CN110700878A - Pumping screw pump drilling tool system for accumulated water in underground drilling hole of coal mine and construction method thereof - Google Patents

Abstract

A drilling tool system for pumping screw pump with water accumulated in boreholes in underground coal mines and a construction method thereof. One end of the active drill rod is connected with one end of a plurality of double-wall single-action drill rods, a plurality of double-wall single-action drill rods are connected in sequence, and the other end of a plurality of double-wall single-action drill rods is connected with one end of the conversion joint, The other end of the conversion joint is connected with one end of the screw pump, the other end of the screw pump is connected with one end of the filter subsection, and the other end of the filter subsection is connected with one end of the drill bit; It can drain the accumulated water in the directional drilling hole, and can also drain the accumulated water in the conventional downward inclined drilling hole, which has little disturbance to the hole wall, long service life and stable performance of the drilling tool, which can ensure the smooth extraction of gas in the drilling hole.

Description

Water-pumping screw pump drilling tool system and construction method for water accumulation in boreholes in coal mines

technical field

The invention relates to the technical field of drilling tools, in particular to a water-retaining water-pumping screw pump drilling tool system and a construction method thereof in underground boreholes of coal mines.

Background technique

Gas gas is an important disaster risk in the process of coal mining. At present, drilling is generally used for pre-extraction before mining, and the excavation and recovery work can only be carried out after the safety standards are met. Due to the trend of the coal seam, some of the drilling holes in the coal mine are designed as downward inclined drilling holes, or directional drilling with concave trajectories of some hole sections. After the drilling construction is completed, some hole sections will accumulate water, which will seriously affect the effect of drilling gas extraction and production. Therefore, the accumulation of water in the boreholes of coal mines has always been an urgent problem to be solved.

At present, the drainage technology of down-slope drilling in coal mines mostly adopts compressed air drainage technology, which uses underground compressed air as the driving force. The compressed air enters the drilling hole through a high-pressure rubber hose to increase the air pressure in the hole, and conduct momentum with the water and slag mixture in the hole. Exchange with energy to increase the kinetic energy of water and cinder, and determine the pressure and air volume of the compressed air according to the amount of water accumulated in the downhole until the air pressure inside the hole is greater than the atmospheric pressure outside the hole. Water and cinders are pressed into the drain pipe and discharged out of the borehole through the water pipe. This kind of drainage technology needs to run a slender drainage pipe into the hole, which is mostly used for conventional down-sloping drilling. For directional long drilling, it is difficult to lower the drainage pipe to the water accumulation section at the bottom of the hole, and due to the downhole wind pressure and air volume Due to the limitation of deep hole drainage, it is impossible to achieve deep hole drainage. For soft coal seams, the compressed air discharge will also cause disturbance to the hole wall, resulting in the collapse of the hole wall and affecting the gas drainage effect.

Some scholars put forward the principle of using the oil well pump, the screw pump is lowered to the bottom of the hole, and the screw pump is driven by the driving device to pump water. The outer casing is fixed on the inner wall of the steel casing by a special anchoring device, and then the driving device drives the screw pump rotor to realize oil pumping, while the gas drainage drilling holes are mostly completed with open holes, and the drilling holes are prone to "big belly", collapse, and The wall of the coal seam is relatively soft, and it is difficult for the screw pump casing to be fixed on the wall of the borehole through the anchoring device.

For this reason, in view of the above-mentioned defects, the designer of the present invention, through intensive research and design, combined with the experience and achievements of many years of engaging in related industries, has researched and designed a water-pumping screw pump drilling tool system for water accumulation in the boreholes of coal mines and the Its construction method is to overcome the above-mentioned defects.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a water-pumping screw pump drilling tool system and a construction method thereof, which can pump out the accumulated water in the directional borehole, and can also pump out the water in the conventional downwardly inclined borehole. The water has little disturbance to the hole wall, the drilling tool has a long service life and stable performance, which can ensure the smooth extraction of gas in the borehole.

