CN107829715B - Test device and method for simulating oil reservoir water injection - Google Patents

Abstract

The application provides a test device and a method for simulating oil reservoir water injection, wherein the device comprises: the device comprises a test box, an input pipe column, a water injection mechanism, an output pipe column, a back pressure mechanism and a monitoring mechanism. The test box is filled with sand and the sand in the test box is saturated with petroleum. The input pipe column is accommodated in the test box, and water with pressure is input into the test box to displace oil in the test box. The water injection mechanism is connected with the input pipe column and is used for injecting water into the input pipe column. The output pipe column is accommodated in the test box and is used for outputting the petroleum in the test box. The back pressure mechanism is used for pressurizing the output pipe column so as to control the outflow speed of the oil. The monitoring mechanism is used for monitoring the effect of water injection and oil displacement in the test box. The test device and the method can simulate the general water injection and the separated layer water injection of the oil reservoir, compare the swept volume and the oil displacement efficiency of the two, and compare the pressure and flow data in unit time, and can research the development effect of different water injection forms on the heterogeneous oil reservoir.

Description

Test device and method for simulating oil reservoir water injection

Technical Field

The application belongs to the technical field of oil exploitation, and particularly relates to a test device and method for simulating oil reservoir water injection.

Background

In the actual oil reservoir development process, the oil reservoir often has heterogeneity, the later stage of the oil reservoir needs energy supplement to meet the oil reservoir development, and water injection is widely applied as a common technical means. When heterogeneous oil reservoirs are developed by water flooding, water channeling is often a problem due to differences in permeability. The injection amount of water in the high-permeability area and the low-permeability area can be controlled by layered water injection, and during water injection, the injection allocation amount of the high-permeability area is reduced, so that the sudden water inflow can be reduced, the injection allocation amount of the low-permeability area is increased, the flow rate of water in the low-permeability area is increased, and the problem of water channeling of a heterogeneous oil reservoir can be effectively relieved.

Chinese utility model patent CN205135585U provides a stratified water injection simulation experiment device, and this experiment device includes: the device comprises a plurality of visual sleeve simulation devices, a simulation main oil pipe, a liquid pump, a liquid storage system, a simulation porthole, a smooth valve, a pitching pipeline, a pitching valve, a pitching front-stop valve and a pitching rear-stop valve which are sequentially connected end to end in series. The liquid storage system is connected with an inlet of the liquid pump, each simulation oil distribution pipe is connected with the liquid storage system through a simulation oil distribution pipe loop valve and a simulation oil distribution pipe flowmeter, the simulation blastholes are located in each visual sleeve simulation device and located on the side wall of the simulation sleeve, the smooth valve is arranged between the simulation main oil pipe loop valve and the liquid pump, and the ball throwing valve is arranged on the ball throwing pipeline. However, the experimental device mainly focuses on simulating zonal injection of a shaft part, and does not consider the influence on an oil reservoir part, particularly the influence on the development of a heterogeneous oil reservoir.

At present, no indoor test device and method for water injection of heterogeneous oil reservoirs exist.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a test device and a method for simulating reservoir water injection, which can simulate the influence of layered water injection and cage water injection on the development of a heterogeneous reservoir and provide experimental guidance for the actual reservoir production on site.

The specific technical scheme of the invention is as follows:

the invention provides a test device for simulating oil reservoir water injection, which comprises:

a test chamber containing sand, the sand in the test chamber being saturated with petroleum;

the input pipe column is accommodated in the test box and is used for inputting water with pressure into the test box so as to displace oil in the test box;

the water injection mechanism is connected with the input pipe column and is used for injecting water into the input pipe column;

an output string housed in the test box for outputting the oil in the test box;

a back pressure mechanism for pressurizing the inside of the output string to control the outflow rate of the oil;

and the monitoring mechanism is used for monitoring the effect of water injection and oil displacement in the test box.

In one embodiment, the water injection mechanism comprises a first water injection mechanism and a second water injection mechanism arranged in parallel;

the first water injection mechanism comprises a first water injection tank body and a first liquid tank, a first piston is arranged in the first water injection tank body, the first piston divides the first water injection tank body into a first part and a second part, water is contained in the first part and is communicated with the input pipe column, and the second part is communicated with the first liquid tank through a first pump;

the second water injection mechanism comprises a second water injection tank body and a second liquid tank, a second piston is arranged in the second water injection tank body and divides the second water injection tank body into a third part and a fourth part, water is contained in the third part and communicated with the input pipe column, and the fourth part is communicated with the second liquid tank through a second pump.

