RU1795074C - Rock-cutting tool with airlift flushing - Google Patents

Abstract

Usage: drilling airlift-flushed wells. Summary of the invention: the device comprises a double pipe string with a mixer and a rock cutting tool with a pipe connected to the double pipe string with an internal slurry pipe. A cavitation oscillation generator is installed above the slurry pipe. Between the mixer and the cavitation oscillator placed shock absorber-reflector, 1 z.p. f-ly, 1 silt. with C

Description

The invention relates to the field of drilling technology, and in particular to airlift-flushing drilling tools.

A well is known for drilling a well with aerated fluid, including a drill string, a sludge collection tank mounted above the rock cutting tool, and a valve system for controlling the flow of flushing fluid into the drill string.

The disadvantage of this projectile is the difficulty in regulating the amount of fluid supplied to the drill string, which negatively affects the cleaning of the mud slurry and, as a consequence, the drilling productivity.

Closest to the proposed technical essence and the achieved result is a shell for drilling with flushing the borehole airlift containing

a double pipe string with mixer and a rock cutting tool with a pipe connected to the double pipe string by means of an internal slurry pipe.

The disadvantage of this projectile is its lack of efficiency due to the fact that said projectile ensures the operation of the rock cutting tool in cutting, micro-cutting mode (in the case of using crowns), or chipping and crushing (in the case of cone bits).

The aim of the invention is to increase the efficiency of a drill by reducing the energy consumption of the rock destruction process.

The goal is achieved by the fact that a shell for drilling wells with airlift flushing, containing a double pipe string with a mixer and rock cutting tool

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with a pipe connected to the double pipe string by means of an internal slurry pipe, according to the invention, it is equipped with a cavitation oscillator mounted on an upward flow above the slurry pipe, and a shock absorber-reflector located between the mixer and the cavitation oscillator, while the “natural oscillation frequency” parts of the equipment located below the shock absorber-reflector is a multiple of the oscillation frequency generated by the cavitation generator.

The drawing shows a General view of the device.

The tool includes a double drill string 1 with a mixer 2, a shock absorber-reflector 3 mounted on the lower end of the drill string 1 and connected to a cavitation oscillation generator 4. The latter is rigidly connected to the pipe 6 by the internal slurry pipe 5, the upper end of which is located in the cavity a slurry pipe 5, forming a chamber for collecting coarse particles, and the lower end is connected to a sandblasting tool 7. Moreover, the section of the drill string located below the shock absorber-reflector 3, including rock-breaking The instrument 7 .obrazuet resonance system (resonator) with a certain frequency oscillations poddayuscheys adjusted by changing both the length of this section and its layout.

Snar q works as follows.

Compressed air supplied from the compressor through the annulus of the double drill pipe 1 to the mixer 2, aerates the fluid inside the double drill pipe, reducing its density. Due to this, a pressure difference is formed between the liquid column in the borehole on the one hand and the internal cavity of the drill pipe on the other hand. As a result, in a rock cutting tool

7, a slurry pipe 5, a cavitation generator 4 and a pipe 6, a flow occurs from the borehole space into the internal cavity of the double drill

pipes 1, where it is constantly aerated and enters the surface in the form of aerated pulp.

In this case, the cleaning agent, washing and cooling the working elements of the rock cutting tool 7, is enriched with drill cuttings and enters through the pipe b into the closed sludge pipe 5, where large sludge is deposited. Then the agent enters

cavitation oscillation generator 4, where due to the periodically disruptive cavitation mode, part of the hydraulic energy is converted into longitudinal vibrations of the drill string section between the bottom and

shock absorber 3. Moreover, the natural frequency of the drill string section from the shock absorber 3 to the rock cutting tool 7, including the latter, is selected to be a multiple of the oscillation frequency generated by the cavitation generator 4. This increases the specific impact energy, which is of particular importance when washing fluid is lost. Increasing the impact energy contributes to increased efficiency

destruction of the rock by reducing the energy intensity of the process of its destruction.

The longitudinal vibrations of the resonant system resulting from the operation of the projectile are damped by a shock absorber-reflector 3, which dampens the longitudinal vibrations directed towards the double drill string and prevents it from destruction.

Application of the proposed shell yes

provides an increase in the mechanical speed of drilling and sinking due to the creation of shock loads and improved cleaning of the bottom of the sludge due to the additional grinding of the core material cavitation

generator.

 The formula of the invention

Claims (2)

1. An airlift drilling tool comprising a double column of pipes with a mixer and a rock cutting tool with a nozzle connected to the double column of pipes with an internal slurry pipe, characterized in that, in order to increase its efficiency by reducing the energy consumption of the rock destruction process It is equipped with a cavitation oscillator installed above the slurry pipe and a shock absorber-reflector located between the mixer and the cavitation oscillator. 2. The projectile according to claim 1, characterized in that the frequency of oscillations generated by the cavitation generator is a multiple of the natural frequency of the part of the projectile located below the shock absorber-reflector.