Well filter. RU patent 2509206.
 Borehole aperture filter / 2507384Aperture 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. |
 Downhole filter with flushing without surfacing / 2504644Proposed 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. |
 Downhole split filter / 2504643Proposed 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. |
 Well strainer / 2499130Device 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. |
 Flow control filter for use during oil-field operation / 2495997Device 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. |
 Screened pipe / 2492314Device comprises concentrically arranged outer and intermediate pipes, a reducing taper elbow. The outer and inner pipes in the upper part are connected between each other with tangential nozzles. The inner and outer pipes in the lower part are connected to each other also with tangential nozzles, which are aligned oppositely. The circular gap between the inner and outer pipes in the upper part, as well as the upper and lower parts of the inner pipe, are equipped with plugs. The outer pipe in the upper part is equipped with elastic rings, and in the lower part - with a plug. The intermediate pipe is equipped with a filtering element installed inside it and arranged in the form of a perforated back taper with a perforation coefficient from 50 to 85%, and arranged in an axisymmetrical manner to the intermediate pipe. Inside the taper there is at least one filtering element installed, which is made in the form of a perforated cylinder with perforation ratio from 80 to 90%. |
 Devices and method to install gravel filter in borehole / 2492313Device comprises a body having an upper support part and a shoe, a passage, at least one first and second holes of the body, at least one filter installed in the body, a tool installed movably in the passage of the body, having a passage with at least one hole and moved into the first selective position in the passage of the body, isolating at least one hole in the tool with at least one first hole in the body towards the shoe, and moving the suspension from the passage in the tool to the borehole, and moved into the second selective position, isolating at least one hole in the tool with at least one second hole in the body in direction to the upper support part of the tool. |
 Strainer for well in underground gas storages / 2490433Device consists of a body with bands at the ends that cover final turns of a wire forming an outer screen wound onto stringers located at exterior surface and spaced equally along the perimetre thus forming a filtering slot. Inside the body there are at least two circulating holes covered by casings. The body is equipped with at least two collars installed above casings and under location of circulating holes. Casings are equipped with holes and process grooves at exterior surface. In grooves there are one-way cup-type valves which are capable to cover holes located at the level of circulating holes in the body. |
 Method of well strainer fabrication / 2490432Tubular body with threaded ends is perforated and installed at exterior surface of a casing with squamate slots finished up to a nominal size by rolling of the casing between rollers. Rolling of the casing between rollers is made till protrusions are formed at the beginning and ending of each slot and a cap appears at upper protrusion of each squamate slot. The gap between rollers is equal to double thickness of a rolled sheet plus 40-60 mcm, while diameter of a shape-generating driven roller is equal to 0.75-0.85 of the casing diameter. |
 Well strainer / 2490431Device contains a perforated body and thin polymer discs with discrete particles connected to one of their bases thus forming labyrinthine channels in between. Discrete particles are made as polymer pin of identical height; they are oriented perpendicular to the base plane. |
 Well filter / 2244103Device 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. |
 Well filter and method for manufacture thereof / 2245995Device 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. |
 Well filter / 2254420Well 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. |
 Well filter / 2254421Well 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. |
 Well filter / 2256780Well 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. |
 Well screen / 2258131Well 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. |
 Borehole filter / 2258786Borehole 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. |
 Well filter / 2259472Well 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. |
 Method and device for limiting longitudinal fluid flow around permeable pipes in well / 2260679Method 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. |
 Expansible means (variants), device and method of expansible means and device usage in drilling well (variants) / 2263198Device 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. |
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
The invention relates to the construction and operation of wells for various purposes and, in particular, oil and gas wells.
Known borehole filter installed in the casing string, including the hollow body with radial holes for liquid circulation, covered hollow shear pins protruding inside the hollow body, filtering unit, placed on the outside of the hollow body, and forming with them a ring cavity [1].
The disadvantage of the device is the low reliability due to insufficient sealing ability radial holes corps hollow shear pins. This is because fixing hollow shear pin radial openings on the device and their sealing is provided by thread, which in principle does not provide the necessary seal in such conditions.
The closest analogue of the invention is well filter that includes housing with radial holes, covered with a hollow shear pins protruding into the body, equipped with sealing rings and enshrined in the radial holes body through stamping or flaring edges of the walls of the hull [2].
The disadvantage of this device is its low sealing ability, not more than 6 MPa, when creating internal overpressure inside the lander in the hole transport columns, for example, casing. During the descent borehole filter transport column can be «sticking» of this column and education «seals». When washing the transport columns with circulation through its «Shoe» internal excessive pressure in the column can be up to 10 MPa and more. When this situation occurs, hollow shear pins inevitably razgermetizatsija and washing will be impossible.
