel is disposed in a gun body for use in a well bore.
Although the invention hereof has been described by way of preferred embodiments, it will be evident that other adaptations and modifications can be employed without departing from the spirit and scope thereof. The terms and expressions employed herein have been used as terms of description and not of limitation; and thus, there is no intent of excluding equivalents, but on
4 the contrary it is intended to cover any and all equivalents that may be employed without departing from the spirit and scope of the invention.
Claims (10)
1. A perforating tool comprising:
a cylindrical barrel having angled circular cutouts for placement of shaped charges in shape charge cases;
support strips comprising metal strips with a centered hole to receive a shape charge case, wherein the shape charge cases have a circumferential projection that will not pass through the hole and which provides support for a shaped charge case on the strip;
slots cut into the cylindrical barrel to support the edges of the support strips, cut at a predetermined angle to provide angled direction for perforations in a geological formation from explosion of the shaped charges.
a cylindrical barrel having angled circular cutouts for placement of shaped charges in shape charge cases;
support strips comprising metal strips with a centered hole to receive a shape charge case, wherein the shape charge cases have a circumferential projection that will not pass through the hole and which provides support for a shaped charge case on the strip;
slots cut into the cylindrical barrel to support the edges of the support strips, cut at a predetermined angle to provide angled direction for perforations in a geological formation from explosion of the shaped charges.
2. The perforating tool of claim 1 wherein there is a thin strip cut into the inside barrel wall that may be bent over to press against the top of a charge case projection to provide reversible securement means.
3. The perforating tool of claim 1 wherein the charge cases are secured to the support strip by small clamps, by adhesive or by welding.
4. The perforating tool of claim 1 wherein slots in the barrel are produced by computer aided laser machining.
5. The perforating tool of claim 1 wherein the support strips are curved.
6. The perforating tool of claim 1 wherein the support strips are welded into the slots in the barrel.
7. The perforating tool of claim 1 wherein there is provides means to attach the barrel with shaped charges into a well casing string.
8. A method of producing intersecting perforations in a geological formation comprising providing a perforating gun disposed at a desire location comprising:
a cylindrical barrel having angled circular cutouts for placement of shaped charges in shape charge cases;
support strips comprising metal strips with a centered hole to receive a shape charge case, wherein the shape charge cases have a circumferential projection that will not pass through the hole and which provides support for a shaped charge case on the strip;
slots cut into the cylindrical barrel to support the edges of the support strips, cut at a predetermined angle to provide angled direction for perforations in a geological formation from explosion of the shaped charges; and detonating the shaped charges.
a cylindrical barrel having angled circular cutouts for placement of shaped charges in shape charge cases;
support strips comprising metal strips with a centered hole to receive a shape charge case, wherein the shape charge cases have a circumferential projection that will not pass through the hole and which provides support for a shaped charge case on the strip;
slots cut into the cylindrical barrel to support the edges of the support strips, cut at a predetermined angle to provide angled direction for perforations in a geological formation from explosion of the shaped charges; and detonating the shaped charges.
9. The method of claim 8 wherein the charge cases are secured to the support strip by thin strips cut into the inside barrel wall that may be bent over to press against the top of a charge case, or by small clamps, or by adhesive or by welding.
10. The method of claim 8 wherein the support strips are welded into the slots in the barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2887740A CA2887740C (en) | 2015-04-09 | 2015-04-09 | Apparatus for creating and customizing intersecting jets with oilfield shaped charges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2887740A CA2887740C (en) | 2015-04-09 | 2015-04-09 | Apparatus for creating and customizing intersecting jets with oilfield shaped charges |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2887740A1 CA2887740A1 (en) | 2016-10-09 |
| CA2887740C true CA2887740C (en) | 2018-04-03 |
Family
ID=57122304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2887740A Active CA2887740C (en) | 2015-04-09 | 2015-04-09 | Apparatus for creating and customizing intersecting jets with oilfield shaped charges |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2887740C (en) |
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2015
- 2015-04-09 CA CA2887740A patent/CA2887740C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2887740A1 (en) | 2016-10-09 |
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