Core sample analysis equipment for oil and shallow gas exploration

Abstract

The present application provides a kind of core sample analysis equipment for petroleum and shallow gas exploration, including formation pressure simulation system, permeability detection system and control system.Formation pressure simulation system includes pressure vessel and pressure loading mechanism, formation pressure environment simulation material for placing core sample and being wrapped around core sample in pressure vessel, and liquid inlet is also provided on pressure vessel.Pressure loading mechanism is used to exert pressure on formation pressure environment simulation material in pressure vessel, and formation pressure environment simulation material transmits pressure to the surrounding of core sample.The liquid supply end of permeability detection system is connected with the liquid inlet of pressure vessel.The controller is used to control the permeability detection system to test the permeability of core sample under simulated formation pressure environment.The core sample analysis equipment for petroleum and shallow gas exploration provided by the present application can test the permeability of core sample obtained by exploration based on simulated formation pressure environment.

Description

Technical Field

[0001] This invention relates to the field of petroleum exploration technology, and in particular to a core sample analysis device for petroleum and shallow gas exploration. Background Technology

[0002] There is a genetic relationship between oil and shallow gas exploration, which can be explored through combined exploration methods. These methods include comprehensive crude oil physical property testing, saturated hydrocarbon gas chromatography-mass spectrometry analysis, and natural gas sample composition and carbon isotope analysis. Using these methods, the genetic relationship between heavy oil reservoirs and shallow gas reservoirs can be clarified, and by using discovered shallow gas reservoirs, the source can be traced back along the heavy oil-shallow gas transport system, enabling precise exploration of heavy oil reservoirs.

[0003] Core analysis is a crucial technique in oil exploration. It determines the properties and characteristics of underground mineral deposits by analyzing core samples retrieved during drilling, aiding oil exploration personnel in more accurate exploration. To better analyze the characteristics and properties of the core samples, oil exploration personnel need to grind the samples into specimens of a fixed size. Core testing can be broadly categorized into physical testing and chemical testing. Physical testing examines the physical properties of the core samples. These properties primarily include porosity, permeability, compressive strength, and plasticity. These physical properties directly reflect the physical characteristics of underground mineral deposits and are highly helpful in determining deposit types and assessing reserves.

[0004] Existing patent literature contains information on core permeability testing, such as the document on a testing device and method for testing the mechanical properties of geothermal exploration core samples, disclosed in patent application number 2024104174792. This testing device includes a test chamber, testing components installed inside the test chamber for testing the mechanical properties of the sampled core permeability, and cleaning components installed on the test chamber for cleaning the surface of the sampled core during the testing process. This testing device can complete the mechanical property testing of the core through the cooperation of the testing components, lifting components, and guiding components. However, this testing device does not simulate the original rock strata pressure of the sampled core, which leads to deviations in the obtained core characteristic data from the more realistic rock strata data, ultimately affecting the accuracy of subsequent exploration work. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a core sample analysis device for oil and shallow gas exploration, aiming to address the problem that existing testing devices, due to the lack of a simulated original rock pressure environment for core sampling, result in inaccurate core characteristic data that may not accurately reflect the actual rock formation.

[0006] This invention provides a core sample analysis device for oil and shallow gas exploration, comprising:

[0007] A formation pressure simulation system includes a pressure vessel and a pressure loading mechanism. The top of the pressure vessel is open. The telescopic part of the pressure loading mechanism is used to enter and exit the pressure vessel through the top of the pressure vessel. The outer peripheral surface of the telescopic part of the pressure loading mechanism is in sliding sealing contact with the inner surface of the pressure vessel. The pressure vessel is used to place a core sample and formation pressure environment simulation material surrounding the core sample. The pressure vessel is also provided with a liquid inlet, which connects the inner and outer sides of the pressure vessel.

[0008] A permeability testing system includes a test liquid supply component and a flow detection device. The outlet of the test liquid supply component is connected to the inlet, and the flow detection device is mounted on the test liquid supply component.

[0009] The control system includes an exhaust valve, a humidity detection device, a first pressure detection device, a second pressure detection device, and a controller. The exhaust valve, humidity detection device, first pressure detection device, second pressure detection device, test liquid supply assembly, and pressure loading mechanism are all electrically connected to the controller. The exhaust valve is located on the telescopic part of the pressure loading mechanism, and when the exhaust valve is open, it connects the inner and outer sides of the pressure vessel. The detection end of the humidity detection device is located on the side of the telescopic part of the pressure loading mechanism closer to the inner side of the pressure vessel. The first pressure detection device is located inside the pressure vessel, and the second pressure detection device is located on the test liquid supply assembly near the outlet end. The controller controls the opening and closing of the exhaust valve based on the signal from the humidity detection device, controls the start and stop of the pressure loading mechanism based on the signal from the first pressure detection device, and controls the start and stop of the test liquid supply assembly based on the signal from the second pressure detection device.

