US2201290A - Method and means for perforating well casings - Google Patents

Method and means for perforating well casings Download PDF

Info

Publication number
US2201290A
US2201290A US259828A US25982839A US2201290A US 2201290 A US2201290 A US 2201290A US 259828 A US259828 A US 259828A US 25982839 A US25982839 A US 25982839A US 2201290 A US2201290 A US 2201290A
Authority
US
United States
Prior art keywords
casing
well
explosive
chambers
explosive charges
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.)
Expired - Lifetime
Application number
US259828A
Inventor
Haskell M Greene
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US259828A priority Critical patent/US2201290A/en
Application granted granted Critical
Publication of US2201290A publication Critical patent/US2201290A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/116—Gun or shaped-charge perforators

Definitions

  • This invention relates to a method of and means for perforating a well casing in position in a well hole.
  • the present method of perforating a well casing in position in a well hole by means of the conventional gun perforator has several objectional features. For example, burrs are left on the inside of the casing around the perforations by the conventional gun perforator, which burrs damage a swab or similar tool, unless they are removed by means of a rasp or other tool. Sometimes the casing is split or otherwise damaged by the bullet fired from the gun perforator.
  • An object of my invention is to provide a method of perforating a well casing in which the edges of the perforations on the inside of the casing will be smooth.
  • Another object of my invention is to provide a casing having explosive charges attached thereto.
  • Another object of my invention is to provide a casing having a plurality of chambers containing explosive charges.
  • Another object of my invention is to provide a method of perforating a well casing in place in a well hole which consists in providing chambers in the wall of said casing, placing explosive charges in said chambers, providing closure means for said chambers, lowering said easing into position in the well hole, and selectively firing as many of said explosive charges as desired, thereby perforating said casing and shattering the material adjacent to said casing.
  • Figure 1 is a side elevation, partly broken away, of a section of casing in a well hole with the means for exploding the explosive charges in place.
  • Figure 2 is an enlarged longitudinal section of the casing and adjacent structure, after several of the explosive charges have been exploded.
  • Figure 3 is an enlarged transverse section of a part of the casing showing one of the chambers.
  • Figure 4 is the same as Figure 3, after the explosive charge in the chamber has been exploded.
  • Figure 5 is an enlarged transverse section of a part of the casing showing another form of chamber.
  • Figure 6 is the same as Figure 5, after the explosive charge has been exploded.
  • FIG 1 illustrates a well casing I0 provided with a plurality of chambers containing explosive charges.
  • holes H are made in the casing.
  • Plugs 12 are thenforced into the holes II.
  • the plugs l2 are preferably made of a good grade of hard steel and welded in place as indicated by the numeral; l3, ,so,.;that the casing Ill instead of being weakened at'the point where the perforation is made;- is in fact strengthened.
  • the inner wall of the plug may be comparatively thin, and the outer-portion of i the plug may be threaded as indicated by the numerals I 4 and I5 respectively.
  • the plugs I2 are provided with openings l6 which are of the same diameter as the desired perforations, and which form chambers into which explosive charges are placed.
  • the explosive charge may be a gelatinized nitro cellulose, of the type commonly used as a base for rifle and pistol powders.
  • the chambers are then closed, for example, by means of threaded (caps H, the outer walls I8 of which are preferably somewhat smaller in thickness than the inner walls M of the plugs.
  • the casing I0 is provided with as many rows of explosive charges as desired which are spaced apart as desired, and with either two, four, six or any other desired number of explosive charges in each row.
  • the casing is run into position in the well hole, and may or may not be cemented in the formation, depending upon whether or not it is necessary to shut off formations containing water.
  • any convenient means may be used to selectively fire as many of said explosive charges as desired, for example, electrical heating elements, or low grade explosives.
  • electrical heating elements or low grade explosives.
  • chemical heating means somewhat similar to that described in U. S. Patent No, 2,144,208, issued Jan. 17, 1939, may be conveniently used.
  • is lowered in the well hole by means well hole.
  • the container 20 is preferably made of such length that only one row of explosive charges will be fired at a time, although the containermay be made of such length that 2 or more rows of explosive charges. will be fired every time that current is passed through the heating element.
  • the container 20 is then raised or lowered to the position where it is desired to make another row of perforations, and the current is again passed through the heating element 2
  • a container provided with a battery, timeswitch, and heating element may be used to fire the explosive charges.
  • the time switch is set to operate a short time in advance in order to allow for the time necessary to lower the container into the desired position in the As the time switch operates, current from the battery causes the heating element to generate suflicient heat to explode the charges I in the explosive chambers adjacent thereto.
  • the easing is provided with enlarged portions 40 and threaded openings 4! are made in said enlarged portions, which openings do not extend through to the interior of, the casing.
  • Threaded plugs 42 provided with chambers 43 which are of the same diameter as that of the desired perforations are threaded into the threaded openings ll after the chambers 43 are filled with explosive charges.
  • The'portion of plug indicated by the numeral 44 adjacent the head portion 46 may be recessed in order to make certain of the position where the plug will fracture when the charge is exploded.
  • the head portion 4! acts as a bullet in shattering the surrounding formation.
  • a well-casing having an explosive charge attached thereto which charge is adapted to be fired while attached to said well-casing.
  • a well-casing provided with a plurality of chambers containing explosive material.
  • a well-casing having an explosive charge in the walls of said well-casing, said explosive charge being adapted to be tired after said wellcasing is in position in a well-hole.
  • a well-casing provided with a. plurality of chambers containing explosive material, said explosive material being adapted to be fired after the well -casing is in position in a well-hole.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Catching Or Destruction (AREA)

