RU2625840C1 - Downhole chemical reagent dosing unit - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device contains a cylindrical body. On one side of the body there is a sealed module with an intelligent unit. On the other side of the body there is a base with a mixing chamber, having a controlled valve, inlet and outlet channels communicating with the mixing chamber. The intelligent unit is connected by an electrical conductor in an insulating jacket located in a sealed tube with the controlled valve, and the sealed module consists of a nipple and a flange connected by the body. Two channels are provided in the nipple of the sealed module. One temperature sensor is hermetically sealed in one channel. A pressure sensor is hermetically sealed in the other channel. A temperature sensor of the submersible motor is mounted in the flange of the sealed module. These sensors are electrically connected to the intelligent unit. The intelligent unit is equipped with a function to monitor the insulation resistance and temperature of the motor winding by connecting to the winding of the motor through a neutral wire.

EFFECT: reliability of the downhole chemical reagent dosing unit is increased.

5 cl, 1 dwg

Description

FIELD OF THE INVENTION

The invention relates to the oil industry, in particular to submersible devices for supplying reagent to the well, to the surface of submersible electric motors and the inlet of electric centrifugal pumps, and can be used to prevent corrosion, deposits of salts and paraffins on oil production equipment to increase the reliability of the ESP.

State of the art

A device for dosed supply of reagent into the well is known, including a container with a chemical reagent and a plunger metering pump placed between it and a sucker rod pump. The metering pump plunger is attached to the stem, driven by the differential pressure of the liquid during operation of the sucker rod pump (SU 1617198, F04B 47/00; Е21В 43/00).

The disadvantages of the device include the impossibility of using it with other types of oil-producing pumps (centrifugal, axial, etc.) and the uneven supply of the reagent due to its gradual dilution with well fluid during operation, the lack of control over the output of the reagent, and the location of the container with chemistry under the dosing the pump makes it difficult to remove the chemical reagent, the inability to connect a telemetry system.

A device for the dosed supply of reagent to the well, a reagent tank and a metering pump connected with it with its own drive and control system, which are placed inside the well below the oil production equipment, the drive power of the metering pump is supplied by a battery of galvanic cells located in the sealed cavity of the device (RU 2446272, ЕВВ 37/06).

A disadvantage of the known design is that it is impossible to remotely control the flow of a chemical reagent, there is a need for hermetic isolation of the battery from the ingress of a chemical reagent and formation fluid, and this container must withstand large reservoir pressures, which also creates a risk of premature depressurization of a sealed cavity, it can also be attributed that the chemical reagent is located in a separate container, which is placed in an additional housing, which leads to smart the reduction of the useful volume of the chemical reagent, and as a consequence, the reduction of the dosage period of this device. It is also worth noting the impossibility of filling the specified installation with a chemical reagent through an external casing, which creates difficulties in the assembly of the dispenser and the inability to connect a telemetry system.

The closest analogue of the claimed technical solution is an intelligent submersible dispenser, consisting of a container with a piston and a fixed membrane, filled with a dosing composition, located in a tube-shaped housing, on one side of which there is an end piece and a sealed module with an electronic unit connected by an electrical conductor to an insulating sheath located in an airtight pipe and located on the other side of a controlled valve that is installed in the base and connected internally through channels with a receiving device having a fixed membrane piercer, the electronic unit receives power and a control signal via the neutral wire of the three-phase electric drive of the submersible pump and transfers it to the controlled valve (RU 115468, G01F 13/00, Е21В 37/06).

A disadvantage of the known design is that the chemical reagent is located in a separate container, which is placed in an additional housing, which leads to a decrease in the useful volume of the chemical reagent, and as a result, a reduction in the dosage period of this device, it is also seen from the figure that the electric wire passes between the outer case and the container body of the chemical reagent, which also increases the gap between the walls of the above buildings and, as a result, reduces the dosage period of this device ystva.

It is also worth noting the impossibility of filling the specified installation with a chemical reagent through an external casing, which creates difficulties in the assembly of the dispenser and the complexity of connecting the telemetry system. Also, when installing a telemetry system and its failure, it becomes impossible to operate a submersible chemical reagent dispenser.

SUMMARY OF THE INVENTION

The technical task set in the present invention is the implementation of continuous monitoring of pressure and temperature and vibration, increasing the life of the submersible batcher, increasing its reliability, as well as expanding its functionality.

The technical result of the claimed invention is to expand the functionality of the submersible dispenser of a chemical reagent.

