CN105003204B - Punching device for coalbed methane mining physical simulation test - Google Patents

Abstract

The invention discloses a punching device for a physical simulation test of coalbed methane exploitation, which comprises a base and an optical axis fixed along the length direction of the base, a mounting seat is looped on the optical axis, and a first connecting seat is connected between the mounting seat and the base. Drive device, driven by the first drive device, the mounting base moves along the optical axis; a rotating shaft parallel to the optical axis is installed on the top surface of the mounting base, a through hole is opened in the rotating shaft, and a collector is connected to one end of the rotating shaft. The water tank, and the through hole in the rotating shaft communicates with the inner cavity of the water collection tank, and the other end of the rotating shaft is connected with a coaxial nozzle pipe, the inner hole of the nozzle pipe communicates with the through hole in the rotating shaft, and the other end of the nozzle pipe is fixed with a The nozzle; the rotating shaft is also connected with a second driving device, driven by the second driving device, the rotating shaft, the spray pipe and the nozzle rotate. The above structure provides a punching device with a simple structure and is convenient for use in the laboratory for physical simulation tests of coalbed methane exploitation, which has the characteristics of ingenious conception, easy production and low production cost.

Description

Punching device for physical simulation test of coalbed methane exploitation

technical field

The invention relates to a punching device for a physical simulation test of coalbed methane exploitation, which is mainly used for completing the punching step of the physical simulation test of coalbed methane exploitation.

Background technique

At present, coal seams contain a large amount of coalbed methane, also known as gas, which is not only a valuable resource, but also an important part of the outburst potential of coal and gas in underground coal mining. my country is a country with abundant coal resources. With the rapid development of the coal industry and the sudden increase in scale, the amount of gas gushing out has increased, and the number of coal mine accidents caused by gas outbursts and explosions has risen rapidly. At the same time, coalbed methane is a high-quality and clean fuel. If it is properly developed, recycled and utilized, it can not only reduce the occurrence of coal mine accidents, ensure the normal production of coal mines, but also solve the problem of energy shortage in our country. However, my country's geological conditions are complex, and the permeability of coal rocks is low. The permeability is just a sign that reflects the difficulty of fluid migration in coal rocks. At the same time, it is also an important parameter for formation damage evaluation and natural gas mining design. The existing main technical solutions for increasing the coal seam gas extraction rate include: large-diameter intensive drilling, hydraulic punching, hydraulic fracturing frame proppant technology, hydraulic slotting, etc. Among them, hydraulic punching is mainly to flush out part of the coal body and gas in the coal seam through medium and high pressure water, so as to relieve pressure, increase the air permeability of the coal seam, reduce the elastic potential energy of the coal body, reduce the gas and desorption speed of the coal body, and reduce the gas expansion energy. Effect.

Existing experimental research on coalbed methane mining is mainly to simulate the relationship of coal seam permeability with the change of stress, gas pressure and temperature under pseudo-triaxial conditions, and propose various methods to improve coal seam permeability on this basis. Although these seepage simulation tests have explained the influence of various influencing factors on the flow of coalbed methane to a certain extent, in view of the complexity of coalbed methane mining work, these simulated states are far from the actual situation on site, and cannot fully explain the actual situation. CBM extraction under these conditions is affected by various factors. Therefore, those skilled in the art are devoting themselves to developing a test device capable of physically simulating the exploitation of coalbed methane in the laboratory, among which the research on the hydraulic punching process requires the design of a device that is convenient for punching.

Contents of the invention

The technical problem to be solved by the present invention is to provide a punching device for physical simulation test of coalbed methane exploitation with simple structure and convenient use.

The technical scheme of the present invention is as follows: a punching device for a physical simulation test of coalbed methane exploitation, comprising a long basket-shaped base with an open upper end, and at least one optical axis is fixed in the opening of the base along its length direction , a mounting seat is looped on the optical axis, and a first driving device is connected between the mounting seat and the base. Driven by the first driving device, the mounting seat moves along the optical axis; A rotating shaft is installed on the top surface of the rotating shaft, the center line of the rotating shaft is parallel to the center line of the optical axis, a through hole is opened in the rotating shaft, a water collecting tank is connected to one end of the rotating shaft, and the through hole in the rotating shaft is connected to the water collecting tank The inner cavity of the nozzle communicates with each other, and the other end of the rotating shaft is connected with a coaxial nozzle, one end of the nozzle is connected with the rotating shaft, and the inner hole of the nozzle communicates with the through hole in the rotating shaft. The other end is fixed with a nozzle; a second driving device is also connected to the rotating shaft, and driven by the second driving device, the rotating shaft, the spray pipe and the nozzle rotate.