In one embodiment, the water injection mechanism further comprises a gas cylinder in communication with the first and third portions, respectively.

In one embodiment, the input string and the output string are selected from any one of a segmented completion simulation string and a general completion simulation string.

In one embodiment, the segmented completion simulation string comprises:

the first oil pipe is provided with a plurality of first through holes;

the second oil pipe is sleeved in the first oil pipe, a plurality of second through holes are formed in the second oil pipe, and the second through holes are communicated with the first through holes;

the simulation packer divides the first oil pipe into an upper part and a lower part, is connected to the lower part of the second oil pipe and is in sealing connection with the first oil pipe, one end of the simulation packer is communicated with the second oil pipe, and the other end of the simulation packer is communicated with the first oil pipe;

the flow divider is provided with a first opening, a second opening and a third opening opposite to the first opening, the third opening is connected with the first oil pipe, the second oil pipe is connected with the first opening and sleeved in the first oil pipe after penetrating out of the third opening, so that the second opening is communicated with the first oil pipe.

In one embodiment, the general completion simulation string comprises:

the first oil pipe is provided with a plurality of first through holes;

the flow divider is provided with a first opening, a second opening and a third opening opposite to the first opening, and the first oil pipe is connected with the third opening so that the first opening and the second opening are communicated with the first oil pipe.

In one embodiment, the test device for simulating reservoir water injection further comprises an oil-water separator connected with the output pipe column, and an oil storage container and a water storage container connected with the oil-water separator.

In one embodiment, the monitoring mechanism includes a camera for real-time monitoring of the test chamber, and a pressure processor for pressure monitoring of the test device and a flow processor for flow monitoring of the test device.

In one embodiment, the back pressure mechanism comprises a back pressure pump, and a back pressure valve is arranged between the back pressure pump and the output pipe column.

In addition, the application also provides a test method of the test device for simulating oil reservoir water injection, which comprises the following steps:

starting the water injection mechanism and the back pressure mechanism to enable water in the first water injection box body and/or the second water injection box body to flow into the input pipe column;

the input pipe column guides water into the test box to displace oil in the test box into the output pipe column;

the output pipe column guides the petroleum in the test box into an oil-water separator for oil-water separation, guides the separated oil into an oil storage container, guides the separated water into a water storage container, measures the weight of the oil in the oil storage container, and calculates the oil displacement efficiency;

and the monitoring mechanism monitors the swept volume of the water flooding oil in the test box in real time, and the pressure and flow of oil and/or water in each pipeline in unit time.

In one embodiment, the input string and the output string are selected from any one of a segmented completion simulation string and a general completion simulation string.

Borrow by above technical scheme, the beneficial effect of this application lies in: the test device and the method for simulating the water injection of the oil reservoir can perform a general water injection test and a layered water injection test of the simulated oil reservoir, then compare swept volumes and oil displacement efficiency of the two tests, and pressure and flow data in unit time, and can research the development effect of different water injection forms on the heterogeneous oil reservoir.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for assisting the understanding of the present application, and are not particularly limited to the shapes, the proportional sizes, and the like of the respective members in the present application. Those skilled in the art, having the benefit of the teachings of this application, may select various possible shapes and proportional sizes to implement the present application, depending on the particular situation. In the drawings:

FIG. 1 is a schematic structural diagram of a test device for simulating reservoir flooding according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a segmented completion simulation string in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of a general completion simulation string in accordance with an embodiment of the present application;

FIG. 4 is a front view of a test chamber according to an embodiment of the present application;

fig. 5 is a side view of a test chamber according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in FIG. 1, the invention provides a test device for simulating reservoir waterflood, comprising: test box 22, input tubular column, water injection mechanism, output tubular column, back pressure mechanism, and monitoring mechanism. The test chamber 22 contains sand which saturates the petroleum in the test chamber 22. An input string is housed in the test chamber 22 which inputs water under pressure into the test chamber 22 to displace the oil in the test chamber 22. And the water injection mechanism is connected with the input pipe column and is used for injecting water into the input pipe column. An output string is received in the test chamber 22 for outputting the oil in the test chamber 22. And the back pressure mechanism is used for pressurizing the output pipe column so as to control the outflow speed of the oil. The monitoring mechanism is used for monitoring the effect of water injection and oil displacement in the test box 22.

