High-temperature and high-pressure imbibition instrument

Abstract

The invention discloses a high-temperature and high-pressure imbibition instrument, which belongs to the technical field of experimental equipment, and comprises a kettle body structure, an observation interval is defined in the shell structure, at least part of the side wall of the shell structure is made of a transparent material, and the observation interval is communicated with the placement interval through the dialysis channel; and an injection assembly. The dialysis instrument composed of the kettle body structure, the shell structure and the injection assembly is arranged, a placement interval limited in the kettle body structure serves as a dialysis replacement interval of a rock core sample and dialysate, simulation of high-temperature and high-pressure environments can be achieved, and by means of the communication design of a dialysis channel and an observation interval on the kettle body structure, the dialysis efficiency is improved. And the dialysate replaced by dialysis can flow to the observation interval, so that the experiment process and result can be observed.

Description

Technical Field

[0001] The present invention belongs to the technical field of experimental equipment, and particularly relates to a high-temperature and high-pressure imbibition instrument. Background Art

[0002] With the in-depth development of conventional oil resources worldwide, the efficient development and utilization of unconventional oil and gas resources, with tight / shale oil as an important component, have gradually become the focus and difficulty of research. Accelerating the exploration and development of tight / shale oil has a demonstrative effect on the breakthrough of continental unconventional oil and gas resources in China. Compared with conventional oil reservoirs, the matrix overburden permeability of tight / shale oil reservoirs is generally less than 0.1×10 -3 μm 2 , and at the present stage, the large-scale volume fracturing technology for horizontal wells is the basic means for its industrial development. Different from the pressure difference displacement oil production in the matrix of conventional oil reservoirs, after large-scale volume fracturing transformation of such reservoirs, the injected water mainly flows along the fractures in the dual-medium system of matrix-high permeability fractures, and it is difficult to form effective displacement in the matrix. The capillary imbibition between the fracture-matrix system is the main mechanism for the mobilization of crude oil in the matrix of such oil reservoirs.

[0003] Currently, the experimental research on the imbibition displacement law of tight shale cores mainly focuses on imbibition displacement under normal pressure (i.e., spontaneous imbibition), without considering imbibition displacement under the influence of external fluid pressure (i.e., pressure-assisted imbibition), and the dialysis process cannot be well observed during the experiment. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature and high-pressure imbibition instrument to solve the limitations of the dialysis instrument in the use process as mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A high-temperature and high-pressure imbibition instrument, comprising:

[0006] A kettle body structure, which defines a placement interval for accommodating a core sample therein, and has a dialysis channel for the replacement dialysis fluid to flow out. The dialysis channel has a dialysis port extending into the placement interval, and the dialysis port is configured to be closed by the core sample;

[0007] A housing structure, which defines an observation interval therein, and at least part of the side wall of the housing member is made of a transparent material. The observation interval is communicated with the placement interval through the dialysis channel;

[0008] An injection assembly, including at least one flow path unit. A single flow path unit has an inflow section and an outflow section that are fluidly connected to the placement interval. The dialysis fluid enters the placement interval through the inflow section and is discharged through the outflow section.

[0009] Preferably, the imbibition instrument further includes:

[0010] A clamping structure is assembled within the placement interval and configured to hold the core sample in a set position.

[0011] Preferably, the core sample is configured to be held suspended under the action of the clamping structure.

[0012] Preferably, the dialysis port is configured as an inverted conical port.

[0013] Preferably, the housing structure includes:

[0014] An outer shell member is assembled at the top of the kettle body structure, and an installation interval extending in a first direction is defined therein, and at least part of the side wall of the outer shell member is configured as a visible window;

[0015] An inner shell member is assembled within the installation interval and is made of a transparent material, and the internal interval of the inner shell member is configured as the observation interval.

[0016] Preferably, the dialysis instrument further includes:

[0017] End plate members are assembled on the outer shell member and located outside the visible window, and there are openings on both of the end plate members.

[0018] Preferably, the dialysis instrument further includes an image component, and the image component includes:

[0019] A camera member configured to acquire image and / or video information of the observation interval.

[0020] Preferably, the image component further includes:

[0021] A light source member configured to emit light towards the observation interval.

[0022] Preferably, a pump body and a container component are provided on the inflow section of the flow path unit, and a dialysis solution is stored in the container component.

[0023] Preferably, the kettle body structure includes:

[0024] A kettle body member, within which an interval with one end open is defined;

[0025] A base member is detachably installed at the open end of the kettle body member to close the opening to form the placement interval.

[0026] Preferably, the dialysis instrument further includes:

[0027] A heating component configured to heat the kettle body structure so that the temperature of the placement interval reaches a set value and is maintained.

