RU95027U1 - BOTTOM-BASED STEAM GAS GENERATOR ON MONOFUEL - Google Patents

Abstract

 A mono-fuel downhole gas and gas generator, including an electric heater, a starting and main combustion chamber, a chamber for mixing combustion products with water and nozzles located in the main chamber, characterized in that the nozzles are located along the entire length of the main chamber, and the starting and main combustion chambers are insulated.

Description

The utility model relates to the oil industry, and in particular to devices generating a vapor-gas mixture directly at the bottom.

Known combined-cycle plant, consisting of channels for introducing air, fuel mixture and water, fuel nozzle, ignition unit and combustion chamber.

To protect the wall of the combustion chamber from high temperatures, in its upper part there are tangential channels for water inlet, inclined relative to the axis of the device, and a number of water discharge sectors are installed along its length on the inner wall. An output nozzle is installed in the lower part of the combustion chamber (AS No. 899872).

Downhole steam and gas generator has the following disadvantages:

- the design of the known fuel nozzle with an ignition spark assembly does not provide reliable multiple start-up of a steam and gas generator while supplying simultaneously the operating costs of air, fuel and water;

- the flow of water directly into the combustion zone leads to a decrease in temperature in the parietal layer, which leads to soot formation;

- the stability of the liquid film can be achieved by tangential openings of a sufficiently small diameter, which, in turn, depending on the quality of the supplied water, can lead to their clogging, overheating of the wall of the combustion chamber, and exit from the operating state of the steam and gas generator.

The closest in technical solution is a downhole steam and gas generator, which we selected as a prototype, including a starting and main combustion chamber, a chamber for mixing combustion products with water, an electric heater and nozzles located in the upper part of the main chamber. (RF patent No. 2316648).

The disadvantages of this downhole steam and gas generator are:

- The use of hydrocarbon fuel requires the use of compressor equipment for supplying high pressure air to a steam and gas generator.

- Lack of thermal insulation of the combustion chamber leads to additional heat loss and the possibility of heating the fluid around the steam and gas generator.

- The possibility of the formation in the combustion products of soot polluting the bottomhole formation zone.

The technical result of the utility model is the creation of a device for producing a gas-vapor mixture at the bottom of a well using mono-fuel without separate supply of fuel and an oxidizing agent to a gas-vapor generator (PGG).

The technical result is achieved by the fact that a downhole steam and gas generator on monofuel including an electric heater, a starting and main combustion chamber, a chamber for mixing combustion products with water and nozzles located in the main chamber, according to a useful model of the nozzle are located along the entire length of the main chamber, and the starting and main combustion chambers have thermal insulation.

The location of the fuel supply nozzles along the entire length of the main combustion chamber allows to increase the productivity of a steam and gas generator by increasing the consumption of mono-fuel and to ensure complete decomposition of the mono-fuel by adding to the supplied mono-fuel the combustible reaction products from the previous stages.

The presence of thermal insulation of the starting and main combustion chambers allows to reduce heat loss to the environment and to prevent the design of the steam and gas generator from overheating.

In FIG. a drawing of a bottomhole steam generator on mono-fuel is presented.

The steam and gas generator consists of a starting (1) and main (2) combustion chambers and a mixing chamber (3) located in a single tubular casing (4). Combustion chambers (1 and 2) have thermal insulation (5). Monofuel is fed into the launch chamber through the nozzle (6) and nozzles (7) located along the entire length of the main chamber (2), and into the main chamber through the nozzles (8, 9), supply lines (10) and nozzles (11). Water is supplied through a pipe (12) and through an annular gap (13) through nozzles (14) it enters the mixing chamber. At the top of the launch chamber, a tubular electric heater (15) is installed.

Steam generator works as follows.

Before starting, the steam and gas generator is filled with mono-fuel through the nozzles (8) and (9), while the air is displaced through the nozzles (7) of the launch chamber (1) and the nozzle (6). After filling the steam and gas generator and displacing the air, the electric heater (15) is turned on. After the start of the decomposition reaction in the launch chamber (1) through the nozzles (7), the supply of monofuel begins. Hot decomposition products from the starting chamber (1) passing through the main chamber (2) heat it to the temperature necessary to start the decomposition of the monofuel. Upon reaching the required temperature in the main combustion chamber (2) through the supply line (10) and nozzle (11), the main flow of monofuel begins. To obtain steam of the required temperature, water is supplied through the nozzle (12) along the annular gap 13 formed by the tubular body (4) and thermal insulation (5), which is injected through nozzles (14) into the mixing chamber (3), where it is mixed with products decomposition of monofuel and the formation of gas and vapor.

Claims (1)

A bottom-hole steam and gas generator based on monofuel, including an electric heater, a starting and main combustion chamber, a chamber for mixing combustion products with water and nozzles located in the main chamber, characterized in that the nozzles are located along the entire length of the main chamber, and the starting and main combustion chambers are insulated.