US20150096434A1 - Sub-caliber shaped charge perforator - Google Patents
Sub-caliber shaped charge perforator Download PDFInfo
- Publication number
- US20150096434A1 US20150096434A1 US14/045,529 US201314045529A US2015096434A1 US 20150096434 A1 US20150096434 A1 US 20150096434A1 US 201314045529 A US201314045529 A US 201314045529A US 2015096434 A1 US2015096434 A1 US 2015096434A1
- Authority
- US
- United States
- Prior art keywords
- liner
- case
- shaped charge
- perforating
- opening
- 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.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
Abstract
A shaped charge for use in perforating a wellbore that includes a shaped charge case, a liner in the case, and explosive between the liner and case. Detonating the explosive inverts the liner to form a metal jet that forms a perforation in a side wall of the wellbore. The outer diameter of the liner open end is set radially inward from the inner diameter of the case opening to define an annular gap. Providing a gap between the liner and case allows more control of distribution of material of the liner into the jet.
Description
- 1. Field of Invention
- The present disclosure relates in general to a device for perforating a wellbore. More specifically, the present invention relates to a liner for a shaped charge having a liner inserted into a case, where a gap exists between the respective outer and inner diameters of the liner and case.
- 2. Description of Prior Art
- Perforating systems are used for the purpose, among others, of making hydraulic communication passages, called perforations, in wellbores drilled through earth formations so that predetermined zones of the earth formations can be hydraulically connected to the wellbore. Perforations are needed because wellbores are typically lined with a string of casing and cement is generally pumped into the annular space between the wellbore wall and the casing. Reasons for cementing the casing against the wellbore wall includes retaining the casing in the wellbore and hydraulically isolating various earth formations penetrated by the wellbore. Sometimes an inner casing string is included that is circumscribed by the casing. Without the perforations oil/gas from the formation surrounding the wellbore cannot make its way to production tubing inserted into the wellbore within the casing.
- Perforating systems typically include one or more perforating guns connected together in series to form a perforating gun string, which can sometimes surpass a thousand feet of perforating length. The gun strings are usually lowered into a wellbore on a wireline or tubing, where the individual perforating guns are generally coupled together by connector subs. Included with the perforating gun are shaped charges that typically include a housing, a liner, and a quantity of high explosive inserted between the liner and the housing. When the high explosive is detonated, the force of the detonation collapses the liner and ejects it from one end of the charge at very high velocity in a pattern called a jet that perforates the casing and the cement and creates a perforation that extends into the surrounding formation. Each shaped charge is typically attached to a detonation cord that runs axially within each of the guns.
- Provided herein are embodiments for perforating a wellbore. In one example, a shaped charge for use in perforating a wellbore is described that includes a case having an opening, a liner inserted into a space in the case and having an open end and an apex, explosive disposed between the liner and case, a hole in the apex of the liner, and a gap between an outer diameter of the open end of the liner and inner diameter of the opening in the case. The hole can optionally have a diameter that ranges from about 10% to about 82% of an axial length of the liner. Optionally, an outer diameter of the open end of the liner ranges from about 60% to about 75% of an inner diameter of the opening of the case. In an example, the hole ranges from about 7% of the liner outer diameter to about 60% of the liner outer diameter. The shaped charge can be selectively retained within a gun tube by a coupling that is provided with the case. In an alternate embodiment, the shaped charge is selectively disposed in the wellbore within a perforating string. The shaped charge can further include a slot on an end of the case opposite the opening that selectively receives a detonating cord, and an initiator in a passage formed through the case between the detonating cord and the explosive. A protective covering may optionally be included in the gap and over the explosive.
- Also disclosed herein is a shaped charge for use in perforating a wellbore that includes a case having an opening, a liner in the case, explosive between the liner and case, and a gap defined an outer diameter of the open end of the liner and inner diameter of the opening in the case, and having a diameter that ranges from about 60% to about 75% of the inner diameter of the opening in the case. A hole may be included in in an apex of the liner. In this example, the hole has a diameter that ranges from about 29% to about 82% of a length of the liner. The case can be fitted with a coupling to selectively mount the shaped charge in a perforating string, and the perforating string can be disposed in the wellbore. Further in this example, detonating the explosive causes the liner to form a metal jet that penetrates into a formation adjacent the wellbore to form a perforation.
