Firing device for powder pressure generators

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to an oil-and-gas industry, ferrous industry, oil and gas wells, water-supply wells, injection wells, and also to blasting works and it is purposed for equipment of powder pressure generators, first of all, capsule-type sealed generators designed for explosion and thermal-gas-chemical treatment of bottomhole formation zone by fire gases in order to intensify extraction of mineral products. Firing device contains blasting cartridge of electric type in protective shell or safe mechanical detonator without initial detonating agent, secondary cartridge of mixed solid fuel placed inside a perforated metal tube and detonating cord in a metal shell or exploding wire placed in a channel of secondary cartridge block at its symmetry axis.

EFFECT: invention allows essential increase in stability of ignition of the secondary and primary charge of a gas generator thus reducing costs for wells retreatment, elimination of expensive equipment and accessories such as exploders, logging cable, and increase in safety of well operations.

2 cl, 1 dwg

 

The invention relates to oil and gas, mining (oil, gas, water, injection wells), as well as the explosive case, and is intended for picking propellant gas generators pressure, allowing the gap and termoliticheskogo processing bottom-hole formation zone gaseous products of combustion of the charge of solid fuel in order to intensify the extraction of minerals: oil, gas, including coal seams, metals when producing their method of underground leaching, water, etc.

The productivity of wells in the world practice is a variety of technological methods and technical means. Among the most effective and the most commonly used technologies include hydraulic fracturing, the processing by the explosion of the near-wellbore zone, chemical treatment of productive reservoirs, processing sonar and high-vibrational oscillations, thermal treatment, machining powder pressure generator. The most versatile, possessing the full range of impacts (mechanical, chemical, physical, thermal) in the near-wellbore area of the formation method is based on the combustion of the charge of solid fuel in wells in the treatment area. Devices, allowing ongoing, the better the handling, are powder pressure generator. Work on the creation of such downhole pressure generator are conducted in our country and abroad (mainly in USA) somewhere in the early 60-ies of the last century. It may be noted that the development of getgeneration in the United States with the use of gunpowder and rocket fuels aimed at creating housing repeated use, creating a high-power short-pulse load, leading to the formation of the breed many cracks of small extent. Development of gas generators in the USSR (later Russia) were focused mainly on the creation of open-frame devices with the use charges solid rocket fuels in the form of channel pieces, after combustion which on the surface is extracted mostly just carrying geophysical cable. Such generators have received the abbreviation pgdbg - powder pressure generator open frame. Known pgdbm with fast and slow burning charge, able, respectively, to form many small cracks length or a single crack great length.

Regardless of the type of generator one of the most important sites of its design is the ignition device (or ignition system). For large quantity generators used in practice (as besco is pusnik, and hull), the ignition device includes igniter or explosive cartridge, cut the detonating cord (LH) and link checker solid rocket fuel, in the channel where LH. Part of the ignition device may include perforated metal tube, inside which is all the above [14]. Almost similar device ignition detonation actions, but without the perforated tube placed in the channels armored charges from mixed solid fuel containing an explosive cartridge and detonation cord, and included in the design of the gasifier for coal seam degasification, described in the patent [5]. It should be noted that the use of igniter cartridge to initiate the LH is not entirely justified. According to the terminology of electric blasting", recommended by the Interdepartmental Commission on explosives (Vol. No.-248, M, IGD them. A.A. Skochinsky, A.A., 1976), with some additions and changes in accordance with GOST on terminology means of initiation and terminological dictionary "Mining" (M., Nedra, 1981) incendiary cartridge is designed for simultaneous ignition of the beam igniter cords (OSH). For initiating combustion of one segment of OSH are electrically power aikaterina tube (ETT) and electrosurgical igniter cord (EZ-OSH). The main form of explosive transformation LH is not combustion, and detonation. Thus, the standard means of initiation of explosive transformation (blasting) LH should be only the detonators (electric or nonelectric) and explosive ammo.

Therefore, the device ignition detonation type in the structure of the gas generator [4], made by the scheme of figure 4, taken as a prototype.

The device consists of an explosive in a protective sheath of the cartridge, a perforated tube and a charge of mixed fuel in the channel which is placed detonating cord.