When the test device for simulating oil reservoir water injection is used, firstly, sandstone and saturated petroleum are filled in the test box 22, and then, a water injection mechanism is started to inject water into the input pipe column so as to displace the petroleum in the test box 22 and enter the output pipe column. In the process of water injection and oil displacement, a back pressure mechanism is required to be started to apply certain pressure to the output pipe column so as to control the flow speed of the petroleum flowing out of the output pipe column. The oil flowing out of the output pipe column can be recovered, and then the recovered oil is weighed to calculate the efficiency of water injection and oil displacement. Meanwhile, when water injection and oil displacement are carried out, a monitoring mechanism is required to be started to monitor and analyze the pressure and flow in each pipeline in the water displacement and oil displacement process, and the swept volume of the water displacement and oil displacement can be recorded through the monitoring mechanism.

In this embodiment, referring to fig. 4 and 5, the test chamber 22 is generally a rectangular parallelepiped structure, one side of which may be made of tempered glass 59, and the remainder of which may be generally sealed by a metal plate 58. Wherein the face made of tempered glass 59 is used to facilitate real-time monitoring by the monitoring mechanism. The lower sand in the test chamber 22 is typically filled with sand of a larger particle size and the upper sand is typically filled with sand of a smaller particle size. Of course, those skilled in the art can place sand with smaller particle size on the lower part and sand with larger particle size on the upper part according to actual needs, or perform multi-layer sand filling according to test needs, which is not limited in this application. After the test chamber 22 is filled with sand, the test chamber 22 may be filled with oil, preferably saturated with sand, to simulate the actual condition of the oil in the formation.

The input string may be housed in a test chamber 22, which is used to simulate a water injection string in an actual production process. Through which water may be injected into test chamber 22 to effect displacement of oil from test chamber 22. Because the water injection and oil displacement can be separated layer water injection or general water injection in the actual production process. Therefore, when the reservoir water injection test is simulated, the input string can also select the segmented completion simulation string 10 to simulate the segmented water injection, and can also select the general completion simulation string 20 to perform the general water injection, and a person skilled in the art can select the input string according to the test requirement, and the application does not limit the input string.

Similarly, the output string may be selected from any one of the segmented completion simulation string 10 and the general completion simulation string 20. And the output string may also be housed in test chamber 22 for conducting water-displaced oil out of test chamber 22.

In order to ensure that the flow rate of the oil led out of the test chamber 22 during the test is smooth, a back pressure mechanism can be arranged in the test device. The back pressure mechanism generally comprises a back pressure pump 41, and a back pressure valve 42 and a back pressure gauge 43 can be arranged between the back pressure pump 41 and the output pipe column. During the test, the back-pressure valve 42 can be opened, and the back-pressure pump 41 can apply a certain pressure to the output pipe column, wherein the pressure is generally matched with the water injection pressure in the input pipe column, so that the phenomenon that the pressure difference between the input pipe column and the output pipe column is too large and water channeling is formed in the test box 22 is prevented.

The water injection mechanism can be connected with the input pipe column and used for injecting water into the input pipe column. In general, the water injection mechanism may include a first water injection mechanism and a second water injection mechanism disposed in parallel. The first water injection mechanism and the second water injection mechanism can be opened simultaneously or respectively for water injection. For example, in the case of performing the stratified water injection test, the first water injection mechanism and the second water injection mechanism may be simultaneously opened to inject water into the lower part of the oil layer by the first water injection mechanism and inject water into the upper part of the oil layer by the second water injection mechanism. If the water is injected into the input pipe column in a general mode, the first water injection mechanism or the second water injection mechanism can be independently started to inject water into the input pipe column.

Further, the first water injection mechanism may include a first water injection tank body 5 and a first liquid tank 1. A first piston may be disposed in the first water injection tank body 5, the first piston divides the first water injection tank body 5 into a first portion and a second portion, the first portion contains water and is communicated with the input pipe column, and the second portion is communicated with the first liquid tank 1 through a first pump 2. And a first pressure gauge 3, a first inlet valve 51 and a first drain valve 52 can be further included between the first pump 2 and the first water injection tank 5. A first outlet valve 6, a second pressure gauge 7, a first liquid flow control valve 8 and a first one-way valve 9 can be further arranged between the first water injection box body 5 and the input pipe column.

