Anti-buoyancy lotus-shaped base of underwater liquid oxygen fracturing pipe and machining mold of anti-buoyancy lotus-shaped base

Abstract

The utility model belongs to the field of underwater rock mass fracturing engineering, and particularly relates to an anti-buoyancy lotus-shaped base of an underwater liquid oxygen fracturing pipe and a machining mold of the anti-buoyancy lotus-shaped base. The anti-buoyancy lotus-shaped base comprises a barrel, a conical cap and a plurality of elastic limiting petals, the overall structure is simple, when used, the anti-buoyancy lotus-shaped base is installed at the lower end of the fracturing pipe, the conical cap has the guiding function, and the limiting petals are arranged on the barrel. A step between a sleeve and a drill hole can be easily penetrated through, so that normal running of the sleeve is ensured; and the plurality of elastic limiting petals are elastically propped against the hole wall, so that the facing buoyancy during underwater installation of the fracturing pipe is effectively resisted, the installation of the fracturing pipe at a specified position is ensured, a foundation is built for the subsequent stable operation of the underwater liquid oxygen fracturing pipe, and the safety and reliability of the fracturing pipe in an underwater environment are powerfully ensured. The machining die is simple in structure and low in cost, and batch machining of the anti-buoyancy lotus-shaped base can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater rock mass fracturing engineering, and particularly relates to an anti-floating lotus-shaped base of an underwater liquid oxygen fracturing pipe and a processing die thereof. BACKGROUND

[0002] As a new rock mass fracturing technology, the liquid oxygen fracturing technology has shown significant advantages in land rock breaking operations. The operation process thereof is relatively simple and clear. Generally, the fracturing pipe is only needed to be placed in a drilled hole, then liquid oxygen is injected into the hole, and then a wire is connected and ignited, so that the effect of fracturing the rock mass can be achieved.

[0003] However, when the rock breaking operation is transferred to the underwater environment, a series of challenges and problems will be faced. One of them is that the fracturing pipe will be affected by the buoyancy of water during the underwater drilling process. This physical property makes it difficult for the fracturing pipe to achieve self-stability at a specified position underwater, which will cause the rock breaking effect to be unable to achieve the expected effect. The existing solution is that one worker uses a cannon to press the fracturing pipe into the specified position in the water, and then another worker fills the filling material into the hole until the weight of the filling material and the buoyancy of the fracturing pipe are balanced, so that the fracturing pipe is stopped at the specified position underwater, and finally the cannon is taken out. Such a process is feasible, but it is too complicated and will reduce the continuity of the construction. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides an anti-floating lotus-shaped base of an underwater liquid oxygen fracturing pipe and a processing die thereof, which are used to solve the technical problem that the fracturing pipe is difficult to achieve self-stability at a specified position underwater.

[0005] Therefore, according to one aspect of the present application, an anti-floating lotus-shaped base of an underwater liquid oxygen fracturing pipe is provided, which comprises a cylinder, a cone cap and a plurality of elastic limiting petals. The large end of the cone cap is connected with one end of the cylinder. The plurality of limiting petals are uniformly arranged at the end of the cylinder away from the cone cap in the circumferential direction, and the limiting petals are mutually unfolded. The cylinder is used for sleeving the lower end of the fracturing pipe. The cone cap is used for guiding during the process of inserting the fracturing pipe into the hole. The limiting petals are used for elastically abutting against the hole wall to overcome the buoyancy of the fracturing pipe in water.

[0006] Optionally, the outer diameter of the large end of the cone cap is the same as the outer diameter of the cylinder.

[0007] Optionally, the cylinder, the cone cap and the plurality of limiting petals are of an integral structure.

[0008] Optionally, the anti-floating lotus-shaped base is made of PVC, PET or PE material.

[0009] Optionally, an inner wall of the barrel is provided with an internal thread, and the barrel is connected with the lower end of the fracturing pipe through the thread connection.

[0010] The barrel is provided with a mounting hole, and the barrel is fixed to the lower end of the fracturing pipe through a screw passing through the mounting hole.

[0011] According to another aspect of the present application, a processing die of the anti-floating lotus-shaped base is provided for processing the anti-floating lotus-shaped base as described above, and the processing die comprises an upper die, a lower die and a petal angle forming assembly; the upper die comprises a cylindrical body and a conical pressure head coaxially arranged at one end of the cylindrical body, and the lower die is provided with a groove with a conical inner wall; the petal angle forming assembly comprises an upper conical sleeve and a lower conical sleeve, the upper conical sleeve is sleeved on the upper end of the cylindrical body, the outer diameter of the upper conical sleeve gradually increases from the end close to the conical pressure head to the end away from the conical pressure head, and the lower conical sleeve is arranged on the top of the lower die and above the groove, the inner wall of the lower conical sleeve comprises a conical surface and a cylindrical surface from top to bottom in sequence, and the conical surface cooperates with the upper conical sleeve to control the unfolding angle of the limiting petal.

