Filtering module

FIELD: oil-and-gas industry.

SUBSTANCE: device contains a bearing housing designed as a pipe, a shaft, a filtering element consisting of, at least, one unit of independent replaceable ring filtering bushings, installed coaxially with the housing. The module is fitted with, at least, one gripping bushing which is coaxially installed on the housing surface, with, at least, one additional spacer ring on the joint of adjacent of replaceable bushing units, installed on the external surface of the housing and fitted with a radial hole. The centralizer designed as a thin-walled ring frame which has a cross-section with adjacent ledges and hollows in the radial direction, is installed with possibility of adjunction of ledges to the internal surface of the filtering element and hollows to the external surface of the housing. The internal surface of each gripping bushing is fitted with evenly distributed on it radial depressions designed open from the bearing housing and through along a longitudinal axis of the gripping bushing. The external surface of each gripping bushing and the top flange of the module are fitted with ledges. The module case in the zone of location of each sliding bearing is fitted with, at least, one radial channel and a radial hole.

EFFECT: reliability improvement and service life increase, service facilitating, productivity increase.

13 cl, 7 dwg

 

The invention relates to the production of liquid and gaseous fluids from boreholes, in particular to underground filtration, namely to designs of oil filters, and may find application in the operation of oil and gas wells.

Known filter module comprising a bearing housing made in the form of a perforated cylindrical pipe with radial holes, a shaft disposed in the cavity of the housing and the filter element, overlying the radial holes, mounted coaxially with the outside of his body to form between them a radial gap, wherein the housing is rigidly connected by their ends with upper and lower flanges, respectively, and upper and lower ends of the shaft connected to the pump and submersible motor, respectively, wherein the filter module is additionally provided with at least one Central and two peripheral bearings, fixed mounted in the axial direction between the shaft and inner surface of the housing rotatably them in the shaft, is provided with a centralizer and device for optimal compression of the filter element in the axial direction, is made in the form of a threaded connection with an adjusting washers and provided with spacer rings located at the junction of the filtering elements�and with upper and lower flanges for adjusting the overall axial length of the filter element by the interaction of each threaded connection with a corresponding securing ring, moreover, the centralizer is made of a cylindrical lattice "squirrel cage" and contains two sleeves rigidly interconnected longitudinal discretely mounted rods, and disposed coaxially between the housing and filter element with the abutment bushing to the cylindrical surfaces of the housing and the filter element, respectively, in both end zones, and the gap between the housing and filter element is formed in the spaces between the rods, the filter element comprises at least one Autonomous unit replaceable annular filter bushing is provided with annular end caps rigidly connected with them, is flush with the filter surface and successively installed along the body with a dense adjunction to each other circumferential ends of the lugs, made with mutually mating profile, and as a filtering material drawn wire of non-woven material, or "metallorubber", or pressed metal thread waste, permeable or porous material, and the average pore size of preferably a multiple of 10 microns and selected from a number in the range of 50-600 μm, the porosity of the filtering material is made, preferably, equal to 70-95%, and the total area of the radial holes in the casing, preferably 0.5-5%. Radial hole�Stia in the housing of the filter module may be formed with a cylindrical form or in the form of longitudinal grooves or with a variable in the axial direction of diameter. The diameter of the radial holes in the housing of the filter module can be made constant, preferably equal to 8-30 mm in diameter equal to 50-150 mm or variable in the axial direction of the housing. The filter module can be fitted with a bypass valve.

Tips of the filtering sleeves can be made of metal such as stainless steel, or polymer, or CFRP. The porous structure of the filter elements may be formed with a hydrophobic coating.

Mutually conjugate profile of the annular end faces of the ferrules in the zone of junction of each adjacent pair of the annular filter bushing can be made flat and perpendicular to the axis of the filter element.

Mutually conjugate profile of the annular end faces of the ferrules in the zone of junction of each adjacent pair of the annular filter sleeves can be made in the form of a polyline.

