UA28271U - Appliance for increasing well productivity - Google Patents

Abstract

Appliance for increase of well productivity that has source of electric power as three-phase voltage controller connected through power cables to working electrodes.

Description

Description of the invention

The useful model belongs to the hydrogeology and oil industry and can be used in 2 exploitation of artesian or hydrogeological wells, as well as oil wells.

A well-known device for increasing the productivity of a hydrogeological well, containing a source of unipolar electric current, connected by means of a cable to working electrodes (a.s. of the USSR

Mo899867, cl. E21843/00, 19821.

The disadvantages of the known device are limited functionality, which does not allow to obtain a noticeable 70 effect when using the device in the entire possible spectrum of characteristics of product layers.

A well-known device for increasing the productivity of a well, containing a source of direct current, connected by a cable with two working electrodes and made with the possibility of changing polarities (a.s. of the USSR

Mo1670109, cl. E21843/00, 19911.

The disadvantage of the known device is its low functionality, not providing differentiated modes of action due to the features of the processed layer.

The closest analogue is a device for increasing the productivity of a well, which contains a source of electric voltage connected via power cables to at least two working electrodes (a.s. of the USSR

Mo1273514, cl. E218B43/00, 19861.

The disadvantage of the known device is its limited functionality, since the structural elements of the device do not provide the formation of electric current pulses with a wide range of required parameters.

The useful model is based on the task of intensifying or increasing the efficiency of water or oil extraction in new wells or in wells in which the production of the product is insufficient, for example, due to clogging of the pores and capillaries of the productive layer, the large waterability of oil wells, and the creation of a multifunctional device that allows targeted and differentially carry out the complex of actions that is necessary to increase the permeability of the pre-filter zone for the extracted product and reduce energy consumption.

The task is solved by the fact that the device for increasing the productivity of the well, which contains a source of electric voltage, connected via power cables to at least two working electrodes and, (7 according to a useful model, the source is made in the form of a three-phase voltage regulator with input terminals for - connection to a three-phase alternating current network, the three power outputs of which are connected to the three power inputs of the step-down transformer, the three power outputs of which and the neutral bus of its secondary winding are connected to the three power inputs and the neutral bus of the block of controlled rectifiers, the two outputs of which through the opening contacts of the first switch are connected to two power inputs of the current switch, and through the closing contacts of the first switch are connected to two power inputs of the low-frequency pulse modulator, the two power outputs of which are connected through the closing contacts of the second switch to two output terminals to which the power cables are connected and which through the opening and the contacts of the second switch are connected to two power outputs of the current switch, and is equipped with a control and control unit, the first control "4, the output of which is connected to the control input of the voltage regulator, the control output of which is connected to C 0, the first control input of the control and control unit, the second, the third and fourth control outputs of which are connected, respectively, to the control inputs of the unit of controlled rectifiers, the current commutator and the modulator of low-frequency pulses, while the control output of the current commutator is connected to the second control input of the control and control unit, the third control input of which is connected to the control output low frequency pulse modulator.

In addition, metal filters of casing columns or electrically isolated metal filters connected through auxiliary electrodes and power cables to input terminals are used as working electrodes.

Ge | Also, metal electrodes are placed in the cavity of open filters.

Drawings explain the essence of a useful model. Figure 1 shows a block diagram of a device for increasing well productivity; in Fig. 2, the diagram - and 20 of the connection to the reservoir through the casing strings of two wells; in Fig. 3, the connection diagram through metal electrically isolated filters of two wells; Fig. 4 shows the connection diagram of two metal electrodes placed in open filters of two wells to the formation.

The device for increasing the productivity of the well consists of unit 1 of the voltage regulator (VT), unit 2 of the power transformer (ST), unit C of controlled rectifiers (BKV), unit 4 of the current commutator (CT), unit 5 29 of the low-frequency pulse modulator (MINU), control and control unit 6 (BKK), the first switch 7 (PI), from the second switch 8 (P2). The RN is equipped with input terminals 9 for connection to a three-phase industrial network. The device is also equipped with output terminals 10 and 11 for connecting via power cable 12 working electrodes 13 and 14. Switch 7 contains opening contacts 15 (normally closed) that connect

BKV with CT and closing 16 contacts (normally open), which connect BKV with MINCH. The switch 8 contains 60 opening 17 contacts (normally closed), which connect the CT with the output terminals 10 and 11, as well as closing 18 contacts (normally open), which connect the MINCH with the output terminals 10 and 11.