Similarly, the second water injection mechanism may include a second water injection tank body 15 and a second liquid tank 11, a second piston is disposed in the second water injection tank body 15, the second piston divides the second water injection tank body 15 into a third portion and a fourth portion, water is disposed in the third portion and communicated with the input pipe string, and the fourth portion is communicated with the second liquid tank 11 through a second pump 12. And a third pressure gauge 13, a second inlet valve 61, and a second drain valve 62 may be further included between the second pump 12 and the second filling tank 15. A second outlet valve 16, a fourth pressure gauge 17, a second flow control valve 18 and a second one-way valve 19 may also be included between the second watering box 15 and the input string.

In a preferred embodiment, the water injection mechanism may further comprise a gas cylinder 23, said gas cylinder 23 being in communication with said first and third parts, respectively. In order to ensure that the first piston in the first water injection tank 5 and the second piston in the second water injection tank 15 are reset after the test is finished for the next test, the air bottle 23 can be used for pressurizing the first part of the first water injection tank 5 and the third part of the second water injection tank 15, so that the first piston and the second piston respectively move towards the second part and the fourth part, and enough space is left in the first part and the third part for adding water again. It should be noted that a gas cylinder pressure gauge 24, a gas pressure control valve 25, a gas pressure gauge 26, a first gas inflow valve 27, and a gas leakage valve 60 may be included between the gas cylinder 23 and the first water injection tank 5. A cylinder pressure gauge 24, a gas pressure control valve 25, a gas pressure gauge 26, and a second gas inflow valve 28 may be included between the cylinder 23 and the second water injection tank 15.

Further, if the reservoir layered water injection is simulated, the input string can select the segmented well completion simulation string 10, and if the reservoir layered water injection is simulated, the cage water injection simulation string 20 can be adopted. Similarly, if the layered oil extraction is simulated, the segmented well completion simulation pipe column 10 can be selected, and if the general oil extraction is simulated, the general water injection simulation pipe column 20 can be adopted. The combination can be freely performed by those skilled in the art according to the requirements of practical experiments, and the application does not limit the invention.

As shown in fig. 2, the input string in this test may be a staged completion simulation string 10, for example, to simulate zonal injection. The pipe string may include: first tubing 55, second tubing 56, simulation packer 57, and diverter 54. Specifically, the first oil pipe 55 may be provided with a plurality of first through holes. The second oil pipe 56 is sleeved in the first oil pipe 55, and a plurality of second through holes can be formed in the second oil pipe 56 and are communicated with the first through holes. The first oil pipe 55 is divided into an upper part and a lower part (taking the distribution of the particle size of sand as a limit) by a simulation packer 57, the simulation packer 57 is connected to the lower part of the second oil pipe 56 and is in sealing connection with the inner wall of the first oil pipe 55, the upper end of the simulation packer 57 is communicated with the second oil pipe 56, and the lower end of the simulation packer 57 is communicated with the first oil pipe 55. Preferably, the simulated packer 57 may have a protrusion thereon, and the first tubing 55 may be divided into upper and lower sections, and the upper and lower sections of the first tubing 55 may be snap-sealed with the protrusion on the simulated packer 57.

The flow diverter 54 has an internal cavity, said flow diverter 54 having a first opening 49, a second opening 50, and a third opening 53 disposed opposite said first opening 49. Wherein the first opening 49 and the second opening 50 may be provided on a top cover of the flow splitter 54 and the third opening 53 may be provided on a bottom cover of the flow splitter. The first opening 49 may communicate with a first portion of the first water injection tank 5, and the second opening 50 may communicate with a third portion of the second tank 15. The first oil pipe 55 is connected with the third opening 53, and the second oil pipe 56 is connected with the first opening 49, penetrates out of the third opening 53 and then is sleeved in the first oil pipe 55, so that the second opening 50 is communicated with the first oil pipe 55. Thus, when the segmented completion simulation string 10 is used for separate zone water injection, the first fluid tank 1 and the second fluid tank 11 can be opened simultaneously, so that the fluid in the first fluid tank 1 flows into the second part of the first water injection tank body 5, and the first piston is pushed to slide towards the first part, so that the water in the first part flows into the lower part of the first oil pipe 55 through the first opening 49 of the flow divider 54, the second oil pipe 56 and the simulation packer 57, and is injected into the lower sand of the test box 22 through the first through hole on the first oil pipe 55 to displace oil. Similarly, the liquid in the second liquid tank 11 flows into the fourth section of the second water injection tank body 15 and pushes the second piston to slide towards the third section, so that the water in the third section flows into the upper part of the first oil pipe 55 through the second opening 50 and the third opening 53 of the flow divider 54 and is injected into the upper sand of the test chamber 22 through the first through hole on the first oil pipe 55 to displace the oil.