In order to achieve the above purpose, the present invention discloses a drilling tool system of a screw pump for water accumulation in a borehole in a coal mine. The drill bit consists of:

One end of the active drill pipe is connected with one end of a plurality of double-wall single-action drill pipes, the plurality of double-wall single-action drill pipes are connected in sequence, and the other ends of the plurality of double-wall single-action drill pipes are connected with one end of the conversion joint, so The other end of the conversion joint is connected to one end of the screw pump, the other end of the screw pump is connected to one end of the filter subsection, and the other end of the filter subsection is connected to one end of the drill bit.

Wherein: the active drill pipe is composed of a drill pipe body, a first cardan shaft, a drill pipe joint, a first female plug joint, a first sealing sleeve, a drainage joint and a first core pipe. The drill pipe body, The first cardan shaft, the first core tube, the first female connector and the first sealing sleeve are connected in sequence to form a rotatable part, the front end of the drill pipe body is connected to one end of the first cardan shaft, and the first cardan shaft is connected to the first cardan shaft. The other end of the cardan shaft is connected to the rear end of the first core pipe to realize power rotation, the first core pipe, the first female plug joint and the first sealing sleeve are arranged in the drill pipe joint, and the drainage joint It is vertically arranged on the outer wall of the drill pipe joint and passes through it, the outer wall of the first core pipe is provided with a plurality of through first water holes, and the rotatable part of the active drill pipe and the drill pipe joint are provided with The first rolling bearing and the second rolling bearing are used for relative rotation.

Wherein: the front end of the outer bearing ring of the first rolling bearing is against the inner wall boss of the drill pipe joint, the rear end of the inner bearing ring is against the outer wall boss of the first core tube, and the outer bearing ring of the second rolling bearing The end abuts against another inner wall boss of the drill pipe joint, and the two ends of the inner bearing ring respectively abut between the front end wall of the first core tube and an outer wall boss of the first female plug joint to achieve axial limit .

Wherein: the double-wall single-action drill pipe is composed of a first outer tube, a first male connector, a second core tube, a second sealing sleeve, a second female connector and a second sealing ring, and is composed of a first male connector , the second core tube, the second sealing sleeve and the second female connector are connected in turn to form a rotatable part, and a third rolling bearing and a fourth Rolling bearings to achieve the fixation of the first outer tube and the rotation of the rotatable part.

Wherein: the front end of the outer bearing ring of the third rolling bearing is against the inner wall boss of the first outer tube, the rear end of the inner bearing ring is against the outer wall boss of the first male plug joint, and the outer bearing of the fourth rolling bearing The rear end of the ring abuts against another inner wall boss of the first outer tube, and the front end of the inner bearing ring abuts against an outer wall boss of the second female connector to achieve axial limit.

Wherein: the conversion joint is composed of a second outer tube, a second male connector, a third core tube and a third sealing ring, the second outer tube is an external fixing part, and the second male connector and the third core tube A rotatable part is formed through the connection, a fifth bearing is arranged between the second outer tube and the rotatable part, the front end of the core tube is closed and a number of second water passage holes are distributed on the tube wall, and the third core tube The front end is provided with a connecting column.

Wherein: the front end of the outer bearing ring of the fifth bearing abuts against the inner wall boss of the second outer tube, and the rear end of the inner bearing ring abuts against the outer wall boss of the second male plug joint to achieve axial limit.

Wherein: the screw pump consists of a second cardan shaft, a third outer tube, a rubber stator and a rotor, the front end of the second cardan shaft is fixed to the rear end of the rotor, and the rubber stator is fixed to the third outer tube The inner wall of the rotor is arranged in the rubber stator to form a screw pair, and the rotation direction of the rubber stator and the rotor is left-handed.

Wherein: the filter short section is composed of an outer tube with holes, a filter core tube, a support ring and a retaining ring for holes, and the two ends of the filter core tube pass between the supporting ring, the retaining ring for holes and the outer tube with holes respectively. Implement fixed.

