Well screen

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.



 

Same patents:

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