As shown in fig. 3, a general completion simulation string 20 is described by way of example of a general waterflood. The general completion simulation string 20 may include: a first oil line 55 and a flow splitter 54. The specific structure of the first oil pipe 55 and the flow divider 54 is the same as above, and the description thereof is omitted here. It is emphasized that in performing the conventional flooding test, the first and second flooding boxes 5 and 15 may be opened simultaneously to simultaneously flood the conventional completion simulation string 20 with water using the first and second openings 49 and 50 of the flow diverter 54. It is also possible to open only the first injection box 5 and inject water into the first opening 49 of the flow diverter 54, and it is of course also possible to open only the second injection box 15 and inject water into the general completion simulation string 20 using the second opening 50 of the flow diverter 54. Similarly, the output string may be any one of the segmented completion simulation string 10 and the general completion simulation string 20, and the principle is similar, which is not repeated herein.

In another preferred embodiment, the outlet string may be connected to the oil-water separator 36 through the outlet control valve 30. The number of the oil-water separator 36 may be one, or the number of the oil-water separator 36 may be two. If the production string employs the conventional completion simulation string 20, a single oil-water separator 36 is typically used. If the production string employs the staged completion simulation string 10, two oil water separators 36 may be employed. The two oil water separators 36 may be connected to the first opening 49 and the second opening 50 of the flow divider 54, respectively, and thus communicate with the upper and lower layers of the test chamber 22, respectively. The oil separated by the oil-water separator 36 may be collected using an oil storage container 39, and the water may be collected using a water storage container 40, and the flow rates of the oil and water may be measured by the flow meter 33 while collecting the oil and water.

Further, the monitoring mechanism may include a camera 47 that images the test chamber 22. The camera 47 can monitor the swept volume of the water flooding in the test chamber 22 at any time. For example, the test chamber 22 may be filled with colored water, and the camera 47 may record the swept volume of the colored water in real time and compare the swept volume for each test. The monitoring mechanism can also comprise a pressure processor 45 for monitoring the pressure of the water or the oil in each pipeline in the testing device and a flow processor 46 for monitoring the flow of the water or the oil in the pipeline, and the pressure processor 45 and the flow processor reflect the pressure of the water or the oil in the pipeline in real time in an information acquisition device 48 for displaying. The pressure and flow data of water and oil in different test modes can be compared and analyzed in the same time in the test process.

It should be noted that the pump, valve, etc. provided in this embodiment may be any suitable existing configuration. For clearly and briefly explaining the technical solution provided by the present embodiment, the above parts will not be described again, and the drawings in the specification are also simplified accordingly. It should be understood, however, that the present embodiments are not limited in scope thereby.

In addition, the invention also provides a test method of the test device for reservoir water injection, which comprises the following steps.

S1: and starting the water injection mechanism and the back pressure mechanism to enable water in the first water injection box body 5 and/or the second water injection box body 15 to flow into the input pipe column.

S2: the input string directs water into the test chamber 22 to displace oil in the test chamber 22 into the output string.

S3: the output pipe column guides the petroleum in the test box 22 into an oil-water separator 36 for oil-water separation, guides the separated oil into an oil storage container 39, guides the separated water into a water storage container 40, measures the weight of the oil in the oil storage container 39, and calculates the oil displacement efficiency.

S4: the monitoring mechanism monitors the swept volume of the displacement of water in the test chamber 22 in real time, as well as the pressure and flow rate of oil and/or water in each line per unit time.

