Indoor oil displacement test device for alternately injecting mixed phases of water and carbon dioxide

Abstract

The utility model discloses an indoor oil displacement test device for alternately injecting water and carbon dioxide mixed phase, which comprises an outer cylinder and a toughened glass tube, quartz sand is filled in the toughened glass tube, two ends of the toughened glass tube are hermetically connected with the outer cylinder, simulated formation water is filled between the toughened glass tube and the outer cylinder, and the simulated formation water is filled between the toughened glass tube and the outer cylinder. And a plurality of visual windows are arranged on the outer side wall of the outer cylinder body at equal intervals. According to the utility model, the whole-process observation of quartz sand water flooding and carbon dioxide oil flooding in the toughened glass tube is realized through the plurality of visual windows, and the uniform distribution of the pressure in the outer cylinder is realized by adjusting the angles of the plurality of visual windows, so that the fracture caused by overhigh pressure at a certain visual window is avoided; the maximum internal confining pressure can reach 35-40 MPa, and meanwhile, the oil displacement conditions at different angle positions in the tempered glass pipe can be observed through the visual windows at different angles.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas injection oil recovery, and in particular relates to an indoor oil recovery test device for alternately injecting mixed phases of water and carbon dioxide. Background Art

[0002] Carbon dioxide flooding is a technology that injects carbon dioxide into oil layers to increase oil field recovery. Under standard conditions, carbon dioxide is a colorless, odorless gas that is heavier than air and has a density of 1.977 g / L. When the temperature and pressure are higher than the critical point, the properties of carbon dioxide change, and its form is close to that of a liquid, its viscosity is close to that of a gas, and its diffusion coefficient is 100 times that of a liquid. At this time, carbon dioxide is a very good solvent, and its solubility and penetration are both higher than organic solvents such as water, ethanol, and ether. If the carbon dioxide fluid is brought into contact with the substance to be separated, it can selectively extract the components of the substance with different polarity, boiling point, and molecular weight in turn. When the pressure of the extracted mixture drops or the temperature rises, the supercritical fluid in it becomes ordinary carbon dioxide gas, and the extracted substance is completely or basically precipitated, and the carbon dioxide and the extract are quickly separated into two phases, so that its effective components can be extracted from many substances. Carbon dioxide flooding can increase crude oil recovery by 7% to 15% and extend the production life of oil wells by 15 to 20 years.

[0003] At present, in indoor experiments on carbon dioxide oil recovery, the core to be tested is usually saturated with formation water and formation crude oil in turn, and then water and carbon dioxide oil recovery are carried out. However, in the real situation of formation crude oil, the upper and lower parts of the rock formation are subject to huge pressure, and this part of the pressure also needs to be simulated during indoor simulation. This limits the observation effect of many indoor oil recovery experimental devices, making it impossible to observe the oil recovery situation inside the core in real time. The oil recovery devices that can observe the oil recovery situation inside the core in real time often have pressures sufficient to simulate the real formation pressure. Utility Model Content

[0004] The utility model aims to provide an indoor oil displacement test device for alternately injecting water and carbon dioxide mixed phases, solving the problem that the experimental device for studying carbon dioxide oil displacement cannot directly reflect the oil displacement situation inside the core.

[0005] The technical scheme adopted by the utility model is an indoor oil displacement test device for alternately injecting water and carbon dioxide mixed phases, comprising an outer cylinder, a tempered glass tube is arranged inside the outer cylinder, the interior of the tempered glass tube is filled with quartz sand for simulating formation rock, both ends of the tempered glass tube are sealedly connected to the outer cylinder, the space between the tempered glass tube and the outer cylinder is filled with simulated formation water, a plurality of visualization windows are arranged at equal intervals on the outer side wall of the outer cylinder, the front end of the tempered glass tube is connected to a three-way valve through a first conduit, and both ends of the three-way valve are respectively connected to a high-pressure water injection tank and a high-pressure gas injection tank through a second conduit.