With the above-mentioned structure, by installing a mounting base that can move along the optical axis on the base, and installing a nozzle and a nozzle that can rotate with the rotating shaft on the mounting base, a coalbed methane mining device with a simple structure that is convenient for use in the laboratory is provided. The punching device for physical simulation test, in use, only needs to fix the base in an appropriate position, make the nozzle extend into the pre-buried hole of the coal seam in the simulation experiment, and then drive the mounting base to move and the nozzle to rotate at the same time, to simulate punching It is very convenient to operate and use.

The first driving device includes a handle, a screw and a nut, the screw is installed in the opening of the base, and the centerline of the screw is arranged parallel to the centerline of the optical axis, and the end of the screw extends away from the nozzle. out of the base, and a handle is installed on the end of the screw rod, and a nut is set on the screw rod, and the nut is installed on the mounting seat. When the handle rotates, the mounting seat is driven by the screw rod and the nut. Move along the optical axis. The first driving device has a simple structure and is easy to use.

The second driving device includes a driven wheel, a driving wheel, a belt and a motor, the motor is fixed on the top surface of the mounting seat, and the centerline of the output shaft of the motor is parallel to the centerline of the rotating shaft, and the output shaft of the motor is connected with a The driving wheel of the shaft is fixedly sheathed with a driven wheel in the middle part of the rotating shaft, and a belt is set on the driving wheel and the driven wheel. The structure of the second driving device is simple, and a motor is used to drive the rotating shaft to rotate, and the rotating speed of the rotating shaft and the nozzle can be controlled by controlling the rotating speed of the motor.

Preferably, the nozzle includes a coaxial first threaded section, a square rod-shaped first connecting section and a first tapered section, and the four edges of the first connecting section are provided with circular first chamfers, And the central axis of each first chamfer is on the same straight line as the central axis of the nozzle; one end of the first connecting section extends outward to form a first threaded section, and the first threaded section extends into the nozzle of the nozzle. The other end of the first connecting section extends outwards and gradually narrows to form a first conical section, and the apex of the first conical section is flattened into a circle; There is a coaxial first spray hole in the nozzle, one end of the first spray hole communicates with the inner hole of the spray pipe, and the other end of the first spray hole is tapered and extends into the first tapered section. The middle part of the first tapered section is provided with three evenly distributed second nozzle holes, the center line of the second nozzle hole is arranged obliquely with the central axis of the first tapered section, and one end of the second nozzle hole is connected to the first nozzle hole. Through, the other end of the second spray hole runs through the conical surface of the first conical section. The structure of the nozzle is simple, which is convenient for punching deeper holes in the coal seam. The square rod-shaped first connecting section makes the installation and disassembly of the nozzle more labor-saving and convenient.

As another preference, the nozzle includes a coaxial second threaded section, a square rod-shaped second connecting section, a spray hole section and a second tapered section, and the four edges of the second connecting section are provided with circles. shaped second chamfer, and the central axis of each second chamfer is on the same line as the central axis of the nozzle; one end of the second connecting section extends outward to form a second thread section, and the second The threaded section extends into the inner hole of the nozzle pipe and is threadedly connected with the nozzle pipe. The other end of the second connection section is integrally connected with an equilateral triangular columnar nozzle hole section, and the three edges of the nozzle hole section are provided with A circular third chamfer, the central axis of the third chamfer is also on the same line as the central axis of the nozzle, and one side of the equilateral triangle of the nozzle hole section coincides with one side of the second connecting section; The outer end of the nozzle hole section extends outwards and gradually narrows to form a second tapered section, the apex of the second tapered section is flattened into a circle; a coaxial third nozzle hole is opened in the nozzle , one end of the third nozzle hole communicates with the inner hole of the nozzle pipe, the other end of the third nozzle hole passes through the nozzle hole section and extends into the second tapered section in a tapered shape, and opens in the nozzle hole section There are three fourth nozzle holes evenly distributed in the circumferential direction, the plane where the center line of the fourth nozzle hole is located is perpendicular to the central axis of the nozzle hole section, one end of the fourth nozzle hole is connected with the third nozzle hole, and the other end of the fourth nozzle hole is It runs through the middle of the third chamfer of the nozzle hole section. The structure of the nozzle is simple, and it is convenient to punch out a cylindrical hole in the coal seam. The square rod-shaped second connecting section makes the installation and disassembly of the nozzle more labor-saving and convenient.