Description

y 21, 1940- H. M. GREENE 2,201,290
METHOD AND MEANS FOR PERFORATING WELL CASINGS' Filed March 4, 1939 2 Sheets-Sheet 1 /z r 76 l7 l3 I 20 g z/ l g 7 A TTORNEY 11v VENTOR.
y 1940. I H. M. GREENE 2,201,290
By W ATTORNEY Patented May 21, 1940- UNITED STATES METHOD AND MEANS FOR PERFORATING WELL CASINGS Haskell M. Greene, Whittier, Calif. Application March 4, 1939, Serial No. 259,828
. 5 Claims.
This invention relates to a method of and means for perforating a well casing in position in a well hole.
The present method of perforating a well casing in position in a well hole by means of the conventional gun perforator has several objectional features. For example, burrs are left on the inside of the casing around the perforations by the conventional gun perforator, which burrs damage a swab or similar tool, unless they are removed by means of a rasp or other tool. Sometimes the casing is split or otherwise damaged by the bullet fired from the gun perforator.
An object of my invention is to provide a method of perforating a well casing in which the edges of the perforations on the inside of the casing will be smooth.
Another object of my invention is to provide a casing having explosive charges attached thereto.
Another object of my invention is to provide a casing having a plurality of chambers containing explosive charges.
Another object of my invention is to provide a method of perforating a well casing in place in a well hole which consists in providing chambers in the wall of said casing, placing explosive charges in said chambers, providing closure means for said chambers, lowering said easing into position in the well hole, and selectively firing as many of said explosive charges as desired, thereby perforating said casing and shattering the material adjacent to said casing.
My invention has many other objects, advantages, and features, some of which, with the foregoing, will be set forth at length in the following description where I shall outline certain forms of the invention, which I have selected for illustration in the drawings accompanying and forming a part of the present specification. In
the said drawings, I have shown certain forms of my invention, but it is to be understood that I do not limit myself to such forms, since the invention, as expressed in the claims, may be embodied in a large plurality of forms.
Figure 1 is a side elevation, partly broken away, of a section of casing in a well hole with the means for exploding the explosive charges in place.
Figure 2 is an enlarged longitudinal section of the casing and adjacent structure, after several of the explosive charges have been exploded.
Figure 3 is an enlarged transverse section of a part of the casing showing one of the chambers.
Figure 4 is the same as Figure 3, after the explosive charge in the chamber has been exploded.
Figure 5 is an enlarged transverse section of a part of the casing showing another form of chamber.
Figure 6 is the same as Figure 5, after the explosive charge has been exploded.
Figure 1 illustrates a well casing I0 provided with a plurality of chambers containing explosive charges. As shown in Figure 3, holes H are made in the casing. Plugs 12 are thenforced into the holes II. The plugs l2 are preferably made of a good grade of hard steel and welded in place as indicated by the numeral; l3, ,so,.;that the casing Ill instead of being weakened at'the point where the perforation is made;- is in fact strengthened. The inner wall of the plugmay be comparatively thin, and the outer-portion of i the plug may be threaded as indicated by the numerals I 4 and I5 respectively.
The plugs I2 are provided with openings l6 which are of the same diameter as the desired perforations, and which form chambers into which explosive charges are placed. The explosive charge may be a gelatinized nitro cellulose, of the type commonly used as a base for rifle and pistol powders. The chambers are then closed, for example, by means of threaded (caps H, the outer walls I8 of which are preferably somewhat smaller in thickness than the inner walls M of the plugs.
The casing I0 is provided with as many rows of explosive charges as desired which are spaced apart as desired, and with either two, four, six or any other desired number of explosive charges in each row.
The casing is run into position in the well hole, and may or may not be cemented in the formation, depending upon whether or not it is necessary to shut off formations containing water.
Any convenient means may be used to selectively fire as many of said explosive charges as desired, for example, electrical heating elements, or low grade explosives. In the drawings I have illustrated an electrical heating means to fire the explosivecharges, although chemical heating means somewhat similar to that described in U. S. Patent No, 2,144,208, issued Jan. 17, 1939, may be conveniently used.
