CN206035427U - Fill water pressurize cooling and creep into device of getting coal core - Google Patents

Abstract

The utility model provides a water-filled pressure-maintaining cooling drilling device for taking coal cores, which includes an annular cutter head, and the end of the annular cutter head away from the blade is fastened and connected with one end of a connecting device through a core-taking pipe; The other end of the device is tightly connected to a joint through a connecting pipe; the joint is provided with a mounting hole for connecting the drill pipe; a bearing whose axis coincides with the axis of the mounting hole is arranged away from the joint, and the outer wall of the bearing is connected with a waterproof elastic cloth One end of the cover is tightly connected, and the other end of the waterproof elastic cloth cover is sequentially sleeved with joints, connecting pipes, connecting devices and core tubes and fixed on the outer wall of the core tube through a rubber band; Injection hole, one end of the pressure water injection hole communicates with the connecting pipe, and the other end communicates with the interior of the waterproof elastic cloth cover; a gas extraction pipe is also inserted on the connection device, one end of the gas extraction pipe communicates with the core pipe, and the other end communicates with the inside of the waterproof elastic cloth cover; One end communicates with the connecting pipe.

Description

A device for water-filled and pressure-maintained cooling drilling to take coal cores

technical field

The utility model relates to a water-filled and pressure-maintained cooling drilling device for coal core extraction, which belongs to the technical field of coal mines.

Background technique

Coal seam gas content is one of the most important basic parameters of coal seam, and its measurement methods can be divided into two categories: direct method and indirect method. The direct method for determining the gas content of coal seams can be divided into two types: the drilling cuttings method and the coal core method according to the different coal samples taken. Drilling cuttings sampling method is quicker to measure coal seam gas content, but due to the large pulverization of the original coal sample, resulting in a large amount of gas escape from the coal sample, the accuracy of the measured coal seam gas content value is not ideal. The coal core method directly drills the coal core through a special corer, which is less damaging to the coal sample, which is conducive to ensuring the integrity of the coal core and reducing the escape of coal gas. At present, in the coring process, the corer is usually used to directly drill into the coal wall to sample, but because there is a gas pressure gradient in the coal wall (that is, the gas pressure on the surface of the coal wall is atmospheric pressure, while the gas pressure inside the coal wall is higher than atmospheric pressure), so in During the drilling process using the core extractor, part of the gas from the cored coal core will escape.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a water-filled pressure-maintaining cooling drilling device for coal core extraction that can reduce gas escape and has high accuracy.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a device for drilling and taking coal cores by filling water and maintaining pressure, which is characterized in that it includes a ring-shaped cutter head, and the end of the ring-shaped cutter head away from the blade passes through a The core tube is tightly connected to one end of a connecting device; the other end of the connecting device is tightly connected to a joint through a connecting pipe; the joint is provided with a mounting hole for connecting a drill pipe; There is a bearing whose axis coincides with the axis of the installation hole, the outer wall of the bearing is tightly connected to one end of a waterproof elastic cloth cover, and the other end of the waterproof elastic cloth cover is sequentially sleeved with the joint, connecting pipe, The connection device and the core pipe are fixed on the outer wall of the core pipe through a rubber band; a pressure water injection hole is provided on the connection device, and one end of the pressure water injection hole communicates with the connection pipe. The other end communicates with the interior of the waterproof elastic cloth cover; a gas extraction pipe is also inserted on the connecting device, one end of the extraction gas pipe communicates with the core pipe, and the other end communicates with the connecting pipe connected.

A valve is arranged on the other end of the gas extraction pipe.

The outer wall of the bearing is fastened to the end of the waterproof elastic cloth cover through a compression ring.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. Since the utility model is provided with a pressure water injection hole on the connection device, the joints connected in sequence, the connection pipe, the connection device and the outside of the core tube are commonly covered. Put a waterproof elastic cloth cover, the two ends of the waterproof elastic cloth cover are respectively connected with the bearing and the core pipe, so when the pressure water is injected, the pressure water can flow into the waterproof elastic cloth cover to expand and then seal the drilling hole, Minimize the escape of coal core gas in the process of taking coal core, and improve the accuracy of coal seam gas content measurement. 2. Because the connection between the waterproof elastic cloth cover and the coring pipe is not sealed, the pressure water can flow out along the connection to the ring-shaped cutter head and the coal core of the surrounding coal rock layer, which can not only keep a certain The water pressure seals the coal core gas to prevent the coal core gas from leaking during the coring process, and it can also effectively avoid the desorption of the coal core gas due to the temperature rise during the drilling of the annular cutter head, which effectively improves the accuracy of the coal seam gas content measurement.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

