CN111980603A - Coal seam long-drill-hole drilling water-feeding sediment coal slag discharging system and sediment discharging method - Google Patents

Abstract

The invention discloses a coal seam long borehole drilling system and a slag discharge method for depositing coal slag. One port of the drill pipe is communicated with the outlet of the water pump through the pipeline, and the other end of the drill pipe extends into the borehole; the tail port of the drill bit is communicated with the other port of the drill pipe, and the center hole of the head end of the drill bit is communicated with the inside of the borehole; the swirling flow The device is fixed at the rear end of the drill bit; a high-density aqueous solution is arranged in the box, the high-density aqueous solution is an inorganic salt solution, and the density of the high-density aqueous solution is greater than that of cinder. The invention adopts the high-density aqueous solution to increase the buoyancy of the coal slag and greatly reduces the flow resistance of the coal slag; at the same time, a swirl device is installed at the tail of the drill bit, and the swirl device rotates simultaneously when the drill bit rotates, which can increase the power of the high-density aqueous solution to flow. The high-density aqueous solution is more likely to flow to the outlet of the borehole, and it is easy to discharge the coal slag, which is conducive to the drilling of the borehole.

Description

A system and method for discharging deposited coal slag by drilling a long borehole in a coal seam

technical field

The invention relates to the technical field of coal mine safety engineering, in particular to a system and a slag discharge method for depositing coal slag by drilling a long borehole in a coal seam.

Background technique

There are more than 2,000 high-gas mines in my country. Among the gas control methods, drilling holes in the coal seam to extract gas is one of the most important means. With the development of drilling construction equipment and technology, the construction of long-distance drilling in coal seams, such as the application of "kilometer drilling rig" drilling technology, is more and more widely used. At present, the depth of mature kilometers-long drilling holes is more than 800m. However, the trajectory of long-distance drilling in the coal seam is not a ray or a straight line. Affected by the hardness of the coal and rock mass and the self-weight of the drilling tool, the trajectory of the drilling is a "wavy" continuous undulating trajectory with different slopes, usually in the low-lying "valley". At the same time, a large amount of coal slag is deposited and cannot be discharged from the borehole, which leads to the problem that the drilling cannot be continued.

At present, the commonly used hydrodynamic slag discharge is to apply a pump pressure of more than 30MPa at the orifice. The dynamic pressure water is conducted to the bottom of the hole through the tubular channel in the drill pipe, and the slag is discharged through the channel between the hole wall and the surface of the drill pipe. outside the hole. Chinese patent CN206707754U discloses a water injection slag discharge device for coal mine drilling, which introduces the theory of high-pressure water jet, so that the hydraulic punching pump station, pressure control device, automatic conversion drill bit, etc. are organically combined with the drilling rig to realize drilling and punching. The coal hole is integrated, but the energy loss in this process is huge, and the dynamic pressure water often passes through the undulating inner wall of the drill pipe, and when it reaches the bottom of the hole, it has been reduced to 3MPa. Lost expensive directional drill bits in coal holes.

At present, in the aspect of drilling water slag discharge, the shape design of drill bits, drill pipes and other drilling tools is basically changed, which improves the slag discharge efficiency to a certain extent, but does not fundamentally solve the problem of slag discharge. Physical properties of slag discharge liquid, Chinese patent CN106285524A discloses a system, method and polymer mud for slag discharge of polymer mud in downward drilling of coal mines. The method mainly involves pouring polymer mud into the borehole. The slag is infiltrated and viscous and adsorbed to achieve the purpose of slag discharge down the hole, but the mud will block the surface characteristics of the porous medium of the coal body, which is not conducive to the desorption and extraction of the coal body in the later stage, and the slag discharge process is complicated and not suitable for " Long-distance drilling drilled by the "Kilometer Rig".

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is how to solve the problem that the coal slag in the long-distance borehole in the coal seam is not easy to be discharged, which leads to the difficulty of drilling.

The present invention realizes and solves the above-mentioned technical problems through the following technical means:

A coal seam long borehole drilling water and depositing coal slag system, comprising a box body, a water pump, a drill pipe, a drill bit and a swirl device; the inlet of the water pump is communicated with the outlet of the box body through a pipeline; the drill pipe One port of the drill pipe is communicated with the outlet of the water pump through a pipeline, and the other end of the drill pipe extends into the borehole; the tail port of the drill bit is communicated with the other port of the drill pipe, and the center hole of the head end of the drill bit communicated with the inside of the borehole; the swirl device is fixed on the rear end of the drill bit, and the drill bit rotates and drives the swirl device to rotate;

A high-density aqueous solution is arranged in the box, the high-density aqueous solution is an inorganic salt solution, and the density of the high-density aqueous solution is greater than that of cinder.

