Adjustable injection device for low-permeability reservoir emulsion oil-displacing agent

Abstract

The utility model relates to the technical field of oil-displacing agent injection, and discloses an adjustable injection device for low-permeability oil reservoir emulsion oil-displacing agent, which comprises a storage tank, the bottom of the storage tank is fixedly communicated with a master control room, the bottom of the master control room is fixedly communicated with a delivery pipe, and one side of the delivery pipe far away from the master control room is fixedly communicated with an injection pump. The injection adjusting mechanism is used for adjusting the injection mode in the process of injecting the emulsified oil displacement agent, the automatic quantity control mechanism is used for automatically closing the injection opening so as to accurately control the injection quantity, and by arranging the injection adjusting mechanism, the oil displacement agent enters the cavity from the branch opening and then is discharged out of the pipe through the oil displacement agent discharging opening, so that the dispersed injection effect is achieved; and the injection pipe can be directly introduced into the bottom for single-point injection, the injection pressure and the injection mode can be adjusted according to the actual condition of the oil reservoir so as to improve the oil displacement efficiency, and the automatic quantity control mechanism is arranged, so that the adsorption loss caused by excessive injection can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of oil displacement agent injection, in particular to an adjustable injection device for emulsified oil displacement agent in low permeability oil reservoirs. Background Art

[0002] An emulsion flooding agent for low permeability reservoirs is a chemical agent used to improve the recovery rate of low permeability reservoirs. It mainly activates residual oil by forming an emulsion, thereby improving micro-oil washing efficiency and expanding macro-swept volume. The adjustable injection device usually includes a liquid storage tank, injection pump, control system, etc., which is used to control the injection rate and injection volume of the emulsion flooding agent to ensure its uniform distribution and effective effect in the reservoir.

[0003] In existing technologies, emulsion flooding agents may have good fluidity and permeability and can spontaneously diffuse in oil reservoirs. However, depending on the actual conditions of the reservoir, the injection pressure and injection method of the flooding agent may directly affect the oil recovery efficiency. In addition, the adsorption loss of the emulsion flooding agent in the reservoir may affect its oil recovery effect. In particular, when the rock particles in the reservoir are small, the number of pores and pore surface area increase, and the amount of emulsion flooding agent adsorbed by the mineral particles will increase sharply, thereby reducing the oil recovery efficiency.

[0004] Therefore, an adjustable injection device for emulsified oil displacement agent in low permeability oil reservoirs is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide an adjustable injection device for an emulsified oil displacement agent in a low permeability oil reservoir, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an adjustable injection device for an emulsion flooding agent in a low-permeability oil reservoir, comprising a storage tank, the bottom of which is fixedly connected to a main control room, the bottom of which is fixedly connected to a delivery pipe, the side of the delivery pipe away from the main control room being fixedly connected to an injection pump, and further comprising:

[0007] Adjust the injection mechanism to adjust the injection method during the injection of the emulsified oil displacement agent;

[0008] Automatic volume control mechanism, used to automatically close the injection port to accurately control the injection volume.

[0009] Preferably, the adjustment injection mechanism includes an injection pipe fixedly connected to the bottom of the injection pump, the storage tank, the main control room and the injection pump are all fixedly connected to the surface layer at the bottom, the bottom of the surface layer is fixedly connected to the oil reservoir layer, and the bottom of the injection pipe is fixedly passed through the surface layer and extends into the oil reservoir layer.

[0010] Preferably, the adjustment injection mechanism also includes a distributor fixedly connected to the outer wall of the injection pipe, a cavity is opened at the top of the distributor, the outer wall of the injection pipe is also fixedly connected to a valve, the bottom of the valve is fixedly connected to a branch port, the inner wall of the branch port is fixedly connected to the outer wall of the injection pipe, the valve and the branch port are both located in the cavity, and a plurality of oil-displacing agent discharge ports are equidistantly opened in the middle of the distributor, and the oil-displacing agent discharge ports are connected to the cavity.

[0011] Preferably, the automatic quantity control mechanism includes a fixed sleeve equidistantly fixedly connected to the outer wall of the middle part of the distributor, and multiple fixed sleeves are provided and their positions correspond to the oil-displacing agent discharge outlets. The inner walls of multiple fixed sleeves are fixedly connected with reset springs, and the sides of multiple reset springs away from the fixed sleeves are fixedly connected with balls. Multiple balls are clamped on the inner wall of the distributor, and the outer walls of the balls extend into the cavity.

