Preparation Device and Preparation Method of a Reinforced Foam Oil Displacement System

Abstract

The present invention provides a preparation device and a preparation method for an enhanced foam flooding system applied to the field of foam flooding technology. Through a front foaming end, a pre-foaming device, a rear foam stabilizing end, and a post-foaming device, a foam stabilizing plate group is connected to the output end of the post-foaming device; the foam stabilizing plate group is used for throat size adjustment. The foam stabilizing plate group includes a plurality of foam control plates. Each foam control plate includes a bottom plate, and a top plate is fixedly connected to the bottom plate. A plurality of uniformly distributed fixed columns and movable columns are arranged between the bottom plate and the top plate. Each movable column is equidistantly arranged between two adjacent fixed columns; a C-shaped frame is clamped on the outer side of the foam stabilizing plate group, and electromagnet bars matching the movable columns are installed at both the upper and lower ends of the C-shaped frame, which can achieve stable preparation of enhanced foam, improve the effect of foam flooding work through the enhanced foam, and the output control of the enhanced foam is convenient to control, facilitating to meet the requirements of foam flooding work under different working conditions.

Description

Technical Field

[0001] The present application relates to the technical field of foam flooding, and particularly relates to a preparation device for an enhanced foam flooding system and a preparation method thereof. Background Art

[0002] At present, most oil fields in China have entered the high water cut development stage, but the average oil recovery rate of the developed oil fields is very low, only about 30%. The key to improving the oil recovery rate after water flooding is mobility control. Foam is a dispersion system formed by a surfactant solution and gas, which can effectively control the mobility of the displacement medium, increase the swept volume, and thus improve the recovery rate. As an important tertiary oil recovery technology, foam flooding has great development potential in reducing the gas-oil ratio, increasing the crude oil production, and improving the sweep efficiency.

[0003] This article systematically studies and summarizes the technical status of the flow mechanism, mathematical model research, etc. of foam flooding, as well as the problems existing in the mechanism and field application of foam flooding at present. On this basis, relevant suggestions are put forward for the development direction of foam flooding, and it is considered that the numerical simulation technology of foam flooding, the development of new foaming agents, and the air foam system are of great significance to the future development and popularization of foam flooding technology. Summary of the Invention

[0004] The purpose of the present application is to provide a preparation device for stably outputting enhanced foam. Compared with the prior art, a preparation device for an enhanced foam flooding system is provided, including a pre-foaming end, a pre-foaming device, a post-foaming stabilizing end, and a post-foaming device. The pre-foaming end includes a foaming input end and a fluid source input end;

[0005] The foaming input end includes a first liquid storage tank with a first liquid pump, and a first mixer is installed at the output end of the first liquid storage tank;

[0006] The fluid source input end includes a liquid pump, a gas pump, and a flow rate regulating device. The flow rate regulating device includes a flow valve and a one-way solenoid valve. The output end of the fluid source input end is connected to the input end of the first mixer, and the output end of the first mixer is connected to the input end of the pre-foaming device;

[0007] The post-foaming stabilizing end includes a foam stabilizer input device and a foam stabilizer plate group; the foam stabilizer input device is connected to the output end of the pre-foaming device;

[0008] The foam stabilizer input device includes a second liquid storage tank with a second liquid pump, a second mixer is installed at the output end of the second liquid storage tank, and the output end of the second mixer is connected to the input end of the post-foaming device;

[0009] The foam stabilizing plate group is connected to the output end of the post-foaming device; the foam stabilizing plate group is used for adjusting the throat size, and the foam stabilizing plate group includes a plurality of foam regulating plates. Each foam regulating plate includes a bottom plate, on which a top plate is fixedly connected. Between the bottom plate and the top plate, a plurality of uniformly distributed fixed columns and movable columns are provided, and each movable column is equidistantly arranged between two adjacent fixed columns;

[0010] A C-shaped frame is clamped on the outside of the foam stabilizing plate group, and electromagnetic iron bars matching the movable columns are installed at both the upper and lower ends of the C-shaped frame.

