A three-phase foam profile control ground injection device

Abstract

The utility model discloses a three -phase foam profile control ground injection device, include: plunger pump is connected in the foam generator one side through injection pipe, instillation pump is connected in the foam generator bottom near plunger pump one end through injection pipe, and the gas injection equipment is connected in the foam generator bottom far from plunger pump one end through injection pipe, and the foam output pipeline is connected in the other side of foam generator, is equipped with stop valve on the foam output pipeline. The utility model solves the problem that the stable foam is formed in the stirring preparation process of high viscosity particle - foam suspension, causes the problem of the continuous pump injection of pump suction liquid difficulty.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development technology, and in particular to a three-phase foam profile control surface injection device. Background Technology

[0002] Currently, foam profile control is a tertiary oil recovery method used in the later stages of oilfield development under high water-cut conditions. It combines the advantages of gas flooding and chemical flooding technologies, utilizing the sealing effect of foam and expanding the swept volume of water injection or steam to improve oil displacement efficiency and recovery rate. Air foam profile control, nitrogen foam profile control, and carbon dioxide foam flooding are all highly promising technologies for enhancing oil recovery. Three-phase foam involves adding certain solid particles that bind well with the foam to conventional foam fluid, improving the foam's stability and sealing strength, thus enabling better sealing and profile control effects. Summary of the Invention

[0003] The purpose of this invention is to provide a three-phase foam profile control ground injection device, which solves the problem that the formation of stable foam during the stirring and preparation of high-viscosity particle-foam suspension leads to difficulty in pumping and continuous injection. To achieve this purpose, the invention provides a three-phase foam profile control ground injection device, comprising: a foam generator, a plunger pump, a drip pump, an injection device, and a foam output pipe. The plunger pump is connected to one side of the foam generator via an injection pipe. The drip pump is connected to the bottom of the foam generator near the plunger pump via an injection pipe. The injection device is connected to the bottom of the foam generator away from the plunger pump via an injection pipe. The foam output pipe is connected to the other side of the foam generator, and a shut-off valve is provided on the foam output pipe.

[0004] As a preferred embodiment of this utility model, the injection pipe includes a particle suspension injection pipe, a foam liquid injection pipe, and a gas injection pipe. The particle suspension injection pipe is connected to the plunger pump and the foam generator, and a shut-off valve is provided on the particle suspension injection pipe. The foam liquid injection pipe is connected to the drip pump and the foam generator, and a shut-off valve is provided on the foam liquid injection pipe. The gas injection pipe is connected to the gas injection device and the foam generator, and a shut-off valve is provided on the gas injection pipe.

[0005] As a preferred embodiment of this utility model, the displacement of the plunger pump is 5 to 30 m³ / h, and the displacement of the drip pump is 0.05 to 1 m³ / h.

[0006] As a preferred embodiment of this utility model, the foam generator includes an outer foam tube and an inner foam tube. The inner foam tube is sleeved inside the outer foam tube. A plurality of gas injection holes are formed on the surface of the inner foam tube. One end of the outer foam tube is connected to the particle suspension injection tube, and the other end of the outer foam tube is connected to the foam output pipe. The bottom end of the outer foam tube is connected in sequence to the foam liquid injection tube and the gas injection tube. The foam liquid injection tube is located near the end of the particle suspension injection tube. The gas injection tube connects the annulus between the outer foam tube and the inner foam tube.

[0007] As a preferred embodiment of this utility model, the inner wall of the outer foam tube is equipped with a stirring blade, and the stirring blade is located between the foam liquid injection pipe and the inner foam tube.

[0008] As a preferred embodiment of this utility model, the bottom end of the foam outer tube is connected to a slag discharge port, the slag discharge port is connected to the annular space between the foam outer tube and the foam inner tube, and the slag discharge port is located between the gas injection pipe and the foam output pipe.

[0009] As a preferred embodiment of this utility model, the total area of ​​the gas injection holes is 1 / 30 to 1 / 10 of the wall area of ​​the foam inner tube, and the diameter of the gas injection holes is 1 / 10 of the diameter of the inner tube.

