Method of fitting well screen in horizontal steam-injection well

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of a horizontal well, running in of a production casing with a well screen with shear plugs in openings, and packers. In the drilling process permeability properties are defined, the borehole is divided into zones having the permeability properties differentiating per 1.5-1.6 times, a flow area of the screen openings and a number of openings for each zone is selected. At the mouth the well screen is equipped with a shear funnel and water-swellable packers from the outside, the string is run in into the well and the well screen is fitted so that the water-swellable packers are within boundaries of the formation zones with different properties. The hole is lined, and the following layout is assembled at the mouth: a fishing magnet, a pusher, a rigid centraliser with overflow channels. The assembly is run in to the well until the pusher is rested on the shear funnel, the string is slacked off, and the shear funnel is moved until it rests on the first row of the shear plugs, the string is slacked off completely to the funnel and the first row of the shear plugs is destroyed. The string is moved from the mouth to the bottomhole and the next row of the shear plugs is destroyed and fixed by the fishing magnet. The string is slacked off completely to the funnel again and the remaining rows of plugs are destroyed, the pipe string is run out with the assembly. Openings are isolated in the lower perimeter of the well screen.

EFFECT: improved quality of the formation drilling, reduced time for the well screen fitting.

4 dwg

 

The invention relates to the field of development of high viscosity oil and can be used for opening the productive strata steam horizontal wells and their equipment in this interval filters.

There is a method of completion of well construction (patent RU №2134341, IPC E21B 43/11, publ. 10.08.1999,, bull. No. 22), including a descent into a drilled well casing with the filter fitted plugs in the holes in the filter material destroyed during the chemical exposure, the installation of the production casing in the well with the location of the filter in the productive interval of the formation, plugging of the production string with the filter, the expectation of curing grouting material, the descent into the well of the column tubing, filling the wells with a chemical reagent, patience well at the time of destruction plugs holes of the filter, the injection of gas with a variable pressure to the connection rate of the injected gas with the reservoir fluid and clean the bore from the reaction products according to the invention in the grouting material in the interval filter type material, soluble chemical reagent for the destruction of the plugs holes of the filter before filling the wells with a chemical reagent fill the cavity tubing gas when open ZAT is obnam space at the wellhead and push them downhole fluid to the bottom of the tubing, and after filling the wells with a chemical reagent his push gas into the annulus in the interval of the filter, after which the annulus at the wellhead is closed, and the subsequent injection of the gas is performed by the compressor.

The disadvantages of this method:

first, the low quality of the opening of the reservoir, due to plugging of the filter casing, the filter is formed of a cement stone, worsening the hydrodynamic coupling hole and the reservoir;

- secondly, the low efficiency of development of deposits of heavy oil, due to the fact that when water breakthrough at some interval filter is flooding the entire production;

- thirdly, the imperfection of the opening of the reservoir, due to the fact that the number of holes formed through the body of the filter, which is installed soluble under the action of a chemical reagent plugs, do not take into account reservoir characteristics of separate parts of the reservoir, and this means that in areas with high porosity and permeability characteristics of the reservoir bandwidth of the filter is limited, and in areas with low porosity and permeability characteristics of the reservoir, on the contrary, the capacity of the filter will exceed that of the selection of the high-viscosity oil in this zone.

Also there is a method of completion of well construction (A.S. SU # 1210507, IPC E21B 43/08, publ. 07.12.1987, including the descent into a drilled well casing, equipped with a filter with stubs holes of the filter material destroyed during the chemical exposure, the installation of the production casing in the well with the location of the filter in the productive interval of the formation, plugging of the production string with the filter, the expectation of curing grouting material, run a string of tubing in the hole, filling the hole with a chemical reagent, patience well at the time of destruction plugs holes of the filter, the injection of gas with a variable pressure to the connection rate of the injected gas with the reservoir fluid and clean the bore from the reaction products.

The disadvantages of this method:

- first, when the plugging of the production string with the filter space between the reservoir and the filtration channels in the edges of the filter overlaps backfill material, which reduces the productivity of the well.

