Experimental device for coal seam fracturing combined biological yield increase

Abstract

The utility model belongs to the technical field of coal seam fracturing, and particularly relates to an experimental device for coal seam fracturing combined biological yield increase, which comprises a drill rod, and further comprises a rotating shaft, a coil spring, a built-in shaft, a spray hole, a connecting plate, a protective plate and a fracturing groove which are arranged on one side of the drill rod, and the surface of the rotating shaft is further fixedly connected with one end of the coil spring, the other end of the coil spring is fixedly connected to the inner surface of the drill rod, and the rotating shaft is further fixedly installed on the surface of the built-in shaft. In the process, the spraying holes can be contained in the inner surface of the drill rod, the spraying holes can be prevented from being affected by soil and impurities, follow-up coal seam fracturing work can be effectively carried out, the maintenance time cost can be reduced, and the coal seam fracturing efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal seam fracturing, and in particular relates to an experimental device for coal seam fracturing combined with biological production increase. Background Art

[0002] Coal seam fracturing can effectively connect the wellbore with the natural fractures of the coal seam, thereby more widely distributing the pressure drop near the wellbore during water drainage and gas production, increasing production capacity and gas desorption rate;

[0003] After checking the publication number: CN212958552U, a coal seam deep hole fracturing sealer with multiple connections is disclosed. This technology discloses "a first expansion rubber tube, a second expansion rubber tube and a third expansion rubber tube, the top of the first expansion rubber tube is provided with a water injection port, the bottom of the first expansion rubber tube is detachably connected to the second expansion rubber tube, the bottom of the second expansion rubber tube is detachably connected to the third expansion rubber tube, a fracturing hole is provided between the first expansion rubber tube and the second expansion rubber tube, a connecting port is provided on the bottom surface of the first expansion rubber tube, and a connecting head is provided on the top surface of the second expansion rubber tube, and the connecting head is clamped with the connecting port. The utility model provides a connecting head and a connecting port at both ends of the expansion rubber tube, and the expansion rubber tubes are detachably installed with each other through the connecting head and the connecting port, and the sealer can be installed or removed according to the depth of the coal hole, and the optimal number of expansion rubber tubes installed has been achieved, thereby improving the use limitations of the sealer".

[0004] Although the design allows installation or removal of the sealer according to the depth of the coal hole, achieving the optimal number of expansion rubber tubes to be installed, thereby increasing the limitations of the sealer, as the device goes deeper underground, the holes on its surface may become blocked due to the influence of gravel and underground impurities, thereby affecting subsequent fracturing work, increasing maintenance costs, and affecting the normal efficiency of coal seam fracturing.

[0005] In order to solve the above problems, this application proposes an experimental device for coal seam fracturing combined with biological production enhancement. Utility Model Content

[0006] To solve the problems raised in the above background technology. The utility model provides an experimental device for coal seam fracturing combined with biological production increase, which can seal the fracturing groove during drilling through the rotation of the drill rod, and in this process, the spray hole can also be stored in the inner surface of the drill rod, which can avoid being affected by soil and impurities, so that the subsequent coal seam fracturing work can be carried out effectively, which can reduce the time cost of maintenance and improve the efficiency of coal seam fracturing.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an experimental device for coal seam fracturing combined with biological production enhancement, comprising a drill pipe, and also comprising a rotating shaft, a coil spring, a built-in shaft, a spray hole, a connecting plate, a protective plate and a fracturing groove arranged on one side of the drill pipe, the inner surface of the drill pipe is rotationally connected to one side of the rotating shaft, and the surface of the rotating shaft is also fixedly connected to one end of the coil spring, and the other end of the coil spring is fixedly connected to the inner surface of the drill pipe, the rotating shaft is also fixedly installed on the surface of the built-in shaft, and the built-in shaft and the inner surface of the drill pipe are rotationally connected, and the surface of the built-in shaft is also provided with the spray hole, and the connecting plate is also fixedly installed on one side of the built-in shaft, and at the same time, the connecting plate is slidably connected to the fracturing groove opened on the surface of the drill pipe, and the protective plate rotationally connected to the surface of the drill pipe is also fixedly installed on the side of the connecting plate away from the built-in shaft.

[0008] As a preferred experimental device for coal seam fracturing combined with biological stimulation of production of the utility model, a cylindrical cavity is provided inside the drill rod.

[0009] As a preferred experimental device for coal seam fracturing combined with biological stimulation of production of the utility model, the rotating shaft and the coil spring are symmetrically arranged on both sides of the surface of the built-in shaft.

[0010] As a preferred experimental device for coal seam fracturing combined with biological production enhancement of the utility model, the spray holes are symmetrically arranged on both sides of the surface of the built-in shaft.

[0011] As a preferred experimental device for coal seam fracturing combined with biological stimulation of production of the utility model, the connecting plates are centrally symmetrically arranged on both sides of the surface of the built-in shaft.

