Water injection filtering device for oilfield water injection well

Abstract

The invention discloses a water injection filtering device for an oil field water injection well. The device comprises a filter disc and a mixing box, wherein the mixing box is fixed below the filterdisc and is communicated with the interior of the filter disc, the filter disc is cylindrical, a disc cover is arranged at the top of the filter disc, a water inlet pipeline is inserted into the disccover, the water inlet pipeline is communicated with the interior of the filter disc, the interior of the filter disc is provided with a double-layer structure comprising an outer ring groove and an inner transfer cavity, the outer ring groove is located outside the inner transfer cavity, and an annular partition wall is arranged between the outer ring groove and the inner transfer cavity. According to the device, the filter disc with the inner-outer double-cavity structure is arranged, and the impurities in water are intercepted through a plurality of filter screen plates in the filter disc,so that the flowing path of water is increased under the condition that the occupied area is not increased so as to ensure the intercepting effect, and when one filter screen plate needs to be disassembled and maintained, normal filtering work can be conducted through the other filter screen plates so as to ensure the continuous water injection work and improve the production efficiency.

Description

technical field [0001] The invention relates to oil field water injection technology, in particular to a water injection filter device for oil field water injection wells. Background technique [0002] Water injection wells are wells used to inject water into oil layers. In the process of oil field development, water is injected into oil reservoirs through special water injection wells to maintain or restore oil layer pressure, so that the oil reservoirs have a strong driving force to improve the recovery of oil reservoirs. The speed and recovery factor, and the injection water usually needs to use the filter device to filter and remove impurities. [0003] With the continuous use of the water injection filter device of the water injection well, the traditional filter device cannot work continuously for a long time due to its unreasonable structural design, requires frequent maintenance and cleaning, and is difficult to disassemble, repair and clean, and cannot adapt to larg...

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Problems solved by technology

[0003] With the continuous use of the water injection filter device of the water injection well, the traditional filter device cannot work continuously for a long time due to its unreasonable structural design, requires frequent maintenance and cleaning, and is difficult to disassemble, repair and clean, and cannot adapt to large flow water injection filtration; therefore It is necessary to design a water injection filter device for oilfield water injection wells to address the above problems

[0004] Chinese Patent Announcement No. CN209519462U proposes a filter device for oilfield water injection through water injection. By setting the filter structure, it can effectively intercept aquatic plants, avoid the impact of filling equipment for aquatic plant water injection wells, effectively retain sand and gravel, and avoid sand and gravel. The pipes and equipment are blocked, but the problem of its design structure is that because the filter screen is single-layer, when the filter screen is blocked, it is necessary to stop water injection for maintenance, which directly affects the production efficiency, and the single-layer filtrate cannot Ensure the thoroughness of filtration

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