Carbon fiber wall fixing structure and process method of proppant transport flat plate device

Abstract

The invention relates to the technical field of oil and gas production experiments, and discloses a carbon fiber wall fixing structure and a process method for a proppant transport flat plate device. The proppant transport flat plate device comprises a pair of flat plates, and the carbon fiber wall fixing structure comprises a first carbon fiber layer, which is arranged between the pair of flat plates, and the first carbon fiber layer and the pair of flat plates form a wall body; a second carbon fiber layer is coated on the edge of the wall body, and the second carbon fiber layer covers the first carbon fiber layer; a fixing mechanism is arranged between the second carbon fiber layer and the pair of flat plates. The invention can effectively enhance the performance of the wall of the flat plate device, reduce the wear of the wall, and extend the service life of the device, so as to provide a more stable and reliable simulation environment for the proppant transport experiment.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas production experiments, and in particular to a carbon fiber wall fixing structure and a process method of a proppant transport flat plate device. Background Art

[0002] In the process of oil and gas field development, studying the migration law of proppants in fractures is of great significance for optimizing fracturing technology and improving oil and gas recovery.

[0003] The existing proppant transport flat plate device has many shortcomings in its wall structure when simulating actual working conditions, such as insufficient strength, poor corrosion resistance, poor blocking and fixing effects on proppant, etc. Especially when facing large-scale multi-scale experimental needs, the traditional wall fixing method is difficult to meet the requirements of long-term stable operation of the device and accurate simulation of proppant migration behavior under complex formation conditions. Summary of the invention

[0004] The object of the present invention is to provide a carbon fiber wall fixing structure and process method for a proppant transporting plate device, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a carbon fiber wall fixing structure of a proppant transport plate device, the proppant transport plate device includes a pair of plates, and the carbon fiber wall fixing structure includes: a first carbon fiber layer, which is arranged between the pair of plates, and the first carbon fiber layer and the pair of plates form a wall body; a second carbon fiber layer, which is coated on the edge of the wall body, and the second carbon fiber layer covers the first carbon fiber layer; a fixing mechanism, which is arranged between the second carbon fiber layer and the pair of plates.

[0006] Optionally, the fixing mechanism includes a plurality of carbon fiber fixing bolts, and the carbon fiber fixing bolts pass through the second carbon fiber layer and are connected to the flat plate.

[0007] Optionally, an elastic gasket is provided between the nut of the carbon fiber fixing bolt and the second carbon fiber layer.

[0008] Optionally, a protective coating is provided on the surface of the second carbon fiber layer.

[0009] Optionally, the first carbon fiber layer is bonded to a pair of the flat plates.

[0010] The present invention also provides a proppant transporting plate device, comprising: a pair of the above-mentioned plates; a carbon fiber wall fixing structure of the above-mentioned proppant transporting plate device, wherein the first carbon fiber layer is arranged between the pair of the above-mentioned plates.

[0011] The present invention also provides a process method for fixing the carbon fiber wall structure of a proppant transport plate device, comprising: connecting the first carbon fiber layer between a pair of the plates to form the wall body; wrapping the second carbon fiber layer on the edge of the wall body so that the second carbon fiber layer covers the first carbon fiber layer; connecting the fixing mechanism between the second carbon fiber layer and a pair of the plates.

[0012] Optionally, a pair of opposite end surfaces of the plate are pre-processed.

[0013] Optionally, the first carbon fiber layer is woven in a cross arrangement.

[0014] Optionally, the first carbon fiber layer is woven in parallel.

[0015] The present invention discloses the following technical effects: a first carbon fiber layer is arranged between a pair of flat plates to enhance the wear resistance of the flat plates and their ability to block proppants, while being able to withstand a certain pressure without deformation or damage, and a second carbon fiber layer is coated outside the first carbon fiber layer, and the second carbon fiber layer is reinforced by a fixing mechanism to prevent the first carbon fiber layer from warping or peeling off during use, thereby ensuring that the entire wall structure is more solid and reliable, effectively enhancing the performance of the wall of the flat plate device, reducing the wear of the wall, and extending the service life of the device, providing a more stable and reliable simulation environment for proppant migration experiments, facilitating in-depth research on the migration laws of proppants under different working conditions, and providing strong technical support for oil and gas field development. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of assembling the second carbon fiber layer of the present invention.

