UA125362C2 - Electrohydropulse borehole device - Google Patents

Abstract

Electrohydropulse borehole device are used to increase the flow rate of oil or gas boreholes, water boreholes, degassing boreholes and increase the injectivity of injection boreholes. Electrohydropulse borehole device contains a surface part. Said surface part includes a power source and a submersible part connected to it by a geophysical cable in the form of a hollow cylindrical body, consisting of separate, hermetically connected parts. There is a pulse current generator and an electrode system in a housing. The central electrode of the electrode system is located in an insulator with a throttle, electrically connected to the pulse current generator. An annular membrane is fixed on the cylindrical housing of the electrode system. The cavity between the housing and the annular membrane is filled with a working fluid. The housing of the electrode system consists of the upper and lower parts, which are interconnected by flexible conductive cables with a diameter of 4 to 5 mm with an outer insulating layer. The throttle is made in the form of a metal sleeve, put on the insulator of the central electrode. Moreover, the lower end part of the central electrode has a replaceable anode connected to the central electrode by Morse cone. The working part of the anode is made in the form of a cut cone. The working s fluid is an aqueous salt solution with a specific electrical conductivity of 0.04 to 0.31 cm/m. The annular membrane is made of a multilayer rubber-fabric material. The present invention provides reliable sealing of the housing of the electrode system, reducing the area of "blind" zones during processing, eliminates the off-axis orientation of the discharge channel and stabilizes the process of ignition of an electric discharge under conditions of high hydrostatic pressures and temperatures. This increases the efficiency of the device, reliability and stability in the treatment of boreholes.

Description

of the electrode system, reducing the area of "blind" zones during processing, non-axial orientation of the discharge channel is excluded and the process of ignition of the electric discharge is stabilized under conditions of high hydrostatic pressures and temperatures, and due to this, the efficiency of the device, its reliability and stability during well treatment increases. as a thing - shi: ny - xx «y KI ki: tya

M and g; | haboiovevnn sia Y in VH Ya r Morocco 14 she E m she nn STO shchi N SE i fay re zh. about us: sha on i neck

SHCHNROHMNI she Sha zu

Battles in OIV

I am HE and WE in school that I am Kk ki

VOK AT ka KAM KM i

EC point SM shi SY

Fig. 2

The invention belongs to electro-hydropulse devices, which are used to increase the flow rate of wells for oil or gas production, water wells, degassing wells and increase the throughput of injection wells, due to cleaning and increasing the permeability of drilling zones.

An electrohydropulse well device is known (author's certificate of the USSR Mo 1457489, IPC E21B 43/24, published 07.10.1991, B.IM. Mo 37), which contains a generator of pulse currents and an electrode system electrically connected to it, which are placed in a hermetic, a case filled with a dielectric liquid with windows that are covered with an elastic membrane, the electrode system includes a positive electrode made of a tubular form of erosion-resistant material, while the case has channels located in the upper part of the cavity formed by the membrane and covered on the outer surface with an elastic ring.

The features that coincide with the essential features of the invention are the following: a hollow cylindrical body, the pulse current generator is electrically connected to the central electrode of the electrode system; the cavity between the housing and the ring membrane is filled with working fluid.

The reasons that prevent obtaining the necessary technical result should include the following.

The presence of rigid metal non-insulated windows with jumpers (ribs) of the body of the electrode system affects the propagation of pressure waves in the well and contributes to the formation of "blind" zones during processing - parts of the near-hole zone that cannot be processed, and also leads to non-axial orientation of the discharge channel and non-radial , and the axial propagation of pressure waves, which causes an increase in the shock-wave load on the elements of the electrode system with their subsequent damage and destruction.

In addition, the tubular electrode made in the form of a wound tape made of erosion-resistant material with a working part in the form of an annular edge is prone to deformation and destruction due to shock-wave action caused by an electric discharge in the liquid and erosive wear, and its design does not allow for quick replacement. The operation of the device with a deformed or destroyed anode when filling the electrode system with a dielectric liquid is indicated

This affects the efficiency and stability of work due to the deterioration of the conditions for the ignition of the discharge and the subsequent high-voltage breakdown of the interelectrode gap. This is especially critical in conditions of increased hydrostatic pressure. At the same time, the use of oil- and gasoline-resistant rubber as a membrane material does not exclude the possibility of its rupture during operation or during lowering and raising of the device.

