CN202177524U - Inversion sealed coal sample sampler - Google Patents

Abstract

The utility model relates to a reverse sealing coal sample sampler. The utility model comprises a combined drill bit, a coal sample cylinder, a sealing disk assembly, a sealing shaft assembly, a hole sealing dial assembly and a variable diameter joint; the combined drill bit and the coal sample The upper end of the sample cylinder is connected, and the pressure plate of the sealing disk assembly presses the sealing disk on the concave platform of the coal sample cylinder. There is a coal inlet hole on the sealing disk, and the sealing sleeve of the sealing shaft assembly is sealed and connected to the through hole of the coal sample cylinder. In the hole, the dial fan of the sealing dial assembly drives the coal sample cylinder to rotate through cooperation with the dial block at the bottom of the coal sample cylinder, and the arc-shaped keyway drives the seal shaft assembly to rotate through the cooperation with the dial block on the sealing sleeve. The sampler is connected to the drill pipe through a variable diameter joint. When the drilling rig is reversed, the sealing head enters the coal inlet hole of the sealing plate to complete the coal sample sealing. The gas in the coal sample enters the gas through the quick-connect device at the end of the sealing shaft assembly. Desorption equipment for underground field gas desorption test. The utility model can be widely used in the process of measuring and detecting the gas content of coal seams in coal mines.

Description

Reverse sealed coal sampler

technical field

The utility model relates to a coal sample sampler, in particular to a reverse-sealed coal sample sampler for measuring the gas content of coal seams.

Background technique

Coal seam gas content is one of the important parameters reflecting the occurrence of coal seam gas, and it is an important basis for calculating coal seam gas reserves, predicting mine gas emission, designing gas drainage and evaluating the risk of coal and gas outburst in coal seams. The accuracy of gas content measurement not only restricts the reliability of mine gas hazard prediction, but also affects the effectiveness and economy of gas control measures based on gas hazard prediction, and even endangers mine safety production. At present, the coal seam gas content determination methods mainly include indirect method and direct method. The indirect method uses the Langmuir formula to calculate the coal seam gas content according to the measured coal seam gas pressure, coal adsorption constant, industrial analysis and other parameters. This method has a long test cycle and high cost, and is rarely used in coal mines. In the actual coal seam gas content measurement, the direct method is mainly used. The direct method is to take coal chips or coal cores through drilling holes, measure and calculate the gas loss, desorbed gas and residual gas during the sampling process. The sum of these three is the coal seam Gas content. This method has the disadvantage of excessive gas loss, especially when sampling a borehole with a sampling depth greater than 30 meters. The greater the sampling depth, the longer the coal sample exposure time during the drilling process, and the greater the gas loss. Therefore, how to reduce or accurately calculate the amount of gas loss is an urgent problem to be solved. Experiments show that the gas desorption rate of coal dust is much higher than that of lump coal. The desorption speed of coal cuttings at the initial stage of separation from the coal body is very fast. If a lumpy coal sample can be taken out, the gas loss during the sampling process will be greatly reduced. Lumpy coal sample. In addition, although many devices for directly sampling and measuring gas content have been developed at home and abroad, such as ordinary single-layer sampling pipes and double-layer sampling pipes, there is no major breakthrough in the sampling methods and principles, and the gas loss during the sampling process is serious, resulting in There are large errors in the measured coal seam gas content measurement results, which is not conducive to the formulation and effective implementation of gas control measures.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a reverse sealing coal sampler which can reduce the gas loss in the sampling process when measuring the gas content of the coal seam.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a reverse sealed coal sampler, which includes a combined drill bit, a coal sample cylinder, a sealing disc assembly, a sealing shaft assembly, a sealing dial assembly and a variable diameter joint, wherein: the inner wall of the upper end of the coal sample cylinder is provided with a concave platform, the center of the bottom is provided with a through hole, and the bottom surface is provided with a number of raised shifting blocks around the through hole; the upper end of the coal sample cylinder and the combined drill bit fixedly connected into one; the sealing disc assembly includes a gland and a sealing disc, and a number of coal inlet holes are opened on the sealing disc, and the sealing disc is located on the concave platform of the coal sample cylinder, and the gland Penetrate the coal sample cylinder and press it on the sealing plate, and be fixedly connected with the upper end of the coal sample cylinder as a whole; the sealing shaft assembly includes a hollow shaft, a sealing sleeve, a dial key, a quick-connect device and Reversing sealing assembly; the top of the hollow shaft is closed, and there are several exhaust holes on the shaft body; the sealing sleeve is arranged at the lower part of the hollow shaft, and is sealed and connected in the through hole of the coal sample cylinder; the The dial key is set at the lower part of the outer wall of the sealing sleeve; the quick-connect device is connected to the tail end of the sealing sleeve; the reverse sealing assembly is located at the upper part of the sealing shaft assembly, including a pin seat; the pin seat is perforated with a hole sealing pin corresponding to each of the coal inlet holes on the sealing disc, and the upper end of the hole sealing pin is provided with a sealing head, and the bottom of the sealing head and the A compression spring is arranged between the pin seats, and a hole pin is arranged at the lower part of each sealing pin; the sealing dial assembly includes a dial and a pressing plate; the dial is an inverted cylindrical shape, so A central hole is provided at the bottom of the dial, and a dial fan is arranged around the central hole to cooperate with the dial block at the bottom of the coal sample cylinder. The inner wall of the central hole is provided with an arc-shaped keyway; the pressing plate penetrates the dial and is connected to the dial at the bottom of the coal sample cylinder through a fixing piece; the upper end of the variable diameter joint is fixed to the lower end of the dial of the sealing dial assembly connected into one.

