Sand filtering device for petroleum well bottom

Abstract

The utility model discloses a sand filtering device for a petroleum well bottom, and belongs to the technical field of sand filtering equipment for the petroleum well bottom. Comprising a sand filter cylinder and a petroleum well body, a packer is annularly arranged at the top end of the interior of the petroleum well body, the sand filter cylinder is inserted into the top end of the packer, a carrying ring is arranged at the top end of the sand filter cylinder, the carrying ring is an annular protrusion and is carried above the packer, one side of the carrying ring is connected with a blocking cover through a cover opening assembly, and the blocking cover is fixedly connected with the petroleum well body. A cleaning assembly is arranged in the sand filtering cylinder, the cleaning assembly is arranged, a limiting nut is lifted, so that a vertical rod horizontally slides up and down in a supporting plate, brush strips on the vertical rod are driven to act on inner screen holes in the sand filtering cylinder, particles blocked on the inner screen holes are pushed outwards, and a certain cleaning effect is achieved; and rapid flowing filtration of liquid can be kept.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well bottom sand filtering equipment, in particular to a oil well bottom sand filtering device. Background Art

[0002] Sand control refers to the correct selection of cementing and completion methods, formulation of reasonable production measures, control of production pressure difference, and limitation of seepage velocity to prevent sand blockage according to the oil layer and oil well conditions during the oil production process.

[0003] In the related art, in order to solve the problems of low filtering accuracy, easy breaking of binding wires, and falling off of metal wool filter plugs in the sand filter tube, the patent with prior art publication number CN201510649404.8 provides an oil well sand filter device, including a tube body, an oil inlet device, an oil collecting device, a diverter device, a holding device, a first filter device, a second filter device and a third filter device, the oil inlet device includes an oil inlet hopper and a first filter screen, the oil collecting device includes a first inclined plate, a first triangular block, a second filter screen and a first horizontal plate, the diverter device includes a main body, a third filter screen, a second horizontal plate, a first support rod, a magnet, a fourth filter screen, a sponge block, a first fixing frame and a second fixing frame.

[0004] Although the above-mentioned prior art solution is convenient for grabbing and replacing the device by setting a holding device, the operation is simple and quick, and the oil is diverted and filtered at the same time, thereby improving the filtration efficiency and effect, the existing oil well bottom sand filter device will intercept sand and gravel through the sand filter during the oil well oil production process. However, the internal filter holes of the existing sand filter are easily clogged during long-term filtration, resulting in a decrease in the filtration flow rate. In addition, the top of the sand filter has low safety and lacks certain protection, so foreign objects are easily dropped in and pollute oil resources.

[0005] In view of this, we propose a sand filtering device for oil well bottom. Utility Model Content

[0006] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a sand filtering device for the bottom of an oil well, which solves the problem that the filter holes inside the existing sand filter are easily clogged during long-term filtration, resulting in a reduction in the filtration flow rate. In addition, the top of the sand filter has low safety and lacks certain protection, which makes it easy for foreign objects to fall in and pollute oil resources. The utility model achieves the technical effects of top protection of the sand filter and internal cleaning and anti-clogging.

[0007] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a sand filtering device for the bottom of an oil well, comprising a sand filter cylinder and an oil well body, a packer is provided in an annular shape at the top end of the inside of the oil well body, a sand filter cylinder is inserted into the top end of the packer, a carrying ring is provided at the top end of the sand filter cylinder, the carrying ring is an annular protrusion carried above the packer, one side of the carrying ring is connected to a baffle via a cover opening assembly, and a cleaning assembly is provided inside the sand filter cylinder.

[0008] Preferably, inner sieve holes are equidistantly provided on the surface of the sand filter cylinder, and a wire-wrapped sieve tube is provided between two layers of the inner sieve holes.

[0009] Preferably, the cross-section of the wire-wrapped screen tube is in a trapezoidal shape that is wide outside and narrow inside.

[0010] Preferably, support plates are symmetrically arranged along the inner wall of the upper inner portion of the sand filter cylinder, vertical rods are slidably arranged inside the two support plates, a cleaning ring is arranged at the bottom end of the vertical rod, and brush strips are evenly arranged on the annular surface of the cleaning ring.

[0011] Preferably, the brush strip is made of rubber material, and the diameter of the cleaning ring is smaller than the diameter of the bottom surface of the sand filter cylinder.

[0012] Preferably, a limit nut is provided on the top thread of the vertical rod, and a limit screw is provided on the front side of the support plate for limiting position.

