RU2566852C1 - Device for bench testing of solid propellant charges - Google Patents

Abstract

FIELD: test hardware.

SUBSTANCE: claimed device comprises vertical sealed cylindrical case with detachable top cover to support electric conductor and compressed inert gas feed union (up to 12 MPa). The cover has at least two pressure release safety valves and solid propellant support bracket. Besides, the device case houses at least two types of transducers to measure pressure and temperature inside the device and to measure temperature and vibration of the walls. Note here that multichannel parameter measurement and processing system is used to collect the data from the transducers.

EFFECT: increased data content of tests.

2 dwg

Description

The invention allows bench testing of charges of powder pressure generators (such as PGDA, PGD.BK, ZGRP, etc.) designed for thermogaschemical processing and gas-dynamic fracture of oil and gas and coal seams in conditions close to real, with the registration of pressure and temperature in the device, vibration and the wall temperature of the device, the burning rate of the fuel at high pressures.

The invention relates to the field of rocket technology, and more particularly to the field of testing and testing of solid fuel charges and devices for thermogas-chemical treatment and gas-dynamic fracturing of oil and gas and coal seams.

A well-known experimental installation for bench testing of gas generators used to break oil-bearing formations [1], consisting of a housing made in the form of a perforated pipe with a tightly closed lower part, in the upper part of the housing there is a plug in which there are slots for installing a sensor, an ignition plug and gas vents. At the end of this plug there is a thread for attaching the test gas generator. Openings with silencers are made on the side surface of the body, which simulate perforated holes in the well casing.

The disadvantages of the known installation is that it does not provide the possibility of studying the combustion of generators in which the ignition is not on the central channel, for example, on the side surface of the charge, as well as the limited combustion characteristics obtained (the installation only measures one parameter - pressure in the combustion chamber) .

The closest in technical essence and design features (but not in the achieved effect) seems to be the installation that simulates the well conditions described in [2]. The installation is an elongated cylindrical pressure vessel (up to 80 MPa), filled to a certain level with water and sealed with a removable cover. The initial pressure in the vessel is created by supplying compressed gas (up to 12 MPa) from the standard cylinder through the nozzle to the space between the water level of 30-100 mm and the vessel cover. By adjusting the height of the gas space, a predetermined value of the maximum pressure in the vessel is achieved when testing the prototype of the device. On the lid of the vessel there is a safety valve to relieve pressure that exceeds the permissible limit, and an electric wire to the electrical circuit of the device is also located. A sensor for measuring pressure is placed in the vessel body.

A disadvantage of the known device is the limited scope of work on this installation with model charges only, as well as the limited combustion characteristics obtained (only the pressure in the combustion chamber can be measured).

The task was to create a device for studying underwater combustion of full-sized charges of solid fuel with the ability to record the pressure and temperature in the combustion chamber, vibration and temperature of the wall of the combustion chamber, the burning rate under conditions close to the borehole.

This object is achieved in that the device for testing charges of solid fuels contains a sealed cylindrical body 1 with flanges at the edges, which is attached to the metal base 2 with the lower flange, and a removable cover 3 is mounted on the upper flange, on which the fitting 4 is welded for supply to the combustion chamber compressed inert gas from the cylinder 5 through the high pressure valve 6 and the non-return valve 7. There are at least two safety valves 8 on the cover to relieve pressure, an electric wire 9 is placed to the device’s electrical circuit , and there is also an arm 10 for suspending the charge of solid fuel 11. In the device’s body there are sensors (at least two of each type) for measuring pressure 12 and temperature 13 inside the case, temperature 14 and vibration 15 of the case walls. To collect information from sensors, a multichannel system of measurements, parameter processing and control of stand 16 is used.

The invention is illustrated by drawings, where in FIG. 1 shows a General view of the device in section; in FIG. 2 shows a top cover in section.

Work on the proposed device is as follows.

Before testing on the bracket 10 suspend a charge of solid fuel 11 with an igniter installed in it. After connecting the wires from the igniter to the lower contacts of the electrode 9, the connection points are isolated. Case 1 is half filled with water. After that, the charge is lowered into the housing, add water inside the housing to the level of the upper flange, install the cover 3 in place and fix it with bolts. Then, the initial pressure in the device is created by supplying up to 12 MPa of compressed inert gas (for example, nitrogen) through the nozzle 4 from a standard cylinder into the space between the water level and cover 3; the test conditions can be changed by adjusting the water level in the housing.

The test process in this case proceeds as follows.

At the beginning of combustion, the pressure in the housing begins to increase, when it exceeds the pressure set on the safety valves, excessive pressure is released by ejecting a mixture of inert gas, vapors, and combustion products through valve 8. When the test ends, the remaining pressure in the housing is reduced to atmospheric by forcing the safety valve to open.

In the process of testing the sensors record the change in pressure, temperature and vibration, then these data determine the burning time and the corresponding average pressure.

Thus, the present invention will make it possible to test full-sized charges of solid fuel with the ability to record pressure and temperature in the well, vibration and temperature of the wall of the well, burning rate in conditions close to the borehole.

Information sources

1. Barsukov V.D., Minkova N.P., Minkov S.L. An experimental setup for bench testing of gas generators used in fracturing oil fields / News of higher educational institutions. Oil and gas. Tomsk: 1990. - No. 12.

2. RF patent №2114984, MKI 6 E21B 43/117, E21B 43/25, 1996. "Device for opening and processing the bottom-hole zone of the well." Publ. 07/10/1998 - a prototype.

Claims (1)

A device for working off charges and devices intended for thermogas-chemical treatment and gas-dynamic fracturing of oil and gas and coal seams, including a vertically mounted sealed cylindrical body with a removable top cover, on which an electric wire and a fitting for supplying compressed inert gas (up to 12 MPa), differing the fact that there are at least two safety valves on the cover for pressure relief, an arm for suspending the charge of solid fuel, in addition, in the housing of the device Sensors are placed (at least two of each type) for measuring pressure and temperature inside the device, as well as temperature and wall vibration, and a multi-channel system for measuring and processing parameters is used to collect information from sensors.

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