A container 20 having an electrical heating element 2| is lowered in the well hole by means well hole.
explosive charge in the casing. After the container 20 has been lowered to the position where the perforations are desired, current is passed through the heating element 2| by means of the insulated electric cables 22 and 23, which causes the heating element to give of! sumcient heat to explode the explosive charge in the chambers adjacent thereto, thereby forcing the wall it in and the cap I! out. The cap l1 acts as a bullet in shattering the formation as shown in Figure 2. As shown in Figure 4 the walls of the perforations on the inside of the casing iii are smooth.
Due to the fact that the wall l8 of the cap i'l is somewhat smaller in thickness than the wall it of the plug it, most of the charge is exploded outside of the walls of the casing. The container 20 is preferably made of such length that only one row of explosive charges will be fired at a time, although the containermay be made of such length that 2 or more rows of explosive charges. will be fired every time that current is passed through the heating element.
The container 20 is then raised or lowered to the position where it is desired to make another row of perforations, and the current is again passed through the heating element 2| in order to explode the explosive charges adjacent thereto. The above operations are repeated until the casing is perforated as desired.
Instead of using the above means to fire the explosive charges, a container provided with a battery, timeswitch, and heating element may be used to fire the explosive charges. By means of such a container, it is not necessary to use a special insulated electric cable, and the conventional sand line or drilling cable can be used to lower the container into position. The time switch is set to operate a short time in advance in order to allow for the time necessary to lower the container into the desired position in the As the time switch operates, current from the battery causes the heating element to generate suflicient heat to explode the charges I in the explosive chambers adjacent thereto. A
similar means can readily be used to ignite Thermit' when that compound is used to create heat in order to explode the charges. I
In the modification shown in Figure 5, the easing is provided with enlarged portions 40 and threaded openings 4! are made in said enlarged portions, which openings do not extend through to the interior of, the casing. Threaded plugs 42 provided with chambers 43 which are of the same diameter as that of the desired perforations are threaded into the threaded openings ll after the chambers 43 are filled with explosive charges.
The'portion of plug indicated by the numeral 44 adjacent the head portion 46 may be recessed in order to make certain of the position where the plug will fracture when the charge is exploded. In exploding a charge in a plug of this type, the head portion 4! acts as a bullet in shattering the surrounding formation.
From the foregoing description taken in con nection with the accomanying drawings, the uses, advantages, and operation of my invention will be readily understood by those skilled in the art to which the invention appertains. I While I have described the principle of operation together with the forms of my invention which I now consider to be the best embodiment thereof, I desire to have it understood that the articles shown are merely illustrative and that the invention is not to be limited to the detailsdisclosed herein, but is to be accorded the full scope of the appended claims.
I claim:
1. A well-casing having an explosive charge attached thereto which charge is adapted to be fired while attached to said well-casing.
2. A well-casing having an explosive charge in the walls of said well-casing. I V
3. A well-casing provided with a plurality of chambers containing explosive material.
4. A well-casing having an explosive charge in the walls of said well-casing, said explosive charge being adapted to be tired after said wellcasing is in position in a well-hole.
5. A well-casing provided with a. plurality of chambers containing explosive material, said explosive material being adapted to be fired after the well -casing is in position in a well-hole.
\ M. GREENE.
US259828A 1939-03-04 1939-03-04 Method and means for perforating well casings Expired - Lifetime US2201290A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US259828A US2201290A (en) 1939-03-04 1939-03-04 Method and means for perforating well casings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US259828A US2201290A (en) 1939-03-04 1939-03-04 Method and means for perforating well casings