The invention adopts high-density aqueous solution to increase the buoyancy of the cinder, so that it loses the friction force in contact with the wall surface of the borehole, and greatly reduces the flow resistance of the cinder, so that it is easy to drive the cinder to flow to the outlet of the borehole and discharge; A swirl device is installed, and the swirl device rotates at the same time when the drill bit rotates, which can increase the flow power for the high-density aqueous solution in the borehole. get in.

Preferably, the swirling device includes a main shaft; the main shaft is sleeved on the rear end of the drill bit.

Preferably, the swirling device further includes a stirring member, and the stirring member is fixed on the main shaft.

Preferably, the stirring member is an impeller.

Preferably, the stirring member is a helical impeller structure.

Preferably, it also includes a first infusion pipe, one port of the first infusion pipe is communicated with the outlet of the box body, and the other end of the first infusion pipe is communicated with the inlet of the water pump.

Preferably, it also includes a second infusion pipe, one port of the second infusion pipe is communicated with the outlet of the water pump, and the other end of the second infusion pipe is communicated with the inlet of the drill pipe.

The present invention also provides a slag discharge method for the above-mentioned long borehole drilling in the coal seam to discharge the deposited coal slag system.

A slag discharge method for a coal seam long borehole drilled into water and a sedimentary coal slag system, comprising the following steps:

S1. First, pour the high-density aqueous solution into the box;

S2. Start the drill bit, and the drill bit drills into the coal seam to form a hole;

S3. Start the water pump at the same time, the water pump extracts the high-density aqueous solution in the box, and the high-density aqueous solution enters the drill pipe through the pipeline, and then is transported to the drill bit through the channel in the center of the drill pipe, and finally discharged from the center hole of the drill bit to the drill pipe. inside the hole;

S4. When the drill bit rotates, it drives the swirl device to rotate. Due to the dynamic action of the swirl device, the power of the high-density aqueous solution is increased, and the high-density aqueous solution drives the cinder to flow and discharge to the outlet of the borehole.

Further, the inorganic salt solution is a saturated aqueous solution of Na ₂ SO ₄ .

Further, the density of the inorganic salt solution is greater than 1.3 g/cm ³ .

Working principle: put Na ₂ SO ₄ in the box, stir and melt, as drilling medium, increase the proportion of drilling slag discharge water, make it a high-density aqueous solution to improve the buoyancy of cinder, reduce the frictional resistance between cinder and coal seam wall, Conducive to the discharge of cinder; the high-density aqueous solution reaches the bottom of the borehole through the inner wall of the drill pipe, forming turbulent flow between the surface of the drill pipe and the wall of the borehole, and the cinder is affected by the lifting buoyancy and no longer deposited in the "valley bottom" of the undulating borehole trajectory , the adhesion with the coal seam wall is also greatly reduced; at the same time, a swirl device is installed at the end of the bottom drill bit. Due to the dynamic action of the swirl device, the power of the high-density aqueous solution is increased, and the cinder discharge is accelerated. The probability of stuck drilling and buried drilling is greatly improved, the hole forming effect and the extraction effect are greatly improved, and the drilling efficiency is effectively improved.

The advantages of the present invention are:

1. The present invention uses a high-density aqueous solution to increase the buoyancy of the cinder, thereby making it lose the frictional force in contact with the wall of the borehole, greatly reducing the flow resistance of the cinder, thereby easily driving the cinder to flow to the outlet of the borehole and discharge; The swirl device is installed at the tail of the drill, and the swirl device rotates at the same time when the drill bit rotates, which can increase the flow power for the high-density aqueous solution in the borehole. Drill the hole.

2. The present invention has the common advantages of coal slag lifting and power discharge. Compared with the traditional mud slag discharge and hydrodynamic slag discharge, the hole bottom swirl device is added, which increases the power of the hole bottom slag discharge. The method is different. The use of high-density aqueous solution to increase the buoyancy of coal slag will not seal the surface characteristics of the porous medium of coal body, which is beneficial to gas desorption and drainage in the later stage.

3. The present invention does not change the construction process of the kilometer drilling rig. It only needs to feed materials in the box in advance, and install a swirl device at the tail of the directional drill bit of the kilometer drilling rig. The operation is simple and convenient, and the slag discharge effect is improved by 70%. The single-machine efficiency of hole construction has been increased by 25%, and the drilling efficiency, hole-forming effect and extraction effect have been greatly improved.

Description of drawings

Fig. 1 is a kind of structural schematic diagram of a coal seam long borehole drilling system of the present invention for draining and depositing coal slag;

FIG. 2 is an enlarged schematic structural diagram of A of the embodiment of the present invention.