[0012] Optionally, the end of the cylindrical body away from the conical pressure head is provided with a flange, and the end of the upper conical sleeve away from the conical pressure head is provided with an embedding groove for the flange.

[0013] Optionally, the top of the lower die is provided with a ring of limiting protrusions around the groove, and the lower end of the lower conical sleeve is provided with a limiting groove matched with the limiting protrusions.

[0014] Optionally, the petal angle forming assembly is provided with multiple groups, and the taper of the conical surface of the inner wall of the lower conical sleeve in each group of the petal angle forming assembly is different.

[0015] The anti-floating lotus-shaped base of the underwater liquid oxygen fracturing pipe and the processing die thereof provided by the present application have the following beneficial effects: compared with the prior art, the anti-floating lotus-shaped base of the present application comprises a barrel, a conical cap and multiple elastic limiting petals, the overall structure is simple, when in use, the anti-floating lotus-shaped base is installed to the lower end of the fracturing pipe, the conical cap has a guiding effect and can easily pass through the step between the sleeve and the drill hole, ensuring the normal lowering of the pipe; the multiple elastic limiting petals are in elastic abutment with the hole wall, effectively resisting the buoyancy when the fracturing pipe is installed underwater, ensuring the installation of the fracturing pipe at the specified position, laying a solid foundation for the subsequent stable operation of the underwater liquid oxygen fracturing pipe, and effectively guaranteeing the safety and reliability of the underwater liquid oxygen fracturing pipe in the underwater environment. The processing die has a simple structure and low cost, and can realize batch processing of the anti-floating lotus-shaped base. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Wherein:

[0018] Figure 1 is the front view of the anti-floating lotus-shaped base of the underwater liquid oxygen fracturing pipe according to an embodiment of the present application;

[0019] Figure 2 is Figure 1 the top view of the anti-floating lotus-shaped base shown in the figure;

[0020] Figure 3 is a structural schematic diagram of a processing mold according to an embodiment of the present application;

[0021] Figure 4 is a sectional structural schematic diagram of a processing mold according to an embodiment of the present application.

[0022] Explanation of reference signs:

[0023] 10, anti-floating lotus-shaped base; 11, cylinder body; 12, cone cap; 13, limiting petal;

[0024] 20, original lower end cover;

[0025] 100, upper mold; 110, columnar body; 111, flange; 120, conical pressure head; 130, handle;

[0026] 200, lower mold; 210, limiting protrusion;

[0027] 300, petal angle forming assembly; 310, upper cone sleeve; 311, embedding groove; 320, lower cone sleeve; 3201, limiting groove. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many other different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0033] According to one aspect of this application, embodiments of this application provide an anti-buoyancy lotus-shaped base for an underwater liquid oxygen fracturing tube, such as... Figures 1-2 As shown, the anti-buoyancy lotus-shaped base 10 includes a cylindrical body 11, a conical cap 12, and multiple elastic limiting petals 13. The large end of the conical cap 12 is connected to one end of the cylindrical body 11. The multiple limiting petals 13 are evenly arranged circumferentially at the end of the cylindrical body 11 away from the conical cap 12, and the limiting petals 13 are spread out between each other. The cylindrical body 11 is used to fit over the lower end of the fracturing tube. The conical cap 12 is used to guide the fracturing tube during insertion into the hole. The limiting petals 13 are used to elastically abut against the hole wall to overcome the buoyancy of the fracturing tube in the water.

[0034] Understandably, the outer diameter of the large end of the cone cap 12 and the outer diameter of the cylinder 11 are both smaller than the diameter of the borehole in the field, and the size of the multiple limiting flaps 13 after they are unfolded together is larger than the diameter of the borehole in the field.

[0035] In the embodiment of the present application, the anti-floating lotus-shaped base 10 is composed of a cylinder 11, a cone cap 12 and a plurality of elastic limiting petals 13. The overall structure is simple. When in use, the anti-floating lotus-shaped base 10 is installed at the lower end of the fracturing pipe. The cone cap 12 has a guiding effect and can easily pass through the step between the casing and the drill hole, facilitating the sinking of the pipe and ensuring the normal lowering of the pipe. The plurality of elastic limiting petals 13 elastically abut against the hole wall, effectively resisting the buoyancy when the fracturing pipe is installed underwater, so that the pipe body can be self-stabilized and suspended at the optimal position of the blast hole, facilitating the optimization of the blasting parameters.