[0010] Compared with the prior art, this utility model provides a three-phase foam profile control ground injection device, which has the following beneficial effects: A particle suspension and a foam solution are prepared separately in a mixing tank connected to a plunger pump and a drip pump, wherein the foam agent concentration in the foam solution is 20-40%. The injection displacement of the plunger pump and the drip pump is adjusted, with the displacement of the drip pump being 1-2% of the displacement of the plunger pump, so that the foam agent concentration in the mixed particle foam solution is about 0.5%.

[0011] The gas injection equipment, drip pump, and plunger pump are turned on sequentially to inject gas, foam liquid, and particle suspension, respectively. First, gas is injected to fill the foam generator; then, the foam liquid is injected into the particle foam liquid injection pipe; finally, the particle suspension is injected. After the particle suspension and foam liquid enter the particle foam liquid injection pipe, they drive the stirring fan blades to rotate, ensuring thorough mixing of the particle suspension and foam liquid before entering the inner foam pipe. Because the diameter of the inner foam pipe is smaller than that of the particle foam injection pipe, the flow velocity increases, the pipe wall pressure decreases, and the gas more easily enters the inner foam pipe from the injection hole, mixing thoroughly with the particle foam liquid to form a stable three-phase foam. After the three-phase foam is formed in the inner foam pipe, it is injected into the wellhead from the foam output pipe.

[0012] After the construction was completed, the plunger pump, drip pump, and steam injection equipment were shut down in sequence, and the wellhead gate valve was closed. The pressure of the plunger pump, drip pump, and steam injection equipment was released, and the slag discharge port was opened to remove the remaining particles and liquid. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the foam generator of this utility model;

[0015] 1 is a foam generator; 2 is a plunger pump; 3 is a drip pump; 4 is a gas injection device; 5 is a foam output pipe; 6 is a shut-off valve; 7 is a particle suspension injection pipe; 8 is a foam liquid injection pipe; 9 is a gas injection pipe; 101 is an outer foam pipe; 102 is an inner foam pipe; 103 is a gas injection hole; 104 is a stirring fan blade; 105 is a slag discharge port. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1 Figure 2 This utility model provides a solution comprising: a foam generator 1, a plunger pump 2, a drip pump 3, an injection device 4, and a foam output pipe 5. The plunger pump 2 is connected to one side of the foam generator 1 via an injection pipe. The drip pump 3 is connected to the bottom of the foam generator 1 near the plunger pump via an injection pipe. The injection device 4 is connected to the bottom of the foam generator 1 away from the plunger pump via an injection pipe. The foam output pipe 5 is connected to the other side of the foam generator 1, and a shut-off valve 6 is provided on the foam output pipe 5.

[0018] In one embodiment of this utility model, the injection pipe includes a particle suspension injection pipe 7, a foam liquid injection pipe 8, and a gas injection pipe 9. The particle suspension injection pipe 7 is connected to the plunger pump 2 and the foam generator 1, and a shut-off valve 6 is provided on the particle suspension injection pipe 7. The foam liquid injection pipe 8 is connected to the drip pump 3 and the foam generator 1, and a shut-off valve 6 is provided on the foam liquid injection pipe 8. The gas injection pipe 9 is connected to the gas injection device 4 and the foam generator 1, and a shut-off valve 6 is provided on the gas injection pipe 9.

[0019] In one embodiment of this utility model, the displacement of the plunger pump 2 is 5 to 30 m3 / h, and the displacement of the drip pump 3 is 0.05 to 1 m3 / h.

[0020] In one embodiment of this utility model, the foam generator 1 includes an outer foam tube 101 and an inner foam tube 102. The inner foam tube 102 is sleeved inside the outer foam tube 101. A plurality of gas injection holes 103 are formed on the surface of the inner foam tube 102. One end of the outer foam tube 101 is connected to the particle suspension injection pipe 7, and the other end of the outer foam tube 101 is connected to the foam output pipe 5. The bottom end of the outer foam tube 101 is connected in sequence to the foam liquid injection pipe 8 and the gas injection pipe 9. The foam liquid injection pipe 8 is located near the end of the particle suspension injection pipe 7. The gas injection pipe 9 connects the annular space between the outer foam tube 101 and the inner foam tube 102.

