Gas-generating fuel for downhole apparatus

IPC classes for russian patent Gas-generating fuel for downhole apparatus (RU 2401254):

C06D5/06 - by reaction of two or more solids

C06B29/22 - the salt being ammonium perchlorate

Another patents in same IPC classes:

Gas-generating fuel for downhole apparatus / 2401253

Gas-generating fuel contains an oxidising agent and fuel. The oxidising agent is ammonium perchlorate and the fuel is a thermoplastic fuel in form of a chlorine-containing thermoplastic polymer or its mixture with a chlorine-containing low-molecular weight compound in ratio of 1:0.1-1:2, with the following ratio of components, wt %: oxidising agent 60.0-80.0, thermoplastic fuel 20.0-40.0. The chlorine-containing thermoplastic polymer is chlorinated polyethylene or polyvinylchloride or chlorinated polyvinylchloride or chlorosulphonated polyethylene. The chlorine-containing low-molecular weight compound is chlorinated paraffin wax or methyl chloroform, or tetrachloroethane or perchloroethylene or dichlorobenzene or hexachloro-p-xylene. The fuel also contains a process additive - calcium or zinc stearate in amount of 0.05-1.0 wt %.

Gas-generating fuel for downhole apparatus / 2395482

Invention relates to solid gas-generating solid fuels. The gas-generating fuel for downhole apparatus contains ammonium perchlorate as an oxidising agent, synthetic hydrocarbon rubber which is plasticised with hydrocarbon oil in mass ratio of 1:1…1:5 as fuel, aluminium, process additives, a vulcanising agent and ammonium chloride as a gas-generating additive.

Method of making mixed solid fuel charge / 2395479

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Method of making articles from mixed solid rocket fuel / 2394011

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Solid fuel low-temperature gas-generating composition / 2393140

Invention relates to solid fuel gas-generating compositions. The solid fuel low-temperature gas-generating composition contains ZV ammonium nitrate, guanylurea dinitramide and methylpolyvinyltetrazole.

Gas-generating fuel for downhole apparatus / 2393139

Invention relates to gas-generating solid fuels. The gas-generating fuel for downhole apparatus contains ammonium perchlorate as an oxidising agent, synthetic hydrocarbon rubber plasticised with hydrocarbon oil as fuel, lecithin, epoxy resin, ortho-tert-butyl-para-cresol or tertiary butylphenol as a processing additive, paradinitrosobenzene or quinol ether as a curing agent, ammonium chloride as a gas-generating additive. The synthetic hydrocarbon rubber used can be isoprene, butadiene, ethylenepropylene, isoprenedivinyl or butyl rubber and the hydrocarbon oil can be transformer, aviation or industrial oil.

Low-temperature solid propellant / 2389714

Invention relates to making gas-generating low-temperature solid propellants. The low-temperature solid propellant contains ammonium nitrate as an oxidising agent, SKDM-80 rubber as polymer fuel, di-N-oxide-1,3-dinitrile-2,4,6-triethylbenzene as a hardener and dinitrophenoxyethanol as a combustion rate catalyst.

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Manufacturing method of charge from ballistic solid propellant / 2384555

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Gas-generating fuel for downhole apparatus / 2401253

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Thermoplastic gas-generating high-power pyrotechnic composition / 2394800

Invention relates to pyrotechnics. The thermoplastic gas-generating pyrotechnic composition contains binder - a mixture of a copolymer of butadiene and nitrile of acrylic acid with phenol-formaldehyde resin and an oxidising agent - ammonium perchlorate at a defined ratio of components. The composition can be used to carry out work in actuating mechanisms of pyro-automatic devices.

Gas-generating fuel for downhole apparatus / 2393139

$Method for fabrication of ammonia perchlorate containing hydrophobisated fraction$ Method for fabrication of ammonia perchlorate containing hydrophobisated fraction / 2363690

Invention refers to the fabrication of ammonia perchlorate for composite solid propellant. The fabrication method of ammonia perchlorate containing the hydrophobisated fraction includes the preparation of the hydrophobizated fraction with specific surface area from 5400 to 7300 cm²/g having alkylsiloxane coating with mass content from 0.11 to 0.25 wt %, addition of the said hydrophobizated fraction to ammonia perchlorate in the amount of 1.5 to 77 wt % and mixing in the drum mixer having cylinders with height and diametre 30-40 mm made from elastic polyurethane. The hydrophobizated fraction of ammonia perchlorate is fabricated and packed to the bags with calculating of the arithmetic mean of the alkylsiloxane content in the fabricated bags round to the nearest hundredths. The hydrophobizated fraction used for addition to ammonia perchlorate has alkylsiloxane content departure from arithmetic mean value no more than ±0.01 wt %.

