Well expandable screen |
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IPC classes for russian patent Well expandable screen (RU 2513929):
 Device for cleaning of basin from radioactive bottom sediments / 2513784
Group of inventions relates to oil and gas industry and is intended for well strainers in producing and injection horizontal wells. The device contains a hollow case inserted into a well strainer component and an end plate made of magnesium and connected to the case in an annular groove inside the case. The groove is made in the upper part of the case; it has an inner cavity with a snap ring installed in it; the latter fixes the end plate inside the case rigidly. At the opposite side of the case there is an inner cylindrical cavity with mesh filter element with cells installed in it and fixed rigidly by a hollow sleeve. In the basic element an opening is made with the inner thrust, thread is cut inside the opening, the case blank is prepared, its length is measured and cut off, external screw thread is made and the annular groove and the inner cylindrical cavity are made inside the case; then the inner cavity is made inside the annular groove, the end plate is installed and fixed. The hollow case is overturned and the mesh filtering element is inserted into the inner cylindrical cavity, fixed by the hollow sleeve; then the hollow case is crewed into an opening at the basic element with end plate to outside until tight.
 Well filter / 2509206
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.
 Borehole aperture filter / 2507384
Aperture 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 / 2504644
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.
 Downhole split filter / 2504643
Proposed 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 / 2499130
Device 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 / 2495997
Device 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 / 2492314
Device 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 / 2492313
Device 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 / 2490433
Device 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.
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FIELD: oil and gas industry. SUBSTANCE: device consists of a support tube with a number of longitudinal cuts, draining and filtering metal meshes. The meshes are corrugated longitudinally and placed with a gap in-between which is filled with granular filling. Perimeter of the filtering mesh in cross section is equal to perimeter of the well borehole. EFFECT: improving reliability, fineness of filtering and service life of the screen. 2 dwg
The invention relates to oilfield equipment, namely borehole extending filter (SRF), used in the completion of wells with open hole to prevent removal of rock particles from the layer. Known downhole filter, consisting of a supporting perforated pipe, inner and outer concentric slotted gratings formed from longitudinal prismatic cores and wound prismatic profile, and gravel packing between the slotted lattices (see, for example, the filter Dual Pre-Pack™, www.allovscreenworks.com or filter Muni-Pak™, www.ionhsonscreens.com). The disadvantage of the downhole filter is annular gap relative to the borehole wall, which accounts for the high speed fluid from the reservoir and its increased ability to transport particles of rock. Known SRF, comprising a perforated body, a cylindrical casing with vertical slits and filter blades, one longitudinal edge of which is fixed on the housing, and the second made with the possibility of extension through the slot beyond the casing to the junction of the blades to the borehole wall (Patent RF №2289680, EV 43/08, 2006). The drawback of the SRF is limited Flexural rigidity of its filter blade and the possibility of squeezing the reservoir pressure from the borehole wall that p is iveget to migration of rock particles through the open gaps. Known SRF containing the carrier pipe with slots and filter sheets of metal mesh having the shape of an iris chart, which is mounted on the carrier pipe with an overlap in the axial and circumferential directions (Patent RF №2197600, EV 43/08, 1998). A disadvantage of the known SRF is that when expansion is done by increasing the diameter of the carrier pipe, sheet metal grid move and RUB against each other, which may lead to disturbance of the structural integrity of the grid and the deterioration of the filtration properties of the SRF. Known SRF comprising a perforated body, a torsional spring and a longitudinally corrugated metal mesh as drainage and filtration membranes made with the possibility of increasing size in the promotion springs (Patent RF №2244103, E21B 43/08, 2005). The disadvantage of the SRF is loose, leaving gaps overlap filter membrane of the wellbore due to the limited stiffness of the torsion spring and, as a consequence, the early migration of rock particles in the remaining gaps, initiating the destruction of the reservoir. In addition, the SRF has a low filtration abilities due to a minor contaminant capacity of the drainage and filtration membranes. Known SRF containing longitudinally corrugated carrier pipe with holes, ribs Sarug the carrier pipe, filtering longitudinally corrugated pipe with slots and pellet the gasket between the pipe (Patent RF №2408778, E21B 43/08, 2011). The disadvantage of the SRF is uneven securemote and limited contaminant capacity pellet gaskets, since the liquid with particles of rock from the bottom-hole formation zone and gets cleared predominantly in local volumes