Method and system for manufacturing artificial cores containing fractures

Abstract

The embodiment of the present application provides a kind of containing fracture artificial core manufacturing method and system, the system includes: control device, core manufacturing mold, core manufacturing device;The core manufacturing mold includes the clamping groove fixed in the inner surface of core manufacturing mold;The thickness of the clamping groove corresponds to the width of preset alloy piece;The alloy piece corresponds to the shape of target fracture;The control device is used to fill the filling for solidification into the core manufacturing mold, and the filled core manufacturing mold is moved to core manufacturing device;The core manufacturing device is used to solidify the filled core manufacturing mold and carry out heating treatment to generate corresponding artificial core containing fracture.The artificial core containing fracture manufacturing system of the embodiment of the present application generates the fracture in the artificial core containing fracture, and the matching degree of the fracture in the artificial core containing fracture is higher, so that the accuracy of the fracture in the artificial core containing fracture is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of oil and gas exploration and development, and particularly relate to a manufacturing method and system of a man-made core containing fractures. BACKGROUND

[0002] In the development process of fractured oil and gas reservoirs, it is often necessary to study the percolation characteristics and development mechanism of oil, gas and water through core experiments. However, drilling cores has the problems of high cost, being limited by the location of coring wells and geological conditions, and the core recovery rate may not reach 100%, the core may be damaged or dropped, and it is very difficult and costly to obtain the required core. Therefore, it is necessary to artificially simulate the geological environment in the laboratory in combination with regional geological characteristics to produce man-made cores containing fractures to meet the needs of scientific experimental research.

[0003] Currently, man-made cores containing fractures are mainly produced by decomposing starch barriers in cores with an enzyme aqueous solution, and fractures are generated after heating. The fractures generated in this way have randomness and low matching degree with actual fractures. SUMMARY

[0004] The present application provides a manufacturing method and system of a man-made core containing fractures to solve the problem of low matching degree between the man-made core containing fractures produced at present and actual fractures.

[0005] The first aspect of the embodiments of the present application provides a manufacturing system of a man-made core containing fractures, which comprises:

[0006] a control device, a core manufacturing mold, and a core manufacturing device; the core manufacturing mold comprises a clamping groove fixed on the inner surface of the core manufacturing mold; the thickness of the clamping groove corresponds to the width of a preset alloy piece; the alloy piece corresponds to the shape of a target fracture;

[0007] The control device is used to obtain the inclination angle of the target fracture, and insert one end of the alloy piece into the clamping groove of the core manufacturing mold; the angle between the alloy piece and the clamping groove is the inclination angle;

[0008] The control device is used to fill the core manufacturing mold with a filling material for solidification, and move the filled core manufacturing mold to the core manufacturing device;

[0009] The core manufacturing device is used to solidify and demold the filled core manufacturing mold and perform heating treatment to generate a corresponding man-made core containing fractures.

[0010] Further, the system as described above, the core manufacturing device comprises a heating device and a solidification and demolding device;

[0011] The solidification and demolding device is used for solidification and demolding of the filled core manufacturing mold, generating a corresponding artificial core containing an alloy part, and moving the artificial core containing the alloy part to the heating device.

[0012] The heating device is used for heating the artificial core containing the alloy part according to a preset heating temperature and a preset heating time, to generate a corresponding artificial core containing a crack.

[0013] Further, the system as described above, the solidification and demolding device comprises a pressure testing machine and an incubator;

[0014] The pressure testing machine is used for pressurizing the filled core manufacturing mold according to a preset pressurizing time and a preset pressure, and moving the pressurized core manufacturing mold to the incubator;

[0015] The incubator is used for constant temperature treatment of the pressurized core manufacturing mold according to a preset constant temperature and a preset constant temperature time, to generate a corresponding artificial core containing an alloy part.

[0016] Further, the system as described above, the alloy part is an alloy with a melting point less than 140℃; the thickness of the alloy part is 1-5mm; the alloy part includes any one of the following:

[0017] Tin bismuth alloy, gallium tin alloy, gallium aluminum alloy, gallium bismuth alloy, lead tin alloy.

[0018] Further, the system as described above, the clamping groove is parallel to the inner surface of the bottom of the core manufacturing mold;

[0019] The control device is specifically used for:

[0020] The control device penetrates the alloy part from above the clamping groove through the clamping groove and extends to contact the inner surface of the bottom of the core manufacturing mold.

[0021] Further, the system as described above, the filler is a mixture of quartz sand and epoxy resin;

[0022] The ratio between the quartz sand and the epoxy resin ranges from 4 to 9.