The technical result of the claimed invention is achieved due to the fact that the submersible chemical reagent dispenser contains a cylindrical body, on one side of which a sealed module with an intelligent unit is installed, on the other hand, a base with a mixing chamber, with a controlled valve, with input and output channels communicated with a mixing chamber, while the intelligent unit is connected by an electrical conductor in an insulating shell located in a sealed pipe with a controlled valve, and The ternary module consists of a nipple and a flange connected by a casing; moreover, two channels are made in the nipple of the hermetic module, one of which has a temperature sensor hermetically mounted, the other has a hermetic pressure sensor, and a submersible motor temperature sensor is installed in the flange of the hermetic module, these sensors are electrically connected to the smart unit, while the smart unit is configured to control the insulation resistance and the temperature of the motor winding by connection to the motor winding through the neutral wire.

In the particular case of the implementation of the claimed invention, the intelligent unit is connected by a neutral wire of a three-phase electric drive of a submersible pump.

In the particular case of the implementation of the claimed invention, the cylindrical body is made of a corrosion-resistant material, for example stainless steel.

In the particular case of the implementation of the claimed invention, the cylindrical body is made of a corrosion-resistant composite material, for example, fiberglass or plastic.

In the particular case of the implementation of the claimed invention, the inner cavity of the cylindrical body is made with a corrosion-resistant coating

Brief Description of the Drawings

Details, features, and advantages of the present invention follow from the following description of embodiments of the claimed installation using the drawings, which show:

In FIG. 1 shows a chemical submersible dispenser

In the figure, the numbers indicate the following positions:

1 - base; 2 - container; 3 - nipple; 4 - pressure sensor; 5 - temperature sensor; 6 - smart block; 7 - cable; 8 - case; 9 - a flange; 10 - temperature sensor PED; 11 - a neutral wire; 12 - sealed connector; 13 - zero wire PED; 14 - cavity PED; 15 - housing PED; 16 - cable; 17 - sealed module; 18 - cable; 19 - cable; 20 - a separator; 21 - the electromagnetic valve; 22 - filling channel; 23 - channel; 24 - mixing chamber; 25 - inlet; 26 - outlet; 27 - channel; 28 - channel.

Disclosure of invention

Submersible chemical reagent dispenser (Fig. 1) is made in the form of a cylindrical container (8) filled with a chemical reagent and limited on one side by a sealed module (17), and on the other hand, by a base (1).

At the base (1) there is a mixing chamber (24) with inlet (25) and outlet (26) openings.

An electromagnetic valve (21) is installed in the base (1), the inlet of which is connected through a channel (23) made in the base (1) with a chemical reagent from the container (8), and the output is connected to the mixing chamber (24), in which dosing of a chemical reagent.

At the base (1), a filling channel (22) is made by means of which the container (8) is filled with a chemical reagent.

The housing (8) is connected to the nipple (3) and the flange (9) with the formation of a sealed module (17). An intelligent unit (6) is installed in the sealed module.

The smart block (6) is connected to the solenoid valve (21) using a cable (7) that tightly passes through the nipple (3), the container (2) and the base (1).

A channel (28) is made in the nipple (3), in which the temperature sensor (5) is sealed, and a channel (27), in which the pressure sensor (4) is sealed.

The temperature sensor (5) is connected to the smart unit (6) via a cable (18).

The pressure sensor (4) is connected to the smart unit (6) via a cable (19).

Inside the flange (9), a separator (20) is sealed, in which the connector (12) and the temperature sensor of the SEM (10) are sealed, the sensitive element of which is located in the oil-filled cavity of the SEM (14).

The flange (9) is attached to the PED body (15), inside of which there is a zero PED wire (13), which is connected to the smart block (6) through a sealed connector (12) and a neutral wire (11).

The temperature sensor of the SEM (10) is connected to the intelligent unit (6) via a cable (16).

Through the neutral wire of the PED (13), which is connected to the ground part by means of a power cable, the control signal is transmitted to the intelligent unit (6).

Due to the fact that the intelligent unit contains sensors of the temperature of the formation fluid, pressure of the formation fluid, temperature of the SEM, as well as the function of monitoring the insulation resistance and temperature of the motor winding, as well as the function of determining the level of vibration acceleration, it is possible to significantly expand the technical functionality of the submersible dispenser, to abandon the complex connection to existing telemetry systems, which makes the operation of the submersible batcher more stable, reliable and independent of the work of third-party lemetricheskoy system.

The device operates as follows.

