RU2735882C1 - Downhole filter cleaning device - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry. Device for cleaning a downhole filter includes a surface control unit and a downhole portion of the device, comprising a brush unit with a unit drive and an oscillation generator mounted in a sealed housing, and a means of delivering to the bottomhole of the well and supplying electric power, wherein the geophysical cable is used as the delivery and power supply means. Control unit is made in the form of a system unit with a monitor, and in the downhole part of the device there is a fixing unit, a block of brushes, downhole sensors and a downhole sensor controller, to the input of which they are connected and which output is connected via geophysical cable with system unit, and well control controller connected by well control line and geophysical cable to control controller is installed.

EFFECT: control of device position and cleaning parameters and control of cleaning process.

8 cl, 4 dwg

Description

The invention relates to the oil and gas industry.

Known acoustic method decolmatation filter using magnetostrictive or piezoelectric emitters of ultrasonic vibrations (see the book. "Recovery of the flow rate of water wells" M .: Agropromizdat, 1987, Authors B.C. Alekseev, V.G. Grebennikov. P. 156). The method has a wide spectrum of frequencies of the emitted vibrations, the ability to generate a high-energy cavitation flow of liquid, which allows destruction of bridging agents of various types. In addition, when ultrasonic vibrations are generated in a liquid medium, there is an effect of its disinfection and suppression of the development of biological organisms. The disadvantage of this method is that its application requires the dismantling of the water-lifting equipment every time the well productivity decreases to a critical level.

The known method and device for regular cleaning of the near-filter zone of vertical wells without dismantling the water-lifting equipment according to RF patent No. 2612046. The device contains an acoustic emitter and its delivery means in the form of lift equipment, which are located inside the filter space and are connected, respectively, by an electrical connection cable with the lift equipment control panel and a generator of high-frequency electrical oscillations. The control panel and the generator of electrical oscillations are located on the ground. The lift equipment is fixed on the lower part of the submersible pump and produces a reciprocating movement (up-down and back) of the acoustic emitter along the axis of the downhole filter.

The acoustic radiator consists of a chain of interconnected sectors (blocks) located along the filter axis and made of sealed cylindrical housings, the symmetry axes of which are perpendicular to the filter axis. In the body of each unit, two ultrasonic oscillatory systems are installed, the operation of which is based on the use of piezoelectric (piezoceramic) or magnetostrictive converters of electrical vibrations into mechanical ones. The working surfaces of the waveguides-instruments (sources of ultrasonic vibrations) are directed in opposite directions to the inner surface of the filter. Axles. the symmetries of the blocks relative to each other are located at an angle equal to a multiple of dividing 180 ° by their number (like a circular fan). Depending on the size of the projection of the ultrasonic flow (from one source), such a number of blocks are installed on the inner surface of the filter, at which the total ultrasonic flow (from all sources), when moving the acoustic emitter, affects the entire inner surface of the filter. A chain of blocks in the form of a garland is fixed along the filter axis using two fan-shaped sets of flexible centralizer rods located perpendicular to the filter axis in the upper and lower parts of the garland.

The disadvantage of this acoustic emitter is that with small dimensions of the inner diameter of the borehole filter, it is possible to use only small-sized ultrasonic oscillatory systems with limited dimensions of the working surface of the waveguide-tool. Such sources of ultrasonic vibrations have small dimensions of the projection of the ultrasonic flow onto the filter; therefore, a large number of ultrasonic transducers are required, which significantly complicates the design of the acoustic emitter.

Known device for cleaning the well filter according to RF patent No. 2672074, IPC E21B 37/08, publ. 11/09/2018, prototype.

This device contains one unit of ultrasonic transducers, base plates, a rotation unit and an electric motor are installed above and below the unit. The device has the form of a garland of the following elements connected in series: an upper base plate, a rotation unit, a unit of ultrasonic transducers, an electric motor and a lower base plate. The base plates are located perpendicular to the filter axis and have flexible centralizing rods around the perimeter. With the help of an electric motor, rotational oscillations of the unit are produced at an angle equal to 180 °, like a clock pendulum, while ultrasonic liquid flows from the working surfaces of the waveguides-instruments scan the inner surface of the filter along the entire circumference of the filter by 360 °. Simultaneously with this process, using the delivery means, reciprocating movements of the acoustic emitter along the filter axis are carried out. Thus, they provide consistent treatment of the entire inner surface of the well filter with directed ultrasonic fluid flows and regular cleaning of the near-filter zone of the well without dismantling the water-lifting equipment.

