RU116569U1 - DEVICE FOR GENERATING ELASTIC PULSES IN A WELL HYDROSPHERE - Google Patents

Abstract

1. A device for generating elastic pulses in the hydrosphere of a borehole, comprising a body of a downhole tool, which contains: a capacitor storage of electrical energy, an electric spark gap, an emitter consisting of high-voltage and low-voltage electrodes, and a mechanism for feeding a calibrated conductor into the interelectrode space of the emitter, characterized in that, that it is equipped with a ground source of current with a frequency of 300 ÷ 1000 Hz, connected to the downhole tool with a single-core geophysical cable, and the downhole tool contains a high voltage multiplier, the capacitors of the electric energy storage are placed on the chassis in the body of the downhole tool and are equipped with wire resistors of different lengths equalizing the discharge currents of the capacitors ... ! 2. A device for generating elastic pulses in the hydrosphere of a well according to claim 1, characterized in that the mechanism for feeding a calibrated conductor into the interelectrode space of the emitter is made in the form of a system of spring-loaded cams and a spring-loaded electromagnet thrust and is equipped with a bobbin with a stock of calibrated conductor installed in the body of the feed mechanism ... ! 3. A device for generating elastic pulses in the hydrosphere of a well according to claim 1, characterized in that the body of the downhole tool is made with a diameter of 42 mm and a length of 2700 mm.

Description

The utility model relates to the field of mining of rare metals and other minerals developed by the method of underground leaching, in particular, to means for influencing the bottom-hole zone of wells filled with liquid, in particular to sources of elastic impulses generation based on plasma-pulse impact, and can be used in oil, gas, hydrogeological and engineering-geological wells.

A well-known source of seismic energy containing a plasma-pulse discharger, a storage energy unit, a charger, a control system, a wire feed mechanism for closing the electrodes, the specified source is made of two sections, the first section contains a plasma-pulse spark gap, a feed mechanism conductor and power storage unit, and the second section contains a control system and a charger. According to a second embodiment, said source may have a diameter of 42 mm and a length of 3750 mm. According to the third embodiment, the specified source is equipped with a means for its descent and ascent, which is used as a wellhead gateway (Pat RF №105476, prior. 05.03.2011, publ. 10.06.2011, G01V 1/00).

Since the well-known source consists of two sections, for its safe assembly additional lubricator equipment and a special device in the well are required, which reduces ease of use and increases maintenance work.

A known source of seismic energy containing a plasma-pulse arrestor, a storage energy unit, a charger, a control system, a wire feed mechanism for closing electrodes (Pat. RF No. 2373386, G01V 1/157, prior. 01.07.2008, publ. 20.11.2009 )

A disadvantage of the known design is that it has large dimensions in diameter and can be used only after dismantling the tubing and mandatory killing of the oil well.

This utility model solves the problem of reducing the size and simplifying the design, increasing reliability and ease of use, reducing labor costs.

The problem is solved in that the device for generating elastic impulses in the hydrosphere of the well, containing the body of the downhole tool, which contains: a capacitor storage of electrical energy, an electric discharger, a high-voltage and low-voltage electrode of the emitter and a mechanism for supplying a calibrated conductor into the interelectrode space of the electro-hydraulic emitter, is equipped with a ground a current source with a frequency of 300 ÷ 1000 Hz, connected to the downhole tool with a single-core geophysical cable, and SLE a living device - with a high voltage multiplier, the capacitors of the electric energy storage device are placed on the chassis in the body of the downhole tool and are equipped with wire resistors of different lengths equalizing the discharge currents of the capacitors, and the mechanism for supplying a calibrated conductor into the interelectrode space of the emitter is made in the form of a system of spring-loaded cams and spring-loaded traction of an electromagnet, equipped reel with a stock of calibrated conductor installed in the body of the feed mechanism, while the body of the downhole tool The ora is made with a diameter of 42 mm and a length of 2700 mm.

Figure 1 shows the projection of the trajectories of the well No. 13-4-3 deposits of rare metals, developed by underground leaching, on the vertical and horizontal planes:

- a) a vertical North-South section;

- b) a vertical West-East section;

- c) a horizontal West-East section.

Figure 2 presents a block diagram of a device for generating elastic impulses in the hydrosphere of the well.

Figure 3 shows a section of a downhole tool.

Figure 4 presents the feed mechanism of the calibrated conductor.

Figure 5 shows the waveforms of the pulses of the borehole source of elastic pulses of electro-hydraulic (plasma-pulse) exposure:

a) - without initiating electro-hydraulic discharge by the conductor;

b) - when initiating an electro-hydraulic discharge by a conductor.

The inventive device comprises a ground power supply, control and monitoring unit 1 connected by a single-core geophysical cable 2 (type KG-1) to a downhole tool 3 (Fig. 2), in which are located: a high voltage multiplier 4, a capacitor storage of electrical energy 5, an electric spark gap 6, a high-voltage electrode of the emitter 7, a calibrated conductor 8, a low-voltage electrode 9 of the emitter. Pos.10 - the mechanism for feeding a calibrated conductor into the interelectrode space of the emitter. Pos.11 - control circuit of the discharge of the capacitor storage of electrical energy and the feed mechanism of the calibrated conductor.

The feed mechanism 10 of the calibrated conductor 8 into the interelectrode space is made in the form of cams 12 and is equipped with a spring-loaded 13 thrust 14 of the electromagnet 15. The stock of the calibrated conductor 8 is placed in the reel 16 (figure 4).

In the casing of the downhole tool 3 on the chassis there are capacitors 17 of the electric power storage device 5 with equalizing additional wire resistors 18 of different lengths (Fig. 3).

The device operates as follows.

