US2761385A - Devices for controlling the firing of charges of powder or explosives from a distance - Google Patents

Devices for controlling the firing of charges of powder or explosives from a distance Download PDF

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Publication number
US2761385A
US2761385A US252892A US25289251A US2761385A US 2761385 A US2761385 A US 2761385A US 252892 A US252892 A US 252892A US 25289251 A US25289251 A US 25289251A US 2761385 A US2761385 A US 2761385A
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Prior art keywords
firing
igniter
charges
powder
distance
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Expired - Lifetime
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US252892A
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English (en)
Inventor
Marcel Schlumberger
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Services Petroliers Schlumberger SA
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Societe de Prospection Electrique Schlumberger SA
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/116—Gun or shaped-charge perforators
    • E21B43/1185—Ignition systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • F42D1/045—Arrangements for electric ignition
    • F42D1/05—Electric circuits for blasting

Definitions

  • the present invention relates to devices which permit the selective firing from a distance of a plurality of charges of powder or explosive disposed at a remote'location asin a borehole drilled intojthe earth, for example. Morespecifically, ithas to dowith selectivefiring devices of the ,kind in which the firing of a primer causes the iipriming of a following charge by mechanical or other means, and it refers more particularly to devices of the type in which the firing is accomplishedelectrically.
  • gIn-certain .deyices such as sample takers forlu's'e in wells, ,tor example, a large number of sample taking tools ,are required to be ejected successively," and .it is desired to know at each moment precisely which ex'i- Plosive tool ,is firedso as .to insure that the shots will .be made at ,the exact well depth desired; Usually,.the' tools are connected to the. firing apparatus in the .well .by
  • Theprincipal object of .the present invention is to provide new and improved selective firing "devices which definitely make it impossible for aplurality' of charges of powder orexplosiveto be fired simultaneously.
  • the elec? tric primers of theunpr imed'c'harg'e's" aragr unaes ai their two ends so as to prevent "anypossibility destin d: leaks causing the premature firing of a charge.
  • "liifadlditionfthe charges are preferably distributed 'in thfee' or mo'recircuifs so that, for instance, the c'a'se 'df th'ree iiendingecl Sept 1956 circuits, there are always two primed charge s belonging angs a turn 'causes or assures the priming of at least two other charges, and so forth.
  • l is "aschematic diagram of athree-circuitqelect fir g d i caas ru ed ord n to the inv and intended, for instance, for firing chargesin a multipleshot device lowered in a borehole;
  • FIGS. 2 and 3 illustrate schematicallythe state of the havebeen fired
  • ,firing device of Fig. 1 after the first and second shots Fig. 4 is aview in side elevation of part shot device provided with a firing device according to theinventionj and Fig. 5 is a view in longitudinal section taken alongline 5 5 of Fig. 4.
  • the firing device comprises priming mechanism mounted separately in three electric circuits, the discharge of each igniter in one ofthe circuits assuring the priming of the two following igniters arrangedQ-r spectively,in the other circuits. ln' Fig.
  • theigniters are shown diagrammatically by small-electric resistors R1-1, R21,- Rs1, R1-2,,R2-2, Ra-z, R1-3, Rz-s and R34 formed by filaments which cause the firingbyfthe fact that they are brought to incandescence by .the passage of the current.
  • resistors Although only nine resistors areshown in Fig. 1, obviously a greater or lesser number may be used and, in practice, the successive and'selective' firing of thirty charges or more may be readily provided for according to the invention.
  • Resistors'R23 andR'ss are not shown in Figs. 2 and 3, since they are not immediately affected by the exemplary operation described hereinafter.
  • the igniters are distributed in three groups which are adapted to be energized by three different electric circuits, the igniters of the first group being denoted by the designation R1, those of the second group by R2, and those of the third group. by R v
  • the three groups of igniters are fed separately by means of three electric conductors, ll, 12, andi13, running from the apparatus in the borehole to the surface of the earth wherethey are connected to the fixed contacts. 14, 15 and to'each ofthe groups are adaptedtoibe connected between the corresponding conductor, on the one hand, and
  • Two of the igniters i. e. the two lower igniters Rl-l and R24, are connected, before the apparatus is lowered into the borehole, directly between the conductors 11 and 12 and the ground 21 so that they are primed before the start of the operations.
  • the other igniters are not initially primed but their two ends are both connected to ground, as shown.
  • Priming which may, for instance, be effected in the manner described hereafter concerning more specifically the m-ulti-shot apparatus proper, or in any other manner, will consist in disconnecting one of the terminals of an unprimed igniter from ground and connecting it to the corresponding conductor 11, 12 or 13.