At least one helical piece is fixed on the outer wall of the nozzle, and the helical piece is arranged around the center line of the nozzle. The setting of the spiral piece is convenient for drainage and slag discharge.

Preferably, there are three spiral fins.

The mounting seat is composed of a top plate and two support plates vertically connected under the top plate, and the two support plates are arranged oppositely. The mounting seat has a simple and stable structure.

Preferably, two optical axes are arranged side by side.

Beneficial effects: the present invention provides a CBM with a simple structure and is convenient to use in the laboratory by installing a mounting seat that can move along the optical axis on the base, and installing a nozzle and a nozzle that can rotate with the rotating shaft on the mounting seat. The punching device for mining physics simulation test has the characteristics of ingenious design, convenient use, easy production and low production cost.

Description of drawings

Fig. 1 is the structural representation of embodiment 1.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is an enlarged view of part I of Fig. 1 .

Fig. 4 is a left side view of Fig. 3 .

FIG. 5 is a cross-sectional view along line A-A of FIG. 2 .

Fig. 6 is a schematic structural view of the nozzle in embodiment 2.

FIG. 7 is a cross-sectional view along line A-A of FIG. 6 .

FIG. 8 is a rear view of FIG. 6 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary for the purpose of explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that for orientation words, such as the term "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise " and other indication orientations and positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or in a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention. In addition, terms such as "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features.

In the present invention, unless otherwise clearly specified and limited, terms such as "assemble", "connect", "connect", "fix" and other terms should be interpreted in a broad sense, for example, it can be a fixed connection or a fixed connection. Detachable connection, or integral connection; it can also be mechanical connection or electrical connection; it can be direct connection or connection through an intermediary, and it can be that two components are internally connected. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the invention, unless otherwise specified and limited, a first feature being "on" or "under" a second feature may include that the first and second features are in direct contact, or that the first and second features are not in direct contact. Rather, through additional characteristic contact between them. Moreover, "above", "below" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature the height of. "Above", "under" and "beneath" the first feature on the second feature include that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

The technical solutions and beneficial effects of the present invention will be clearer and more definite by further describing the specific embodiments of the present invention in conjunction with the accompanying drawings.

Example 1:

As shown in Fig. 1, Fig. 2 and Fig. 4, the present invention includes a strip-shaped basket-shaped base 1 with an open upper end, and at least one optical axis 2 is fixed in the opening of the base 1 along its length direction. For example, two optical axes 2 are preferably arranged side by side. A mounting seat 5 is looped on the optical axis 2, and the mounting seat 5 is composed of a top plate 5a and two support plates 5b vertically connected below the top plate, and the two support plates 5b are arranged opposite to each other. The optical axis 2 passes through the support plate 5b vertically. A first driving device is connected between the mounting base 5 and the base 1 , driven by the first driving device, the mounting base 5 moves along the optical axis 2 . The first driving device includes a handle 9 , a screw 3 and a nut 14 , the screw 3 is installed in the opening of the base 1 , and the centerline of the screw 3 is arranged parallel to the centerline of the optical axis 2 . The end of the threaded mandrel 3 away from the nozzle 8 protrudes from the base 1 , and a handle 9 is installed at the end of the threaded mandrel 3 . A nut 14 is sleeved on the screw rod 3, and the nut 14 is mounted on the mounting base 5. When the handle 9 rotates, the mounting base 5 moves along the optical axis 2 driven by the screw rod 3 and the nut 14.

As shown in Figure 1, Figure 2 and Figure 4, a rotating shaft 7 is installed on the top surface of the mounting seat 5 through a bearing and a bearing support, the center line of the rotating shaft 7 is parallel to the center line of the optical axis 2, and A through hole 7 a is opened in the rotating shaft 7 , and the water collecting tank 4 is connected to one end of the rotating shaft 7 , and the through hole 7 a in the rotating shaft 7 communicates with the inner cavity of the water collecting tank 4 . The other end of the rotating shaft 7 is connected with a coaxial spray pipe 8, one end of the spray pipe 8 is connected with the rotating shaft 7, and the inner hole of the spray pipe 8 communicates with the through hole 7a in the rotating shaft 7. The other end of the tube 8 is fixed with a nozzle 13; a second driving device is also connected to the rotating shaft 7, and driven by the second driving device, the rotating shaft 7, the spray pipe 8 and the nozzle 13 rotate. Described second driving device comprises driven wheel 6, driving wheel 11, belt 12 and motor 10, and described motor 10 is fixed on mounting base 5 top surfaces, and the output shaft center line of described motor 10 is parallel with the center line of rotating shaft 7, A coaxial driving wheel 11 is connected to the output shaft of the motor 10 , a driven wheel 6 is sheathed in the middle of the rotating shaft 7 , and a belt 12 is sheathed on the driving wheel 11 and the driven wheel 6 .