[0028] Preferably, the dialysis instrument further includes:

[0029] The monitoring pipeline is fluidly connected to the observation interval and includes a drainage branch, a sampling branch, and a pressure branch.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] In this application, a dialysis instrument composed of a kettle body structure, a housing structure, and an injection assembly is provided. By using the placement interval defined within the kettle body structure as the dialysis replacement interval for the core sample and the dialysis fluid, it is possible to simulate high-temperature and high-pressure environments. Through the connection design between the dialysis channel on the kettle body structure and the observation interval, the dialysis fluid displaced by dialysis can flow to the observation interval, enabling the observation of the experimental process and results. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the dialysis instrument;

[0033] Figure 2 It is a schematic diagram of the structure of the test component and the observation component;

[0034] Figure 3 It is a schematic diagram of the structure of the injection component;

[0035] Figure 4 It is a schematic diagram of the structure of the detection pipeline.

[0036] In the figure:

[0037] 100, test component; 101, placement interval; 102, kettle body structure; 103, kettle body component; 104, dialysis channel; 104a, dialysis port; 105, base component; 106, clamping structure; 107, fixing component; 108, movable component;

[0038] 200, observation component; 201, observation interval; 202, outer shell component; 203, inner shell component; 204, end plate component; 205, image component; 206, camera component; 207, light source component; 208, visual window;

[0039] 300, injection component; 301, flow path unit; 302, inflow section; 302a, first section; 302b, second section; 303, outflow section; 304, pump body; 305, container component;

[0040] 400, monitoring pipeline; 401, drainage branch; 402, sampling branch; 403, pressure branch; 404, heating component; 405, control component;

[0041] 500, core sample. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] A high-temperature and high-pressure dialysis instrument (hereinafter referred to as the dialysis instrument), referring to Figure 1 , the main body is composed of an injection component 300, a test component 100, and an observation component 200. When the dialysis instrument works, the dialysis fluid (such as fracturing oil) enters the test component 100 through the injection component 300 and contacts the core sample 500 placed in the test component 100. Under the set pressure and temperature, the dialysis fluid and the core sample 500 are dialyzed and replaced, and the experimental process is observed through the observation component 200 and the dialysis replacement rate is read.

[0044] Specifically, referring to Figure 1 and 2 , in some embodiments, the above-mentioned test component 100 includes a kettle body structure 102, and a placement interval 101 is defined in the kettle body structure 102. The placement interval 101 constitutes an accommodation interval for the core sample 500. Correspondingly, the above-mentioned observation component 200 includes a housing structure, and an observation interval 201 is defined in the housing structure. The observation interval 201 is fluidly connected to the placement interval 101 in the kettle body structure 102. In some embodiments, a dialysis channel 104 is provided on the kettle body structure 102. The dialysis channel 104 constitutes a connection channel between the placement interval 101 and the observation interval 201, and the dialysis channel 104 has a dialysis port 104a in contact with the placement interval 101. During the working process of the dialysis instrument, the dialysis port 104a of the dialysis channel 104 is closed by the core sample 500 to prevent the dialysis fluid in the placement interval 101 from entering the dialysis channel 104 through the dialysis port 104a and flowing into the observation interval 201. As the experiment progresses, the dialysis fluid and the core sample 500 are replaced, and the replaced dialysis fluid enters the observation interval 201 through the dialysis channel 104, and the experimental process and results are observed by the image component 205 in the subsequent observation component 200.

[0045] Return to Figure 2, continue to describe the dialysis instrument. In some embodiments, the above-mentioned kettle body structure 102 includes a kettle body member 103 and a base member 105. A section with an open bottom is defined within the kettle body member 103. The base member 105 is detachably assembled to the open end of the kettle body member 103 and closes the opening to form the above-mentioned placement section 101. In some examples, the kettle body member 103 and the base member 105 are connected by bolt fasteners to facilitate the placement and replacement of the core. Further, in some embodiments, the above-mentioned dialysis instrument further includes a clamping structure 106 assembled within the placement section 101. The clamping structure 106 is configured to clamp the core sample 500 so that the core sample 500 remains at a set position within the placement section 101 during the experiment. Preferably, the above-mentioned core sample 500 can be held suspended within the placement section 101 under the action of the clamping structure 106 to increase the contact area between the dialysis liquid and the core sample 500. In some examples, the above-mentioned clamping structure 106 includes a fixed member 107 and a movable member 108. The fixed member 107 is assembled on the base member 105. One end of the movable member 108 (subsequently referred to as the first connection end) is connected to the fixed member 107, and the other end (subsequently referred to as the second connection end) constitutes the installation end of the core sample 500. In this example, the first connection end of the movable member 108 and the fixed member 107 are configured as a rotational connection; the core sample 500 is fixed to the second connection end of the movable member 108 by fasteners such as screws. In some embodiments, the dialysis port 104a of the above-mentioned dialysis channel 104 is configured as an inverted conical port. Refer to Figure 2 , at this time, on the one hand, the core sample 500 can isolate the placement section 101 and the dialysis channel 104 at the position of the dialysis port 104a. On the other hand, the upper end surface of the core sample 500 can be used as the outflow surface of the dialysis liquid replacement liquid.

