Oil reservoir development simulation experiment device

Abstract

The invention belongs to the technical field of oil reservoir development, and discloses an oil reservoir development simulation experiment device which comprises a device body, a partition plate, a displacement unit and an extraction unit. The device body is hollow to form a simulation cavity; the partition plate is arranged in the simulation cavity and divides the simulation cavity into a first cavity and a second cavity, and the first cavity and the second cavity are configured to contain experiment samples of different lithology; the displacement unit comprises a first injection assembly and a second injection assembly, and the first injection assembly is inserted into the first cavity; the second injection assembly is inserted into the second cavity; the extraction unit comprises a first extraction assembly and a second extraction assembly, the first extraction assembly communicates with the first cavity, and the second extraction assembly communicates with the second cavity. The oil reservoir development simulation experiment device can simulate the oil reservoir development process of overlapped areas of development layers with different lithology, and meanwhile experimental research on the inter-well communication condition and the inter-well interference condition is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil reservoir development, in particular to an oil reservoir development simulation experimental device. Background Art

[0002] With the increasing demand for energy, research on the development of buried hill reservoirs based on the theory of oil and gas exploration and development in rift basins has been carried out. Buried hill reservoirs are oil and gas reservoirs formed in various ancient terrain uplift traps under the unconformity surface of the formation.

[0003] After geological exploration, it was found that sandstone directly covered the buried hill without a stable mudstone interlayer. In the actual reservoir development process, the oil wells drilled on the sandstone and the reservoir wells drilled on the buried hill are connected to each other, and the two interfere with each other during the development process. There are differences in the underground structure and reservoir properties of different reservoir blocks. The specific methods of reservoir development in the sandstone and buried hill superimposed areas and the factors affecting reservoir development need to be studied in detail.

[0004] The above research experiments are generally not conducted directly in the oil field, but are simulated using indoor experiments. At present, for indoor experimental devices simulating the development of buried hill reservoirs, a long core holder experiment with multiple cores in parallel is generally used, and the cores are connected by switch valves. Since the flow in the pipeline is a linear flow, it is impossible to simulate the plane flow during the displacement process. Among them, the displacement process refers to the process of replacing the oil and gas in the formation with some external fluid, thereby moving the oil and gas to the bottom of the well. In addition, the above experimental device cannot study the inter-well connectivity and inter-well interference during the development of oil reservoirs in sandstone and buried hill superimposed areas.

[0005] Therefore, there is an urgent need for an oil reservoir development simulation experimental device to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide an oil reservoir development simulation experimental device, which can simulate the oil reservoir development process in the overlapping area of ​​development layers of different lithologies and realize experimental research on the well connectivity and well interference.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Reservoir development simulation experimental device, including:

[0009] A device body, wherein the device body is hollow to form a simulation cavity;

[0010] a partition, the partition being arranged in the simulation cavity to separate the simulation cavity into a first cavity and a second cavity, wherein the first cavity and the second cavity are configured to accommodate experimental samples of different lithologies;

[0011] A displacement unit, the displacement unit comprising a first injection assembly and a second injection assembly, the first injection assembly being inserted in the first cavity, the first injection assembly being configured to inject a displacement fluid into the first cavity; the second injection assembly being inserted in the second cavity, the second injection assembly being configured to inject a displacement fluid into the second cavity;

[0012] The extraction unit includes a first extraction component and a second extraction component, wherein the first extraction component is connected to the first cavity, and the second extraction component is connected to the second cavity.

[0013] As a preferred solution of the reservoir development simulation experimental device provided by the present invention, the device body includes a device base and a cover plate, the device base is provided with a groove, the space in the groove is the simulation cavity, and the cover plate is detachably sealed at the opening of the groove.

[0014] As a preferred embodiment of the reservoir development simulation experimental device provided by the present invention, the reservoir development simulation experimental device also includes a pressure unit, and the pressure unit includes a first pressure component and a second pressure component, the first pressure component is connected to the side of the device body, connected to the first cavity and the second cavity, and is configured to pump water into the sides of the first cavity and the second cavity; the second pressure component is connected to the bottom of the device body, connected to the second cavity, and is configured to pump water into the bottom of the second cavity.

