Downhole filter with flushing without surfacing. RU patent 2504644.
 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. |
 System of fire safety water intake / 2490042Invention refers to fire safety systems, and namely to water intake systems. The system comprises a water-intake head, two pumps, stop valves with an anti-sand filter, manifold pipelines along a building, vertical risers with fire hydrants. The anti-sand filter comprises concentrically arranged inner and outer pipes, an adapter. The inner and outer pipes in the upper part are connected to each other with tangential nozzles. The inner and intermediate pipes in the lower part are connected to each other also with tangential nozzles, but aligned oppositely. The circular gap between the intermediate and inner pipes in the upper part, and also upper and lower parts of the inner pipe are equipped with plugs. The external pipe in the upper part is equipped with elastic rings, and with a plug in the lower part. The intermediate pipe is equipped with a filtering element installed inside and made as a perforated reverse cone with perforation ratio from 50 to 85%, and arranged axisymmetrically to the intermediate pipe. |
 Well strainer / 2486332Device consists of tubular casing with threaded ends and punched holes and metal casing in the form of shell with punched holes made as slots of squamous shape. The housing is made with protruding under beginning and end of each slot. The upper part of protrusion in each squamous slot has a shelf. |
 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: 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
The invention relates to the oil industry and may be used in the pump extraction of oils with a high content of suspended solid particles (solids)removed from the reservoir.
For wells, producing oil, known filter, consisting of concentrically located outside of the intermediate and inner tubes, the latter with openings and bottom sub, the internal pipe is provided inside her filtration mesh, made in the form of the screw attached opposite holes arranged in a helix. In addition, external and internal pipe in the upper part of the interconnected tangential pipes, and internal and intermediate pipes at the bottom of the interconnected also tangential connection, but oppositely oriented, with an annular gap between the intermediate and inner tubes in the upper part, and the upper and lower parts of the inner pipes are fitted with plugs outer tube in the top of the supplied with elastic rings, and at the bottom cover (patent RU №2158358, IPC 21 43/08, 1999).
The advantage of this filter is accommodation in the inner pipe filtration mesh, made in the form of the screw attached opposite holes arranged in a helix, the holes are intended for switching of mechanical impurities in the annular space between the inner and intermediate pipes, and move them under the action of gravitational forces in the lower part of the filter. The disadvantage of analog is the abrasive deterioration and destruction filtering nets in connection with their zakuporka and slow cleaning from mechanical impurities as the lack of a low coefficient of separation of mechanical impurities.
Known self-cleaning filter downhole consisting of concentrically located outside of the intermediate and internal pipes, with the latter two have apertures and in the upper part are connected by a pipe, with the outer pipe both its ends connected with intermediate circular pipe plugs (patent RU 2305756, 21 43/08, 2007). Internal the pipe is provided with a filtering element placed in the interval holes performed on the pipe, the pipe is provided funnel and is linked with the longitudinal ribs, the bell is with a gap relative to the intermediate pipes and supplied at the bottom of the nozzle, and in the annular gap between the inner and intermediate pipes aligned with them placed filter element, made in the form of reverse of a truncated cone and attached to the data pipes above the upper holes formed in the middle hole of the intermediate pipes opposite flare and are equipped with a filtering element, funnel is also equipped with a centralizer. This filter has a complex structure. In case of clogging of the filter element, fluid flow pump stops, the need to replace the filter.
Closest to the invention is filter downhole, including a metal tube with holes, equipped with bottom cover, placed inside a metal tube with a gap and coaxially with her filter element, differs in that the filtering element is made in the form of a cylindrical pipe, the alignment of the filter element provided centralizers), metal pipe is equipped with top coupling, which features a spring loaded valve, the coupling has longitudinal crossing holes and hydraulic channel, consisting of two halves, with the first half of the channel, equipped with ball valve, coincides with the axis of downhole filter, and the other half is made perpendicular to it and does not intersect the longitudinal crossing holes, and the bottom of the metal tube contains a hole above the stub (RF patent №2355876, IPC 21 43/08, published: 20.05.2009).
However, when the blockage of the filter also it should be replaced by lifting equipment.
The purpose of the proposed invention is to provide washing of the filter without lift in underground equipment of the pump unit.
This goal is achieved by the fact that in the known device that includes pipe-shank mounted on the pump intake and cutting through packer, intermediate pipe, capped at the top, forming a shank capped at the bottom of concentric cavity, pipe storage for solid particles, cylindrical filter element, located between the shank and pipe-drive, spring loaded valve placed inside the intermediate pipe concentric cavity has radial channels that are directly above and below the packer, under the lower radial channels in the intermediate pipe are horizontal jumper with holes, between which the connecting pipe is a through hole, on both sides, horizontal jumpers are set spring top and bottom valves, rigidly connected rod, and above the upper spring valve is leaking piston same with the top valve diameter, the elasticity of the upper spring exceeds the lower elasticity.
Figure 1, 2, 3, 4, 5, 6 and 7 show the concepts and different types of the proposed filter.