As the material of the filter element can be taken and corrosion-resistant materials, for example stainless steel and/or polymers of a number of the Polyphenylene sulfide, and/or polyetheretherketone, and/or polyimides, and/or carbon-graphite. / RF patent for useful model №120999 "Filter module", EV 43/08, publ.2012/.

In the process known aggressive filtering unit, the working medium is pumped by submersible pump, constantly washed by the bearing�and slip in which a shaft is mounted, exposing them to increased wear. In addition to the toga itself is perforated housing of the filtering modules, especially large, due to the weakening perforations becomes fragile and is exposed to possible bending. Due to the contiguity of the two annular filter of cylindrical bushings grid "squirrel cage" to a cylindrical surface of a bearing housing and a filter element in both end zones of the lattice is disturbed the passage of working medium filtered through such a design of the centralizer. The working medium passes through discretely installed rods "squirrel cage", but then has no possibility of a quick exit from a "squirrel cage" due to the complete overlap of the two bushings radial clearance of the annular cavity between the inner cylindrical surface of the filter element and the outer cylindrical surface of the tool body, wherein the radial clearance between the housing and filter element is formed only in the intervals between the rods. The filtered flow of the working environment, limited by the two bushings of the lattice, can only with very low speed to penetrate through the holes of the perforated lifting body in the area of "squirrel cage".

The objective of the proposed invention consists in increasing the reliability and durability of operation�orientation of the filter module by hardening of the tool body, made with a limited number of radial channels in the zone of the slide bearings and radial holes in the area of each gripping sleeve, protect these bearings from the destruction of aggressive working environment, and effective fixation of the filter element by a strong centralizer, and also to facilitate maintenance of the module through the use of the grasp of the sleeves and the improved performance of the module by speeding up the filtration process.

To solve the problem with the achievement of the claimed technical result of the known filter module comprising a bearing shell in the form of a cylindrical tube, a shaft disposed in the cavity of the housing, and a filter element, comprising at least one Autonomous unit replaceable annular filter bushings and mounted coaxially with the housing, outside of it to form between them a radial gap, slide bearings, fixed mounted in the axial direction between the shaft and the inner cylindrical surface of the tool body rotatable shaft in them, at least one centralizer, located coaxially between a bearing housing and a filter element adjacent to the cylindrical surfaces of the tool body and the filter elem�NTA, and device for optimal compression of the filter element in the axial direction, is provided with at least one spacer ring disposed at the junction of the filter element with upper and lower flanges of the module, wherein the supporting body is rigidly connected by their ends with upper and lower flanges from the side of the submersible pump Assembly and tighten hydronamic submersible motor, respectively, an annular sleeve of filter elements mounted in series along a lifting body with a dense adjunction to each other annular end faces, and the filter

material has been drawn wire of non-woven material, or "metallorubber", or pressed metal thread waste, permeable or porous material, according to the present invention, the filter module is additionally provided with at least one gripping sleeve with a locking mechanism, coaxially mounted on the outer surface of the tool body, at least one additional spacer ring disposed at the junction of adjacent blocks of the Autonomous replaceable annular filter bushing mounted on the outer surface of the tool body and provided with at least one radial groove, the open side of the tool body, provided with a coaxial shaft with spacer devices, made in the cavity between�the shaft and the inner surface of the tool body, for example, in the form of individual pipe segments placed along the filter module between the bearings and the upper flange of the module in the connection zone with submersible pump provided with a cylindrical cavity communicated with the inlet of the submersible pump cavity, and the longitudinal channels made with the possibility of messages of this cylindrical cavity with an annular cavity between the bearing housing and the filter element, wherein each clamp is made in the form of an annular frame, preferably thin-walled, having a cross-section with adjacent projections and depressions in the radial direction, and installed with the possibility of adjunction of protrusions to the inner surface of the filter element and valleys to the outer surface of the tool body along the entire axial length of the centralizer, the inner cylindrical surface of each gripping sleeve is provided with at least one radial groove, the open side of the tool body and is made with the possibility of formation of at least one of a through longitudinal channel of the gripping sleeve, the bearing housing of the filter module in the area of each bearing is provided with at least one radial channel, and in the area of each gripping sleeve bearing housing is provided with a radial hole, posted with the capability�Yu education single part of each gripping sleeve and a bearing housing of the filter module through the corresponding locking mechanism, set one portion in the radial hole of the tool body and the other part is in the open recess of the inner cylindrical surface of a through longitudinal channel of the gripping sleeve and the outer sleeve bearings with an annular groove and a seal positioned in adjacency to the inner cylindrical surface of the tool body, and the segments of the spacer tubes in the radial channels of the tool body is provided with overflow holes.

