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Well filter

IPC classes for russian patent Well filter (RU 2256780):

E21B43/08 - Screens or liners

E03B3/18 - Well filters (filters in general B01D0024000000-B01D0035000000)

Another patents in same IPC classes:

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 / 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.

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.

Screen filter (variants) and method for producing the same / 2271440
Screen 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 / 2272876
Filter 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.

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

The invention relates to the oil industry, in particular to methods of combating sand control in wells.

The known device for preventing the ingress of sand into the pump in the well, which are mounted on the pump intake in the form of filters or separators, which are based on the forces of gravity or inertia forces all methods of oil production, is the implementation of complex of measures aimed at preventing the sand flow from the reservoir into the barrel.

The most effective method of dealing with sand control during well operation is to install special filters at the bottom.

The main types of structures faces of the wells is given in the book of Ashrafian MO and other Improvement of the well bottom. M.: Nedra. -1987, are determined depending on the strength of the formation, the conditions of their occurrence.

Downhole downhole tubular filters can have different types of structures.

Wire welding filter is structurally in the form of a segment of pipe with regular perforations and a large number of longitudinal support rods, on which is wound profiled in the form of a trapezoid wire of alloy steel (see Perverted A.M. Protection of the downhole pump from the gas and sand. M.: Nedra. -1986. and Catalog NPO “Rosneft - Permneft DOAO Mash the building plant “Neftemash”, Filter protivopotochny of profiled wire FPT-146/168). A known type of filter can be mounted on the Shoe of tubing in the perforated interval of the well bore.

The disadvantage, as shown by operating experience, and wire - welded filters short-lived, rapidly destroyed due to abrasive wear and chemical effects on the primary filter element is a wire.

Another type of tubular downhole filter - based porous titanium filter element (see STC “Petroleum engineering”, No. 10, 1981, S. 35-39).

The lack of filter eliminates the disadvantages of the previous one, but carries other - accumulation in their long clay particles, the gradual silting and termination hydraulic conductivity.

The most reliable gravity filters, the use of which, according to the foreign and domestic experience (see Ashrafian MO and other Improvement of the well bottom. M.: Nedra, 1987.), in 85-90% of cases gives positive results. During the construction of the well after drilling the wellbore descends pre-perforated hidden column with the dimensions of the slits slightly larger than the particle size of the gravel. Then namyvayut to the column with the help of various liquid media with high viscosity gravel packing with the size of the om particles from 0.15 to 1.4 mm and the subsequent fastening of its agents or resins.

The creation of gravel or gravel - sand filter does not provide a full guarantee from the sand from the bottom zone of the reservoir, because over time, the gravel in the filter sags and compacted, opening perforated wall hidden columns, open cavity height can reach 29 % of the original height of the filter.

To solve problems with subsidence gravel filter gaskets for previously hidden column create a special permeable backfill materials for fixing poorly cemented collectors from and form a filter area on the bottom of a well.

Technical equipment of the most simple and reliable design of the downhole filter is a filter device spuskaemogo in the trunk wells (see STC “Petroleum engineering”, No. 10, 1981, S. 35-39). In the source are protivopolojnye filters with different types of filter elements which are installed in the wellbore on the Shoe tubing and without a rigid connection with the support on the bottom of the well and the packer, including downhole filter consisting of a tubular filter device comprising a metal casing with a perforated section, and the locking said device in the casing elements.

Analysis of the filters shows that most effect the main design is to install the filter with the packer, this is provided that the gravel packing for this filter can be formed naturally by filtration and accumulation of sand particles with a pre-specified size.

All of the above and considered design of filters deployed on the bottom wells directly in the reservoir cannot be used if necessary, simultaneous or another operating several productive strata one wellbore. The design of these filters provide so that the sand is made from the reservoir and the delayed filter accumulates below the closed filter productive zone, moreover, impossible to pass through the filters section to below - or overlying productive strata.

The purpose of the invention is to simplify the design and increase the reliability of the installation and operation of the tubular filter in the perforated zone of the casing by providing end-to-end free passage through the inner cross section of the filter along its axis for simultaneous or sequential operation of the lower or upstream reservoirs.

This objective is achieved in that in the downhole filter, consisting of a tubular filter device comprising a metal casing with a perforated section, and the locking device in the casing Colo is not of the elements, both the locking element is designed as a rubber sealing cuffs, overlapping on both sides along the axis of the casing the area of its perforation, opening access extracted from the reservoir of liquid to the filter housing has two coming in diameter and rigidly prizhimayuschie to the casing part with these cuffs, under which part of the building is more plastic than the perforated portion, made of metal of high hardness, while ensuring end-to-end free passage of special equipment through the internal cross section of the filter for simultaneous or sequential operation of the lower or upstream reservoirs.

The drawing shows a tubular protivopotochny filter, installed in the casing string.

The filter is installed in the casing with the help of special technical means used for installation of metal patches for major underground repair of casing strings.

In the casing 1 is mounted a tubular filter housing 2 with the first rubber cuff 3, the closing sleeve 8, the cutting perforations 4 in the casing, which is accumulated gravel packing 5. The filter housing is made of filter perforation 6.

The filter is as follows.

When you install both parts IU alicebraga housing 2 of the filter with rubber cuffs 3, 8 alternately distributed in diameter and tightly pressed against the casing 1. Metal filter housing throughout the area has a regular pass-through perforation 6, performed by a laser beam, all the holes are the same size, calculated on a mid size particles carried from the reservoir. For increased abrasion and corrosion resistance of the filter perforated portion 6 may be made of metal of high hardness and connect with more plastic part of the building under the rubber cuffs 3 by plasma or laser welding.

This design is well protivopolozhnogo filter allows operation in a well bore, passing through the open inner section below - or overlying layers. In this operating state of the filter is not changed, and he may continue to perform the function. Between the tubular housing 2 of the filter and the casing 1 in a cavity bounded on both sides rubber sleeves 3 and 8, naturally formed gravel packing due to accumulation of large sand particles, with the largest percentage in the mechanical phase, removed from the reservoir. At the same time prevents the sand in the wellbore and its accumulation in the wellbore area and sump wells. Since gr is Vina gasket is formed in a natural way, she is constantly in a dense state without cavities and flashes. If siltation of gravel zones or deposits of paraffin - tar filtration area can be treated by reverse flushing with special liquids. Seal rubber seal 3 and 8 allow sealing zone 7 to filter from the cavity of the wellbore limited vertical casing 1, without the use of expensive sealing devices, which simplifies handling and increases the reliability of the lter set.

The use of the present invention will allow simultaneously or alternately to operate below or overlying reservoirs.

The downhole filter, consisting of a tubular filter device comprising a metal casing with a perforated section, and the locking device in the casing elements, wherein both the locking element is designed as a rubber sealing cuffs, overlapping on both sides along the axis of the casing the area of its perforation, opening access extracted from the reservoir of liquid to the filter housing has two coming in diameter and rigidly prizhimayuschie to the casing part with these cuffs, under which part of the building is more plastic than the perforated portion, made of metal of high solids the spine, this provides end-to-end free passage of special equipment through the internal cross section of the filter for simultaneous or sequential operation of the lower or upstream reservoirs.