[0015] As a preferred embodiment of the reservoir development simulation experimental device provided by the present invention, the reservoir development simulation experimental device also includes a filter unit, and the filter unit includes a first filter and a second filter, the first filter is arranged at the connecting position between the first pressure component and the first cavity and the connecting position between the first pressure component and the second cavity, and the second filter is arranged at the connecting position between the second pressure component and the second cavity.

[0016] As a preferred solution of the reservoir development simulation experimental device provided by the present invention, the displacement unit further includes a displacement pump, and the first injection assembly and the second injection assembly are both connected to the displacement pump.

[0017] As a preferred solution of the reservoir development simulation experimental device provided by the present invention, the first production assembly includes a first production wellbore and a first receiving structure, the first production wellbore is connected to the first receiving structure and the first cavity, and the first receiving structure is configured to receive the experimental fluid produced by the first production wellbore;

[0018] The second production assembly includes a second production wellbore and a second receiving structure, the second production wellbore is connected to the second receiving structure and the second cavity, and the second receiving structure is configured to receive the experimental fluid produced by the second production wellbore.

[0019] As a preferred solution of the reservoir development simulation experimental device provided by the present invention, the partition is a flat plate structure.

[0020] As a preferred solution of the reservoir development simulation experimental device provided by the present invention, the partition is provided with a first seepage flow hole, the unopened portion of the partition corresponds to the mudstone layer, and the position of the partition with the first seepage flow hole corresponds to the weathering leaching layer.

[0021] As a preferred embodiment of the reservoir development simulation experimental device provided by the present invention, the partition includes a first plate portion and a second plate portion connected to each other at an angle, one end of the first plate portion away from the second plate portion is connected to the side cavity wall of the simulation cavity, one end of the second plate portion away from the first plate portion is connected to the bottom cavity wall of the simulation cavity, and the second plate portion has a second seepage flow hole.

[0022] As a preferred embodiment of the reservoir development simulation experimental device provided by the present invention, the reservoir development simulation experimental device also includes a joint unit, and the joint unit includes multiple first joints, the first joints are arranged at the top of the device body, and the first injection assembly, the second injection assembly, the first production assembly and the second production assembly are respectively connected to the device body through one of the first joints.

[0023] Beneficial effects of the present invention:

[0024] The reservoir development simulation experimental device provided by the present invention includes a device body, a partition, a displacement unit and a production unit. The device body is hollow to form a simulation cavity. The partition is arranged in the simulation cavity to separate the simulation cavity into a first cavity and a second cavity, and the first cavity and the second cavity are configured to accommodate experimental samples of different lithologies. In other words, the partition setting of experimental samples of different lithologies can be achieved through the partition to simulate the azimuth relationship between sandstone and buried hill in actual conditions. The displacement unit includes a first injection assembly and a second injection assembly, the first injection assembly is inserted in the first cavity, and the first injection assembly is configured to inject displacement fluid into the first cavity; the second injection assembly is inserted in the second cavity, and the second injection assembly is configured to inject displacement fluid into the second cavity. The production unit includes a first production assembly and a second production assembly, the first production assembly is connected to the first cavity, and the second production assembly is connected to the second cavity. The first extraction component can be used to extract the oil in the experimental sample in the first cavity, and the second extraction component can be used to extract the oil in the experimental sample in the second cavity. In other words, the reservoir development simulation experimental device can simulate the reservoir development process in the overlapping area of ​​development layers of different lithologies, and simultaneously realize the experimental study of the well-to-well connectivity and well-to-well interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 is a cross-sectional view of an oil reservoir development simulation experimental device provided in Embodiment 1 of the present invention;

[0027] Figure 2 It is a partial cross-sectional view of the reservoir development simulation experimental device provided in the first embodiment of the present invention;

[0028] Figure 3 is a distribution diagram of the mudstone layer and the weathering leaching layer under actual conditions provided by the first embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of a partition provided in Embodiment 1 of the present invention;

[0030] Figure 5 is a schematic diagram of the arrangement of the sensor on the cover plate provided in the first embodiment of the present invention;

[0031] Figure 6 The structure of the partition provided in the second embodiment of the present invention is shown in FIG. Figure 1 ;

[0032] Figure 7 The structure of the partition provided in the second embodiment of the present invention is shown in FIG. Figure 2 ;

[0033] Figure 8 This is a schematic diagram of a situation in which a fault exists between sandstone and a buried hill in an actual situation provided by the third embodiment of the present invention;

[0034] Fig. 9 is a schematic diagram of the arrangement of the partition provided in the simulation cavity according to the third embodiment of the present invention;

[0035] Fig.10 It is a schematic diagram of the structure of the partition provided in Example 3 of the present invention.