[0011] This solution can achieve the stable preparation of enhanced foam, improve the effect of foam flooding by using the enhanced foam, and the output control of the enhanced foam is convenient to control, facilitating to meet the requirements of foam flooding under different working conditions.

[0012] Optionally, the foaming input end is used to output the foaming agent, and the foaming agent stored in the first liquid storage tank includes an anionic surfactant and a non-ionic surfactant.

[0013] Optionally, the foam stabilizer used by the foam stabilizer input device includes: polymer XG, hydrophobically associating polymer HAWP, and polymer KY.

[0014] Furthermore, the pre-foaming end, the pre-foaming device, the post-foam stabilizing end, and the post-foaming device are connected by heat-insulating pipes.

[0015] Furthermore, the output end of the post-foaming device includes a foaming net, on which multiple rows of uniformly distributed foaming holes are provided, and each row of the foaming net respectively matches the input end of a foam regulating plate.

[0016] Furthermore, the C-shaped frame includes a pair of fixed beams, and a hydraulic telescopic device is connected between the pair of fixed beams.

[0017] Furthermore, it includes a preparation device control system. The preparation device control system includes a processor. The pre-foaming end, the pre-foaming device, the post-foam stabilizing end, and the post-foaming device are all signal-connected to the processor, and a data processing module and a control module are installed in the processor.

[0018] Furthermore, a method for preparing enhanced foam is characterized in that the specific method includes:

[0019] S1, first output a gas-liquid mixture mixed with a foaming agent through the fluid source input end;

[0020] S2, then perform primary foaming through the pre-foaming device;

[0021] S3, during the process of transferring the fluid output after foaming to the post-foaming device, add a foam stabilizer and mix;

[0022] S4. Secondary foaming is carried out by the post-foaming device, and the output foam is output through the foam stabilizing plate group to form a uniform foam group.

[0023] Optionally, sliding grooves are provided at both the upper and lower ends of the movable column, positioning columns matching the sliding grooves are fixedly connected to both the bottom plate and the top plate, an electric guide rail is installed on the C-shaped frame, and the C-shaped frame slides relative to the foam stabilizing plate group. Before the foaming device in step S4 works: the C-shaped frame is driven to displace by the electric guide rail, and at this time, multiple movable columns in the foam stabilizing plate group are driven to move, so as to adjust the distance between the movable column and the fixed column. The distance between the movable column and the fixed column is adjustable, which is convenient for controlling the size of the bubbles output at the movable column.

[0024] Optionally, a receiving cavity matching the movable column is provided on the bottom plate, and a sealing ring matching the movable column is fixedly connected to the top plate. Before the foaming device in step S4 works: the electromagnet in the C-shaped frame is powered off, and at this time, multiple movable columns in the foam stabilizing plate group are received into the receiving cavity; the movable column can sink and be received, and at this time, the output bubbles are output with the maximum volume.

[0025] Compared with the prior art, the advantages of this application are as follows:

[0026] (1) This solution can stably prepare enhanced foam, improve the effect of foam flooding by the enhanced foam, and the output control of the enhanced foam is convenient to control, which is convenient to meet the requirements of foam flooding under different working conditions.

[0027] (2) The output end of the post-foaming device includes a foaming net, and multiple rows of uniformly distributed foaming holes are provided on the foaming net. Each row of the foaming net is respectively matched with the input end of a foam control plate, and the state of the enhanced foam output is regulated by the foam stabilizing plate group.

[0028] (3) Sliding grooves are provided at both the upper and lower ends of the movable column, positioning columns matching the sliding grooves are fixedly connected to both the bottom plate and the top plate, an electric guide rail is installed on the C-shaped frame, and the C-shaped frame slides relative to the foam stabilizing plate group. Before the foaming device in step S4 works: the C-shaped frame is driven to displace by the electric guide rail, and at this time, multiple movable columns in the foam stabilizing plate group are driven to move, so as to adjust the distance between the movable column and the fixed column. The distance between the movable column and the fixed column is adjustable, which is convenient for controlling the size of the bubbles output at the movable column.