As an ultrasonic transducer, an ultrasonic vibrating system with a large vibration amplitude is used, as described in RF patent No. 2465071. The design of the oscillating system has the shape of a body of revolution and consists of at least two disk piezoelectric elements located between the reflective and concentrating pad with a waveguide-tool at the end in the shape of a disk. Piezoelectric elements and overlays are placed in a cylindrical glass with threaded ties at the ends. When electric pulses are applied to the piezoelectric elements, mechanical ultrasonic vibrations are formed, which are transmitted through the concentrating pad to the working surface of the waveguide-instrument.

Disadvantages: lack of control over the operation of the device, cleaning performance and effective management of the cleaning process.

The task of creating the invention: providing visual control of the position of the device and ensuring control and management of the cleaning process.

The achieved technical result: ensuring control of the position of the device of operating parameters and effective control of the cleaning process.

The solution to these problems has been achieved in a device for cleaning a downhole filter, including a control unit on the surface, and a downhole part of the device containing a brush unit with a drive unit and an oscillator installed in a sealed housing and a means for delivering to the bottom of the well and supplying electricity, while the means for delivering and supplying electricity use a geophysical cable, in that the control unit is made in the form of a system unit with a monitor, and a fixing unit, a brush unit, downhole sensors and a downhole sensor controller are installed in the downhole part of the device, to which they are connected, and the output which is connected through a geophysical cable to the system unit, and a downhole control controller is installed, connected by a downhole control line and a geophysical cable to the control controller.

The brush block can be made in the form of brushes in the form of a sector with a wire, and a holder in which an oblong-shaped hole is made through which a cylindrical hinge passes, the brush block contains radial rods installed inside the cylinders and having stops, springs are installed concentrically to the radial rods, abutting in stops and holders.

An ultrasonic generator can be used as a vibration generator.

A vibrator can be used as an oscillator.

The geophysical cable can be connected via a cable lug to the oscillator, the drive of the brush unit and the fixation unit.

The hermetically sealed body can be made with a pressure and thermal expansion compensator.

The unit of brushes can be configured to create rotational and oscillatory movements.

A modem can be installed on the surface, connected to the system unit and the Internet.

The essence of the invention is illustrated in the drawings (Fig. 1 ... 4), where:

- in Fig. 1 shows a general diagram of a downhole filter cleaning device, including a surface part and a downhole part.

- in Fig. 2 shows the downhole part of the device, the first option,

- in Fig. 3 shows a diagram of measurement and control,

- in Fig. 4 is a drawing of a brush unit.

List of designations used in the description.

1.casing 1

2.borehole filter 2,

3.productive layer 3,

4.perforated pipe 4.

5.filter element 5,

6. the downhole part of the device 6,

7.sealed enclosure 7,

8. oscillator 8,

9.delivery system 9,

10.cable lug 10,

11.geophysical cable 11,

12.coil 12.

13.system unit 13,

14.electric connection 14,

15.power supply 15,

16.monitor 16,

17. cable length measurement sensor 17,

18.surface 18,

19.drive 19,

20. drive switch 20,

21.brake 21,

22.brake switch 22,

23.controller 23,

24.Upper sensor controller 24,

25. block of brushes 25,

26. shaft 26,

27. brush drive 27,

28. pressure and thermal expansion compensator 28,

29.acoustic emitter 29,

30.brush speed sensor 30,

31. vibration amplitude sensor 31,

32. vibration frequency sensor 32,

33. downhole sensor controller 33,

34. downhole control controller 34,

35.Borehole control wires 35,

36.borehole power cables 36,

37.Borehole Communications Measurement 37,

38. block fixation 38,

39. clips 39,

40. modem 40,

41. Internet 41,

42 brushes 42,

43.Sector 43,

44.wire 44,

45. holder 45,

46.hole 46,

47.cylindrical joint 47,

48. radial rod 48,

49. cylinder 49,

50. emphasis 50,

51.spring 51.

FIG. 1 shows a schematic diagram of a device for cleaning a downhole filter. It is intended for running into the casing 1 inside the well filter 2 installed in the productive formation 3 to clean the well filter 2 during clogging with acoustic or mechanical vibrations, such as sound, ultrasound, vibration, or a combination of these types of vibrations.

The downhole filter 2, as a rule, is made in the form of a perforated pipe 4 with a filtering element 5. The filtering element 5 can be mesh, slotted or porous material. During operation, the filter element 5 is clogged (clogging occurs) with foreign particles, as a result of which the flow rate of the well decreases sharply.

The device contains the downhole part of the device 6.

The main version of the device (Fig. 1) contains, installed downhole part of the device 6 in a sealed housing 7, an oscillation generator 8 and a delivery device 9. The device has a cable tip 10 at one of its ends, to which a geophysical cable 11 is connected.

In the main version, a geophysical cable is used as a delivery vehicle. Geophysical cable 11 is wound on a coil 12 and is connected to a control unit, the role of which is played by a system unit 13, to which, in turn, a power supply source 15 is connected by electrical connections 14 - a battery or an electrical network and a monitor 16. A measurement sensor is installed on the geophysical cable 11 cable length 17.