During tripping operations on the well, the ground power, control and monitoring unit 1 is connected by a single-core geophysical cable 2 (KG-1) to the downhole tool 3 and the equipment is checked in manual mode. By pressing the "pull" button, the calibrated conductor 8 is fed into the interelectrode space of the electric emitter by supplying direct current pulses to the electromagnet of the conductor feeding mechanism. After that, by pressing the “charge” button, a voltage with a frequency of 300 ÷ 1000 Hz is supplied to charge the capacitors 17. The voltage growth process and the achieved charge voltage are recorded by the control and measuring equipment in the ground control and monitoring power supply unit 1. Then, by pressing the “discharge” button, the discharge is performed " capacitors of the electric energy storage device 5, while the discharge current is also recorded in the ground unit. The next operation checks the operation of the device in the automatic mode “pulling - charge - discharge" by switching the toggle switch "type of work" to "automatic mode". Thus, the readiness of the device for work in the well is checked.

After removing the submersible pump from the pumping hole and installing the well balance of the logging hoist at the wellhead, the downhole tool is launched on the KG-1 cable to the well filter zone, and the descent depth is controlled by the depth gauge.

The filter is processed at stops at 0.5-1.0 m of the well depth from the bottom up 10-30 pulses at each point with a repetition period of 2-3 pulses per minute over the entire interval of the filter zone (Fig. 4). The number of discharge pulses is fixed in the ground block.

After lifting and removing the downhole tool from the well, the submersible pump descends again and the work of the well is restored.

According to the testimony of the measuring instrument 1, the flow rate of the pumping well is recorded after treatment.

The processing efficiency is estimated by measuring the production rate of the well before and after processing the well.

The use in liquid-filled wells of a device for generating elastic impulses with energies of the order of 1.0-1.2 kilojoules and a frequency spectrum from units of hertz to several kilohertz allows decolmatization of filters and the near-wellbore zone and, by acting on the reservoir, excite in the “well-reservoir” system resonant vibrations that contribute to the restoration and increase in permeability (piezoconductivity) of the reservoir.

It should be noted that the range of the plasma-pulse action by the elastic pulses of this device is 300-400 m, so all wells located in this radius will respond positively.

The downhole device of the source of elastic impulses is provided with alternating current power of 300 ÷ 1000 Hz from a ground-based power supply unit, which made it possible to significantly simplify the conversion circuit to obtain a high voltage for charging capacitors in a downhole tool, using only the voltage multiplication circuit to 2.5-3.0 kilovolts, which allowed to reduce the dimensions of the power supply in the downhole tool, and the control of direct current pulses by an electric discharger and an electromagnet of the mechanism for supplying the conductor to the interelectrode a nd simplify the design and realize tripping in single-core logging cable with elastic energy pulses 1.0-1.2 kilojoules in a single housing unit 42 mm at a total length of 2700 mm in the downhole tool. The use of additional wire resistors equalizing the discharge currents of the capacitors in the electric energy storage unit allowed to increase the life of the capacitors. The changed design of the emitter made it possible to create elastic impulses in a medium with fluid mineralization of 5-30 g / l without initiating an electro-hydraulic discharge by a calibrated conductor (Fig. 4-a).

The proposed utility model solves the technical problem of creating an effective means for initiating elastic pulses of significant power with a wide frequency range in the wells and creating pressure and compression pressure pulses, cleaning the filter and near-well zone of the pumping and (or) injection wells and creating their own parametric resonance of the “well - productive formation ”, restoring and increasing the initial permeability of the formation and increasing the mobility of the working agent.

The proposed utility model allows us to solve the problem of intensifying the extraction of rare metals and other minerals by underground leaching.

A distinctive feature of equipment for rare metal deposits by underground leaching is the use of plastic pipes, filters, fittings, pump designs and other equipment that is resistant to acidic conditions. This creates certain difficulties in maintaining wells with a certain trajectory, and, considering that the wells are cased with flexible plastic pipes and are practically not fixed, during operation (due to heaving of clays and other technological reasons), they become distorted and inaccessible to downhole tools, commensurate with the outer diameter of the inner diameter of the casing. So, in wells with an internal diameter of 74 mm, a device of 60 mm and a length of 3.0 m in the filter zone is extremely difficult (Figure 1).

For this reason, geophysical surveys in pumping and injection wells during underground leaching of ores (in particular, in the deposits of Russia and Kazakhstan) are performed by instruments with a diameter of 42 mm and a length of not more than 3 m.

To avoid spills of acid or alkaline solutions when working on a well, wellheads must be sealed, therefore the use of a single-core geophysical cable with a plastic coating is mandatory, which also extends its life.

Claims (3)

1. A device for generating elastic impulses in the hydrosphere of a well, comprising a body of a downhole tool, in which are located: a capacitor storage of electrical energy, an electric discharger, an emitter consisting of high-voltage and low-voltage electrodes, and a mechanism for supplying a calibrated conductor to the interelectrode space of the emitter, characterized in that it is equipped with a ground current source with a frequency of 300 ÷ 1000 Hz connected to the downhole tool with a single-core geophysical cable, and the downhole tool is It holds a high voltage multiplier, the capacitors of the electric energy storage device are placed on the chassis in the body of the downhole tool and are equipped with wire resistors of different lengths equalizing the discharge currents of the capacitors. 2. The device for generating elastic impulses in the hydrosphere of a well according to claim 1, characterized in that the mechanism for supplying a calibrated conductor into the interelectrode space of the emitter is made in the form of a system of spring-loaded cams and spring-loaded traction of an electromagnet and is equipped with a reel with a supply of calibrated conductor installed in the housing of the supply mechanism . 3. The device for generating elastic impulses in the hydrosphere of the well according to claim 1, characterized in that the body of the downhole tool is made with a diameter of 42 mm and a length of 2700 mm.