[0029] (4) A receiving cavity matching the movable column is provided on the bottom plate, and a sealing ring matching the movable column is fixedly connected to the top plate. Before the foaming device in step S4 works: the electromagnet in the C-shaped frame is powered off, and at this time, multiple movable columns in the foam stabilizing plate group are received into the receiving cavity; the movable column can sink and be received, and at this time, the output bubbles are output with the maximum volume. Description of the Drawings

[0030] Figure 1Schematic structural diagram of the preparation device of the present application;

[0031] Figure 2 Flow chart of the preparation process of the enhanced foam of the present application

[0032] Figure 3 Flow chart of the preparation method of the present application

[0033] Figure 4 Stereogram of the foam stabilizing plate group of the present application;

[0034] Figure 5 Exploded view of the foam stabilizing plate group of the present application;

[0035] Figure 6 Schematic partial structural diagram at the fixing column when the foam stabilizing output plate of the present application is working;

[0036] Figure 7 Partial cross-sectional view at the movable column in Example 2 of the present application;

[0037] Figure 8 Partial cross-sectional view at the movable column in Example 3 of the present application;

[0038] Figure 9 Performance table of the foam obtained by using different foam stabilizers in the present application.

[0039] Explanation of the reference numerals in the figure:

[0040] 1 Foaming agent input device, 2 Gas source flow rate regulating device, 3 Foam stabilizing output plate, 301 Bottom plate, 302 Top plate, 4 Fixing column, 5 Movable column, 6 C-shaped frame. Detailed implementation manners

[0041] In the embodiments, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings of the specification. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0042] Example 1:

[0043] The present invention provides a preparation device for stably outputting enhanced foam. Please refer to Figure 1-2 , which includes a front foaming end, a pre-foaming device 1, a rear foam stabilizing end and a post-foaming device 2. The front foaming end includes a foaming input end and a fluid source input end;

[0044] The foaming input end includes a first liquid storage tank with a first liquid pump, and a first mixer is installed at the output end of the first liquid storage tank; the foaming input end is used to output a foaming agent, and the foaming agent stored in the first liquid storage tank includes an anionic surfactant and a non-ionic surfactant.

[0045] The fluid source input end includes a liquid pump, a gas pump and a flow regulating device. The flow regulating device includes a flow valve and a one-way solenoid valve. The output end of the fluid source input end is connected to the input end of the first mixer, and the output end of the first mixer is connected to the input end of the pre-foaming device 1;

[0046] The post-foam stabilizing end includes a foam stabilizer input device and a foam stabilizer plate group; the foam stabilizer input device is connected to the output end of the pre-foaming device 1; the foam stabilizers used by the foam stabilizer input device include: polymer XG, hydrophobically associating polymer HAWP and polymer KY.

[0047] The foam stabilizer input device includes a second storage liquid tank with a second liquid pump. The output end of the second storage liquid tank is equipped with a second mixer, and the output end of the second mixer is connected to the input end of the post-foaming device 2;

[0048] The pre-foaming end, the pre-foaming device 1, the post-foam stabilizing end and the post-foaming device 2 are connected by heat-insulating pipelines.

[0049] Please refer to Figure 4-6 , the foam stabilizer plate group is connected to the output end of the post-foaming device 2; the output end of the post-foaming device 2 includes a foaming net, and multiple rows of evenly distributed foaming holes are arranged on the foaming net. The foam stabilizer plate group is used for adjusting the throat size. The foam stabilizer plate group includes multiple foam control plates 3. Each row of the foaming net is respectively matched with the input end of a foam control plate 3; the foam control plate 3 includes a bottom plate 301, and a top plate 302 is fixedly connected to the bottom plate 301. Multiple evenly distributed fixed columns 4 and movable columns 5 are arranged between the bottom plate 301 and the top plate 302. Each movable column 5 is equidistantly arranged between two adjacent fixed columns 4;

[0050] A C-shaped frame 6 is clamped outside the foam stabilizer plate group. Electromagnetic iron bars matched with the movable columns 5 are installed at both the upper and lower ends of the C-shaped frame 6. The electromagnetic iron bars are used to attract the movable columns 5. The C-shaped frame 6 includes a pair of fixed beams, and a hydraulic telescopic device is connected between the pair of fixed beams.