- secondly, there is inefficient opening of a productive layer due to the fact that the number of holes formed through the body of the filter, which is installed soluble under the action of a chemical reagent plugs, do not take into account reservoir is harakteristiki individual sections of the reservoir, this means that in areas with high porosity and permeability characteristics of the reservoir bandwidth of the filter is limited, and in areas with low porosity and permeability characteristics of the reservoir, on the contrary, the capacity of the filter to exceed the total selection of high-viscosity oil in this zone.

The closest in technical essence is the method of installation of the downhole filter (patent RU №2378495, IPC E21B 43/08, publ. 10.01.2010,, bull. No. 1), including the descent into the drilled hole, at least one of the downhole filter installed as part of the production string and contains the cut tube through the holes in the filter, each downhole filter before descending into the well set the centralizer, which is fixed at the free filter element pipe downhole filter, above the downhole filter set casing packers, the number of which corresponds to the number of productive strata, after the casing is washed well and turn upwards to activate the packers, closing the Central hole in the seat of the packers fault element, for example a ball, with a subsequent rise in pressure inside the operational the column and pumping cement into the annulus for mounting the casing above the company offers the th layer, after hardening of the cement produced drilling cementing plugs, saddles packers and fault elements, as well as cut off the tube all the filters.

The disadvantages of this method are:

firstly, a complex process associated with alternate landing packers, the number of which corresponds to the number of productive layers, while landing packers carry out, closing the Central hole in the seat of the packers fault element, for example a ball, with a subsequent rise in pressure inside the casing and pumping cement into the annulus above the productive formation, after the hardening of the cement produced drilling cementing plugs, saddles packers and fault elements;

- secondly, the low reliability of the method is related to the fact that landing packers carry out, closing the Central hole in the seat of the packers fault element, for example a ball, and in horizontal wells likely unpressurized landing fault element on the packer saddle;

- thirdly, a long process of destruction of the cutting tubes, because their destruction is produced simultaneously with the drilling cementing plugs, saddles packers and fault elements;

- fourth, ineffective opening of the reservoir, as the number cf the loan tubes, mounted on the body of the filter, does not take into account porosity and permeability characteristics of the reservoir, so the bandwidth of the filter will not match the reservoir characteristics of separate parts of the reservoir, for example, in areas with high permeability bandwidth of the filter will be limited, and in areas with low permeability, on the contrary, the capacity of the filter to exceed the total selection of high-viscosity oil in this zone.

The technical objectives of the proposals are to increase the reliability and efficiency of installation of the downhole filter into steam horizontal well, simplifying the process of implementation of the method, as well as reducing the duration of the destruction of the cutting tubes.

The tasks are solved by the method of installation of the downhole filter into steam horizontal wells, including drilling steam horizontal wells, the descent into a drilled well casing, equipped with a downhole filter with cut plugs in the holes and packers, the fastening of the production string in the well with the location of the filter in the productive interval of the formation, destruction, cutting tubes in the holes in the filter.

What's new is that in the process of drilling horizontal wells ODA is really reservoir characteristics, change within the productive formation trunk horizontal wells, divide the wellbore into zones, which differ in porosity and permeability characteristics of 1.5-1.6 times, and then select the area of the flow areas of the openings of the filter depending on reservoir characteristics and number of holes separately for each zone, carry out the holes in some parts of the filter and install them cut the tube, then at the wellhead filter inside equip shear funnel fixed shear element relative to the filter, and the outside casing swollen packers, down in the drilled horizontal well production casing with filter and set the filter well so similar to swollen packers were on the borders of zones of the reservoir with different reservoir characteristics, generate fastening of the production string, then at the wellhead gather the layout from the bottom up: magnetic safety device, pusher, rigid centralizer with peritonei channels on the periphery, the lower the Assembly to the column pipe in the hole to lock the pusher in shear funnel, unload a string of pipe 5 kN and destroy shear element, move the shear funnel through the plunger until it stops in the first row of cutting tubes, panostusrajat column pipes on shear funnel and destroy the first row of cutting tubes, which after the destruction of the fixed magnetic device, then move the string of pipe from the mouth to the bottom and destroy the following number of cutting tubes with fixing them on magnetic safety device, the weight of the tubing or injection of fluids from the mouth followed by rinsing well, then again completely unload the string of pipe on shear funnel and destroy the remaining rows of cutting tubes across the cross section of the filter, remove the string of pipe layout, then in the hole to bottom down a column of flexible pipes, make it move from the bottom to the mouth throughout the filter and at the same time the column flexible pipes produce injection grouting composition, which isolate the holes drilled in the bottom perimeter of the filter.