[0010] According to the core sample analysis equipment for oil and shallow gas exploration provided by the present invention, the test fluid supply assembly includes:

[0011] liquid storage container;

[0012] A liquid supply pipeline is provided, with one end connected to the liquid storage container and the other end connected to the liquid inlet of the pressure vessel. A booster pump and a one-way valve are sequentially arranged on the liquid supply pipeline from the liquid storage container to the pressure vessel. The one-way valve is directed from the booster pump to the pressure vessel. The second pressure detection device and the flow detection device are both located on the pipeline between the one-way valve and the pressure vessel.

[0013] The core sample analysis equipment for oil and shallow gas exploration provided by the present invention further includes a formation pressure environment simulation material supply component, wherein the discharge end of the formation pressure environment simulation material supply component is located above the pressure vessel.

[0014] According to the core sample analysis equipment for oil and shallow gas exploration provided by the present invention, the formation pressure environment simulation material supply component includes:

[0015] A storage container, wherein a material outlet is provided at the bottom of the storage container;

[0016] The first conveying mechanism has its inlet end detachably connected to the material outlet or located below the material outlet, and its outlet end located above the pressure vessel.

[0017] The core sample analysis equipment for oil and shallow gas exploration provided by the present invention further includes a material discharge assembly. The bottom of the pressure vessel is provided with a discharge port, and a first control valve is provided at the discharge port. The material discharge assembly includes:

[0018] A solid-liquid separation pipeline, the top end of which is connected to the discharge port, the solid-liquid separation pipeline includes a horizontal section, the horizontal section of which is provided with a downward-facing liquid diversion port, a filter device being provided at the liquid diversion port, and the end of the horizontal section of the solid-liquid separation pipeline away from the discharge port being a solid diversion port;

[0019] A liquid discharge pipe is connected at one end to the liquid diversion port and at the other end to the liquid storage container;

[0020] The second feeding mechanism has its inlet end connected to or located below the solid diversion port, and its outlet end located above the storage container.

[0021] According to the core sample analysis equipment for oil and shallow gas exploration provided by the present invention, the formation pressure environment simulation material is a squeeze sphere, and the outside of the core sample is also covered with a pressure dispersion sleeve. The pressure dispersion sleeve is used to convert the point contact between the squeeze sphere and the core sample into a surface contact between the pressure dispersion sleeve and the core sample.

[0022] According to the core sample analysis equipment for oil and shallow gas exploration provided by the present invention, the pressure vessel is provided with a liquid inlet area, the liquid inlet area is provided with a plurality of liquid inlets, a dispersive liquid supply element is provided at one end of the liquid supply pipeline connected to the pressure vessel, the dispersive liquid supply element covers the liquid inlet area, and a mesh plate is provided inside the dispersive liquid supply element.

[0023] According to the core sample analysis equipment for oil and shallow gas exploration provided by the present invention, the storage container includes at least two, and the multiple storage containers are connected one-to-one on multiple planetary gears of the planetary gear mechanism. The discharge end of the second conveying mechanism and the inlet end of the first conveying mechanism are both located on the revolution trajectory of the storage container.

[0024] The core sample analysis equipment for oil and shallow gas exploration provided by the present invention further includes a cleaning mechanism. The cleaning fluid inlet and the cleaning fluid return outlet of the cleaning mechanism are both located on the orbital trajectory of the storage container, and the cleaning fluid inlet of the cleaning mechanism is located above the corresponding storage container. The cleaning fluid return outlet of the cleaning mechanism is used for detachable connection with the material outlet of the corresponding storage container.

[0025] According to the core sample analysis equipment for oil and shallow gas exploration provided by the present invention, the cleaning mechanism includes:

[0026] Cleaning solution container;

[0027] A cleaning fluid pumping pipeline, one end of which is connected to the cleaning fluid container, and the other end of which is equipped with a spraying disc, which is suspended above the orbital trajectory of the storage container.

[0028] A waste liquid recovery pipeline, one end of which is detachably connected to the material outlet of one of the storage containers via a solid-liquid separator, and the other end of which is connected to the cleaning liquid container.

[0029] The present invention has the following advantages due to the adoption of the above technical solutions:

[0030] The present invention provides a core sample analysis device for oil and shallow gas exploration, comprising a formation pressure simulation system, a permeability detection system, and a control system. The formation pressure simulation system includes a pressure vessel and a pressure loading mechanism. The top of the pressure vessel is open, and the telescopic part of the pressure loading mechanism is used to enter and exit the pressure vessel through the top of the pressure vessel. The outer circumferential surface of the telescopic part of the pressure loading mechanism is in sliding sealing contact with the inner surface of the pressure vessel. The pressure vessel contains a core sample and formation pressure environment simulation material surrounding the core sample. The pressure vessel also has a liquid inlet connecting the inner and outer sides of the pressure vessel. The permeability detection system includes a test fluid supply component and a flow detection device. The outlet of the test fluid supply component is connected to the inlet, and the flow detection device is mounted on the test fluid supply component. The control system includes an exhaust valve, a humidity detection device, a first pressure detection device, a second pressure detection device, and a controller. The exhaust valve, humidity detection device, first pressure detection device, second pressure detection device, test fluid supply assembly, and pressure loading mechanism are all electrically connected to the controller. The exhaust valve is located on the telescopic part of the pressure loading mechanism. The detection end of the humidity detection device is located on the side of the telescopic part of the pressure loading mechanism closer to the pressure vessel. The first pressure detection device is located inside the pressure vessel, and the second pressure detection device is located on the test fluid supply assembly near the pressure vessel. In use, the controller first controls the pressure loading mechanism to move the telescopic part to the outside of the pressure vessel, opening the top of the pressure vessel. The core sample and formation pressure environment simulation material are then placed inside the pressure vessel, ensuring the formation pressure environment simulation material surrounds the core sample and fills the entire pressure vessel. Then, the controller controls the telescopic part of the pressure loading mechanism to move inside the pressure vessel, applying downward pressure to the formation pressure environment simulation material. Simultaneously, the controller controls the exhaust valve to open, allowing the exhaust valve to connect both the inside and outside of the pressure vessel. When the controller detects that the pressure value of the first pressure detection device has reached the preset pressure, the controller controls the pressure loading mechanism to lock the telescopic part. The controller then controls the test fluid supply assembly to input test fluid into the pressure vessel. When the level of the test fluid contacts the bottom surface of the telescopic part of the pressure loading mechanism, it indicates that the pressure vessel is full of test fluid and the internal gas has been vented. At this time, the humidity detection device detects a humidity signal, and the controller controls the exhaust valve to close. When the pressure detected by the second pressure detection device reaches the maximum set value, the controller controls the test fluid supply assembly to stop supplying fluid. The test fluid in the pressure vessel will permeate into the core sample, thereby reducing the pressure inside the pressure vessel. When the pressure detected by the second pressure detection device reaches the minimum set value, the controller controls the test fluid supply assembly to continue supplying fluid. When the pressure detected by the second pressure detection device reaches the maximum set value, the controller again controls the test fluid supply assembly to stop supplying fluid.This process is repeated until the pressure value detected by the second pressure detection device no longer drops to the minimum set value. At this point, the maximum permeability of the core sample is considered to have been reached, and the total flow rate detected by the flow detection device at this point is the permeability of the core sample. The core sample analysis equipment for oil and shallow gas exploration provided by this invention enables the detection of permeability in core samples obtained during exploration, based on a simulated formation pressure environment. This makes the detection data of the core samples closer to their actual characteristics within the rock strata, thus providing more accurate guidance for subsequent development and mining. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a core sample analysis device for oil and shallow gas exploration provided in an embodiment of the present invention;

[0033] Figure 2 This is a top view of a plurality of storage containers connected to a planetary gear mechanism according to an embodiment of the present invention;

[0034] Figure 3 This is a partial cross-sectional view of a pressure dispersion enclosure provided in an embodiment of the present invention.

[0035] Figure label:

[0036] 110: Pressure vessel; 121: Core sample; 122: Formation pressure environment simulation material; 131: Cylinder; 132: Valve plate; 210: Liquid storage container; 221: Booster pump; 222: Check valve; 223: Dispersed liquid supply element; 224: Dense fiber mesh; 310: Material storage container; 321: Feed pipe; 322: Feed blower; 411: Solid-liquid separation pipeline; 412: Filter screen; 420: Liquid discharge pipeline; 421: Return pump; 422: First filter; 431: Discharge pipe; 432: Discharge blower; 500: Pressure dispersion sleeve; 510: Metal wire braided mesh; 520: Disordered elastic metal wire; 610: Gear ring; 620: Sun gear; 630: Planetary gear; 640: Drive motor; 650: Drive shaft; 710: Cleaning fluid container; 721: Cleaning fluid delivery pipe; 722: Cleaning fluid delivery pump; 723: Spraying disc; 731: Waste liquid recovery pipe; 732: Receiving disc; 733: Waste liquid recovery pump; 734: Second filter. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] This invention provides a core sample analysis device for oil and shallow gas exploration, comprising a formation pressure simulation system, a permeability detection system, and a control system. The formation pressure simulation system includes a pressure vessel and a pressure loading mechanism. The pressure vessel contains a core sample and a formation pressure environment simulation material surrounding the core sample. The pressure vessel also has a liquid inlet. The pressure loading mechanism applies pressure to the formation pressure environment simulation material within the pressure vessel, which then transmits the pressure to the area surrounding the core sample. The liquid supply end of the permeability detection system is connected to the liquid inlet of the pressure vessel. The controller controls the permeability detection system to perform permeability testing on the core sample under simulated formation pressure conditions. This invention provides a core sample analysis device for oil and shallow gas exploration, enabling permeability detection of explored core samples under simulated formation pressure conditions. This results in core sample data that more closely reflects the actual characteristics of the rock formation, providing more accurate guidance for subsequent development and mining.

[0044] The following is combined Figures 1 to 3 This invention describes a core sample analysis device for oil and shallow gas exploration.