- A method of perforating a wellbore is also provided herein that includes providing a shaped charge made up of a case having an opening, a liner inserted in the opening that comprises an apex, a hole in the apex, and an open end with an outer diameter spaced radially inward from an inner diameter of the opening to define an annular gap, and explosive between the liner and the case. The method further includes installing the shaped charge in a perforating gun, deploying the perforating gun in the wellbore, and detonating the explosive so that a detonation wave is generated that collapses the liner to form a metal jet that penetrates into a wall of the wellbore and perforates the formation. In an example of the method, the outer diameter of the liner ranges from about 60% to about 75% of the inner diameter of the opening. In another embodiment of the method, the hole ranges from about 15% of the liner outer diameter to about 44% of the liner outer diameter. The perforating gun of the example method can be a part of a perforating string that is deployed on a line, and wherein a detonating signal is transmitted from surface through the line and to perforating gun. Further optionally in the method, the shaped charge is mounted into a gun tube that is inserted in the perforating gun.
- Some of the features and benefits of the present invention having been stated, others will become apparent as the description proceeds when taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a side sectional view of an example of a shaped charge in accordance with the present invention. -
FIG. 2 is a side sectional view of an example of a perforating gun having the shaped charge ofFIG. 1 . -
FIG. 3 is a partial side sectional view of a perforating string in a wellbore made up of the perforating gun ofFIG. 2 . - While the invention will be described in connection with the preferred embodiments, it will be understood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents, as may be included within the spirit and scope of the invention as defined by the appended claims.
- The method and system of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings in which embodiments are shown. The method and system of the present disclosure may be in many different forms and should not be construed as limited to the illustrated embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey its scope to those skilled in the art. Like numbers refer to like elements throughout.
- It is to be further understood that the scope of the present disclosure is not limited to the exact details of construction, operation, exact materials, or embodiments shown and described, as modifications and equivalents will be apparent to one skilled in the art. In the drawings and specification, there have been disclosed illustrative embodiments and, although specific terms are employed, they are used in a generic and descriptive sense only and not for the purpose of limitation. Examples exist wherein the term “about” when used in conjunction with a cited value, defines the scope of the cited value to range from a value that is less than the cited value by an amount that is 5% of the cited value, and/or greater than the cited value by an amount that is 5% of the cited value. Ranges may be expressed herein as from about one particular value, and/or to about another particular value. When such a range is expressed, it is to be understood that another embodiment is from the one particular value and/or to the other particular value, along with all combinations within said range.
- Shown in side sectional view is one example of a
shaped charge 10 that is made up of ashaped charge case 12 and having anopening 13 on one end that opens up into a space within thecase 12. A thinwalled liner 14 shown inserted into theopening 13 and having an apex A directed towards a closed end of the space within thecase 12. Anopen end 15 ofliner 14, which is opposite apex A, is a plane that is generally parallel with a plane in which theopening 13 is disposed. The liner can be formed from a composition of particles pressed and held together with a ductile or malleable binder. A non-exhaustive list of particle material includes tungsten, molybdenum, depleted uranium, hafnium, copper, bismuth, tantalum, and combinations thereof. A non-exhaustive list of binder materials includes bismuth, zinc, tin, uranium, silver, gold, antimony, cobalt, copper, zinc alloys, tin alloys, nickel, copper, tungsten, palladium, and combinations thereof. - An explosive 16 is shown provided in the space within the
case 12 and between an outer surface of theliner 14 and inner surface of space. Examples of explosives include compositions sold under trade designations HMX, HNS, RDX, HNIW, PYX and TNAZ. Ahole 18 is shown formed through theliner 14 and proximate apexA. Example holes 18 can have a shape that is curved, circular, elliptical, and alike. Aprotective covering 20 is shown over the portion of the explosive 16 exposed tohole 18. In the example ofFIG. 1 , the outer diameter of the liner ODL is shown set radially inward (with respect to axis AX) from an inner diameter from the case IDC. The difference in length between the ODL and IDC defines a gap G that circumscribes an outer periphery of theliner 14 and adjacent itsopen end 15. Optionally, aprotective covering 22 is laid over the portion of the explosive 16 and at the surface of gap G. - A detonating