[0012] As a preferred experimental device for coal seam fracturing combined with biological production enhancement of the utility model, the fracturing groove is fan-shaped, and the fracturing grooves are symmetrically opened on both sides of the surface of the drill pipe.

[0013] Compared with the prior art, the beneficial effect of the utility model is that the rotation of the drill rod can seal the fracturing groove during drilling, and during this process the spray hole can also be stored in the inner surface of the drill rod, which can prevent it from being affected by soil and impurities, so that the subsequent coal seam fracturing work can be carried out effectively, which can reduce the time cost of maintenance and improve the efficiency of coal seam fracturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the built-in shaft in the utility model in a rotating state;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the drill rod in the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the built-in shaft and the connecting plate in the utility model;

[0019] In the figure:

[0020] 1. Drill rod; 2. Rotating shaft; 3. Coil spring; 4. Built-in shaft; 5. Spray hole; 6. Connecting plate; 7. Protective plate; 8. Fracturing groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] like Figure 1 As shown:

[0024] An experimental device for coal seam fracturing combined with biological production enhancement comprises a drill rod 1.

[0025] In this embodiment: the existing {public announcement number}: CN212958552U discloses a multi-connected coal seam deep hole fracturing sealer; in order to solve the technical problems existing in this prior art, as disclosed in the background technology above, "when the device goes deep underground, the holes opened on its surface may be blocked under the influence of gravel and underground impurities, thereby affecting the subsequent fracturing work, and at the same time it will increase the maintenance cost and affect the normal coal seam fracturing efficiency", in terms of combined use, this problem is obviously a real problem that is difficult to solve. In view of this, in order to solve the above problems, a rotating shaft 2 and a coil spring 3 are added on this basis.

[0026] More specifically:

[0027] like Figure 1 - Figure 4 As shown:

[0028] In combination with the above content: it also includes a rotating shaft 2, a coil spring 3, a built-in shaft 4, a spray hole 5, a connecting plate 6, a protective plate 7 and a fracturing groove 8 arranged on one side of the drill pipe 1, the inner surface of the drill pipe 1 is rotationally connected to one side of the rotating shaft 2, and the surface of the rotating shaft 2 is also fixedly connected to one end of the coil spring 3, and the other end of the coil spring 3 is fixedly connected to the inner surface of the drill pipe 1, the rotating shaft 2 is also fixedly installed on the surface of the built-in shaft 4, and the built-in shaft 4 and the inner surface of the drill pipe 1 are rotationally connected, and the surface of the built-in shaft 4 is also provided with a spray hole 5, and a connecting plate 6 is also fixedly installed on one side of the built-in shaft 4, and the connecting plate 6 is slidingly connected to the fracturing groove 8 opened on the surface of the drill pipe 1, and the side of the connecting plate 6 away from the built-in shaft 4 is also fixedly provided with a protective plate 7 rotationally connected to the surface of the drill pipe 1.

[0029] In this embodiment: when the drill rod 1 is drilling, the drill rod 1 and the protective plate 7 and the borehole rotate. At this time, the protective plate 7 will drive the connecting plate 6 and the built-in shaft 4 and the rotating shaft 2 to rotate inside the drill rod 1. At the same time, the rotating shaft 2 will twist the coil spring 3 to form a certain stress, and the built-in shaft 4 will rotate slightly with the drill rod 1 and connect the spray hole 5 with the inner surface of the drill rod 1. At this time, the protective plate 7 will block the fracturing groove 8 opened on the surface of the drill rod 1. When the drill rod 1 stops rotating, the coil spring 3 will release its stress and drive the built-in shaft 4 and the protective plate 7 to rotate. The protective plate 7 will be separated from the fracturing groove 8 driven by the built-in shaft 4 and the connecting plate 6, and the spray hole 5 opened on the surface of the built-in shaft 4 will move to the position of the fracturing groove 8 driven by the coil spring 3 and the built-in shaft 4. Then, stable fracturing work can be carried out through the spray hole 5, so that the mining work can be carried out stably.

[0030] Going further:

[0031] In an optional embodiment, a cylindrical cavity is provided inside the drill rod 1 .

[0032] In this embodiment, the cylindrical cavity inside the drill pipe 1 can provide a stable installation space for the rotating shaft 2 , the coil spring 3 and the built-in shaft 4 , and provide effective conditions for the rotation of the built-in shaft 4 and the fracturing work of the spray hole 5 .

[0033] Going further:

[0034] In an optional embodiment, the rotating shaft 2 and the coil spring 3 are symmetrically arranged on both sides of the surface of the built-in shaft 4 .