The inner cylindrical surface of each gripping sleeve may be provided with evenly it distributed radial recesses are open from the side of the tool body, through the entire length of the gripping sleeve and are arranged parallel to its longitudinal axis with the possibility of discrete abutting sections between adjacent radial grooves to the outer cylindrical surface of the tool body of the filter module.

The outer cylindrical surface of each gripping sleeve may be provided with projections associated with each of them and are made with an outside diameter preferably greater than the outer diameter of the filter element.

The locking mechanism of each gripping sleeve may preferably be T-shaped.

Outer�Ernest the upper flange of the module may be provided with projections, paired with him and formed with an outer diameter preferably greater than the outer diameter of the filter element. Annular frame of the centralizer with adjacent projections and depressions in the cross section can be made in the form of non-closed elastic metal strip.

Annular frame of the centralizer with adjacent projections and depressions in the cross section may be formed as a closed elastic metal strip.

Annular frame of the centralizer with adjacent projections and depressions, in cross section may be formed as a metal mesh.

The centers of the circumferences of the surfaces of the radial recesses of the gripping sleeve, the open side of the tool body, can be located in the area of the outer cylindrical surface of the tool body.

Adjacent the projections on the outer cylindrical surface of each gripping sleeve and adjacent the projections on the outer surface of the upper flange of the module can be formed at an angle, preferably equal to 60-90 degrees.

The radial recess in additional o-ring, located at the junction of adjacent blocks adjacent Autonomous annular filter sleeves can be made through the entire length of the spacer rings.

Seal bearings that are located in grooves of the outer bushing with primycin�eat to the inner surface of the tool body, can be made of swelling in a production environment elastomeric composition, for example, rubber-based EPM-T.

The spacer device made in the form of tubes disposed in the cavity between the shaft and the inner surface of the tool body between the slide bearings can be equipped with by-pass channels.

In the process of searching by the patent and scientific literature revealed no known proposed combination of essential features.

The essence of the proposed technical solution is illustrated graphically.

Fig. 1 shows a diagram of the downhole installation containing the filter module.

Fig. 2 shows a cross section along a-A of the filter module through the centralizer in the form of an annular frame in the form of open-loop tape.

Fig. 3 shows a cross section along b-B of the filter module through the gripping sleeve.

Fig. 4 shows a cross section along b-In filter module via an additional spacer ring.

Fig. 5 shows a cross section along g-G of the filter module in the area of the longitudinal channel in the upper flange of the module.

Fig. 6 shows a longitudinal section of the proposed filter module with an annular frame of a bow made in the form of open-loop tape.

Fig. 7 shows a flow chart working with�food offered through the filter module. Shown in Fig.1 diagram of the downhole installation includes placed inside the well with the fluid filter module 1 mounted between the base 2 and head 3. From the upper flange 4 of the filter module 1 is fastened to the submersible pump 5 is communicated with a pump and compression pipe 6. To the lower flange 7 of the module is attached to the node 8 hydronamic associated with submersible electric motor 9.