[0012] Preferably, the ball abuts against the connection between the oil-displacing agent outlet and the cavity.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By adjusting the setting of the injection mechanism, the oil displacement agent enters the cavity from the branch port and then is discharged out of the pipe through the oil displacement agent outlet to achieve the effect of dispersed injection. It can also be directly injected into the bottom single point through the injection pipe. The injection pressure and injection method can be adjusted according to the actual situation of the reservoir to improve the oil displacement efficiency.

[0015] 2. The automatic control mechanism not only evenly disperses the injection of the oil-displacing agent, but also immediately resets the ball and automatically closes by the force of the reset spring after the injection is completed, thereby preventing external soil from entering the distributor. At the same time, the injection amount of the emulsified oil-displacing agent can be accurately controlled to avoid adsorption loss caused by excessive injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 For this utility model Figure 1 A schematic diagram of the structure enlarged in the middle;

[0018] Figure 3 This is a three-dimensional cross-sectional view of the connection of the distributor of the utility model;

[0019] Figure 4 For this utility model Figure 3 Schematic diagram of the structure of the enlarged connection at point B.

[0020] In the picture:

[0021] 1. Storage tank; 2. Main control room; 3. Delivery pipe; 4. Injection pump; 5. Surface layer; 6. Reservoir layer; 7. Injection pipe; 8. Distributor; 9. Fixing sleeve; 10. Oil displacement agent outlet; 11. Return spring; 12. Ball; 13. Branch port; 14. Valve; 15. Cavity. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1 to 4 , is an embodiment provided by the utility model: an adjustable injection device for an emulsion flooding agent in a low permeability oil reservoir, comprising a storage tank 1, the bottom of the storage tank 1 is fixedly connected to a main control room 2, the bottom of the main control room 2 is fixedly connected to a delivery pipe 3, and the side of the delivery pipe 3 away from the main control room 2 is fixedly connected to an injection pump 4, and further comprising:

[0024] Adjust the injection mechanism to adjust the injection method during the injection of the emulsified oil displacement agent;

[0025] Automatic volume control mechanism, used to automatically close the injection port to accurately control the injection volume;

[0026] The injection adjustment mechanism includes an injection pipe 7 fixedly connected to the bottom of the injection pump 4. The bottoms of the storage tank 1, the main control room 2 and the injection pump 4 are all fixedly connected to the surface layer 5. The bottom of the surface layer 5 is fixedly connected to the oil reservoir layer 6. The bottom of the injection pipe 7 is fixedly passed through the surface layer 5 and extends into the oil reservoir layer 6.

[0027] The injection adjustment mechanism also includes a distributor 8 fixedly connected to the outer wall of the injection pipe 7, a cavity 15 is opened at the top of the distributor 8, a valve 14 is also fixedly connected to the outer wall of the injection pipe 7, a branch port 13 is fixedly connected to the bottom of the valve 14, the inner wall of the branch port 13 is fixedly connected to the outer wall of the injection pipe 7, the valve 14 and the branch port 13 are both located in the cavity 15, and a plurality of oil-displacing agent discharge ports 10 are equidistantly opened in the middle of the distributor 8, and the oil-displacing agent discharge ports 10 are connected to the cavity 15;

[0028] Among them: the valve 14 is electrically connected to the main control room 2, so that the oil-displacing agent enters the cavity 15 from the branch port 13, and then is discharged out of the pipe through the oil-displacing agent outlet 10, achieving the effect of dispersed injection. It can also be directly injected into the bottom single point through the injection pipe 7. The injection pressure and injection method can be adjusted according to the actual situation of the oil reservoir.

[0029] The automatic control mechanism includes a fixed sleeve 9 equidistantly fixedly connected to the outer wall of the middle part of the distributor 8. The fixed sleeve 9 is provided with multiple and its position corresponds to the oil-displacing agent outlet 10. The inner walls of the multiple fixed sleeves 9 are fixedly connected to the return springs 11. The side of the multiple return springs 11 away from the fixed sleeve 9 is fixedly connected to the balls 12. The multiple balls 12 are all snap-fitted to the inner wall of the distributor 8, and the outer walls of the balls 12 extend into the cavity 15.