[0019] Figure 3 It is a schematic diagram of the parallel arrangement and weaving method of the first carbon fiber layer of the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-arrangement weaving method of the first carbon fiber layer of the present invention.

[0021] In the figure: 1, flat plate; 2, first carbon fiber layer; 3, second carbon fiber layer; 4, carbon fiber fixing bolts. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figure 1-Figure 4 The present invention provides a carbon fiber wall fixing structure of a proppant transporting plate device. The proppant transporting plate device includes a pair of plates 1. The carbon fiber wall fixing structure includes: a first carbon fiber layer 2, which is arranged between the pair of plates 1, and the first carbon fiber layer 2 and the pair of plates 1 form a wall body; a second carbon fiber layer 3, which is coated on the edge of the wall body, and the second carbon fiber layer 3 covers the first carbon fiber layer 2.

[0025] The fixing mechanism is disposed between the second carbon fiber layer 3 and the pair of flat plates 1 .

[0026] A first carbon fiber layer 2 is arranged between a pair of flat plates 1 to enhance the wear resistance of the flat plates 1 and their ability to block proppants, while being able to withstand a certain pressure without deformation or damage. A second carbon fiber layer 3 is coated outside the first carbon fiber layer 2, and the second carbon fiber layer 3 is reinforced by a fixing mechanism to prevent the first carbon fiber layer 2 from warping or peeling off during use, thereby ensuring that the entire wall structure is more solid and reliable, effectively enhancing the performance of the wall of the flat plate device, reducing wall wear, and extending the service life of the device, providing a more stable and reliable simulation environment for proppant migration experiments, and facilitating in-depth research on the migration laws of proppants under different working conditions, and providing strong technical support for oil and gas field development.

[0027] The first carbon fiber layer 2 and the second carbon fiber layer 3 are both woven from multiple layers of high-strength carbon fibers, and the carbon fibers have excellent properties such as high modulus, high strength, low density, and corrosion resistance.

[0028] The second carbon fiber layer 3 is connected to the wall body by riveting or welding.

[0029] In one embodiment of the present invention, the fixing mechanism includes a plurality of carbon fiber fixing bolts 4 , and the carbon fiber fixing bolts 4 pass through the second carbon fiber layer 3 and are connected to the flat plate 1 .

[0030] The carbon fiber fixing bolts 4 can tightly fix the second carbon fiber layer 3 on the wall surface body, thereby tightly fixing the first carbon fiber layer 2 on the wall surface body, thereby improving stability.

[0031] In one embodiment of the present invention, an elastic gasket is arranged between the nut of the carbon fiber fixing bolt 4 and the second carbon fiber layer 3. The carbon fiber fixing bolt 4 is made of titanium alloy material and has good strength and corrosion resistance. The threaded part thereof is precisely machined to ensure a close fit with the wall body and the second carbon fiber layer 3, thereby ensuring the reliability of the fixing effect.

[0032] The elastic gasket is used to prevent the second carbon fiber layer 3 from being damaged when the carbon fiber fixing bolt 4 is tightened, thereby ensuring that the second carbon fiber layer 3 can be evenly stressed and stably fixed on the wall body.

[0033] In one embodiment of the present invention, a protective coating is provided on the surface of the second carbon fiber layer 3 .

[0034] The protective coating is made of nano-ceramic material, which can not only further improve the wear resistance and corrosion resistance of the wall, but also reduce the friction between the proppant and the carbon fiber layer, making the migration of the proppant near the wall smoother and closer to the actual migration situation in the formation.

[0035] The thickness of the protective coating is 0.1-0.3mm.

