FIELD: oil-and-gas industry.
SUBSTANCE: proposed device comprises metal pipe with holes stopped by plug from below and by coupling from above and cylindrical filter element arranged there inside and aligned therewith. Pipe top section with holes is composed by a separate section with no inside filter element coated with screen on the outside. Said section houses rubber diaphragm composed by the sleeve. Diaphragm thickness decreases in vertical line parallel with metal pipe axis and aligned with elongated hole major axis. Proposed filter is composed of sections connected by couplings. Pipe top section with holes is connected with pump on one side or with shank by coupling and with downstream filter section on opposite side.
EFFECT: higher reliability, simplified design, increased MTBR.
3 cl, 5 dwg
The invention relates to the oil industry and can be used in the exploitation of oil, gas and water wells.
Known filter protivopotochny consisting of concentrically arranged outer, intermediate and inner tubes, the latter being provided with holes, as well as the subs. Thus the inner wall of the pipe is equipped with located inside of the filter mesh, made in the form of the screw and attached opposite performed along a helical line of holes. The inner and outer tubes in the upper part are connected tangential nozzles, and the inner and intermediate pipes in the lower part is also connected tangential nozzles, but oppositely oriented relative to the first. The annular gap between the intermediate and inner tubes in the upper part, and the upper and lower part of the inner pipes are fitted with plugs, the outer pipe in the upper part equipped with a flexible knees, and in the lower part of the stub (U.S. Pat. Of the Russian Federation No. 2158358, E21B 43/08, 1999).
The disadvantages of the design of this filter are abrasive wear and destruction of the filtration grid due to its blockage and slow cleaning from mechanical impurities, and low coefficient of separation of solids.
Known filter well, with the standing of a concentrically arranged outer the intermediate and inner tubes, the latter two with openings in the upper part are connected by the pipe, while the outer tube at both its ends connected to the intermediate pipe o-ring plugs (U.S. Pat. Of the Russian Federation No. 2305756, E21B 43/08, 2007).
The disadvantage of this filter is the complexity of its design, resulting in higher labor intensity during subsequent Assembly and operation. In case of clogging of the filter element, fluid flow is stopped, which causes the need for filter replacement and, as a consequence, the stopping operation of the pump.
Closest to the claimed invention is in the technical result and the problem at hand is well filter (U.S. Pat. Of the Russian Federation No. 2355876, E21B 43/08, 20.05.2009,) consisting of concentrically arranged inner and outer pipes. Thus, the outer metal pipe is provided with holes, the upper part is equipped with a clutch, which features a spring-loaded valve, and the lower part of the stub. Inside the metal tube is a filter element made in the form of sections of the inner pipe, the alignment of which provide centralizers.
However, this filter is not effective enough, because it has low reliability due to the complex design of the valve, increasing the cost of its production. The presence of a ball with a spring and requires the use of expensive corrosion-resistant materials, which could ensure trouble-free operation of the valve of the site throughout the period of operation of the downhole filter. In addition, the spring operating in the aggressive environment of the well fluid, is the weak link in the design of the filter, which reduces the turnaround time of pump operation.
The task, which is aimed by the invention, is to increase the efficiency of the downhole filter by reducing the labor required for its production due to provide technical result - simplify design and increase reliability, and increase the turnaround time of the pump is equipped with a filter. Increase time between pump operation occurs for a period equal to the period of its operation in the conditions of a clogged filter element, by allowing the passage of fluid through the upper section when the clogging of the filter element.
This task is solved in that the downhole filter comprising a metal pipe with holes supplied from the bottom cover and the top coupling, and placed inside a metal tube coaxial with her cylindrical filter element, characterized in that the upper part of the metal pipe with holes made in the form of separate sections that do not have inside the filter element, the outside cover is and mesh, and inside contains made in the form of a sleeve of rubber diaphragm, the thickness of which is reduced by the vertical line, parallel to the axis of the metal pipe and coincident with the major axis of the elongated holes made in the upper part of the metal pipe.
