Preparation process of artificial long-strip core electrode

Abstract

A preparation process of an artificial long-strip core electrode belongs to the technical field of long-strip artificial core manufacturing processes, and comprises the following steps: S1, designing a pressing plate: designing the pressing plate by using Solidworks software, designing the thickness of the pressing plate to be 30mm, determining the length and width according to a core manufacturing mold, and designing the logarithm of the electrode according to experimental requirements; s2, a pressing plate is manufactured, an aluminum plate with the proper hardness is selected, and a numerical control machine tool is used for drilling machining according to the design; s3, an electrode is manufactured, the electrode with the length of 100 mm is manufactured, and the diameter of the electrode is 1-1.5 mm; in order to solve the problems that the electrodes are easy to deform, the distances are not equal and the like caused by an existing conventional core electrode arrangement method, the artificial long-strip core electrode manufacturing process is adopted, the requirements of a water drive front indoor test are met, and the accuracy of a water drive front simulation test is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of long artificial rock core manufacturing technology, and in particular relates to a process for preparing an artificial long rock core electrode. Background Art

[0002] As a new technology for the development of low-permeability oil fields, water flooding front technology currently mainly uses tracer method and microseismic test method for on-site monitoring. However, it cannot monitor the heterogeneous low-permeability oil reservoirs in the mine in real time, and has the disadvantages of low accuracy, complex construction, long cycle, and high cost. The resistivity method can accurately monitor the position of the water flooding front, avoiding the above problems.

[0003] The core technology of the resistivity method for monitoring the front position of water drive is to prepare artificial core electrodes. The quality of the core electrodes directly determines the accuracy of calculating the front position of water drive. The existing conventional core electrode arrangement method usually directly inserts the electrode and compacts it at one time, so there are some problems: ① The electrode is easily bent and deformed, and it cannot be ensured that the electrode is in a vertical state; ② The electrode pair cannot be strictly guaranteed to be equidistant, and the inaccurate size and position seriously affect the accuracy of the water drive front calculation. Therefore, this field needs a method for preparing long core electrodes, which can accurately determine the electrode position according to the pressure plate to overcome the defects of the existing technology and meet the relevant experimental requirements. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes: a process for preparing an artificial long rock core electrode, comprising the following steps:

[0005] S1. Press plate design: Solidworks software is used to design the press plate. The designed thickness of the press plate is 30 mm. The length and width are determined according to the core making mold. The number of electrode pairs is designed according to the experimental needs.

[0006] S2. Make a pressing plate, select an aluminum plate with appropriate hardness, and use a CNC machine tool to perform drilling according to the design;

[0007] S3, making electrodes, making electrodes with a length of 100 mm and a diameter of 1-1.5 mm;

[0008] S4. Making long electrode cores:

[0009] The first step is to place the mold, mix quartz sand of different mesh sizes and epoxy resin glue in a certain proportion, rub them until they are evenly mixed, and evenly put the mixture into the mold;

[0010] Step 2: Cover the core with a pressure plate and press it to 55 mm, and keep the pressure for 10 minutes;

[0011] The third step is to use an awl to drill holes according to the positions of the electrode holes designed on the pressure plate, and insert the electrodes into the core through the electrode holes;

[0012] The fourth step is to place auxiliary bars between each electrode pair to prevent the electrodes from being bent during the pressing process;

[0013] Step 5: Continue to press the core from 55mm to 45mm, remove the pressing plate, and place the core in a constant temperature box at 80℃ for 24h. The electrodes will be arranged in the core according to the specified position and depth;

[0014] The sixth step is to cut the whole core into 6 long electrode cores with a size of 45mm*45mm*300mm. The long electrode core is then completed.

[0015] Furthermore, in step S1, on a 308*308*30mm pressing plate, 6 long strips of electrode cores are designed, each strip has 8 pairs of electrode holes evenly distributed, and the positions of the electrode holes are drawn according to the distribution of the electrodes, and the diameter of the electrode holes is 2mm.