Description of reference numbers:

1. Box body; 2. Water pump; 3. Drill pipe; 4. Drill bit; 5. Swirl device; 51. Main shaft; 52. Stirring part; 6. First infusion pipe; 7. Second infusion pipe; 101. Height Density aqueous solution; 102, coal seam; 103, drilling hole; 104, cinder.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention. examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 1 , the present embodiment discloses a coal seam long borehole drilling water drainage system for depositing cinder, including a box body 1 , a water pump 2 , a drill pipe 3 , a drill bit 4 , a swirl device 5 , and a first liquid infusion pipe 6 and the second infusion pipe 7; as shown in Figure 1, the high-density aqueous solution is labeled 101, the coal seam is labeled 102, the drill hole is labeled 103, and the cinder is labeled 104.

As shown in FIG. 1 , the box body 1 of this embodiment is an existing water tank structure, and the box body 1 does not have a top sealing structure. The top of the box body 1 is equipped with a matching box cover, and the box cover is also provided with a feeding port. and a water outlet; the high-density aqueous solution 101 is added to the inside of the box body 1 of this embodiment through the feeding port.

As shown in FIG. 1 , the water inlet of the water pump 2 is communicated with the water outlet of the box body 1 through the first infusion pipe 6 , the water inlet end of the first infusion pipe 6 extends into the inside of the box body 1 , and the inlet of the first infusion pipe 6 The water end is always located below the water surface of the high-density aqueous solution 101, and the pipe wall of the water outlet end of the first infusion pipe 6 is welded and fixed to the outer wall of the water inlet of the water pump 2, or an existing flange plate and a bolt or screw connection can be used. The water outlet of the water pump 2 is communicated with the inlet of the drill pipe 3 through the second infusion pipe 7.

As shown in Figure 1, the pipe wall of the water inlet end of the second infusion pipe 7 is welded and fixed to the outer wall of the water outlet of the water pump 2, or the existing flange plate can also be fixedly connected with bolts or screws; The pipe wall of the water outlet end of the second infusion pipe 7 is welded and fixed to the outer wall of the inlet of the drill pipe 3, and the existing flange plate can also be fixedly connected with bolts or screws.

As shown in FIG. 1 , the tail port of the drill bit 4 is communicated with the outlet of the drill rod 3, and the outer wall of the tail port of the drill bit 4 is welded and fixed to the outer wall of the outlet of the drill rod 3. It can also be integrally formed, or the existing The flange of the drill bit 4 is fixedly connected by means of bolts or screws;

As shown in Figures 1 and 2, the swirl device 5 includes a main shaft 51 and a stirring member 52. The main shaft 51 is sleeved on the outer wall of the rear end of the drill bit 4, and the inner wall of the main shaft 51 can be welded and fixed with the outer wall of the rear end of the drill bit 4, or Existing bolts or screws can be used to be installed on the outer wall of the rear end of the drill bit 4;

A method for forming a long borehole in a coal seam and a system for water drainage and deposition of coal slag, comprising the following steps:

S1. First, pour the high-density aqueous solution 101 into the box body 1;

S2, start the drill bit 4, and the drill bit 4 drills into the coal seam 102 to form a hole 103;

S3, start the water pump 2 at the same time, the water pump 2 extracts the high-density aqueous solution 101 in the box 1, and the high-density aqueous solution 101 enters the drill pipe 3 through the pipeline, and then is transported to the drill bit 4 through the channel in the center of the drill pipe 3, and finally Discharge from the central hole of the drill bit 4 into the drilled hole 103;

S4. When the drill bit 4 rotates, it drives the swirl device 5 to rotate. Due to the dynamic action of the swirl device 5, the power of the high-density aqueous solution 101 is increased, and the high-density aqueous solution 101 drives the cinder 104 to flow and discharge to the outlet of the borehole 103.

The inorganic salt solution in this embodiment is a saturated aqueous solution of Na ₂ SO ₄ .

The density of the inorganic salt solution of this embodiment is greater than 1.3 g/cm ³ .

Working principle: put Na ₂ SO ₄ in the box 1, stir and melt, as the drilling medium, increase the proportion of the slag discharge water in the borehole 103, make it a high-density aqueous solution 101, improve the buoyancy of the cinder 104, reduce the amount of The wall friction resistance of the coal seam 102 is conducive to the discharge of the cinder 104; the high-density aqueous solution 101 reaches the bottom of the borehole 103 through the inner wall of the drill pipe 3, and forms turbulent flow between the surface of the drill pipe 3 and the wall of the borehole 103, and the cinder 104 is lifted by buoyancy At the same time, the swirl device 5 is installed at the end of the bottom hole drill bit 4. Due to the dynamic action of the swirl device 5, the increase in The power of the high-density aqueous solution 101 accelerates the discharge of the cinder 104, which is conducive to the drilling of the borehole 103, reduces the probability of "stuck drilling and buried drilling", greatly improves the hole-forming effect and drainage effect, and effectively improves the drilling efficiency.