Publications (1)

Publication Number Publication Date
US2201290A true US2201290A (en) 1940-05-21

Family

ID=22986566

Family Applications (1)

Application Number Title Priority Date Filing Date
US259828A Expired - Lifetime US2201290A (en) 1939-03-04 1939-03-04 Method and means for perforating well casings

Country Status (1)

Country Link
US (1) US2201290A (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500754A (en) * 1945-07-23 1950-03-14 Standard Oil Dev Co Screen assembly for wells
US2530844A (en) * 1946-09-09 1950-11-21 Mccullough Tool Company Gun perforator
US2535964A (en) * 1945-07-30 1950-12-26 John J Fleet Means for casing cutting
US2593866A (en) * 1947-11-04 1952-04-22 Phillips Petroleum Co Well casing gun
US2629445A (en) * 1946-11-23 1953-02-24 Kinley John C Pipe severing method and apparatus
US2707997A (en) * 1952-04-30 1955-05-10 Zandmer Methods and apparatus for sealing a bore hole casing
US2779278A (en) * 1947-02-19 1957-01-29 Borg Warner Apparatus for perforating well casings
US2855049A (en) * 1954-11-12 1958-10-07 Zandmer Solis Myron Duct-forming devices
US3003556A (en) * 1958-10-23 1961-10-10 Jersey Prod Res Co Method of perforating one of a plurality of parallel pipe strings
US3468386A (en) * 1967-09-05 1969-09-23 Harold E Johnson Formation perforator
US4286662A (en) * 1979-11-05 1981-09-01 Page John S Jr Tubing drain
US4498543A (en) * 1983-04-25 1985-02-12 Union Oil Company Of California Method for placing a liner in a pressurized well
US4673039A (en) * 1986-01-24 1987-06-16 Mohaupt Henry H Well completion technique
US6095247A (en) * 1997-11-21 2000-08-01 Halliburton Energy Services, Inc. Apparatus and method for opening perforations in a well casing
US6591915B2 (en) * 1998-05-14 2003-07-15 Fike Corporation Method for selective draining of liquid from an oil well pipe string
US20090032255A1 (en) * 2007-08-03 2009-02-05 Halliburton Energy Services, Inc. Method and apparatus for isolating a jet forming aperture in a well bore servicing tool
US20100122817A1 (en) * 2008-11-19 2010-05-20 Halliburton Energy Services, Inc. Apparatus and method for servicing a wellbore
US20110036590A1 (en) * 2009-08-11 2011-02-17 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US20110073313A1 (en) * 2008-03-14 2011-03-31 Statoil Asa Device for fixing a valve to a tubular member
US20110108272A1 (en) * 2009-11-12 2011-05-12 Halliburton Energy Services, Inc. Downhole progressive pressurization actuated tool and method of using the same
US8662178B2 (en) 2011-09-29 2014-03-04 Halliburton Energy Services, Inc. Responsively activated wellbore stimulation assemblies and methods of using the same
US8668012B2 (en) 2011-02-10 2014-03-11 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US8668016B2 (en) 2009-08-11 2014-03-11 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US8695710B2 (en) 2011-02-10 2014-04-15 Halliburton Energy Services, Inc. Method for individually servicing a plurality of zones of a subterranean formation
US8893811B2 (en) 2011-06-08 2014-11-25 Halliburton Energy Services, Inc. Responsively activated wellbore stimulation assemblies and methods of using the same
US8899334B2 (en) 2011-08-23 2014-12-02 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US8991509B2 (en) 2012-04-30 2015-03-31 Halliburton Energy Services, Inc. Delayed activation activatable stimulation assembly
US9689247B2 (en) 2014-03-26 2017-06-27 Superior Energy Services, Llc Location and stimulation methods and apparatuses utilizing downhole tools
US9784070B2 (en) 2012-06-29 2017-10-10 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US9896920B2 (en) 2014-03-26 2018-02-20 Superior Energy Services, Llc Stimulation methods and apparatuses utilizing downhole tools