The combined drill bit includes a drill bit seat on which a central drill bit and several small drill bits surrounding the central drill bit are arranged.

2 to 4 coal inlet holes are opened on the sealing plate.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. The utility model shortens the coal sample exposure time in the sampling process due to the adoption of reverse sealing sampling, thereby greatly reducing the gas loss in the sampling process, Improved accuracy of gas content measurements. 2. Since the utility model adopts the upper and lower sealed coal sample cylinders for gas desorption, there is no need to transfer the coal samples in the coal sample cylinder during the gas desorption test process, and the gas desorption is directly connected to the desorption equipment through the quick-connect device, thereby reducing the need for downhole gas desorption. The loss of gas during the desorption test is beneficial to the accurate determination of the gas content. 3. The utility model is especially suitable for directly sampling and measuring the gas content of coal seams in medium-soft outburst coal seams because the utility model adopts the form of external expansion and internal drilling combination drill bits to collect coal samples. 4. The utility model can be widely used in the process of measuring and detecting the gas content of coal seams in coal mines.

Description of drawings

Fig. 1 is a structural representation of the utility model

Fig. 2 is a schematic structural view of the utility model when it is in a sealed state

Fig. 3 is a schematic diagram of the utility model combination drill bit

Fig. 4 is a schematic sectional view of A-A of Fig. 1

Fig. 5 is a schematic sectional view of A-A of Fig. 2

Figure 6 is a comparison diagram of on-site implementation effects

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail. For ease of description, "up" and "down" hereinafter are consistent with the up and down directions in the accompanying drawings, but during use, the device is used horizontally, and the direction of "up" is towards the coal seam.

As shown in Figure 1, the utility model includes a combination drill bit 1, a coal sample cylinder 2, a sealing disc assembly 3, a sealing shaft assembly 4, a hole sealing dial assembly 5 and a reducing joint 6.

As shown in Fig. 1 and Fig. 3, the combination drill bit 1 of the present utility model comprises a cylindrical drill bit seat 11, and a center drill bit 12 is arranged at the central position of the drill bit seat 11, with the center drill bit 12 as the center, at the center of the drill bit seat 11 Four small drill bits 13 are evenly arranged on the same circumference, and eight small drill bits 14 are evenly arranged on the top of the drill bit seat 11 cylinder wall. The inner wall of the lower end of the drill seat 11 is provided with threads.