[0036] In one embodiment, as shown in Figure 1 the outer diameter of the large end of the cone cap 12 is the same as the outer diameter of the cylinder 11, which facilitates the machining and manufacturing.

[0037] In one embodiment, as shown in Figure 1 the cylinder 11, the cone cap 12 and the plurality of limiting petals 13 are of an integrated structure, so that the connection between the components of the structure is more compact, the joints and complex nodes are reduced, and the overall strength and stability of the anti-floating lotus-shaped base 10 are improved.

[0038] Specifically, the anti-floating lotus-shaped base 10 can be processed by splitting the end cap made of PVC, PET or PE material, then heat processed and formed by the processing mold in the following embodiments.

[0039] In one embodiment, the inner wall of the cylinder 11 is provided with an internal thread (not shown in the figure), and the cylinder 11 is connected with the lower end of the fracturing pipe through the thread.

[0040] The cylinder 11 is fixed at the lower end of the fracturing pipe by the screw passing through the mounting hole.

[0041] By using the above connection mode, the reliable connection between the cylinder 11 of the anti-floating lotus-shaped base 10 and the lower end of the fracturing pipe can be achieved. Of course, it is conceivable that the cylinder 11 of the anti-floating lotus-shaped base 10 and the lower end of the fracturing pipe can also be connected by heat melting or glue.

[0042] According to another aspect of the present application, the embodiment of the present application also provides a processing mold of an anti-floating lotus-shaped base for processing the anti-floating lotus-shaped base in the above embodiments, as shown in Figures 3-4As shown, the processing mold includes an upper die 100, a lower die 200 and a petal angle forming assembly 300; the upper die 100 includes a cylindrical body 110 and a conical pressure head 120 coaxially arranged at one end of the cylindrical body 110, and the lower die 200 is provided with a groove with a conical inner wall; the petal angle forming assembly 300 includes an upper conical sleeve 310 and a lower conical sleeve 320, the upper conical sleeve 310 is sleeved on the upper end of the cylindrical body 110, the outer diameter of the upper conical sleeve 310 gradually increases from the end close to the conical pressure head 120 to the end away from the conical pressure head 120, and the lower conical sleeve 320 is arranged at the top of the lower die 200 and above the groove, the inner wall of the lower conical sleeve 320 includes a conical surface and a cylindrical surface from top to bottom in turn, and the conical surface cooperates with the upper conical sleeve 310 to control the unfolding angle of the limiting petal 13.

[0043] Wherein, the upper die 100 and the lower die 200 can be made of cast iron material, and the two cooperate with each other to complete the pressing forming work of the conical cap 12 and the cylinder 11 of the anti-floating lotus-shaped base. The petal angle forming assembly 300 can also be made of cast iron material, and the upper conical sleeve 310 and the lower conical sleeve 320 in the petal angle forming assembly 300 limit the opening angle (unfolding degree) between each limiting petal 13 during the pressing process of the upper die 100 and the lower die 200.

[0044] The processing mold can be made according to the actual working conditions of the on-site drilling to produce suitable anti-floating lotus-shaped bases, and the processing method is simple to operate, the material is easy to obtain, and has the advantages of low cost, high efficiency, etc.

[0045] Further, the end of the cylindrical body 110 away from the conical pressure head 120 of the upper die 100 is provided with a handle 130, which facilitates the removal of the upper die 100 after processing is completed.

[0046] In one embodiment, as shown in Figure 4 The end of the cylindrical body 110 away from the conical pressure head 120 is provided with a flange 111, and the end of the upper conical sleeve 310 away from the conical pressure head 120 is provided with an embedding groove 311 for the flange 111. Through the cooperation of the flange 111 and the embedding groove 311, the relative movement of the upper conical sleeve 310 relative to the cylindrical body 110 can be prevented during the pressing of the anti-floating lotus-shaped base, and the stability during pressing is improved.

[0047] The top of the lower die 200 is provided with a ring of limiting protrusions 210 around the groove, and the lower end of the lower conical sleeve 320 is provided with a limiting groove 3201 matched with the limiting protrusions 210. Through the cooperation of the limiting protrusions 210 and the limiting groove 3201, the positioning effect between the lower conical sleeve 320 and the lower die 200 is achieved, and the stability during pressing is also improved.