In figure 1, 2, 3, 4 schematically illustrates the method of installing the downhole filter into steam horizontal well.

The proposed method is as follows.

In the process of drilling a horizontal shaft steam wells to determine reservoir characteristics and their variation within the productive formation 1 (1) trunk horizontal wells 2. Divide the horizontal well bore 2 into zones, which differ in porosity and permeability characteristics of 1.5-1.6 times.

For example, the length L STV is La steam horizontal wells 2 in the reservoir 1 is equal to 190 m, identified reservoir characteristics and their change on the trunk of a horizontal well 2 as follows:

zone 3' - permeability of 0.85 D, length L1=90 m;

zone 3 is the permeability of 1.3 D, length L2=60 m (1.53 times relative to zone 3');

zone 3"' - permeability of 2.0 D, length L3=40 m (1.54 times relative to the zone 3").

Border zones 3', 3", 3"' are the boundaries of length L1, L2, L3in which filtration-capacitive properties differ 1.5-1.6 times.

Then select the area of the passage sections (bandwidth filter) holes 4, 4', 4"...4n(figure 1 shows the relative) filter 5 (depending on reservoir characteristics).

The filter 5 is made of casing pipes with an outer diameter of 168 mm and an inner diameter of 140,3 mm

The cross-sectional area of the filter 5 - 154,5 cm2.

Selection of area of flow sections of holes 4, 4', 4"...4'nfilter 5 for each zone, 3', 3", 3"' carried out by any known method, for example as described in patent RU No. 2134341, IPC E21B 43/11, publ. in bull. No. 22 of 10.08.1999,

Next, determine the number of holes 4, 4', 4"...4", performed in the filter 5 in each zone, calculated by the formula:

NZi=(K1/Ki)·(4·Fk/π·do2)·Li/k,

where K1- minimum permeable shall be rocks in the zone of the productive part, exposed horizontal wells, D.;

Ki- the permeability of rocks in the zone of the productive part of the exposed horizontal wells, D.;

Fk - sectional area of the filter, cm2;

π=3,14;

do - diameter plugs 6, 6', 6"...6n(figure 2 shows conventionally inserted into the holes 4, 4', 4"...4n(1) filter 5, cm, do=1.2 cm;

Li- the length of the productive zone of the horizontal wells;

k - factor duty cycle, taking into account that the development of high-viscosity oil pools is conducted through the upper perimeter of the filter 2, take k=5.

Thus, substituting the values into the formula, we get the number of holes that are performed in the filter 5 in each individual area:

NZ1=(0,85/0,85)·(4·154,5/3,14·1,22)90/5=2460 pieces

NZ2=(0,85/1,3)·(4·154,5/3,14·1,22)60/5=1072 pieces

NZ3=(0,85/2,0)·(4·154,5/3,14·1,22)40/5=465 PCs

For example, for a zone of length L2with the number of holes 1072 perform pieces: 8 holes with a diameter of 25 mm around the perimeter of the filter 5, the distance between rows of radial holes of 0.45 m, ie 60 m/(1072 m/8)=0,45 m Similarly carry out the holes in the filter 5 in the remaining zones with lengths L1, L3.

All holes 4, 4', 4"...4nset the cut off tube 6, 6', 6"...6n(figure 3), for example, pressed cut off tube 6, 6', 6"...6nthe bottoms 7, 7', 7'��...7 ninside holes 4, 4', 4"...4nfilter 5.