As shown in Figure 1, the inner wall of the upper end of the coal sample cylinder 2 of the utility model is provided with a circle of concave platform 21, and the center of the bottom of the coal sample cylinder 2 is provided with a through hole 22, and the bottom surface of the coal sample cylinder 2 is provided with three protrusions around the through hole 22. The wedge-shaped shifting block 23 raised, the wedge-shaped shifting block 23 and the coal sample cylinder 2 are integrally formed, and each wedge-shaped shifting block 23 is provided with a bolt hole 24 in its vertical direction. The upper end of the coal sample cylinder 2 is fixedly connected as one with the lower end of the drill bit seat 11 of the combination drill bit 1 through the external thread thereon.

The sealing disk assembly 3 of the utility model includes an annular gland 31 and a circular sealing disk 32 . A circular coal inlet 33 is opened on the same circumference of the sealing disc 32, and the number of the coal inlet 33 can be two or four, and the following only takes three as an example for illustration. The sealing disc 32 is seated on the recessed platform 21 of the coal sample cylinder 2 , and a sealing rubber ring 34 is provided at the part where the bottom of the sealing disc 32 is in contact with the recessed platform 21 . The gland 31 penetrates into the coal sample cylinder 2 and is pressed onto the sealing plate 32, and is fixedly connected with the upper end of the coal sample cylinder 2 as a whole through the external thread thereon.

The sealing shaft assembly 4 of the utility model includes a hollow shaft 41 , a sealing sleeve 42 , a toggle key 43 , a quick connecting device 44 and a reverse sealing assembly 45 . The top of the hollow shaft 41 is closed, and several exhaust holes 46 with a diameter of 2 to 4 mm are arranged on the shaft body. The sealing sleeve 42 is arranged at the bottom of the hollow shaft 41, and is integrally formed with the hollow shaft 41, or welded into one body. The sealing sleeve 42 and the through hole 22 of the coal sample cylinder 2 are sealed and connected by a sealing rubber ring 47. The sealing sleeve 42 A toggle key 43 is arranged on the lower outer wall. The quick-connect device 44 is screwed to the tail end of the sealing sleeve 42. The end of the quick-connect device 44 is provided with a switchable air valve 48. Before the external gas desorption equipment is connected to the gas desorption test, the air valve 48 is always in the closed state.

The reverse seal assembly 45 is located on the upper part of the seal shaft assembly 4, and includes three pin seats 451 integrally connected with the hollow shaft 42. The number of pin seats 451 can be two or four, and only three are used as an example below Be explained. Three hole sealing pins 452 corresponding to the number of coal inlet holes 33 of the sealing disc 32 are perforated on the pin seat 451, and a rubber cone sealing head matching with the coal inlet hole 33 is provided on the upper end of each hole sealing pin 452 453, a compression spring 454 is arranged between the bottom of each sealing head 453 and the pin seat 451, and a hole pin 455 is inserted at the bottom of each sealing pin 452, and the hole pin 455 is used to prevent the hole sealing pin 452 from Under the action of the compression spring 454, it pops out from the pin seat 451.

As shown in FIG. 4 and FIG. 5 , the sealing dial assembly 5 of the present invention includes a dial 51 and a pressing plate 52 . The dial 51 is in an inverted cylindrical shape. There is a central hole in the center of the bottom of the cylinder. Around the central hole, there are three dialing fans 53 that cooperate with the dial block 23 at the bottom of the coal sample cylinder 2. On the inner wall of the central hole, there is a fan 53 that is connected to the sealing sleeve 42. The arc-shaped key groove 54 that dial key 43 cooperates, and the lower inner wall of the tube is provided with threads. Three through holes 55 are opened on the pressure plate 52, and the pressure plate 52 is penetrated into the dial 51, so that the bottom of the dial 51 is pushed against the bottom of the coal sample cylinder 2, and then fixedly connected with the three dials 23 at the bottom of the coal sample cylinder 2 by bolts Together, at this moment, the fixing between the pressing plate 52 and the shifting block 23 does not affect the rotation of the dial 51, and the rotation angle of the dial 51 is at most 30°.

The variable diameter joint 6 of the utility model is fixedly connected with the lower end of the dial 51 through the external thread on its upper end to form a whole.