[0048] In an embodiment, the petal angle forming assembly 300 is provided with multiple groups, and the taper of the tapered surface of the inner wall of the lower cone sleeve 320 in each group of petal angle forming assembly 300 is different. By setting this way, the opening angle of the limiting petals 13 in the anti-floating lotus-shaped base 10 can be adjusted by replacing the petal angle forming assembly 300, so as to increase or decrease the friction between the limiting petals 13 and the hole wall.

[0049] In combination Figures 1-4 As shown, the application also provides a processing method of an anti-floating lotus-shaped base, comprising the following steps:

[0050] S1. According to the actual drilling diameter of the construction site, the diameter of the cylinder 11 of the anti-floating lotus-shaped base 10 is determined, and a certain number of original lower end covers 20 are purchased. The original lower end cover 20 is a plastic pipe section with one end closed and the other end open.

[0051] S2. Since the limiting petals 13 of the anti-floating lotus-shaped base 10 are fixed at one end and free at the other end, and the deformation after being subjected to pressure is very small, it can be simplified as a cantilever beam model. According to the formula of material mechanics, it can be known that:

[0052]

[0053] In the formula: f is the sliding friction force of the limiting petals 13 in the hole; E is the elastic modulus of the limiting petals 13; μ is the friction coefficient between the limiting petals 13 and the hole wall; y is the difference between the radius of each limiting petal 13 after unfolding and the radius of the hole; R is half of the outer diameter of the cylinder 11; r is half of the inner diameter of the cylinder 11; L is the length of the limiting petals 13; n is the number of the limiting petals 13.

[0054] Since the site working condition is relatively complex, it is difficult to obtain the two parameters E and μ, but f can be measured by a force gauge on site, R and r are inherent parameters of the cylinder 11 of the anti-floating lotus-shaped base 10, and y, L and n can be determined in advance, so Eμ can be regarded as a whole and recorded as K. As long as the above easily obtained parameters (R, r, f, y, L and n) are brought into the formula, the value of K can be obtained. Therefore, 3-4 anti-floating lotus-shaped bases 10 are processed in the processing factory, and the attribute parameters of these anti-floating lotus-shaped bases 10 are set in advance, then these anti-floating lotus-shaped bases 10 are taken to the site, the sliding friction force f they suffer in the hole is measured by a force gauge, and the average value is taken to obtain the value of K according to the above formula.

[0055] Because it is too difficult to adjust the three parameters y, L and n simultaneously, the parameters L and n, which are difficult to adjust flexibly, can be determined first, so that the unknown parameter y on the right side of the above equation is the only one. As long as the friction force f provided by the anti-floating lotus-shaped base 10 is determined according to the site conditions, the value of the parameter y can be obtained according to the above equation, so as to provide the corresponding angle parameters for the processing of the mold pressing limiting petal piece.

[0056] It should be noted here that because the drilling radius is known, the value of the outermost radius of the anti-floating lotus-shaped base 10 (the radius of the circle after the unfolding of each limiting petal piece 13) can be obtained after y is solved, and then the outermost radius minus half the outer diameter of the cylinder 11 is the length corresponding to the limiting petal piece 13 in the radial direction of the cylinder 11, and then the actual length of the limiting petal piece 13 is determined in advance, so according to the Pythagorean theorem, the length corresponding to the limiting petal piece 13 in the axial direction of the cylinder 11 can be obtained, which is equivalent to knowing the three sides of a right triangle, and then according to the sine and cosine, the angle of the limiting petal piece 13 relative to the axis of the cylinder 11 can be obtained, and then the processing factory can prepare the petal angle forming assembly 300 in the processing mold according to the degree.

[0057] S3. After determining the specific parameters of the upper mold 100, the lower mold 200 and the petal angle forming assembly 300, the schematic diagram of the upper mold 100, the lower mold 200 and the petal angle forming assembly 300 is drawn and the specific values of the parameters are marked. Around the deflection angle of the limiting petal piece 13, 2-3 sets of petal angle forming assemblies 300 are made, and the taper of the conical surface of the inner wall of each set of petal angle forming assembly 300 is different, so as to flexibly adjust the deflection angle of the limiting petal piece 13.

[0058] S4. The schematic diagram is handed over to the processing factory, and the mold and a plurality of petal angle forming assemblies 300 are processed, and the original lower end cover 20 is split, that is, a plurality of incisions are uniformly cut on the open end of the original lower end cover 20.

