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IPC classes for russian patent Well filter (RU 2259472):
Another patents in same IPC classes:
 Borehole filter / 2258786
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.
 Well screen / 2258131
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.
 Well filter / 2256780
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.
 Well filter / 2254421
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.
 Well filter / 2254420
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.
 Well filter and method for manufacture thereof / 2245995
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.
 Well filter / 2244103
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.
Composition for reservoir consolidation and for filter case filling inside well / 2258798
Composition comprises binding agent, additive, structure-forming agent and water. Binding agent is polyurethane hydrophilic pre-polymer, structure-forming agent is sodium chloride free from hydration water, additive is sand. All above components are taken in the following amounts (% by weight): polyurethane hydrophilic pre-polymer - 7-15, sodium chloride - 18-48, sand - 24-55, water - remainder.
Borehole filter / 2258786
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.
Well filter / 2256780
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.
Well filter / 2254421
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.
Well filter / 2254420
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.
Well filter and method for manufacture thereof / 2245995
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.
Well filter / 2244103
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.
Well filter / 2244103
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.
Well filter and method for manufacture thereof / 2245995
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.
Well filter / 2254420
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.
Well filter / 2254421
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.
Well filter / 2256780
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.
Borehole filter / 2258786
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.
Composition for reservoir consolidation and for filter case filling inside well / 2258798
Composition comprises binding agent, additive, structure-forming agent and water. Binding agent is polyurethane hydrophilic pre-polymer, structure-forming agent is sodium chloride free from hydration water, additive is sand. All above components are taken in the following amounts (% by weight): polyurethane hydrophilic pre-polymer - 7-15, sodium chloride - 18-48, sand - 24-55, water - remainder.
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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
The invention relates to the mining industry, namely oil and gas, and can be used in the development of oil wells.
Known downhole filter A.S. USSR №1788219 containing a perforated pipe and a removable ceramic elements mounted on the outside of the pipe. The drawback of this filter is the need for periodic replacement of the filter elements and low strength under bending loads.
Known downhole filter A.S. USSR №1754884 containing the filtering element in the form of arc plates, with the filtration slits. In addition to the disadvantages of the above described filter, the filter is difficult to assemble, as it contains a large number of small parts, made with high accuracy.
Known downhole filter A.S. USSR №1645470 containing laid on a perforated cage wire filter element. This filter does not work when bending loads: on the one hand the flow area of the slits during bending is reduced, and on the other increases, and the filter passes a larger fraction of impurities. This increases the wear and tear of equipment, pumping oil.
Known downhole filter RF patent No. 2108447 containing pipe pressure is cut off by traffic. A string of casing with the filter is lowered into the well. Well Cementir the t above the filter. After setting of the cement slurry into the well down the column tubing with a funnel. Well washed. Cut the funnel ends of the tubes. The wells are washed again. Lasermedizin the reservoir and at the same time allowed the well.
The disadvantage of this filter is a low degree of filtering, which is limited by the diameter of the holes in the tubes.
Known downhole filter of St. the Russian Federation for useful model No. 16758, prototype. This filter contains a tube in the hole which is installed in the tube, the filter mesh and the cover holes. Holes in the pipe and the casing is made rows on the side.
The effectiveness of the centering casing pipe installed at the bottom of the filters in the wellbore depends on Zenith angle. With increasing Zenith angle of the hole increases the moment, aimed at the reversal of the column in a vertical position. It also increases the load of the weight of the casing pipe on the bottom of the borehole wall. In horizontal wells, the effect of these factors leads to the fact that the footwall of the casing in the open hole fully in contact with the rock. The bottom row of holes of the filter become clogged with soil and does not work. This increases the hydraulic resistance and reduces the flow rate at 15...25%.
When owls is Adeney holes in the pipe and the protective cover is reduced filtration efficiency, which leads to rapid wear and failure of the oil field equipment.
The task of the invention: enhanced oil recovery by reducing the hydraulic resistance and increases the bandwidth of the filter, improving the efficiency of purification of the extracted product from impurities.
