RU36855U1 - DEVICE FOR THERMOGASCHEMICAL TREATMENT OF OIL LAYER - Google Patents

Description

Device for thermogasochemical processing of oil flake

The utility model relates to the oil and gas industry, in particular, to devices for thermogas-chemical treatment of an oil reservoir, which can be used to resume the work of new and to activate wells, the productivity of which is reduced due to paraffin-asphalt tar deposits, which disrupt the connection of the well with the fluid-bearing formation.

A number of devices are known for thermogasochemical treatment of an oil reservoir, the basis of which is a charge made of solid fuel materials and which, during their combustion in the wellbore, carry out thermogasochemical treatment of the oil reservoir. Such devices relate to powder pressure generators. The design of the known devices is different, but common to them is: the presence of a charge (case or open) in the form of a checker (one or more) of solid propellant material and an ignitor (RU 2071556 C1, 01/10/1997; RU 2110677 C1, 05/10/1998; RU 2124630 C1, 05/10/1998; RU 2151282 C1, 06/20/2000). The device is installed in the well in the processing interval. An electric current is supplied through the cable to the igniter, from which the charge ignites and burns.

During charge burning, the treated zone of the formation is subjected to the simultaneous mechanical, thermal and physico-chemical effects of the combustion products, which generally leads to an increase in oil and gas production.

.. ..M, Shltyyash

E 21 in 43/25 However, powder generators have a common drawback: they are unsafe in operation and difficult to implement the processing process. The closest technical solution to the claimed utility model is a device for processing wells, containing a cylindrical pipe lowered into the well, which in essence is a two-section reaction chamber, each of the sections of which is filled with reagents, and the volumes of the sections are proportional to the volumes of reactants that enter into the reaction, and each section has a working valve in the lower part, connected by a channel with a mixer, which is placed in a foam chamber having an outlet opening blocked by a vibrato valve rum, providing the opening of the outlet with a given frequency, and in the upper part of the camera is placed the initiating pyrotechnic device (RU 2148162 C1, E 21 V 43/25, 04/27/2000). The known device operates as follows. The pipe - reaction chamber is suspended at the wellhead using an elevator. In this case, all its valves are closed. A chemical reagent is poured into one of the sections - a concentrated solution of ammonium bicarbonate, and into another section a concentrated 36% hydrochloric acid solution. The valve is closed, the upper end of the chamber is sealed, and on the wireline, it is lowered into the well through the casing. Stop the camera in the interval of the reservoir so that the outlet is opposite the treated interval of the filter. They give a current pulse through the cable to open the controlled valve. The latter opens and acid from the compartment begins to pour into another compartment, where the solution of ammonium bicarbonate is located. In this case, a chemical reaction occurs with the release of carbon dioxide. Due to the expansion of the gas in the inner cavity of the reactor creates an excess pressure that exceeds the pressure in the wellbore. If a pyrotechnic initiating device is used, then when a current pulse is applied

the charge ignites and the gas released creates the excess pressure necessary to squeeze the reagents out of the chamber. Under the influence of excess pressure, the valves open and reagents begin to flow through the channels into the mixer, and a chemical reaction occurs with the release of carbon dioxide gas, which leads to the formation of foam, which fills the foam chamber and pours out through the outlet into the wellbore. Under the pressure of the jet pouring from the hole, a vibrator valve is activated, which closes and opens the outlet with a given frequency. As a result, hydraulic pulses are created that act on the formation, under the influence of which the microcracks and pores of the formation expand, the foam from the wellbore penetrates the formation. In the formation, an unreacted acid in the mixer also interacts with the skeleton and the clogging particles of the formation.

For complex wells, treatment is repeated.

A disadvantage of the known device is its limited use (one-time) for processing wells. Low efficiency in the development of viscous oil fields, the impossibility

use for processing aqueous solutions of reactive components having relatively low thermodynamic combustion temperatures (of the order of 1500 K).

