SU1758203A1 - Downhole hydraulic hammer drill - Google Patents

Abstract

Usage: improving the quality of the core material in the hydropercussion column drilling intensively fractured and crushed rocks. SUMMARY OF THE INVENTION: The projectile comprises a water hammer, an upper adapter with a nozzle, a diffuser, and a lower adapter. An elastically deformable element is installed between the nozzle and the diffuser. The natural frequency of the elastic element is 3-4 times greater than the frequency of forced vibrations of the hydraulic hammer. Circulation and ejector channels are made in the lower adapter. The nozzle is installed in the upper adapter with the possibility of axial movement relative to the diffuser. In this case, the ejection process occurs more intensively, which makes it possible to increase the overall performance of the projectile. 2 Il (L S

Description

The invention relates to coring drilling, in particular to projectiles for improving the quality of rock slurry testing during hydraulic percussion drilling of intensely fractured, crushed and intermittent hard rock.

A drilling hydraulic percussion ejector shell is known, consisting of a hydraulic hammer, an upper adapter with a nozzle, a casing, a diffuser, and a lower adapter with a sleeve.

A well-known (prototype) drilling hydraulic impact device consists of an upper adapter, a nozzle, a spacer sleeve, a diffuser and a lower adapter with circulation and ejector channels. The well-known projectile when working with a water hammer provides an increase in routine penetration due to the imposition of shock pulses and vibrations (reduction in force

friction of rock pieces together and rock adhesion to metal).

The purpose of the invention is to increase the efficiency of the projectile.

This goal is achieved by the fact that the projectile is provided with a cylindrical spacer with radial windows, and the nozzle is installed in the upper adapter with the possibility of axial movement and interaction with the upper end of the spacer sleeve, while the spacer sleeve is spring-loaded with a diffuser, 4 times the frequency of the forced vibrations of the hydraulic hammer and the force of the spring preload is chosen in accordance with the expression

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about

Sl)

Pi 0.39 p p

g 2 L VH. d n.

where p is the nozzle resistance coefficient;

p is the density of the washing liquid; VH is the velocity of the flushing fluid in the flow area of the nozzle at steady state; „„

dn is the outer diameter of the nozzle. FIG. 1 shows the proposed drilling hydraulic shock ejector; FIG. 2 is a section A-A in FIG. one.

The rig contains a hydraulic hammer 1, an upper adapter 2 JT With which a nozzle 3 with an o-ring 4 is placed, a spacer 5, an elastically deformable element 6 (for example, a spring), an adjusting washer 7, a diffuser 8, a housing 9, a lower adapter 10 with circulating a and ejector b channels, and a slurry pipe 11, a receiving chamber formed by the inner surface of the housing 9 and the outer surfaces of the nozzle 3 and the diffuser 8

The spring 6 with one end rests on the diffuser 8, and the other presses the spacer sleeve 5 and the nozzle 3 to the upper adapter. The pre-pressure force Pf is adjusted by the washers 7.

Drilling hydraulic percussion sludge d works as follows.

After the projectile is lowered into the well, drilling fluid is pumped into it through the drill pipe, which freely passes through the hydraulic hammer 1, upper adapter 2, and nozzle 3.

Due to the outflow of the washing liquid from the nozzle 3, the liquid from the receiving chamber and through the ejector channels b from the slurry 11 and the core pipe into the diffuser 8 is sucked in at high speed, in which the two flows are displaced and the kinetic energy of the movement is converted into pressure energy,

The process of ejection occurs in a stationary mode, since the flow rate of flushing fluid is constant over time and is equal to the flow rate of the mud pump Nozzle 3 is preloaded by a spring b to the upper adapter 2 by a preload force, the value of which is greater than the resulting pressure force acting on the nozzle 3. When setting the projectile to the bottom, including rotation application of axial load, the process of drilling begins. In this case, the hydroblower 1 is turned on and the active jet current becomes cyclically intermittently pulsating, corresponding to the work cycle of the hydroblower,

With an increase in the instantaneous flow rate above the nominal (movement of the striker and valve of the hydraulic hammer 1 together downwards and the moment of striking the striker from the valve), the resulting pressure forces acting on the nozzle 3 become greater than the spring force 6 and the nozzle 3 moves downward, compressing the spring 6, until it stops at the end diffuser 8 The discharge of liquid into the receiving chamber is extremely reduced or completely absent. Intense acceleration of the flushing fluid occurs in the annulus, in the ejector and circulation channels.

When the instantaneous flow rate of flushing fluid changes from nominal to zero (the hammer of the hydraulic hammer moves upwards, meets the valve, shutting off the flow), the nozzle 3 is pressed by the force of the spring 6 to the upper adapter 2.

Consequently, the ejection process is more intense, the amount of fluid drawn in and the cycle ejection coefficient of this projecter is higher than that of the ordinary one, due to the prevention of active fluid in the receiving chamber and more intensive acceleration of the fluid in the diffuser and ejector channels (inertial effect). is cyclically with the frequency of forced oscillations of a hydraulic shock hammer. Therefore, in order for this oscillatory system not to resonate, the natural frequency of the spring 6 must be 3-4 times higher than the frequency of oscillation hammers

The proposed design of a hydraulic percussion ejector shell allows to increase the efficiency of the jet pump and the entire projectile as a whole, to improve the cleaning of the bottom and core pipe from sludge particles. Moreover, with an increase in viscosity and density of the washing liquid, the positive effect of inertial processes on the ejection process and, consequently, on the efficiency of the projectile effect increases,

Claims (1)

Invention Formula A drilling hydraulic shock ejector shell containing a hydraulic hammer and a cylindrical hollow body with an upper one connected to the hydraulic hammer and lower adapters, a nozzle and a diffuser placed between the adapters, characterized in that, in order to increase the work efficiency, the projectile is provided with a cylindrical expansion sleeve with radial Windows and the nozzle is installed in the upper adapter with the possibility of axial movement and interaction with the upper end of the spacer sleeve, while the spacer sleeve is spring-loaded relative to the diffuser a, and the natural frequency of oscillation of the spring is 3-4 times more than the frequency of forced oscillations of the hydraulic hammer and the force of pre-pressing the spring is chosen in accordance with the expression V2h d2H, P 0.39 ptt.p where 9 is the nozzle resistance coefficient; p is the density of the washing liquid; VH is the velocity of the flushing fluid in the flow area of the nozzle at steady state; dH - outer diameter of the nozzle. eleven dtet