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500754A (en) * 1945-07-23 1950-03-14 Standard Oil Dev Co Screen assembly for wells
US2535964A (en) * 1945-07-30 1950-12-26 John J Fleet Means for casing cutting
US2530844A (en) * 1946-09-09 1950-11-21 Mccullough Tool Company Gun perforator
US2629445A (en) * 1946-11-23 1953-02-24 Kinley John C Pipe severing method and apparatus
US2779278A (en) * 1947-02-19 1957-01-29 Borg Warner Apparatus for perforating well casings
US2593866A (en) * 1947-11-04 1952-04-22 Phillips Petroleum Co Well casing gun
US2707997A (en) * 1952-04-30 1955-05-10 Zandmer Methods and apparatus for sealing a bore hole casing
US2855049A (en) * 1954-11-12 1958-10-07 Zandmer Solis Myron Duct-forming devices
US3003556A (en) * 1958-10-23 1961-10-10 Jersey Prod Res Co Method of perforating one of a plurality of parallel pipe strings
US3468386A (en) * 1967-09-05 1969-09-23 Harold E Johnson Formation perforator
US4286662A (en) * 1979-11-05 1981-09-01 Page John S Jr Tubing drain
US4498543A (en) * 1983-04-25 1985-02-12 Union Oil Company Of California Method for placing a liner in a pressurized well
US4673039A (en) * 1986-01-24 1987-06-16 Mohaupt Henry H Well completion technique
US6095247A (en) * 1997-11-21 2000-08-01 Halliburton Energy Services, Inc. Apparatus and method for opening perforations in a well casing
US6591915B2 (en) * 1998-05-14 2003-07-15 Fike Corporation Method for selective draining of liquid from an oil well pipe string
US20030192701A1 (en) * 1998-05-14 2003-10-16 Burris Mark A. Dump valve assembly for selective draining of liquid from an oil well pipe stream
US6752212B2 (en) * 1998-05-14 2004-06-22 Fike Corporation Dump valve assembly for selective draining of liquid from an oil well pipe stream
US20040216867A1 (en) * 1998-05-14 2004-11-04 Burris Mark A. Dump hole dump valve
US20090032255A1 (en) * 2007-08-03 2009-02-05 Halliburton Energy Services, Inc. Method and apparatus for isolating a jet forming aperture in a well bore servicing tool
US7673673B2 (en) * 2007-08-03 2010-03-09 Halliburton Energy Services, Inc. Apparatus for isolating a jet forming aperture in a well bore servicing tool
US20100126724A1 (en) * 2007-08-03 2010-05-27 Halliburton Energy Services, Inc. Method and apparatus for isolating a jet forming aperture in a well bore servicing tool
US7963331B2 (en) 2007-08-03 2011-06-21 Halliburton Energy Services Inc. Method and apparatus for isolating a jet forming aperture in a well bore servicing tool
US20110073313A1 (en) * 2008-03-14 2011-03-31 Statoil Asa Device for fixing a valve to a tubular member
US20100122817A1 (en) * 2008-11-19 2010-05-20 Halliburton Energy Services, Inc. Apparatus and method for servicing a wellbore
US7775285B2 (en) 2008-11-19 2010-08-17 Halliburton Energy Services, Inc. Apparatus and method for servicing a wellbore
US8668016B2 (en) 2009-08-11 2014-03-11 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US8276675B2 (en) 2009-08-11 2012-10-02 Halliburton Energy Services Inc. System and method for servicing a wellbore