[0036] In one embodiment of the present invention, the first carbon fiber layer 2 is bonded to the pair of flat plates 1 using a high temperature resistant, high strength epoxy resin based adhesive.

[0037] The present invention also provides a proppant transporting plate device, comprising: a pair of plates 1; and a carbon fiber wall fixing structure of the proppant transporting plate device, wherein a first carbon fiber layer 2 is arranged between the pair of plates 1.

[0038] A pressure crack is formed at a distance between a pair of flat plates 1. The pressure crack is used to simulate proppant migration. The first carbon fiber layer 2 is sealed around the pressure crack.

[0039] The present invention also provides a process method for fixing the carbon fiber wall structure of a proppant transport plate device, including pre-treating the opposite end faces of a pair of plates 1, selecting suitable materials to make a pair of plates 1, and pre-treating the end faces thereof by sandblasting, phosphating, etc., so as to improve the surface roughness and activity and enhance the bonding strength with the binder.

[0040] The first carbon fiber layer 2 is connected between a pair of flat plates 1 to form a wall body, and the first carbon fiber layer 2 is tightly bonded to the inner surface of the sealing part of the pair of flat plates 1 using a high-temperature resistant and high-strength epoxy resin-based adhesive. During the bonding process, a certain pressure is applied by a pressure device to ensure that there are no bubbles or gaps between the first carbon fiber layer 2 and the flat plates 1, so that the adhesive can fully fill the tiny gap between the two to ensure the firmness of the bonding.

[0041] The second carbon fiber layer 3 is wrapped around the edge of the wall body so that the second carbon fiber layer 3 covers the first carbon fiber layer 2; the second carbon fiber layer 3 is fixed along the edge of the wall body and connected to the wall body by riveting or welding, so that it fits tightly to the edge of the first carbon fiber layer, thereby enhancing the fixing effect of the edge.

[0042] Connect the fixing mechanism between the second carbon fiber layer 3 and a pair of flat plates 1, drill holes on the wall body at a certain interval, pass the carbon fiber fixing bolts 4 through the second carbon fiber layer 3 and the wall body, and place elastic gaskets at the contact position between the nut part of the carbon fiber fixing bolts 4 and the second carbon fiber layer 3, and then use a torque wrench to tighten the carbon fiber fixing bolts 4 to the specified torque, so that the second carbon fiber layer 3 is firmly fixed on the wall body.

[0043] A polyurea waterproof coating is poured at the sealing part (i.e., the second carbon fiber layer 3), and a layer of nano-ceramic protective coating with a thickness of 0.1-0.3 mm is coated on the surface of the carbon fiber layer by plasma spraying. During the spraying process, the spraying process parameters are strictly controlled, such as spraying voltage, current, gas flow, distance and angle between the spray gun and the wall, etc., to ensure that the protective coating is evenly and densely covered on the carbon fiber layer, forming a smooth, wear-resistant and corrosion-resistant protective film.

[0044] In one embodiment of the present invention, the weaving mode of the first carbon fiber layer 2 is a cross arrangement.

[0045] In one embodiment of the present invention, the first carbon fiber layer 2 is woven in a parallel arrangement.

[0046] Specific embodiment one.

[0047] A large multi-scale proppant transport flat device is designed, whose wall simulates the tortuosity of real conglomerate fractures, with dimensions of 2000 mm in length, 1 mm in width, and 450 mm in height. An adhesive is applied to the inner surface of the wall body seal, and the first carbon fiber layer 2 is arranged in parallel with carbon fiber strips.

[0048] A second carbon fiber layer 3 is provided at 20 mm intervals on the four edges of the wall seal. The second carbon fiber layer 3 is a carbon fiber plate with a width of 20 mm and a thickness of 5 mm, and is connected to the wall body by riveting. A carbon fiber fixing bolt 4 is provided at 300 mm intervals on the second carbon fiber layer 3. The bolt specification is M10. After passing through the second carbon fiber layer 3 and the wall body, it is fastened by a nut on the outside of the wall body.