[0045] like Figures 1 to 3 As shown in the figure, an embodiment of the present invention provides a core sample analysis device for oil and shallow gas exploration, including a formation pressure simulation system, a permeability detection system, and a control system. The formation pressure simulation system provides the original formation pressure environment for the detection of core sample 121, thereby enabling the detection data of core sample 121 to more accurately and realistically reflect the condition of the explored rock formation. The permeability detection system pressurizes the formation pressure simulation system and detects the permeability of the core sample 121. The control system controls the formation pressure simulation system and the permeability detection system to complete the experiment.

[0046] The formation pressure simulation system includes a pressure vessel 110 and a pressure loading mechanism.

[0047] The pressure vessel 110 can be a cylindrical structure with an open top and a liquid inlet on one side. The pressure vessel 110 is used to place the core sample 121 and the formation pressure environment simulation material 122. The formation pressure environment simulation material 122 is used to wrap around the core sample 121 and fill the entire pressure vessel 110.

[0048] The pressure loading mechanism may include a cylinder 131 and a valve plate 132. The cylinder 131 is fixed to the top of the pressure vessel 110 by a bracket. The telescopic rod of the cylinder 131 is arranged downwards, extending downwards and retracting upwards. The valve plate 132 is connected to the bottom of the telescopic rod, forming the telescopic part of the pressure loading mechanism. The cylinder 131 can drive the valve plate 132 to enter and exit the pressure vessel 110. When the valve plate 132 enters the pressure vessel 110 through the top, the outer peripheral surface of the valve plate 132 slides and seals against the inner surface of the pressure vessel 110, forming a sealed space in the portion of the pressure vessel 110 below the valve plate 132.

[0049] The permeability testing system includes a test solution supply assembly and a flow detection device. The outlet of the test solution supply assembly is connected to the inlet of the pressure vessel 110, and the test solution supply assembly is used to supply test solution into the pressure vessel 110. The flow detection device is located near the pressure vessel 110 and is used to detect the total flow rate of the test solution supplied by the test solution supply assembly into the pressure vessel 110.

[0050] The control system includes an exhaust valve, a humidity detection device, a first pressure detection device, a second pressure detection device, and a controller. The exhaust valve, humidity detection device, first pressure detection device, second pressure detection device, test fluid supply assembly, and pressure loading mechanism are all electrically connected to the controller. The exhaust valve is located on the telescopic part of the pressure loading mechanism. The detection end of the humidity detection device is located on the side of the telescopic part of the pressure loading mechanism near the pressure vessel 110. The first pressure detection device is located inside the pressure vessel, and the second pressure detection device is located on the test fluid supply assembly near the pressure vessel 110.

[0051] During operation, the controller first controls cylinder 131 to move valve plate 132 to the top of pressure vessel 110, thus opening the top of pressure vessel 110. At this time, a certain amount of formation pressure environment simulation material 122 can be added into pressure vessel 110. Then, core sample 121 is placed into pressure vessel 110, and more formation pressure environment simulation material 122 is added until the pressure vessel 110 is completely filled. When adding formation pressure environment simulation material 122 and core sample 121, it is necessary to ensure that formation pressure environment simulation material 122 is present around core sample 121.

[0052] Then, the controller controls cylinder 131 to move valve plate 132 downwards, causing valve plate 132 to enter the pressure vessel 110 through the opening at the top. Simultaneously, the controller controls the exhaust valve on valve plate 132 to open, allowing gas inside the pressure vessel 110 to be discharged through the exhaust valve as cylinder 131 moves valve plate 132 downwards. When the controller detects that the pressure value of the first pressure detection device has reached the preset pressure, the controller controls cylinder 131 to stop moving and locks the telescopic rod.

[0053] It should be noted that the preset pressure is the pressure value of the stratum where core sample 121 is located.

[0054] Then the controller controls the test liquid supply component to supply test liquid into the pressure vessel 110. As the test liquid level rises, the gas in the pressure vessel 110 continues to be discharged through the exhaust valve. When the controller detects the signal from the humidity detection device, it indicates that the test liquid has come into contact with the bottom surface of the valve plate 132, that is, the test liquid has filled the pressure vessel 110. At this time, the controller controls the exhaust valve on the valve plate 132 to close.

[0055] As the test fluid supply component continuously supplies fluid, the pressure of the test fluid in the pressure vessel 110 continuously increases. When the controller detects that the pressure signal from the second pressure detection device has reached the maximum set value, the controller controls the test fluid supply component to stop supplying fluid. When test fluid is present in the pressure vessel 110, the test fluid will permeate into the core sample 121. As the amount of test fluid permeating increases, the liquid pressure in the pressure vessel 110 decreases. When the controller detects that the pressure signal from the second pressure detection device has reached the minimum set value, the controller controls the test fluid supply component to continue supplying fluid until the controller detects that the pressure signal from the second pressure detection device has reached the maximum set value, at which point the controller controls the test fluid supply component to stop supplying fluid. This process repeats until the pressure signal from the second pressure detection device no longer drops to the minimum set value. At this point, the maximum permeability of the core sample 121 is considered to have been reached, and the total flow rate detected by the flow detection device at this time is the permeability of the core sample 121. The core sample analysis equipment for oil and shallow gas exploration provided by this invention enables the detection of permeability of core sample 121 obtained from exploration based on a simulated formation pressure environment. This makes the detection data of core sample 121 closer to its actual characteristics in the rock strata, thereby providing more accurate guidance for subsequent development and mining.