As shown in Figure 1, Figure 3 and Figure 4, the nozzle 13 includes a coaxial first threaded section 131, a square rod-shaped first connecting section 132 and a first conical section 133, the first connecting section 132 The four edges are all provided with circular first chamfers 132 a , and the central axis of each first chamfer 132 a is located on the same straight line as the central axis of the nozzle 8 . One end of the first connecting section 132 extends outwards to form a first threaded section 131, the first threaded section 131 extends into the inner hole of the nozzle pipe 8 and is threadedly connected with the nozzle pipe 8, the first connecting section 132 The other end of the first tapered section 133 extends outwards and gradually narrows to form a first tapered section 133 , and the top of the first tapered section 133 is flattened to form a circle. In the nozzle 13, there is a coaxial first spray hole 13a, one end of the first spray hole 13a communicates with the inner hole of the spray pipe 8, and the other end of the first spray hole 13a is tapered and extends into the first spray hole 13a. In the conical section 133, three uniformly distributed second nozzle holes 133a are opened in the middle of the first conical section 133, and the centerline of the second nozzle holes 133a is inclined to the central axis of the first conical section 133 Arrangement, one end of the second spray hole 133a is connected with the first spray hole 13a, and the other end of the second spray hole 133a is passed through the conical surface of the first tapered segment 133 . At least one spiral piece 15 is fixed on the outer wall of the nozzle 8 , and the spiral piece 15 is arranged around the centerline of the nozzle 8 . There are three spiral pieces 15.

Example 2:

As shown in FIG. 6 , FIG. 7 and FIG. 8 , the nozzle 13 includes a coaxial second threaded section 134 , a square rod-shaped second connecting section 135 , an orifice section 136 and a second tapered section 137 . The four edges of the second connecting section 135 are provided with round second chamfers 135 a, and the central axis of each second chamfer 135 a is on the same line as the central axis of the nozzle 8 . One end of the second connecting section 135 extends outward to form a second threaded section 134, and the second threaded section 134 extends into the inner hole of the nozzle pipe 8 and is threadedly connected with the nozzle pipe 8. The second connecting section 135 The other end of the nozzle is integrally connected with an equilateral triangular columnar spray hole section 136, and the three edges of the spray hole section 136 are all provided with a circular third chamfer 136b, and the central axis of the third chamfer 136b is also aligned with the The central axis of the nozzle pipe 8 is located on the same straight line, and one side of the equilateral triangle of the nozzle section 136 coincides with one side of the second connecting section 135 . The outer end of the nozzle section 136 extends outwards and gradually narrows to form a second tapered section 137 , the cone top of the second tapered section 137 is flattened to form a circle. A coaxial third spray hole 13b is opened in the nozzle 13, one end of the third spray hole 13b communicates with the inner hole of the spray pipe 8, and the other end of the third spray hole 13b passes through the spray hole section 136 and Extending into the second tapered section 137 in a conical shape, there are three fourth spray holes 136a uniformly distributed in the circumferential direction in the spray hole section 136, and the plane where the center line of the fourth spray hole 136a is in the same plane as the spray hole section 136 The central axis of the fourth injection hole 136a is vertical, one end of the fourth injection hole 136a passes through the third injection hole 13b, and the other end of the fourth injection hole 136a passes through the middle of the third chamfer 136b of the injection hole section 136. There is no helical piece on the outer wall of the nozzle 8, and the other structures of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Claims (7)