In this test method, the input string and the output string may be selected as appropriate for the test, and as described above, the input string and the output string may be selected from any one of the segmented completion simulation string 10 and the general completion simulation string 20.

The test device and the method for simulating the water injection of the oil reservoir can perform a general water injection test and a layered water injection test of the simulated oil reservoir, and then compare the swept volume and the oil displacement efficiency of the two tests and pressure and flow data in unit time, so that the development effect of different water injection forms on the heterogeneous oil reservoir can be researched.

The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.

Claims (8)

1. The utility model provides a test device of simulation oil reservoir water injection which characterized in that includes:

a test chamber containing sand, the sand in the test chamber being saturated with petroleum;

the input pipe column is accommodated in the test box and is used for inputting water with pressure into the test box so as to displace oil in the test box;

the water injection mechanism is connected with the input pipe column and is used for injecting water into the input pipe column;

an output string housed in the test box for outputting the oil in the test box;

a back pressure mechanism for pressurizing the inside of the output string to control the outflow rate of the oil;

the monitoring mechanism is used for monitoring the effect of water injection and oil displacement in the test box;

the input string and the output string are selected from a segmented completion simulation string;

the segmented completion simulation string comprises:

the first oil pipe is provided with a plurality of first through holes;

the second oil pipe is sleeved in the first oil pipe, a plurality of second through holes are formed in the second oil pipe, and the second through holes are communicated with the first through holes;

the simulation packer divides the first oil pipe into an upper part and a lower part, is connected to the lower part of the second oil pipe and is in sealing connection with the first oil pipe, one end of the simulation packer is communicated with the second oil pipe, and the other end of the simulation packer is communicated with the first oil pipe;

the flow divider is provided with a first opening, a second opening and a third opening opposite to the first opening, the third opening is connected with the first oil pipe, the second oil pipe is connected with the first opening and sleeved in the first oil pipe after penetrating out of the third opening, so that the second opening is communicated with the first oil pipe.

2. The test device for simulating reservoir waterflooding according to claim 1, wherein the waterflooding mechanism comprises a first waterflooding mechanism and a second waterflooding mechanism which are arranged in parallel;

the first water injection mechanism comprises a first water injection tank body and a first liquid tank, a first piston is arranged in the first water injection tank body, the first piston divides the first water injection tank body into a first part and a second part, water is contained in the first part and is communicated with the input pipe column, and the second part is communicated with the first liquid tank through a first pump;

the second water injection mechanism comprises a second water injection tank body and a second liquid tank, a second piston is arranged in the second water injection tank body and divides the second water injection tank body into a third part and a fourth part, water is contained in the third part and communicated with the input pipe column, and the fourth part is communicated with the second liquid tank through a second pump.

3. The test device for simulating reservoir waterflooding according to claim 2, wherein the waterflooding mechanism further comprises gas cylinders respectively communicating with the first portion and the third portion.

4. The test device for simulating reservoir waterflooding as claimed in claim 2, further comprising an oil-water separator connected to the output string, and an oil reservoir and a water reservoir connected to the oil-water separator.

5. The test rig for simulating reservoir waterflooding of claim 1, wherein the monitoring mechanism includes a camera for real-time monitoring of the test chamber, and a pressure processor for pressure monitoring of the test rig and a flow processor for flow monitoring of the test rig.

6. The test device for simulating reservoir flooding according to claim 1, wherein the back pressure mechanism comprises a back pressure pump, and a back pressure valve is arranged between the back pressure pump and the output pipe column.

7. The testing method of the testing device for simulating reservoir waterflood as claimed in claim 4, comprising:

starting the water injection mechanism and the back pressure mechanism to enable water in the first water injection box body and/or the second water injection box body to flow into the input pipe column;

the input pipe column guides water into the test box to displace oil in the test box into the output pipe column;

the output pipe column guides the petroleum in the test box into an oil-water separator for oil-water separation, guides the separated oil into an oil storage container, guides the separated water into a water storage container, measures the weight of the oil in the oil storage container, and calculates the oil displacement efficiency;

and the monitoring mechanism monitors the swept volume of the water flooding oil in the test box in real time, and the pressure and flow of oil and/or water in each pipeline in unit time.

8. The testing method of claim 7, wherein the input string and the output string are selected from a segmented completion simulation string.

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