At the factory or directly at the well before the launch, the container (2) is filled with a chemical reagent against corrosion, or salt formation, or paraffin formation through the filler channel (22). Before the descent into the well, the neutral wire (11) is connected to the neutral wire of the SEM (13) using a sealed connector (12), and using the flange (9) the submersible batcher is attached to the body of the SEM (15).

After the ground part of the smart block transmits a signal about the start of work via the zero voltage wire of the PEM (13), and then along the zero wire (11) to the smart block (6) located in the sealed module (17), the immersion part of the smart block will give a signal wire (7) to the solenoid valve (21) to open / close it. The chemical reagent from the container (2) enters the channel (23) into the electromagnetic valve (21), and in the case of its open state, into the mixing chamber (24) located in the base (1).

Formation fluid enters the mixing chamber (24) through the inlet (25), which, mixed with the chemical reagent entering the chamber through the solenoid valve (21), is taken out of the mixing chamber through the outlet (26) and then flows into the mixing chamber oil production pump, thereby fully protecting all submersible equipment, including the submersible motor, from salt formation, paraffin formation and corrosion.

During operation of the submersible dispenser, a temperature sensor (5), sealed in the nipple (3) and connected to the reservoir fluid, receives a signal through the channel (28) to the intelligent unit (6), where it is processed and amplified, and then through zero PED wire (13) the signal is transmitted to the ground intelligent unit.

During operation of the submersible batcher from the pressure sensor (4), hermetically installed in the nipple (3) and connected to the reservoir fluid, a signal is transmitted through the channel (27) to the intelligent unit (6) where it is processed and amplified, and then through the neutral wire PED (13) signal is transmitted to the ground intelligent unit.

During operation of the submersible batcher, a temperature sensor (10) sealed in the separator (20) and connected to the oil-filled cavity of the PED (14) receives a signal through the cable (16) to the smart unit (6), where it is processed and amplified, and then, through the neutral wire of the PEM (13), the signal is transmitted to the ground intelligent unit.

During operation of the submersible batcher, the intelligent unit (6) is constantly connected to the motor winding through the neutral wire of the PEM (13), which allows the function of monitoring the insulation resistance and temperature of the motor winding to be implemented.

The technical solutions presented, namely: the inclusion of the telemetry system functions in an intelligent unit, the use of a reservoir fluid temperature sensor, reservoir fluid pressure, PEM temperature as part of a chemical metering unit, as well as the function of monitoring the insulation resistance and temperature of the motor winding, as well as the function determining the level of vibration acceleration, - can significantly improve the reliability of the equipment due to the fact that all the functions of the TMS are included in submersible doses The chemical reagent, as well as the placement of the TMS unit in a liquid-filled chamber, makes it possible to equalize the pressure inside and outside, and also due to the use of silicone fluid, the reliability of short circuits and breakdown along the circuit board path and in the solder points of the connecting wires increases. This technical solution also allows you to significantly expand the technical functionality of the submersible dispenser, to abandon the complex connection to existing telemetry systems, which makes the work of the submersible dispenser more stable, reliable and independent of the operation of a third-party telemetry system.

Claims (8)

1. A submersible chemical reagent dispenser containing a cylindrical body, on one side of which a sealed module with an intelligent unit is installed, on the other hand, a base with a mixing chamber, with a controlled valve, with input and output channels in communication with the mixing chamber is installed, while the intelligent unit connected by an electrical conductor in an insulating shell located in a sealed pipe with a controlled valve, and the sealed module consists of a nipple and a flange connected by a housing, characterized in that two channels are made in the nipple of the hermetic module, in one of which the temperature sensor is hermetically mounted, and in the other the pressure sensor is hermetically installed, and in the flange of the hermetic module there is a temperature sensor of the submersible motor, while these sensors are electrically connected to the smart unit wherein the intelligent unit is configured to control the insulation resistance and temperature of the motor winding by connecting to the motor winding through a neutral wire. 2. The dispenser according to claim 1, characterized in that the intelligent unit is connected by a neutral wire of a three-phase electric drive of a submersible pump. 3. The dispenser according to claim 1, characterized in that the cylindrical body is made of a corrosion-resistant material, for example stainless steel. 4. The dispenser according to claim 1, characterized in that the cylindrical body is made of a corrosion-resistant composite material, for example fiberglass or plastic. 5. The dispenser according to claim 1, characterized in that the inner cavity of the cylindrical body is made with a corrosion-resistant coating.

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