[0023] Further, the system as described above, the control device comprises a control unit and a mechanical arm;

[0024] The control device is specifically used for:

[0025] The control unit controls the mechanical arm to fill a first proportion mixture with a preset first volume into a bottom layer of the core manufacturing mold;

[0026] fill a second proportion mixture with a preset second volume into the core manufacturing mold;

[0027] fill a third proportion mixture with a preset third volume into the core manufacturing mold.

[0028] Further, the system as described above, the system further comprises: an alloy piece manufacturing device;

[0029] The alloy piece manufacturing device is used to obtain the spread shape, width, length and original alloy of the target crack, and generate a corresponding alloy piece according to the original alloy, spread shape, width and length.

[0030] Further, the system as described above, the system further comprises: a weighing device;

[0031] The weighing device is in communication connection with the control device;

[0032] The weighing device is used to weigh the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the crack, and send the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the crack to the control device;

[0033] The control device is further used to determine whether there is alloy piece residue in the artificial core containing the crack according to the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the crack, and if there is alloy piece residue in the artificial core containing the crack, move the artificial core containing the crack to the core manufacturing device to make the core manufacturing device perform heating treatment on the artificial core containing the crack.

[0034] The second aspect of the embodiment of the present application provides a manufacturing method of an artificial core containing a crack, based on the manufacturing system of the artificial core containing the crack of any one of the first aspect, the method comprises:

[0035] The control device obtains the inclination angle of the target crack, and inserts one end of the alloy piece into the clamping groove of the core manufacturing mold; the angle between the alloy piece and the clamping groove is the inclination angle;

[0036] The control device fills the core manufacturing mold with the filling for solidification, and moves the filled core manufacturing mold to the core manufacturing device;

[0037] The core manufacturing device solidifies and demolds the filled core manufacturing mold and heats it to generate a corresponding artificial core containing cracks.

[0038] This invention provides a method and system for manufacturing an artificial rock core containing cracks. The system includes a control device, a core manufacturing mold, and a core manufacturing device. The core manufacturing mold includes a groove fixed to its inner surface. The thickness of the groove corresponds to the width of a preset alloy component. The alloy component corresponds to the shape of a target crack. The control device is used to obtain the inclination angle of the target crack and insert one end of the alloy component into the groove of the core manufacturing mold. The angle between the alloy component and the groove is the inclination angle. The control device is used to fill the core manufacturing mold with a filler for curing and move the filled core manufacturing mold to the core manufacturing device. The core manufacturing device is used to cure, demold, and heat-treat the filled core manufacturing mold to generate a corresponding artificial rock core containing cracks. This invention's system for manufacturing an artificial rock core containing cracks combines the alloy component, the core manufacturing mold, and the filler according to the characteristics of the target crack using a control device, and then moves the combined core manufacturing mold to the core manufacturing device to generate a corresponding artificial rock core containing cracks. Since the shape of the alloy part in the embodiment of the present invention corresponds to that of the target crack, and the angle between the alloy part and the slot is the inclination angle of the target crack, the crack in the artificial rock core containing cracks generated after the alloy part is heated and melted has a higher matching degree with the actual target crack, thereby improving the accuracy of the crack in the artificial rock core containing cracks. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0040] Figure 1 A schematic diagram of the manufacturing system for an artificial rock core containing cracks provided in the first embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the manufacturing system for an artificial rock core containing cracks provided in the second embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the manufacturing system for an artificial rock core containing cracks, provided in the third embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the manufacturing system for an artificial rock core containing cracks, provided in the fourth embodiment of the present invention.

[0044] Figure 5Structure diagram of core manufacturing mold of manufacturing system of artificial core containing cracks provided by the fourth embodiment of the present application;

[0045] Figure 6 Structure diagram of core manufacturing mold of manufacturing system of artificial core containing cracks provided by the fourth embodiment of the present application;

[0046] Figure 7 Flowchart of manufacturing method of artificial core containing cracks provided by the fifth embodiment of the present application.

[0047] Symbol explanation:

[0048] 10, control device; 20, core manufacturing mold; 21, clamping groove; 30, core manufacturing device; 31, solidification demolding device; 33, heating device; 40, alloy piece manufacturing device; 50, weighing device; 60, alloy piece; 70, artificial core containing cracks; 80, cracks.

[0049] The specific embodiments of the present application have been shown and described in the above-described drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] Exemplary embodiments will be described in detail herein below, with examples shown in the drawings. In the following description, the same numbers in different drawings represent the same or similar elements unless otherwise represented. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0051] The technical solutions of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0052] In order to facilitate better understanding of the manufacturing system of the artificial core containing the crack provided by the embodiment of the present application, the following will introduce the existing manufacturing method of the artificial core containing the crack. The existing manufacturing method of the artificial core containing the crack mainly has the following methods. One is through a triaxial stretching system, by changing the applied pressure to simulate the ground stress during the crack formation process, and then to realize the artificial crack core. This method cannot guarantee that the crack formed by the artificial core is the deterministic crack required by the experiment, and has certain uncertainty and contingency, which will lead to the deviation of the experimental results. Two is to use a degraded enzyme aqueous solution to decompose the starch layer in the core, and generate cracks after heating. The cracks generated by this method have randomness, and the matching degree with the actual crack is low.