[0046] Refer to Figure 1 and 3, in some embodiments, the above-mentioned injection component 300 includes at least one flow path unit 301. A single flow path unit 301 includes an inflow section 302 and an outflow section 303. The dialysate flows into the placement area 101 from the inflow section 302 of the flow path unit 301, undergoes dialysis replacement with the core sample 500 under set temperature and pressure conditions, and is discharged from the outflow section 303 in the flow path unit 301. Specifically, valves are provided on both the inflow section 302 and the outflow section 303 of the flow path unit 301 to control the opening and closing of the flow path unit 301. At the same time, a pump body 304 and a container component 305 are provided on the inflow section 302 of the flow path unit 301. The pump body 304 is configured as a power source for the dialysate, and the container component 305 stores the dialysate. When the dialyzer operates, the dialysate stored in the container component 305 is supplied to the placement area 101 under the action of the pump body 304. In some embodiments, the above-mentioned container component 305 is configured as a piston container. The internal area of the container component 305 is divided into a first area and a second area by a piston. The first area is configured as a storage area for the dialysate and is fluidly connected to the placement area 101, and the second area is fluidly connected to the pump body 304. At this time, the supply of the dialysate can be realized through the movement of the piston in the container component 305. In some examples, multiple flow path units 301 are provided, and different flow path units 301 are configured to supply different dialysates to the placement area 101 to meet different experimental requirements. Further, referring to Figure 3 , in some examples, the above-mentioned multiple flow path units 301 share the same outflow section 303. Correspondingly, the inflow section 302 of the flow path unit 301 includes a first section 302a and a second section 302b. The above-mentioned pump body 304 and container component 305 are provided on the first section 302a, and multiple flow path units 301 share the same pump body 304. At the same time, multiple flow path units 301 share the same second section 302b. Through this arrangement, the number of pipelines can be reduced.

[0047] In some embodiments, the above-mentioned dialyzer further includes a heating component, which is configured to heat the kettle body structure 102 so that the placement area 101 reaches and maintains a set stability.

[0048] Referring to Figure 2, in some embodiments, the above-mentioned housing structure includes an outer housing member 202 and an inner housing member 203. The outer housing member 202 is assembled at the top of the kettle body structure 102. In some examples, the outer housing member 202 and the kettle body member 103 are configured to be threadedly connected. Further, an installation interval extending along the axis O of the kettle body structure 102 (subsequently referred to as the first direction) is formed inside the outer housing member 202. At the same time, at least part of the side wall of the outer housing member 202 is configured as a visible window 208, that is, at least part of the side wall of the outer housing member 202 is made of a transparent material to allow observation of the installation interval from outside the outer housing member 202. Exemplarily, the above-mentioned outer housing member 202 has a visible window 208 arranged radially symmetrically. Back to Figure 2 , continue to describe the housing structure. The above-mentioned inner housing member 203 is arranged inside the outer housing member 202 and is configured to extend along the first direction. And the above-mentioned observation interval 201 is configured as the internal interval of the inner housing member 203. At the same time, the inner housing member 203 is made of a transparent material. Further, the above-mentioned housing structure also includes an end plate member 204 assembled outside the visible window 208 of the outer housing member 202, and an opening is provided on the end plate member 204 to allow observation of the observation interval 201 from outside the outer housing member 202.

[0049] Refer to Figure 2 , the above-mentioned observation assembly 200 further includes an image assembly 205. In some embodiments, the image assembly 205 includes a camera member 206. The camera member 206 is arranged at the position of the visible window 208 of the outer housing member 202 and is configured to be able to acquire images and / or video information of the observation interval 201 and can transmit the acquired images and / or video information to the subsequent control assembly 405 for analysis. In some other embodiments, the above-mentioned image assembly 205 further includes a light source member 207. The light source member 207 is configured to emit light rays towards the observation interval 201 to increase the brightness of the observation interval 201, thereby facilitating the observation of the experimental process and results.

[0050] Refer to Figure 1 And 3 , the above-mentioned dialysis instrument further includes a monitoring assembly. In some embodiments, the above-mentioned monitoring assembly includes a monitoring pipeline 400 fluidly connected to the above-mentioned observation assembly 200. The monitoring pipeline 400 at least includes an evacuation branch 401, a sampling branch 402 and a pressure branch 404. A pressure detection device (such as a pressure gauge) is provided on the pressure branch 404 to realize the monitoring of the experimental pressure.