[0036] In the figure:

[0037] 100, device body; 110, device base; 111, first cavity; 112, second cavity; 120, cover plate; 121, measuring probe;

[0038] 200, partition; 210, first seepage flow hole; 220, first plate portion; 230, second plate portion; 231, second seepage flow hole;

[0039] 300, displacement unit; 310, first injection assembly; 311, first injection pipe; 312, first injection valve; 313, first injection wellbore; 320, second injection assembly; 321, second injection pipe; 322, second injection valve; 323, second injection wellbore; 330, displacement pump;

[0040] 400, production unit; 410, first production assembly; 411, first production wellbore; 412, first receiving structure; 413, first production control valve; 420, second production assembly; 421, second production wellbore; 422, second receiving structure; 423, second production control valve;

[0041] 500, pressure unit; 510, first pressure assembly; 511, first constant pressure pump; 512, first control valve; 513, first connecting pipe; 520, second pressure assembly; 521, second constant pressure pump; 522, second control valve; 523, second connecting pipe;

[0042] 600, filter unit; 610, first filter; 620, second filter;

[0043] 700, connector unit; 710, first connector; 720, second connector; 730, third connector. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] Embodiment 1

[0050] Figure 1 A cross-sectional view of an oil reservoir development simulation experimental device provided in Embodiment 1 of the present invention is shown; Figure 2 A partial cross-sectional view of the reservoir development simulation experimental device provided by the first embodiment of the present invention is shown. Figure 1 and Figure 2 , this embodiment provides a reservoir development simulation experimental device. The reservoir development simulation experimental device includes a device body 100, a partition 200, a displacement unit 300 and a production unit 400. The device body 100 is hollow to form a simulation cavity. The partition 200 is arranged in the simulation cavity to separate the simulation cavity into a first cavity 111 and a second cavity 112, and the first cavity 111 and the second cavity 112 are configured to accommodate experimental samples of different lithologies. In this embodiment, experimental samples of different lithologies are compacted and arranged in the first cavity 111 and the second cavity 112, so that the properties of the experimental samples in the first cavity 111 are basically close to sandstone, and the properties of the experimental samples in the second cavity 112 are basically close to buried hills. The displacement unit 300 is connected to the simulation cavity and is configured to inject displacement fluid into the first cavity 111 and the second cavity 112. The production unit 400 is connected to the simulation cavity and is configured to extract experimental fluid from the first cavity 111 and the second cavity 112. In this embodiment, the experimental fluid is oil.

[0051] Specifically, the device body 100 includes a device base 110 and a cover plate 120. The device base 110 is provided with a groove, and the space in the groove is the simulation cavity. The cover plate 120 is detachably sealed at the opening of the groove by bolts. Through the cover plate 120, the experimental sample in the simulation cavity can be compacted to ensure the normal progress of the experimental process.

[0052] Continue to refer to Figure 1 and Figure 2 The displacement unit 300 includes a first injection assembly 310 and a second injection assembly 320. The first injection assembly 310 is inserted in the first cavity 111, and the first injection assembly 310 is configured to inject displacement fluid into the first cavity 111; the second injection assembly 320 is inserted in the second cavity 112, and the second injection assembly 320 is configured to inject displacement fluid into the second cavity 112.

[0053] Specifically, the displacement unit 300 further includes a displacement pump 330. The first injection assembly 310 and the second injection assembly 320 are both connected to the displacement pump 330. The displacement pump 330 is configured to provide the first injection assembly 310 and the second injection assembly 320 with a displacement fluid.

[0054] More specifically, the first injection assembly 310 includes a first injection pipe 311, a first injection valve 312, and a first injection wellbore 313. The first injection pipe 311 is connected between the displacement pump 330 and the first injection wellbore 313, and the first injection wellbore 313 is inserted in the experimental sample of the first cavity 111. The first injection valve 312 is arranged on the first injection pipe 311, and can control the opening and closing of the first injection pipe 311. Similarly, the second injection assembly 320 includes a second injection pipe 321, a second injection valve 322, and a second injection wellbore 323. The second injection pipe 321 is connected between the displacement pump 330 and the second injection wellbore 323, and the second injection wellbore 323 is inserted in the experimental sample of the second cavity 112. The second injection valve 322 is arranged on the second injection pipe 321, and can control the opening and closing of the second injection pipe 321.