[0049] Polyurea cement is poured at the sealing point for waterproofing, and a layer of 0.2mm thick nano-ceramic protective coating is applied on the surface by spraying to ensure that the coating is uniform and dense.

[0050] Specific embodiment two.

[0051] A large multi-scale proppant transport flat device is designed, whose wall simulates the tortuosity of real conglomerate fractures, with dimensions of 2000 mm in length, 1 mm in width, and 450 mm in height. An adhesive is applied to the inner surface of the wall body seal, and the first carbon fiber layer 2 is arranged in a cross-weaving arrangement.

[0052] A second carbon fiber layer 3 is provided at 10 mm intervals on the four edges of the wall seal. The second carbon fiber layer 3 is a carbon fiber plate with a width of 20 mm and a thickness of 5 mm, and is connected to the wall body by riveting. A carbon fiber fixing bolt 4 is provided at 400 mm intervals on the surface of the second carbon fiber layer 3. The bolt specification is M10. After passing through the second carbon fiber layer 3 and the wall body, it is fastened by a nut on the outside of the wall body.

[0053] Polyurea cement is poured at the sealing point for waterproofing, and a layer of 0.3mm thick nano-ceramic protective coating is coated on the surface by spraying to ensure that the coating is uniform and dense.

[0054] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A carbon fiber wall fixing structure for a proppant transporting plate device, characterized in that: The proppant transporting plate device comprises a pair of plates (1), and the carbon fiber wall fixing structure comprises: A first carbon fiber layer (2) is arranged between the pair of flat plates (1), wherein the first carbon fiber layer (2) and the pair of flat plates (1) form a wall body; A second carbon fiber layer (3) is coated on the edge of the wall body, and the second carbon fiber layer (3) covers the first carbon fiber layer (2); A fixing mechanism, arranged between the second carbon fiber layer (3) and the pair of flat plates (1); The fixing mechanism comprises a plurality of carbon fiber fixing bolts (4), and the carbon fiber fixing bolts (4) pass through the second carbon fiber layer (3) and are connected to the flat plate (1).

2. The carbon fiber wall fixing structure of the proppant transporting plate device according to claim 1, characterized in that: An elastic gasket is provided between the nut of the carbon fiber fixing bolt (4) and the second carbon fiber layer (3).

3. The carbon fiber wall fixing structure of the proppant transporting plate device according to claim 1, characterized in that: A protective coating is provided on the surface of the second carbon fiber layer (3).

4. The carbon fiber wall fixing structure of the proppant transporting plate device according to claim 1, characterized in that: The first carbon fiber layer (2) is bonded to a pair of flat plates (1).

5. A proppant transporting plate device, characterized in that: A carbon fiber wall fixing structure comprising a proppant transporting flat plate device as described in any one of claims 1 to 4.

6. A process for producing a carbon fiber wall fixing structure of a proppant transport plate device, used for producing a carbon fiber wall fixing structure of a proppant transport plate device according to any one of claims 1 to 4, characterized in that: include: Connecting the first carbon fiber layer (2) between a pair of the flat plates (1) to form the wall body; Wrapping the second carbon fiber layer (3) around the edge of the wall body, so that the second carbon fiber layer (3) covers the first carbon fiber layer (2); The fixing mechanism is connected between the second carbon fiber layer (3) and a pair of flat plates (1).

7. The process method for fixing the carbon fiber wall surface structure of the proppant transporting plate device according to claim 6, characterized in that: The opposite end surfaces of a pair of the flat plates (1) are pre-processed.

8. The process for fixing the carbon fiber wall structure of the proppant transporting plate device according to claim 6, characterized in that: The first carbon fiber layer (2) is woven in a cross-arrangement manner.

9. The process method for fixing the carbon fiber wall surface structure of the proppant transporting plate device according to claim 6, characterized in that: The first carbon fiber layer (2) is woven in a parallel arrangement.

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