Fig. 2-6 presents the proposed filter module comprising a bearing housing 10, is formed as a cylindrical pipe, the shaft 11 with the longitudinal axis 12, the filter element 13, placed coaxially inside the annular cavity 14 of the housing 10, and the bearings 15 slides, fixed mounted in the axial direction between the shaft 11 and the inner cylindrical surface 16 of the tool body 10 to rotate shaft 11 in them. In the annular cavity 14 between the bearing housing 10 and filter element 13 adjacent to the outer cylindrical surface 17 of the tool body 10 and the inner cylindrical surface 18 of the filter element 13 is located coaxially centralizer 19.

The ring clamp 19 is formed as an annular frame, preferably,thin-walled, with adjacent projections 20 and depressions 21 in the radial direction and is mounted abutting ledges in 20 to�morning surface 18 of the filter element, and depressions 21 to the outer surface 17 of the tool body 10 throughout the axial length of the centralizer 19.

In addition, the module comprises a device 22 for optimal compression in the axial direction of the filter element 13, is provided with, for example, a securing ring 23 disposed at the junction of the filter element 13, for example, with the lower flange 7 of the module to control the overall axial length of the filter element 13.

In this case the filter element 13 is, for example, several Autonomous units adjacent annular filter bushing 24 and is mounted coaxially with the bearing housing 10, outside it, with the formation between them (the supporting body 10 and the filter sleeves 24) radial clearance. An annular filter sleeve 24 of the filter elements 13 are arranged in series is flush with the filter surface, with a dense adjunction to each other annular end faces.

As the filter material has been drawn wire of non-woven material, or metallorubber, or pressed metal thread waste, permeable or porous material.

In addition, the filter module further comprises, for example, one gripping the sleeve 25, (perhaps a few gripping sleeves 25 which are scattered along the length of the filter module 1) and additional o-ring 26 located at the junction of adjacent blocks to be less�'s adjacent annular filter sleeves 24 and mounted on the outer cylindrical surface 17 of the tool body 10 with a seal to it. Additional o-ring 26 is provided with at least one radial recess 27. Also, the filter module 1 further comprises a locking mechanism 28, such as T-shaped.

The inner cylindrical surface 29 of a gripping sleeve 25 is provided with, for example, ten evenly distributed thereon radial grooves 30, the open side of the tool body 10 and performed in gripping the sleeve 25 of the housing 10 with the possibility of education through longitudinal channels 31 along the entire length of the gripping sleeve 25 to 32 axes of these channels parallel to the longitudinal axis of the tool body 10 and with the possibility of discrete abutting sections between adjacent radial grooves 30 to the outer surface 17 of the tool body 10 of the filter module 1.

Radial recesses 30 of a gripping sleeve 25 may be made of, for example, with a cylindrical generatrix 33, oriented parallel to the longitudinal axis of the tool body 10. In addition, the radial recesses 30 may be formed with a conical taper.

The outer cylindrical surface 34 of the gripping sleeve 25 is provided with projections 35, smoothly with it (the outer cylindrical surface of each gripping sleeve) paired and having an outer diameter exceeding the outer diameter of the filter element 13.

The outer cylindrical surface 34 d�Noah sleeve 25 may be made flush with the diameter preferably greater than the outer diameter of the filter element 13.

The outer surface 36 of the upper flange 4 of the module can also be provided with projections 37, associated and formed with an outer diameter exceeding the outer diameter of the filter element 13.

The radial angle between adjacent protrusions 35 on the outer cylindrical surface 34 of each gripping sleeve 25 and the radial angle between adjacent

the protrusions 37 on the outer surface 36 of the upper flange 4 of the module is preferably made equal to 60-90 degrees.

Bearing housing 10 of the filter module provided with a radially directed hole 38 in the area of the gripping sleeve 25 and each gripping sleeve 25 is connected with the bearing housing 10 of the filter module 1 with the formation of a single part, through the corresponding locking mechanism 28, for example T-shaped, set one portion in the radial bore 38 of the tool body 10 and the other part - in the end face 39 of the radial recesses 30 on the inner cylindrical surface 29 of a gripping sleeve 25, the open side of the tool body 10.

