Well filter
 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. |
 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. |
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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. |
 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. |
 Screen filter (variants) and method for producing the same / 2271440Screen filter made in accordance with the first embodiment comprises basic pipe with orifices formed in side wall thereof and slidable netted pipe freely put on the basic pipe. The netted pipe is formed of netted structure including woven fiber layers laid one upon another and interengaging each other by needles provided with teeth. The netted structure closes the orifices made in basic pipe. Method for screen filter production involves making netted layers of woven fibers, laminating above layers; mutually engaging the layers to obtain netted structure with the use of needles having teeth for layer connection; forming netted pipe of above netted structure and installing the netted pipe on basic one provided with through orifices by freely putting the netted pipe on the basic one. The screen filter formed in accordance with the second embodiment comprises basic pipe with orifices formed in side wall thereof and slidable netted pipe put on the basic pipe. The netted pipe is formed of netted structure including layers of woven fibers laid one upon another and interengaging each other by needles. The needles have teeth. The screen filter at least partly surrounds downhole equipment unit. Netted structure also at least partly surrounds the downhole equipment unit and restricts foreign particles from entering into the equipment unit. |
 Water-supply well filter / 2272876Filter comprises frame composed of support rings with longitudinal rods and water-receiving surface formed as rectangular plates. The plates have the first ends of U-shaped projecting profile in contact area between the plates and the frame. The first ends are fixed by longitudinal rods. The plates are installed in radial planes relative the frame and extend along longitudinal rods. The plates are arranged in pairs, spaced apart and are provided with orifices formed in side surfaces thereof. |
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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. |
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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. |
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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. |
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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. |
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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 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. |
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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. |
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Well filter / 2259472 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. |
 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 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
The invention relates to techniques for oil and other liquids from wells and can be used in a filter device that prevents the sand from the reservoir into the well.
Known downhole slotted tubular filter containing multilayer filter element, mounted on the frame element, two pipe adjacent to the ends of the filter element and having a suitable connection ends, and connecting elements with accents on the upper and lower ends mounted coaxially within the filter and with a gap relative to him (as the USSR №1116144, MKI E 21 In 43/08, 1984).
The disadvantage of this filter is its loose fit to the production string, which leads to the removal of sand from the reservoir in prefiltrov zone, its accumulation in the annular space between the filter and the production column, the contact hole and filling it. The need for a systematic cleaning of the borehole from the sandy congestion increases the cost of its operation. The disadvantage of the filter is also the impossibility of removing it without damaging the integrity in case of sticking in the bore of precipitated particles of sand.
Closest to the present invention is downhole filter comprising a perforated body with a filter element, the outer surface is covered with a layer of filter fleecy material (A.S. No. 587242 the USSR, MKI E 21 In 43/08, 1978). In known multi-layer structure of the filter layer of napped material protects the filter element from clogging during its descent in the well bore during installation in the reservoir.
The disadvantage of this filter is that it does not hinder the sand from the reservoir, which leads to the destruction of the latter. The filter slows these processes due to partial restoration of fleecy material volume and shape after you release the filter into the well and thus to reduce the annular space between the production column and a filter element, which hits the sand.
The present invention solves the problem of increasing the efficiency of the downhole filter by preventing sand from the bottom zone in the production casing.
This technical result is achieved by the inventive downhole filter comprising a perforated body and a multilayer filter element is further provided with a torsion spring concentric located between the casing and the filter element and the filter element is configured to increase or decrease the size in the radial direction in the promotion or twisting of the spring.
1 shows a downhole filter service is th column in the off position when twisted spring - General view; figure 2 - filter in position when unwound the spring.
The downhole filter consists of a perforated casing 1, a multilayer filter element 2 and the torsion spring 3 is placed in the annular space 4. The spring 3 is designed in such a way that in the twisted state, the diameter of the coils does not exceed the internal diameter of the filter element 2 and between them there is a gap 5; 6, there is a gap between the filter element 2 and the production column 7, and the perforations 8 in the last opened (figure 1). In the untwisted state, the diameter of the coils of the spring 3 exceeds the inner diameter of the filter element 2, the latter pressed the coils of the spring 3 by operating the column 7 so that the perforations 8 therein overlapped (figure 2). Multilayer filter element may be made of layers of longitudinally-corrugated metal grid with varying degrees of filtering layers.
We offer well the filter works as follows.
The filter is placed in the container (figure 1, figure 2 not shown) in the form of thin tubes to protect from damage and clogging of the filter surface. The filter is installed in the container with the possibility of axial displacement without a badass outer layer of the filter element 2. Pre-spring 3 are formed before formation of the gap 5 and the disappearance of the mother is and between the coils 3 and the filter element 2. Then the filter Assembly down on the tubing through the production string in the productive interval of the formation. After descending to the place of installation of the filter remove the container. Then untwist the spring 3, the coils of the open inner layers of the filter element 2, the force is gradually transferred to the subsequent layers, select the gap 6 and the smoothing and fit with tightness of the outer layer of the filter element 2 to the walls of the casing 7 with overlapping perforations 8 (figure 2). Due to the tension provided by the force promoted the springs 3, the filter is held firmly in a production string 7. This purpose is served lip seals (not shown)made on the upper and lower ends of the filter with the ability to mate with the inner diameter of the production string.
When putting the well into operation layer fluid with mechanical particles is taken out from prefiltrov the zone of the reservoir and flows through the perforations 8 in the production string 7 to the outer surface of the filter element 2. The fluid passes through the filter layers 2 and the valve housing 1, is fed into the cavity of the filter and then rises to the surface. Most large particles are trapped on the outer layer of the filter element 2, overlying the perforations 8 in exploitatio the Noah column 7, and form the front of the filter 2 and the inside of the perforations 8 sandy cage. Smaller particles pass through the sand skeleton of the large particles and the outer filter layer and form a sand frame before the next filter layer and so on.
For specific fields depending on the characteristic of fractional composition of reservoir sand, as well as the requirements of the clean formation fluid filter can contain two and three of the filtering layer.
As well operation and filter created before the outer filter layer is a set of made of the formation of large grains of sand starts to work as “artificial” filter, preventing the movement through it smaller fractions of sand. The volume of “artificial” filter increases due to the involvement in the process of filtering the deep-lying layers of the bottomhole zone. Gradually the movement of the particles slows down and then stops. This strengthens the initially loose the reservoir, increases its portogaribaldi ability and prevents its destruction. The lower sand lengthens the service life of not only the downhole filter, but all underground equipment, thus increasing the turnaround time wells and efficiency of sampling formation fluid.
The downhole filter consisting of perforin the cell body and multi-layered filter element, characterized in that it further provided with a torsion spring concentric located between the casing and the filter element and the filter element is configured to increase or decrease the size in the radial direction in the promotion or twisting of the spring.