cord 24 is shown for providing detonation of explosive 16 withincase 12 where abooster charge 26 is shown extending through the end of thecase 12 and from the closed end of space and to adjacent thedetonation cord 24. Aslot 25 is formed in the end of thecase 12 opposite itsopening 13 and provides a place for insertion and retention of thedetonation cord 24. - In the example of
FIG. 1 , the offset between the outer diameter of liner ODL and inner diameter of case IDC defines what is sometimes referred to as a sub-caliber charge. In this example, the liner outer diameter ODL can range from about 60% to about 75% of the charge case inner diameter IDC. Optionally, the diameter ofhole 18 can have a value that ranges from about 29% to about 82% of a length L ofliner 14. An advantage of the configuration ofliner 14 is that more control of the distribution of material ofliner 14 into the jet is accomplished. - Shown in
FIG. 2 is a side sectional view of a plurality of shapedcharges 10 disposed within anannular gun tube 27, which is in turn inserted within anannular gun body 28. The shapedcharges 10 are oriented so theopenings 13 of thecases 12 are oriented in a direction generally radially outward from an axis of thegun tube 27. Further illustrated is thedetonation cord 26 extending between adjacent shapedcharges 10, so that by forming a detonation wave in one end of thedetonation cord 26, the detonation wave can be passed through each of the shapedcharges 10 to which the detonatingcord 24 is attached. The combination of the shapedcharges 10 andgun tube 27 inserted with the perforatinggun body 28 forms a perforating gun 29. In one example, acoupling 30 may be provided on an outer surface of a shaped charge 10 (FIG. 1 ) for maintaining the shapedcharge 10 withingun tube 27. - Referring now to
FIG. 3 , a stack of perforating guns 29 is shown coupled together to form a perforatingstring 31 which is inserted within a wellbore 32. Operation of detonation of the shapedcharges 10 within the perforating string 29 can be controlled within asurface truck 34 on surface. In this example, signals generated within thesurface truck 34 are sent via aline 36, from which the perforating string 29 is deployed within the wellbore 32. Example embodiments of theline 36 include wireline, slick line, coiled tubing, and cable. In the example ofFIG. 3 , theline 36 is extended through awellhead assembly 38 shown mounted at the mouth of the wellbore 32. By sending a signal from surface truck to wireline 36, detonating charges and detonating waves may be initiated in the perforating cord 24 (FIG. 2 ) for initiating detonation of explosive within the shapedcharges 10 and thatform metal jets 39 that project into a formation 40 adjacent wellbore 32. By initiating and forming themetal jets 39 and directing them into formation 40,perforations 42 are formed within formation 40 and for allowing fluid flow from formation 40 into wellbore 32. - The present invention described herein, therefore, is well adapted to carry out the objects and attain the ends and advantages mentioned, as well as others inherent therein. While a presently preferred embodiment of the invention has been given for purposes of disclosure, numerous changes exist in the details of procedures for accomplishing the desired results. These and other similar modifications will readily suggest themselves to those skilled in the art, and are intended to be encompassed within the spirit of the present invention disclosed herein and the scope of the appended claims.
Claims (17)
1. A shaped charge for use in perforating a wellbore comprising:
a case having an opening;
a liner inserted into a space in the case and having an open end and an apex;
explosive disposed between the liner and case;
a hole in the apex of the liner; and
a gap between an outer diameter of the open end of the liner and inner diameter of the opening in the case.
2. The shaped charge of claim 1 , wherein the hole has a diameter that ranges from about 10% to about 82% of an axial length of the liner.
3. The shaped charge of claim 1 , wherein an outer diameter of the open end of the liner ranges from about 60% to about 75% of an inner diameter of the opening of the case.
4. The shaped charge of claim 1 , wherein the hole ranges from about 7% of the liner outer diameter to about 60% of the liner outer diameter.
5. The shaped charge of claim 1 , wherein the shaped charge is selectively retained within a gun tube by a coupling that is provided with the case.
6. The shaped charge of claim 1 , wherein the shaped charge is selectively disposed in the wellbore within a perforating string.
