Layered pulse pressure-charging plug removal device and method for oil filed water injection well

Abstract

The invention discloses a layered pulse pressure-charging plug removal device and method for an oil filed water injection well. The device is arranged onto a water injection main line, a high-pressure water injection pipeline and the water injection well. The device comprises pressure-charging boxes, a low-pressure water injection pipeline and a high-pressure water injection pipeline, wherein the pressure-charging boxes are respectively provided with a high-pressure chamber and a low-pressure chamber; a piston is arranged between the corresponding high-pressure chamber and the corresponding low-pressure chamber, and the high-pressure chamber and the low-pressure chamber are communicated with the water injection main line respectively through a first water inlet pipeline and a second water inlet pipeline; the high-pressure chambers are communicated with the high-pressure water injection pipeline through a high-pressure pipeline, and are communicated with the water injection well; the first end of the low-pressure water injection pipeline is communicated with the low-pressure chambers; the second end of the low-pressure water injection pipeline is connected with a sleeve valve of the water injection well; the high-pressure water injection pipeline, the first water inlet pipeline, the second water inlet pipeline, the high-pressure pipeline and the low-pressure water injection pipeline are respectively provided with a first retaining valve, a second retaining valve, a third retaining valve, a fourth retaining valve and a fifth retaining valve in sequence; and a pressure gage is arranged between the first retaining valve and an oil pipe valve. Pressure-charging plug removal treatment can be independently performed on a low water intake layer in the water injection well so as to improve a water injection profile.

Description

technical field [0001] The present invention relates to a technique of pulse pressurization and blockage removal for small layers of oilfield water injection wells, in particular to a technique for boosting and blockage removal of low water absorption layers in individual water injection wells to improve the stratification of oilfield water injection wells with water absorption profiles Pulse pressurization and blocking removal device and method thereof. Background technique [0002] The non-absorbent thickness of Block Jin 16 in Jinzhou Oil Production Plant of Liaohe Oilfield accounted for 30.4% of the perforated section in 2003, and rose to 53.6% in 2009. The non-absorbent thickness of Block Jin 99 accounted for 34.1% in 2003, and rose to 54.3% in 2009. In order to increase the thickness of the water-absorbing layer, it is necessary to increase the water absorption of the low-permeability layer. Three methods can be adopted: plugging the high-permeability layer (water inje...

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Problems solved by technology

[0004] Existing technology 1: Automatic booster pump for oil field water injection, application number is 01140026.9, this technology introduces a booster pump for water injection wells, because it needs a low-pressure water injection network as an auxiliary, its implementation will inject a large amount of low-pressure water into the low-pressure well required water, causing turmoil in the water injection system, making it difficult to achieve

[0005] Existing technology 2: a pressure regulating water injection pump, the application number is 96249259.0, the principle and disadvantages are basically the same as the above patents, and it is difficult to implement

[0006] Prior art 3: Oilfield water injection pressurized water wheel pump, application number 96228470.X; prior art 4: in-well pressurized water injection method and its device, application number 89100282.0; prior art 5: pressure pulse oil well water injection device , the application number is 200610005334.3; prior art 6: supercharged water injection device, the application number is 201010114436.5; the above prior art 3-6, all need to add a power device to realize the injection well injection, the process is complicated and the cost is high

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