Foam hybrid cutter

Abstract

The application discloses a foam mixing cutter, which comprises a foam generating mechanism and a foam mixing cutting forming mechanism, wherein the foam generating mechanism is a four-way pipe structure with four pipe orifices, and the four pipe orifices are respectively a liquid inlet, a gas inlet, a foam raw liquid inlet and a primary foam liquid outlet; the liquid inlet is connected with a well washing liquid supply device, the gas inlet is connected with a gas supply device, and the foam raw liquid inlet is connected with a foam raw liquid supply device; the inlet of the foam mixing cutting forming mechanism is communicated with the primary foam liquid outlet, and the inside of the foam mixing cutting forming mechanism is sequentially provided with a first mixing area, a second cutting area and a final foam liquid outlet which are communicated with each other; the first mixing area is provided with guide vanes for multiple times of gas-liquid diversion and fusion; the upper part of the second cutting area is fixed with upper shearing blades, and the lower part of the second cutting area is fixed with lower shearing blades, and the upper shearing blades and the lower shearing blades are arranged in an upper and lower staggered mode. The application can improve the stability of the foam liquid, reduce the broken foam rate and prevent gas slip.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield development, more particularly to a foam mixing cutter. BACKGROUND

[0002] With the continuous change of oilfield development situation, foam liquid is more widely used in oilfields, such as foam sand washing, foam profile control, foam acidizing, foam mixing and other technologies are applied in major oilfields. Oil well development mode is continuously developing, and foam application is constantly breaking the application well depth record. The vertical depth of oil well has developed from 500-1000 meters to 4000 meters; the horizontal section has developed from 200 meters to 2000 meters.

[0003] With the application of new technologies, new equipment and new development methods in oilfield development, higher requirements and standards are put forward for foam liquid. The continuous increase of vertical depth of oil well and the length of horizontal section makes coiled tubing become a new main operation tool. However, the length of coiled tubing is 6000 meters, which leads to the gas slip of gas-liquid separation gas during operation, which becomes the main operation contradiction and seriously affects the operation effect.

[0004] Therefore, higher requirements are put forward for foam liquid for ultra-deep and ultra-long horizontal section wells, and it is imperative to improve the foaming effect and foam stability. SUMMARY

[0005] Therefore, the present application provides a foam mixing cutter, and the specific technical scheme is as follows:

[0006] A foam mixing cutter, comprising:

[0007] A foam generating mechanism, which is a four-way pipe structure with four pipe openings, the four pipe openings being a liquid inlet, a gas inlet, a foam stock solution inlet and a primary foam liquid outlet; the liquid inlet is connected to a well flushing liquid supply device, and a liquid control valve is arranged on the corresponding pipeline where the liquid inlet is located; the gas inlet is connected to a gas supply device, and a gas control valve is arranged on the corresponding pipeline where the gas inlet is located; the foam stock solution inlet is connected to a foam stock solution supply device, and a stock solution control valve is arranged on the corresponding pipeline where the foam stock solution inlet is located;

[0008] A foam mixing cutter forming mechanism, the inlet of the foam mixing cutter forming mechanism being in communication with the primary foam liquid outlet, and the inside of the foam mixing cutter forming mechanism being sequentially provided with a first mixing zone, a second cutting zone and a final foam liquid outlet in communication along the flow direction of the foam liquid; the first mixing zone is provided with guide vanes for multiple turning and fusion of gas and liquid; the second cutting zone is fixed with an upper shear blade at the upper part and a lower shear blade at the lower part, and the upper shear blade and the lower shear blade are arranged in an upper and lower staggered manner.

[0009] The main purpose of the foam mixing cutter is to improve the stability of the foam liquid, reduce the broken bubble rate and prevent gas slip.

[0010] The well washing liquid, gas and foam stock solution generate foam through initial mixing and collision in the four-way pipe structure, the foam enters the foam mixing cutting forming mechanism through the primary foam liquid outlet, and is more fully turned and stirred through the guide vanes in the primary mixing area, so that the stable foam liquid is formed and the gas slip is prevented; after sufficient mixing and stirring, the foam liquid passes through the secondary cutting area to form foam liquid with smaller diameter, which increases the stability and viscosity of the foam liquid, so that the foam liquid with smaller and more stable diameter flows out of the final foam liquid outlet, and the uniform and stable foam liquid which is not easy to break is formed.