The main disadvantage adopted for the prototype device ignition associated with use in its construction segment LH as detonation igniter additional charge of mixed solid fuel. Detonating cord - a long charge vysokobarnogo explosives (he), do not have a dense shell. As the shell LH used flax yarn, cotton yarn, cellulose, polyamide, fluoropolymer film, polyvinylchloride and polyethylene compounds, coatings based on silicone rubber and the like, practically do not interfere in the initial moment of detonation equipment LH side expansion of detonation products (DP) and not giving at fracture fragments. The volume of the gaseous products of the explosion, all the while a small and therefore is not large and the rate of radial expansion of PD; in turn, this leads to the fact that the determining factor of ignition is the heat transfer from the hot products of the explosion to the surface of the channel inflammable additional charge of fuel. A consequence of the heat of detonation mechanism of ignition is the need for a fairly prolonged exposure to the hot gases in the fuel (ignition delay period may reach values of the order of tens of milliseconds or more). As a result not very high stability of the ignition.

The task of the invention is the design of the ignition device with a very small and, most importantly, very stable ignition delays, which will provide high uniformity of operation of the entire gas generator.

The problem is solved in that in the construction of the ignition device, taken as a prototype, detonating cord replaced with elongated detonating charge (DUHS). DOUZ is a long charge vysokobarnogo explosives (mostly from HMX or RDX) high density (0.9 and higher density single crystal), enclosed in a metal (copper, aluminum, steel and others) shell. Duty can have the generatrix of the shell cumulative excavation (for EOI is avnoj cutting structures) or to be without a notch (circular cross section). With all the variety of designs, types elongated detonating charges, currently produced in our country, most appropriate for the ignition devices can be considered Duty (or "semi" - pipe equipped TSN) development SPE "Krasnoznamenets", produced in small series according to GOST Muraskin instrument-making plant, and elongated shaped charges (installation) and extra long charge (KM) development of the Military Academy. F.A. Dzerzhinsky produced according to TU. The primary type of EXPLOSIVES used in Dozakh (TSN) - HMX; ukz and ULTRASONIC RDX. In fairness it should be noted that HMX is more resistant to heat CENTURIES than the RDX, which must be considered when the generators in wells under conditions of elevated temperatures and hydrostatic pressures. Fundamentally it is possible to equip Duty and ukz (UZ) is more resistant to heat CENTURIES - such as NTFA, GNDS, STS. As materials of the shells oblong charges (according to GOST and TU) used copper and aluminum. Manufactured according to GOST Duty come with glued end caps filled with EXPLOSIVES. They perform two functions simultaneously: increase the initiating pulse from the means of initiation and seal the ends Duza, which is also much important when the gas generator in the environment of the borehole fluid.

Ignition of the charge of fuel is (additional charge) upon detonation Duza in the channel checkers is not heat (as in the case of LH) mechanism, and on shock mechanism. The leading factor determining the dynamics of ignition, is the shock-wave heating fuel from the surface of the channel under the action of high-speed metal shrapnel shell Duza. Shock pressure (the pressure when hit by shrapnel shell DUZ fuel) than the so-called critical pressure at which the guaranteed excitement in the fuel explosive transformation in the form of combustion. In addition, the shock pressure generated by the fragments of DOUZ in any mixed solid fuel, at least two orders of magnitude higher pressures: the so-called quasi-static produced by the detonation products of DOUZ, and the pressure generated in the channel checkers air shock wave. Such a situation is realized, as shown by the results of direct experiments, when the gaps between DOUZ and the arch of the fuel pieces together to form a 58 mm With very small gaps there is a tendency to equalize the values of all three above-mentioned pressures.

As a result of implementation of the percussive mechanism of ignition of the fuel ignition delay be very small (amount to a few tenths or hundredths of milliseconds) and very stable; this ensures high uniformity of action of the device of the ignition and the gas generator as a whole.

Another technical result that m which can be obtained by using the proposed technical solutions, lies in the substantial reduction of weight (sample) detonation of EXPLOSIVES in the igniter - Duse compared to LH, as in recent rig has a density close to the initial (only cords brands DSTT equip tablet CENTURIES, and tablets are essential geometrical dimensions), and in Douz density EXPLOSIVES closest, as already noted, to the density of the single crystal. In addition, CENTURIES in the case of the use of DOUZ as the igniter should mainly only for the destruction of the metal shell charge and throwing formed fragments, but not for heating and ignition of the fuel checkers, as in the case of LH. Excess capacity DUZ even harmful, because it can cause fragmentation of the additional charge of fuel into multiple fragments and lead to convective burning it (instead of layer-by-layer). Estimates show that the replacement of LH in the ignition device for DUHS leads to lower hinge CENTURIES and apparatus of 1.52 times.