7. The shaped charge of claim 1 , further comprising a slot on an end of the case opposite the opening that selectively receives a detonating cord, and an initiator in a passage formed through the case between the detonating cord and the explosive.
8. The shaped charge of claim 1 , further comprising a protective covering in the gap and over the explosive.
9. A shaped charge for use in perforating a wellbore comprising:
a case having an opening;
a liner in the case;
explosive between the liner and case; and
a gap defined by an outer diameter of the open end of the liner and inner diameter of the opening in the case, and having a liner diameter that ranges from about 60% to about 75% of the inner diameter of the opening in the case.
10. The shaped charge of claim 9 , further comprising a hole in an apex of the liner.
11. The shaped charge of claim 10 , wherein the hole has a diameter that ranges from about 29% to about 82% of a length of the liner.
12. The shaped charge of claim 9 , wherein the case is fitted with a coupling to selectively mount the shaped charge in a perforating string, and wherein the perforating string is disposed in the wellbore, and wherein detonating the explosive causes the liner to form a metal jet that penetrates into a formation adjacent the wellbore to form a perforation.
13. A method of perforating a wellbore comprising:
a. providing a shaped charge that comprises a case having an opening, a liner inserted in the opening that comprises an apex, a hole in the apex, and an open end with an outer diameter spaced radially inward from an inner diameter of the opening to define an annular gap, and explosive between the liner and the case;
b. installing the shaped charge in a perforating gun;
c. deploying the perforating gun in the wellbore; and
d. detonating the explosive so that a detonation wave is generated that collapses the liner to form a metal jet that penetrates into a wall of the wellbore and perforates the formation.
14. The method of claim 13 , wherein the outer diameter of the liner ranges from about 60% to about 75% of the inner diameter of the opening.
15. The method of claim 13 , wherein the hole ranges from about 15% of the liner outer diameter to about 44% of the liner outer diameter.
16. The method of claim 13 , wherein the perforating gun is part of a perforating string that is deployed on a line, and wherein a detonating signal is transmitted from surface through the line and to perforating gun.
17. The method of claim 13 , wherein the shaped charge is mounted into a gun tube that is inserted in the perforating gun.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/045,529 US20150096434A1 (en) | 2013-10-03 | 2013-10-03 | Sub-caliber shaped charge perforator |
PCT/US2014/057334 WO2015050765A1 (en) | 2013-10-03 | 2014-09-25 | Sub-caliber shaped charge perforator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/045,529 US20150096434A1 (en) | 2013-10-03 | 2013-10-03 | Sub-caliber shaped charge perforator |
Publications (1)
Publication Number | Publication Date |
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US20150096434A1 true US20150096434A1 (en) | 2015-04-09 |
Family
ID=52775894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/045,529 Abandoned US20150096434A1 (en) | 2013-10-03 | 2013-10-03 | Sub-caliber shaped charge perforator |
Country Status (2)
Country | Link |
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US (1) | US20150096434A1 (en) |
WO (1) | WO2015050765A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016168491A1 (en) * | 2015-04-14 | 2016-10-20 | Hunting Titan, Inc. | Detonating cord retaining device |
WO2020069113A3 (en) * | 2018-09-28 | 2020-07-02 | Baker Hughe, A Ge Company, Llc | Expendable hollow carrier fabrication system and method |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5862758A (en) * | 1993-01-15 | 1999-01-26 | Schlumberger Technology Corporation | Insert and twist method and apparatus for securing a shaped charge to a loading tube of a perforating gun |
US6021714A (en) * | 1998-02-02 | 2000-02-08 | Schlumberger Technology Corporation | Shaped charges having reduced slug creation |
US6305289B1 (en) * | 1998-09-30 | 2001-10-23 | Western Atlas International, Inc. | Shaped charge for large diameter perforations |