[0011] Preferably, the four-way pipe structure is a high-pressure four-way.

[0012] Preferably, the gas supplied by the gas supply device is nitrogen, carbon dioxide or air.

[0013] Preferably, the guide vanes are in the shape of a foldback or a spiral.

[0014] Preferably, the bottom blade tip of the upper shear blade and the top blade tip of the lower shear blade are interpenetrated.

[0015] Preferably, the foam mixing cutter is made of high-pressure alloy material as a whole.

[0016] Preferably, the foam stock solution supply device includes a foam stock solution storage tank, a raw material filling pump and a frequency regulator, the inlet of the raw material filling pump is connected to the foam stock solution storage tank, the outlet is connected to the foam stock solution inlet, and the raw material filling pump is electrically connected to the frequency regulator capable of adjusting the outlet pressure.

[0017] Preferably, the raw material filling pump is a high-pressure plunger pump. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the foam mixing cutter.

[0020] Figure 2 It is a schematic diagram of the structure of the guide vane in spiral shape.

[0021] Figure 3 This is a schematic diagram of the secondary cutting zone.

[0022] In the diagram: 1-Liquid inlet, 2-Air inlet, 3-Foam concentrate inlet, 4-Primary foam concentrate outlet, 5-Liquid control valve, 6-Gas control valve, 7-Concentrate control valve, 8-Foam concentrate storage tank, 9-Raw material filling pump, 10-Variable frequency controller, 11-Primary mixing zone, 12-Secondary cutting zone, 13-Guide vane, 14-Upper shear blade, 15-Lower shear blade, 16-Final foam concentrate outlet. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Example:

[0026] like Figure 1 As shown, the present invention provides a foam mixing cutter, which includes a foam generating mechanism and a foam mixing and cutting forming mechanism.

[0027] The foam generating mechanism is a four-way pipe structure with four ports: liquid inlet 1, air inlet 2, foam concentrate inlet 3, and primary foam concentrate outlet 4. To ensure the overall stability of the device, the four-way pipe structure is a high-pressure four-way.

[0028] Inlet 1 is connected to the well-washing fluid supply equipment, and a liquid control valve 5 is installed on the corresponding pipeline where inlet 1 is located. The well-washing fluid supply equipment is existing technology and will not be described in detail here.

[0029] The air inlet 2 is connected to a gas supply device, and a gas control valve 6 is installed on the corresponding pipeline where the air inlet 2 is located. The gas supply device is existing technology and will not be described in detail here. The gas supplied by the gas supply device is nitrogen, carbon dioxide, or air, etc.

[0030] The foam stock solution inlet 3 is connected with a foam stock solution supply device, and a stock solution control valve 7 is arranged on a corresponding pipeline where the foam stock solution inlet 3 is located.

[0031] The well flushing fluid, the gas and the foam stock solution generate the foam by initial mixing and collision in the four-way pipe structure.

[0032] Further, the foam stock solution supply device comprises a foam stock solution storage tank 8, a raw material filling pump 9 and a frequency regulator 10.

[0033] Preferably, the raw material filling pump 9 is a high-pressure plunger pump.

[0034] In the present application, the raw material filling pump 9 can realize different concentration filling requirements of the foam stock solution under different gas-liquid discharge capacities through the frequency regulator 10, can realize high-pressure accurate liquid distribution and ensure the stability of the foam solution.

[0035] The inlet of the foam mixing and cutting forming mechanism is communicated with the primary foam solution outlet 4, and the inside of the foam mixing and cutting forming mechanism is sequentially provided with a primary mixing area 11, a secondary cutting area 12 and a final foam solution outlet 16 in the flow direction of the foam solution.