[0059] S5. The split processed lower end cover is placed in a drying oven at about 150°C for 2-3 minutes, during which the petal angle forming assembly 300 corresponding to the upper mold 100 and the lower mold 200 with the appropriate angle is selected and assembled, then the lower end cover is taken out from the drying oven and quickly placed in the groove of the lower mold 200, then the upper mold 100 is combined with the upper cone sleeve 310 and immediately pressed onto the lower end cover, and kept for 2-3 minutes. After the lower end cover is set, it is taken out and the processing is completed.

[0060] S6. When the site test finds that the friction force provided by the anti-floating lotus-shaped base 10 is not suitable, the opening angle of the limiting petal piece 13 can be modified by replacing the petal angle forming assembly 300, so as to increase or decrease the friction force.

[0061] In the present embodiment, the processing method of the anti-float lotus-shaped base is suitable for the production of the underwater liquid oxygen induced cracking pipe matching base of conventional specifications in engineering practice, and can also make processing molds according to underwater liquid oxygen induced cracking pipes of various sizes and models to meet diversified operation needs. The method can accurately realize the optimization of the key size of the anti-float lotus-shaped base 10, lay a solid foundation for subsequent stable operation of the underwater liquid oxygen induced cracking pipe, and effectively guarantee the safety and reliability of the underwater liquid oxygen induced cracking pipe in the underwater environment. At the same time, the batch processing method has high efficiency and convenient practicality, and does not need to introduce complicated and expensive processing equipment. In many actual engineering scenes such as underwater blasting engineering and ocean resource development, which frequently use underwater liquid oxygen induced cracking pipes, it has a very wide application prospect.

[0062] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0063] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A buoyancy counteracting lotus base for an underwater liquid oxygen fracturing pipe, characterized in that, The application relates to an anti-floating lotus-shaped base, which comprises a cylinder, a cone cap and a plurality of elastic limiting petals, the large end of the cone cap is connected with one end of the cylinder, a plurality of the limiting petals are uniformly arranged on the end of the cylinder away from the cone cap in a circumferential direction, and each of the limiting petals is mutually unfolded, the cylinder is used for sleeving the lower end of a fracturing pipe, the cone cap is used for guiding during the process of inserting the fracturing pipe into a hole, and the limiting petals are used for elastically abutting against the hole wall to overcome the buoyancy of the fracturing pipe in water.

2. The anti-flooding lotus base according to claim 1, characterized in that, The outer diameter of the large end of the cone cap is the same as the outer diameter of the cylinder.

3. The anti-flooding lotus base according to claim 1, characterized in that, The cylinder, the cone cap and the plurality of limiting petals are in an integrated structure.

4. The anti-flooding lotus base according to claim 1, wherein, The anti-floating lotus-shaped base is made of PVC, PET or PE.

5. The anti-flooding lotus base according to claim 1, wherein, The inner wall of the cylinder is provided with internal threads, and the cylinder and the lower end of the fracturing pipe are connected through threads; or The cylinder is provided with a mounting hole, and the cylinder is fixed on the lower end of the fracturing pipe through a screw penetrating the mounting hole.

6. A processing die for processing a floating force resistant lotus base according to any one of claims 1-5, characterized in that, The processing die comprises an upper die, a lower die and a petal angle forming assembly; the upper die comprises a columnar body and a conical pressure head coaxially arranged at one end of the columnar body, and the lower die is provided with a groove with a conical inner wall surface; the petal angle forming assembly comprises an upper cone sleeve and a lower cone sleeve, the upper cone sleeve is sleeved on the upper end of the columnar body, the outer diameter of the upper cone sleeve gradually increases from the end close to the conical pressure head to the end away from the conical pressure head, the lower cone sleeve is arranged on the top of the lower die and above the groove, and the inner wall of the lower cone sleeve comprises a conical surface and a cylindrical surface from top to bottom; and the conical surface cooperates with the upper cone sleeve to control the unfolding angle of the limiting petal.

7. The processing mold of claim 6 wherein, The end of the columnar body away from the conical pressure head is provided with a flange, and the end of the upper cone sleeve away from the conical pressure head is provided with an embedding groove for embedding the flange.

8. The processing mold of claim 6 wherein, The top of the lower die is provided with a limiting protrusion around the groove, and the lower end of the lower cone sleeve is provided with a limiting groove matched with the limiting protrusion.

9. A processing die according to any one of claims 6-8, characterised in that The petal angle forming assembly is provided with a plurality of groups, and the taper of the conical surface of the inner wall of the lower cone sleeve in each group is different.

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