RN is made on thyristors, and there are two thyristors on each phase, turned on opposite to each other. Current transformers (CRT) are included at the input of the RN for each phase, which measure the strength of the output current. because ST is made according to a three-phase scheme on a common core for all windings. The secondary windings have taps for voltage regulation. The primary and secondary windings are connected according to the M Mo scheme.

BKV is made on six thyristors, which are connected in such a way that it is possible to obtain the following rectification schemes from them: a) Larionov scheme; b) single-semi-periodic circuit with a positive output voltage relative to the zero bus of the CT secondary winding; c) single-semi-periodic circuit with a negative output voltage relative to the zero bus of the secondary winding of the CT.

CT is made on four thyristors according to the bridge scheme.

MINCH is made on two thyristors according to the parallel inversion scheme. 70 BKK is designed to generate control signals by turning on and off thyristors BKV, CT and

MINU, for the switching of control circuits in order to switch the BCC to one of the schemes a, b, c and CT switching, as well as for measuring the output voltage and output current, the duration of current pulses, the steepness of the pulse fronts, the rise and fall time of the current. The signals that control the turning on and off of thyristors are generated by distributing a sequence of pulses from a setting generator (not shown), which is part of the BKK, 7/5 | are modulated with a frequency of 10 kHz. In the future, the control signals through the pulse distributor and the switch of the control circuits, which are part of the BKK, are fed to the control electrodes of the power thyristors of all blocks.

The device works like this.

The input three-phase voltage З8ОВ with a frequency of 50 Hz is supplied via a three-phase cable to the input of the RN. Current transformers are located at the input of the RN, from the secondary winding of which a voltage proportional to the current consumed by the device from the network is removed. This voltage is applied to the first control input of the BCC, where it is converted and recalculated to the output of the device so that the value of the current at the output terminals 10 and 11 is conveniently read on the control measuring device (not shown). The same voltage is used for the operation of the protection circuits device (not shown).

RN provides a smooth adjustment of the input voltage of the З8ОУ in the range of 300-3808V, which allows you to keep it in a quasi-sinusoidal form.

On the first control output from the BKK, signals are sent to the control electrodes of the LV thyristors, which provide a cut-off depth sufficient to regulate the voltage value in the interval indicated above.

Next, the voltage on the power circuits is applied to the primary windings of the ST. The secondary phase windings provide step-wise lowering of the input voltage to values of 230; 160 and 1158 at an input voltage of 3808, the current strength at "- with this in the secondary circuits increases proportionally.

Then the three-phase voltage is fed from the ST through the power circuits to the input of the BKV, then through the switch P1, CT, - switch P2 to the output terminals 10 and 11. s

The BKK thyristors are switched on and off via the second BKK control output, and CT thyristors are switched on and off via the third BKK control output. Inside the BKK, with the help of a special switch (not shown), control circuits are switched on the outputs of the second, third, and fourth BKK so that the following modes of operation of the BKV and CT units are provided.

Mode I, in which the thyristors in the BKV block are turned on according to the Larionov scheme, and unipolar quasi-rectangular pulses are formed at its output based on signals from the BKK. The thyristors in CT are connected according to the bridge circuit. Pulses are fed into one diagonal of the bridge. The thyristors in CT are connected according to the bridge circuit. In one diagonal of the bridge, pulses from BKV are supplied, in the second, loads (working electrodes) are included. CT thyristors are switched on by signals from pl) with BKK in pairs in such a way that they ensure a change in the polarity of the voltage at the output terminals 10 and 11 and the flow of a nonpolar current in the load. ;" Mode II, in which thyristors in BKV are included in the circuit of two single-semicurrent rectifiers working alternately; one creates a positive voltage relative to the neutral bus of the CT secondary winding, the other negative. CT thyristors are included in such a way that two of them ensure the passage of current from the "positive rectifier" through the load to bus O of the CT secondary winding, and the other two - from the "negative".