gaskets under the slots of the filter tubes. The main volume of pellet gaskets are excluded from the filtering process, since the shielded impervious areas of the filter pipe. Closest to the claimed is the SRF, including supporting tube with a plurality of longitudinal slots, closely placed on the support tube and between a drain and filter, metal mesh, wire warp and weft which are located at an angle to the longitudinal axis (US Patent No. 6607032, E21B 43/08, 2003). The disadvantage adopted for the prototype SRF is the probability of violating the structural homogeneity and filtering capacity metal mesh with the expansion carried out by pulling the cone through the support pipe. In addition, the SRF has limited the filtration area and the increased pressure drop due to the necessity of applying the fine filter mesh to perform proper function. The present invention is higher is their subtlety cleaning, reliability and resource the work of the SRF. This technical result is achieved in that in a borehole extending the filter containing the supporting tube with the plurality of longitudinal slots and placed on the drain and filter metal grid, according to the invention the above grid is made longitudinally corrugated and placed with a gap between them that is filled with granular packing, while the cross section of the perimeter of the filter mesh is equal to the perimeter of the wellbore. Figure 1 shows a cross-section of the SRF during the descent into the well; figure 2 - is the same, but after the expansion in the well. The SRF includes a support pipe 1 with a plurality of longitudinal slots 2, which is equipped with drainage and filtration longitudinally corrugated metal grid 3 and 4. Cross-sectional perimeter of the filter mesh 4 is equal to the perimeter of the wellbore 8. Between the above-mentioned grids 3 and 4 there is a gap 5 is filled with granular gasket 6 (figure 1). The diameter of the pellets 6 and the cell size of the filter mesh 4 are determined taking into account the deduction of rock particles carried from the reservoir, and the cell size of the drainage grid 3 is assigned to hold the pellets 6 and increasing the flow of liquid from the pellet gaskets 6 to longitudinal slits 2. The size of the gap 5 is adjusted for the size of the subject to detention of rock particles, as well as for the devices small gradient of hydraulic resistance. SRF lower productive interval uncased borehole annular gap 7 relative to the borehole wall 8 (Fig 1). Through the support pipe 1 stretch expansion cone (not shown) that has a larger diameter opening in the circumferential direction of the longitudinal slots 2 and thereby increasing its outer size (figure 2). When extending support pipe 1 puts pressure on the contacting longitudinal corrugations drain metal mesh 3 and gradually straightens them. They, in turn, transmit this impact on the longitudinal corrugations of the filter metal grid 4 through pellets 6, which, being loose material, adapted to change the shape of both grids without the formation of voids. Corrugated metal grid 3, 4 when the smoothing accept a cylindrical shape, with a cylindrical filter mesh 4 is pressed tightly and overlaps the wall 8 of the productive interval of the formation wells. This predetermined maximum increase and decrease the speed of the reservoir fluid with a decrease in its ability to transport particulate material from the reservoir. When you enable electrical submersible pump (not shown) the liquid flows from prefiltrov the zone of the reservoir 9 in the entire cylindrical filter mesh 4 (figure 2). Due to this increased inflow and odnovremenno decreases the speed of the reservoir fluid and its ability to transport particles of rock. The absence of the annular gap 7 eliminates the vertical component of the velocity of fluid flow. The liquid passes through the filter cell of the grid 4, and in her coarse particle species are trapped on the outside of cells, forming a permeable structure. The liquid with the remaining smaller particles flows through the gap 5 is filled with granular gasket 6, and the cleanup continues in its microllam space. Thanks to the small pore size, high permeability and filtration area of pellet stuffing significantly improved cleaning of the reservoir fluid, and due to its low susceptibility to clogging and high contaminant capacity increases resource the work of the SRF. The treated produced fluid passes through the cells of the drainage grid 3 and the extended longitudinal slot 2 in the supporting tube 1, and then leaves the SRF and ultimately finds himself on the receiving electric centrifugal pump. Pumping the purified liquid reduces wear and increases the life of the pump. Due to the fact that the expansion of the claimed SRF accompanied by a change in only the geometric configuration of the drainage and filtration longitudinally corrugated metal mesh without affecting the structure and size of the grid, and without causing the formation of voids in the loose pellet stuffing, SRF is characterized by high the reliability and stability of performance, including filtration and hydraulic. Well expanding the filter containing the supporting tube with the plurality of longitudinal slots and placed on the drain and filter metal grid, characterized in that the above grid is made longitudinally corrugated and placed with a gap between them that is filled with granular packing, while the cross section of the perimeter of the filter metal grid is equal to the perimeter of the wellbore.
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