As shown in FIG. 1 , the utility model includes an annular cutter head 1 , the end of the annular cutter head 1 away from the blade is fastened to one end of a connecting device 3 through a core tube 2 . The other end of the connecting device 3 is firmly connected with a joint 5 through a connecting pipe 4 . A mounting hole 51 for connecting the drill pipe 6 is opened on the joint 5 . A bearing 7 whose axis coincides with the axis of the mounting hole 51 is provided away from the joint 5 . The outer wall of the bearing 7 is tightly connected with one end of a waterproof elastic cloth cover 8, and the other end of the waterproof elastic cloth cover 8 is sequentially sleeved with the joint 5, the connecting pipe 4, the connecting device 3 and the core pipe 2, and then fixed by a rubber band 11 On the outer wall of the core tube 2. Wherein, a pressure water injection hole 31 is provided on the connecting device 3 , one end of the pressure water injection hole 31 communicates with the connecting pipe 4 , and the other end communicates with the inside of the waterproof elastic cloth cover 8 . A gas extraction pipe 32 is also inserted on the connection device 3 , one end of the gas extraction pipe 32 communicates with the core pipe 2 , and the other end communicates with the connecting pipe 4 .

In the above embodiments, a valve 9 is provided on the other end of the gas extraction pipe 32 .

In the above embodiment, the outer wall of the bearing 7 can be tightly connected with one end of the waterproof elastic cloth cover 8 through a compression collar 10 .

The using method of the present utility model is as follows:

1) Pass the drill pipe 6 through the bearing 7 and insert it into the mounting hole 51 of the joint 5, and fasten it with the joint 5;

2) Send the drill pipe 6 to the predetermined position for taking the coal core along the drill hole drilled in the coal stratum in advance;

3) The pressure water is delivered to the connecting pipe 4 through the water hole 61 of the drill pipe 6, and then the pressure water flows into the waterproof elastic cloth cover 8 along the pressure water injection hole 31 of the connection device 3, and the waterproof elastic cloth cover 8 is filled with water After expansion, the borehole is blocked, and the rubber band 11 is loosened so that a small amount of pressure water flows out to the annular cutter head 1 and the coal core of the surrounding coal seam along the joint of the waterproof elastic cloth cover 8 and the core pipe 2, not only It can maintain a certain water pressure to seal the coal core gas during coring, prevent the leakage of coal core gas in the process of coring, and can effectively avoid the temperature rise of the annular cutter head 1 during the drilling process to increase the desorption of coal core gas;

4) When the pressure water pressure reaches the set value, start the drill pipe 6 to drive the core pipe 2 and the annular cutter head 1 to rotate and drill the coal core; , the rubber band 11 at the other end is loose, so the waterproof elastic cloth cover 8 will not be driven to rotate when the core tube 2 rotates;

5) When the coal core drilling is finished, the pressure water is turned off, the waterproof elastic cloth cover 8 shrinks gradually, and then the core pipe 2 is taken out by pulling up the drill rod 6;

6) Remove the core tube 2, replace the annular cutter head 1 with a sealing cover, and then connect the gas desorption measuring device to the other end of the gas extraction tube 32, then the coal core gas in the core tube 2 can be measured. content was measured.

In the above step 4), the set value of the water pressure needs to be greater than the gas pressure of the coal formation.

The above-mentioned embodiments are only used to illustrate the utility model, wherein the structure and connection mode of each component can be changed, and any equivalent transformation and improvement carried out on the basis of the technical solution of the utility model should not be excluded. Outside the scope of protection of the present utility model.

Claims (3)

1. A device for water-filled and pressure-maintained cooling drilling to take coal cores, characterized in that: it includes an annular cutter head, and the end of the annular cutter head away from the blade is fastened to an end of a connecting device by a core pipe connection; the other end of the connecting device is fastened to a joint through a connecting pipe; the joint is provided with a mounting hole for connecting the drill pipe; an axis is provided at a place far away from the joint to coincide with the axis of the mounting hole The outer wall of the bearing is tightly connected to one end of a waterproof elastic cloth cover, and the other end of the waterproof elastic cloth cover is sequentially set on the joint, the connecting pipe, the connecting device and the core pipe and passes through a rubber band fixed on the outer wall of the core tube; a pressure water injection hole is provided on the connection device, one end of the pressure water injection hole communicates with the connecting pipe, and the other end communicates with the interior of the waterproof elastic cloth cover A gas extraction pipe is also inserted on the connection device, one end of the gas extraction pipe communicates with the core pipe, and the other end communicates with the connecting pipe. 2. A water-filled and pressure-maintained cooling drilling and coal core extraction device according to claim 1, characterized in that a valve is provided on the other end of the gas pumping pipe. 3. A water-filled and pressure-maintained cooling drilling and coal core extraction device as claimed in claim 1, characterized in that: the outer wall of the bearing is fastened to the end of the waterproof elastic cloth cover through a compression collar connect.