Mode I, in which the output of the device with the help of switches P1 and P2 is turned on instead of CT. During the passage of a pulse from the BKV, a voltage appears at the input of the MINCH, and its thyristors receive control signals that come from the BKK through the fourth control output with a frequency an order of magnitude higher than the frequency of the pulses

From BKV, at the same time, bundles of multipolar pulses arrive at the output terminals 10 and 11. From output terminals 10 and 11

Ш- through the power cables 12, current pulses are supplied to the working electrodes 13 and 14. as in mode I (Fig. 2), the output terminals 10 and 11 are connected through the power cables 12 to the casing strings 19 of the two processed wells 20. The current through the casing strings 19 is supplied on metal filters 21, which act as working electrodes. In the same mode 1, the output terminals 10 and 11 can through cables and two auxiliary electrodes 22, which are lowered into the wells, connected to electrically insulated metal filters 21, which act as working electrodes (Fig. 3). c In the same mode, the output terminals 10 and 11 through the power cables 12 are connected to those lowered into the "open filters" 23 of the wells, which do not have a metal filter, by metal electrodes 13 and 14, which act as working electrodes (Fig. .4). In mode II, one of the output terminals is connected through the power cable, as described above, and the second - to any working electrode or group of electrodes that provide a current circuit between the output terminals 10 and 11 through the treated layer. This role can be performed by a monitoring or preserved well, the zero contour of a bush of wells or a field section.

In the II mode, the output terminals are connected to the working electrodes in the same way as in the I or II modes of operation. 65 Example 1.

The method was applied simultaneously on two oil wells Mb1 and Mb2 of the Dosmakhambetov deposit. The duration of the pulses was set equal to 72 milliseconds with a gap equal to I. The initial current was 880A, with a steepness of the back edge of the pulses of 8OA/ millisecond. The maximum current after 11.5g is 1050A at a torque of 123A/mls. After 24 hours, the current is equal to 940A, with a torque of 104A/mls. Thus, the steepness changed accordingly 8-0 AS 1-1.53-1.3.

The characteristics of the wells before and after the action are shown in Table 1. and oil production We | 228 | 06 | then

Example 2

The method was applied to well M 3329/2400 at the Ermakovskoye field. The total time of operation is 26 Г, the duration of pulses is 5 mls with a sparability equal to 1. The initial current is 2100A at a torque of 175A/mls.

The maximum current after 12 hours is 2500A, with a torque of 312A/mls. At the end of work, the current is 2300A at a torque of 244A/mls.

Thus, the steepness varied accordingly as 1-1.78-1.39.

The characteristics of the well before and after using this method are shown in Table 2. zv. Z

Similar results were obtained on other wells, which allows us to conclude about the great effectiveness of the method of pulse resonance action for improving the properties of reservoir collectors.

Example From

The method was applied to the hydrogeological well of the MN Kyiv water intake in the city of Kursk, in which, as a result of operation, the flow rate was reduced to 0.

The duration of the pulses was equal to 32 mls, with a sparability equal to 2. The initial current was 9 BA, with a torque of 09 10.8 A/mls. The maximum current after 16 hours is 110A at a torque of 14.4A/mls. The indicated action almost completely restored the flow rate of the well, equal to zom g.

Claims (2)

The formula of the invention « 40 Sh | | | . shi 1. A device for increasing the productivity of a well, containing a source of electrical voltage, c connected via power cables to at least two working electrodes, which is characterized by the fact that the source is made in the form of a three-phase voltage regulator with input terminals for connection to a three-phase alternating current network , the three power outputs of which are connected to the three power inputs of the step-down transformer, the three power outputs of which and the zero bus of its secondary winding are connected to the three power 7 inputs and the zero bus of the controlled rectifier block, the two outputs of which are connected through the opening contacts of the first switch to the two power inputs of the commutator current, and through the closing contacts of the first (ee) switch are connected to two power inputs of the low-frequency pulse modulator, the two power outputs of which are connected through the closing contacts of the second switch to two output terminals to which power cables are connected and which through the opening contacts of the second switch equipped with two power outputs of the commutator and current, and equipped with a control and control unit, the first control output of which is connected to the control input of the voltage regulator, the control output of which is connected to the first control input of the control and control unit, the second, third and fourth control outputs of which connected respectively to the control inputs of the unit of controlled rectifiers, current commutator and low-frequency pulse modulator, while the control output of the current commutator is connected to the second control input of the control and control unit, the third control input of which is connected to the control output of the low-frequency pulse modulator. with 2. The device for increasing the productivity of the well according to claim 1, which differs in that metal filters of casing columns or electrically insulated metal filters are used as working electrodes, connected through auxiliary electrodes and power cables to the input terminals. in Z. The device for increasing the productivity of the well according to claim 1, which is characterized by the fact that the metal electrodes are placed in the cavity of the open filters. b5