Compared with the prior art, the present invention has the following advantages: First, the present invention adopts the high-density aqueous solution 101 to increase the buoyancy of the cinder 104, so that it loses the frictional force in contact with the wall surface of the borehole 103, and greatly reduces the flow resistance of the cinder 104 , so as to easily drive the cinder 104 to the outlet of the borehole 103 and discharge; at the same time, a swirl device 5 is installed at the tail of the drill bit 4, and the swirl device 5 rotates at the same time when the drill bit 4 rotates, which can be the high-density aqueous solution in the borehole 103. 101 increases the power of flow, and the high-density aqueous solution 101 is more likely to flow to the outlet of the borehole 103 , so that the cinder 104 is easily discharged, which is beneficial to the drilling of the borehole 103 . Second, the present invention has the common advantages of 104 liters of coal slag floating and power discharge. Compared with the traditional mud slag discharge and hydrodynamic slag discharge, the hole bottom swirl device 5 is added, which increases the power of the hole bottom slag discharge, which is compatible with the mud slag discharge. The method of adsorbing the cinder 104 is different. The high-density aqueous solution 101 is used to increase the buoyancy of the cinder 104, which will not close the surface characteristics of the porous medium of the coal body, which is beneficial to the gas desorption and extraction in the later stage. Third, the present invention does not change the construction process of the kilometer drilling rig. It only needs to feed the material in the box 1 in advance, and install the swirl device 5 at the tail of the directional drill bit 4 of the kilometer drilling rig. The operation is simple and convenient, and the slag discharge effect is improved by 70%. , the single-machine efficiency of the 1000-meter drilling 1 construction has been increased by 25%, and the drilling efficiency, hole-forming effect, and drainage effect have been greatly improved.

Embodiment 2

The difference between this embodiment and the above-mentioned embodiment is that, as shown in FIG. 2 , the stirring member 52 of this embodiment adopts the existing impeller structure, and is a spiral impeller structure.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a coal seam long borehole is drilled into the water and deposited cinder system, it is characterized in that: comprise box body, water pump, drill pipe, drill bit and swirl device; The inlet of described water pump passes through pipeline and the outlet of described box body One port of the drill pipe is communicated with the outlet of the water pump through a pipeline, and the other end of the drill pipe extends into the borehole; the tail port of the drill bit is communicated with the other port of the drill pipe, so The central hole at the head end of the drill bit communicates with the inside of the drilled hole; the swirl device is fixed on the rear end of the drill bit, and the drill bit rotates and drives the swirl device to rotate; A high-density aqueous solution is arranged in the box, the high-density aqueous solution is an inorganic salt solution, and the density of the high-density aqueous solution is greater than that of cinder. 2 . The system according to claim 1 , wherein the swirl device comprises a main shaft; the main shaft is sleeved on the tail end of the drill bit. 3 . 3 . The system according to claim 2 , wherein the swirling device further comprises a stirring member, and the stirring member is fixed on the main shaft. 4 . 4 . The system according to claim 3 , characterized in that the stirring member is an impeller. 5 . 5 . The system according to claim 4 , wherein the agitating member is a helical impeller structure. 6 . 6 . The system according to claim 1 , characterized in that it further comprises a first infusion pipe, and a port of the first infusion pipe is communicated with the outlet of the box body. 7 . , the other end of the first infusion pipe is communicated with the inlet of the water pump. 7 . The system according to claim 1 , characterized in that it further comprises a second infusion pipe, and a port of the second infusion pipe is communicated with the outlet of the water pump, The other end of the second infusion pipe is communicated with the inlet of the drill pipe. 8. A slag discharge method based on the long borehole drilling in a coal seam according to claim 1, which is characterized in that it comprises the following steps: S1. First, pour the high-density aqueous solution into the box; S2. Start the drill bit, and the drill bit drills into the coal seam to form a hole; S3. Start the water pump at the same time, the water pump extracts the high-density aqueous solution in the box, and the high-density aqueous solution enters the drill pipe through the pipeline, and then is transported to the drill bit through the channel in the center of the drill pipe, and finally discharged from the center hole of the drill bit to the drill pipe. inside the hole; S4. When the drill bit rotates, it drives the swirl device to rotate. Due to the dynamic action of the swirl device, the power of the high-density aqueous solution is increased, and the high-density aqueous solution drives the cinder to flow and discharge to the outlet of the borehole. 9 . The method for slag discharge of a coal seam long borehole drilled into water and deposited cinder system according to claim 8 , wherein the inorganic salt solution is a saturated aqueous solution of Na ₂ SO ₄ . 10 . 10 . The method for slag discharge of a coal seam long borehole drilling water and sedimentary slag system according to claim 9 , wherein the density of the inorganic salt solution is greater than 1.3 g/cm ³ . 11 .

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