[0053] In order to solve the problem that the matching degree of the crack of the artificial core generated by the existing manufacturing method of the artificial core containing the crack with the actual target crack is low, the inventors found in the research that in order to solve the problem that the matching degree of the crack of the artificial core generated by the existing manufacturing method of the artificial core containing the crack with the actual target crack is low, the parameters such as the inclination and width of the actual target crack can be obtained, the alloy piece matched with the actual crack is inserted into the clamping groove of the core manufacturing mold, and then the corresponding artificial core containing the crack is generated through solidification demolding and heating treatment. Specifically, first, the one end of the alloy piece is inserted into the clamping groove of the core manufacturing mold through the control device, wherein the angle between the alloy piece and the clamping groove is the inclination of the target crack, and then the control device fills the filler for solidification into the core manufacturing mold, and moves the filled core manufacturing mold to the core manufacturing device to generate the corresponding artificial core containing the crack. Since the alloy piece of the embodiment of the present application corresponds to the shape of the target crack, and the angle between the alloy piece and the clamping groove is the inclination of the target crack, the crack in the artificial core containing the crack generated after the alloy piece is melted by heating has a higher matching degree with the actual target crack, and the accuracy of the crack in the artificial core containing the crack is improved.

[0054] The following will introduce the embodiment of the present application in combination with the drawings of the specification.

[0055] Figure 1 The manufacturing system of the artificial core containing the crack provided by the first embodiment of the present application is shown in the structure schematic diagram of the figure, and the connection line represents the association relationship between each device, and is not the actual connection relationship. As shown in the figure, Figure 1 The manufacturing system of the artificial core containing the crack provided by the embodiment of the present application includes:

[0056] The control device 10, the core manufacturing mold 20 and the core manufacturing device 30. The core manufacturing mold 20 includes a clamping groove fixed on the inner surface of the core manufacturing mold 20. The thickness of the clamping groove corresponds to the width of the preset alloy piece, and the alloy piece corresponds to the shape of the target crack.

[0057] The control device 10 is used to obtain the dip angle of the target fracture, and insert one end of the alloy piece into the clamping groove of the core manufacturing mold 20. The angle between the alloy piece and the clamping groove is the dip angle.

[0058] Meanwhile, the control device 10 is used to fill the core manufacturing mold 20 with the filler for curing, and move the filled core manufacturing mold 20 into the core manufacturing device 30.

[0059] The core manufacturing device 30 is used to cure and demold the filled core manufacturing mold 20 and perform heating treatment to generate a corresponding artificial core containing a fracture.

[0060] In this embodiment, the control device 10 can include a control unit and a mechanical arm, etc., the control unit is used to obtain the dip angle of the target fracture, and the mechanical arm is used to perform specific actions and movements. The mechanical arm can insert one end of the alloy piece into the clamping groove of the core manufacturing mold 20, and move the loading device containing the filler for curing to above the core manufacturing mold 20, then slowly pour the filler into the core manufacturing mold 20, and finally fill the core manufacturing mold 20 with the filler.

[0061] In this embodiment, the alloy piece can be pre-manufactured, and the shape of the alloy piece corresponds to the shape of the target fracture, and the shape of the target fracture includes conjugate "X" type shear fracture, network fracture, high-angle fracture, low-angle fracture, etc. If the shape of the target fracture is relatively complex, multiple alloy pieces can be used to combine the shape of the target fracture.

[0062] The alloy piece can use an alloy with a low melting point and no harmful gas generated when heated, thereby reducing the required conditions of the experimental equipment, and no harmful gas is generated when the alloy is heated and melted, thereby improving the safety during manufacturing.

[0063] In this embodiment, the clamping groove can be parallel to the inner surface of the core manufacturing mold 20, or can be at a certain angle, and can also be fixed according to the actual fracture requirements.

[0064] In this embodiment, the thickness of the core manufacturing mold 20 is 2-5 cm, and the material of the mold is pressure-resistant stainless steel to ensure that it will not deform under a pressing condition of 5-20 MPa. The size of the mold is matched with the size and shape of the alloy piece. The clamping groove can also be pre-cut in the core manufacturing mold 20, and the inner surface of the mold can be cut according to the designed shape of the alloy piece. The clamping groove clamps the alloy piece in the clamping groove to prevent displacement of the alloy piece during subsequent filling of the filler, and the use of the clamping groove also ensures that the mold is easy to demold after being pressed and formed, and the mold can be pulled out along the clamping groove to achieve demolding.