[0055] Continue to refer to Figure 1 and Figure 2 The production unit 400 includes a first production component 410 and a second production component 420. The first production component 410 is connected to the first cavity 111, and the second production component 420 is connected to the second cavity 112. The first production component 410 can produce oil in the experimental sample of the first cavity 111, and the second production component 420 can produce oil in the experimental sample of the second cavity 112.

[0056] Specifically, the first production assembly 410 includes a first production wellbore 411 and a first receiving structure 412. The first production wellbore 411 is connected to the first receiving structure 412, and the first receiving structure 412 is configured to receive the experimental fluid produced by the first production wellbore 411. The first production wellbore 411 is inserted into the first cavity 111 and extends to the position above the partition 200. Similarly, the second production assembly 420 includes a second production wellbore 421 and a second receiving structure 422. The second production wellbore 421 is connected to the second receiving structure 422, and the second receiving structure 422 is configured to receive the experimental fluid produced by the second production wellbore 421. The second production wellbore 421 is inserted into the second cavity 112 and extends to the bottom position of the second cavity 112.

[0057] More specifically, the first production component 410 further includes a first production control valve 413. The first production control valve 413 is arranged in the connecting pipeline between the first production wellbore 411 and the first receiving structure 412, and is configured to control the connection and disconnection between the first production wellbore 411 and the first receiving structure 412. Similarly, the second production component 420 further includes a second production control valve 423. The second production control valve 423 is arranged in the connecting pipeline between the second production wellbore 421 and the second receiving structure 422, and is configured to control the connection and disconnection between the second production wellbore 421 and the second receiving structure 422.

[0058] More specifically, the first receiving structure 412 and the second receiving structure 422 both have a measuring function, and can respectively measure the volume of the experimental fluid produced by the first production wellbore 411 and the second production wellbore 421. In this embodiment, the first receiving structure 412 and the second receiving structure 422 can use graduated cylinders.

[0059] Figure 3 The distribution diagram of the mudstone layer and the weathering leaching layer under the actual situation provided by the first embodiment of the present invention is shown; Figure 4 The structure diagram of the partition provided by the first embodiment of the present invention is shown. Figure 3 In actual situations, there is an interlayer between the sandstone layer and the buried hill, on which there are mudstone layers and weathered leaching layers. The permeability of the mudstone layer is very low, and the weathered leaching layer is generally permeable. However, in actual situations, there are many layers of weathered leaching layers, so the permeable pores between each layer are staggered, resulting in low permeability of the weathered leaching layer. Therefore, referring to Figure 4 In this embodiment, the partition 200 is set as a flat plate structure. The flat plate-shaped partition 200 divides the simulation cavity into a first cavity 111 and a second cavity 112 stacked up and down along the height direction of the simulation cavity. In the actual experimental process, it is necessary to use glue to bond and seal the contact position of the partition 200 around the inner wall of the simulation cavity to prevent leakage from occurring at the connection between the partition 200 and the inner wall of the simulation cavity.

[0060] Specifically, the partition 200 is provided with a plurality of mounting holes, through which the first production wellbore 411, the second production wellbore 421, the first injection wellbore 313, and the second injection wellbore 323 can pass. Preferably, in order to prevent the experimental fluid or the displacement fluid from seeping out at the connection between the corresponding wellbore and the partition 200, in this embodiment, the wellbore and the partition 200 can be set as an integrated structure.

[0061] Figure 5 The schematic diagram of the arrangement of the sensor provided in the first embodiment of the present invention on the cover plate is shown. Figure 5 , a plurality of measuring probes 121 are arranged on the cover plate 120. The measuring probes 121 can measure the oil saturation changes of different experimental samples during the displacement process. It is a prior art, and its structure and principle are not described in detail in this embodiment.