[0021] In one embodiment of the present invention, an agitator blade 104 is installed on the inner wall of the outer foam tube 101, and the agitator blade 104 is located between the foam liquid injection tube 8 and the inner foam tube 102.

[0022] In one embodiment of the present invention, the bottom end of the foam outer tube 101 is connected to a slag discharge port 105, the slag discharge port 105 is connected to the annular space between the foam outer tube 101 and the foam inner tube 102, and the slag discharge port 105 is located between the gas injection pipe 9 and the foam output pipe 5.

[0023] In one embodiment of this utility model, the total area of ​​the gas injection hole 103 is 1 / 30 to 1 / 10 of the wall area of ​​the foam inner tube 102, and the diameter of the gas injection hole 103 is 1 / 10 of the diameter of the inner tube.

[0024] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A three-phase foam profile control ground injection device, characterized in that, include: The foam generator (1), plunger pump (2), drip pump (3), air injection device (4) and foam output pipe (5) are connected to one side of the foam generator (1) through an injection pipe. The drip pump (3) is connected to the bottom of the foam generator (1) near the plunger pump through an injection pipe. The air injection device (4) is connected to the bottom of the foam generator (1) away from the plunger pump through an injection pipe. The foam output pipe (5) is connected to the other side of the foam generator (1). A shut-off valve (6) is provided on the foam output pipe (5).

2. The three-phase foam profile control ground injection device according to claim 1, characterized in that: The injection pipe includes a particle suspension injection pipe (7), a foam liquid injection pipe (8), and a gas injection pipe (9). The particle suspension injection pipe (7) is connected to the plunger pump (2) and the foam generator (1). A shut-off valve (6) is provided on the particle suspension injection pipe (7). The foam liquid injection pipe (8) is connected to the drip pump (3) and the foam generator (1). A shut-off valve (6) is provided on the foam liquid injection pipe (8). The gas injection pipe (9) is connected to the gas injection device (4) and the foam generator (1). A shut-off valve (6) is provided on the gas injection pipe (9).

3. The three-phase foam profile control ground injection device according to claim 1, characterized in that: The displacement of the plunger pump (2) is 5 to 30 m3 / h, and the displacement of the drip pump (3) is 0.05 to 1 m3 / h.

4. A three-phase foam profile control ground injection device according to claim 2, characterized in that: The foam generator (1) includes an outer foam tube (101) and an inner foam tube (102). The inner foam tube (102) is sleeved inside the outer foam tube (101). The surface of the inner foam tube (102) is provided with a plurality of gas injection holes (103). One end of the outer foam tube (101) is connected to the particle suspension injection pipe (7), and the other end of the outer foam tube (101) is connected to the foam output pipe (5). The bottom end of the outer foam tube (101) is connected to the foam liquid injection pipe (8) and the gas injection pipe (9) in sequence. The foam liquid injection pipe (8) is set near the end of the particle suspension injection pipe (7), and the gas injection pipe (9) connects the annulus between the outer foam tube (101) and the inner foam tube (102).

5. A three-phase foam profile control ground injection device according to claim 4, characterized in that: The inner wall of the outer foam tube (101) is equipped with a stirring blade (104), and the stirring blade (104) is located between the foam liquid injection tube (8) and the inner foam tube (102).

6. A three-phase foam profile control ground injection device according to claim 4, characterized in that: The bottom end of the foam outer tube (101) is connected to a slag discharge port (105), which connects the annular space between the foam outer tube (101) and the foam inner tube (102), and the slag discharge port (105) is located between the gas injection pipe (9) and the foam output pipe (5).

7. A three-phase foam profile control ground injection device according to claim 4, characterized in that: The total area of ​​the gas injection hole (103) is 1 / 30 to 1 / 10 of the wall area of ​​the foam inner tube (102), and the diameter of the gas injection hole (103) is 1 / 10 of the diameter of the inner tube.

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