[0056] In some embodiments, the test liquid supply assembly includes a liquid storage container 210 and a liquid supply line.

[0057] One end of the liquid supply line is connected to the bottom of the liquid storage container 210, and the other end is connected to the inlet of the pressure vessel 110. The liquid supply line is equipped with a booster pump 221 and a check valve 222. The booster pump 221 is positioned near the liquid storage container 210, and the check valve 222 is positioned near the pressure vessel 110, with the flow direction of the check valve 222 facing towards the pressure vessel 110, to prevent the test liquid in the pressure vessel 110 from flowing back into the liquid storage container 210.

[0058] In some embodiments, a formation pressure environment simulation material supply assembly is also included, the discharge end of which is located above the pressure vessel 110, for supplying formation pressure environment simulation material 122 into the pressure vessel 110.

[0059] Specifically, the formation pressure environment simulation material supply assembly includes a storage container 310 and a first conveying mechanism.

[0060] The storage container 310 is used to store the formation pressure environment simulation material 122.

[0061] The first material conveying mechanism can be a chain conveyor, a screw feeder, etc. In this embodiment, the first material conveying mechanism includes a feed pipe 321 and a feed fan 322.

[0062] A material outlet is provided at the bottom of the storage container 310, and a second control valve is installed at the material outlet. One end of the feed pipe 321 is detachably connected to the material outlet of the storage container 310, and the other end extends to the top of the pressure vessel 110. A feed fan 322 is located on the outside of the end of the feed pipe 321 near the storage container 310, and the feed fan 322 is used to provide power for the formation pressure environment simulation material 122 in the feed pipe 321 to move towards the pressure vessel 110.

[0063] When filling is required in the pressure vessel 110, the controller controls the second control valve to open and simultaneously controls the feed fan 322 to start, so as to transport the formation pressure environment simulation material 122 in the storage container 310 to the pressure vessel 110.

[0064] In some embodiments, the pressure vessel 110 is provided with a discharge port at the bottom, and a first control valve is provided at the discharge port. The core sample analysis equipment for oil and shallow gas exploration also includes a material discharge assembly, which includes a solid-liquid separation pipeline 411, a liquid discharge pipeline 420, and a second conveying mechanism.

[0065] The bottom of the pressure vessel 110 is a funnel structure, which facilitates the falling of the formation pressure environment simulation material 122 and the test liquid.

[0066] The solid-liquid separation pipeline 411 includes a vertical section and a horizontal section. The top of the vertical section is connected to the discharge port of the pressure vessel 110, and the bottom of the vertical section is connected to one end of the horizontal section via an arc-shaped pipe. The other end of the horizontal section is a solid diversion port. A downwardly extending recessed structure is provided at the bottom of the horizontal section, and the bottom end of the recessed structure is a liquid diversion port. A filter device, which can be a filter screen 412, is provided at the position corresponding to the recessed structure within the horizontal section.

[0067] One end of the liquid discharge pipe 420 is connected to the liquid diversion port, and the other end is connected to the liquid storage container 210. A reflux pump 421 and a first filter 422 are provided on the liquid discharge pipe 420. The first filter 422 is located on the side of the reflux pump 421 near the liquid storage container 210.

[0068] The second conveying mechanism can be a chain conveyor or a screw conveyor, etc. In this embodiment, the second conveying mechanism includes a discharge pipe 431 and a discharge fan 432. One end of the discharge pipe 431 is connected to the solid diversion port of the solid-liquid separation pipeline 411, and the other end extends above the storage container 310. The discharge fan 432 is located at the end of the discharge pipe 431 near the solid diversion port, and is used to provide the power for the formation pressure environment simulation material 122 in the discharge pipe 431 to move towards the storage container 310.

[0069] After the test, the controller controls the cylinder 131 to slowly retract, which in turn drives the valve plate 132 to slowly move towards the opening end of the pressure vessel 110, thereby slowly releasing the high pressure inside the pressure vessel 110. When the second pressure detection device detects a pressure value of zero, the controller controls the first control valve, exhaust valve, discharge fan 432, and return pump 421 to open simultaneously. At this time, the pressure vessel 110 is opened. Because there is no positive or negative pressure, the formation pressure environment simulation material 122 and test liquid inside the pressure vessel 110 will not be rapidly ejected (as in the case of positive pressure) or be affected by external factors at the moment of opening. In the event of a sudden airflow impact (response under negative pressure), the formation pressure environment simulation material 122 and the test liquid in the pressure vessel 110 enter the solid-liquid separation pipeline 411 through the opened first control valve. The formation pressure environment simulation material 122 is discharged to the storage container 310 for reuse through the discharge pipe 431. When the test liquid flows through the filter screen 412, it passes through the mesh of the filter screen 412 and enters the liquid discharge pipeline 420, thereby separating from the formation pressure environment simulation material 122. The test liquid is then drawn by the return pump 421 and sent to the first filter 422 for filtration before entering the liquid storage container 210.

