RU2329372C2 - Reconditioning unit of well screen (versions) - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: unit contains a submersible pumping unit fixed on a lift pipe, a percussive exciter of screen reconditioning fitted with a container of residue harvesting, a submersible short-circuit motor, a cable, a rope, a spring hanger and skids. The percussive exciter of screen reconditioning is made in the form of a balance weight located on a flexible shaft, which is connected by means of flanged joint with a longish lower end of the motor rotor shaft. The electric motor is linked to a variable frequency drive located at the mouth of a well and connected thereto by means of a cable. The variable frequency drive is capable of controlling rotary speed of the balance weight ensuring resonance oscillations of exciter-screen string system. Alternatively, the exciter can be made in the form of a camshaft connected with its lower end to a clutch installed in plain bearings with spring-actuated thrusters. The latter are arranged inside the housing; a container of residue harvesting is installed above. Additionally, a container of residue harvesting equipped with blade-type mill is arranged under the electric motor.

EFFECT: increased output of a well and enhanced level of screen reconditioning.

2 cl, 8 dwg

Description

The invention relates to the operation and construction of wells and is intended to increase their productivity and development of new wells.

A well-known close analogue to the claimed solution is a shock-vibration projectile ГВС-1 of horizontal vibrational action for releasing pipes in the sticking zone of drill strings during construction or liquidation of wells, comprising a housing, unbalance, gearbox, shafts, bearings, oil bath, cable, electric motor, cable and fastening (see, for example, pp. 19-21, table 1 and fig. 3, the journal “Water supply and sanitary equipment”, No. 7, 1989).

The disadvantage of this device is the design complexity, large metal consumption, the ability to change the mass of the unbalance, the lack of effective mechanical shock loads, the lack of regulation of speed, frequency and amplitude of oscillations to create resonant vibrations of the system and maximum mechanical displacements of the filter dust.

Also known is a vibration installation for regeneration of collimated well filters, containing a surface vibration unit at the wellhead, a production string of pipes, a string of pump and compressor pipes, a working body with discs and hoses with pipes for water drainage and air supply (see pages 224, 225, fig. .112, 113, M.G. Zeitlin, V.V. Verstov, G.G. Azbel "Vibration technique and technology in pile and drilling operations", ed. Leningrad, Stroyizdat, 1987).

However, the hydrodynamic treatment of operating wells that have been sedimented with various sediments is carried out only after dismantling and lifting the production pump, pipes and cleaning the wellbore, which is associated with high labor costs and low regeneration efficiency due to the passivity of the regeneration method, which gives only up to 60-70% of the initial productivity , and also with a short term of the achieved effect, which is from 1.5 to 6 months of well operation until a subsequent decrease in its productivity.

Also known is a hydraulic vibrator for oil wells, comprising a housing, a sleeve, a spring, a plug, an airtight cavity of a spring, a power pump and high pressure pipelines (see, for example, RF patent No. 2197598).

However, this vibrator is complex in design, material intensive, energy intensive and inefficient.

Also known is a hydrodynamic pressure pulsator for cleaning the bottomhole formation zone and increasing well productivity, comprising a housing with windows, a spring, a saddle, a shut-off element in the form of a piston and an energy accumulator with pipelines (see, for example, RF patent No. 2212513).

However, this pulsator is material-intensive, energy-intensive, complex in design and ineffective.

Close to the claimed device is also a method of maintaining reservoir pressure in oil fields, which includes a well, a water conduit, a hydraulic vibrator, wellhead equipment, a borehole pipe string, water and a power pump (see, for example, RF patent No. 2221116).

However, this method is time-consuming, energy-intensive, material-intensive and inefficient.

Closest to the claimed is a vibration exciter containing a short-circuited electric motor with a cable, cable, spring suspension (see patent RU 2190064).

However, this shock-vibration unit of double-acting is aimed at creating strokes parallel to the longitudinal axis of the well, which is ineffective for regenerating dusting filters.

The invention consists in the following.

1. The device according to option 1 is made in the form of a mechanical shock-vibration exciter of horizontal action with a flexible shaft and unbalance, combined through a flange connection of the elongated end of the shaft of the rotor of a submersible electric motor.

2. For fixing in the wellbore, the submersible motor housing is equipped with spring slides on the side, and on top - a spring suspension with a cable for attaching to the working pump and cable.

3. To achieve a maximum amplitude of filter oscillations of 5-6 mm to the side, the output cable of the electric motor at the wellhead is equipped with a frequency converter that outputs the well-shock-vibration exciter system to resonant vibrations, creating maximum turbidity in the water pumped out by the pump.

4. To exclude subsequent pumps after dismantling and cleaning sedimentation tanks (sand, sludge, clay), a container for collecting sludge in the process of regeneration and water removal was made on the drive cable of the pathogen.

5. For various filters of different reservoir properties of oil reservoirs and properties of aquifers, the shock-vibration exciter is equipped with a replaceable mass of unbalances.