[0016] Furthermore, the pressing plate produced in step S2 is an aluminum alloy plate, and its length*width*height is 308mm*308mm*30mm.

[0017] Furthermore, a square with a size of 300 mm*300 mm was drawn on the pressing plate, and the distance from the edges of the aluminum alloy plate on all sides was 4 mm. The electrodes were distributed 22.5 mm from the four sides of the square, and the electrode pairs were evenly distributed with equal spacing.

[0018] Furthermore, in step S3, the electrode material is copper wire, and the length of the electrodes is 100 mm.

[0019] Furthermore, in step S4, the electrode height is 100 mm, the pressing plate thickness is 30 mm, the target electrode core thickness is 45 mm, the auxiliary strip thickness is 30 mm, and the electrode is inserted into the core through the electrode hole.

[0020] Furthermore, in step 4, the mold is placed, quartz sand and epoxy resin of different mesh sizes are mixed and then scooped until they are evenly mixed and put into the mold, the pressing plate is covered and pressed to 55 mm, the pressure is maintained for 10 minutes, holes are punched with an awl according to the positions of the electrode holes designed on the pressing plate, the electrodes are inserted into the core through the electrode holes, the auxiliary strips are placed, and the auxiliary pressing plate is used to continue to press the core from 55 mm to 45 mm, and the pressing plate is removed.

[0021] Furthermore, in step S4, the thickness of the auxiliary strip is 30 mm.

[0022] The beneficial effects of the present invention are as follows: the present invention aims to solve the problems of easy deformation of electrodes and unequal spacing caused by the existing conventional core electrode arrangement method, and adopts an artificial long core electrode manufacturing process to meet the indoor test requirements of the water drive front and ensure the accuracy of the water drive front simulation test.

[0023] The present invention adopts a new process, a pressing plate with an electrode hole is used to insert the electrode into the core, and an auxiliary strip is placed, which ensures the accurate spatial position of the electrode and the vertical degree of the electrode in the core, and accurately calculates the water drive front.

[0024] The advantages of the present invention are that the pressing plate used is easy to make and is not easily deformed after long-term use; the material source is wide and easy to obtain, and the cost is low; the manufacturing process is simple and highly repeatable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the design drawing of 4.5*4.5*30cm artificial core electrode pressure plate;

[0026] Figure 2 The specific size design drawing of the artificial core electrode pressure plate is 4.5*4.5*30cm;

[0027] Figure 3 This is a schematic diagram of electrode core pressing;

[0028] Figure 4 Schematic diagram of the long electrode core.

[0029] Among them, 1. electrode, 2. core, 3. pressure plate, 4. auxiliary strip, 5. auxiliary pressure plate, 6. long core strip, 7. electrode pair. DETAILED DESCRIPTION

[0030] A process for preparing artificial long core electrodes, using an aluminum alloy flat plate of a certain thickness and fixed size as a pressing plate, and processing electrode jacks on the pressing plate according to a pre-designed electrode layout structure diagram. The number of electrode hole pairs on the pressing plate is designed according to research needs, and the electrodes are inserted into the core. The core of this invention is that the electrodes can be inserted into the core at the same time during the core pressing process, keeping the electrodes in a vertical state and the electrode pairs equidistantly distributed, which provides a favorable guarantee for the processing of displacement front position data, and is of great significance for accurately describing the dominant direction of water drive and residual oil distribution characteristics of water injection wells.

[0031] The technical solution adopted by the present invention is as follows:

[0032] Step (1), platen design. Use Solidworks software to design the platen, the platen design thickness is 30mm, length and width dimensions are determined according to the core making mold. Design the number of electrode pairs according to experimental needs. For example, on a 308*308*30mm platen, 6 long strips of electrode cores are designed, each with 8 pairs of electrode holes evenly distributed. Draw the position of the electrode holes according to the distribution of the electrodes, and the electrode hole diameter is 2mm;

[0033] Step (2), making a pressing plate. Select an aluminum plate with appropriate hardness and use a CNC machine tool to perform drilling according to the design;