[0065] In this embodiment, the size of the artificial core containing cracks is usually selected as 100cm*50cm*50cm, and the moderate size can facilitate subsequent experimental research.

[0066] The manufacturing system of the artificial core containing cracks provided in the embodiment of the present application comprises a control device 10, a core manufacturing mold 20, and a core manufacturing device 30. The core manufacturing mold 20 comprises a clamping groove fixed to the inner surface of the core manufacturing mold 20. The thickness of the clamping groove corresponds to the width of a preset alloy piece, and the alloy piece corresponds to the shape of a target crack. The control device 10 is used to obtain the inclination angle of the target crack, and insert one end of the alloy piece into the clamping groove of the core manufacturing mold 20. The angle between the alloy piece and the clamping groove is the inclination angle. The control device 10 is used to fill the core manufacturing mold 20 with a filler for solidification, and move the filled core manufacturing mold 20 to the core manufacturing device 30. The core manufacturing device 30 is used to solidify, demold, and heat treat the filled core manufacturing mold 20 to generate a corresponding artificial core containing cracks. The manufacturing system of the artificial core containing cracks in the embodiment of the present application combines the alloy piece, the core manufacturing mold 20, and the filler according to the characteristics of the target crack through the control device 10, and then moves the combined core manufacturing mold 20 to the core manufacturing device 30 to generate a corresponding artificial core containing cracks. Since the alloy piece in the embodiment of the present application corresponds to the shape of the target crack, and the angle between the alloy piece and the clamping groove is the inclination angle of the target crack, the crack in the artificial core containing cracks generated after the alloy piece is melted by heating has a higher matching degree with the actual target crack, and the accuracy of the crack in the artificial core containing cracks is improved.

[0067] Figure 2 The manufacturing system of the artificial core containing cracks provided in the second embodiment of the present application is shown in the structural schematic diagram, wherein the connection lines represent the association relationship between each device, and are not intended to represent the actual connection relationship. As shown in the figure, Figure 2 The manufacturing system of the artificial core containing cracks provided in the embodiment is further refined on the basis of the manufacturing system of the artificial core containing cracks provided in the previous embodiment, and the manufacturing system of the artificial core containing cracks provided in the embodiment further comprises the following technical solutions.

[0068] Optionally, in the embodiment, the core manufacturing device 30 comprises a heating device 33 and a solidification and demolding device 31.

[0069] The solidification and demolding device 31 is used to solidify and demold the filled core manufacturing mold 20 to generate a corresponding artificial core containing the alloy piece, and move the artificial core containing the alloy piece to the heating device 33.

[0070] The heating device 33 is used to heat the artificial core containing the alloy piece according to a preset heating temperature and a preset heating time, so as to generate a corresponding artificial core containing a crack.

[0071] In this embodiment, the solidification and demolding device 31 is used to solidify and demold the filled core manufacturing mold 20. After the solidification and demolding are completed, the artificial core at this time contains the alloy piece. If the artificial core containing a crack is required, the heating device 33 is used to heat the artificial core, so that the alloy piece is melted and the artificial core is left.

[0072] The heating temperature is slightly higher than the melting point of the alloy piece by 10-20℃. When the melting point of the alloy piece is 130℃, the heating temperature can be selected as 140-150℃. Meanwhile, the heating time can be selected as 30 minutes, so that the alloy piece is completely melted.

[0073] Optionally, in this embodiment, the solidification and demolding device 31 includes a pressure testing machine and an incubator.

[0074] The pressure testing machine is used to pressurize the filled core manufacturing mold 20 according to a preset pressurization time and a preset pressure, and move the pressurized core manufacturing mold 20 to the incubator.

[0075] The incubator is used to perform constant temperature treatment on the pressurized core manufacturing mold 20 according to a preset constant temperature and a preset constant temperature time, so as to generate a corresponding artificial core containing an alloy piece.

[0076] In this embodiment, the preset pressure can be a pressure of 5-20MPa, and the pressurization time can be 10-30 minutes. The pressure and the time of pressurization can also be determined according to the properties of the artificial core, for example, 20 minutes of pressurization under a pressure of 10MPa, or 30 minutes of pressurization under a pressure of 5MPa. The incubator is used to maintain a constant temperature for the pressurized core manufacturing mold 20, so that the core manufacturing mold 20 is solidified. After the core manufacturing mold 20 is solidified, a demolding operation can be performed, so as to generate a corresponding artificial core containing an alloy piece.

[0077] Optionally, in this embodiment, the clamping groove is parallel to the inner surface of the bottom of the core manufacturing mold 20.

[0078] The control device 10 is specifically used to:

[0079] The control device 10 penetrates the clamping groove from above the clamping groove with one end of the alloy piece, and extends to contact the inner surface of the bottom of the core manufacturing mold 20.