The device contains on the surface 18 a system unit 13 and a monitor 16 for monitoring the position of the oscillator 8 and the parameters of the cleaning process and their control.

Geophysical cable 11 is used to deliver the bottom-hole part of the device 6 and supply electricity to it and take downhole parameters.

Ground equipment on the surface 18 contains a coil 12 with a drive 19 and a drive switch 20, a brake 21 and a brake switch 22. The drive switch 20 and a brake switch 22 are connected to the control controller 23. The device contains an upper sensor controller 24, to the input of which a geophysical cable 11 is connected , and to the exit the system unit 13.

The downhole part of the device 6 contains a block of brushes 25, made with the possibility of rotation in the opposite direction. The block of brushes 25 is connected by a shaft 26 to a brush drive 27 installed in a sealed housing 7.

The drive of the brushes 27 is made with the possibility of creating a rotational movement for the shaft 26 and at the same time a reciprocating movement.

The sealed body 7 is filled with a lubricant. Inside the sealed housing 7 is made a compensator of pressure and temperature expansion 28 (Fig. 2 ... 4). The compensator of pressure and thermal expansion 28 is designed to compensate for different coefficients of thermal expansion of the metal from which the bodies are made and the lubricating liquid, as well as to prevent collapse of the sealed body by high pressure acting in the well. The hydrostatic pressure in the well can reach, depending on its depth, 60 ... 80 MPa. In addition, the pressure and thermal expansion compensator 28 compensates for the flow rate of the lubricating fluid and prevents environmental components from entering the lubricating fluid.

The vibration generator 8 is also installed inside the sealed housing 7. An ultrasonic generator, a vibrator, etc. can be used as a vibration generator 8. Acoustic emitters 29 are radially docked to the oscillator 8.

The device for cleaning the downhole filter contains (Fig. 2) downhole sensors, including a brush speed sensor 30, a vibration amplitude sensor 31 and a vibration frequency 32, connected to a downhole sensor controller 33 installed in a sealed housing 7 and connected to a geophysical cable 11 ...

In the sealed housing 7, a downhole control controller 34 is also installed, to which downhole control wires 35 are connected, and downhole power cables 36 are connected to all equipment inside the downhole part of the device 6. Downhole measurement connections 37 connect sensors 30 ... 32 with a downhole sensor controller 33,

The device may contain a fixation block 38 with fixators 39 installed radially for temporary fixation inside the well screen 2 (Fig. 2). The electrical connection diagram of the downhole part of the device 6 is shown in FIG. 3.

One of the ports of the system unit 13 can be connected to a modem 40 connected to the Internet 41 (Fig. 1) for remote monitoring and control of cleaning.

FIG. 4 shows a drawing of a block of brushes 25. The block of brushes 25 contains: brushes 42 in the form of a sector 43 with a steel wire 44 (in the form of segments) and a holder 45, in which an oblong-shaped hole 46 is made, through which a cylindrical hinge 47 passes for connection with radial rods 48.

Radial rods 48 (from 3 to 12 pcs.) Are installed in cylinders 40. A stop 49 is made on each radial rod 48. Radial rods 48 are installed in cylinders 50 and a spring 50 is installed concentrically to them. The springs 50 rest against stops 49 with one end and the other in holders 45.

Operation of the device (Fig. 1 ... 4).

After long-term operation of the well as a result of clogging of the well filter 2, the production rate of the produced product sharply decreases. The downhole part of the device 6 is lowered into the casing string 1 on a geophysical cable 11. The vertical section of the wellbore device passes under the action of gravity, while the geophysical cable 11 is unwound from the reel 12, and the cable length sensor 17 determines the depth to which the downhole part of the device 6 is lowered. Along the horizontal section of the well or along the section with a slope of less than 5 ... 7 degrees, it is impossible to move the device without external forces. For this, known delivery vehicles can be used, for example, those known from US Pat. RF No. 2392178, IPC E21B 37/08, publ. September 27, 2009

When the downhole part of the device 6 enters into the downhole filter 2 (the first of the downhole filters, if there are several of them installed), the fixation unit 38 is switched on from the system unit 13 and the latches 39 are extended to prevent further movement of the downhole part of the device 6 during the cleaning of the current section of the downhole filter 2

An oscillation generator 8 is turned on, which, by means of acoustic emitters 29, directs the energy of acoustic vibrations radially with respect to the filter element 5. The acoustic or vibration effect on the filter element 5 causes the detachment of solid particles clogging the filter cells or slots.