[0034] Step (3), making electrodes. Making electrodes with a length of 100 mm and a diameter of 1-1.5 mm;

[0035] Step (4), making long electrode cores. The first step is to place the mold, mix quartz sand of different mesh sizes and epoxy resin glue in a certain proportion, rub until uniform, and evenly place the mixture into the mold. The second step is to cover the pressing plate and press the core to 55mm, and keep the pressure for 10 minutes. The third step is to use an awl to punch holes according to the positions of the electrode holes designed on the pressing plate, and insert the electrodes into the core through the electrode holes. The fourth step is to place auxiliary strips between each pair of electrodes to prevent the electrodes from being bent during the pressing process. The fifth step is to continue to press the core from 55mm to 45mm, remove the pressing plate, and place the core in an 80℃ constant temperature box for 24 hours. The electrodes will be arranged in the core according to the specified positions and depths. The sixth step is to cut the entire core into 6 long electrode cores with a size of 45mm*45mm*300mm, and the long electrode core is completed.

[0036] As a supplement and improvement to the above technical solution, the present invention also includes the following preferred features:

[0037] In the above scheme, preferably, in step (1), the pressure plate is designed with a total of 6 long strips of electrode cores, each strip has 8 pairs of electrode holes evenly distributed, and the diameter of each electrode hole is 2 mm.

[0038] In the above scheme, it is preferred that the pressing plate made in step (2) is mainly made of aluminum alloy plate, and its length*width*height is 308mm*308mm*30mm. A square is drawn on the pressing plate, and its size is 300mm*300mm, and the distance from the edge of the aluminum alloy plate is 4mm. The electrodes are distributed 22.5mm away from the four sides of the square, and the electrode pairs are evenly distributed with equal spacing.

[0039] In the above scheme, preferably, in step (3), the electrode material is copper wire. The length of the electrodes is 100 mm. The position and spacing dimensions are strict, and the rows and columns are equidistantly distributed to ensure the accuracy and effectiveness of the experiment.

[0040] In the above scheme, preferably, in step (4), the electrode height is 100 mm, the pressure plate thickness is 30 mm, the target electrode core thickness is 45 mm, the auxiliary strip thickness is 30 mm, and the electrode is inserted into the core through the electrode hole, thereby ensuring the straightness of the electrode and the accuracy of the electrode spatial coordinates.

[0041] In the above scheme, preferably, in step (4), the mold is placed, and quartz sand and epoxy resin (ethylenediamine) of different mesh sizes are mixed and then scooped until they are evenly mixed and put into the mold. Cover the pressing plate and press it to 55mm, and keep the pressure for 10 minutes. Use an awl to punch holes according to the positions of the electrode holes designed on the pressing plate, insert the electrodes into the core through the electrode holes, place the auxiliary strips, and use the auxiliary pressing plate to continue to press the core from 55mm to 45mm, and remove the pressing plate.

[0042] In the above solution, preferably, in step (4), the thickness of the auxiliary strip is 30 mm, which can effectively prevent the electrode from being bent during the core pressing process.

[0043] This embodiment is a preparation process for a 45mm*45mm*300mm long electrode core.

[0044] (1) The press plate was designed using Solidworks software. The distribution positions of 6 long electrode cores were designed on the press plate, and each strip had 8 pairs of electrode holes evenly distributed. Figure 1 shown.

[0045] (2) Select a suitable aluminum plate and process it into an aluminum alloy plate of 308mm*308mm*30mm; according to the design of the pressure plate, draw a square on the aluminum plate with a size of 300mm*300mm and a distance of 4mm from the edges of the aluminum alloy plate. Draw the position of the electrode and drill the hole. The specific size is as follows: Figure 2 shown.

[0046] (3) Make an electrode with a length of 100 mm.

[0047] (4) Make a 45mm*45mm*300mm long electrode core, put the mold in place, mix quartz sand of different mesh sizes and epoxy resin glue in a certain proportion, add them to the mold, cover it with a pressing plate and press it to 55mm.