The filter is made in the form of the United couplings of the sections, the number of which is determined by the operating conditions. The upper part of the metal pipe with holes made in the form of separate sections that do not have inside the filter element, is connected on one side with a pump or shank coupling with male thread at the top and an internal thread at the bottom, and on the other hand - coupling with internal thread from below the filter section.
Diagram of the downhole filter shown in the figures.
Figure 1 - well Filter.
The dashed lines in the upper part of the metal pipe, made in the form of separate sections show the location of the holes elongated, lengthening performed along a single section of metal pipe.
Figure 2 - Top separate section of the downhole filter, with the clutch.
The dashed lines in the upper part of the coupling and at the top a separate section of the downhole filter indicate the presence of threading. The sleeve has an external thread at the top and an internal thread at the bottom.
Phi is .3 - A separate segment of the upper section of the downhole filter.
4 is a Rubber diaphragm before and after the gap.
5 is a Fragment of the cross section of the rubber diaphragm, the thickness of which is reduced by the vertical line, parallel to the axis of the metal pipe and coincident with the major axis of the elongated holes made in the upper part of the metal pipe (representing a separate upper section of the downhole filter).
The letter a in figure 1 shows a portion of a downhole filter, subsequently enlarged and shown in figure 2.
The letter B in figure 2 shows a portion of a separate upper section of the downhole filter, subsequently enlarged and shown in figure 3.
Letters C and D in figure 3 marked the opening cross-section in the upper part of the metal pipe and the portion of the diaphragm.
By the letter D in figure 4 shows a fragment of the cross section of the rubber diaphragm, the thickness of which is reduced by the vertical line, parallel to the axis of the metal pipe and coincident with the major axis of the elongated holes made in the upper part of the metal pipe, later enlarged and shown in figure 5.
The downhole filter contains a metal pipe 1 with 2 holes in its upper part, made in the form of separate sections, 2 holes elongated, lengthening performed along the meth is lechaschau pipe, the filter element 3, the coupling with internal threads 4, the cover 5. In the downstream part of the metal pipe 1, the shape of the holes is not principal.
On the outer surface of the upper separate section of the metal pipe 1, having the inside of the filter element, set the grid 6, and its inner surface is a rubber diaphragm 7, the thickness of which is reduced by the vertical line 9 parallel to the axis of the metal pipe 1 and coinciding with the major axis of the elongated holes 2 of the form.
Produced well fluid flows through the inner section 8 of the device on the pump intake. Coupler 10 having an external thread at the top and inner bottom, connects the upper part of the metal pipe 1 with a pump or shank.
The downhole filter is mounted under installed in the well on the tubing tube pump deep, or on the lower end of the shank.
The downhole filter works as follows.
Produced well fluid passing through the holes of the metal pipe 1 and through the surface of the filter element 3, is cleaned from particles and forth on the inner section 8 of the device gets to the pump intake. The number of sections of the filter is determined by the operating conditions. Clutch 4 provide the connection of the filter sections to each other, and the clutch 10, have th male thread at the top and inner bottom, connects the upper part of the metal pipe 1 with a pump or shank. The cover 5 prevents the passage of fluid through the open end of the filter element 3. As the clogging of the surface of the filter element 3, the pressure at the pump intake increases. Upon reaching the calculated values of the pressure drop occurs the destruction of the rubber diaphragm 7, the thickness of which is reduced by the vertical line 9 parallel to the axis of the metal pipe 1 and coinciding with the major axis of the elongated holes 2 forms made in the pipe 1. It is the decrease of the thickness of the rubber diaphragm 7 allows its destruction and the opening type doors, without separation of the pieces of fragments of rubber diaphragms 7 and clogging their pump valves or clearance piston of the pair; and the liquid enters the pump intake, bypassing the filter element 3, passing through the holes 2 and destroyed in line 9, the rubber diaphragm 7. Grid 6 protects the rubber diaphragm 7 from destruction in the process of the descent of the filter in the well and the pump intake from ingress of particles of large size.
The claimed invention can be used in oil, gas, mining and other industries when pumping from wells of various kinds of liquid media from mechanical impurities.