Also disclosed is a construction method for a water-pumping screw pump drilling tool system with accumulated water in a borehole in a coal mine, which is characterized by comprising the following steps:

Step 1, connect the running drill bit, filter sub, screw pump, adapter and several double-wall single-action drill pipes in sequence to the known depth of the stagnant hole section;

Step 2, add the active drill pipe, so that the filter sub-section is completely immersed in the water accumulation section in the hole;

Step 3: The drill holder of the drill rig clamps the drill pipe joint of the active drill pipe, the drill rig gyrator hugs the drill pipe body of the active drill pipe, the gyrator rotates counterclockwise, the torque is transmitted to the rotor of the screw pump, and the water is pumped and discharged;

Step 4: When there is no water, remove the active drill pipe, add or withdraw the double-wall single-action drill pipe to the next known depth of the water-filled hole, and repeat step 3;

Step 5: When the drainage of all the water-retaining hole sections is completed, withdraw all the water pumping tools.

From the above content, it can be seen that the water-retaining water-pumping screw pump drilling tool system of the present invention and the construction method thereof have the following effects:

1. By adjusting the number of drilled pipes, the accumulated water in any hole section of directional drilling can be pumped out, and the accumulated water in conventional downward inclined drilling holes can also be pumped out;

2. All internal pipe body threaded connections are made of reverse thread, and the screw pump is also in the form of left helix. When pumping water, the power head rotates counterclockwise, and the screw pump is driven by the inner pipe assembly to pump water, and the screw connection of the outer pipe assembly will become more and more The tighter it is, it will not loosen, and the whole system works stably;

3. The inner tube assembly and the outer tube assembly of the system are connected by specially set and limited rolling bearings, and are sealed by specially set sealing sleeves and sealing rings. The overall structure runs more smoothly, and the torque requirements of the drilling rig power head are low. The drilling tool has good stress conditions, avoids the friction loss of the inner and outer pipes, and can effectively prolong the service life of the system;

4. There is no anchoring device, and there is no scouring of the hole wall by compressed air, and the disturbance to the borehole wall is small.

The details of the present invention can be obtained from the description to be described later and the accompanying drawings.

Description of drawings

Fig. 1 shows a schematic structural diagram of the water-pumping screw pump drilling tool system of the present invention for the water accumulated in the borehole of the coal mine.

Fig. 1A shows a schematic diagram of the connection between the active drill pipe of the present invention and the double-wall single-action drill pipe.

Figure 1B shows a schematic diagram of the interconnection of the double-wall single-action drill pipe of the present invention.

Fig. 1C shows a schematic diagram of the connection between the double-wall single-action drill pipe of the present invention and the conversion joint.

FIG. 1D shows a schematic diagram of the connection between the adapter of the present invention and the progressive cavity pump.

Fig. 2 shows a schematic view of the structure of the active drill pipe of the present invention.

Fig. 3 shows a schematic view of the structure of the double-wall single-action drill pipe of the present invention.

Fig. 4 shows a schematic diagram of the structure of the transition joint of the present invention.

Figure 5 shows a schematic view of the structure of the screw pump of the present invention.

Fig. 6 shows a schematic view of the structure of the filter drill pipe of the present invention.

Reference number:

1. Active drill pipe; 2. Double-wall single-action drill pipe; 3. Conversion joint; 4. Screw pump; 5. Filter sub joint; 6. Drill bit; 101. Drill pipe body; 103. Drill pipe joint; 104. First female connector; 105. First sealing sleeve; 106. First rolling bearing; 107. Drain joint; 108. Second rolling bearing; 109. First core tube; 201. First outer 202. The third rolling bearing; 203. The first male connector; 204. The second core tube; 205. The fourth rolling bearing; 206. The second sealing sleeve; 207. The second female connector; 301. Second outer tube; 302. Fifth rolling bearing; 303. Second male connector; 304. Third core tube; 305. Third sealing ring; 401. Second universal shaft; 402. Third outer tube ; 403. Rubber stator; 404. Rotor; 501. Outer tube with holes; 502. Filter tube; 503 Support ring;

Detailed ways

Referring to FIG. 1 , there is shown a water pumping screw pump drilling tool system of the present invention for water accumulation in a borehole in a coal mine.