The upper flange 4 of the module 1 in the connection zone with submersible pump 5 is provided with a cylindrical cavity 40, communicated with the inlet cavity 41 of the submersible pump 5, and the longitudinal channels 42 (for example, six longitudinal channels), made with an option of message this cylindrical cavity 40 with an annular cavity 16 between the outer cylindrical surface of a bearing housing 10 and filter element 13. The longitudinal channels 42 may be made inclined.

In the cavity 43 between the shaft 11 and the inner surface 16 of the tool body 10 with the joining of the latter an annular coaxial with the shaft 11 of the spacer device 44, in the form of individual pipe segments placed along the filter module between the bearings 15 slides.

The outer sleeve 45 of the bearings slide 15 is provided with annular grooves 46 and hosted in seals 47, made of swelling in a production environment elastomeric composition, for example, rubber-based EPM-T, and positioned by abutting to the inner surface 15 of the tool body 10.

Bearing housing 10 of the filter module 1 in the area of each bearing slide 15 is provided with at least one radial channel 48 which communicates with an annular cavity 14 between the bearing housing 10 and filter element 13, which enters the working environment. The spacer device 44, made in the form of tubes disposed in the cavity between the shaft 11 and the inner surface 16 of the tool body 10 between the bearings 15 slides ,can be equipped with by-pass channels. The segments of the spacer tubes in the area of radial channels 48 of the tool body 10 and in the area of the T-shaped retainer 28 is provided with a bypass channels 49 and 50, respectively.

�altewai frame clamp 19 in cross section may be formed as a non-closed elastic metal strip.

Annular frame of the centralizer 19 in cross section may be formed as a closed polyhedral elastic metal strip.

Annular frame of the centralizer 19 in cross section may be formed as a metal mesh.

The centers of the cylindrical surfaces of all of the radial grooves 30 of the gripping sleeve 25 forming a through longitudinal channels 31 which can be located in the area of the outer cylindrical surface 17 of the tool body 10.

The proposed filter module is carried out by discharge of the working medium through the filter element 13 inside the annular cavity 14 between the cylindrical surfaces of the tool body 10 and the filter element 13. The bearings 15 and the shaft 11 will remain closed from flood aggressive working environment, as it is placed inside the cavity 43 of the tool body 10.

The design of the centralizer 19 in the form of an annular frame, preferably thin-walled, surrounding their projections 20 to the inner cylindrical surface 18 of the filter element 13 and the depressions 21 to the outer surface 17 of the tool body 10, can firmly and securely fix the filtering surface of the filter elements 13 relative to the tool body 10 with

a limited number of radial channels in the bearing zone with�of Oltenia and radial holes in the area of each gripping sleeve and therefore more durable.

At least one gripping sleeve 25 and additional o-ring 26 mounted on the outer cylindrical surface 17 of the tool body 10, to facilitate the maintenance of the filter module 1, without damaging the filter elements 13, as well as help to strengthen the filtering surface of the module relative to the tool body 10, and thus improve the durability of the filtering module. In addition, each protective sleeve 25 and an additional spacer ring 26 is provided with a through longitudinal channels 31, which allow the smooth flowing stream of working medium filtered through the filter module 1.

For the exception of "dry" friction in the bearings 15 slides in the zone of placement of the last bearing body 10 is provided with at least one radial channel 48, through which may be received a limited quantity of working fluid to the bearing slide 15.

The proposed filter module was successfully tested and prepared for production.

The use of the proposed device will significantly improve the reliability and durability of operation of the filter module of any axial dimensions by hardening of a bearing housing with a limited number of radial channels in the zone of the slide bearings and radial�tion holes in the area of each gripping sleeve and effective fixation of the filter element by means of reliable, preferably thin-walled centralizer, by protecting bearings from the destruction of aggressive working environment, and will facilitate maintenance of the module through the use of gripping sleeves and improve the performance of the module by speeding up the filtration process.