Simultaneously, the brush drive 27 is turned on and the brush unit 25 is activated. The brushes 42 (Fig. 4) perform a rotational movement and simultaneously an axial reciprocating movement of 3 ... 5 mm. One section of the downhole filter 2 is cleaned, then the locks 39 of the fixation block 38 are unlocked and the downhole part of the device 6 is moved even further by 3 ... 5 mm. This process is repeated many times. As a result, the well screen 2 is completely cleaned.

The position of the bottom-hole part of the device 6 in the well and the connection to the installation interval of the downhole filters 2 are roughly determined using the cable length sensor 17.

It became possible to provide operational control of the device for cleaning the well filter, by changing the operating parameters monitored by sensors 17, 30, 31 and 32 and based on the results of monitoring

The sensors 30, 31 and 32 transmit information to the downhole sensor controller 33 and then through the downhole measurement connection 37 and the geophysical cable 11 to the upper sensor controller 24 and then to the system unit 13.

The system unit 13 generates and transmits information to the control controller 23, and then to the drive switch 20, connected to the drive 19, to unwind the coil 12 with the geophysical cable 11, and to the third - the brake switch 22 to turn on or off the brake 21 of the coil 12 ( Fig. 1).

Using the information received from the sensors 30, 31 and 32, the system unit 13, according to a predetermined program, generates signals to correct the operation of the oscillator 8 and the brush drive 27. This signal is fed through the control controller 23 and the geophysical cable 11 to the downhole control controller 34 and further to oscillator 8 and brush drive 27.

After cleaning, the brush drive 27 and the oscillator 8 are disconnected from the system unit 13. The fixation unit 38 is unlocked. By winding the geophysical cable 11 onto the spool 12, the downhole part of the device 6 is removed from the well. The well is put into operation again.

The block of brushes 25 contains (Fig. 4): brushes 42 in the form of a sector 43 with a wire 44, and a holder 45, in which an oblong-shaped hole 46 is made, for changing the diameter D _u from the action of centrifugal forces, through which a cylindrical hinge 47 passes. brushes 25 has radial rods 48 installed inside cylinders 49 and having stops 50. Springs 45 are installed concentrically to radial rods 48. Springs 45 create pressure on brushes 42 for their effective operation and compensate for fluctuations in the inner diameter of the well screen 2 within tolerances and due to colmatation.

The delivery of the oscillation generator 8 inside the well filter 2 installed on the horizontal section of the well can be performed using a tubing string (tubing) or a transport string or using rods (such options are not shown in Figs. 1 ... 4.)

If necessary, information on the cleaning process of the well filter can be transmitted via modem 40 (Fig. 1) using the Internet 41 over a considerable distance and used for monitoring or control.

Application of the proposed technical solution allowed:

1. Provide fully automated and high-quality cleaning of the well filter from mechanical deposits, including internal surfaces, due to the simultaneous use of mechanical and vibroacoustic cleaning.

2. Ensure accurate delivery of the device to the well screen.

3. Prevent the twisting of the geophysical cable due to the rotation of the brush unit by using the fixing unit.

4. Ensure operational control of the operation of the device for cleaning the downhole filter by monitoring the well parameters and automatically or manually changing the operating parameters of the brush unit and oscillator based on the results of monitoring the downhole parameters on the monitor screen.

Claims (8)

1. A device for cleaning a well filter, including a control unit on the surface and a downhole part of the device, containing a brush unit with a drive unit and an oscillator installed in a sealed housing, and a means for delivering to the bottom of the well and supplying electricity, while serving as a delivery means and a geophysical cable is used to supply electricity, characterized in that the control unit is made in the form of a system unit with a monitor, and a fixing unit, a brush unit, downhole sensors and a downhole sensor controller are installed in the downhole part of the device, to the input of which they are connected and the output of which is connected through a geophysical cable with a system unit, as well as a downhole control controller connected to a downhole control line and a geophysical cable with a control controller. 2. The device according to claim 1, characterized in that the unit of brushes is made in the form of brushes in the form of a sector with a wire and a holder, in which an oblong-shaped hole is made through which a cylindrical hinge passes, the unit of brushes contains radial rods installed inside the cylinders and having stops, springs are installed concentrically with radial rods, abutting against stops and holders. 3. The device according to claim 1, characterized in that an ultrasonic generator is used as an oscillator. 4. A device according to claim 1, characterized in that a vibrator is used as the oscillator. 5. The device according to claim 1, characterized in that the geophysical cable is connected through a cable lug to the oscillator, the drive of the brush unit and the fixation unit. 6. The device according to claim 1, characterized in that the sealed body is made with a pressure and thermal expansion compensator. 7. The device according to claim. 1, characterized in that the unit of brushes is configured to create rotational and oscillatory movements. 8. The device according to claim 1, which is different. that a modem is installed on the surface, connected to the system unit and the Internet.

Images