Process of preparing micronized ammonium perchlorate / 2310635

Invention provides micronized ammonium perchlorate for mixed propellant comprising preparation of lecithin solution in dispersion liquid, preparation of ammonium perchlorate slurry in this solution, and reduction of slurry in bead mill in presence of glass beads. Solution of lecithin in dispersion liquid is prepared via dissolution of lecithin in 2.7-15.0% of the total amount of dispersion liquid, filtration of resulting solution, addition thereof to the rest of dispersion liquid, and stirring. As dispersion liquid, fluorodichloroethane is utilized. Reduction of slurry in bead mill is carried out at temperature not exceeding 25°C.

Method of hydrophobization of ammonium perchlorate / 2287510

The invention is pertaining to the process of production of the blasting explosives. The invention presents the method of hydrophobization of the ammonium perchlorate including the treatment of ammonium perchlorate with the oil-wetting agent - methyltrichlorosilane vapor-phase in two stages. At the first stage ammonium perchlorate is mixed with ammonium bicarbonate, and the gained mixture is ground at simultaneous feeding of the oil-wetting agent. At the second stage the produced ground mixture is averaged and mixed with ammonium bicarbonate and treat with the oil-wetting agent. Process of hydrophobization at the second stage is completed at pH of the gaseous products of no less than 6. The invention allows to reduce consumption of the oil-wetting agent.

Method for decreasing volatility of carboxylate rubber-base solid-propellant compositions of liquid ferrocene compounds and high-modulus carboxylate rubber-base solid-propellant composition and liquid ferrocene-containing catalytically active plasticizer / 2276162

Invention relates to using ferrocene-containing catalytically active plasticizers in high-modulus solid-propellant composition for different designations possessing the enhanced exploitation stability and broadly regulated range of the combustion rate. The composition comprises the following components: 60-80 wt.-% of oxidizing agent, for example, ammonium and potassium nitrate or FPCh; 2-20% of aluminum; 5-15% of liquid carboxylate rubber; 1.5-3.5% of epoxy resin, for example, epoxydiane resin ED-20 or resin EC-N; 0.01-4% of liquid ferrocene compound; 0.5-3.5% of co-plasticizer, transformer oil and/or DBS; 0.05-0.5% of hardening accelerating agents, and 0.01-0.2% of surface-active substances. Method for preparing high-modulus solid-propellant composition of reduced volatility of liquid ferrocene compound involves preliminary dissolving the ferrocene compound in co-plasticizer in the mass ratio = (20-80):(1-99) followed by plasticizing a polymeric binding agent and its mixing with surface-active substance, aluminum, oxidizing agent and hardening accelerating agents. Invention provides enhancing the strength properties of the composition.

Ammonium perchlorate preparation method / 2246472

Invention proposes a method for preparation of ammonium perchlorate for compounded solid rocked fuel, which is characterized by preparation of coating solution in liquid carrier via dissolution of lecithin in trifluorotrichloroethane or methylene dichloride, preparation of ammonium perchlorate suspension from ammonium perchlorate and above-prepared solution, breakage of suspension by means of glass beads on two twin mills during 1 to 10 h until ammonium perchlorate having particle size 2.0 to 1.0 μm is obtained in case of batch operation mode and during 8 to 16 h to ammonium perchlorate particle size 1.0 to 0.55 μm in case of stepwise charging of lecithin at 3 h intervals, and drying. When number of dead mills and working room of mixer are changed, breakage time is found with the aid of special formula.

Method of waterproofing ammonium perchlorate / 2211207

The invention relates to techniques for preventing caking powdery water-absorbing materials, namely inorganic oxidizing agents used in the manufacture of composite solid rocket propellant and pyrotechnic compositions

Ammonium perchlorate preparation method / 2246472

FIELD: chemistry.