[0051] Refer to Figure 1, the above dialysis instrument further includes a control component 405 (such as a computer), which is connected to the above image component 205, monitoring component, heating component and injection component 300 through a data line, and is used to control the actions of the image component 205, monitoring component, heating component and injection component 300 to realize the control of the dialysis instrument work process, and can receive the image and pressure data transmitted from the image component 205 and monitoring component, and generate corresponding records for subsequent statistical research.

[0052] The working process of the above dialysis instrument is as follows:

[0053] S1: Core sample 500 processing stage: Dry and weigh the core sample 500 containing the fracture, measure the permeability of the core sample 500 by the soap film method, and after placing the core sample 500 in the clamping structure 106, assemble the base member 105 and the kettle body member 103 to form the placement interval 101.

[0054] S2: Fracturing fluid injection stage: Inject different dialysis fluids into the placement interval 101 through the injection component 300, and make the placement interval 101 reach the preset pressure and temperature.

[0055] S3: Soaking well stage: Stop injecting the dialysis fluid, maintain the set pressure and temperature, and make the rock dialysis fluid and the core sample 500 undergo dialysis replacement.

[0056] S4: End of soaking well stage: By setting 10 days, 15 days, 20 days, 25 days, 30 days, 35 days, 40 days, 45 days, 50 days, 55 days, 60 days as the end time of soaking well respectively, observe the dialysis replacement efficiency directly by reading in the observation interval 201.

[0057] S5: Data acquisition: The system process is intuitively displayed on the interface of the control component 405, and parameters such as pressure, temperature, and oil washing amount in the dialysis instrument are collected in real time, and an EXCEL data report is generated.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature and high-pressure imbibition instrument, characterized in that, Comprising: A kettle body structure, which defines a placement interval for accommodating core samples therein and has a dialysis channel for the outflow of the replacement dialysis fluid. The dialysis channel has a dialysis port extending into the placement interval, and the dialysis port is configured to be closed by the core sample. A housing structure, which defines an observation interval therein, and at least part of the side wall of the housing member is made of a transparent material. The observation interval is communicated with the placement interval through the dialysis channel. An injection assembly, including at least one flow path unit. A single flow path unit has an inflow section and an outflow section that are fluidly connected to the placement interval. The dialysis fluid enters the placement interval from the inflow section and is discharged through the outflow section.

2. The high-temperature and high-pressure imbibition instrument according to claim 1, characterized in that: The dialysis instrument further includes: A clamping structure, which is assembled in the placement interval and is configured to hold the core sample in a set position.

3. The high-temperature and high-pressure imbibition instrument according to claim 2, characterized in that: The core sample is configured to be held suspended under the action of the clamping structure.

4. The high-temperature and high-pressure imbibition instrument according to claim 1, characterized in that: The dialysis port is configured as an inverted conical port.

5. The high-temperature and high-pressure imbibition instrument according to claim 1, wherein: The housing structure includes: An outer shell member, which is assembled at the top of the kettle body structure and defines an installation interval extending in a first direction therein, and at least part of the side wall of the outer shell member is configured as a visible window. An inner shell member, which is assembled in the installation interval and is made of a transparent material, and the internal interval of the inner shell member is configured as the observation interval.

6. The high-temperature and high-pressure imbibition instrument according to claim 5, characterized in that: The dialysis instrument further includes: End plate members, which are assembled on the outer shell member and are located outside the visible window, and both of the end plate members have openings.

7. A high-temperature and high-pressure imbibition instrument according to claim 1, characterized in that: The dialysis instrument further includes an image assembly, and the image assembly includes: A camera member, which is configured to acquire image and / or video information of the observation interval.

8. The high-temperature and high-pressure imbibition instrument according to claim 7, characterized in that: The image assembly further includes: A light source member, which is configured to emit light towards the observation interval.

9. The high-temperature and high-pressure imbibition instrument according to claim 1, wherein: A pump body and a container component are provided on the inflow section of the flow path unit, and the container component stores dialysis fluid.

10. The high-temperature and high-pressure imbibition instrument according to claim 1, characterized in that: The kettle body structure includes: A kettle body member, which defines an interval with one end open therein. A base member, which is detachably installed at the open end of the kettle body member and closes the opening to form the placement interval.

11. A high-temperature and high-pressure imbibition instrument according to claim 1, characterized in that: The dialysis instrument further includes: A heating assembly, which is configured to heat the kettle body structure so that the temperature of the placement interval reaches a set value and is maintained.

12. The high-temperature and high-pressure imbibition apparatus according to claim 1, characterized in that: The dialysis instrument further includes: A monitoring pipeline, which is fluidly connected to the observation interval and includes an evacuation branch, a sampling branch, and a pressure branch.

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