The closest in terms of features to the invention is the electrohydroimpulse well device (patent of Ukraine Mo 27436, IPC 6 E21B 43/112, published on 15.09.2000, bulletin Mo 4), which contains a hollow body, made with windows covered by an annular membrane, and with an outlet a channel, a central electrode with an insulator, which are placed in the housing, a pulse current generator, which is electrically connected to the central electrode, a cavity formed by the housing and an annular membrane, which is filled with a dielectric liquid; choke, which is made in the form of annular grooves on the outer side surface of the insulator, which connects to the hollow body; check valve, which is made in the form of a glass with a radial hole near the bottom.

Features that coincide with the essential features of the claimed invention are the following: contains a ground part, which includes a power source and a submersible part connected to it by a geophysical cable, in the form of a hollow cylindrical body, consisting of separate, hermetically connected parts , in which a pulse current generator and an electrode system are placed, the central electrode of which is placed in an insulator with a choke electrically connected to the pulse current generator, an annular membrane is fixed on the cylindrical body of the electrode system, and the cavity between the body and the annular membrane is filled with a working fluid.

Among the reasons that prevent obtaining the required technical result, one should include the fact that the presence of rigid metal non-insulated bridges (ribs) of the windows of the electrode system body leads to non-axial orientation of the discharge channel and not radial, but axial propagation of pressure waves, which causes an increase in shock-wave load on the elements of the electrode system with their subsequent damage and destruction. At the same time, to ensure the strength of the structure, the cross-sectional area of one rib should be at least 150-105 me, otherwise their destruction is possible as a result of complex shock-wave and electroerosion effects. This significantly reduces the volume of liquid inside the case and has a negative effect on the resource and efficiency of the device. Also, the presence of ribs affects the propagation of pressure waves in the well and contributes to the formation of "blind" zones during processing - parts of the near-hole zone that cannot be processed. In addition, the use of an elastic ring membrane does not exclude the possibility of its rupture during operation or during lowering and raising of the device.

At the same time, the electrode used in the device is prone to deformation and destruction due to shock-wave action caused by an electric discharge in the liquid, and erosive wear. Its design does not allow for a quick replacement, and the operation of the device with a deformed or destroyed electrode when the electrode system is filled with a dielectric liquid is accompanied by a decrease in the efficiency and stability of its operation due to the deterioration of the conditions for the ignition of the discharge and subsequent high-voltage breakdown of the interelectrode gap. This is especially critical in conditions of increased hydrostatic pressure.

The choke, made in the form of a cut on the body of the insulator made of polymer dielectric material, is deformed and destroyed under the influence of impulse pressure, as a result of which it cannot perform its function - to ensure the movement, with the loss of kinetic energy, of gaseous products of electric discharge to the non-return valve for further discharge into the environment environment.

The invention is based on the task of improving the electrohydropulse well device by changing the designs of the electrode system housing, the central electrode and the choke and using new working substances and membrane material, which will allow to ensure reliable sealing of the electrode system housing, reduce the area of "blind" zones - parts of the well's near-off zone, which are not amenable to processing, exclude non-axial orientation of the discharge channel and stabilize the process of ignition of the electric discharge under conditions of high hydrostatic pressures and temperatures, ensure uninterrupted removal of gaseous products of the electric discharge into the environment, and due to this increase the efficiency of the device, its reliability and stability during processing wells In addition, the mass of the device is reduced, the process of its manufacture is facilitated, the anode replacement procedure is simplified and accelerated, and the service life of the device is increased.

З The task is solved by the fact that in an electro-hydropulse well device, which contains a ground part, which includes a power source and an immersion part connected to it by a geophysical cable, in the form of a hollow cylindrical body, consisting of separate, hermetically connected to each other of parts in which a pulse current generator and an electrode system are placed, the central electrode of which is placed in an insulator with a choke, electrically connected to the pulse current generator, an annular membrane is fixed on the cylindrical body of the electrode system, and the cavity between the body and the annular membrane is filled with a working fluid, according to the invention, the body of the electrode system consists of two parts: the upper and the lower, which are connected to each other by conductive flexible cables with a diameter of 4 to 5 mm with an external insulating layer, the choke is made in the form of a metal sleeve, which is put on the insulator of the central electrode, and the lower end part of the central one the electrode has a replaceable anode, which is connected to the central electrode using a Morse cone, and the working part of the anode is made in the form of a truncated cone, the working fluid is an aqueous salt solution 3 with a specific conductivity from 0.04 to 0.31 S/m, and the annular the membrane is made of multi-layer rubber fabric material.