[0030] The ball 12 abuts against the connection between the oil-displacing agent outlet 10 and the cavity 15;

[0031] Among them: not only can the injection of the oil-displacing agent be evenly dispersed, but also after the injection is completed, the ball 12 can be immediately reset by the elastic force of the reset spring 11 and automatically closed, thereby preventing external soil from entering the distributor 8, and at the same time, the injection amount of the emulsified oil-displacing agent can be accurately controlled.

[0032] The working principle of the above implementation is as follows: the emulsified oil-displacing agent is injected into the injection pipe 7 through the injection pump 4 in the storage tank 1 and reaches the oil reservoir 6. According to the actual situation of the oil reservoir, the valve 14 can be opened to allow the oil-displacing agent to enter the cavity 15 from the branch port 13, and then be discharged out of the pipe through the oil-displacing agent outlet 10 to achieve the effect of dispersed injection. It can also be directly injected into the bottom single point through the injection pipe 7. By adjusting the injection pressure and injection method, the oil displacement efficiency can be improved. In addition, after the oil-displacing agent enters the cavity 15, the hydraulic pressure pushes the ball 12 in the direction of the reset spring 11 to connect the oil-displacing agent outlet 10 with the cavity 15, and the oil-displacing agent is discharged. Not only is the injection of the oil-displacing agent evenly dispersed, but after the injection is completed, the ball 12 can be immediately reset by the elastic force of the reset spring 11 and automatically closed, thereby achieving the effect of accurately adjusting the injection amount and preventing external soil from entering the distributor 8.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable injection device for an emulsified oil displacement agent in a low permeability reservoir, comprising a storage tank (1), characterized in that: The bottom of the storage tank (1) is fixedly connected to a main control room (2), the bottom of the main control room (2) is fixedly connected to a delivery pipe (3), and the side of the delivery pipe (3) away from the main control room (2) is fixedly connected to an injection pump (4), and further comprises: Adjust the injection mechanism to adjust the injection method during the injection of the emulsified oil displacement agent; Automatic volume control mechanism, used to automatically close the injection port to accurately control the injection volume.

2. The adjustable injection device for emulsified oil displacement in low permeability reservoirs according to claim 1, characterized in that: The injection adjustment mechanism comprises an injection pipe (7) fixedly connected to the bottom of the injection pump (4); the storage tank (1), the main control room (2) and the injection pump (4) are all fixedly connected to the surface layer (5) at the bottom; the bottom of the surface layer (5) is fixedly connected to the oil reservoir layer (6); the bottom of the injection pipe (7) is fixedly passed through the surface layer (5) and extends into the oil reservoir layer (6).

3. The adjustable injection device for emulsified oil displacement in low permeability reservoirs according to claim 2, characterized in that: The injection adjustment mechanism further comprises a distributor (8) fixedly connected to the outer wall of the injection pipe (7), a cavity (15) being provided at the top of the distributor (8), a valve (14) being fixedly connected to the outer wall of the injection pipe (7), a branch port (13) being fixedly connected to the bottom of the valve (14), an inner wall of the branch port (13) being fixedly connected to the outer wall of the injection pipe (7), the valve (14) and the branch port (13) being both located in the cavity (15), a plurality of oil-displacing agent discharge ports (10) being equidistantly provided in the middle of the distributor (8), and the oil-displacing agent discharge ports (10) being connected to the cavity (15).

4. The adjustable injection device for emulsified oil displacement agent in low permeability reservoirs according to claim 3, characterized in that: The automatic quantity control mechanism includes a fixed sleeve (9) fixedly connected to the outer wall of the middle part of the distributor (8) at equal intervals. The fixed sleeve (9) is provided with multiple and its position corresponds to the oil-displacing agent outlet (10). The inner walls of the multiple fixed sleeves (9) are fixedly connected with a reset spring (11). The side of the multiple reset springs (11) away from the fixed sleeve (9) is fixedly connected with a ball (12). The multiple balls (12) are clamped on the inner wall of the distributor (8), and the outer wall of the ball (12) extends into the cavity (15).

5. The adjustable injection device for emulsified oil displacement in low permeability reservoirs according to claim 4, characterized in that: The ball (12) abuts against the connection between the oil-displacing agent outlet (10) and the cavity (15).

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