[0080] In this embodiment, when the clamping groove is parallel to the inner surface of the bottom of the core manufacturing mold 20, one end of the alloy piece can be more conveniently inserted through the clamping groove from above the clamping groove and extended to be in contact with the inner surface of the bottom of the core manufacturing mold 20. The one end of the alloy piece is extended to be in contact with the inner surface of the bottom of the core manufacturing mold 20 so as to form an outflow channel when the alloy piece is melted. At the same time, the bottom of the core manufacturing mold 20 can also be reserved with an opening of the outflow channel to facilitate the alloy piece to flow out of the core manufacturing mold 20 after being melted. At the same time, a certain pressure of inert gas can be introduced to purge the liquid after the alloy piece is melted, so that the liquid can flow out more quickly and completely.

[0081] Optionally, in this embodiment, the filler is a mixture of quartz sand and epoxy resin.

[0082] The ratio between the quartz sand and the epoxy resin ranges from 4 to 9.

[0083] In this embodiment, the mass ratio of the quartz sand and the epoxy resin can be 8-9:1-2, and the diameter of the quartz sand is 0.05-0.50mm. Optionally, the mass ratio of the quartz sand and the epoxy resin is 8:2, the diameter of the quartz sand is 0.05-0.50mm, preferably 0.10-0.30mm, the content of SiO2 in the quartz sand is ≥95%, and the content of SiO2 is preferably 97%-99%, which is more in line with the hardness requirement of the core and is easier to shape after being mixed with the epoxy resin.

[0084] Optionally, in this embodiment, the control device 10 comprises a control unit and a mechanical arm.

[0085] The control device 10 is specifically used for:

[0086] The control unit controls the mechanical arm to fill the first proportion mixture of a preset first capacity into the bottom layer of the core manufacturing mold 20.

[0087] The second proportion mixture of a preset second capacity is filled into the core manufacturing mold 20.

[0088] The third proportion mixture of a preset third capacity is filled into the core manufacturing mold 20.

[0089] In this embodiment, the first proportion mixture of the preset first capacity, the second proportion mixture of the preset second capacity, and the third proportion mixture of the preset third capacity can be set according to actual requirements.

[0090] Meanwhile, in order to fill uniformly and densely, the mixture can be filled into the mold in layers, preferably three layers in turn, taking the fixed alloy piece in the mold as a rough demarcation point, the space below the alloy piece as the lower layer, the space occupied by the alloy piece as the middle layer, and the space above the alloy piece as the upper layer. In actual operation, the layers do not need to be controlled very accurately, but only serve as a reference for operation. How to fill in layers does not significantly affect the quality of the final artificial core. When pouring the mixture, the mixture is first slowly poured into the lower layer of the mold, and continuously pressed by a mechanical arm or manually during the pouring process until the mixture contacts the alloy piece body. Stop pouring the mixed sand, scrape and compact it, then slowly pour the mixed sand into the alloy piece area of the middle layer, and continuously press during the pouring process until the mixed sand is above the alloy piece body. Note that the pressing should not damage the shape of the alloy piece. If the alloy piece structure is complex, the pouring speed needs to be slowed down, and the number of pressing operations needs to be increased to fill every pore of the alloy piece as much as possible and compact it. Then scrape and compact it. Finally, slowly pour the mixed sand into the upper layer of the alloy piece, and continuously press during the pouring process until the mixed sand fills the mold. Then scrape and compact it. If there is still excess after compaction, continue to slowly pour the mixed sand until the mixed sand fills the mold after compaction. Scrape the top surface of the mold and clean the surrounding excess mixture.

[0091] Please refer to Figure 3 , Figure 3 The figure shows the connection between each device, not the actual connection relationship.

[0092] Optionally, in this embodiment, the system further comprises an alloy piece manufacturing device 40.

[0093] The alloy piece manufacturing device 40 is used to obtain the spread shape, width, length of the target crack, and the original alloy, and generate a corresponding alloy piece according to the original alloy, spread shape, width, and length.

[0094] In this embodiment, when the alloy piece is made by the alloy piece manufacturing device 40, the spread shape of the crack in the mold can be designed according to the crack parameters such as the spread shape of the target crack, for example, a mesh-shaped crack or a parallel high-angle crack. Then the alloy sheet is cut into the appropriate size, the corresponding arc is pressed out, the corresponding clamping slot is cut on each alloy piece, and then the alloy pieces are assembled. Thus, the actual spread shape of the actual crack is simulated by assembling multiple alloy pieces. Meanwhile, if a single alloy piece can achieve simulation, the alloy sheet is cut into the appropriate size, and the corresponding arc is pressed out.

