SU1058343A1 - Device for electric explosive treatment of seam - Google Patents

Abstract

A DEVICE FOR ELECTRIC EXPLOSION PROCESSING OF A PLASTE containing an electric discharge with capacitors and electrodes characterized in that. that, in order to increase processing efficiency by creating cavitation waves in the interval being processed, it is provided with elastic shells filled with gas and limiting the discharge gap.

Description

The invention retards to malicious physical devices and systems for treating 9Lats and can be used for electrofusion processing of objects under the liquid, for example, in deep wells with their wells, to restore exploitation parameters.

A device is known for affecting the wellbore zone, the enclosure with the discharge electrode spacing of the electrode spacing, the cable-tube and the generator of current pulses.

However, the disadvantage of the known device is the low efficiency of the operation due to the fact that the condition and the reproduction and development of the electric explosion under high hydrostatic pressure are not taken into account.

The closest is a device for electro-blasting treatment of the formation, which holds the discharge electrode with condensers and electrodes.

However, the specified device practically does not take into account the specific conditions of reproduction and the development of an electric explosion under high hydrostatic pressure, increasing with depth, associated with a sharp decrease in the effect of a pulsing after discharge.

00 Sl) | S cavities and, accordingly, secondary compression waves.

Thus, the overall energy conversion efficiency of such a device is very low, to the extent that the device is not operational.

The aim of the invention is to increase the efficiency of well treatment by creating cavitation waves in the treated interval.

The goal is achieved by those. A MIS device for electro-blasting treatment of the formation containing an electric discharger with capacitors and electrodes is provided with elastic shells filled with gas and limiting the discharge gap.

Figure 1 is given a device, a longitudinal section; figure 2 - section aa in figure 1.

The device consists of a housing 1, inside which a rectifier-transformer 2 is placed, a block of impulse drives 3, a switching device 4, an electric rod 5, an electrode-plane 6, mounted on a base 7 connected through stiffening ribs 8 to the housing 1, elastic shells 9, filled with gas and equipped with a pressurization system 10 to maintain the back pressure during immersion and a pressure relief system 11, which is activated when the device mounted on the cable 12 is lifted, the electromagnet valve 13 and the tube 14 for supplying gas to the bottom th shell.

The device works as follows.

a) When the device is lowered into a well with a fluid density of 0.85 t / m / F, the distance between the electrodes, mm, is established. This distance is chosen from the condition of obtaining in the compression wave of the near zone a discharge in a liquid of maximum pressure Pm, depending on the density of the liquid / OF, the geometric characteristics of the electric discharge channel (CER), and the duration of the discharge. The pressure value is estimated from the expression

2

Where

a g11: 1111g2Zh.1L yfp p J

y is an effective indicator of adiabat of plasma of KER,

from 1.26:

g - the duration of the discharge;

W is the energy introduced into the discharge.

b) A device mounted on the cable-cable 12 is lowered into the well to a predetermined depth with the pressurization system 10 turned on. At that, the gas under pressure in the cavity of the pressurization system 10 enters the elastic shells 9 through the electromagnetic valve 13, and the gas supply in the lower shell is produced by tube

14, fixed to stiffener B. When the shells 9 are filled, the valve closes automatically.

The elastic shells 9 are filled with gas, thus isolating the work area. After applying voltage through cable-cable 12, converting it into a rectifier transformer 2, charging a block of impulse drives 3 and activating

KOMMyi of the measuring device 4 between the electrodes 5 and 6, an electrical discharge occurs. The shock wave of an electric explosion propagates in the insulated shells 9 of the working zone. Reaching the gas-liquid interface, it is reflected in the form of a rarefaction wave, behind the front of which the pressure almost immediately disappears, and during 50-70 microseconds the volume cavitation covers the entire thickness of the liquid.

Since there are always various phase inclusions in the well fluid filling the well, they are cavitation nuclei. When the cavitation bubbles collapse, pressure waves with an amplitude of up to 1-10 MPa and cumulative jets of liquid are produced in the volume, which perform the work of destroying undesirable deposits, for example, on the walls of the well.

If necessary, a pressure relief system must be turned on in the shells 9.

The use of the proposed device allows to increase the efficiency of well treatment by applying a new

structural element - elastic shells filled with gas, limiting the discharge gap; to simplify the design due to the absence of a separate source of excitation of cavitation. By

improving device performance will reduce energy loss by 45%, reducing the time required to recover well performance.

Based on this, the economic effect when using the proposed device will be approximately 75 thousand rubles. on one well.

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Claims (1)

A PLASTIC ELECTRIC TREATMENT DEVICE, containing an electric discharger with capacitors and electrodes, characterized in that, in order to increase processing efficiency by creating cavitation waves in the treated interval, it is provided with elastic shells filled with gas and limiting the discharge gap. ^and