Pyrotechnic fuel for thermogenerators used for processing the productive formation in oil wells

 

The invention relates to the oil industry, in particular the stimulation of wells to increase production of hydrocarbons by thermogenically processing wellbore zone or for hydraulic fracturing by the pressure of the gaseous products of combustion of the pyrotechnic composite material. The technical result is to obtain a pyrotechnic fuel thermogenerators with high deformation-strength properties, high strength and temperature of combustion, and with a high content in the combustion products of galnaftiogas providing chemical treatment of the formation - dissolving not only the carbonate and terrigenous rocks, which increases the porosity of rock matrix, as well as reducing the number of formed solid oxides. Pyrotechnic fuel for processing borehole zone contains, wt%: perchlorate ammonium and/or potassium 40-60, metal fuel 5,0-20,0, thermoplastic halogenated rubber else. Perhaps the content as the metal fuel is aluminum powder, as thermoplastic halogenated rubber copolymer of triptorelin with vinylidenefluoride, Ni is magnesium, the aluminum stearate, or a mixture of any of them, of 1.5 - 4.0 wt.% fluorine-containing modifier is polytetrafluoroethylene. 5 C.p. f-crystals, 2 tab., 1 Il.

The invention relates to the oil industry and can be used to stimulate wells to increase production of hydrocarbons by thermogenically processing wellbore zone or for hydraulic fracturing by the pressure of the gaseous products of combustion thermogenerator.

Known composition pyrotechnic fuel elasticdog type on the basis of potassium perchlorate and ethylene-propylene rubber, used in downhole igniter cartridge [1] and in the pressure accumulators for wells [2]. The disadvantage of this fuel is relatively low specific power - “the power and the presence in the combustion products of a large number of solid particles that do not produce useful work in the well. Such a composition suitable for hydraulic fracturing, but unsuitable for thermographically handle it, because when burned it produces little gas, and it is not formed of a substance capable of chemical interaction with the skeleton of the breed.

Known pyrotechnic composition Tobin. Fuel suitable for chemical processing perforations in the reservoir, as in the combustion products it contains hydrochloric acid (model HC1), solvent skeleton rock, which increases its porosity and hence permeability to oil. However, this fuel is unsuitable for heat treatments and fracturing because it has a small temperature combustion and “power”. In addition, most of the components soluble in water, therefore use it in wells, it is necessary to use a durable waterproof case.

Also known composition pyrotechnic fuel [4] containing the metal fuel powder of magnesium or aluminum, or their mixture in an amount of 50-75 wt.%, inorganic oxidizer nitrates of alkali or alkaline earth metals in the number 19-40 wt.%, and as the binder is an organic resin of 5 to 6 wt.%. Products from this hydroregime fuel enclosed in a sealed Cabinet, during its combustion in borehole water environment produces a great amount of heat and steam, which can create a single pressure pulse of a given magnitude. The disadvantage of this fuel is that the products of combustion, a very large caliginosa blowing perforations, able to clog the natural pores. In addition, during fuel combustion are not formed hydrogen halides (for example, model HC1), capable of producing a chemical effect on the skeleton of the breed. Fuel is suitable mainly for thermal treatments and absolutely not suitable for chemical treatments wellbore zone.

The closest analogue to the invention is a pyrotechnic fuel for processing borehole zone containing inorganic oxidizer is ammonium perchlorate and/or potassium, ethylene-propylene rubber, various additives, as well as powdered aluminum [5]. Known fuel is also unsuitable for chemical effects on the skeleton of the breed.

The objective of the invention is to provide a pyrotechnic fuel for processing borehole zone having a high processing efficiency oil reservoirs, extensive functionality and allows to simplify the construction of the generator using the proposed fuel.

The technical result is to increase the content of hydrogen halides) in the combustion products of the fuel, providing a chemical treatment layer and reduce the amount of generated solid oxides.