[0062] Continue to refer to Figure 1 and Figure 2The reservoir development simulation experimental device also includes a pressure unit 500. The pressure unit 500 includes a first pressure assembly 510 and a second pressure assembly 520. The first pressure assembly 510 is connected to the side of the device body 100, connected to the first cavity 111 and the second cavity 112, and is configured to pump water to the side of the first cavity 111 and the second cavity 112 to simulate the edge water situation during the actual production process. The second pressure assembly 520 is connected to the bottom of the device body 100, connected to the second cavity 112, and is configured to pump water to the bottom of the second cavity 112 to simulate the bottom water situation during the actual production process.

[0063] Specifically, the first pressure assembly 510 includes a first constant pressure pump 511, a first control valve 512 and a first connecting pipe 513. The first constant pressure pump 511 is connected to the first connecting pipe 513, and the outlet of the first connecting pipe 513 has two branches, which are respectively connected to the side of the first cavity 111 and the side of the second cavity 112. The first control valve 512 is arranged in the first connecting pipe 513 and can control the opening and closing of the first connecting pipe 513.

[0064] More specifically, the second pressure assembly 520 includes a second constant pressure pump 521, a second control valve 522, and a second connecting pipe 523. The second constant pressure pump 521 is connected to the second connecting pipe 523, and the second connecting pipe 523 is connected to the bottom of the second cavity 112. The second control valve 522 is arranged in the second connecting pipe 523, and can control the on-off of the second connecting pipe 523.

[0065] As a preference, refer to Figure 1 and Figure 2 The reservoir development simulation experimental device also includes a filter unit 600. The filter unit 600 includes a first filter 610 and a second filter 620. The first filter 610 is arranged at the communication position between the first pressure assembly 510 and the first cavity 111 and the communication position between the first pressure assembly 510 and the second cavity 112. The second filter 620 is arranged at the communication position between the second pressure assembly 520 and the second cavity 112. The first filter 610 and the second filter 620 can make the edge water and bottom water pressures provided by the first constant pressure pump 511 and the second constant pressure pump 521 more uniform.

[0066] Preferably, the reservoir development simulation experimental device further includes a joint unit 700. The joint unit 700 includes a plurality of first joints 710, the first joints 710 are arranged at the top of the device body 100, and the first injection assembly 310, the second injection assembly 320, the first production assembly 410 and the second production assembly 420 are respectively connected to the device body 100 through one of the first joints 710. The joint unit 700 also includes a second joint 720 and a third joint 730, the second joint 720 is arranged at the side of the device body 100, and the third joint 730 is arranged at the bottom of the device body 100. The first connecting pipe 513 is connected to the side of the device body 100 through the second joint 720; the second connecting pipe 523 is connected to the bottom of the device body 100 through the third joint 730.

[0067] The reservoir development simulation experimental device provided in this embodiment uses a partition 200 to separate the simulation cavity into a first cavity 111 and a second cavity 112. The first cavity 111 and the second cavity 112 can be provided with rocks of different lithologies to simulate the geological conditions of the sandstone buried hill superimposed oil reservoir. The partition 200 is set as a flat plate structure to simulate the situation that the permeability of the weathered leaching layer is very low due to the large number of layers of the weathered leaching layer and the permeable holes between each layer are staggered under ideal conditions. The first constant pressure pump 511 and the second constant pressure pump 521 are set on the side and bottom of the device body 100 to simulate the existence of edge water and bottom water in the process of oil reservoir development. The first production wellbore 411, the second production wellbore 421, the first injection wellbore 313 and the second injection wellbore 323 are used to simulate the displacement process and oil production process of the sandstone buried hill superimposed oil reservoir geology under actual conditions.

[0068] Embodiment 2

[0069] This embodiment provides an oil reservoir development simulation experimental device. Figure 6 The structure of the partition provided by the second embodiment of the present invention is shown as follows Figure 1 ; Figure 7 The structure of the partition provided by the second embodiment of the present invention is shown as follows Figure 2 . Reference Figure 6 and Figure 7 The difference between this embodiment and the first embodiment lies in the structure of the partition 200.

[0070] Specifically, refer to Figure 6 ,according to Figure 3 The distribution of the mudstone layer and the weathered leaching layer in the actual situation is shown, and according to the principle of geometric similarity, the partition 200 has a first seepage hole 210, the unopened portion of the partition 200 corresponds to the mudstone layer, and the position of the partition 200 having the first seepage hole 210 corresponds to the weathered leaching layer.