[0095] Optionally, in the embodiment, the alloy piece is an alloy with a melting point less than 140℃. The thickness of the alloy piece is 1-5mm. The alloy piece comprises any one of the following:

[0096] Tin bismuth alloy, gallium tin alloy, gallium aluminum alloy, gallium bismuth alloy, lead tin alloy.

[0097] In the embodiment, the alloy piece is made of an alloy material with low melting point, high hardness and high pressure resistance. The melting point of the alloy piece is less than 140℃, preferably 100-120℃. The alloy in this range can be melted at a lower temperature, so it is easy to flow out later, and the performance of the artificial core will not be affected by too high temperature. The thickness of the alloy material is controlled to be 1-5mm, so that it can be easily shaped, but it is not easy to deform during later pressing. The alloy piece uses any one of tin bismuth alloy, gallium tin alloy, gallium aluminum alloy, gallium bismuth alloy and lead tin alloy, so that harmful gas will not be generated during subsequent heating and melting of the alloy piece.

[0098] Please refer to Figure 4 , Figure 4 The manufacturing system structure schematic diagram of the artificial core with cracks provided by the fourth embodiment of the present application is shown in the figure, the connection line represents the association relationship between each device, and is not the actual connection relationship.

[0099] Optionally, in the embodiment, the system further comprises a weighing device 50.

[0100] The weighing device 50 is in communication connection with the control device 10.

[0101] The weighing device 50 is used to weigh the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing cracks, and send the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing cracks to the control device 10.

[0102] The control device 10 is also used to determine whether there is residual alloy piece in the artificial core containing cracks according to the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing cracks. If there is residual alloy piece in the artificial core containing cracks, the artificial core containing cracks is moved to the core manufacturing device 30, so that the core manufacturing device 30 performs heating treatment on the artificial core containing cracks.

[0103] In this embodiment, the weighing device 50 can weigh the weight of the alloy piece in advance, and weigh the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the fracture, so as to determine whether the artificial core containing the fracture has alloy piece residues. For example, if the weight of the alloy piece is 7 kg, the weight of the artificial core containing the alloy piece is 350 kg, and the weight of the artificial core containing the fracture is 345 kg, it means that the artificial core containing the fracture has alloy piece residues, and secondary heating is needed to make the alloy piece melt out completely.

[0104] The manufacturing system of the artificial core containing the fracture in this embodiment obtains the fracture parameters of the target fracture, uses a low-melting-point alloy to make an alloy piece corresponding to the target fracture, and fixes the alloy piece in the core manufacturing mold 20. Then, the core manufacturing mold 20 is filled with a mixture of quartz sand and epoxy resin in a corresponding proportion in different areas by the mechanical arm, so as to simulate a core manufacturing mold 20 to be cured and demolded which is more matched with the actual core environment and the actual fracture. After the core manufacturing mold 20 to be cured and demolded is cured and demolded, the alloy piece can be melted and flowed out only by heating at a temperature higher than the melting point of the alloy piece, and the artificial core containing the fracture is obtained. The method in this embodiment can accurately control the fracture distribution pattern of the artificial core, avoid over-high-temperature firing of the artificial core, reduce the required conditions of the experimental equipment, and will not produce harmful gas when the alloy is heated and melted.

[0105] In order to more conveniently understand the manufacturing system of the artificial core containing the fracture of the present application, the manufacturing process of the artificial core containing the fracture will be described in more detail below.

[0106] Please refer to Figure 5 and Figure 6 , for a certain fracture in a certain area, first, according to the actual oil and gas reservoir characteristics, the target fracture parameters of the target area are obtained through imaging logging or coring observation, the fracture length is 0.1-1 m, the opening is 0.3-3 mm, the dip angle is 50°-80°, and the distribution pattern is a network fracture. According to these fracture parameters, an alloy piece 60 corresponding to the fracture pattern is made by cutting, bending, and thinning an alloy piece manufacturing device using an alloy piece with a low melting point of 138℃ and a thickness of 0.5-2 mm, and then the alloy piece 60 is weighed by an electronic scale, and the mass is 7.7 kg.

[0107] The core manufacturing mold 20 is made of pressure-resistant alloy steel with a wall thickness of 5 cm, and is made into a square steel mold matched with the alloy piece 60, and a clamping groove 21 corresponding to the alloy piece is cut around the square steel mold. Then, the obtained alloy piece is fixed in the square steel mold through the clamping groove 21, as shown in Figure 5 .