[0070] In some embodiments, the formation pressure environment simulation material 122 can be a squeezed sphere. The squeezed sphere, as a material simulating the original formation pressure environment, is laid around the core sample 121.

[0071] The extruded spheres need to meet the following requirements: small diameter and roundness error, small roughness, good compressive strength, and corrosion resistance. Extruded spheres are preferred materials for simulating the original formation pressure environment. The spherical structure transmits force more evenly when they are squeezed together. Therefore, in this case, the extrusion force applied by the valve plate 132 will be evenly transmitted to the area around the core sample 121 through the extruded spheres. This makes the simulated original formation pressure environment around the core sample 121 closer to reality, thereby improving the accuracy of the core sample 121 test data.

[0072] Furthermore, before placing the core sample 121 into the pressure container 110, it needs to be placed in a pressure dispersion sleeve 500, and then the core sample 121 wrapped in the pressure dispersion sleeve 500 is placed in the pressure container 110 for testing. The pressure dispersion sleeve 500 includes two layers of woven wire mesh 510, with disordered elastic wires 520 sandwiched between the two layers of woven wire mesh 510. The compressive force of the extrusion spheres around the core sample 121 is first applied to the pressure dispersion sleeve 500, and then transmitted to the surface of the core sample 121 through the pressure dispersion sleeve 500. The point contact between the extrusion spheres and the core sample 121 is converted into surface contact between the pressure dispersion sleeve 500 and the core sample 121, thereby making the force on the core sample 121 closer to the actual situation of being pressed and squeezed by the surrounding rock layers in the rock strata, thus improving the accuracy of the test data of the core sample 121. This also prevents excessive local pressure on the surface of core sample 121 due to point contact, which could lead to cracking and thus ensure the detection results of the permeability of core sample 121.

[0073] The disordered elastic wire 520 can also be replaced by other uniformly laid elastic components, such as springs or other elastic bodies.

[0074] In some embodiments, the pressure vessel 110 is provided with a liquid inlet area, and a liquid inlet is provided in the liquid inlet area, and a plurality of liquid inlets are provided in the liquid inlet area. A dispersive liquid supply element 223 is provided at one end of the liquid supply pipeline connected to the pressure vessel 110. The dispersive liquid supply element 223 covers the liquid inlet area, and a mesh plate is provided inside the dispersive liquid supply element 223.

[0075] like Figure 1As shown, the internal cavity of the dispersing liquid supply element 223 contains a pressed dense fiber mesh 224, which is the aforementioned mesh plate. The dense fiber mesh 224 covers the liquid inlet area of ​​the pressure vessel 110. The dense fiber mesh 224 can block the high-speed flow of the test liquid pumped into the cavity of the dispersing liquid supply element 223 by the booster pump 221, thereby reducing the flow velocity of the test liquid. This reduces the impact of the rapid impact of the test liquid on the periphery of the core sample 121, which may cause errors in the permeability detection structure, thus improving the accuracy of the detection data of the core sample 121 obtained from exploration.

[0076] In some embodiments, the storage container 310 includes at least two, and the multiple storage containers 310 are arranged one-to-one on multiple planetary gears 630 of the planetary gear mechanism. The discharge end of the second conveying mechanism and the discharge end of the first conveying mechanism are both located on the revolution trajectory of the storage container 310.

[0077] Specifically, such as Figures 1 to 2 As shown, six storage containers 310 can be provided, and the six storage containers 310 are distributed along a certain circular trajectory.

[0078] The planetary gear mechanism includes a ring gear 610, a sun gear 620, and planet gears 630. The ring gear 610 is fixed to the outside of six storage containers 310 via a frame, and its axis is coaxial with the distribution trajectory of the storage containers 310. The sun gear 620 is rotatably mounted in the middle of the six storage containers 310 via the frame, and its axis is coaxial with the distribution trajectory of the storage containers 310. Each storage container 310 has a planet gear 630 on its outside, and the planet gears 630 mesh with both the ring gear 610 and the sun gear 620 for transmission. The sun gear 620 is driven by a drive motor 640 and a drive shaft 650, which are connected and fixed via the frame. The drive motor 640 is connected to the controller via an electrical signal.

[0079] The lower end of the storage container 310 is configured as a funnel structure, with the material outlet located at the bottom of the funnel structure. A second control valve is installed inside the material outlet, and the second control valve is connected to the controller via an electrical signal. The end face of the second control valve and the end face of the material outlet are sealed by a sealing element.

[0080] Multiple storage containers 310 can hold formation pressure environment simulation materials 122 of different particle sizes and materials respectively. By moving the different material storage containers 310 to the position connected with the feed pipe 321, different formation pressure environment simulation materials 122 can be delivered into the pressure vessel 110.

[0081] In some embodiments, the core sample analysis equipment for oil and shallow gas exploration further includes a cleaning mechanism. The cleaning fluid inlet and waste liquid return outlet of the cleaning mechanism are both located on the orbital trajectory of the storage container 310, and the cleaning fluid inlet of the cleaning mechanism is located above the corresponding storage container 310. The waste liquid return outlet of the cleaning mechanism is used to connect to the material outlet of the corresponding storage container 310.