The technical result of the claimed model is the creation of a new type of device that allows safe thermogaschemical treatment of the oil reservoir in continuous mode, or in low-frequency pulsations from 0.3 to 3 Hz or in forced short-term mode with a pressure in the reaction chamber up to 55-60 MPa, increase its effectiveness in the development of viscous oil

deposits with the possibility of use for water treatment

solutions of reacting components having relatively low thermodynamic combustion temperatures (of the order of 1500 K).

The technical result is achieved using a device, the circuit diagram of which is presented in FIG.

A device for thermogas-chemical treatment of an oil reservoir includes a flow-through cylindrical reactor 1, divided into at least three horizontal reaction zones, with an internal heat-insulating coating 2, with an accumulating stabilizing unit 3, made in the form of an axisymmetric glass with inlet openings and with a nozzle block 4 in the lower part reactor, a system for supplying components through nozzle assemblies, the number of which corresponds to the number of reaction zones, while the assembly 5, made in the form of a nozzle head, ensures In the first zone, it is structurally connected with the initiating pyrotechnic device 6, the nozzle assemblies 7, which serve to spray the reagents into the subsequent reaction zones, are placed on the main pipe 8 installed in the center of the reactor in the lower part of each of the reaction zones stabilizers 9 are installed, which are a poorly streamlined body in shape; in the lower part of the reactor, on the nozzle block side, a pressure drop is released, cover 10, and the mixing unit of the reagents 11, mounted above the reactor. Technologically connected with it through the main pipe 8 and with the pipe 12 for supplying the reagents to the first reaction zone of the reactor.

The arrows in FIG. shows the direction of receipt of the starting reagents in the reactor.

The device operates as follows.

The device is assembled on the ground, and then lowered through the well casing (not shown in Fig.) Into the formation treatment zone (bottom hole zone, sump, etc.).

in the mixer 11 (mixing unit of the starting reagents) serves aqueous chemically active solutions of the starting reagents, for example ammonium nitrate and ammonium hydrogen phosphate, having a combustion temperature of about 1500K. Then, from the mixer, a certain part of the mixture is fed into the reactor 1 through a pipe 12, which is sprayed through the nozzle head 5 in the first zone, while the rest of the mixture is fed through the main pipe 8 to the nozzle units 7 and which is sprayed in each of the zones of the reactor, simultaneously with the mixture the initiating pyrotechnic device 6 is activated in the first zone and ignites the sprayed mixture. In the case of an unstable process of ignition and combustion in the reactor, the unburned mixture, passing through the entire reactor, accumulates in the storage unit 3 (stagnant zone of the reactor) and, due to the increased residence time, self-ignites, stabilizing the main process in the reactor. As the pressure in the reactor increases due to the combustion of the mixture components and the release of a large amount of gaseous interaction products, the nozzle cover 10 is released and the combustion products expire through the nozzle assembly 4, which penetrate into the treated zone of the oil reservoir. Under the influence of gaseous products, microcracks and pores of the formation expand, and the paraffin-asphalt-resinous deposits that clog the formation dissolve.

Ultimately, the productivity of the well increases.

Claims (1)

A device for thermogasochemical treatment of an oil reservoir, comprising a cylindrical reaction chamber, a knot for mixing the starting reagents, and an initiating pyrotechnic device, characterized in that the reaction chamber, made in the form of a flow reactor, divided into at least three reaction zones with an internal heat-insulating coating, contains cumulative stabilizing unit, made in the form of an axisymmetric cup with inlet openings and with a nozzle block in the lower part of the reactor, supply system and components through nozzle units, the number of which corresponds to the number of reaction zones, while the unit installed at the inlet of the reactor, made in the form of a nozzle head, provides the initial atomization of the initial reaction mixture in the first zone and is structurally connected with the initiating pyrotechnic device, nozzle units serving for spraying reagents into subsequent reaction zones, are placed on a main pipe installed in the center of the reactor and passing through the nozzle unit of the first zone, in the lower part of each In the reaction zones, stabilizers are installed, which are in the form of a poorly streamlined body, in the lower part of the reactor, on the nozzle block side, a pressure drop, a cover is installed, and the mixing unit of the initial reagents installed above the reactor is technologically connected to it through the main pipe and with the supply pipe reagents in the first reaction zone of the reactor.