Theatergasse inorganic oxidizer - perchlorate ammonium and/or potassium metal fuel and a binder is a thermoplastic rubber, contains as thermoplastic rubber thermoplastic - halogenated rubber in the following ratio, wt.%:

perchlorate ammonium and/or potassium 40,0-60,0

metal fuel 5,0-20,0

thermoplastic halogenated

rubber else

As the metal fuel it may contain: aluminum powder, and as thermoplastic halogenated rubber copolymer of triptoreline with vinylidenefluoride. In addition, the fuel can optionally contain a plasticizer, such as dioctylsebacate, in the amount of 1.0 to 3.0 wt.%; calcium stearate or magnesium, or aluminum, or their mixture in an amount of 0.5 to 1.5 wt.% and fluorine-containing modifier, such as polytetrafluoroethylene, in the amount of 1.5-4.0 wt.%.

The proposed fuel allowed to obtain the highest power characteristics of the fuel, for example, "power" reaches 1016 kJ/kg, and the temperature of the combustion C.

Use as a binder halogenated rubber copolymer of triptoreline with vinylidenefluoride (rubber SCF-32) containing in the molecule oxidizing fluorine atoms and chlorine, and taket, on the one hand, to reduce the number of required inorganic oxidant in the composition and to provide a high physico-chemical and rheological characteristics of the composition, and to improve the content of galaktoboureko (model HC1, HF) in the combustion products of the fuel needed for thermographically processing layer. These substances are dissolved in water, form respectively hydrochloric acid, dissolving carbonate rock (caso3+2hcl=CaCl2+H2CO3), and hydrofluoric acid, the solvent not only carbonate and terrigenous rocks, which increases the porosity of the formation matrix.

The fuel may contain other thermoplastic halogenated rubbers, for example SCS-26 - a copolymer of vinylidenefluoride with HEXAFLUOROPROPYLENE.

It is important to emphasize that the combustion products of the proposed fuels total content of hydrogen halides (Hcl+HF) ~ 1.5 times larger than the Hcl content in the combustion products known analogues of fuels based on ammonium perchlorate (HF absent).

Technological additives (metallic stearates) reduce external friction compositions and their processing into finished product is a highly efficient method of passing presso reduces the viscosity of the composition, that also provides the necessary level of rheological and technological characteristics of the fuel.

The combination of high energy, rheological and mechanical properties of the fuel allows you to get the charges of various shapes and sizes, providing the ability to successfully manage a mode of burning combustible elements and, therefore, more effective use for hydraulic fracturing in the regulated mode, depending on the properties of the reservoir and wells. In this case, the combustion of fuel in the well is above the perforations.

High temperature products of combustion of fuel (up to -4000 K) allows you to successfully carry out heat treatment of critical area to reduce oil viscosity and melting paraffin deposits. In this case carry out mechanical combustion of the combustible elements in the perforation zone. The combustion products of the composition contain a large number of gaseous substances, including “long-lived”, is not soluble in water (carbon monoxide, nitrogen, hydrogen), which produce gas-dynamic cleaning perforations, extending natural pores and creating due to pulsations of the gas bubble additional cracks in the rock.

In table.combustion products.

It is important to emphasize that in the gaseous combustion products of the proposed fuel contains, in addition, up to 1.5 times more than in known based on ammonium perchlorate, the amount of Hcl and HF (compare samples 1 and 12 in table.1), which, being dissolved in water, form respectively hydrochloric acid, dissolving carbonate rocks, as well as hydrofluoric acid, solvent terrigenous rocks, which increases the porosity of the formation matrix.

The proposed fuels are characterized by large, compared to adopted for the prototype, values, strength, temperature TVand volume V of the gaseous combustion products (cf arr. 2, 3, 4, 5, 6, 7, 8 samples-prototypes 11, 12, made on the basis of phenol-formaldehyde resin CFF, divinylacetylene copolymer DST-30 and polystyrene PS).

Products from the sample 11 are pyrotechnic tablet received periodic method deaf pressing, which significantly limits the possibility of manufacturing products of different sizes and shapes. In addition, such hydroregime fuel is only functional when using an external oxidant (water). In contrast to the sample 11 compositions are processed into finished products in various sizes and shapes high the required use of external oxidants.

Great content in the proposed fuels hydrophobic binding material (SCF-32 + f-4) has significantly reduced the leaching of the products in the downhole fluid NH4ClO4in its pure form is highly soluble in water. In specially conducted experiments withstood products 20/0-80 from the fuel with ammonium perchlorate (arr. 7) in the aquatic environment under the pressure of 50 MPa and a temperature of 100With during the day. The product retained the physico-mechanical and ballistic characteristics, the mass loss was 5-6%. Under the same conditions products from fuel-prototype (arr. 12) is completely destroyed. Interestingly, products 20/0-80 from the proposed fuels (mostly 7) preserved the integrity and ballistic performance, even after exposure in the aquatic environment under more severe conditions (P=50 MPa, T=180C, 24 h), the mass loss in this case was 15-18%. This fact allowed us to simplify the design of the device, because there is no need to use a hermetic enclosure. No body can significantly reduce the blocking wells unburned fragments.

Use modifier f-4 in the proposed fuel provides not only the required rheological and is ashodaya any fuel prototype-based DST-30 (table.2).

The proposed fuel with 1.5-4.0% modifier differ from the known analogues significantly higher values of physico-mechanical characteristics (tensile uniaxial tensionp3-5 times and discontinuous deformationp1.3-2.7 times).

The proposed composition of the pyrotechnic fuel allows you to make a universal thermogenerator for use in wells, it can successfully apply:

for hydraulic fracturing;

for termokataliticheskikh treatments;

- heat treatment of wellbore zone.

The device thermogenerator shown in the drawing. It consists of the igniter element 1 with the channel block combustible elements 2, within which is placed a segment of a logging cable or metal rod 3. Below and above the entire Assembly of elements reinforced lugs 4. Inside the igniter element 1 is placed initiating node 5, is firmly attached to the segment logging cable or a rod. As the initiating node is used or igniter cartridge described in [2], or teploelektronagrevatelya shown in [4]. Thermogenerator works as follows. The abutment is La wireline truck one conductor from the site of initiation is connected to the Central conductor of the cable, the other end to the outer grounded sheath of the cable. Put the Assembly on a given horizon of the well and through the remote serves a pulse of electric current. When this unit is triggered initiation, it ignites and burns first igniter element, and then the block burning elements. After activation of all elements of the rod 3 with the lugs 4, mounted on the cable, rise to the surface.

During the combustion of all elements in the well produces a lot of heat and gases, thus a pulse pressure of a certain (depending on the shape and size of the elements) value that produces the processing of the near-well zone of the reservoir.

Sources of information

1. RF patent №2111448, CL F 42 C 19/08, publ. 20.05.1999, bull. No. 14.

2. A. M. Duvanov, I., Gaivoronsky. A new generation of powder gas-generating device for stimulation of wells. NTV “Carotenic”. Publishing house (Russia), Tver, 1999, issue 58.

3. RF patent №2173767, CL E 21 In 43/117, publ. 20.09.2001, bull. No. 26.

4. RF patent №2124630, CL E 21 In 43/25, publ. 10.01.1999, bull. No. 1.

5. RF patent №2182147, CL 06 D 6/06, publ. 10.05.2002, bull. No. 13.

Formula of the picture is cyclical - perchlorate ammonium and/or potassium metal fuel and thermoplastic rubber, characterized in that as a thermoplastic rubber it contains thermoplastic halogenated rubber, in the following ratio, wt.%:

Perchlorate ammonium and/or potassium 40,0 - 60,0

Metal fuel 5,0 - 20,0

Thermoplastic halogenated rubber Else

2. Fuel under item 1, characterized in that the metal fuel contains aluminum powder.

3. Fuel under item 1 or 2, characterized in that thermoplastic halogenated rubber copolymer contains triptoreline with vinylidenefluoride.

4. The fuel according to any one of paragraphs.1-3, characterized in that it further contains a plasticizer, such as dioctylsebacate, in the amount of 1.0 to 3.0 wt.%.

5. The fuel according to any one of paragraphs.1-4, characterized in that it further comprises a stearate selected from the range of calcium stearate, magnesium stearate, aluminum stearate or a mixture of any of them in a quantity of 0.5-1.5 wt.%.

6. The fuel according to any one of paragraphs.1-5, characterized in that it further contains a fluorine-containing modifier, such as polytetrafluoroethylene, in the amount of 1.5-4.0 wt.%.

 

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FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

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