SU1032837A1 - Device for thermomechanical drilling of boreholes - Google Patents

Abstract

1. DEVICE FOR DRILLING WELLS high-temperature thermomechanical gazoabrazivnySh1-jet MHj wherein the combustion chamber has a nozzle passages expiration gaize abrasive particle acceleration chamber communicating with the space through the lateral wellbore window for ejecting them from the waste gas stream, characterized in that, with In order to increase the drilling efficiency by improving the circulation of abrasive particles, the combustion chamber and the acceleration chamber are installed coaxially, and the connecting nozzle channels are made in the inner The touch the wall of the combustion chamber. 2. A device according to claim 1, characterized in that the nozzle channels are made tangentially to the axis of the acceleration chamber.

Description

The invention relates to a device for thermomechanical drilling of wells with high-temperature gas-abrasive jets and can be used for drilling, mainly, imprinted wells in hard rocks. A device for thermomechanical drilling of wells is known, having a combustion chamber with a nozzle opening to discharge the combustion products to the bottom, and a mixing chamber where the combustion gases are mixed with the exhaust gas stream including abrasive solids ejected from the well space through the side openings in the device body . During operation of the known device, abrasive particles in the course of circulation along the trajectory of the mixing chamber — bottomhole — the peripheral part of the well — the mixing chamber is constantly subjected to heating and for this reason acquire plasticity. As a result, an inelastic collision of the abrasive particles with the face takes place and the efficiency of its destruction decreases. The closest technical solution of limestone to the invention is a device for thermomechanical drilling of high-temperature gas-abrasive jets in which the combustion chamber has nozzle channels for the outflow of gas into the chamber of the acceleration of abrasive particles, communicating with the space of the well through side windows for ejecting them from exhaust gas flow. This device provides channels for supplying coolant: waiting water, the outlets of which are located in the lower part of the acceleration chamber so that the abrasive Particles rising in the gas flow pass through the water curtain and cool, rubbing their plastic properties. However, the efficiency of the circulation of abrasive particles in this device is not large enough due to the fact that in it the difference in cross sections of the combustion chamber and the acceleration chamber is not enough; 1 and it is not possible to reduce the speed of the outgoing flow in proper

to a measure at the location of the ejection windows, since the decrease in the velocity of the exhaust gas flow is determined. Under the influence of the aerodynamic force of the gas flow of the combustion products, the particles 14 are removed from the surface by precisely the difference of the said sections. The purpose of the invention is to increase the drilling efficiency by improving the circulation of the abrasive particles. This goal is achieved by a device for thermomechanical drilling of wells with high-temperature gas-abrasive jets, in which the combustion chamber has nozzle channels for the outflow of gas into the opening chamber of the abrasive particles, which communicates with the well space through the side openings to eject them from the outgoing gas flow. According to the invention, the combustion chamber and the acceleration chamber are mounted coaxially, and the nozzle channels connecting them are made in the inner side wall of the combustion chamber. In addition, the nozzle channels are made tangentially to the axis of the acceleration chamber. The drawing shows the proposed device, a longitudinal section. The device for thermomechanical drilling of wells has a housing 1 in which a combustion chamber 2 with nozzle channels 3 and an acceleration chamber 4 arranged coaxially and also channels 5 for a cooling agent are provided. The gaseous oxidizer (compressed air) is supplied to the combustion chamber 2 via line 6 via a swirler 7. The liquid fuel line 8 (kerosene) is provided at the outlet with a nozzle 9 for its distribution. The housing 1 is attached to the drill (the rod 10 by means of connecting ribs 11 between KOTopbnvffl are ejecting windows 12. The combustion chamber 2 due to the placement in the dimensions of the chamber 4 of the acceleration of abrasive particles in cross section has a ring-shaped form, and the nozzle channels 3 are made in its inner wall tangentially to the axes of the acceleration chamber 4. The device operates as follows: Combustion products through nozzle channels 3 from the combustion chamber 2 expire into the acceleration chamber 4 and form in it a rotating gas flow directed toward the side 13 sec. The portions of the abrasive particles 14 preliminarily fall asleep at the bottom 13.

310328374

the bottom 13 rises along the peripheral implementation of the chamber 4 brazivnyh

parts 15 of the well and through the windows of 12 parts in the dimensions of chamber 2 combustion

The mezvdu connecting ribs 11 vvo-allows to reduce the cross-section in the camera 4 acceleration. In the last-5 ® device above its body 1,

in it, particles 14 are accelerated to the extent that ultimately leads to

for the destruction of the speed of circulation efficiency

allowing them to deviate from reducing the speed of the waste of a well. The following describes the cycle of a continuous gas flow in the zone

Repetitively repeats. Window 12.

Claims (2)

1. DEVICE FOR THERMOMECHANICAL DRILLING OF WELLS with high-temperature gas-abrasive · jets, in which the combustion chamber has nozzle channels for the outflow of drain into the acceleration chamber of abrasive particles, communicating with the space of the well through side windows for ejecting them from the exhaust gas stream, characterized in that, for the purpose increase drilling efficiency by improving the circulation of abrasive particles, the combustion chamber and the acceleration chamber are installed coaxially, and the nozzle channels connecting them are made in the inner side howling wall of the combustion chamber. 2. The device pop. 1, characterized in that the nozzle channels are tangential to the axis of the acceleration chamber.