[0006] The utility model is also characterized in that:

[0007] Furthermore, one end of the water injection pump provided on the top of the high-pressure water injection tank is connected to the corresponding second conduit, and the other end of the water injection pump is connected to the front end of the outer cylinder through a third conduit.

[0008] Description: The water injection pump of the high-pressure water injection tank can be used to inject water into the tempered glass tube to simulate the oil displacement process, and water can also be injected into the outer cylinder to simulate the confining pressure of the tempered glass tube.

[0009] Furthermore, an air injection pump provided on the top of the high-pressure air injection tank is connected to the corresponding second conduit.

[0010] Furthermore, there are a total of 6 visualization windows, which are arc-shaped segments embedded in the outer wall of the outer cylinder, with an arc of 90 to 120°. The upper end of the visualization window at the front end is located at the top of the outer cylinder, and the visualization window on the left is rotated 45 to 60° clockwise from the center axis of the outer cylinder compared to the visualization window on the right.

[0011] Description: The whole process of quartz sand water flooding and carbon dioxide flooding inside the tempered glass tube can be observed through multiple visualization windows. The angles of multiple visualization windows can be adjusted to achieve uniform distribution of pressure inside the outer cylinder to avoid rupture due to excessive pressure at a certain visualization window. At the same time, visualization windows at different angles can observe the oil flooding conditions at different angles inside the tempered glass tube.

[0012] Furthermore, the visualization window located at the rearmost end is at the bottom of the outer cylinder, and reflective mirrors are provided on the bottom side and the top side corresponding to the visualization window, and a fixing rod is provided on the back side of the two reflective mirrors, and the ends of the two fixing rods are fixedly connected to a fixing ring, and the top of the fixing ring is fixedly connected to the outer side wall of the top of the outer cylinder through a connecting rod.

[0013] By setting the reflective mirror, a visual window located at the bottom of the outer cylinder can be observed, so that the oil displacement situation inside the tempered glass tube can be observed without blind spots.

[0014] Furthermore, a liquid outlet pipe is provided at the rear end of the tempered glass tube.

[0015] Note: The displaced crude oil and water are collected by setting up a liquid outlet pipe.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] (1) The utility model is an indoor oil displacement test device for alternate injection of water and carbon dioxide mixed phases. The outer cylinder and the tempered glass tube are used to pressurize the tempered glass tube, and the whole process of quartz sand water displacement and carbon dioxide oil displacement inside the tempered glass tube is observed through multiple visualization windows. The angles of the multiple visualization windows are adjusted to achieve uniform distribution of the pressure inside the outer cylinder, thereby avoiding rupture due to excessive pressure at a certain visualization window. The maximum internal confining pressure can reach 35-40 MPa. At the same time, visualization windows at different angles can observe the oil displacement conditions at different angles inside the tempered glass tube.

[0018] (2) The utility model provides an indoor oil displacement test device for alternately injecting a mixed phase of water and carbon dioxide. The device can observe a visual window at the bottom of the outer cylinder through the setting of a reflective mirror, thereby realizing the observation of the oil displacement situation inside the tempered glass tube without blind spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall front-end structure of an indoor oil displacement test device for alternate injection of water and carbon dioxide;

[0020] Figure 2 It is a schematic diagram of the overall structure of the rear end of an indoor oil recovery test device for alternate injection of water and carbon dioxide;

[0021] Figure 3 It is a main view and internal structure diagram of an indoor oil recovery test device with alternating injection of water and carbon dioxide mixed phase.