1. A filter module comprising a bearing shell in the form of a cylindrical tube, a shaft disposed in the cavity of the housing, and a filter element, comprising at least one Autonomous unit replaceable annular filter bushings and mounted coaxially with the housing, outside of it to form between them a radial gap, slide bearings, fixed mounted in the axial direction between the shaft and the inner cylindrical surface of the tool body rotatable shaft in them, at least one centralizer, located coaxially between a bearing housing and a filter element adjacent to the cylindrical surfaces of the tool body and the filter element, and device for optimal compression of the filter element in the axial direction, is provided with at least one spacer ring disposed at the junction of the filter element with upper and lower flanges of the module, wherein the supporting body is rigidly connected your tornami upper and lower flanges from the side of the submersible pump Assembly and tighten hydronamic submersible motor, respectively, an annular sleeve of filter elements mounted in series along a lifting body with a dense adjunction to each other annular end faces, and as a filtering material drawn wire of non-woven material, or "metallorubber", or pressed metal thread waste, permeable or porous material, characterized in that the filter module is additionally provided with at least one gripping sleeve with a locking mechanism, coaxially mounted on the outer surface of the tool body, at least one additional spacer ring disposed at the junction of adjacent blocks of the Autonomous replaceable annular filter bushing mounted on the outer surface of the tool body, and provided with, at least one radial groove, the open side of the tool body, provided with a coaxial shaft with spacer devices formed in the cavity between the shaft and the inner surface of the tool body, for example, in the form of individual pipe segments placed along the filter module between the bearings and the upper flange of the module in the connection zone with submersible pump provided with a cylindrical cavity communicated with the inlet of the submersible pump cavity, and the longitudinal channels made with the possibility of messages of this cylindrical cavity with kolicevo� cavity between the bearing housing and the filter element, each clamp is made in the form of an annular frame, preferably thin-walled, having a cross-section with adjacent projections and depressions in the radial direction, and is mounted abutting protrusions to the inner surface of the filter element, and valleys to the outer surface of the tool body along the entire axial length of the centralizer, the inner cylindrical surface of each gripping sleeve is provided with at least one radial groove, the open side of the tool body and is made with the possibility of formation of at least one of a through longitudinal channel of the gripping sleeve, the bearing housing of the filter module in the area of each bearing is provided, at least one radial channel, and in the area of each gripping sleeve bearing housing is provided with a radial hole is placed with the possibility of formation of the unique details of each gripping sleeve and a bearing housing of the filter module through the corresponding locking mechanism installed on one portion in the radial hole of the tool body and the other part - in the end of the radial grooves on the inner cylindrical surface of the gripping sleeve, the open side of the tool body, wherein the outer sleeve bearings fitted to�lawye grooves and seals, located in adjacent to the inner cylindrical surface of the tool body, and the segments of the spacer tubes in the radial channels of the tool body is provided with overflow holes.

2. Filter module according to claim 1, characterized in that the inner cylindrical surface of each gripping sleeve is provided with evenly it distributed radial recesses are open from the side of the tool body and through the entire length of the gripping sleeve and are arranged parallel to its longitudinal axis with the possibility of discrete abutting sections between adjacent radial grooves to the outer cylindrical surface of the tool body of the filter module.

3. Filter module according to claim 1, characterized in that the outer cylindrical surface of each gripping sleeve is provided with projections associated with each of them and are made with an outside diameter preferably greater than the outer diameter of the filter element.

4. Filter module according to claim 1, characterized in that the locking mechanism of each gripping sleeve is made preferably T-shaped.

5. Filter module according to claim 1, characterized in that the outer surface of the upper flange of the module is provided with projections associated with him and are made with an outside diameter preferably exceeding�surrounding the outer diameter of the filter element.