SUBSTANCE: gas-generating fuel contains an oxidising agent and fuel. According to the invention, the oxidising agent is ammonium perchlorate and the fuel is a metallic fuel in form of aluminium and a thermoplastic fuel in form of a chlorine-containing thermoplastic polymer or its mixture with a chlorine-containing low-molecular weight compound in ratio of 1:0.1-1:2, with the following ratio of components, wt %: oxidising agent -50.0-79.0, thermoplastic fuel 20.0-40.0, metallic fuel 1.0-10.0. The chlorine-containing thermoplastic polymer is chlorinated polyethylene or polyvinylchloride or chlorinated polyvinylchloride or chlorosulphonated polyethylene. The chlorine-containing low-molecular weight compound is chlorinated paraffin wax or methyl chloroform, or tetrachloroethane or perchloroethylene or dichlorobenzene or hexachloro-p-xylene. The fuel also contains a process additive - calcium or zinc stearate in amount of 0.05-1.0 wt %.

EFFECT: production of fuel with high energy output, volume of released gases and content of hydrogen chloride in combustion products.

4 cl, 1 tbl

The present invention relates to the field of creation of solid fuels for use in downhole devices (powder-pressure accumulators wells DT, powder generators pressure PGD and others) for temperature and chemical effects on the bottomhole zone with the aim of increasing the productivity of oil wells, including complicated geophysical conditions.

Known solid fuel that can be used in the downhole apparatus. This fuel-based fluorinated elastomer (U.S. patent No. 3203843 NCI 149-19 declared 24.01.62; Russia's bid No. 2001101664/03 patent, MKI 7 EV declared 17.01.2001), polycellulose binder (patent Sweden No. 323842, MKI C06D 5/06 declared 25.07.65.), polyacrylic rubber (U.S. patent No. 3152027, NCI 149-83 declared 25.05.62.), ethylene propylene diene monomer rubber (patent of Russia №2182147, MKI 7 C06D 5/06, SW 29/22 declared 5.04.2000), the best choice of thermoplastic elastomer (patent of Russia №2183609, MKI 7 C06D 5/06, SW 29/22 declared 5.04.2000).

The disadvantage of fuels patent No. 3203842, 3152027, the patent application 2001101664/03 is a relatively low energy intensity, the presence of combustion products or highly corrosive hydrofluoric acid, which causes corrosion of the equipment and reduced quality of oil or condensed products of combustion (e.g., silicon), causing erosion, scoring is the oil-producing equipment and reduce the permeability of the rocks oil reservoir, or low content in the combustion products hydrogen chloride. Hydrogen chloride is a chemical agent, effectively depleting reservoir sediments and flooded wells, saturating downhole fluid, it forms hydrochloric acid, which dissolves the formation of deposits, thereby increasing the efficiency of thermobaric effects on bottom-hole zone of the well. Low content in the combustion products hydrogen chloride takes place in counterparts (patent Ru №№2182147, 2183609).

The closest adopted for the prototype, is the fuel (patent of Russia №2183609, MKI 7 C06D 5/06, SW 29/22 declared 5.04.2000 published 20.06.2002) based on the best choice of thermoplastic elastomer containing potassium perchlorate as the oxidizer. The prototype has the following disadvantages: not enough high energy intensity and the amount of hydrogen chloride released during the combustion of fuel, and as a result, low concentration of the formed hydrochloric acid, which is an effective chemical agent, a solvent reservoir deposits of various types.

An object of the invention is to develop a gas-generating fuel for squinky apparatus, the combustion of which provides along with thermobaric effect on bottom-hole zone of the well and effective chemical impact of the force on the bottom of the well and effective chemical effects on the productive oil layer due to the presence in the products of combustion of large quantities of hydrogen chloride and/or hydrochloric acid.

The technical result is achieved due to the rational choice of components and establish the optimal of their content in the composition.

The proposed gas-generating fuel for a downhole apparatus, comprising an oxidizer, a thermoplastic fuel and metal fuel. As the oxidant gas-generating fuel contains ammonium perchlorate, and as thermoplastic fuel - chlorinated thermoplastic polymer or a mixture of chlorine-containing low molecular weight compound. As the metal combustible gas-generating fuel contains aluminum. The ratio of the components of the proposed gas-generating fuel the following, wt.%;

The oxidizing agent	50,0...79,0
Thermoplastic fuel	40,0 20,0...
Metal fuel	1,0 10,0...

As the chlorine-containing thermoplastic polymer gas-generating fuel contains chlorinated polyethylene or polyvinyl chloride or chlorinated polyvinyl chloride, or chlorosulphurized polyethylene. As the chlorine-containing low-molecular compounds gas-generating fuel may contain chloroparaffin or metill reform, or tetrachlorethane, or perchloroethylene, or dichlorobenzene, or hexachloro-p-xylene. The optimal ratio of thermoplastic polymer and low molecular weight chlorinated compounds in thermoplastic fuel 1:0,1...1:2.