[0013] Preferably, the cover opening assembly includes a second gear member, a rotating shaft is disposed transversely inside the second gear member, rotating plates are connected to both sides of the rotating shaft, and one side of the two rotating plates is connected to the side surface of the blocking cover.

[0014] Preferably, a fixing member is connected to one side of the rotating shaft, a driving motor is provided on one side of the gear member 2, a driving shaft of the driving motor is provided with a gear member 1, and the upper part of the gear member 1 is meshedly connected with the gear member 2.

[0015] The utility model has the following technical effects:

[0016] (1) The present application is provided with a cleaning assembly, and by pulling the limit nut, the vertical rod is allowed to slide horizontally up and down in the support plate, driving the brush bar on the vertical rod to act on the inner sieve hole inside the sand filter cylinder, so that the particles blocked on the inner sieve hole are pushed outward, which has a certain cleaning effect and can maintain rapid flow and filtration of the liquid.

[0017] (2) The present application is provided with a cover opening assembly. After the driving motor is started, it drives the gear part to rotate, and the gear part drives the gear part to rotate, so that the rotating plate drives the blocking cover to rotate and open and close. It is opened when working and closed when not working, thereby increasing safety and preventing foreign objects from falling into the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the first three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the front view sand filter demonstration structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the utility model in the unfolded state;

[0021] Figure 4 For the utility model Figure 1 A schematic diagram of the enlarged local structure at point A in the middle;

[0022] Explanation of reference numerals in the figure: 110, sand filter cartridge; 111, inner sieve hole; 112, wire-wound screen tube; 120, baffle cover; 130, carrying ring; 140, packer; 150, oil well body; 200, cleaning assembly; 210, support plate; 211, limit nut; 212, limit screw; 213, vertical rod; 214, cleaning ring; 300, cover opening assembly; 310, rotating plate; 311, driving motor; 312, gear component one; 313, fixing component; 314, gear component two. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 To Attachment Figure 4 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0024] Embodiment 1

[0025] See also Figure 1-Figure 4 The utility model provides an embodiment: a sand filtering device for the bottom of an oil well, comprising a sand filtering cartridge 110 and an oil well body 150, wherein a packer 140 is provided in an annular manner at the top of the inside of the oil well body 150, and the sand filtering cartridge 110 is inserted into the top of the packer 140, and a carrying ring 130 is provided at the top of the sand filtering cartridge 110, wherein the carrying ring 130 is an annular protrusion carried on the top of the packer 140, and a baffle 120 is connected to one side of the carrying ring 130 through a cover opening assembly 300, and a cleaning assembly 200 is provided inside the sand filtering cartridge 110.

[0026] Furthermore, the surface of the sand filter cylinder 110 is provided with inner sieve holes 111 at equal intervals, and a wire screen tube 112 is provided between the two layers of inner sieve holes 111. The cross section of the wire screen tube 112 is trapezoidal in shape, which is wide outside and narrow inside. The petroleum liquid is intercepted and filtered by multiple wire screen tubes 112, and large sand and gravel are intercepted outside. The design of wide outside and narrow inside accelerates the flow speed of the petroleum liquid from outside to inside, and then passes through the inner sieve holes 111 for secondary filtration to enter the inside. The inner sieve holes 111 mainly filter fine sand and gravel. Support plates 210 are symmetrically provided along the inner wall of the upper part of the sand filter cylinder 110, and vertical rods 213 are slidably provided inside the two support plates 210. A cleaning ring 214 is provided at the bottom end of the vertical rod 213. Brush strips are evenly provided on the annular surface of the cleaning ring 214. The brush strips are made of rubber material, and the diameter of the cleaning ring 214 is smaller than the bottom diameter of the sand filter cylinder 110. Used in conjunction with the cleaning ring 214, by lifting the limit nut 211, the vertical rod 213 can slide horizontally up and down in the support plate 210, driving the brush strip on the vertical rod 213 to act on the inner sieve hole 111 inside the sand filter cylinder 110, so that the particles blocked on the inner sieve hole 111 are pushed outward, which has a certain cleaning effect and can maintain rapid flow and filtration of the liquid.

[0027] Furthermore, the top thread of the vertical rod 213 is provided with a limit nut 211, and the front of the support plate 210 is provided with a limit screw 212 for limiting. The cleaning ring 214 can be fixed at any position by the limit screw 212, and can be adjusted to be fixed upward during the filtering process to avoid mixing with the oil.