The proposed device ignition and provides non-electrical methods of initiating detonation in Douz. For example, instead of the explosive cartridge (1) can be successfully used mechanical thermo detonator type CLM-260 development of Russian Federal nuclear center-all-Russian research Institute of JFK, not containing initiating EXPLOSIVES. Staff it is designed to initiate detonation of an explosive chain of cumulative p is Horatio and torpedoes, deployed on tubing in oil and gas wells with temperatures up to 260C. is Set in a sealed cavity blast head is driven by the mechanical impact of the steel piston is accelerated by the pressure of the well fluid.

Features mechanical detonators type CLM-260 are:

- insensitivity to stray currents, electromagnetic interference and electrostatic discharges;

security at quasi-static loading and drop on a rigid base;

- devozbuzhdenie unauthorized detonation under mechanical shock and fire.

Thus, when changing the design of the device ignition of an explosive cartridge mechanical detonator dramatically increases the safety of operations on the well. In addition, there is no need to use expensive geophysical cable, which lowered the gas generator to the wellbore zone. It can be successfully replaced, for example, steel cable or rope. Devices blasting is also not needed; the cost of maintaining teams of highly skilled demolition will be significantly reduced.

The claimed technical solution differs from the prototype to the presence of a number of significant new features. The design of the device ignition LH, playing the role of detonation the first igniter replaced by DUHS; an explosive cartridge electric type initiator CENTURIES replaced by a mechanical detonator without initiating EXPLOSIVES. These differences allow to draw a conclusion on the compliance of the claimed solution to the criterion "Novelty".

In scientific and technical literature is not found solutions with the following essential characteristics, therefore, the claimed solution meets the criterion of "Inventive step".

The claimed device contains standard items and products from the explosive case, therefore, the present invention meets the criterion of "commercial significance". Schematically, the construction of the device shown in the figure, 1 is an explosive cartridge or mechanical detonator; 2 - DUZ installed on the ends of the reinforcing caps filled with EXPLOSIVES; 3 - piece extra charge mixed solid fuel; 4 - perforated metal tube.

The principle of the proposed device is quite simple and clear from the picture. When applying an electric signal to the electric detonator explosive cartridge (1) or mechanical impact of the steel piston is accelerated by the pressure of the well fluid (for mechanical detonator) recent fires and through the cap initiates detonation in Douz (2) from the side adjacent to the explosive cartridge (detonator) end. P and detonation DUZ (2) are formed of high-speed fragments of the metal shell (and caps too) as well as gaseous products of detonation of high temperature and air shock wave in a channel of the fuel checkers additional charge (3), the axis of which is DUHS. When hit by shrapnel in the wall of the channel of the additional charge (3) in the fuel arise shock pressure significantly exceed the so-called critical value required for ignition of this fuel type. At the same time additional charge (3) there are pressure generated by the detonation products of equipment DUHS and the air shock wave, which also contribute to the ignition of an additional charge (3). However, a decisive contribution to the process of ignition contribute shrapnel shell DOUZ, because of the shock pressure, as already noted, at least two orders of magnitude larger than the pressure generated by the PD and the air shock wave. Through the holes in the perforated tube (4) additional charge (3) ignites the igniter charge of the gas generator (not shown), the channel of which is placed the inventive ignition device.

The positive effect from the use of the proposed device is that the replacement of LH on DUHS significantly reduces the ignition delay of the fuel checkers additional charge and makes them very stable, ensuring a high uniformity of action of the gas generator is in General. The proposed device also allows to significantly reduce the sample CENTURIES in the apparatus, to increase the safety of blasting operations on the well and reduce costs.

Sources of information

1. Haney B., D. Cuthill Technikal review of the high energy gas stimulation technigue. Computalog Ltd., 1996.

2. Pat. 2018508 Russian Federation, IPC7C06, C5/00. Solid downhole gas generator / Krewenki E, Kolesov S.M., Pavlov V.I., Chelyshev VP; applicant and patentee of vsesojuz. scientific-issled. and project designer. Inst. for explosive methods Geophysics. intelligence. No. 4800099/23; Appl. 02.01.90; publ. 30.08.94, bull. No. 16.

3. Pat. 2047744 Russian Federation, IPC7C1.6, E21B 43/11, 43/26. Device for stimulation / Gaivoronsky I.N., Krushenko E; applicant and patentee the age of three. scientific-research and project-design. Inst. for energy of the explosion in Geophysics. No. 5033540/03; Appl. 23.03.92; publ. 10.11.95; bull. No. 31.