6. Filter module according to claim 1, characterized in that the annular frame of the centralizer with adjacent projections and depressions in a cross-section made in the form of non-closed elastic metal strip.

7. Filter module according to claim 1, characterized in that the annular frame of the centralizer with adjacent projections and depressions in a cross-section formed as a closed elastic metal strip.

8. Filter module according to claim 1, characterized in that the annular frame of the centralizer with adjacent projections and depressions in the cross section in the form of metal mesh.

9. Filter module according to claim 1, characterized in that the centers of the circumferences of the surfaces of the radial recesses of the gripping sleeve, the open side of the tool body are located in the area of the outer cylindrical surface of the tool body.

10. Filter module according to claim 1, characterized in that adjacent protrusions on the outer cylindrical surface of each gripping sleeve and adjacent the projections on the outer surface of the upper flange of the module is at an angle, preferably equal to 60-90 degrees.

11. Filter module according to claim 1, characterized in that the radial recess in additional o-ring, located at the junction of adjacent blocks adjacent Autonomous annular filter sleeves made through the entire length of the thrust�wow ring.

12. Filter module according to claim 1, characterized in that the seal bearings that are located in the grooves in their outer sleeves adjacent to the inner surface of the tool body made of swelling in a production environment elastomeric composition, for example, rubber-based EPM-T.

13. Filter module according to claim 1, characterized in that the spacer device made in the form of tubes disposed in the cavity between the shaft and the inner surface of the tool body between the slide bearings can be equipped with by-pass channels.



 

Same patents:

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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 // 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

FIELD: oil and gas extractive industry.

SUBSTANCE: device has hollow body, filtering elements with slit-like grooves, made in body wall due to intersection of screw grooves on its outer surface with longitudinal grooves on its inner surface and deforming of shelves on outer surface of body. Surfaces of shelves, forming slit-like grooves, are parallel to each other, shelves are provided with angular slants and grooves, made on outer surface. Method for manufacturing well filter, including making screw grooves on outer surface of body, and longitudinal groves on its inner surface, intersecting with one another, includes making screw angular slants on shelves prior to their plastic deformation with angle value equal to 1-45° relatively to pipe axis, and on middle portions of shelves screw angular grooves are made with angle value 90°-170° relatively to axes of transverse sections of body through angle vertices, while sides of angles are placed symmetrically relatively to axes of body transverse sections through angle vertices.

EFFECT: higher product quality, stabilized well productiveness, increased well filter service duration.

2 cl, 4 dwg

Well filter // 2254420

FIELD: mining industry, particularly water, oil or gas well equipment.

SUBSTANCE: well filter comprises perforated case, support rods and profiled wire coils or ganged plastic or propylene rings defining horizontal slots widening in filter inward direction. The coils or rings have rectangular cross-sectional edges. Lower ones are inclined at an angle to horizon corresponding to natural slope of bed rock or gravel filling in filtering agent medium.

EFFECT: possibility of system operation optimization.

1 dwg

Well filter // 2254421

FIELD: mining industry, particularly filters for injection wells for underground leaching, bed flooding and burial of waste in deep horizons.

SUBSTANCE: well filter comprises perforated case, support rods and profiled wire coils or ganged plastic or propylene rings defining horizontal slots widening in filter outward direction. The coils or rings have rectangular cross-sectional edges. Upper ones are inclined from outer side at an angle to horizon corresponding to natural slope of bed rock or gravel filling in filtering agent medium.

EFFECT: possibility of system operation optimization.

1 dwg

Well filter // 2256780

FIELD: oil industry, particularly means to prevent sand appearance in well and sand ingress into acting well pump.

SUBSTANCE: well filter comprises tubular filtering means including metal body with perforated part and two fastening members for filtering means securing inside casing pipe. Fastening members are made as rubber sealing collars closing perforated zone of the casing pipe from both sides thereof in axial direction and opening flow of fluid obtained from well to the filter. Body consists of two parts releasable along diameter. The parts may be securely pressed to casing pipe and include above sealing collars. Body part area located under the sealing collar has plasticity exceeding that of above perforated part, which is formed of metal with increased hardness. Filter provides free passage of special equipment through filter cross-section for simultaneous or alternate development of upper or lower production beds.