At the wellhead inside the filter 5 (Fig 1) establish shear funnel 8 and fixed relative to the filter 5 shear element 9 relative to the filter 5, and the outside casing swollen packers 10', 10". Down in the drilled horizontal well 2 production casing 11 with the filter 5 and set the filter 5 in the hole 2 so that similar to swollen packers 10', 10" has been at the boundaries of the zones of the reservoir 1 with different reservoir characteristics.

As a porous absorbing swelling packers 10', 10" use packers brand FREECAP firm THERE. These packers expand (swell)by separation of the layers after exposure to water on their sleeve, while the volumetric expansion of the packer reaches 200%.

The use of a porous absorbing swelling packers excludes alternate landing packers by dropping from the mouth into the hole of the locking elements, as well as drilling and cementing plugs, saddles packers and fault elements, which allows to simplify, speed up and reduce the cost of implementation of the method.

Landing casing swollen packers occurs due to contact with water injection in horizontal wells, which eliminates the use of fault elements for planting packers and verojatno the ü their unpressurized landing on the saddle packers, and it improves the reliability of the method.

Make the mount casing 11 (Fig 1) in a horizontal borehole 2 by plugging 11' and 11", before the filter 5 and to the bottom 12, respectively. Leave horizontal well 2 on the waiting time of hardening of the grouting material, for example cement, within 48 hours

The exception cementing filter 5 and the calculation of the selection area of flow sections of holes 4 filter 5 for each zone, 3', 3", 3"' of the productive formation, depending on the permeability increases as the drilling-1 and optimizes the injection of steam into the heavy oil reservoir.

Then at the mouth of horizontal wells 2 gather the layout from the bottom up: magnetic safety device 13, the plunger 14, the rigid centralizer 15 peritonei channels 16 on the periphery. For example, rigid centralizer 15 is provided with four longitudinal ribs (1, 2, 3, 4 not shown) and respectively four peritonei channels 16 formed between the longitudinal ribs. Peritonei channels 16 to allow bypass of fluid through the rigid centralizer 15 in the process of implementation of the method.

As the magnetic safety device applied magnetic inkjet Meterological (MSM), manufactured by Neftekamsk plant of oil equipment (Russia, Republic of Bashkortostan, Neftekamsk) MSM is designed to extract from downhole oil and gas wells small metal objects. In MSM apply high-energy magnets, the coercive force of which is almost 10 times higher than the force previously used magnets.

In steam horizontal well 2 put the layout on the string of pipe 17 to the stop of the plunger 14 in the end face 18 (Fig 1) shear funnel 8.

Unload a string of pipe 17 to 5 kN and destroy shear element 9, the locking shear funnel 8 relative to the casing 11. Under the weight of the pipe string 17 is moved shear funnel 8 (figure 2) by means of the pusher 14 to the stop in the first row of cutting tubes 6.

Then the string of pipe 17 entirely (own weight) unload on shear funnel 8 and destroy the first row of cutting tubes 6.

After the destruction of a number of cutting tubes 6 and they are fixed on the surface of the magnetic safety lock 13 due to the attracting force of the magnet.

Further, under its own weight and moves the string of pipe 17 from the mouth to the bottom 12 and destroy the following number of cutting tubes 6' with their fixation on magnetic safety device 13.

If in the process of destruction of a number of cutting tubes 6, 6' own weight of the pipe string 17 is not enough (i.e. at full discharge column pipe 17 is not moved into the well to fracture shear funnel 8 number of cutting tubes 6', with the mouth of the steam horizontal wells 2 in the column t the UB 17 serves the process liquid, for example, fresh water density of 1000 kg/m3and produce wash horizontal wells 2, for example, to twice the amount of wells equal to 10 m3.

During the cleaning process liquid rises to the wellhead 2 through the annular space 19, flowing at the periphery of the rigid centralizer 15 through his peritonei channels 16.

Well wash process fluid allows you to clean the hole from dirt, mud, destroyed a number of cutting tubes 6', which prevents destruction of a number of cutting tubes 6" under the weight of the pipe string 17.