According to option 2, the device contains

1. A rotating container with screws located at the bottom of the electric motor for removing sediment from the well sump with entrance sludge windows, cutting mills, and elastic valves in the lower container lid.

2. For simultaneous cleaning of the well sump and regeneration of the annular space of the filter when the pump is disassembled, a drive shaft with eccentric cams located in the housing on sliding bearings equipped with spring-loaded shock pushers is made on the upper end of the rotor shaft over the drive of the device.

3. To fix the device in the wellbore and reduce the level of harmful vibrations transmitted to the pump unit from the shock-vibration exciter, suspended from below, it is ensured that spring rails and a spring suspension of the cam housing with a cable are placed on the drive housing of the exciter.

4. A sediment collection container placed on the suspension cable above the pathogen drive ensures that sediment enters it during the operation of the shock-vibration pathogen, eliminating its entry into the well sump.

A single technical result in the implementation of the group of inventions according to option 1 consists of:

in increasing the vibration level of the filter column and improving the contact of the working body with the environment,

in the destruction of the structural lattice of the clogging formations and their adhesion forces,

in localization of the impact of the continuous process of mudding and filter zones and the outer surface of the filter pipe,

to a high degree of processability of the process with its multiple execution without harmful effects on the structural elements of the structure,

in many times reducing filter regeneration time and reducing labor intensity,

in a multiple increase in the life cycle of the well and maintaining its productivity,

Due to the automation of the filter regeneration processes, the functions of water intakes and classical treatment facilities are combined.

According to option 2, the technical result consists of:

in combining the regeneration processes of the filter zones with the collection and removal of sludge and cleaning the filter sumps at the same time,

a high degree of processability of the process with its multiple implementation and harmless impact on the structural elements of the structure,

in localization of environmental impact on the environment, excluding acid treatment of wells,

in multiple reduction of filter regeneration time and reduction of labor intensity.

The technical task is the automation and long-term maintenance of the productivity of existing wells and increasing it in new ones, by increasing the degree of regeneration of the annular space of the filter by impact (mechanical vibrations), by adjusting the frequency and amplitude of the object’s vibrations as a whole and reaching maximum resonant vibrations (up to 5-6 mm ) to the side and maximum turbidity of the pumped water. It is possible to use a pathogen whose static moment of unbalance mass is not less than 0.6 kg · m, driving force of 10 kN and power of 3.7 kW (see p. 114, M.G. Tseitlin, V.V. Verstov, G.G. .Azbel. "Vibration equipment and technology in pile and drilling operations", ed. Leningrad, Stroyizdat, 1987).

The technical result (option 1) is achieved by the fact that in the device (Fig. 1, 2), including a submersible motor 1 on the cable 8, on the shaft 6 and flange 2 of which there is a vibration exciter containing a steel flange 3, flexible shaft 4, unbalance 5, the drive of which is carried out through a frequency converter 15, at the wellhead through cable 14, thereby achieving resonance vibrations of the well-exciter system, and through a water-lifting pipe 12, water is pumped with pump 9 with maximum turbidity.

The technical result (option 2), achieved by the fact that in the device (Fig. 3, 8), including a submersible motor 1, at its lower end is made using flanges 3 a rotating sediment removal container 16 with screws 24 and sediment entry windows 22 located in its lower cover 20, with cutting mills 21 and elastic valves 23. The shock-vibration exciter on top is also equipped with a container for collecting sediment 34 coming from the annulus during operation of the vibration exciter, which contains a cam shaft 28 with spring-loaded pushers 30.

The combination of the characteristics of the device listed in the claims makes it possible to efficiently regenerate the filters of any wells, since it is subjected not only to the most effective mechanical of all types of vibrations of the annular filling and sprinkling, but also to the horizontal axis directed normally to the axis in the lower part of the filter, in the zone of maximum water loss layer.

The drawings show a device of the claimed invention, where Fig. 1 is a general view of a vibration exciter device in a well sump; figure 2 - fragments of the pathogen; figure 3 is a design option for the simultaneous cleaning of the sump and the regeneration of the filter space; figure 4 is a General view of the cam drive shaft; figure 5 - the upper part of the fragments of the cam pathogen with a drive; figure 6 - spring-loaded pusher; 7 is a view of the bottom cover of the sediment container with cutters; in Fig.8 is a fragment of the lower part of the sediment container.

The device according to option 1 contains (FIGS. 1, 2) a submersible motor 1 with a mounting flange 2, with bolts 27, an exciter flange 3, a flexible shaft 4, an unbalance 5, a spring slide 26, a spring suspension 7, a cable 8, a cable14 and a frequency converter 15 (at the wellhead), and in the well 13, the pathogen is placed coaxially under the submersible pump unit 9, on the pipe 12, in the sump 10, under the filter 11 in the production pipe string 13, with a sediment collection container.