These tasks are achieved due to the fact that the downhole filter containing pipe, performed on its lateral surface with rows of holes, which is hermetically installed cutting tube, at least one filter grid and the protective cover with the holes, mounted concentrically on the pipe, while the protective cover is made of several stacked end-to-end along the length of the tube sheets, with the longitudinal joints of sheets, as well as rows of holes on adjacent sheets are offset relative to each other in the circumferential direction. Holes in the protective casing and the tube are displaced relative to each other. The ends of the specified casing and the filter mesh with the ends closed restrictive rings fixed on the pipe. Filtering net with small cells installed between two layers of filter grid with large cells. The tube can be made hollow. The square holes of the protective casing is preferably more of the cross-section area of the pipe.
Research patent the scientific literature has shown, the proposed technical solution has novelty, inventive step and industrial applicability. A similar set of essential features is new and not previously used, which in turn allows to make a conclusion about the technical solutions according to the criterion of "novelty". The proposed solution also has the criterion "industrial applicability"because the filter can be manufactured using standard equipment of nidificate materials. A significant sign of the fulfillment of the holes on the pipe spiral rows is known from the patent of the Russian Federation No. 2190731.
The invention is illustrated in the drawings, figure 1...3, where:
figure 1 shows the downhole filter section
figure 2 - external view of the downhole filter
figure 3 - cross section of a downhole filter
The downhole filter consists of a tube 1, into the holes on the side surface in which the hole "And" established a tight cutting tube 2. Trumpet 1 concentric she has a protective perforated cover 3, and between the tube 1 and the protective perforated cover 3 is installed at least one filter grid 4. On the surface of the protective cover 3 is made of several rows of holes "B". Hole "B" and "A" are not the same. In this series of holes "B" is executed on a screw line, that at us is the time filter in the horizontal well prevents the overlap of the bottom row of the breed. The material of the filtering nets 4 - stainless steel. A grid of small cells placed between the filter grids with large cells, it reduces the voltage cutoff on a thin wire filter mesh with small cells. The protective cover 3 is made of several sheets 5, the coupled between the circular joints. Longitudinal joints "G" spaced relative to each other, which provides a helical arrangement of the rows of holes "B" and the main positive effect. The ends of the protective cover 3 is fixed in a restrictive rings 6, which prevents the collapse of the protective casing 3 when transporting and lowering into the well.
Well the filter works as follows. Before operating the downhole filter is installed in the column casing TRU, well cement above the filter. Then cut the tube 2 by mechanical means or etched with acid, in the latter case they should be made of acid-soluble material.
The application of the invention allowed:
1. To increase the degree of purification of the extracted product from impurities.
2. To maintain downhole filters during the entire life of the well.
3. To improve efficiency.
4. To increase the area of the orifice.
5. To reduce the hydraulic resistance.
6. To increase the recovery rate.
1. The downhole filter containing pipe, performed on its lateral surface with rows of holes, which is hermetically installed cutting tube, at least one filter grid and the protective cover with the holes, mounted concentrically on the pipe, characterized in that the specified series - spiral, the protective cover is made of several stacked end-to-end along the length of the tube sheets, the longitudinal joints which, as well as rows of holes on adjacent sheets are offset relative to each other in the circumferential direction.
2. The downhole filter according to claim 1, characterized in that the holes in the protective casing and the tube are displaced relative to each other.
3. The downhole filter according to any one of claims 1 and 2, characterized in that the ends of said casing and the filter mesh with the ends closed restrictive rings fixed on the pipe.
4. The downhole filter according to any one of claims 1 to 3, characterized in that the filtering net with small cells installed between two layers of filter grid with large cells.
5. The downhole filter according to any one of claims 1 to 4, characterized in that the said tube is made hollow.
6. The downhole filter on any of their claims 1 to 5, characterized in that the area of the holes of the protective cover more of the cross-section area of the pipe.
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