The technical result of the invention consists in increasing the reliability of the device.
The necessary technical result is achieved by the borehole filter includes a hollow body with radial holes covered with tightness hollow shear pins, filtering unit, placed outside the frame and forms with the latest ring cavity, which is hydraulic messages with the cavity of the body through the hollow shear pins in the operating positions with the device, but each of the hollow pin is made in the form of a glass bottom placed within the body, and the lateral surface, having the outer ledge, fixing the glass outside of the hull, and the external transverse corrugation, fixing the glass opposite - inside and allowing hydraulic perturbations of fluid flow in the parietal area of the body cavity, adjacent to the hollow shear pins.
In addition:
the outer ledge of the outer side of each of the glasses and the surface of the housing wall form an annular working cavity, where the sealing element;
each of corrugated and outer ledge on the side of each of the glasses advanced form axial preload in the last radial bearing housing.
The invention consists in increasing the reliability of sealing radial holes body, covered hollow shear pins. Existing structures similar devices withstand limited surplus pressure created during the wash well, are required to deliver the device in its transport position to the specified depth. In addition, the known device and do not provide the necessary mechanics clean cut hollow pins, overlapping radial holes hollow shell. If there ragged adjacent surfaces in pipe bore corps occurs unnecessary operations at the study of bore wells in the device. The proposed device provides the possibility of substantial increase of pressure in the unit, at least on 50%. This is ensured by the availability of cross bumps on each of the hollow shear pins - a kind of stiffening rings, increases the stability of the forms mentioned pins from the outside thrashing pressure. With resistant forms, without increasing the thickness of the walls, the necessary tightness mentioned pins and reliability of their cutting. Increase the degree of tightness is preloaded in the radial and axial directions that easily, in this case may be supplied, provided by the mechanics of the installation - mounting hollow shear pin radial openings on the device. This ensured mechanics clean cut hollow pins due to the possibility wash mode turbulence in the flow or in the mode close to him. Such conditions provide the presence of transverse flute on the side of each of the hollow shear pins, changing the value of the orifice of the body and location feature cross-bumps - their contiguity to the edge of the inner surface of the hollow body. The necessary geometry cross bumps can be ensured by the settling of bumps in the axial direction when installing hollow shear pins. No salamouny or crusted areas within the area hollow shear pins mechanics provides a clean cut hollow shear pins without additional kinds of deformation, for example, bends, bending, jams, leading to the formation torn surfaces on the remaining parts are pressed hollow shear pins.
Figure 1 shows the General view of the device.
Figure 2 shows its unit - hollow shear pin.
After installation the device against the productive formation perform the final rinse the wells solution hydrocarbon-based. The presence of transverse bumps in the penetration of the axial section of the device provides for a given flow rate required flow turbulization in the device and reliable surface cleaning hollow shear pins. The availability of cross-bumps - changes in sections detects the presence of stress concentration in these places. In this case, the concentration of these stresses in a greater degree will appear on the contact transverse corrugation with the inner edge of the Cabinet determined by the diameter of the cap, 5-7 mm smaller internal sections of the hull. This cap (the drawing is conventionally not shown) down in the casing of a well at the working column, for example, of pump-compressor pipes to communicate with hollow shear pins. At interaction of headgear with hollow shear pin is damaged. Perform the opening of a productive layer of the well. Well and reservoir fluid is transmitted through filtering unit and the radial holes 2 on the inside of the housing 1 and casing. Create depression in the casing by a reduction in her level of liquid, clean the reservoir from residual products of sedimentation. After that proceed to trial operation.
Sources of information
1. EN 2182960, 27.05.2002,
2. Filter horizontal wells: Advertising Avenue AEO «Tyazhpressmash», Ryazan, 1995 (attached).
1. Shinny filter that includes a hollow body with radial holes, covered with tightness hollow shear pins, filtering unit, placed outside of the casing and binds the last ring cavity, which is hydraulic messages with the cavity of the body through the hollow shear pins in the operating positions with the device, but each of the hollow pin is made in the form of a glass bottom placed within the body, and the lateral surface, having the outer ledge, fixing the glass outside of the hull, and the external transverse corrugation, fixing the glass opposite - the inner side of the chassis, and ensure the possibility of hydraulic disturbances of fluid flow in the parietal area of the body cavity, adjacent to the hollow shear pins.
2. Well filter according to claim 1, characterized in that the outer ledge of the outer side of each of the glasses and the surface of the housing wall form an annular working cavity, where the sealing element.
3. Well filter according to claim 1 or 2, characterized in that each of corrugated and outer ledge on the side of each of the glasses advanced form axial preload in the last radial bearing housing.