The water-pumping screw pump drilling tool system of the underground drilling hole in the coal mine is mainly composed of an active drill pipe 1, a plurality of double-wall single-action drill pipes 2, a conversion joint 3, a screw pump 4, a filter short section 5, and a drill bit 6. 1A, 1B, 1C and 1D at the same time, one end of the active drill rod 1 is connected to one end of a plurality of double-wall single-action drill rods 2, and the number of the plurality of double-wall single-action drill rods 2 can be determined according to the The depth of the required drainage hole section is selected and connected in sequence. The other ends of the multiple double-wall single-action drill pipes 2 are connected with one end of the conversion joint 3, and the other end of the conversion joint 3 is connected with one end of the screw pump 4. The The other end of the screw pump 4 is connected to one end of the filter sub-section 5 , and the other end of the filter sub-section 5 is connected to one end of the drill bit 6 .

Referring to FIG. 2 , the active drill pipe 1 is composed of a drill pipe body 101 , a first cardan shaft 102 , a drill pipe joint 103 , a first female plug joint 104 , a first sealing sleeve 105 , a first rolling bearing 106 , and a drain joint 107 , a second rolling bearing 108 and a first core tube 109, wherein the drill pipe body 101, the first cardan shaft 102, the first core tube 109, the first female connector 104 and the first sealing sleeve 105 are connected in sequence The composed inner pipe assembly is a rotatable part, the outer pipe assembly composed of the drill pipe joint 103 and the drain joint 107 is a non-rotating part, and the front end of the drill pipe body 101 is connected to one end of the first universal shaft 102 , the other end of the first cardan shaft 102 is connected to the rear end of the first core pipe 109, so that after the drill pipe 101 is connected to the drilling rig power head, the power is passed through the first cardan shaft 102 to achieve adjustable direction Rotating, the front end of the first core tube 109 can be fixed to the rear end of the first female plug connector 104 by a screw connection or the like, and the front end of the first female plug connector 104 can be fixed by a screw connection or the like. The rear end of a sealing sleeve 105 , the first core tube 109 , the first female connector 104 and the first sealing sleeve 105 are arranged in the drill pipe joint 103 , and the drain joint 107 is vertically arranged on the back of the drill pipe joint 103 The outer wall of the first core tube 109 is provided with a plurality of through first water holes to discharge the internal liquid through the first water holes and the drainage joint 107. A first rolling bearing 106 and a second rolling bearing 108 are arranged between the rotatable part of the drill pipe and the drill pipe joint to realize rotation. The front end of the outer bearing ring of the first rolling bearing 106 abuts against the inner wall boss of the drill pipe joint 103, The rear end of the inner bearing ring abuts against the outer wall boss of the first core tube 109, the rear end of the outer bearing ring of the second rolling bearing 108 abuts against another inner wall boss of the drill pipe joint 103, and both ends of the inner bearing ring They respectively abut between the front end wall of the first core tube 109 and an outer wall boss of the first female plug connector 104 , thereby realizing axial limit.

Referring to FIG. 3 , the double-wall single-action drill pipe 2 consists of a first outer tube 201, a third rolling bearing 202, a first male plug 203, a second core tube 204, a fourth rolling bearing 205, a second sealing sleeve 206, a The two female plug connectors 207 and the second sealing ring 208 are formed, wherein the rotatable part is composed of the first male plug connector 203, the second core tube 204, the second sealing sleeve 206 and the second female plug connector 207. The joint 203, the second female plug joint 207 and the second core tube 204 can be connected in turn by reverse threads, and a third rolling bearing 202 and a fourth rolling bearing 205 are arranged between the first outer tube 201 and the rotatable part to realize The fixing of the first outer tube 201 and the rotation of the rotatable part, wherein the front end of the outer bearing ring of the third rolling bearing 202 abuts against the inner wall boss of the first outer tube 201, and the rear end of the inner bearing ring abuts against the first outer tube 201. The outer wall boss of the male connector 203, the rear end of the outer bearing ring of the fourth rolling bearing 205 abuts against another inner wall boss of the first outer tube 201, and the front end of the inner bearing ring abuts against the second female connector 205 an outer wall boss, so as to achieve axial limit, and the rear end of the first outer tube 201 fixedly accommodates the front end of the drill pipe joint 103, the first male plug joint 203 and the first female plug joint 104 are inserted and fixed to each other, and the first male connector 203 is accommodated in the first sealing sleeve 105 with a plurality of sealing rings disposed therebetween to realize power transmission and sealing functions.