[0082] Specifically, such as Figures 1 to 2 As shown, the cleaning mechanism includes a cleaning fluid container 710, a cleaning fluid pumping pipeline, and a waste liquid recovery pipeline.

[0083] The cleaning fluid pumping pipeline includes a cleaning fluid delivery pipe 721 and a cleaning fluid delivery pump 722 and a spray plate 723 connected in series on the cleaning fluid delivery pipe 721. The inlet end of the cleaning fluid delivery pump 722 is connected to the cleaning fluid container 710 through the cleaning fluid delivery pipe 721. The spray plate 723 is connected to the end of the cleaning fluid delivery pipe 721, which is the cleaning fluid delivery port. When the storage container 310 is in the cleaning position, the spray plate 723 is located above the storage container 310, and the spray direction of the spray plate 723 is downward.

[0084] The waste liquid recovery pipeline includes a waste liquid recovery pipe 731 and a receiving tray 732, a waste liquid recovery pump 733, a solid-liquid separator, and a second filter 734 connected in series on the waste liquid recovery pipe 731. The receiving tray 732 is fixed by a bracket, and the solid-liquid separator is disposed within the receiving tray 732. When the storage container 310 moves to the cleaning position, the receiving tray 732 is located below the storage container 310 and can be connected to the material outlet below the storage container 310. The inlet end of the waste liquid recovery pump 733 is connected to the receiving tray 732 through the waste liquid recovery pipe 731. One end of the filter is connected to the outlet of the waste liquid recovery pump 733 through the waste liquid recovery pipe 731, and the other end is connected to the cleaning fluid container 710 through the waste liquid recovery pipe 731.

[0085] After all the formation pressure environment simulation material 122 in the pressure vessel 110 is transported into the storage container 310, the controller controls the motor 640 to rotate, and the motor 640 drives the sun gear 620 to rotate, thereby causing multiple storage containers 310 to revolve around the sun gear 620. When the storage container 310 containing the formation pressure environment simulation material 122 that needs to be cleaned moves to the cleaning position, the material outlet of the storage container 310 is connected to the receiving plate 732. Subsequently, the controller opens the second control valve and simultaneously starts the cleaning fluid delivery pump 722. The cleaning fluid delivery pump 722 then pumps the cleaning fluid from the cleaning fluid container 710 to the spray plate 723. The cleaning fluid sprayed from the spray plate 723 washes the formation pressure environment simulation material 122 in the storage container 310 below, removing the test fluid and other impurities from the surface of the formation pressure environment simulation material 122. This not only facilitates the next use but also eliminates the influence of impurities on permeability and the uniformity of the extrusion pressure transmission of the extrusion ball, thereby improving the accuracy of permeability detection of the exploration core sample 121.

[0086] Waste liquid generated from cleaning the formation pressure environment simulation material 122 enters the receiving tray 732 below the storage container 310. The solid-liquid separator in the receiving tray 732 can prevent the formation pressure environment simulation material 122 above from entering the receiving tray 732, while allowing the waste liquid to enter the receiving tray 732. The waste liquid entering the receiving tray 732 is pumped to the second filter 734 by the waste liquid recovery pump 733 for filtration treatment and then flows into the cleaning liquid container 710, thereby realizing the recycling of the cleaning liquid.

[0087] like Figure 1 As shown, a waste liquid recovery pump 733 is connected in series between the receiving plate 732 and the second filter 734. The strong suction of the waste liquid recovery pump 733 accelerates the flow rate of the cleaning fluid in the upper storage container 310, thereby improving the scouring effect of the cleaning fluid on the surface of the formation pressure environment simulation material 122, and further improving the removal of test fluid and impurities from the surface of the formation pressure environment simulation material 122. This, in turn, improves the cleaning effect of the cleaning mechanism and the accuracy of the permeability detection of the exploration core sample 121.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A core sample analysis device for oil and shallow gas exploration, characterized in that, include: The formation pressure simulation system includes a pressure vessel (110) and a pressure loading mechanism. The top of the pressure vessel (110) is open. The telescopic part of the pressure loading mechanism is used to enter and exit the pressure vessel (110) through the top of the pressure vessel (110). The outer peripheral surface of the telescopic part of the pressure loading mechanism is in sliding and sealing contact with the inner surface of the pressure vessel (110). The pressure vessel (110) is used to place a core sample (121) and formation pressure environment simulation material (122) wrapped around the core sample (121). The pressure vessel (110) is also provided with a liquid inlet, which connects the inner and outer sides of the pressure vessel (110). A permeability testing system includes a test liquid supply component and a flow detection device. The outlet of the test liquid supply component is connected to the inlet, and the flow detection device is mounted on the test liquid supply component. The control system includes an exhaust valve, a humidity detection device, a first pressure detection device, a second pressure detection device, and a controller. The exhaust valve, the humidity detection device, the first pressure detection device, the second pressure detection device, the test liquid supply assembly, and the pressure loading mechanism are all electrically connected to the controller. The exhaust valve is located on the telescopic part of the pressure loading mechanism, and when the exhaust valve is open, it connects the inner and outer sides of the pressure container (110). The detection end of the humidity detection device is located on the side of the telescopic part of the pressure loading mechanism near the inner side of the pressure container (110). The first pressure detection device is located inside the pressure container (110), and the second pressure detection device is located near the outlet end of the test liquid supply assembly. The controller is used to control the opening and closing of the exhaust valve according to the signal from the humidity detection device, the controller is used to control the start and stop of the pressure loading mechanism according to the signal from the first pressure detection device, and the controller is used to control the start and stop of the test liquid supply assembly according to the signal from the second pressure detection device.