[0022] In the figure, 1-outer cylinder, 2-tempered glass tube, 21-first conduit, 22-liquid outlet pipe, 3-visualization window, 4-three-way valve, 41-second conduit, 5-high-pressure water injection tank, 51-water injection pump, 52-third conduit, 6-high-pressure air injection tank, 61-air injection pump, 7-reflective mirror, 71-fixing rod, 72-fixing ring, 73-connecting rod. DETAILED DESCRIPTION

[0023] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1 and 2As shown, the indoor oil displacement test device for alternate injection of water and carbon dioxide mixed phase of the utility model comprises an outer cylinder 1, a tempered glass tube 2 located inside the outer cylinder 1, the interior of the tempered glass tube 2 is filled with quartz sand for simulating formation rock, both ends of the tempered glass tube 2 are sealedly connected to the outer cylinder 1, the space between the tempered glass tube 2 and the outer cylinder 1 is filled with simulated formation water, 6 visualization windows 3 are evenly spaced on the outer wall of the outer cylinder 1, the front end of the tempered glass tube 2 is connected to a three-way valve 4 through a first conduit 21, the three-way valve 4 is a commercially available product with two control valves, the two ends of the three-way valve 4 are respectively connected to a high-pressure water injection tank 5 and a high-pressure gas injection tank 6 through a second conduit 41, and a liquid outlet pipe 22 is provided at the rear end of the tempered glass tube 2;

[0026] like Figure 1 As shown, one end of the water injection pump 51 provided on the top of the high-pressure water injection tank 5 is connected to the corresponding second conduit 41, and the other end of the water injection pump 51 is connected to the front end of the outer cylinder 1 through a third conduit 52, and the air injection pump 61 provided on the top of the high-pressure air injection tank 6 is connected to the corresponding second conduit 41;

[0027] like Figure 1 and 3 As shown, the visualization window 3 is an arc segment embedded in the outer wall of the outer cylinder 1, and the curvature of the visualization window 3 is 105°. The upper end of the visualization window 3 located at the front end is located at the top of the outer cylinder 1. The visualization window 3 located on the left is rotated 50° clockwise about the central axis of the outer cylinder 1 compared to the visualization window 3 on the right. The visualization window 3 located at the rear end is at the bottom of the outer cylinder 1, and a reflective mirror 7 is provided on the bottom side and the top side corresponding to the visualization window 3. A fixing rod 71 is provided on the back of the two reflecting mirrors 7. The ends of the two fixing rods 71 ​​are fixedly connected to a fixing ring 72. The top of the fixing ring 72 is fixedly connected to the outer wall of the top of the outer cylinder 1 through a connecting rod 73.

[0028] Example 2

[0029] The difference between this embodiment and embodiment 1 is that:

[0030] like Figure 1 and 3 As shown, the visualization window 3 is an arc segment embedded in the outer wall of the outer cylinder 1, and the arc of the visualization window 3 is 120°. The upper end of the visualization window 3 located at the front end is located at the top of the outer cylinder 1, and the visualization window 3 located on the left is rotated 45° clockwise about the central axis of the outer cylinder 1 compared to the visualization window 3 on the right side, and the visualization window 3 located at the rear end is at the bottom of the outer cylinder 1.

[0031] Example 3

[0032] The difference between this embodiment and embodiment 1 is that:

[0033] like Figure 1 and 3 As shown, the visualization window 3 is an arc segment embedded in the outer wall of the outer cylinder 1, and the curvature of the visualization window 3 is 90°. The upper end of the visualization window 3 located at the front end is located at the top of the outer cylinder 1, and the visualization window 3 located on the left is rotated 60° clockwise about the central axis of the outer cylinder 1 compared to the visualization window 3 on the right side, and the visualization window 3 located at the rear end is at the bottom of the outer cylinder 1.

[0034] Working principle:

[0035] The working principle of the indoor oil displacement test device for alternate injection of water and carbon dioxide mixed phase of the utility model is briefly described below. When in use, it is necessary to first saturate the simulated formation crude oil in the quartz sand inside the tempered glass tube 2, and then start the water injection pump 51 to inject the simulated formation water inside the high-pressure water injection tank 5 into the space between the outer cylinder 1 and the tempered glass tube 2 through the third conduit 52, so as to form a confining pressure outside the tempered glass tube 2, and the maximum internal confining pressure can reach 35-40MPa, and then start the water displacement simulation experiment;

[0036] The simulated formation water in the high-pressure water injection tank 5 is injected into the tempered glass tube 2 by starting the water injection pump 51 to displace the quartz sand saturated with the simulated formation crude oil. The three-way valve 4 is used to control the water from entering the second conduit 41 corresponding to the high-pressure gas injection tank 6. The simulated formation crude oil displaced is collected through the liquid outlet pipe 22, and then a carbon dioxide displacement is started.