Referring to FIG. 4 , the adapter 3 is composed of a second outer tube 301 , a fifth rolling bearing 302 , a second male connector 303 , a third core tube 304 and a third sealing ring 305 , and the second outer tube 301 is an external In the fixed part, the second male connector 303 and the third core tube 304 are connected by reverse thread to form a rotatable part, a fifth bearing 302 is arranged between the second outer tube 301 and the rotatable part, and the third core tube 304 The front end of the second outer tube 301 is closed and there are several second water passage holes with a diameter of 6-10mm distributed on the tube wall. The front end of the outer bearing ring of the fifth bearing 305 abuts against the inner wall boss of the second outer tube 301, The rear end of the second outer tube 301 accommodates and fixes the front end of the first outer tube 201, and the second male plug The connector 303 and the second female connector 207 are inserted and fixed to each other, and the second male connector 203 is accommodated in the second sealing sleeve 105 with a plurality of sealing rings between them, so as to realize power transmission and sealing Function.

Wherein, the third rolling bearing 202 , the fourth rolling bearing 205 and the fifth rolling bearing 305 may be a bearing group structure, which may include two ball bearings arranged side by side.

The front end of the third core tube 304 is provided with a connecting column.

Referring to FIG. 5 , the screw pump 4 is composed of a second cardan shaft 401 , a third outer tube 402 , a rubber stator 403 and a rotor 404 . The rear end of the third outer tube 402 accommodates and fixes the second outer tube 301 The front end of the second cardan shaft 401 is provided with a connecting cylinder, which can be screwed or fixed to the connecting column by a form fit, and the front end of the second cardan shaft 401 is fixed to the rear of the rotor 404 end, the rubber stator 403 is fixed to the inner wall of the third outer tube 402, the rotor 404 is arranged in the rubber stator 403 to form a screw pair, the number of the rubber stator 403 and the rotor 404 can be single or can be For multiple heads, the rotation direction of the rubber stator 403 and the rotor 404 is preferably left-handed, and the rear end of the third outer tube 402 accommodates and fixes the front end of the second outer tube 301 .

Referring to FIG. 6 , the filter short section 5 is composed of a perforated outer tube 501 , a filter core tube 502 , a support ring 503 and a hole retaining ring 504 , and the two ends of the filter core tube 502 pass through the support rings 503 and 2 , respectively. Each hole is fixed between the retaining ring 504 and the outer tube 501 with holes, and the diameter of the filter hole of the filter core tube needs to be determined according to the solid particle size allowed by the screw pump.

To sum up, the pumping screw pump drilling tool system of the present invention is divided into two parts: the system outer pipe assembly and the system inner pipe assembly. The system outer pipe assembly consists of the drill pipe joint of the active drill pipe 1, the double-wall single-action The first outer pipe of the drill pipe 2, the second outer pipe of the adapter 3, the third outer pipe of the screw pump 4, the filter sub-section 5 and the drill bit 6 are sequentially connected by the positive wire thread, and the inner pipe assembly of the system is composed of an active drill. The rod 1, the inner pipe assembly of the double-wall single-action drill rod 2, the rotatable part of the adapter 3 and the second universal shaft and the rotor in the screw pump 4 are connected in turn by plugging or reverse threading. The structure is provided with two sealing rings for sealing, the two major parts of the system outer tube assembly and the system inner tube assembly can rotate relative to each other, and several groups of rolling bearings are installed between them.

Moreover, the inventors of the present invention specially set up sealing components between the connection structures, and through the special arrangement and position limit of each bearing between relative rotations, the mutual rotation and sealing are more optimized, and better effects are achieved.