US20110036590A1 (en) * 2009-08-11 2011-02-17 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US20110108272A1 (en) * 2009-11-12 2011-05-12 Halliburton Energy Services, Inc. Downhole progressive pressurization actuated tool and method of using the same
US8272443B2 (en) 2009-11-12 2012-09-25 Halliburton Energy Services Inc. Downhole progressive pressurization actuated tool and method of using the same
US8695710B2 (en) 2011-02-10 2014-04-15 Halliburton Energy Services, Inc. Method for individually servicing a plurality of zones of a subterranean formation
US8668012B2 (en) 2011-02-10 2014-03-11 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US9428976B2 (en) 2011-02-10 2016-08-30 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US9458697B2 (en) 2011-02-10 2016-10-04 Halliburton Energy Services, Inc. Method for individually servicing a plurality of zones of a subterranean formation
US8893811B2 (en) 2011-06-08 2014-11-25 Halliburton Energy Services, Inc. Responsively activated wellbore stimulation assemblies and methods of using the same
US8899334B2 (en) 2011-08-23 2014-12-02 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US8662178B2 (en) 2011-09-29 2014-03-04 Halliburton Energy Services, Inc. Responsively activated wellbore stimulation assemblies and methods of using the same
US8991509B2 (en) 2012-04-30 2015-03-31 Halliburton Energy Services, Inc. Delayed activation activatable stimulation assembly
US9784070B2 (en) 2012-06-29 2017-10-10 Halliburton Energy Services, Inc. System and method for servicing a wellbore
US9689247B2 (en) 2014-03-26 2017-06-27 Superior Energy Services, Llc Location and stimulation methods and apparatuses utilizing downhole tools
US9896920B2 (en) 2014-03-26 2018-02-20 Superior Energy Services, Llc Stimulation methods and apparatuses utilizing downhole tools

Similar Documents

Publication Publication Date Title
US2201290A (en) Method and means for perforating well casings
US2980017A (en) Perforating devices
US5775426A (en) Apparatus and method for perforating and stimulating a subterranean formation
US6158511A (en) Apparatus and method for perforating and stimulating a subterranean formation
US4329925A (en) Fracturing apparatus
US3235005A (en) Shaped explosive charge devices
US3621916A (en) Spark-type casing perforator
US2402153A (en) Gun perforator
US3721297A (en) Method for cleaning wells
US2669928A (en) Perforating device for wells
US10597987B2 (en) System and method for perforating a formation
US2927534A (en) Perforating device and method of perforating wells
US1582184A (en) Method and means for perforating well casings
US2408419A (en) Well explosive device
US2336819A (en) Method and apparatus for perforating well casing by gunfire
US2689008A (en) Method for cementing wells
US3190219A (en) Perforating device
US2928658A (en) Sidewall sampler
US3874461A (en) Perforating apparatus
US2699721A (en) Explosive cutting device
US3311178A (en) Apparatus for performing well operations
US2696169A (en) Shaped charge well-pipe perforator
US2530833A (en) Gun perforator
US2334931A (en) Gun perforator and firing device therefor
US3346056A (en) Hollow carrier gun