SU762476A1 - Device for thermomechanical drilling of boreholes - Google Patents

Description

The invention relates to devices for thermomechanical drilling of wells and their simultaneous expansion by exposing the rock to a high-temperature gas jet and roller cone tool.

A device for thermomechanical drilling and expansion of wells, containing a combustion chamber placed in a housing and communicated with fuel and oxidizer supply lines and equipped with a side nozzle, and a roller rock cutting tool, has a channel for supplying a gaseous oxidant to the wellbore part of the well to clean it from drilling slime, In this case, fuel is burned in the combustion chamber with an oxidizer excess ratio of less than one, and the resulting combustion products are transferred into the well space above tools ment for afterburning in the effluent stream of spent oxidant.

Thanks to this design of the device, it is possible to increase the efficiency of the well expansion process while drilling it.

. However, in this case, the drilling process is carried out only with the help of a mechanical tool, which reduces the effectiveness of the drilling of a well.

The closest technical solution to the invention is a device for thermomechanical drilling of wells, which contains a central nozzle placed in the housing and communicated with the supply lines of the fuel and oxidizer and a roller rock cutting tool connected to the housing and having channels for blowing the roller cones.

With the help of a known device, a thermomechanical impact on the bottom of a well is provided and to obtain the required diameter of the well, its subsequent expansion is necessary, which is not always cost-effective and is associated with additional time costs.

The purpose of the invention is to increase the efficiency of the combined process of drilling and expanding a well.

The goal is achieved by the fact that the channels for purging the supports

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communicated through the throttle element with highways supplying fuel and oxidant.

The drawing shows the device 5 for thermomechanical drilling

wells.

In case 1, which is connected to the drilling mill, there is a combustion chamber 2 with a central nozzle 3, which is connected to the fuel and oxidizer supply lines 4 and 5, respectively. To disperse the fuel in ka ₇ measure 2 combustion nozzle 6 is installed, connected to the main

15 4, and in the top cover 7 of the camera 2

Combustion channels 8 are made for the passage of oxidizer into it.

In housing 1, channels 9 and 10 are provided for the passage of fuel and oxidizer, respectively, whose inputs through chokes 11 and 12 are connected respectively to lines 4 and 5 for supplying fuel and oxidizer, and outputs through a collector 13 communicate with channels 14 to purge supports 15 a roller tool 16, which is connected to the housing 1 by a threaded shank 17.

The device works as follows.

30 way.

Combustion and oxidant are fed to the combustion chamber 2, which are mixed and form a fuel mixture that is ignited by means of a hardened candle. Then, the combustion chamber 2 is brought to the operating mode with an oxidizer excess ratio of close to 1.0. In operation mode on channels 9 and 10 through chokes 11 and 12

4 _0, fuel and oxidant are supplied to the collector 13, where they mix and form a fuel mixture that enters through the channels 14 and gaps in the bearings of the supports 15 in the space in the well.

In the space of the well in the presence of a central torch flowing from the nozzle 3 of the combustion chamber 2, the fuel mixture is burned,

₅ θ discharged through the channels 14 of the tool 16.

Thus, the well is drilled by tool 16 with the weakening of the bottom by a high-temperature jet of gas while simultaneously expanding the well by burning the fuel mixture in its peripheral part. High temperature

3 762476 ⁴

gas jet ustroy- proposed in my fuel mixture and serves as a constant sledovatelstve used but enhances combustion effektochnika that provides ciency combined process buustoychivy combustion process podavav- ₅ rhenium and reaming.

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Claims (1)

A DEVICE FOR THERMOMECHANICAL DRILLING OF WELLS, containing a central nozzle placed in the housing and communicated with the supply lines of the fuel and oxidizer and a roller rock-breaking tool connected to the housing and having channels for blowing the supports carrying the cones, which are different in that with the aim of improving efficiency combined process of drilling and expansion of the well, channels for purging the supports are communicated through the throttle elements with highways supplying fuel and oxidizer. 58 Yu <1 05 one