[0108] The matrix was selected as a low-porosity simulated formation with a porosity of 5%–10% and a permeability of 0.05 mD–1 mD. Based on the physical properties of the artificial core, quartz sand with a particle size of 0.1–0.5 mm was mixed with epoxy resin at a mass ratio of 8:2 to obtain a mixed sand. The mixed sand was slowly poured into the core manufacturing mold 20, pressing continuously during the pouring process until the mixed sand contacted the main body of the alloy part 60. The pouring was then stopped, and the mixture was leveled and compacted with a scraper. The mixed sand was then slowly poured in again, pressing continuously during the pouring process until the mixed sand covered the alloy part 60. The mixed sand was carefully pressed, taking care not to damage the shape of the alloy part, and the mixed sand was made to fill every pore of the alloy part 60 as much as possible. Then it was carefully compacted, and the mixed sand was slowly poured in again, pressing continuously during the pouring process until the mold was full. The mixture was then leveled and compacted, the top surface of the mold was smoothed, and excess mixture around it was cleaned up.

[0109] Place the mold on a pressure testing machine, apply a pressure of 10 MPa, maintain the pressure for 20 minutes, remove the mold, and place it in a constant temperature chamber at 25℃ for about 5 to 6 hours. After curing, demold to obtain an artificial rock core containing alloy parts.

[0110] The artificial rock core containing alloy parts was placed on an electronic scale and weighed. Its mass was 352.7 kg.

[0111] The artificial rock core containing the alloy parts is placed vertically on a heat-resistant support along the direction of the alloy parts, and then placed in an oven for heating. The temperature is set to 138℃ and the time is more than 30 minutes. After the alloy parts are completely melted, the molten alloy slowly flows out. It is then purged with inert gas until no more molten alloy flows out. The oven is then closed, and the core is removed after the temperature drops to obtain an artificial rock core containing cracks.

[0112] The artificial rock core 70 containing cracks was weighed on an electronic scale, and its mass was 345 kg. This indicates that the alloy component has completely melted and flowed out, resulting in an artificial rock core containing cracks that meets the requirements.

[0113] As required by the experiment, a cylindrical artificial rock core containing cracks was drilled from the artificial rock core containing cracks using a drilling tool, and then tested.

[0114] The artificial rock core containing cracks, manufactured using the method described in this embodiment, was tested and found to have a crack aperture > 0.3 mm and an internal mesh-like crack pattern. Figure 6 As shown. Through conventional porosity and permeability tests, as well as relative permeability experiments, the experimental results showed that the error between the results and the actual core test results was within ±15%, indicating that the artificial core containing cracks produced by the method of this invention met the experimental requirements.

[0115] The embodiment also provides a manufacturing method of the artificial core containing the crack. Figure 7 , Figure 7 A flowchart of the manufacturing method of the artificial core containing the crack provided by the fifth embodiment of the present application is shown in the figure. The manufacturing method of the artificial core containing the crack of the embodiment comprises the following steps.

[0116] In step S101, the control device acquires the inclination angle of the target crack, and inserts one end of the alloy piece into the clamping groove of the core manufacturing mold. The angle between the alloy piece and the clamping groove is the inclination angle.

[0117] In step S102, the control device fills the core manufacturing mold with the filler for solidification, and moves the filled core manufacturing mold to the core manufacturing device.

[0118] In step S103, the core manufacturing device performs solidification demolding and heating treatment on the filled core manufacturing mold to generate the corresponding artificial core containing the crack.

[0119] In the manufacturing method of the artificial core containing the crack provided by the embodiment, the structure and function of the manufacturing system of the artificial core containing the crack are similar to those of the manufacturing system of the artificial core containing the crack provided by any one of the first to fourth embodiments of the present application, and will not be described here.

[0120] The manufacturing method of the artificial core containing the crack provided by the embodiment of the present application comprises the following steps. In step S101, the control device acquires the inclination angle of the target crack, and inserts one end of the alloy piece into the clamping groove of the core manufacturing mold. The angle between the alloy piece and the clamping groove is the inclination angle. In step S102, the control device fills the core manufacturing mold with the filler for solidification, and moves the filled core manufacturing mold to the core manufacturing device. In step S103, the core manufacturing device performs solidification demolding and heating treatment on the filled core manufacturing mold to generate the corresponding artificial core containing the crack.

[0121] The method of the embodiment of the present application combines the alloy piece, the core manufacturing mold and the filler according to the characteristics of the target crack through the control device, and then moves the combined core manufacturing mold to the core manufacturing device to generate the corresponding artificial core containing the crack. Since the alloy piece of the embodiment of the present application corresponds to the shape of the target crack, and the angle between the alloy piece and the clamping groove is the inclination angle of the target crack, the crack in the artificial core containing the crack generated after the alloy piece is heated and melted has a higher matching degree with the actual target crack, and the accuracy of the crack in the artificial core containing the crack is improved.

[0122] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application embrace any and all variations of the embodiments of the application described herein that fall within the scope of the present application. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0123] It is to be understood that the application is not limited to the precise construction herein described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be indicated by the appended claims, rather than the embodiments given herein, which are intended as exemplary only.