[0028] Embodiment 2

[0029] The utility model provides a sand filter device for oil well bottom, compared with the first embodiment, please refer to Figure 1-Figure 4 The cover opening assembly 300 includes a gear part 2 314, a rotating shaft is disposed inside the gear part 2 314, rotating plates 310 are connected to both sides of the rotating shaft, one side of the two rotating plates 310 is connected to the side of the blocking cover 120, one side of the rotating shaft is connected to a fixing member 313, a driving motor 311 is disposed on one side of the gear part 2 314, a driving shaft of the driving motor 311 is disposed with a gear part 1 312, and the upper part of the gear part 1 312 is meshed and connected with the fixing member 313. The driving motor 311 is connected to an external power source, and after starting, it drives the gear part 1 312 to rotate, and the gear part 1 312 drives the gear part 1 312 to rotate, so that the rotating plate 310 drives the blocking cover 120 to rotate and open and close, and it is opened when working, and closed when not working, so as to increase safety and prevent foreign objects from falling into the well.

[0030] In summary, when the sand filter device for the bottom of an oil well disclosed in the embodiment of the present application is used, the oil liquid is intercepted and filtered through a plurality of wire-wound screen tubes 112, and large sand and gravel are intercepted on the outside. The design of wide outside and narrow inside accelerates the flow speed of the oil liquid from the outside to the inside, and then passes through the inner sieve hole 111 for secondary filtration to enter the inside. The inner sieve hole 111 mainly filters fine sand and gravel. When used in conjunction with the cleaning ring 214, by lifting the limit nut 211, the vertical rod 213 slides horizontally up and down in the support plate 210, driving the brush bar on the vertical rod 213 to act on the inner sieve hole 111 inside the sand filter cylinder 110, so that the particles blocked on the inner sieve hole 111 are pushed outward, which has a certain cleaning effect and can maintain rapid flow and filtration of the liquid. The driving motor 311 is connected to an external power source. After starting, it drives the gear part 312 to rotate, and the gear part 312 drives the gear part 312 to rotate, so that the rotating plate 310 drives the blocking cover 120 to rotate and open and close. It is opened when working and closed when not working, which increases safety and prevents foreign objects from falling into the well.

[0031] The standard parts used in the utility model can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand filter device for oil well bottom, characterized by: The invention comprises a sand filter cartridge (110) and an oil well body (150), wherein a packer (140) is provided in an annular shape at the top of the oil well body (150), a sand filter cartridge (110) is inserted into the top of the packer (140), a carrying ring (130) is provided at the top of the sand filter cartridge (110), the carrying ring (130) is an annular protrusion carried on the top of the packer (140), one side of the carrying ring (130) is connected to a blocking cover (120) via a cover opening assembly (300), and a cleaning assembly (200) is provided inside the sand filter cartridge (110).

2. The sand filtering device for oil well bottom according to claim 1, characterized in that: The surface of the sand filter cylinder (110) is provided with inner sieve holes (111) at equal intervals, and a wire-wound screen tube (112) is provided between two layers of the inner sieve holes (111).

3. The sand filtering device for oil well bottom according to claim 2 is characterized in that: The cross section of the wire-wound screen tube (112) is in the shape of a trapezoid that is wide on the outside and narrow on the inside.

4. The sand filtering device for oil well bottom according to claim 1, characterized in that: Support plates (210) are symmetrically arranged along the inner wall of the upper part of the sand filter cylinder (110), vertical rods (213) are slidably arranged inside the two support plates (210), cleaning rings (214) are arranged at the bottom ends of the vertical rods (213), and brush strips are evenly arranged on the annular surface of the cleaning ring (214).

5. The sand filtering device for oil well bottom according to claim 4 is characterized in that: The brush strip is made of rubber material, and the diameter of the cleaning ring (214) is smaller than the bottom diameter of the sand filter cylinder (110).

6. The sand filtering device for oil well bottom according to claim 4, characterized in that: A limit nut (211) is provided on the top thread of the vertical rod (213), and a limit screw rod (212) is provided on the front surface of the support plate (210) for limiting position.

7. The sand filtering device for oil well bottom according to claim 1, characterized in that: The cover opening assembly (300) comprises a second gear member (314), a rotating shaft is disposed transversely inside the second gear member (314), rotating plates (310) are connected to both sides of the rotating shaft, and one side of the two rotating plates (310) is connected to the side surface of the blocking cover (120).

8. The sand filtering device for oil well bottom according to claim 7, characterized in that: A fixing member (313) is connected to one side of the rotating shaft, a driving motor (311) is provided on one side of the gear member 2 (314), a driving shaft of the driving motor (311) is provided with a gear member 1 (312), and the upper portion of the gear member 1 (312) is meshedly connected with the gear member 2 (314).

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