US20020017214A1 (en) * | 1998-09-14 | 2002-02-14 | Jerome J. Jacoby | Perforating devices for use in wells |
US6619176B2 (en) * | 2000-08-09 | 2003-09-16 | Halliburton Energy Services, Inc. | Thinned-skirt shaped-charge liner |
US7712416B2 (en) * | 2003-10-22 | 2010-05-11 | Owen Oil Tools Lp | Apparatus and method for penetrating oilbearing sandy formations, reducing skin damage and reducing hydrocarbon viscosity |
US7735578B2 (en) * | 2008-02-07 | 2010-06-15 | Baker Hughes Incorporated | Perforating system with shaped charge case having a modified boss |
US7779760B2 (en) * | 2005-02-23 | 2010-08-24 | Armaments Corporation Of South Africa Limited | Shaped charge assembly and method of damaging a target |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7493861B1 (en) * | 1989-07-24 | 2009-02-24 | The United States Of America As Represented By The Secretary Of The Army | Tandem shaped charge warhead having a confined forward charge and a light-weight blast shield |
US5847312A (en) * | 1997-06-20 | 1998-12-08 | The United States Of America As Represented By The Secretary Of The Army | Shaped charge devices with multiple confinements |
EP1286124A1 (en) * | 2001-08-20 | 2003-02-26 | Halliburton Energy Services, Inc. | Thinned-skirt shaped charge liner |
US20130061771A1 (en) * | 2011-09-13 | 2013-03-14 | Baker Hughes Incorporated | Active waveshaper for deep penetrating oil-field charges |
-
2013
- 2013-10-03 US US14/045,529 patent/US20150096434A1/en not_active Abandoned
-
2014
- 2014-09-25 WO PCT/US2014/057334 patent/WO2015050765A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5862758A (en) * | 1993-01-15 | 1999-01-26 | Schlumberger Technology Corporation | Insert and twist method and apparatus for securing a shaped charge to a loading tube of a perforating gun |
US6021714A (en) * | 1998-02-02 | 2000-02-08 | Schlumberger Technology Corporation | Shaped charges having reduced slug creation |
US20020017214A1 (en) * | 1998-09-14 | 2002-02-14 | Jerome J. Jacoby | Perforating devices for use in wells |
US6305289B1 (en) * | 1998-09-30 | 2001-10-23 | Western Atlas International, Inc. | Shaped charge for large diameter perforations |
US6619176B2 (en) * | 2000-08-09 | 2003-09-16 | Halliburton Energy Services, Inc. | Thinned-skirt shaped-charge liner |
US7712416B2 (en) * | 2003-10-22 | 2010-05-11 | Owen Oil Tools Lp | Apparatus and method for penetrating oilbearing sandy formations, reducing skin damage and reducing hydrocarbon viscosity |
US7779760B2 (en) * | 2005-02-23 | 2010-08-24 | Armaments Corporation Of South Africa Limited | Shaped charge assembly and method of damaging a target |
US7735578B2 (en) * | 2008-02-07 | 2010-06-15 | Baker Hughes Incorporated | Perforating system with shaped charge case having a modified boss |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016168491A1 (en) * | 2015-04-14 | 2016-10-20 | Hunting Titan, Inc. | Detonating cord retaining device |
EP3401499A1 (en) * | 2015-04-14 | 2018-11-14 | Hunting Titan Inc. | Detonating cord retaining device |
EP3404199A1 (en) * | 2015-04-14 | 2018-11-21 | Hunting Titan Inc. | Detonating cord retaining device |
EP3283726A4 (en) * | 2015-04-14 | 2018-12-26 | Hunting Titan Inc. | Detonating cord retaining device |
WO2020069113A3 (en) * | 2018-09-28 | 2020-07-02 | Baker Hughe, A Ge Company, Llc | Expendable hollow carrier fabrication system and method |
GB2592787A (en) * | 2018-09-28 | 2021-09-08 | Baker Hughes Holdings Llc | Expendable hollow carrier fabrication system and method |
US11267031B2 (en) | 2018-09-28 | 2022-03-08 | Baker Hughes, A Ge Company, Llc | Expendable hollow carrier fabrication system and method |
GB2592787B (en) * | 2018-09-28 | 2023-01-25 | Baker Hughes Holdings Llc | Expendable hollow carrier fabrication system and method |
Also Published As
Publication number | Publication date |
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WO2015050765A1 (en) | 2015-04-09 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: BAKER HUGHES INCORPORATED, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WHITE, RYAN S.;HARVEY, WILLIAM B.;BETANCOURT, DAVID;AND OTHERS;REEL/FRAME:031839/0526 Effective date: 20131004 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |