The method of initiating combustion in gasteropelecidae processing of oil and gas wells and composition for its implementation

 

(57) Abstract:

The invention relates to the field of oil production. The technical result is to increase the efficiency of initiation of combustion of the fuel charge. Composition for initiating combustion in the borehole contains aluminum and chromium oxide, and further comprises a peroxide, or a sequence superoxide, or ozonid alkali metal, in the following ratio, wt.%: peroxide or sequence superoxide, or ozonid alkali metal 40-94, chromium oxide 0.1 to 5 and the aluminum else, and can optionally contain a plasticizer - dioctylsebacate 0.1 to 5.0 wt.%. The method of initiating combustion in the well is the introduction into the treatment area of the above composition and bringing it into contact with the medium containing water. This medium can be water or 5-30% aqueous solution of hydrochloric acid. The initiator composition is placed in a container in the dehydrated hydrocarbon environment. The container has an insulating membrane. When filing jump into the borehole pressure membranes are destroyed and the composition is brought into contact with water or solution. 2 S. and 6 C.p. f-crystals, 1 table.

The invention relates to the field of oil production and, in particular, to methods of activation marginal and prostiva is for burning solid fuel charges and liquid fuel-oxidizer mixtures of the STATE (hereinafter “fuel charge”), the present invention provides greater reliability and safety of gas-temperature processing of oil and gas wells with simultaneous low cost and environmental safety.

After starting exposure to the initiator within the well starts flowing fast chemical reaction between the components of the initiator with the release of a large amount of heat. As a consequence, the initiating temperature of the mixture increases to several thousand degrees. Initiation involves simultaneous with the beginning of the reaction between the components of penetration of the reaction products in the fuel charge. And as the temperature initiator is significantly greater than the temperature of ignition of the fuel charge located in an oil or gas well, there is a fire and further combustion of the fuel charge. Thus, ignition of the fuel charge in the well.

Known chemical initiator combustion used in solid or liquid form, based on the alkali metal borohydride and methanol or diethyl ether in the amount of 5-95 wt.% [1]. Shipping initiator combustion is carried out by descent sealed to the on the delivery of the initiator by injection. The disadvantage is the need of the use of explosives (cord torpedo) for the destruction of the descent of the container with the initiator of combustion, which significantly complicates the use of technology and safety.

Closest to the proposed are the chemical initiator combustion in oil and gas wells in the form of tablets, consisting of a mixture of powders of aluminum and hexavalent chromium oxide, coated with wax or rosin, and the method of its use through the introduction of the initiator in the treatment area and bring it into contact with the medium containing water, for the implementation of the exothermic reaction [2].

The disadvantage of this initiator of combustion is strong hygroscopicity mixture of powders of aluminum and oxide of hexavalent chromium, the latter eventually decomposes, leading to poor chernivsti initiator and inconvenience when using it, thus reducing the efficiency of initiation of combustion.

The technical result of the invention is to improve the efficiency of initiation of combustion by reducing hygroscopicity and reduce the speed of the decomposition components.

Technical re is th3, further comprises a peroxide or sequence superoxide, or ozonid alkali metal, in the following ratio, wt.%:

Peroxide or sequence superoxide,

or ozonid alkali metal 40-94

The chromium oxide is 0.1-5

Aluminum Else

As the peroxide of an alkali metal it may contain peroxide sodium.

In addition, it can optionally contain a plasticizer, such as dioctylsebacate, in an amount of 0.1-5.0 wt.%.

The technical result is achieved in that in the method of initiating combustion in the well by introducing into the treatment area of the composition to initiate combustion, containing aluminium and chromium oxide, and bringing the composition into contact with an environment containing water, for the implementation of the exothermic reaction as the initiator composition using the above-described composition.

At the same time as environment for conducting exothermic reactions you can use water or 5-30% aqueous hydrochloric acid solution.

In addition, the introduction of the initiator composition in the treatment area can be appropriately placing the composition in a dehydrated hydrocarbon environment. The content in the specified credist by filing the pressure jump, sufficient to rupture the membranes.

Between aluminum and sodium peroxide in the presence of water flows the following exothermic reaction:

In the case of using an aqueous solution of hydrochloric acid also occurs following exothermic reaction:

Na2O2+2HCl2NaCl+H2O2

The formed hydrogen peroxide further decomposes to form water and oxygen:

2H2O22H2O+O2

Oxygen is further involved in combustion reactions. When using sequence superoxide potassium CO2or ozonide potassium CO3proceed in a similar reaction.

The chromium oxide CR2O3also comes in an exothermic reaction with the components of the composition.

The proposed composition is stored and maintains its properties over a much longer time than the part closest analogue, because it contains a much smaller proportion of volatile chromium oxide CR2ABOUT3and peroxides, redoxide and ozonides are more stable compounds than the chromium oxide.

Thermal effects than 5000 kJ/kg of mixture. Accordingly, the temperature of the reaction mixture increased to 1500-2000°C.

3lO3; 165 g NaCl; 25 g of N2About; 23 g O2.

The table shows the formulations of the claimed composition.

Conducted experiments on the ignition of the proposed initiating a mixture of different solid and liquid fuel charges. We used two types of solid fuel charges. The first of them contained ammonium perchlorate, aluminum powder, silicone elastomer SCF-32 and technological additives. As part of a second fuel charge included potassium perchlorate, aluminum powder, silicone elastomer SCF-32 and technological additives. The fuel samples were cylindrical in shape with a diameter of 2 cm, height 2 cm Initiating a mixture of sodium peroxide with aluminum powder were placed in glycerol and were located at different distances from the sample of fuel (2-10 cm). When the experiments as a liquid fuel charge used STATE based on ammonium nitrate - NH4NO3and urea CO(NH2)2with technological additives.

Adding in some experiments, water, and other aqueous hydrochloric acid(5%, 10%, 15%, 25%-Noah) in the initiator mixture was exothermic reaction with the formation of a flame, which has been a steady fire of samples that the Oia offer chemical method of initiating combustion of the fuel charge in the well.

Technology is changing in the well of the combustible mixture is determined by its physical condition. If a combustible mixture is a solid, similar in composition solid rocket fuel, it is like a chemical initiator combustion (HIT) are placed in the joined containers made from aluminum tubes. The containers are attached to the lower part of the casing (tubing), and the container with the HIG is over the container with the fuel charge and is equipped with upper and lower diaphragms (membranes), which, after installation in a given processing interval (perforations) dissolved hydraulic impact (due to exceeding the critical diaphragm pressure achieved with a pump cementing unit), the HIG in the container is in a dehydrated environment.

To release the containers in the processing interval in the well is pumped necessary (determined on the basis of the weight quantities of components HIG) volume of water or 12-15%-aqueous solution of hydrochloric acid, which chemically reacts with the HIG after the destruction of the apertures of the containers.

In the case of pre-injected into the well liquid fuel charge (GOS different modle reaction volume of water or 12-15%-aqueous solution of hydrochloric acid is placed in the tubing above the container. Initiation of the reaction occurs after the above-described hydraulic fracture aperture of the container.

If the depth interval of less than 1200 m above the treatment area is set packer.

In small (up to 1000 m) wells proposed by the initiator of combustion at higher volumes can be used as snowspeeders fuel charge, i.e. without additional solid or liquid fuel charges other elements.

Sources of information

1. RF patent №2153065, E 21 In 43/24, 2000.

2. RF patent №2126084, E 21 In 43/24, 1999.

1. Composition for initiating combustion in the well containing aluminum and chromium oxide CrO3, characterized in that it further contains peroxide, or sequence superoxide, or ozonid alkali metal in the following ratio, wt.%:

Peroxide, or sequence superoxide,

or ozonid alkali metal 40-94

The chromium oxide is 0.1-5

Aluminum Else

2. Composition under item 1, characterized in that as a peroxide of an alkali metal it contains peroxide sodium.

3. Composition under item 1 or 2, characterized in that it further contains a plasticizer, such as dioctyl is the processing composition to initiate combustion, containing aluminum and chromium oxide, and bringing the composition into contact with an environment containing water, for the implementation of the exothermic reaction, characterized in that the composition for initiating combustion of the use composition according to any one of paragraphs.1-3.

5. The method according to p. 4, characterized in that as an environment for conducting exothermic reactions use water.

6. The method according to p. 4, characterized in that as an environment for conducting exothermic reactions using 5-30% aqueous hydrochloric acid solution.

7. The method according to any of paragraphs.4-6, characterized in that the introduction of the composition into the zone of the processing carried out by placing the composition in a dehydrated hydrocarbon environment.

8. The method according to p. 7, characterized in that the composition in such an environment is placed in a container with insulating membranes, and casting of the composition in contact with the specified environment carried out by feeding the surge pressure sufficient to rupture the membranes.

 

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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.

8 cl

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