[0051] Please refer to Figure 2 , including a preparation device control system. The preparation device control system includes a processor. The pre-foaming end, the pre-foaming device 1, the post-foam stabilizing end and the post-foaming device 2 are all signal-connected to the processor, and a data processing module and a control module are installed in the processor.

[0052] Please refer to Figure 3 , a method for preparing reinforced foam, characterized in that the specific method includes:

[0053] S1, first output a gas-liquid mixture mixed with a foaming agent through the fluid source input end;

[0054] S2, then perform primary foaming through the pre-foaming device 1 to obtain APG foam;

[0055] In S3, during the process of transferring the fluid output after foaming to the post-foaming device 2, a foam stabilizer is added and mixed;

[0056] In S4, secondary foaming is carried out through the post-foaming device 2, and the output foam is output through the foam stabilizer plate group to form a uniform foam group.

[0057] This solution can achieve the stable preparation of enhanced foam, improve the effect of foam flooding through the enhanced foam, and the output control of the enhanced foam is convenient to control, facilitating the meeting of the requirements of foam flooding under different working conditions.

[0058] Embodiment 2:

[0059] Please refer to Figure 7 and Figure 9 , where the same or corresponding components as in Embodiment 1 adopt the corresponding reference numerals of Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. The difference between this Embodiment 2 and Embodiment 1 is that:

[0060] A receiving cavity matching the movable column 5 is opened on the bottom plate 301, and a sealing ring matching the movable column 5 is fixedly connected to the top plate 302;

[0061] Before the foaming device in step S4 works: the electromagnet in the C-shaped frame 6 is powered off, and at this time, the multiple movable columns 5 in the foam stabilizer plate group are received into the receiving cavity; the movable column 5 can sink and be received, and at this time, the output bubbles are output with the maximum volume.

[0062] The movable column 5 in this embodiment is directly fast through lifting, and it can be selected whether to squeeze and split the foam when the foam is output, which is applicable to foams with general or strong liquid film structure strength and foam stability, such as the bubbles output using HAWP and KY as foam stabilizers.

[0063] Embodiment 3:

[0064] Please refer to Figure 8-9 , where the same or corresponding components as in Embodiment 1 adopt the corresponding reference numerals of Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. The difference between this Embodiment 2 and Embodiment 1 is that:

[0065] Chute grooves are opened at both the upper and lower ends of the movable column 5, positioning columns matching the chute grooves are fixedly connected to both the bottom plate 301 and the top plate 302, an electric guide rail is installed on the C-shaped frame 6, and the C-shaped frame 6 slides relative to the foam stabilizer plate group;

[0066] Before the foaming device in step S4 works: The C-shaped frame 6 is driven by an electric guide rail to move. At this time, multiple movable columns 5 in the foam stabilizing plate group are driven to move, thereby adjusting the distance between the movable column 5 and the fixed column 4. The distance between the movable column 5 and the fixed column 4 is adjustable, which is convenient for controlling the size of the bubbles output at the movable column 5.

[0067] In this embodiment, the relative distance between the movable column 5 and the fixed column 4 is adjustable, which is convenient for adjusting the width of the throat formed between the movable column 5 and the fixed column 4. The foam is extruded and split through the throat. When the foam is output, it is convenient to adjust the extrusion force by adjusting the throat width, which is applicable to foams with strong liquid film structure strength and foam stability, such as the bubbles output using the biological polymer XG as a foam stabilizer.

[0068] The above is only the best implementation mode adopted by the present application in combination with the current actual needs, but the protection scope of the present application is not limited thereto.