As a result, the water pumping screw pump drilling tool system of the above-mentioned structure in the underground borehole of the coal mine can realize the pumping and drainage of the accumulated water in the borehole of the coal mine. The specific construction method mainly includes the following steps:

Step 1, connect the drill bit 6, the filter short section 5, the screw pump 4, the conversion joint 3 and several double-wall single-action drill pipes 2 in turn to the known depth of the stagnant hole section;

Step 2, add the active drill pipe 1, so that the filter short section 5 is completely immersed in the water accumulation section in the hole;

Step 3: The drill holder clamps the drill pipe joint 103 of the active drill pipe 1 to fix the outer pipe assembly of the system, that is, the screw pump stator is fixed. Then, the drill rotator holds the drill pipe body 101 of the active drill pipe 1 tightly. , the gyrator rotates counterclockwise, the torque is transmitted to the rotor of the screw pump 3 through the inner pipe assembly of the system, and the screw motor is driven to pump water. The annular space between the third core pipe 304 and the second outer pipe 301 then enters the second core pipe 204 of the double-wall single-action drill pipe 2 through the second water passage on the pipe wall of the third core pipe 304, and flows After passing through the first core pipe 109 of the active drill pipe 1, it flows into the annulus between the first core pipe 109 and the drill pipe joint 103 from the first water passage of the first core pipe 109, and is finally discharged from the drainage joint 107;

Step 4: When there is no water coming out of the drain joint 107, it indicates that the water in this hole section has been drained, remove the active drill pipe 1, add or withdraw several double-wall single-action drill pipes 2 to the next known water-retaining hole section depth, repeat step 3;

Step 5: When the drainage of all the water-retaining hole sections is completed, withdraw all the water pumping tools.

It can be seen that the advantages of the present invention are:

1. By adjusting the number of drilled pipes, the accumulated water in any hole section of directional drilling can be pumped out, and the accumulated water in conventional downward inclined drilling holes can also be pumped out;

2. All internal pipe body threaded connections are made of reverse thread, and the screw pump is also in the form of left helix. When pumping water, the power head rotates counterclockwise, and the screw pump is driven by the inner pipe assembly to pump water, and the screw connection of the outer pipe assembly will become more and more The tighter it is, it will not loosen, and the whole system works stably;

3. The inner tube assembly and the outer tube assembly of the system are connected by specially set and limited rolling bearings, and are sealed by specially set sealing sleeves and sealing rings. The overall structure runs more smoothly, and the torque requirements of the drilling rig power head are low. The drilling tool has good stress conditions, avoids the friction loss of the inner and outer pipes, and can effectively prolong the service life of the system;

4. There is no anchoring device, and there is no scouring of the hole wall by compressed air, and the disturbance to the borehole wall is small.

It will be apparent that the above descriptions and records are merely examples and are not intended to limit the disclosure, application, or uses of the present invention. While the embodiments have been described and described in the accompanying drawings, this invention is not limited to the specific examples illustrated by the drawings and described in the embodiments as the best mode presently believed to be for carrying out the teachings of this invention. , the scope of the invention shall include any embodiments falling within the preceding description and appended claims.

Claims (10)