When the utility model uses, comprise the following steps:

1) Insert the sealing shaft assembly 4 from the top of the coal sample cylinder 2, so that the sealing sleeve 42 is sealed and connected in the through hole 22 of the coal sample cylinder 2;

2) Set the dial 51 on the sealing sleeve 42, make the three dials 53 on the dial 51 lean against the sides of the three dials 23 at the bottom of the coal sample cylinder 2, and make the dials on the sealing sleeve 42 43 is inserted into the arc-shaped keyway 54 on the dial 51 (as shown in Figure 4), and then the pressure plate 52 is sleeved on the sealing sleeve, and is fixedly connected with the shifting block 23 at the bottom of the coal sample cylinder 2 through bolts;

3) Put the sealing plate 32 in the concave platform on the upper part of the coal sample cylinder 2, so that the sealing head 453 is located at the bottom of the sealing plate 32; then connect the gland 31 with the inner wall of the upper end of the coal sample cylinder 2 through threads, and press it on the sealing surface. on disc 32;

4) The combined drill bit 1 is fixedly connected to the outer wall of the upper end of the coal sample cylinder 2 through threads, and the upper end of the reducing joint 6 is connected to the lower end of the dial 51 through threads;

5) First construct the drill hole to a predetermined depth, withdraw the drill pipe, and then connect the utility model installed according to steps 1 to 4 to the drilling rig and the drill pipe through the reducing joint 6, and send it into the borehole for fixed-point sampling;

6) The drill pipe of the drilling rig rotates clockwise, and the dial 51 is driven to rotate through the reducing joint 6, and the dial 51 pushes the dial 23 to drive the coal sample cylinder 2 to rotate through the dial fan 53 on it, and the coal sample cylinder 2 drives the combination The central drill bit 12 on the drill bit 1 takes out the lump coal sample from the coal seam, and the small drill bits 13 and 14 grind the lump coal sample into coal chips smaller than 20mm, and the coal chips enter the coal sample through the coal inlet hole 33 opened by the sealing disc 32 Inside the cylinder 2;

7) After the sampling is completed, the drilling rig is reversed counterclockwise to drive the dial 51 to rotate 30° (as shown in Figure 5). The three sealing heads 453 on the reverse sealing assembly 45 are pushed into the coal inlet 33 by the compression spring 454 during the rotation process, the coal inlet 33 is closed, and the coal sample is sealed;

8) Exit the drill pipe, remove the utility model from the drill pipe, open the gas valve 48 of the quick-connect device 44, and connect the quick-connect device 44 with the external gas desorption equipment. At this time, the gas in the coal sample The gas enters the hollow shaft 41 through the exhaust hole 46 on the hollow shaft 41, and then enters the external gas desorption equipment for the downhole field gas desorption test.

In the above examples, in order to prevent the heat of the drill head from intensifying the gas desorption of the coal sample, the rotational speed of the drilling rig should be controlled within 60-100 r/min, the drilling stroke should be about 0.6 m-1 m, and the sampling time should be about 3-5 minutes.

In the above embodiment, after the sealing of the coal sample is completed, the pressure resistance value inside the sealed coal sample cylinder 2 can reach up to 1.5 MPa.

The field test uses the test result of the present utility model and uses the test result of traditional device to compare below. The field test was carried out at the No. 24 drilling site of Floor Lane 715 in the Qinan Mine of Huaibei Mining Group. According to the research results of the division of coal seam outburst dangerous areas, the 715 working face is in the outburst dangerous area. When the drilling construction reaches the coal, record the initial exposure time of the coal sample, and withdraw the drill pipe; connect the utility model with the drilling rig, send it into the drilling hole, and when it reaches the sampling position, record the sampling start time; start drilling and sampling, and the rotation speed Keep at 60-100 rpm to avoid the heat of the drill head aggravating the gas desorption of the coal sample. Drill 0.6m-1m. When the sampling is completed, the drilling rig is reversed counterclockwise by more than 30° to complete the sealing of the coal sample and record the end of sampling. time; exit the drill pipe and the utility model, without transferring the coal sample, directly use the terminal quick connection device of the utility model to connect the gas desorption equipment, record the downhole desorption time, and carry out the downhole gas desorption for 30 minutes. An additional sampling hole was constructed at Site 24, but gas desorption was performed using conventional core tube sampling.