[0048] (6) Insert the electrode into the core through the pressure plate, place several 30*30*300mm aluminum alloy auxiliary strips on the pressure plate, use the auxiliary pressure plate to press the core from 55mm to 45mm, and remove the pressure plate. Figure 3 shown.

[0049] (7) The thickness of the cutting saw blade of 4 mm has been fully considered when designing the pressing plate. The whole electrode core is cut into 6 long electrode cores with a size of 45 mm*45 mm*300 mm. The long core is then manufactured. Figure 4 shown.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for preparing an artificial long rock core electrode, characterized in that: The steps include: S1. Press plate design: Solidworks software is used to design the press plate. The designed thickness of the press plate is 30 mm. The length and width are determined according to the core making mold. The number of electrode pairs is designed according to the experimental needs. S2. Make a pressing plate, select an aluminum plate with appropriate hardness, and use a CNC machine tool to perform drilling according to the design; S3, making electrodes, making electrodes with a length of 100 mm and a diameter of 1-1.5 mm; S4. Making long electrode cores: The first step is to place the mold, mix quartz sand of different mesh sizes and epoxy resin glue in a certain proportion, rub them until they are evenly mixed, and evenly put the mixture into the mold; Step 2: Cover the core with a pressure plate and press it to 55 mm, and keep the pressure for 10 minutes; The third step is to use an awl to drill holes according to the positions of the electrode holes designed on the pressure plate, and insert the electrodes into the core through the electrode holes; The fourth step is to place auxiliary bars between each electrode pair to prevent the electrodes from being bent during the pressing process; Step 5: Continue to press the core from 55mm to 45mm, remove the pressing plate, and place the core in a constant temperature box at 80℃ for 24h. The electrodes will be arranged in the core according to the specified position and depth; The sixth step is to cut the whole core into 6 long electrode cores with a size of 45mm*45mm*300mm. The long electrode core is then completed.

2. The process for preparing an artificial long rock core electrode according to claim 1, characterized in that: In the step S1, on a 308*308*30mm pressing plate, 6 long strips of electrode cores are designed, each strip has 8 pairs of electrode holes evenly distributed, and the positions of the electrode holes are drawn according to the distribution of the electrodes, and the diameter of the electrode holes is 2mm.

3. The process for preparing an artificial long rock core electrode according to claim 1, characterized in that: The pressing plate made in step S2 is made of an aluminum alloy plate, and its length*width*height is 308mm*308mm*30mm.

4. The process for preparing an artificial long rock core electrode according to claim 3, characterized in that: Draw a square on the pressing plate with a size of 300mm*300mm. The distance from the edges of the aluminum alloy plate on all sides is 4mm. The electrodes are distributed 22.5mm away from the four sides of the square, and the electrode pairs are evenly distributed with equal spacing.

5. The process for preparing an artificial long rock core electrode according to claim 1, characterized in that: In step S3, the electrode material is copper wire, and the length of the electrodes is 100 mm.

6. The process for preparing an artificial long rock core electrode according to claim 1, characterized in that: In step S4, the electrode height is 100 mm, the pressing plate thickness is 30 mm, the target electrode core thickness is 45 mm, the auxiliary strip thickness is 30 mm, and the electrode is inserted into the core through the electrode hole.

7. The process for preparing an artificial long rock core electrode according to claim 1, characterized in that: In step 4, the mold is placed, quartz sand and epoxy resin of different mesh sizes are mixed and then scooped until they are evenly mixed and put into the mold, the pressing plate is covered and pressed to 55 mm, the pressure is maintained for 10 minutes, a hole is punched with an awl according to the position of the electrode hole designed on the pressing plate, the electrode is inserted into the core through the electrode hole, the auxiliary strip is placed, and the core is continued to be pressed from 55 mm to 45 mm using the auxiliary pressing plate, and the pressing plate is removed.

8. The process for preparing an artificial long rock core electrode according to claim 1, characterized in that: In step S4, the thickness of the auxiliary strip is 30 mm.

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