The sign "the body of the electrode system consists of two parts: upper and lower, which are connected to each other by conductive flexible cables with a diameter of 4 to 5 mm with an outer insulating layer" allows: to reduce the area of "blind" zones during processing - parts of the near-breakage zone, which are not amenable to processing, exclude off-axis orientation of the discharge channel due to the presence of an external insulating layer on the cables and, accordingly, reduce the shock wave load on the structural elements of the electrode system; exclude the possibility of device failure due to the destruction of the ribs as a result of complex shock-wave and electroerosion effects. In addition, the weight of the device decreases and the volume of liquid that fills the body cavity increases.

The sign "the choke is made in the form of a metal sleeve, which is put on the insulator of the central electrode" ensures the integrity of the choke structure under the conditions of impulse shock-wave action, which allows for uninterrupted movement of gaseous products of electric discharge to the non-return valve with a loss of kinetic energy for their further discharge into the environment environment.

The sign "the lower end part of the central electrode has a replaceable anode, which is connected to the central electrode by means of a Morse cone, and the working part of the anode is made in the form of a truncated cone" allows: to simplify and speed up the procedure for replacing the replaceable anode, increase the service life of the anode and stabilize the process ignition of a discharge due to an increase in the intensity of the electric field at its tip.

The sign "the working fluid is an aqueous salt solution with a specific electrical conductivity from 0.04 to 0.31 S/m" allows to ensure stable ignition of an electric discharge, and, accordingly, the efficiency of processing in conditions of high hydrostatic pressures and temperatures due to filling the cavity with a liquid with a certain specific electrical conductivity.

The sign "annular membrane is made of multilayer rubber fabric material" allows to ensure the sealing of the case by eliminating the rupture of the elastic membrane as a result of shock-wave action and in the process of raising or lowering the device, thanks to the increased strength of the structure of multilayer rubber fabric material.

The drawings explain the essence of the invention.

In Fig. 1 shows the diagram of the general appearance of the electro-hydropulse well device.

In fig. 2 - drawing of a closed electrode system.

In fig. C - section along B-B.

In fig. 4 - a drawing of a removable replaceable anode.

The electrohydropulse well device contains (Fig. 1) a ground power source 1 and a submersible part 3 connected to it by means of a geophysical cable 2, in the lower part of which there is an electrode system 4. The submersible part of the device C is made in the form of an empty cylindrical body consisting of from separate parts hermetically connected to each other, in which the pulse current generator (not shown in the figure) is placed, which is electrically connected to the central electrode 5 (figure 2), which is located in the electrode system 4.

The electrode system (Fig. 2, Fig. 3) contains the adapter b and the housing, which is made of two parts: the upper part of the housing 7 and the lower part - 8. The upper part of the housing 7 is connected to the lower part 8 by conductive flexible cables 9 with a diameter of 4 mm to 5 mm, which have

From the outer insulating layer. An elastic ring membrane 12 is fixed on the lower 8 and upper 7 parts of the body of the electrode system with the help of clamps 10 and bolts 11. The cavity 13 between the body of the electrode system and the ring membrane 12 is filled with a working fluid - an aqueous salt solution with a specific electrical conductivity from 0.04 to 0. 31 cm/m. The elastic ring membrane 12 is made of multilayer rubber fabric material.

The check valve 14 is located in the upper part of the housing 7.

The central electrode 5 is placed in the insulator 15. The end part of the electrode 5 contains a removable replaceable anode 16. The anode 16 is connected to the electrode 5 using a Morse cone 17 (Fig. 4). The working part of the anode 18 is made in the form of a truncated cone. The central part of the anode and part of the surface of the working part of the anode 18 are placed in the insulating tip 19 (Fig. 2). The insulator 15 is fitted with a metal sleeve-throttle 20.

The central electrode 5, the removable anode 16, the insulator 15 and the insulating tip 19 are assembled together and inserted into the adapter 6.

The electro-hydropulse well device works as follows.