According to option 2 of the wells already in operation (Figs. 3, 4, 5, 6, 7, 8), the device comprises a submersible motor 1 with a cable 14 at the upper end of the shaft of its rotor 6, a coupling 33 connected to the lower end of the cam shaft 28, the exciter with springs 31, pusher 30, in housing 35, with sliding bearings 32, spring suspension 7, cable 8. Housing 1 of the electric motor for centering in the well contains spring slide 26, and at its lower elongated end on flange 2 of rotor 6, through flange 17, a sludge removal container 16 is placed with screws inside 24, windows 18 are removed Nia sediment top and bottom shell 19, placed above it with the cutting cutters 21, windows 22, bottom cover 20, the elastic flaps 23. For the accumulation of sediment in the filter regeneration periods unit is also provided with a hopper 34, sludge accumulation.

The device operates as follows in option 1.

To regenerate the filter space (Fig. 1) through the converter 15, changing the number of revolutions of the electric motor 1, voltage 14 is applied to the submersible electric motor 1 through the cable 14, causing the exciter to rotate through the flange 3, flexible shaft 4, unbalance 5, and create a different frequency and amplitude of oscillations filter columns and at the same time turn on the submersible pump 9 located on the water pipe 12, and close the network valve of the well, simultaneously opening the mud valve (not shown), and upon reaching the maximum turbidity of the pumped water We determine the resonance vibrations of the entire system (pathogen - filter column), where after 3-5 minutes there is a sharp decrease in the turbidity of the pumped water, which corresponds to the moment of restoration of the permeability of the filter and the bottomhole zone, as in the process of vibration “boiling” of loose material sprinkling the filters and there is a weakening of the adhesion forces between the particles, they either approach or move away from each other, destroying the crystal lattice of the Kolmatant (especially there is a need for the non-perforated part of the filter). On the one hand, the number of pores increases and, accordingly, the productivity of the well, and on the other hand, sprinkling is compacted, covering part of large cavities, excluding sanding of the well. Intensively during this period, the colmatant entering the well 13 through the filter 11 precipitates into the sediment accumulation hopper 34 located on the cable 8 without getting to the bottom of the settling tank 10. An assembly unit (see Fig. 2, pos. 3, 4, 5) is possible interchangeable in weight when mounting the pathogen.

In option 2, the device operates as follows. To clean the sump of existing wells (Figs. 1, 3, 4, 5, 6, 7, 8), a cam exciter is included in the housing 35 (in a known manner), located above the electric motor 1, through its rotor 6 and clutch 32, rotates the shaft 28 with a cam 29 in sliding bearings 32, moving spring-loaded pushers 30 in the housing 35, which perform reciprocating movements and shock on the inner wall of the settling tank 10 of the filter column 11, as a result of which the sediment intensively entering the settling tank first enters the hopper 34 , where it is compacted, moving away during dismantling. For simultaneous cleaning of sedimentation tank 10 from sediment 25, the exciter motor 1 rotates the sediment container 16 with screws 24 and the sediment moved by them enters through the shell 19, bottom cover 20, cutting mills 21, sediment inlet windows 22, with elastic valves 23. Cleaning the container at the wellhead carried out through sludge removal windows 18. In this embodiment, a working submersible pump is not used.

When regenerating a well filter. The shock-vibration mode of processing the wells by the device is technologically advanced, it allows a wide range of adjusting the duration and intensity of processing of the filter zones, makes it possible to combine mechanical, dynamic and chemical effects on the mud, provides with the help of a vibrating working body any necessary change in the frequency and amplitude of the oscillations, varying the mass at change of the slider and revolutions of unbalance before its installation, which ensures the effective flow of fine dust-like fractions of the mechanical and other colmatant due to the pressure difference in the barrel and the borehole wall.

Claims (2)

1. A device for regenerating well filters, comprising a submersible pumping unit located on a water pipe, a shock-vibration exciter for regenerating filters, including a short-circuited submersible electric motor with a cable, cable, and spring suspension, characterized in that the shock-vibration exciter is equipped with a filter cake sediment collecting container of space, the electric motor is equipped with spring slides and is connected to a frequency converter located at the wellhead and connected to it through a cable And shock vibration exciter is designed as a unbalanced mass disposed on a flexible shaft, which is connected by means of a flanged connection with the elongate lower end of the shaft of the motor rotor, the inverter configured to control a number of the unbalance revolutions ensuring resonant oscillations exciter system - of filters column. 2. A device for regeneration of well filters during the development of new wells and periodic regeneration of filters, cleaning sumps and collecting sludge in existing wells at the same time, containing a shock-vibration exciter of filter regeneration, including a short-circuit immersed electric motor with cable, cable, spring suspension, characterized in that the electric motor is equipped with a frequency converter located at the wellhead and connected to it through a cable, spring slides and a rotor at the upper end of the shaft and the coupling, and the shock-vibration exciter of the regeneration of the filters is made in the form of a cam shaft connected to the lower end with a clutch installed in sliding bearings with spring-loaded followers located in the housing, above which there is a container for collecting sediment of the filter space, and the container is rotatable below the motor removing sediment from the well sump with cutting mills and elastic valves located in the inlet windows of the bottom cover of the container and the screws inside it.

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