Claims

1. A preparation device for an enhanced foam flooding system, characterized in that, It includes a front foaming end, a pre-foaming device (1), a rear foam stabilizing end, and a post-foaming device (2). The front foaming end includes a foaming input end and a fluid source input end; The foaming input end includes a first liquid storage tank with a first liquid pump, and a first mixer is installed at the output end of the first liquid storage tank; The fluid source input end includes a liquid pump, a gas pump, and a flow regulating device. The flow regulating device includes a flow valve and a one-way solenoid valve. The output end of the fluid source input end is connected to the input end of the first mixer, and the output end of the first mixer is connected to the input end of the pre-foaming device (1); The rear foam stabilizing end includes a foam stabilizer input device and a foam stabilizing plate group; the foam stabilizer input device is connected to the output end of the pre-foaming device (1); The foam stabilizer input device includes a second liquid storage tank with a second liquid pump, and a second mixer is installed at the output end of the second liquid storage tank. The output end of the second mixer is connected to the input end of the post-foaming device (2); The foam stabilizing plate group is connected to the output end of the post-foaming device (2); the foam stabilizing plate group is used for adjusting the throat size. The foam stabilizing plate group includes a plurality of foam control plates (3). The foam control plate (3) includes a bottom plate (301), and a top plate (302) is fixedly connected to the bottom plate (301). A plurality of uniformly distributed fixed columns (4) and movable columns (5) are arranged between the bottom plate (301) and the top plate (302). Each movable column (5) is equidistantly arranged between two adjacent fixed columns (4); A C-shaped frame (6) is clamped on the outside of the foam stabilizing plate group, and electromagnet bars matching the movable columns (5) are installed at both the upper and lower ends of the C-shaped frame (6).

2. The preparation device of an enhanced foam flooding system according to claim 1, characterized in that The foaming input end is used to output a foaming agent. The foaming agent stored in the first liquid storage tank includes an anionic surfactant and a non-ionic surfactant.

3. The preparation device of an enhanced foam flooding system according to claim 2, characterized in that, The foam stabilizer used in the foam stabilizer input device includes: polymer XG, hydrophobically associating polymer HAWP, and polymer KY.

4. The preparation device of an enhanced foam flooding system according to claim 3, characterized in that, The front foaming end, the pre-foaming device (1), the rear foam stabilizing end, and the post-foaming device (2) are connected by heat-insulating pipes.

5. The preparation device of an enhanced foam flooding system according to claim 4, characterized in that, The output end of the post-foaming device (2) includes a foaming net. A plurality of rows of uniformly distributed foaming holes are arranged on the foaming net. Each row of the foaming net is respectively matched with the input end of a foam control plate (3).

6. The preparation device of an enhanced foam oil displacement system according to claim 5, characterized in that, The C-shaped frame (6) includes a pair of fixed beams, and a hydraulic telescopic device is connected between the pair of fixed beams.

7. The preparation device of an enhanced foam flooding system according to claim 6, characterized in that, It includes a preparation device control system. The preparation device control system includes a processor. The front foaming end, the pre-foaming device (1), the rear foam stabilizing end, and the post-foaming device (2) are all signal-connected to the processor, and a data processing module and a control module are installed in the processor.

8. The preparation method of a preparation device for an enhanced foam oil displacement system according to claim 7, characterized in that, The specific method includes: S1, First, output a gas-liquid mixture mixed with a foaming agent through the fluid source input end; S2, Then, perform primary foaming through the pre-foaming device (1); S3, During the process of transferring the fluid output after foaming to the post-foaming device (2), add a foam stabilizer and mix; S4, Perform secondary foaming through the post-foaming device (2), and the output foam is output through the foam stabilizing plate group to form a uniform foam group.

9. The preparation method according to claim 8, characterized in that, Both the upper and lower ends of the movable column (5) are provided with sliding grooves, positioning columns matching the sliding grooves are fixedly connected to both the bottom plate (301) and the top plate (302), an electric guide rail is installed on the C-shaped frame (6), the C-shaped frame (6) slides relative to the foam stabilizing plate group. Before the foaming device in step S4 works: the C-shaped frame (6) is driven to displace by the electric guide rail, and at this time, multiple movable columns (5) in the foam stabilizing plate group are driven to move, so as to adjust the distance between the movable column (5) and the fixed column (4).

10. The preparation method according to claim 8, characterized in that, A receiving cavity matching the movable column (5) is provided on the bottom plate (301), and a sealing ring matching the movable column (5) is fixedly connected to the top plate (302). Before the foaming device in step S4 works: the electromagnet in the C-shaped frame (6) is powered off, and at this time, multiple movable columns (5) in the foam stabilizing plate group are received into the receiving cavity.

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