[0071] More specifically, refer to Figure 7 Under actual geological conditions, the seepage effect of the weathered leaching layer is the Darcy seepage of the bedrock and the flow of the fractures. The design is based on the average permeability, but the overall average permeability is low. Therefore, in order to better simulate the seepage channel in the actual reservoir development process, in this embodiment, the first seepage flow hole 210 is set to be multiple, the first seepage flow hole 210 is circular, and the multiple first seepage flow holes 210 are opened according to a certain density. Through the above setting, the first seepage flow hole 210 and the surrounding partition 200 can simulate the heterogeneity under geological conditions and achieve a better simulation effect.

[0072] More specifically, in this embodiment, the displacement unit 300 may be provided with only one injection assembly, for example, only the first injection assembly 310. When the first seepage flow hole 210 is provided on the partition plate 200, during the saturated water process or the displacement process in the experiment, the first injection assembly 310 can be used to inject fluid such as water or displacement fluid into the first cavity 111, and the fluid in the first cavity 111 can penetrate into the second cavity 112 under the action of gravity.

[0073] The reservoir development simulation experimental device provided in this embodiment uses a partition 200 to separate the simulation cavity into a first cavity 111 and a second cavity 112. The first cavity 111 and the second cavity 112 can be provided with rocks of different lithology to simulate the geological conditions of the sandstone buried hill superimposed reservoir. The first seepage flow hole 210 provided on the partition 200 can simulate the seepage conditions under the conditions of uneven interlayers in the sandstone strata and the buried hill strata when the sandstone buried hill reservoir is jointly developed in the actual oil reservoir. The first production wellbore 411, the second production wellbore 421, the first injection wellbore 313 and the second injection wellbore 323 are used to simulate the displacement process and oil production process of the sandstone buried hill superimposed reservoir geology under actual conditions.

[0074] Embodiment 3

[0075] This embodiment provides an oil reservoir development simulation experimental device. Figure 8 A schematic diagram showing a situation where a fault exists between sandstone and buried hill in actual situation provided by the third embodiment of the present invention, Fig. 9 A schematic diagram showing the arrangement of the partition provided in the simulation cavity according to the third embodiment of the present invention is shown. Fig.10 The structure diagram of the partition provided by the third embodiment of the present invention is shown. Figure 8-Figure 10 The difference between this embodiment and the second embodiment lies in the structure of the partition 200.

[0076] according to Figure 8 In the actual situation, there is no direct contact between the sandstone and the buried hill. There are faults and unconformities between the two. The permeability of the fault is relatively low. In order to better simulate the permeability between the sandstone and the buried hill in this situation, the partition 200 is set to Fig.10 The structure shown.

[0077] Reference Fig. 9 and Fig.10 The partition 200 includes a first plate portion 220 and a second plate portion 230 connected at an angle to each other. One end of the first plate portion 220 away from the second plate portion 230 is connected to the side wall of the simulation cavity, and one end of the second plate portion 230 away from the first plate portion 220 is connected to the bottom wall of the simulation cavity. The second plate portion 230 is provided with a second seepage flow hole 231. There are multiple second seepage flow holes 231, and the arrangement density of the multiple second seepage flow holes 231 is low, and the aperture is small, which can simulate the lower permeability at the fault.

[0078] Preferably, glue is used to bond and seal the contact position between the first plate portion 220 and the cavity wall of the simulation cavity and the contact position between the second plate portion 230 and the cavity wall of the simulation cavity to prevent leakage between the first cavity 111 and the second cavity 112 .

[0079] The reservoir development simulation experimental device provided in this embodiment uses a partition 200 to separate the simulation cavity into a first cavity 111 and a second cavity 112. The first cavity 111 and the second cavity 112 can be provided with rocks of different lithology to simulate the geological conditions of the sandstone buried hill superimposed oil reservoir. The partition 200 is provided with a first plate portion 220 and a second plate portion 230 connected at an angle to simulate the situation that there are faults and unconformities between the sandstone and the buried hill in actual situations. The second seepage flow hole 231 opened in the second plate portion 230 can simulate the slight seepage in the sandstone strata and the buried hill strata when the sandstone buried hill oil reservoir is jointly developed in the actual oil reservoir. The first production wellbore 411, the second production wellbore 421, the first injection wellbore 313 and the second injection wellbore 323 are used to simulate the displacement process and oil production process of the sandstone buried hill superimposed oil reservoir geology in actual situations.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Oil reservoir development simulation experimental device, characterized in that: include: A device body (100), wherein the device body (100) is hollow to form a simulated cavity; a partition (200), the partition (200) being arranged in the simulation cavity to separate the simulation cavity into a first cavity (111) and a second cavity (112), wherein the first cavity (111) and the second cavity (112) are configured to accommodate experimental samples of different lithologies; A displacement unit (300), the displacement unit (300) comprising a first injection assembly (310) and a second injection assembly (320), the first injection assembly (310) being inserted into the first cavity (111), and the first injection assembly (310) being configured to inject a displacement fluid into the first cavity (111); the second injection assembly (320) being inserted into the second cavity (112), and the second injection assembly (320) being configured to inject a displacement fluid into the second cavity (112); The extraction unit (400) comprises a first extraction component (410) and a second extraction component (420), wherein the first extraction component (410) is connected to the first cavity (111), and the second extraction component (420) is connected to the second cavity (112).