1. The downhole filter, vklyuchayuschimisya pipe with holes, equipped with bottom cover and the top coupling, and placed inside a metal tube coaxial with her cylindrical filter element, characterized in that the upper part of the metal pipe with holes made in the form of separate sections that do not have inside the filter element, outside covered with a net, and inside contains made in the form of a sleeve of rubber diaphragm, the thickness of which is reduced by the vertical line, parallel to the axis of the metal pipe and coincident with the major axis of the elongated holes made in the upper part of the metal pipe.
2. The filter according to claim 1, characterized in that it is made in the form of the United couplings of the sections, the number of which is determined by the operating conditions.
3. The filter according to claim 2, characterized in that the upper part of the metal pipe with holes made in the form of separate sections that do not have inside the filter element, is connected on one side with a pump or shank coupling with male thread at the top and an internal thread at the bottom, and on the other hand - coupling with internal thread from below the filter section.
FIELD: oil-and-gas industry.
SUBSTANCE: in drilling, seepage-volume characteristics of the bed and their alteration over borehole are defined, borehole is divided into zones that differ in said characteristics by 1.5-1.6 times to select filter performance separately for each zone and quantity of holes. Screen filter elements are fitted in filter holes under plugs. Flow string with filter equipped with water- or oil-swelling packers is lowered into well, said packers being set at boundaries of zones with different characteristics and string being fixed. Assembly is assembled at mouth and composed of the following elements arranged from bottom to top, i.e. cutter, locating bearing, screw downhole motor and stiff locator to be lowered against the stop to plugs. At cutting sheared plugs, flow string is displaced downward to remove sheared plugs and to withdraw the flow string. Flexible pipe sting is lowered to work face and displaced therefrom to mouth along with injection of plugging material to isolate holes made at filter bottom perimeter.
EFFECT: higher efficiency of extraction or injection, simplified mounting.
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.
FIELD: oil and gas industry.
SUBSTANCE: 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.
EFFECT: improving operational efficiency and service life of the strainer, simplifying its assembly.
2 cl, 2 dwg
SUBSTANCE: 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.
EFFECT: higher reliability of operation.
3 cl, 2 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: 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.
EFFECT: higher reliability, efficiency and wear resistance.
11 cl, 11 dwg
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.
FIELD: oil-and-gas industry.
SUBSTANCE: 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.
EFFECT: higher quality of filtration.
FIELD: oil-and-gas industry.
SUBSTANCE: 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.
EFFECT: simplified assembly, higher reliability.
FIELD: oil and gas industry.
SUBSTANCE: 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.
EFFECT: simplifying manufacturing technology, improving production efficiency.
11 cl, 3 dwg
SUBSTANCE: 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%.
EFFECT: increased duration of filter operation.
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.
FIELD: oil and gas extractive industry.
SUBSTANCE: 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.
EFFECT: higher product quality, stabilized well productiveness, increased well filter service duration.
2 cl, 4 dwg
FIELD: mining industry, particularly water, oil or gas well equipment.
SUBSTANCE: 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.
EFFECT: possibility of system operation optimization.
FIELD: mining industry, particularly filters for injection wells for underground leaching, bed flooding and burial of waste in deep horizons.
SUBSTANCE: 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.
EFFECT: possibility of system operation optimization.
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.
FIELD: oil production industry, particularly devices preventing ingress of formation sand and propane with extractable formation fluid from bottomhole formation zone into well.
SUBSTANCE: 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.
EFFECT: increased filtering performance.
FIELD: mining industry, particularly equipment for water intake, oil and gas wells arranged within the interval of production bed made up of soft rock.
SUBSTANCE: 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.
EFFECT: improved maintainability and increased efficiency of well repair.
3 cl, 1 dwg
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
FIELD: oil and gas wells, particularly to reduce longitudinal fluid flow through hole annuity.
SUBSTANCE: method 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.
EFFECT: increased efficiency.
6 cl, 4 dwg
FIELD: well drilling and completion.
SUBSTANCE: device 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.
EFFECT: reduced force for tube expansion from radially compressed state.
49 cl, 45 dwg