EFFECT: simplified structure, increased reliability of filter installation and operation.

1 dwg

Well screen // 2258131

FIELD: oil production industry, particularly devices preventing ingress of formation sand and propane with extractable formation fluid from bottomhole formation zone into well.

SUBSTANCE: well screen comprises perforated tube and filtering member with pore dimensions increasing in radial direction from outer screen surface to inner one. Filtering member is installed coaxially to perforated tube surface and made of foamed metal having three-dimensional cellular structure. Cellular structure includes many-sided cells with permeable faces so that solid sand filter of deposited particles may be formed inside foamed metal. Deposited particles are mechanically attached to randomly oriented ribs and faces of the cellular structure.

EFFECT: increased filtering performance.

2 dwg

Borehole filter // 2258786

FIELD: mining industry, particularly equipment for water intake, oil and gas wells arranged within the interval of production bed made up of soft rock.

SUBSTANCE: borehole filter includes perforated body, filtering jacket made of independent sections with wire winding, packing members and end sleeves connected to perforated body. Filtering jacket is formed of easy-drillable material, for instance of polyethylene or propylene. End sleeves are connected with perforated body by means of shear pin. Packing members of filtering jacket are made as perforated tubes connected to end sleeves. Perforated body has solid outer surface and provided with blind tube having double connection coupling including outer member having tool-joint thread hand orienting in the same direction as that of perforated base, and inner member having opposite tool-joint thread hand.

EFFECT: improved maintainability and increased efficiency of well repair.

3 cl, 1 dwg

Well filter // 2259472

FIELD: mining and oil- and gas-production industry, particularly for oil well development.

SUBSTANCE: well filter has tube with orifices arranged in helical rows on tube side and shear plugs installed in the orifices. Filter also has at least one filtering net and protective case, which are concentric to the tube. The case comprises orifices and is composed of several sheets located in end-to-end mode along the full tube length. Longitudinal butts between the sheets and orifice rows of adjacent sheets are mutually displaced in circumferential direction. Orifices made in protective case and in tube may be shifted one relative another. Ends of the case and filtering net may be closed with limiting rings secured to the tube. Filtering net with fine cells may be installed between two layers of nets with coarse cells. Plugs may be hollow. Total area of orifices made in protective case may exceed cross-sectional area of the tube.

EFFECT: increased oil recovery, filter performance and efficiency of extractive product cleaning of contaminants.

6 cl, 3 dwg

FIELD: oil and gas wells, particularly to reduce longitudinal fluid flow through hole annuity.

SUBSTANCE: method involves installing at least one resilient sealing ring around permeable pipe before lowering thereof into the well; holding the ring into compressed state around the pipe with the use of band or/and binding member which is gradually solved in well medium; installing permeable pipe in supply well area; providing band or/and binding member solving to provide expansion of at least part of sealing ring in radial direction in hole annuity surrounding permeable pipe. Sealing device has a number of sealing rings spaced equal intervals and installed on permeable pipe inside the well. Each sealing ring has one end permanently connected with outer pipe wall and another resilient end formed as a flange.

EFFECT: increased efficiency.

6 cl, 4 dwg

FIELD: well drilling and completion.

SUBSTANCE: device has expansible tube having wall with a number of through cuts. Some cuts are formed of bent compressed members and may expand in radial direction. Expansible means has bistable cells creating tubular structure. Each expansible cell has thick compressed member and bent pliable link, which may be converted into expanded state. Axial tube length is constant during tube expansion. Expansible system comprises means connected to communication line for information receiving.

EFFECT: reduced force for tube expansion from radially compressed state.

49 cl, 45 dwg

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