In addition, flushing allows you to collect on the outer surface of the magnetic device 13 destroyed cut off tube 6'.

After washing the column pipe 17 again is completely unloaded by the pusher 14 to shear funnel 8 and destroy the remaining cutting tube 6 over the whole cross section throughout the filter 5. The string of pipe 17 with the layout of the extract on the surface.

In steam horizontal well 2 to the bottom 12 of the lower pillar pipe bending (figure 1, 2, 3, 4 not shown), for example, a diameter of 38.1 mm, Then a column of flexible pipes move from the bottom 12 (figure 2) to the mouth throughout the filter 5, while at the same time flexible tube pump cement composition such as cement mortar 20 (figure 4), which isolate the 4 holes on the bottom PE is imetro filter 21.

Thus, in the horizontal well 2 (figure 2 and 4) cement mortar 20 flood the lower perimeter 21 filter 5 over its entire length (L=190 m). At the end of the waiting time of hardening of the cement, for example 24 hours, the filter 5 (figure 4) has opened holes 4 only along the upper perimeter 22 filter 5 over its entire length (L=190 m).

The proposed method of installation of the downhole filter in horizontal well steam allows you to:

- to improve the quality of drilling horizontal wells in high-viscosity oil pools;

- to increase the effectiveness of working agent to Deposit high-viscosity oil, regardless of its permeability rocks;

- reduce the duration of the destruction of cut tubes.

The method of installation of the downhole filter into steam horizontal wells, including drilling steam horizontal wells, the descent into a drilled well casing, equipped with a downhole filter with cut plugs in the holes and packers, the fastening of the production string in the well with the location of the filter in the productive interval of the formation, destruction, cutting tubes in the holes in the filter, characterized in that in the process of drilling horizontal wells to determine reservoir characteristics the Tiki, change within the productive formation trunk horizontal wells, divide the wellbore into zones, which differ in porosity and permeability characteristics of 1.5-1.6 times, and then select the area of the flow areas of the openings of the filter depending on reservoir characteristics and number of holes separately for each zone, carry out the holes in some parts of the filter and install them cut the tube, then at the wellhead filter inside equip shear funnel fixed shear element relative to the filter, and the outside casing swollen packers, down in the drilled horizontal well production casing with filter and set the filter well so similar to swollen packers were on the borders of zones of the reservoir with different reservoir characteristics, generate fastening of the production string, then at the wellhead gather the layout from the bottom up: magnetic safety device, pusher, rigid centralizer with peritonei channels on the periphery, the lower the Assembly to the column pipe in the hole to lock the pusher in shear funnel, unload a string of pipe 5 kN and destroy shear element, move the shear funnel through the plunger until it stops in the first row of cutting tubes, panostusrajat column pipes on shear funnel and destroy the first row of cutting tubes, after the destruction recorded on magnetic safety device, then move the string of pipe from the mouth to the bottom and destroy the following number of cutting tubes with fixing them on magnetic safety device, the weight of the tubing or injection of fluids from the mouth followed by rinsing well, then again completely unload the string of pipe on shear funnel and destroy the remaining rows of cutting tubes across the cross section of the filter, remove the string of pipe layout, then in the hole to bottom down a column of flexible pipes, make it move from the bottom to the mouth throughout the filter and at the same time the column flexible pipes produce injection grouting composition, which isolate the holes drilled in the bottom perimeter of the filter.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of a well shaft in a productive formation and a sump at its bottom; reaming of the shaft at the productive formation interval without well flushing with removal of drilled rock slurry to the sump; partial filling of the shaft with filtering mass after it is reamed; lowering to the well of the tubing string of the liner with slot perforation channels; performance of hydraulic fracturing of the productive formation and stimulation of the formation fluid flow to the well. According to the invention, well shaft and sump drilling is performed from under the shoe of the casing string. Prior to lowering to the well, a mechanical anchor and a plug are connected to the lower end of the liner, and an elastic self-sealing cuff with a removable casing arranged on its outer side is connected to the upper end. Lower part of the tubing string is equipped with a packer and a delivery branch pipe, the lower end of which is plugged. The delivery branch pipe is connected to the removable casing. Before hydraulic fracturing of the productive formation is performed, the mechanical anchor is fixed in the sump, and the packer is installed in the casing string. Partial filling of the shaft with filtering mass is performed when fracturing fluid with proppant material is being pumped to the productive formation. After the pumping process is finished, there subsequently performed is breakdown of the packer in the casing string, axial movement of the tubing string in the upward direction to release the elastic self-sealing cuff from the removable casing and further removal to surface.