The coal sample exposure time is 5 minutes during the reverse sealing sampling process, the desorption volume is 694ml in 30 minutes underground, the normal pressure natural desorption volume is 2397ml, and the coal sample quality is 676.6g; the traditional rock sample tube sampling starts and the coal sample is loaded into the coal sample tank and the desorption exposure time is 25min , the desorption volume is 242ml in 30 minutes downhole, the natural desorption volume under normal pressure is 1154ml, and the coal sample mass is 583.8g. For the convenience of comparison and analysis, the desorption amount of the two sampling methods for 30 minutes underground is converted into the desorption amount under the unit mass coal standard state (as shown in Figure 6). The test results show that the utility model has significantly higher gas desorption amount for 30 minutes underground Samples were taken from conventional rock sample tubes. Because the coal sample is sealed in the sampling method of the utility model during the back drilling process, the coal sample gas is desorbed in the sampling cylinder, which causes the gas pressure in the coal sample cylinder to rise. The desorption amount reaches 0.7823ml/g, which is 34.6 times of the 1min gas desorption amount of traditional rock sample tube sampling coal samples. Compared with the traditional rock sample tube sampling method, the utility model can greatly shorten the coal sample exposure time, reduce the gas loss during the sampling process, and thus reduce the gas content measurement caused by the excessive estimation of the gas loss. error, the measurement results are more reliable.

The above-mentioned embodiments are only used to illustrate the utility model, wherein the structure, connection mode and manufacturing process of each component can be changed to some extent, and all equivalent transformations and improvements carried out on the basis of the technical solution of the utility model are applicable. It should not be excluded from the protection scope of the present utility model.

Claims (3)

1. A reverse sealed coal sampler, characterized in that it includes a combined drill bit, a coal sample cylinder, a sealing disc assembly, a sealing shaft assembly, a sealing dial assembly and a variable diameter joint, wherein: The inner wall of the upper end of the coal sample cylinder is provided with a concave platform, the center of the bottom is provided with a through hole, and the bottom surface is provided with several raised shifting blocks around the through hole; the upper end of the coal sample cylinder is fixedly connected with the combined drill bit; The sealing plate assembly includes a gland and a sealing plate, and a number of coal inlet holes are opened on the sealing plate, and the sealing plate is located on the concave platform of the coal sample cylinder, and the gland penetrates into the coal sample The sample cylinder is pressed on the sealing plate, and is fixedly connected with the upper end of the coal sample cylinder as a whole; The sealed shaft assembly includes a hollow shaft, a sealing sleeve, a dial key, a quick connection device and a reverse sealing assembly; the top of the hollow shaft is closed, and a number of vent holes are opened on the shaft body; the sealing sleeve is arranged on The lower part of the hollow shaft is sealed and connected in the through hole of the coal sample cylinder; the dial key is arranged at the lower part of the outer wall of the sealing sleeve; the quick-connect device is connected to the tail end of the sealing sleeve; The reverse seal assembly is located on the upper part of the seal shaft assembly, and includes a pin seat connected to the hollow shaft; the pin seat is pierced with holes corresponding to each of the coal inlet holes on the sealing disc. A hole-sealing pin, the upper end of the hole-sealing pin is provided with a sealing head, a pressure spring is provided between the bottom of the sealing head and the pin seat, and a hole pin is provided at the bottom of each of the hole-sealing pins; The sealing dial assembly includes a dial and a pressing plate; the dial is in an inverted cylindrical shape, a central hole is arranged at the bottom of the dial, and a dial with the bottom of the coal sample cylinder is arranged around the central hole. The inner wall of the center hole is provided with an arc-shaped keyway that matches the dial key on the sealing sleeve; the pressure plate penetrates the dial and is connected to the bottom of the coal sample cylinder through a fixing piece. on the block; The upper end of the reducing joint is fixedly connected with the lower end of the dial of the sealing dial assembly. 2. A reverse sealed coal sampler as claimed in claim 1, characterized in that: said combined drill bit comprises a drill bit base, said drill bit base is provided with a central drill bit and several small drill bits surrounding said central drill bit . 3. A reverse sealed coal sampler according to claim 1 or 2, characterized in that 2 to 4 coal inlet holes are opened on the sealing plate.

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