  • the apparatus After the apparatus has been prepared, as outlined above, it will function in the following manner: the first charge is fired by supplying electric current to the conductor 11 thereby energizing the first primed igniter R1-1. The firing of the shot corresponding to the igniter R1-1, primes the igniter R3 1, so that the firing circuit is then in the condition shown in Fig. 2, i. e., the two igniters R2-1 and R3-1 alone being primed. Thereupon current is passed into the conductor 12 and the firing of the shot corresponding to the igniter RZ-l primes the igniter R1-z, so that the firing circuit is then in the state shown in Fig. 3. In this state, the igniter Rs-i can be ignited by causing a current to be passed into the conductor 13 and the firing of the shot corresponding thereto will prime the igniter Rz-z and so forth.
  • Figs. 4 and 5 show part of a sample taking device for use in wells which is equipped with mechanism constructed according to the invention.
  • the sample taker is similar to those used at the present time in that it consists of an elongated cylindrical body in which there have been provided transversely extending recesses forming gun barrels (there may be as many as thirty gun barrels formed along the body, or even more).
  • a sample taker having three guns is shown for purposes of illustration.
  • projectiles such as sample taking tools which may be formed by tubes which are adapted to be projected into the ground by the explosion of a charge of powder.
  • Each of the sample taking tools is connected to the body of the apparatus by a flexible cable so that it can be pulled up with the body of the apparatus. Apparatus of this general character is shown in prior Patent No. 2,055,506 to Marcel Schlumberger.
  • the body of the apparatus 22 has formed therein a plurality of recesses 24-1, 24-2, 24-3 which form powder chambers.
  • a plurality of sample taking tools 29-1, 29-2, 29-3 which are connected to the body of the apparatus by the cables 30-1, 30-2, 30-3, respectively.
  • the powder in the powder chambers 241, 24-2, 24-3, is adapted tobe ignited by a plurality of igniting means which are connected, respectively, to the three conductors 11, 12 and 13 (in Fig. 5 only the conductor 13 is seen).
  • the igniting devices are preferably of the type disclosed in the copending application Serial No. 128,323, filed November 19, 1949, by Marcel Schlumberger, for Electrical Igniters, now Patent No. 2,681,701, issued June 22, 1954.
  • the wire 28-3 which is associated with the sample taker tool 29-3 which is adapted to be ejected by the combustion of the charge in the chamber 24-3 passes (Fig. 4) through the cable 30-2which connects the tool 29-2 to the apparatus and is attached to the cable 30-1 which connects the tool 29-1 to the apparatus.
  • the igniter R3-1 is shown in the unprimed condition, while the igniter R2-1 is primed.
  • the primed position the short-circuiting wire is missing, and the blade 26-2, because of the elasticity of the element 27-2, will make contact with the contact 31-2.
  • the igniter R2 1 is connected between ground and the corresponding conductor 12.
  • the sample taking tool 29-1 is projected into the adjacent earth formation (not shown) and carries with it the cable 30-1 and the wire 28-3 attached to the latter. When the wire 28-3 is pulled out, the blade 26-3 will engage the contact 31-3 thereby priming the igniter R3-1.
  • the igniter R1-1 misfires and that, therefore, the sample taking tool 29-1 has remained in place, the firing can, nevertheless, be continued. Since the igniter Rz-1 is primed, by causing current to pass into this igniter from the conductor 12, the tool 29-2 can be ejected, and the cable 30-2, through which the wire 28-3 passes, will pull out the latter wire so that the igniter Ra-r will be primed. At the same time, since the cable 30-2 is also connected to the end of a wire 28-4 associated with the immediately following igniter R1-z (Fig. 1), ejection of the sample taker tool 29-2 will prime the following igniter R1-z so that, in all cases, after firing this shot, there will still be two primed igniters.
  • the invention provides novel and highly effective firing mechanism for setting oif a plurality of explosive charges from a distance.
  • a single energizing conductor for each of a plurality of groups of charges and maintaining the majority of the igniters normally short circuited, possible simultaneous firing of all of the charges is avoided.
  • the firing of any one charge to prime at least one charge in each of at least two. other groups of charges, it is possible to continue with the firing operations even if a misfire takes place.
  • sample taking apparatus including a body adapted to be lowered into a well and having a plurality of laterally directed, longitudinally spaced apart gun barrels formed therein, a sample taking projectile in each of said gun barrels, and powder chamber means for each of said gun barrels each having electrical igniter means therefor, the combination of a plurality of means for short-circuiting all but at least two of said igniter means, a first firing circuit including one of said two igniter means, a second firing circuit including the other of said two igniter means, a third firing circuit, means actuated by ejection of the projectile corresponding to one of said two igniter means for rendering one of said short-circuiting means for a third igniter means ineffective and connecting said third igniter means in said third firing circuit, means connected to each projectile other than said projectile corresponding to said one of said two igniter means for rendering ineffective said shortcircuiting means for the igniter means in two adjacent powder chambers and for connecting them in two diflferent ones of said three firing circuits,