Before immersion in the well, cavity 13 (Fig. 2) is filled with an aqueous salt solution with a specific electrical conductivity from 0.04 to 0.31 S/m. This ensures a stable breakdown of the interelectrode gap in conditions of high hydrostatic pressure and temperature. The replaceable anode 16 (Fig. 2) is mounted with the electrode 5 (Fig. 2) using a Morse cone 17 (Fig. 4). Such a connection ensures high accuracy of centering and reliability of fastening. Then the upper part of the housing 7 (Fig. 2) is connected to the adapter 6 (Fig. 2). After that, the closed electrode system 4 (Fig. 1) is mounted with other elements of the immersed part of the device (other elements of the immersed part are not shown separately in the figure).

The submersible part of the device 3 (Fig. 1) is lowered into the well on the geophysical cable 2 (Fig. 1) to the processing area. The ground part of the device 1 (Fig. 1) provides power supply to the submersible part of the device. In the immersed part, the power supply voltage is converted into high-voltage voltage. After applying a high voltage to the central electrode 5 (Fig. 2), a high-voltage breakdown of the interelectrode gap between the removable anode 16 (Fig. 2) and the lower part of the body of the electrode system 8 (Fig. 2) occurs. The shape of the end part of the anode in the form of a truncated cone 18 (Fig. 4) has resistance to shock wave impact, which is generated by an electric discharge in a liquid, and also has a longer service life compared to a cylindrical or ring anode. In addition, the similar shape of the final part of the anode allows to stabilize the process of ignition of the discharge due to the increase in the intensity of the electric field at its tip.

Hydroflows and high pulse pressure arising during an electric discharge in the cavity during passage through the channels of the removable choke-sleeve 20 (Fig. 2) lose the main part of their energy, which eliminates pulse loads on the check valve 14 (Fig. 2). The removable throttle sleeve 20 is made of metal, which excludes the possibility of its deformation and destruction under the influence of pulse-wave loading. Gaseous products, which are formed during an electric discharge in the liquid, after passing through the channels of the choke-sleeve 20 (Fig. 2), through the non-return valve 14 (Fig. 2), are released into the well fluid.

As a result of the breakdown of the interelectrode gap, a pressure wave is generated, which propagates in the liquid filling the cavity 13 (Fig. 2), passes through the elastic membrane 12 (Fig. 2) into the well fluid and acts on the bottom hole zone of the well. The elastic membrane 12 is made of multi-layer rubber fabric material, which ensures sealing of the housing and excludes its rupture as a result of shock wave action and during the raising or lowering of the device, and also does not have a significant effect on the propagation of pressure waves and accompanying hydrodynamic phenomena.

The elastic membrane ensures the influence of pressure waves and hydroflows on the bottom-hole zone of the well, thereby increasing its permeability and additional inflow of liquid into the well.

Thus, the use of an electrohydropulse well device will ensure reliable sealing of the body of the electrode system, reduce the area of "blind" zones during processing, exclude non-axial orientation of the discharge channel and stabilize the process of ignition of the electric discharge in conditions of high hydrostatic pressures and temperatures, and due to this, increase the efficiency of work of the device, its reliability and stability when processing wells. In addition, the weight of the device is reduced, the process of its manufacture is facilitated; the procedure for replacing the anode is simplified and accelerated, and the service life of the device increases.

Claims (1)

FORMULATION OF THE INVENTION An electro-hydropulse well device containing a ground part, which includes From the power source and the submersible part connected to it by a geophysical cable, in the form of a hollow cylindrical body consisting of separate, hermetically connected parts, which houses the pulse current generator and the electrode system, the central electrode of which is placed in the insulator with a choke, electrically connected to the generator of pulse currents, an annular membrane is fixed on the cylindrical body of the electrode system, and the cavity between the body and the annular membrane is filled with a working fluid, which is distinguished by the fact that the body of the electrode system consists of two parts: the upper and the lower, which interconnected by conductive flexible cables with a diameter of 4 to 5 mm with an external insulating layer, the choke is made in the form of a metal bushing that is put on the insulator of the central electrode, and the lower end part of the central electrode has a replaceable anode, which is connected to the central electrode with the help of a Morse cone, and the working part of the anode is onana in the form of a truncated cone, the working fluid is an aqueous salt solution with a specific electrical conductivity from 0.04 to 0.31 S/m, and the ring membrane is made of multilayer rubber fabric material.