Claims

1. A system for manufacturing an artificial core having a fracture, characterized by, The application relates to a control device, a core manufacturing mold and a core manufacturing device. The core manufacturing mold comprises a clamping groove fixed to the inner surface of the core manufacturing mold. The thickness of the clamping groove corresponds to the width of a preset alloy piece. The alloy piece corresponds to the shape of a target crack. The alloy piece is an alloy with a melting point less than 140 DEG C and without harmful gas generated when heated. The alloy piece can be melted into liquid state under heating condition and flows out of the artificial core. The control device is used to obtain the inclination angle of the target crack and insert one end of the alloy piece into the clamping groove of the core manufacturing mold. The angle between the alloy piece and the clamping groove is the inclination angle. The clamping groove is configured to fix the alloy piece during the solidification demolding process and maintain the shape of the alloy piece before the heating treatment.

2. The system of claim 1, wherein, The control device is used to fill the core manufacturing mold with a filling material for solidification and move the filled core manufacturing mold to the core manufacturing device. The core manufacturing device is used to perform solidification demolding and heating treatment on the filled core manufacturing mold to generate a corresponding artificial core containing a crack. One end of the alloy piece extends to the inner surface of the bottom of the core manufacturing mold to form a channel for the molten alloy to flow out.

3. The system of claim 1, wherein, The core manufacturing device comprises a heating device and a solidification demolding device. The solidification demolding device is used to perform solidification demolding on the filled core manufacturing mold to generate a corresponding artificial core containing the alloy piece and move the artificial core containing the alloy piece to the heating device.

4. The system of any one of claims 1 to 3, wherein, The heating device is used to heat the artificial core containing the alloy piece according to a preset heating temperature and a preset heating time to generate a corresponding artificial core containing a crack. The solidification demolding device comprises a pressure testing machine and an incubator. The pressure testing machine is used to pressurize the filled core manufacturing mold according to a preset pressurization time and a preset pressure and move the pressurized core manufacturing mold to the incubator.

5. The system of claim 1, wherein, The incubator is used to perform constant temperature treatment on the pressurized core manufacturing mold according to a preset constant temperature and a preset constant temperature time to generate a corresponding artificial core containing the alloy piece. The thickness of the alloy piece is 1-5 mm.

6. The system of claim 5, wherein, The alloy piece comprises any one of the following: Tin-bismuth alloy, gallium-tin alloy, gallium-aluminum alloy, gallium-bismuth alloy and lead-tin alloy. The clamping groove is parallel to the inner surface of the bottom of the core manufacturing mold. When the control device inserts the alloy piece into the clamping groove of the core manufacturing mold, the control device is specifically used to: The control device inserts one end of the alloy piece into the clamping groove from above the clamping groove and extends to the inner surface of the bottom of the core manufacturing mold. The filling material is a mixture of quartz sand and epoxy resin. The ratio between the quartz sand and the epoxy resin ranges from 4 to 9. The control device comprises a control unit and a mechanical arm. When the control device fills the core manufacturing mold with the filling material for solidification, the control device is specifically used to: The control unit controls the mechanical arm to fill a preset first volume of a first ratio mixture into the bottom layer of the core manufacturing mold. filling a second proportion mixture with a preset second volume into the core manufacturing mold; filling a third proportion mixture with a preset third volume into the core manufacturing mold.

7. The system of claim 1, wherein, Further comprising: an alloy piece manufacturing device; the alloy piece manufacturing device is used to obtain the propagation shape, width, length and original alloy of the target crack, and generate a corresponding alloy piece according to the original alloy, propagation shape, width and length.

8. The system of claim 1, wherein, Further comprising: a weighing device; the weighing device is in communication connection with the control device; the weighing device is used to weigh the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the crack, and send the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the crack to the control device; the control device is further used to determine whether there is residual alloy piece in the artificial core containing the crack according to the weight of the alloy piece, the weight of the artificial core containing the alloy piece and the weight of the artificial core containing the crack, and if there is residual alloy piece in the artificial core containing the crack, move the artificial core containing the crack to the core manufacturing device to make the core manufacturing device perform heating treatment on the artificial core containing the crack.

9. A method of manufacturing an artificial core having a fracture, characterized by, The manufacturing system of the artificial core containing the crack according to any one of claims 1 to 8, the method comprising: the control device obtains the inclination angle of the target crack, and inserts one end of the alloy piece into the clamping groove of the core manufacturing mold; the angle between the alloy piece and the clamping groove is the inclination angle; the control device fills the core manufacturing mold with the filler for solidification, and moves the filled core manufacturing mold to the core manufacturing device; the core manufacturing device performs solidification demolding and heating treatment on the filled core manufacturing mold to generate a corresponding artificial core containing the crack.

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