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Air Bags (AREA)
  • Sampling And Sample Adjustment (AREA)
US252892A 1951-01-30 1951-10-24 Devices for controlling the firing of charges of powder or explosives from a distance Expired - Lifetime US2761385A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1044580T 1951-01-30

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US2761385A true US2761385A (en) 1956-09-04

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US (1) US2761385A (ref)
DE (1) DE920233C (ref)
FR (1) FR1044580A (ref)
GB (1) GB705002A (ref)
NL (1) NL80264C (ref)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026774A (en) * 1958-02-20 1962-03-27 Brevets Aero Mecaniques Firing devices for rockets carried in clusters by a launching machine, and in particular an aircraft
US3202227A (en) * 1960-05-12 1965-08-24 Schlumberger Prospection Switch control systems
US3227228A (en) * 1963-05-24 1966-01-04 Clyde E Bannister Rotary drilling and borehole coring apparatus and method
US4051907A (en) * 1976-03-10 1977-10-04 N L Industries, Inc. Selective firing system
US4100978A (en) * 1974-12-23 1978-07-18 Boop Gene T Technique for disarming and arming electrically fireable explosive well tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052185A (en) * 1954-07-02 1962-09-04 Apstein Maurice Electric switch

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738595A (en) * 1927-05-17 1929-12-10 Hercules Powder Co Ltd Method for firing explosives
US2307729A (en) * 1939-03-17 1943-01-05 Foster James Lewis Well explosive
US2331058A (en) * 1942-08-14 1943-10-05 Lane Wells Co Firing apparatus for gun perforators
US2343087A (en) * 1940-01-23 1944-02-29 Schlumberger Marcel Switching mechanism for borehole apparatus
US2511408A (en) * 1944-06-09 1950-06-13 Schlumberger Well Surv Corp Side wall sample taker
US2543823A (en) * 1948-03-26 1951-03-06 Standard Oil Dev Co Casing perforating gun
US2546686A (en) * 1947-03-21 1951-03-27 Du Pont Blasting device
US2569511A (en) * 1948-12-22 1951-10-02 Du Pont Blasting device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738595A (en) * 1927-05-17 1929-12-10 Hercules Powder Co Ltd Method for firing explosives
US2307729A (en) * 1939-03-17 1943-01-05 Foster James Lewis Well explosive
US2343087A (en) * 1940-01-23 1944-02-29 Schlumberger Marcel Switching mechanism for borehole apparatus
US2331058A (en) * 1942-08-14 1943-10-05 Lane Wells Co Firing apparatus for gun perforators
US2511408A (en) * 1944-06-09 1950-06-13 Schlumberger Well Surv Corp Side wall sample taker
US2546686A (en) * 1947-03-21 1951-03-27 Du Pont Blasting device
US2543823A (en) * 1948-03-26 1951-03-06 Standard Oil Dev Co Casing perforating gun
US2569511A (en) * 1948-12-22 1951-10-02 Du Pont Blasting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026774A (en) * 1958-02-20 1962-03-27 Brevets Aero Mecaniques Firing devices for rockets carried in clusters by a launching machine, and in particular an aircraft
US3202227A (en) * 1960-05-12 1965-08-24 Schlumberger Prospection Switch control systems
US3227228A (en) * 1963-05-24 1966-01-04 Clyde E Bannister Rotary drilling and borehole coring apparatus and method
US4100978A (en) * 1974-12-23 1978-07-18 Boop Gene T Technique for disarming and arming electrically fireable explosive well tool
US4051907A (en) * 1976-03-10 1977-10-04 N L Industries, Inc. Selective firing system

Also Published As

Publication number Publication date
NL80264C (ref) 1955-08-15
DE920233C (de) 1954-11-15
FR1044580A (fr) 1953-11-19
GB705002A (en) 1954-03-03

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