2. The core sample analysis equipment for oil and shallow gas exploration according to claim 1, characterized in that, The test fluid supply assembly includes: Liquid storage container (210); A liquid supply pipeline is provided, with one end connected to the liquid storage container (210) and the other end connected to the liquid inlet of the pressure vessel (110). A booster pump (221) and a check valve (222) are sequentially arranged on the liquid supply pipeline from the liquid storage container (210) to the pressure vessel (110). The conduction direction of the check valve (222) is from the booster pump (221) to the pressure vessel (110). The second pressure detection device and the flow detection device are both arranged on the pipeline between the check valve (222) and the pressure vessel (110).

3. The core sample analysis equipment for oil and shallow gas exploration according to claim 2, characterized in that, It also includes a formation pressure environment simulation material supply component, the discharge end of which is located above the pressure vessel (110).

4. The core sample analysis equipment for oil and shallow gas exploration according to claim 3, characterized in that, The formation pressure environment simulation material supply assembly includes: A storage container (310) is provided with a material outlet at its bottom; The first conveying mechanism has its inlet end detachably connected to the material outlet or located below the material outlet, and its outlet end located above the pressure vessel (110).

5. The core sample analysis equipment for oil and shallow gas exploration according to claim 4, characterized in that, It also includes a material discharge assembly, wherein the bottom of the pressure vessel (110) is provided with a discharge port, and a first control valve is provided at the discharge port. The material discharge assembly includes: A solid-liquid separation pipeline (411) is provided with its top end connected to the discharge port. The solid-liquid separation pipeline (411) includes a horizontal section. The horizontal section of the solid-liquid separation pipeline (411) is provided with a downward-facing liquid diversion port. A filter device is provided at the liquid diversion port. The end of the horizontal section of the solid-liquid separation pipeline (411) away from the discharge port is a solid diversion port. A liquid discharge pipe (420) is connected at one end to the liquid diversion port and at the other end to the liquid storage container (210); The second feeding mechanism has its inlet end connected to or located below the solid diversion port, and its outlet end located above the storage container (310).

6. The core sample analysis equipment for oil and shallow gas exploration according to claim 1, characterized in that, The formation pressure environment simulation material (122) is a squeezed sphere, and the outside of the core sample (121) is also covered with a pressure dispersion sleeve (500). The pressure dispersion sleeve (500) is used to convert the point contact between the squeezed sphere and the core sample (121) into a surface contact between the pressure dispersion sleeve (500) and the core sample (121).

7. The core sample analysis equipment for oil and shallow gas exploration according to claim 2, characterized in that, The pressure vessel (110) is provided with a liquid inlet area, and the liquid inlet area is provided with a plurality of liquid inlets. A dispersive liquid supply element (223) is provided at one end of the liquid supply pipeline connected to the pressure vessel (110). The dispersive liquid supply element (223) covers the liquid inlet area, and a mesh plate is provided inside the dispersive liquid supply element (223).

8. The core sample analysis equipment for oil and shallow gas exploration according to claim 5, characterized in that, The storage container (310) includes at least two, and the multiple storage containers (310) are connected one-to-one to multiple planetary gears (630) of the planetary gear mechanism. The discharge end of the second conveying mechanism and the feed end of the first conveying mechanism are both located on the revolution trajectory of the storage container (310).

9. The core sample analysis equipment for oil and shallow gas exploration according to claim 8, characterized in that, It also includes a cleaning mechanism, wherein the cleaning fluid inlet and the cleaning fluid return outlet of the cleaning mechanism are both located on the orbital trajectory of the storage container (310), and the cleaning fluid inlet of the cleaning mechanism is located above the corresponding storage container (310). The cleaning fluid return outlet of the cleaning mechanism is used to be detachably connected to the material outlet of the corresponding storage container (310).

10. The core sample analysis equipment for oil and shallow gas exploration according to claim 9, characterized in that, The cleaning mechanism includes: Cleaning fluid container (710); A cleaning fluid pumping pipeline, one end of which is connected to the cleaning fluid container (710), and the other end of which is provided with a spraying disc (723), and the spraying disc (723) is suspended above the orbital trajectory of the storage container (310). Waste liquid recovery pipeline, one end of which is detachably connected to the material outlet of one of the storage containers (310) via a solid-liquid separator, and the other end is connected to the cleaning liquid container (710).

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