[0037] The gas injection pump 61 is turned on to inject carbon dioxide gas into the glass tube 2 to saturate the quartz sand with simulated formation crude oil and part of water. The three-way valve 4 is used to control the water from entering the second conduit 41 corresponding to the high-pressure water injection tank 5. The simulated formation crude oil and water displaced are collected through the liquid outlet pipe 22, and then a water injection displacement is started. The mixed phase of water and carbon dioxide is injected alternately to realize the oil displacement simulation experiment;

[0038] When the staff needs to observe the whole process, they can observe the displacement situation inside the tempered glass tube 2 through the corresponding visualization window 3 . If they need to observe the tempered glass tube 2 at the rear end, they can observe the reflective mirror 7 .

Claims

1. An indoor oil displacement test device for alternate injection of water and carbon dioxide, characterized in that: The invention comprises an outer cylinder (1), wherein a tempered glass tube (2) is arranged inside the outer cylinder (1), wherein the tempered glass tube (2) is filled with quartz sand for simulating formation rock, wherein both ends of the tempered glass tube (2) are sealedly connected to the outer cylinder (1), and the space between the tempered glass tube (2) and the outer cylinder (1) is filled with simulated formation water, and a plurality of visualization windows (3) are arranged on the outer wall of the outer cylinder (1) at equal intervals along the length direction of the outer cylinder, wherein the front end of the tempered glass tube (2) is connected to a three-way valve (4) via a first conduit (21), and the two ends of the three-way valve (4) are respectively connected to a high-pressure water injection tank (5) and a high-pressure gas injection tank (6) via a second conduit (41).

2. The indoor oil displacement test device for alternate injection of water and carbon dioxide according to claim 1, characterized in that: One end of a water injection pump (51) provided on the top of the high-pressure water injection tank (5) is connected to the corresponding second conduit (41), and the other end of the water injection pump (51) is connected to the front end of the outer cylinder (1) via a third conduit (52).

3. The indoor oil displacement test device for alternate injection of water and carbon dioxide according to claim 2, characterized in that: The gas injection pump (61) provided on the top of the high-pressure gas injection tank (6) is connected to the corresponding second conduit (41).

4. The indoor oil displacement test device for alternate injection of water and carbon dioxide according to claim 1, characterized in that: The visualization windows (3) are provided with a total of 6, and the visualization windows (3) are arranged in the form of arc segments embedded in the outer wall of the outer cylinder (1), and the arc of the visualization windows (3) is 90 to 120 degrees. The upper end of the visualization window located at the front end is located at the top of the outer cylinder (1), and the visualization window located on the left side is rotated 45 to 60 degrees clockwise from the central axis of the outer cylinder (1) compared to the visualization window on the right side.

5. The indoor oil displacement test device for alternate injection of water and carbon dioxide according to claim 4, characterized in that: A visualization window at the rear end is located at the bottom of the outer cylinder (1), and a reflective mirror (7) is provided on the bottom side and the top side corresponding to the visualization window (3). A fixing rod (71) is provided on the back side of the two reflective mirrors (7). The ends of the two fixing rods (71) are fixedly connected to a fixing ring (72), and the top of the fixing ring (72) is fixedly connected to the outer side wall of the top of the outer cylinder (1) via a connecting rod (73).

6. The indoor oil displacement test device for alternate injection of water and carbon dioxide according to claim 1, characterized in that: The rear end of the tempered glass tube (2) is provided with a liquid outlet pipe (22).

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