The gas-generating fuel, in which no chlorine-containing low-molecular compound or its quantity is small, can optionally contain technological additive is calcium stearate or zinc in the amount of 0.05...1.0 wt.%.

The essence of the invention is illustrated by the examples in the table. The data in the table when the well pressure 50 MPa.

An example of manufacturing the gas-generating fuel

The process of manufacturing gas-generating fuel is consistent mixture of chlorine-containing thermoplastic polymer with a metal fuel, process agent and oxidizing agent, stirring the mixture at room temperature over 1,0...1,5 hours the mixture Obtained is formed at a temperature of 120...160°C by extrusion or hot deaf pressing.

An example of manufacturing the gas-generating fuel

The process of manufacturing gas-generating fuel is consistent mixture of chlorine-containing thermoplastic polymer, chloresteral low molecular weight compounds with metal is Kim fuel, technological additives and oxidizing agent, stirring the mixture at room temperature over 1,0...1,5 hours the mixture Obtained is formed at a temperature of 120...160°C by extrusion or hot deaf pressing.

An example of manufacturing the gas-generating fuel

The process of manufacturing gas-generating fuel is consistent mixture of chlorine-containing thermoplastic polymer, chlorinated low molecular weight compounds with metal fuel and oxidizer, stirring the mixture at room temperature over 1,0...1,5 hours the mixture Obtained is formed at a temperature of 120...160°C by extrusion or hot deaf pressing.

As can be seen from table, the combustion of 1 kilogram of a proposed gas-generating fuel is allocated 707...950 liters of gaseous products, combustion products offer gas-generating fuel chlorine-containing thermoplastic fuel has a high content of hydrogen chloride to 242 litres. In terms of flooded wells during the combustion of each kilogram of the proposed gas-generating fuel is formed in terms of a 20%concentration of 1.26...1.98 kg of hydrochloric acid. The proposed gas-generating fuel has a high energy intensity - 87737...106620 kgf·m/kg, the Temperature of the combustion products is 2327...3823 K.

When the content is Anki chlorine-containing thermoplastic fuel less than 20% reduction of the volume of hydrogen chloride, released during the combustion of gas-generating fuel. The increase in the number of chlorine-containing fuel comprising up to more than 40% leads to decrease as the intensity of the gas-generating fuel, and the content of hydrogen chloride in the combustion products. The increase in the number of chlorine-containing low molecular weight compound in thermoplastic composition of fuel more than 2 parts to 1 part chlorine-containing thermoplastic polymer leads to the deterioration of the mechanical characteristics of the gas-generating fuel. When the content of chlorine-containing low molecular weight compound in thermoplastic composition of fuel is less than 0.1 parts to 1 part chlorine-containing thermoplastic polymer gas-generating fuel is similar to the variant in which there is no chlorinated low molecular weight compound. The decrease in the metal content of the gas in the gas-generating composition of the fuel is less than 1% leads to a decrease of the intensity and temperature of the combustion products. Increasing the aluminum content of more than 10% leads to a decrease in the volume of gaseous foods and increasing content of the condensed phase.

Thus, the proposed gas-generating fuel exceeds the prototype for the main performance characteristics - intensity, volume of gaseous ol the combustion products, the content of hydrogen chloride.

1. The gas-generating fuel for a downhole apparatus, comprising an oxidizer and a fuel, wherein the oxidizer agents it contains ammonium perchlorate, and as fuel metal fuel in the form of aluminum and thermoplastic fuel in the form of a chlorine-containing thermoplastic polymer or its mixture with chlorine-containing low molecular weight compound in the ratio of 1:0.1 to 1:2 in the following ratio, wt.%:

The oxidizing agent	50,0-79,0
Thermoplastic fuel	20,0-40,0
Metal fuel	1,0-10,0

2. The gas-generating fuel according to claim 1, characterized in that as the chlorine-containing thermoplastic polymer it contains chlorinated polyethylene or polyvinyl chloride or chlorinated polyvinyl chloride, or chlorosulphurized polyethylene.

3. The gas-generating fuel according to claim 1, characterized in that as the chlorine-containing low-molecular compounds it contains chloroparaffin or chloroform, or tetrachlorethane, or perchloroethylene, or dichlorobenzene, or hexachloro-p-xylene.

4. The gas-generating fuel according to claim 1 that is different is seesa fact, which further includes a technology Supplement of calcium stearate or zinc in an amount of 0.05 to 1.0 wt.%.