The keyhole 1 on the columns of the tubing 2 and 3 bars lowered pump 4 with shank 5, United with his reception. Shank 5 passes through packer 6, to which bottom is fixed a pipe-drive 7 to collect SSC (SSC), coming in well with the product formation.
Pipe 7 mute the bottom and has 8 holes for the entry of products from the reservoir. Inside shank posted 5 connecting pipe 9, forming concentric cavity 10. Above and below the packer in the cavity of 10 are respectively the radial channels 11 and 12, and a trumpet 9 at the top of the " jumper 13 so that the cavity 10 has a message with the intake pump 4 through external channels in 11. Below channel 12 in the intermediate pipe 9 are horizontal jumper 14 and 15 with the hole. Between the ridges 14 and 15 in the intermediate pipe 9 are made through holes 16 and report internal cavity 9 with a cavity 10. Outside shank 5 installed a cylindrical filter element 17. This element is connected with packer 6 and together with the cavity of 10 in the lower part is covered by a jumper setting 18.
Inside the intermediate pipe 9 over the bridge 14 are non-hermetic piston 19 20 valve of the same diameter and spring 21 between them. Under bridge 15 installed valve 22 23 pillar and wall Windows 24 and spring 25.
Valves 20 and 22 are rigidly connected among themselves rod 26. In the pipe before 9 11 channels installed limiters 27 vertical movement of the leaking of the piston 19. Wellhead installed cranes 28 fluid in the pipeline and 29 of the fluid into the well annulus.
Spring 21 has great elasticity in comparison with the spring 25.
The filter consists in the following. In the well 1 carry out the descent of the pump 4 with shank 5, packer 6, trumpet 7 and the rest of the elements of the filter. When you start well leaky piston designs 19 and 20 valve in the pipe 9 allows fluid to flow through channels 12 and 11 in the annulus and install the specified dynamic level. In the running well, the reservoir fluid passing through the hole 8, gets on the outer surface of the filter element 17 and freed from the solid particles arrives to receive a pump 4 through 12 channels, 16, cavity 10 and the outside of the channels 12 and 11 (1 and 3). The opening jumpers 15 blocked valve 22 thanks to a spring 25. Piston 19 20 valve in this period are in extreme top position with a fully spring 21. Finding the piston 19 20 valve in extreme top position is provided by a spring 25 through the rod 26.
Tap 28 in this period remains open, and the crane 29 closed.
If there is blockage of the filter element 17 there will be a decrease pump 4. To clean the filter from the HDTV by rinsing of the filter element, 17 (2 and 4). To do this, if the pump 4 is realized by injection into the well annulus through the valve 29 washing fluid (light oil, solvent and other). Washing fluid through channels 11 hits the piston 19 and high-speed pressure press it down, along with 20 valve rod 26 and valve 22. When he reached the hole jumpers 14, 20 valve block it, and the valve 22 opens the hole in a dam 15. Further injection of drilling fluid will lead to compression of the spring 21 and shortening the distance between the piston 19 and 20 valve. After the upper surface of the piston 19 falls below the top of the channel 12, washing fluid will flow in channels 12 and further in filter element 17 with its internal side. Thanks to the reverse current of a liquid through item 17 of the last cleared from HDTV, adhere with its outer side. Then liquid together with HDTV flows to the pipe-drive 7 and changing the direction of movement of the 180 degree enters the intermediate pipe 9. Turn liquid 180° allows due to centrifugal forces freed from HDTV that under its own weight will settle to the bottom of the pipe-drive 7. The liquid passing through the window 24, hole in a dam holes 15 and 16 goes further in the cavity 10, where through the external side of radial channels 12 and 11 also fed to the suction of the pump 4.
After rinsing of the filter supply of drilling fluid stops and crane 29 closes. Spring 25 and 21 will force the piston 19 and valves 20 and 22 go back to its original position now. Pump 4 will begin to operate in normal mode with cleaning fluid from HDTV. When full, the tube 7 after prolonged operation wells solids washing of the filter will not lead to its clearing. In this case, is the rise of underground equipment with the purpose of release of pipes from 7 TWh.
Technical and economic advantage of the invention is to provide leaching filter from the HDTV without lift pumping equipment, as well as to prevent the clogging of the hole resulting from the formation of solid particles breed.
Filter downhole with washing without lifting equipment, including pipe-shank mounted on the pump intake and passing through packer, intermediate pipe, capped at the top, forming a shank capped at the bottom of concentric cavity, pipe storage for solid particles, cylindrical filter element, located between the shank and pipe-drive, spring loaded valve placed inside the intermediate pipe, wherein, with the aim of ensuring the washing of the filter without lift in underground equipment of the pump unit, concentric cavity has the radial channels that are directly above and below the packer, under the lower radial channels in the intermediate pipe are horizontal jumper with holes, between which the connecting pipe is a through hole, on both sides of horizontal jumpers are set spring top and bottom valves, rigidly connected rod, and above the upper spring valve is leaking piston same with the top valve diameter, the elasticity of the upper spring exceeds the lower elasticity.