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2 dwg

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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EFFECT: improving operating reliability of the device.

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FIELD: oil and gas industry.

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EFFECT: increasing efficiency of gravel packing and extraction of product.

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FIELD: construction.

SUBSTANCE: device comprises a body, connected actuating mechanisms and a nozzle, with which a body of throttling stop valve is connected. In the valve body there are radial holes closed in the initial position, which may in the working position hydraulically connected the nozzle cavity with the units of the actuating mechanisms drive, for this purpose in the nozzle there is a longitudinal slot, along which a guide screw fixed in the valve body may move. At the same time the valve body is connected with the nozzle by means of a shear screw.

EFFECT: higher reliability of device operation in case of unauthorised pressure increases.

2 cl, 2 dwg

Well screen // 2514057

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device comprises metal pipe with holes stopped by plug from below and by coupling from above and cylindrical filter element arranged there inside and aligned therewith. Pipe top section with holes is composed by a separate section with no inside filter element coated with screen on the outside. Said section houses rubber diaphragm composed by the sleeve. Diaphragm thickness decreases in vertical line parallel with metal pipe axis and aligned with elongated hole major axis. Proposed filter is composed of sections connected by couplings. Pipe top section with holes is connected with pump on one side or with shank by coupling and with downstream filter section on opposite side.

EFFECT: higher reliability, simplified design, increased MTBR.

3 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: in drilling, seepage-volume characteristics of the bed and their alteration over borehole are defined, borehole is divided into zones that differ in said characteristics by 1.5-1.6 times to select filter performance separately for each zone and quantity of holes. Screen filter elements are fitted in filter holes under plugs. Flow string with filter equipped with water- or oil-swelling packers is lowered into well, said packers being set at boundaries of zones with different characteristics and string being fixed. Assembly is assembled at mouth and composed of the following elements arranged from bottom to top, i.e. cutter, locating bearing, screw downhole motor and stiff locator to be lowered against the stop to plugs. At cutting sheared plugs, flow string is displaced downward to remove sheared plugs and to withdraw the flow string. Flexible pipe sting is lowered to work face and displaced therefrom to mouth along with injection of plugging material to isolate holes made at filter bottom perimeter.

EFFECT: higher efficiency of extraction or injection, simplified mounting.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: device consists of a support tube with a number of longitudinal cuts, draining and filtering metal meshes. The meshes are corrugated longitudinally and placed with a gap in-between which is filled with granular filling. Perimeter of the filtering mesh in cross section is equal to perimeter of the well borehole.

EFFECT: improving reliability, fineness of filtering and service life of the screen.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and is intended for well strainers in producing and injection horizontal wells. The device contains a hollow case inserted into a well strainer component and an end plate made of magnesium and connected to the case in an annular groove inside the case. The groove is made in the upper part of the case; it has an inner cavity with a snap ring installed in it; the latter fixes the end plate inside the case rigidly. At the opposite side of the case there is an inner cylindrical cavity with mesh filter element with cells installed in it and fixed rigidly by a hollow sleeve. In the basic element an opening is made with the inner thrust, thread is cut inside the opening, the case blank is prepared, its length is measured and cut off, external screw thread is made and the annular groove and the inner cylindrical cavity are made inside the case; then the inner cavity is made inside the annular groove, the end plate is installed and fixed. The hollow case is overturned and the mesh filtering element is inserted into the inner cylindrical cavity, fixed by the hollow sleeve; then the hollow case is crewed into an opening at the basic element with end plate to outside until tight.