[0035] In this embodiment, the rotating shaft 2 and the coil spring 3 symmetrically arranged on both sides of the surface of the built-in shaft 4 can form a stable connection between the inside of the drill rod 1 and the drill rod 1, and can provide an effective power basis for the rotation and rotation of the built-in shaft 4.

[0036] Going further:

[0037] In an optional embodiment, the spray holes 5 are symmetrically opened on both sides of the surface of the built-in shaft 4 .

[0038] In this embodiment, the spray holes 5 symmetrically arranged on the surface of the built-in shaft 4 can perform fracturing work from multiple positions, so that the water sprayed from the spray holes 5 can be used for fracturing from multiple angles, which is highly convenient.

[0039] Going further:

[0040] In an optional embodiment, the connecting plates 6 are centrally symmetrically arranged on both sides of the surface of the built-in shaft 4 .

[0041] In this embodiment: the connecting plate 6 which is centrally symmetrically arranged can drive the protective plate 7 to move through the connecting plate 6 when the built-in shaft 4 and the drill pipe 1 rotate, thereby enabling the protective plate 7 to be separated from the position where the fracturing groove 8 is located, so that the spray hole 5 has an open working space.

[0042] Going further:

[0043] In an optional embodiment, the fracturing groove 8 is fan-shaped, and the fracturing groove 8 is symmetrically opened on both sides of the surface of the drill pipe 1.

[0044] In this embodiment, the fracturing grooves 8 symmetrically arranged on both sides of the drill pipe 1 can provide a stable moving space for the connecting plate 6 and the protective plate 7, so that the spray hole 5 can perform stable fracturing after the relative displacement occurs.

[0045] The working principle and use process of the utility model are as follows: when the drill rod 1 is drilling, the drill rod 1 and the protective plate 7 and the borehole rotate, at this time the protective plate 7 will drive the connecting plate 6 and the built-in shaft 4 and the rotating shaft 2 to rotate inside the drill rod 1, and at the same time the rotating shaft 2 will twist the coil spring 3 to form a certain stress, and the built-in shaft 4 will rotate slightly with the drill rod 1 and connect the spray hole 5 with the inner surface of the drill rod 1, and the protective plate 7 will block the fracturing groove 8 opened on the surface of the drill rod 1 at this time, when the drill rod 1 stops rotating, the coil spring 3 will release its stress and drive the built-in shaft 4 and the protective plate 7 to rotate, and the protective plate 7 will be driven by the built-in shaft 4 and the connecting plate 6 to separate from the fracturing groove 8, and the spray hole 5 opened on the surface of the built-in shaft 4 will move to the position of the fracturing groove 8 driven by the coil spring 3 and the built-in shaft 4, and then stable fracturing work can be carried out through the spray hole 5, so that the mining work can be carried out stably.

[0046] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An experimental device for coal seam fracturing combined with biological stimulation, comprising a drill rod (1), characterized in that: The drill rod (1) further comprises a rotating shaft (2), a coil spring (3), an internal shaft (4), a spray hole (5), a connecting plate (6), a protective plate (7) and a fracturing groove (8), the inner surface of the drill rod (1) being rotatably connected to one side of the rotating shaft (2), and the surface of the rotating shaft (2) being fixedly connected to one end of the coil spring (3), and the other end of the coil spring (3) being fixedly connected to the inner surface of the drill rod (1), and the rotating shaft (2) being fixedly mounted on the surface of the internal shaft (4). The built-in shaft (4) is rotatably connected to the inner surface of the drill rod (1), the surface of the built-in shaft (4) is also provided with the spray hole (5), and the connecting plate (6) is fixedly mounted on one side of the built-in shaft (4), and the connecting plate (6) is slidably connected to the fracturing groove (8) provided on the surface of the drill rod (1), and the protective plate (7) rotatably connected to the surface of the drill rod (1) is also fixedly mounted on the side of the connecting plate (6) away from the built-in shaft (4).

2. The experimental device for coal seam fracturing combined with biological production enhancement according to claim 1, characterized in that: A cylindrical cavity is provided inside the drill rod (1).

3. The experimental device for coal seam fracturing combined with biological production enhancement according to claim 1, characterized in that: The rotating shaft (2) and the coil spring (3) are symmetrically arranged on both sides of the surface of the built-in shaft (4).

4. The experimental device for coal seam fracturing combined with biological production enhancement according to claim 1, characterized in that: The spray holes (5) are symmetrically arranged on both sides of the surface of the built-in shaft (4).

5. The experimental device for coal seam fracturing combined with biological production enhancement according to claim 1, characterized in that: The connecting plates (6) are centrally symmetrically arranged on both sides of the surface of the built-in shaft (4).

6. The experimental device for coal seam fracturing combined with biological production enhancement according to claim 1, characterized in that: The fracturing groove (8) is fan-shaped, and the fracturing groove (8) is symmetrically opened on both sides of the surface of the drill rod (1).

Images