1. A water-pumping screw pump drilling tool system for water accumulation in a borehole in a coal mine, consisting of an active drill pipe, a plurality of double-walled single-action drill pipes, an adapter, a screw pump, a filter pup, and a drill bit, and is characterized in that: One end of the active drill pipe is connected with one end of a plurality of double-wall single-action drill pipes, the plurality of double-wall single-action drill pipes are connected in sequence, and the other ends of the plurality of double-wall single-action drill pipes are connected with one end of the conversion joint, so The other end of the conversion joint is connected to one end of the screw pump, the other end of the screw pump is connected to one end of the filter subsection, and the other end of the filter subsection is connected to one end of the drill bit. 2 . The water-pumping screw pump drilling tool system of claim 1 , wherein the active drill pipe is composed of a drill pipe body, a first cardan shaft, a drill pipe joint, a second A female connector, a first sealing sleeve, a drainage connector and a first core tube are formed by connecting the drill pipe body, the first cardan shaft, the first core tube, the first female connector and the first sealing sleeve in sequence. The rotatable part, the front end of the drill pipe body is connected to one end of the first cardan shaft, the other end of the first cardan shaft is connected to the rear end of the first core pipe to realize the rotation of the power, the first cardan shaft A core pipe, a first female plug joint and a first sealing sleeve are arranged in the drill pipe joint, and the drainage joint is vertically arranged on the outer wall of the drill pipe joint and penetrates through it. The outer wall of the first core pipe is provided with a plurality of There are through first water passage holes, and a first rolling bearing and a second rolling bearing are arranged between the rotatable part of the active drill pipe and the drill pipe joint to realize relative rotation. 3 . The water-retaining water-pumping screw pump drilling tool system of the underground borehole in a coal mine as claimed in claim 2 , wherein the front end of the outer bearing ring of the first rolling bearing abuts against the inner wall boss of the drill pipe joint, and the inner The rear end of the bearing ring abuts against the outer wall boss of the first core tube, the rear end of the outer bearing ring of the second rolling bearing abuts against another inner wall boss of the drill pipe joint, and the two ends of the inner bearing ring respectively abut against the The axial limit is realized between the front end wall of the first core tube and an outer wall boss of the first female connector. 4 . The water-pumping screw pump drilling tool system of claim 1 , wherein the double-wall single-action drill pipe consists of a first outer pipe, a first male plug joint, a second The core tube, the second sealing sleeve, the second female plug connector and the second sealing ring are composed of the first male plug connector, the second core tube, the second sealing sleeve and the second female plug connector connected in sequence to form a rotatable part. A third rolling bearing and a fourth rolling bearing are arranged between an outer tube and the rotatable part of the double-walled single-action drill pipe to realize the fixation of the first outer tube and the rotation of the rotatable part. 5 . The water-retaining water-pumping screw pump drilling tool system of the underground borehole in a coal mine as claimed in claim 4 , wherein the front end of the outer bearing ring of the third rolling bearing abuts against the inner wall boss of the first outer tube, 6 . The rear end of the inner bearing ring abuts against the outer wall boss of the first male plug joint, the rear end of the outer bearing ring of the fourth rolling bearing abuts against another inner wall boss of the first outer tube, and the front end of the inner bearing ring abuts on an outer wall boss of the second female connector to achieve axial limit. 6 . The water-pumping screw pump drilling tool system of claim 1 , wherein the adapter is composed of a second outer pipe, a second male plug, a third core pipe, and a second outer pipe. 7 . It consists of three sealing rings, the second outer tube is an external fixed part, the second male plug is connected with the third core tube to form a rotatable part, and a fifth bearing is arranged between the second outer tube and the rotatable part, so The front end of the core tube is closed, a plurality of second water passage holes are distributed on the tube wall, and the front end of the third core tube is provided with a connecting column. 7 . The water-retaining screw pump drilling tool system of claim 6 , wherein the front end of the outer bearing ring of the fifth bearing abuts against the inner wall boss of the second outer pipe, 8 . The rear end of the inner bearing ring abuts against the outer wall boss of the second male plug joint to realize axial limit. 8. The drilling tool system for water-retaining water-pumping screw pumps in underground boreholes in coal mines according to claim 1, wherein the screw pump is composed of a second universal shaft, a third outer pipe, a rubber stator and a rotor, The front end of the second cardan shaft is fixed to the rear end of the rotor, the rubber stator is fixed to the inner wall of the third outer tube, the rotor is arranged in the rubber stator to form a screw pair, and the rubber stator and the rotor rotate. To the left. 9. The drilling tool system for water accumulation in the underground borehole of a coal mine as claimed in claim 1, wherein the filter short section is composed of a perforated outer tube, a filter core tube, a support ring and a retaining ring for the hole The two ends of the filter core tube are respectively fixed between the support ring, the retaining ring for holes and the outer tube with holes. 10. The construction method of the water accumulated water pumping screw pump drilling tool system in the underground borehole of a coal mine as described in any one of claims 1-10, is characterized in that comprising the following steps: Step 1, connect the running drill bit, filter sub, screw pump, adapter and several double-wall single-action drill pipes in sequence to the known depth of the stagnant hole section; Step 2, add the active drill pipe, so that the filter sub-section is completely immersed in the water accumulation section in the hole; Step 3: The drill holder of the drill rig clamps the drill pipe joint of the active drill pipe, the drill rig gyrator hugs the drill pipe body of the active drill pipe, the gyrator rotates counterclockwise, the torque is transmitted to the rotor of the screw pump, and the water is pumped and discharged; Step 4: When there is no water, remove the active drill pipe, add or withdraw the double-wall single-action drill pipe to the next known depth of the water-filled hole, and repeat step 3; Step 5: When the drainage of all the water-retaining hole sections is completed, withdraw all the water pumping tools.

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