2. The reservoir development simulation experimental device according to claim 1, characterized in that: The device body (100) comprises a device base (110) and a cover plate (120); the device base (110) is provided with a groove, the space in the groove is the simulation cavity, and the cover plate (120) is detachably sealed at the opening of the groove.

3. The reservoir development simulation experimental device according to claim 1, characterized in that: The reservoir development simulation experimental device also includes a pressure unit (500), and the pressure unit (500) includes a first pressure component (510) and a second pressure component (520), wherein the first pressure component (510) is connected to the side of the device body (100), connected to the first cavity (111) and the second cavity (112), and is configured to pump water to the sides of the first cavity (111) and the second cavity (112); the second pressure component (520) is connected to the bottom of the device body (100), connected to the second cavity (112), and is configured to pump water to the bottom of the second cavity (112).

4. The reservoir development simulation experimental device according to claim 3, characterized in that: The reservoir development simulation experimental device also includes a filter unit (600), and the filter unit (600) includes a first filter (610) and a second filter (620), the first filter (610) is arranged at a communication position between the first pressure component (510) and the first cavity (111) and a communication position between the first pressure component (510) and the second cavity (112), and the second filter (620) is arranged at a communication position between the second pressure component (520) and the second cavity (112).

5. The reservoir development simulation experimental device according to claim 1, characterized in that: The displacement unit (300) further comprises a displacement pump (330), and the first injection assembly (310) and the second injection assembly (320) are both connected to the displacement pump (330).

6. The reservoir development simulation experimental device according to claim 1, characterized in that: The first production assembly (410) comprises a first production wellbore (411) and a first receiving structure (412), wherein the first production wellbore (411) is connected to the first receiving structure (412) and the first cavity (111), and the first receiving structure (412) is configured to receive the experimental fluid produced by the first production wellbore (411); The second production assembly (420) includes a second production wellbore (421) and a second receiving structure (422), wherein the second production wellbore (421) connects the second receiving structure (422) and the second cavity (112), and the second receiving structure (422) is configured to receive the experimental fluid produced by the second production wellbore (421).

7. The reservoir development simulation experimental device according to any one of claims 1 to 6, characterized in that: The partition (200) is a flat plate structure.

8. The reservoir development simulation experimental device according to claim 7, characterized in that: The partition (200) is provided with a first seepage hole (210), the portion of the partition (200) where no hole is provided corresponds to a mudstone layer, and the position of the partition (200) where the first seepage hole (210) is provided corresponds to a weathering leaching layer.

9. The reservoir development simulation experimental device according to any one of claims 1 to 6, characterized in that: The partition (200) includes a first plate portion (220) and a second plate portion (230) connected to each other at an angle, wherein one end of the first plate portion (220) away from the second plate portion (230) is connected to the side cavity wall of the simulation cavity, and one end of the second plate portion (230) away from the first plate portion (220) is connected to the bottom cavity wall of the simulation cavity, and the second plate portion (230) is provided with a second seepage flow hole (231).

10. The reservoir development simulation experimental device according to claim 1, characterized in that: The reservoir development simulation experimental device also includes a joint unit (700), and the joint unit (700) includes a plurality of first joints (710). The first joints (710) are arranged at the top of the device body (100), and the first injection assembly (310), the second injection assembly (320), the first production assembly (410) and the second production assembly (420) are respectively connected to the device body (100) via one of the first joints (710).

Images