[0036] The primary mixing area 11 is provided with a guide vane 13 for multiple turning and fusion of the gas and the liquid. Figure 1 The guide vane 13 is in a shape of a foldback (as shown in Figure 2 or a spiral shape (as shown in

[0037] The foam mixing and cutting device of the present application makes the foam stock solution, the well flushing fluid and the gas fully fused in the process of forward and reverse rotation turning through the guide vane 13 of the primary mixing area 11, effectively solves the problem that the gas is easy to slip off due to different gas and liquid flow rates, and the specific principle is that the guide vane 13 reduces the gas flow rate in the process of guiding the gas and the liquid to turn multiple times, so as to prevent the gas from slipping off due to the gas flow rate being greater than the liquid flow rate.

[0038] As shown in Figure 3 , the secondary cutting area 12 is fixed with an upper shear blade 14 at the upper portion and a lower shear blade 15 at the lower portion, and the upper shear blade 14 and the lower shear blade 15 are arranged in an up-and-down staggered manner.

[0039] The foam mixing and cutting device of the present application is provided with the upper shear blade 14 and the lower shear blade 15 in the secondary cutting area 12, and the bubble diameter of the foam solution is reduced through the shearing principle, so that more stable foam solution which is not easy to break and has higher viscosity is formed.

[0040] Further, the bottom cutting edge of the upper shear blade 14 and the top cutting edge of the lower shear blade 15 are interpenetrated, which can prevent gas and liquid from being separated and gas from slipping off, similar to the guide vane 13.

[0041] Further, the foam mixing cutter is made of high-pressure alloy material, which can meet different pressure construction conditions and can realize 105MPa high-pressure construction requirement.

[0042] The improved foam mixing cutter can meet construction requirements, and the gas does not slip off, the outlet foam liquid is stable, the viscosity is high, the sand carrying capacity is outstanding, and the construction application effect is obvious.

[0043] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A foam hybrid cutter characterized by, The application relates to a foam mixing and cutting device. The foam generating mechanism is a four-way pipe structure with four pipe orifices, i.e. a liquid inlet (1), a gas inlet (2), a foam stock solution inlet (3) and a primary foam solution outlet (4); the liquid inlet (1) is connected with a well flushing liquid supply device, and a liquid control valve (5) is arranged on the corresponding pipeline where the liquid inlet (1) is located; the gas inlet (2) is connected with a gas supply device, and a gas control valve (6) is arranged on the corresponding pipeline where the gas inlet (2) is located; the foam stock solution inlet (3) is connected with a foam stock solution supply device, and a stock solution control valve (7) is arranged on the corresponding pipeline where the foam stock solution inlet (3) is located; well flushing liquid, gas and foam stock solution are mixed and collided in the four-way pipe structure to generate foam; The foam mixing and cutting forming mechanism is communicated with the primary foam solution outlet (4), and the inside of the foam mixing and cutting forming mechanism is sequentially provided with a first mixing area (11), a second cutting area (12) and a final foam solution outlet (16) which are communicated in sequence along the flow direction of the foam solution; the first mixing area (11) is provided with guide vanes (13) for multiple times of gas-liquid diversion and fusion; the second cutting area (12) is fixedly provided with upper shear blades (14) at the upper portion and lower shear blades (15) at the lower portion, and the upper shear blades (14) and the lower shear blades (15) are arranged in an interlaced mode; the bottom blade tip of the upper shear blades (14) and the top blade tip of the lower shear blades (15) are interpenetrated.

2. A foam hybrid cutter according to claim 1, wherein, The four-way pipe structure is a high-pressure four-way pipe.

3. A foam hybrid cutter according to claim 1, wherein, The gas supplied by the gas supply device is nitrogen, carbon dioxide or air.

4. A foam hybrid cutter according to claim 1, wherein, The guide vanes (13) are in a meander shape or a spiral shape.

5. A foam hybrid cutter according to claim 1, wherein, The foam mixing and cutting device is made of high-pressure alloy materials.

6. A foam hybrid cutter according to any one of claims 1-5, wherein, The foam stock solution supply device comprises a foam stock solution storage tank (8) and a raw material filling pump (9), and a frequency regulator (10); the inlet of the raw material filling pump (9) is connected with the foam stock solution storage tank (8), the outlet is connected with the foam stock solution inlet (3), and the raw material filling pump (9) is electrically connected with the frequency regulator (10) which can adjust the outlet pressure.

7. A foam hybrid cutter according to claim 6, wherein, The raw material filling pump (9) is a high-pressure plunger pump.

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