4. Pat. 2175059 Russian Federation, IPC7EV 43/263. The gas generator solid fuel with adjustable pressure pulse for stimulation / Krewenki E, Gribanov NI.. Gawronski I.N. and others; applicant and patentee the age of three. scientific-issled. and project designer. Inst. for energy of the explosion in Geophysics; Federal research and production. Center "Altai". No. 99121133/03; Appl; 06.10.99; publ. 20.10.01; bull. No. 29.

5. Pat. 2401385 Ross the library Federation, IPC7E21F 7/00, E21B 43/263. A gasifier for solid fuel coal seam degasification / Humanities A.A., Gribanov NI, Agarkov A.V. and others; applicant and patent holder of the limited liability Company "Scientific-production company "Techservice"". No. 2008133398/03; Appl. 15.08.08 Dnipropetrovs; publ. 10.10.10; bull. No. 28.

1. Detonation ignition device for the powder pressure generator including an explosive in a protective sheath cartridge, perforated metal tube and an additional charge of mixed solid fuel, characterized in that along the axis of the channel of the additional charge placed elongated detonating charge vysokobarnogo explosives in a metal shell with densely planted on its end faces of the sealing and simultaneously amplifying caps filled with explosive, and detonating the extended battery installed so that between its shell and code checkers additional charge was maintained the gap.

2. Detonation device according to claim 1, characterized in that the explosive cartridge is made in the form a secure mechanical heat-resistant detonator that does not contain primary explosives.



 

Same patents:

FIELD: method for control of fuses due to perfection of the structure and redistribution of the function between the elements of the fuse block diagram.

SUBSTANCE: the method consists in the use of a processor transducing the signal of sensory devices according to the preset program of functioning to out signals controlling the output actuating device providing the direct control of ammunition action. In addition, the processor uses the signals of the device measuring the environment parameters, and the sensory and output actuating devices in the fuse are selected depending on the kind of ammunition action, in this case use is made of sensory devices, device for measuring the environment parameters and output actuating device with a single data format.

EFFECT: determined a rational number of modifications of one fuse substituting the constructions of various types in articles of different designation.

1 dwg

Fuse // 2204112
The invention relates to explosive and can find application in the mining industry, aviation and space technology, with the rescue operations, including in the conditions of strong electromagnetic fields and stray currents, and specifically to devices for pulse detonation mechanical team

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The invention relates to mechanical fuzes designed for initiating detonation of the main charge warhead

FIELD: oil and gas industry.

SUBSTANCE: device for thermal gas-hydrodynamic oil and gas formation fracture comprises a logging cable with a cable head and consists of a remote control unit with a gamma sensor, an instrument head, a mandrel sub, a gas-generating charge case and an independent logging unit. The gas-generating charge of a high-energy antiknock solid-fuel composition is presented in the form of sticks of the external diameter of 36-70 mm and the length of 300-1500 mm with an axial passage of the diameter of 5-28 mm with an electrical igniter. The charge is positioned in a case of the diameter of 89 mm with a wall of the thickness of 9-11 mm and a gas outlet channel of the area of 70% a cylindrical surface of the case with end adapters of the diameter of 105 mm. The adapters are used as formation targeting raisers with the efficiency of the dynamic action effectiveness being a multiple greater than uncased gas generators. The real-time pressure and temperature time history is recorded by independent digital devices at the discretion of 8.0-10.0 thousand measurements per second. To provide better emergency tolerance and to make the gas generator advance into wells at a zenith of 90 or more, the multilayered logging cable of the diameter of 8-28 mm and the tensile strength of 60-250 kN is used.

EFFECT: more effective involvement of terminal oil-saturated sites.

3 cl, 2 dwg, 1 app

FIELD: mining.

SUBSTANCE: heat source comprises a body, which is equipped with a composite material that generates gas during combustion and actuates from an electric spiral, and layers of epoxide compound and thiocol-based sealant sealing the ends of the material of the gas-generating composition. The composite material of the heat source that generates gas during combustion contains efficient amount 20 wt % of powdery polyvinyl chloride chlorinated resin of brand PSH-LS at the following ratio of composition components, wt %: granulated ammonium nitrate of grade B - 57.00.2; potassium bichromate - 3.00.1; aluminium powder of grade ASD-4 - 5.00.1; barium nitrate - 15.00.2; polyvinyl chloride resin of grade PSH-LS - 20.00.2. The gap produced in the outfit between sticks and the body of the heat source is filled with a filling solution capable of hardening. Between the igniter and the composite material the heat source comprises layers of additional igniting composition with the capability of its ignition from the igniter and ignition of the gas-generating composition at the end and along the surface of the heat source channel.