EFFECT: improving operational efficiency and service life of the strainer, simplifying its assembly.

2 cl, 2 dwg

Well filter // 2509206

FIELD: mining.

SUBSTANCE: device comprises a hollow body with radial holes closed with a tight fit by hollow cut pins, a filtering unit placed outside the body and forming a circular cavity with the latter, which is hydraulically communicated with the body cavity via hollow cut pins in the working position of the device. Each of the hollow pins is made in the form of a sleeve with a bottom placed in the cavity of the body, and the side surface having the external ledge, which fixes the sleeve at the outer side of the body, and an outer transverse corrugation that fixes the sleeve at the opposite - internal side of the body.

EFFECT: higher reliability of operation.

3 cl, 2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: aperture filter comprises perforated load-bearing pipe and slot filtration element made up of wire wound on lengthwise elements in helical line. Wire cross-section feature pentahedral shape. One of wire faces is parallel with filter lengthwise axis to make its outer surface. Every cheek has two faces. Top faces make filtration gap while bottom faces converged to form acute angle. Top faces are perpendicular to filter lengthwise axis and parallel with top faces of adjacent turns. Angle of inclination of top faces from crosswise axis is larger than that of bottom faces. Angle of bottom faces connection is rounded.

EFFECT: higher reliability, efficiency and wear resistance.

11 cl, 11 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device tail pipe fitted at pump inlet to extend through packer, mid pipe plugged from above to make with tail pipe a concentric chamber plugged from below, accumulating pipe of solid particles, cylindrical filtration element arranged between tail pipe and accumulating pipe. Concentric chamber has radial channels arranged directly above and below the packer. Horizontal perforated girths are arranged between radial channels in mid pipe, mid pipe being furnished with through holes. Spring loaded top and bottom valves rigidly connected by rod are arranged on both sides of said horizontal girths. Leaky piston is arranged above top valve spring, piston diameter being equal to top valve diameter. Elasticity of top spring exceeds that of bottom spring.

EFFECT: expanded performances.

7 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed filter comprises bearing carcass, filtration round brushes made up of cylindrical case with radially directed bundles of frieze, bundles diameter exceeding ID of operating tubing. Bearing carcass is composed of a perforated tube. Holes are made in said cylindrical case between frieze bundles. Tube space between bearing carcass and operating tubing is covered by splitter arranged above the filter.

EFFECT: higher quality of filtration.

1 dwg

Well strainer // 2499130

FIELD: oil-and-gas industry.

SUBSTANCE: device comprises filtration sections, each comprising filtration jacket provided with lengthwise rods with end rings rigidly secured at base element composed of perforated tube. Filtration jacket is composed of lengthwise round rods and ring-like stiffness ribs. Said lengthwise rods are rigidly and coaxially secured at edges of stiffness ribs and end rings. Stiffness ribs are arranged between end rings with allowance for filtration section length. Note here every filtration section is mounted at separate base element. Metal gauzes are rigidly fitted in tube every hole with mesh size increasing from tube outside to its inside. Minimum mesh size is larger than clearance between lengthwise rods.

EFFECT: simplified assembly, higher reliability.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes the main pipe designed with inlet, filtering pipe arranged on the main pipe, layer of flow direction formed between the main pipe and filtering pipe, and flow control device designed with inlet, channel and outlet. Inlet of flow control device is connected to the layer of flow direction. Outlet of flow control device is connected to inlet of the main pipe. At least one fixed support protruding inside is arranged on inner surface of filtering pipe wall.

EFFECT: simplifying manufacturing technology, improving production efficiency.

11 cl, 3 dwg

Well filter // 2244103

FIELD: oil extractive industry.

SUBSTANCE: device has perforated body, multi-layer filtering element and is additionally provided with torsion spring, concentrically placed between body and filtering element, while filtering element is made with possible increase or decrease of dimensions in radial direction during coiling or uncoiling of spring.

EFFECT: higher efficiency.

2 dwg

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