SU1222822A1 - Deep-well steam-and gas-generator - Google Patents

Description

The invention relates to the oil industry, and specifically to devices that generate a vapor-gas mixture and intended for operation directly in an oil well.

The purpose of the invention is to increase the reliability of the device at startup and ensure the stability of the combustion process.

The drawing shows a general diagram of a downhole steam-gas generator with a gas ignition ignition unit.

A downhole steam and gas generator consists of a combustion chamber 1 with an output nozzle 2. In the upper part of the combustion chamber 1, an ignition device is installed, which includes a receiver 3, a tuning chamber 4 and a resonating element 5. All of these elements are arranged in series and coaxially. The resonant element is 5 j-yen and the shape of a tube is variable with a tapered and cylindrical tube.

Plots. A three-chamber chamber 4, with which the required distance Lp, 6 is established between the outlet section of the nozzle 6, the Laval receiver 3 and the resonating element 5 has holes 7 on the side surface that connect the internal cavity

tuning chamber 4 with supra-packer gatrubny well space ,. which is formed by the casing 8 and the air supply pipe 9 is located above the heat-insulating pack 10. The receiver 3 has two outlet openings, made in the form of a Laval nozzle 6 with an area of minimum cross-section F, and an inlet that is equipped with a replaceable expendable washer 11 F. Receiver 3 has calming partitions and grids 12 for leveling the pressure field in front of the outlet nozzles 6 of receiver 3. Resonating element 5 is installed in pipe 13 for supplying fuel with radial holes 14 for air inlet on its side surface. The air entering the steam-gas generator through the pipe 9 for supplying air enters the combustion chamber through the opening 14 and the swirler 15, the fuel through the pipe 13 to supply fuel through the collector 16, and the water through the pipe 17.

Heating of the resonating element 5 is acoustic-gas-dynamic in nature and is based on the phenomenon of unsteady interaction of a supersonic jet with an obstacle. Laval nozzle outflow. the flow with supersonic speed and its interaction with the obstacle, which is the conical section of the resonating element, leads to the formation of a disconnected shock wave.

The ejection of gas from the high-pressure region — the internal cavity of the resonator — affects the jet at its base, so that the entire jet with the compression shock system begins to oscillate. It is known that when a shock wave is reflected from a wall near it, an increase in pressure and temperature occurs to the parameters of flow deceleration. However, if the shock wave approaches the wall rapidly, due to the oscillatory state of the entire system, the pressure and temperature increase due to the energy of the whole flow occurs in a small volume adjacent to

so that the temperature in this region acquires a value many times greater than the stagnation temperature.

Wall of the resonating element

acts as a heat accumulator, therefore it is necessary that its heat capacity be as large as possible, and the heat conductivity to reduce losses with heat sink as small as possible.

As a result of a sufficiently large number of oscillatory cycles, the resonating element is heated to sufficiently high temperatures, corresponding to the equality of heat flows from the oscillating Strip to the wall and from the wall to the environment.

Well. Parogazogenerator works as follows.

The steam and gas generator is lowered into the well on pipes 9, 13 and 17 and installed in the filter zone with the help of a heat insulating packer 10. Immediately before launching the steam and gas generator, the cavities of the steam and gas generator are blown through the air supply pipe 9. A part of the air necessary for the operation of the ignition device, from the high pressure zone, passes through the expenditure washer 11 to the receiver 3.

By virtue of the fact that the pressure ratio in the air supply line P, and receiver P, is supercritical

In the latter, sedative partitions and grids are installed to obtain a uniform pressure field before entering the supersonic nozzle 6. The air then flows through the supersonic Laval nozzle 6 and the tuning chamber 4 into the cavity of the resonating element 5. From the tuning chamber, the air enters the annular space formed by the casing 8 and the air inlet pipe and connected to the atmosphere. Pressure in This area R.

When a supersonic flow interacts with shock waves reflected from the conical section of the resonating element in the internal cavity, ... of the latter, stable coke pressure banks develop, as a result of which the process stabilizes.

heating of the resonating element to temperatures capable of igniting the fuel. The value of the temperatures obtained depends on the rate of gas outflow from the nozzle 6, the ratio of pressures in the cavities of the receiver P and the tuning chamber. P, as well as the distance between the outlet section of the nozzle 6 and the entrance to the resonating element 5. The tests carried out show that by choosing the parameters listed above, it is possible to obtain the surface temperature of the resonating element colo-.

The pipe 13 combusts the fuel into the manifold 16 and enters the heat

. 222,822.

that part of the resonating element 5. Air in an amount necessary for the initial ignition enters through the holes 14 also directly to the heated part of the resonating element 5. Thus, in the pipe 13 for fuel supply, the initial ignition of the fuel components occurs, and the rest

10 air through the swirl 15 enters the combustion chamber and ensures complete combustion of the fuel. Water is fed into the combustion chamber through pipe 17 into the cooling cavity, and further along the channels, it enters the combustion chamber. As it comes to the ignition device permanently, there is a constant, sufficiently powerful source of heat in the steam-gas generator.

When operating at different depths, the feed pressure of the components varies. Depending on this, in order to economize the ignition device, a corresponding expenditure washer 11 is installed, which ensures optimum air flow and pressure in the receiver 3. At the same time, the supply pressure P and the pressure in the receiver Pj are related to the area of the expenditure washer F and the minimum cross-section area The nozzle ate as follows:

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Compiled by V. Boriskina Editor V. Petrash Tehred I., Popovich Proofreader M. Maksimishinets

Order 1682/31 Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. 4/5

Branch P1P Patent, Uzhgorod, st. Project, 4

Claims (1)

A downhole gas and gas generator, including a packer, a combustion chamber with an ignition unit and an outlet nozzle, pipes for supplying air, fuel and water, characterized in that, in order to increase its reliability at startup and ensure the stability of the combustion process, the ignition unit is made of sequentially and coaxially mounted receiver with an outlet nozzle 'Laval and an inlet for communicating the inner surface of the receiver with pipes for supplying air, a tuning chamber connected to the overpack annular space Azhinov and the resonating element in the form of interconnected conical tapered portion and a cylindrical portion with a closed bottom, wherein the resonating element 1S is placed in the pipe for supplying Topley · va, which is connected via radial bores with a pipe for supplying air. SU „., 1222822