1. a kind of coal-bed gas exploitation physical simulation experiment hole punched device, it is characterised in that：Including the strip basket that upper end is open Shape base (1), is fixed with least one optical axis (2), in the optical axis along its length in the opening of the base (1) (2) kink has mounting seat (5) on, and first driving means are connected between the mounting seat (5) and base (1), is driven first Under the driving of dynamic device, mounting seat (5) is mobile along optical axis (2)；Rotating shaft (7), institute are installed on the top surface of the mounting seat (5) The center line of rotating shaft (7) and the centerline parallel of optical axis (2) are stated, through hole (7a) is provided with rotating shaft (7), in the rotating shaft (7) The through hole (7a) that is connected with header tank (4), and rotating shaft (7) of one end communicated with the inner chamber of header tank (4), in the rotating shaft (7) the other end is connected with coaxial jet pipe (8), and one end of the jet pipe (8) is connected with rotating shaft (7), and jet pipe (8) is interior Hole is connected with the through hole (7a) in rotating shaft (7), and nozzle (13) is fixed with the other end of the jet pipe (8)；In the rotating shaft (7) On be also associated with the second drive device, under the driving of the second drive device, the rotating shaft (7), jet pipe (8) and nozzle (13) turn It is dynamic；

The nozzle (13) includes coaxial the second thread segment (134), shaft-like second linkage section (135) of square, spray orifice section (136) and the second conical section (137), four ribs of second linkage section (135) are equipped with second chamfering (135a) of circle, And central shaft of the central shaft of every 1 second chamfering (135a) with jet pipe (8) is located along the same line；Second connection One end of section (135) stretches out to form the second thread segment (134), and second thread segment (134) stretches into the endoporus of jet pipe (8) In and be threadedly coupled with jet pipe (8), the other end of second linkage section (135) is connected with the spray of equilateral triangle column Hole section (136), three ribs of spray orifice section (136) are equipped with the 3rd chamfering (136b) of circle, the 3rd chamfering The central shaft of (136b) is also located at same straight line with the central shaft of jet pipe (8), and spray orifice section (136) equilateral triangle Wherein while with the second linkage section (135) wherein while overlapping；The outer end of spray orifice section (136) stretches out and gradually contracts The second conical section of small formation (137), the vertex of a cone of second conical section (137) scabbles rounded；Opened in the nozzle (13) There is the 3rd coaxial spray orifice (13b), one end of the 3rd spray orifice (13b) connects with the endoporus of jet pipe (8), the 3rd spray orifice The other end of (13b) is through spray orifice section (136) and tapered the second conical section (137) that stretches into is interior, in spray orifice section (136) It is provided with three the 4th uniform spray orifices (136a) of circumference, center line place plane and the spray orifice section of the 4th spray orifice (136a) (136) central axis, one end of the 4th spray orifice (136a) and the 3rd spray orifice (13b) insertion, the 4th spray orifice (136a) it is another One end is through the middle part of spray orifice (136) the 3rd chamferings (136b) of section.

2. coal-bed gas exploitation physical simulation experiment hole punched device according to claim 1, it is characterised in that：Described first Drive device includes handle (9), screw mandrel (3) and nut (14), and the screw mandrel (3) is in the opening of base (1), and silk The center line of bar (3) arranges that the screw mandrel (3) stretches out base away from one end of jet pipe (8) with the centerline parallel of optical axis (2) (1) handle (9), and at the end of screw mandrel (3) is installed, nut (14), the nut (14) is cased with the screw mandrel (3) In mounting seat (5), when handle (9) is rotated, the mounting seat (5) is in screw mandrel (3) and the drive lower edge of nut (14) Optical axis (2) is mobile.

3. coal-bed gas exploitation physical simulation experiment hole punched device according to claim 1, it is characterised in that：Described second Drive device includes driven pulley (6), driving wheel (11), belt (12) and motor (10), and the motor (10) is fixed on mounting seat (5) top surface, and output shaft centre line and the rotating shaft (7) of motor (10) centerline parallel, on the output shaft of motor (10) Coaxial driving wheel (11) is connected with, driven pulley (6) is installed with rotating shaft (7) middle part, in the driving wheel (11) and driven pulley (6) belt (12) is cased with.

4. the coal-bed gas exploitation physical simulation experiment hole punched device according to claim 1 or 2 or 3, it is characterised in that： At least one flight (15) is fixed with the outer wall of the jet pipe (8), center line cloth of the flight (15) around jet pipe (8) Put.

5. coal-bed gas exploitation physical simulation experiment hole punched device according to claim 4, it is characterised in that：The spiral Piece (15) has three.

6. coal-bed gas exploitation physical simulation experiment hole punched device according to claim 5, it is characterised in that：The installation Seat (5) is made up of top board (5a) and two pieces of supporting plates (5b) being vertically connected to below top board, and two pieces of supporting plates (5b) are relative Arrangement.

7. coal-bed gas exploitation physical simulation experiment hole punched device according to claim 6, it is characterised in that：The optical axis (2) two have been arranged side by side.