EFFECT: increased safety of operation, transportation and storage of a device for hydraulic rupture of a bed.

2 dwg

FIELD: oil and gas industry.

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9 cl

FIELD: oil and gas industry.

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2 cl, 2 dwg

FIELD: oil and gas industry.

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2 cl, 4 dwg

FIELD: oil and gas production.

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EFFECT: higher completeness of powder charge combustion and efficiency.

FIELD: oil and gas industry.

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6 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: gas generator includes the main solid fuel charge, ignition device in cylindrical housing with sealing assemblies in upper and lower parts and fixed piston in upper part of cylindrical housing with possibility of its being cut at the specified external pressure, and temperature promoter. According to the invention, lower end of tubing string is plugged with plate with central hole for installation of hydraulic connection of tubing string and ignition device located in lower part of gas generator. A tube connecting the tubing string to the top of ignition device is inserted into that hole. External perforated housing with solid fuel for combustion transfer to the main solid fuel charge is arranged in addition in ignition device connected to the main solid fuel charge by means of clutch coupling. Lower part of ignition device is plugged with solid fuel plate and cylindrical perforated limit switch.

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3 cl, 1 tbl, 1 dwg

FIELD: oil and gas production.

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2 cl

FIELD: oil and gas industry.

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4 cl, 3 dwg, 4 ex

FIELD: chemistry.

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6 ex, 1 tbl

Capsule mixture // 2454387

FIELD: chemistry.

SUBSTANCE: invention relates to pyrotechnic compositions used in cartridges or charges with circular ignition and specifically to capsule mixtures. The disclosed capsule mixture is free from lead, barium, peroxides and oxidants and contains one or more primers, one or more sensitising agents and/or one or more abrasive agents and from 0.01 to 2 wt % boric component, preferably boron and/or boron derivatives, preferably boron nitride and/or zirconium boride.

EFFECT: disclosed composition provides improved tribological characteristics of residual combustion products, high operational reliability and long service life of parts of weapons, cartridge-operated guns or for stunning cattle.

21 cl, 1 tbl, 6 ex

Igniter composition // 2433110

FIELD: chemistry.

SUBSTANCE: invention relates to an igniter composition which can be used for mechanical as well as electric ignition systems, e.g. in car safety systems, in ammunition and cartouche boxes for devices with a choke. The disclosed composition contains a salt of an alkali and/or alkali-earth metal of styphnic acid and specifically potassium-calcium styphnate, basic calcium styphnate and/or basic potassium-calcium styphnate.

EFFECT: wider range of igniter compositions which do not pollute the environment and are reliable during use.

16 cl, 1 tbl, 2 ex

Igniter composition // 2421438

FIELD: chemistry.

SUBSTANCE: invention relates to igniter compositions for electrical igniters. According to the invention, the composition which contains lead chromate, potassium chromate and lead rhodanate, also contains a metal-ceramic powdered composition based on carbides of group IV-VII transition metals, cemented by an iron subgroup metal in amount of 6-25%.

EFFECT: inclusion of a modifying additive into the composition in amount of 1-10%, over 100%, enables to stabilise particle-size composition of the product, increase accuracy of operation of electrical igniters and increase igniting capacity.

3 tbl

FIELD: explosives.

SUBSTANCE: charge to excite seismic oscillations comprises a cartridge with an axial channel and a dead hole made at one of the ends, where an intermediate initiator (II) is located, as well as a fixing element (FE), which prevents II fallout from the cartridge. The FE is arranged in the form of a ring with the inner concave or straightened face at the upper end. The charge elements are made of an explosive, which contains the following components in certain ratios - a ballistic solid rocket propellant (BSRP) or a composition of BSRP and a ballistic artillery powder, and a brisant explosive, technological, retarding and hydrophobic additives. The method to make the charge includes operations of FE moulding or joint moulding of FE and II directly in the dead hole of the cartridge, as a result of which the charge elements form undetachable connections.

EFFECT: improved serviceability at low temperatures and long-term stay in flooded wells.

18 cl, 8 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to an inflammable composition and uses thereof. The composition contains an explosive fraction which contains at least one primary explosive substance, a redox system and binder-plasticiser. The explosive fraction in the composition makes up 9-35 wt % of the composition. The primary explosive substance is tetrazene, which makes up 95 wt % of the said explosive fraction.

EFFECT: explosive fraction does not contain lead.

21 cl, 3 tbl, 1 ex

FIELD: process engineering.

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EFFECT: higher rate and stability of combustion, improved firing characteristics.

2 cl, 3 dwg, 1 tbl, 4 ex

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