Novel cross-layer drilling pressure relief blowout prevention spiral drilling tool

Abstract

The invention discloses a novel cross-layer drilling pressure relief blowout prevention spiral drilling tool which comprises a plurality of sieve hole spiral drilling rods which are connected with one another, an opening and closing type drilling and punching drill bit arranged at the front end of the sieve hole spiral drilling rod at the foremost end and a flow supply slag discharging device arranged at the rear end of the sieve hole spiral drilling rod at the rearmost end. One part of drilling slag outside the drilling tool is discharged outwards through the spiral conveying effect of blades on the outer surface of the pressure-relief blowout-prevention drilling tool, and the other part of drilling slag enters a first pressure-relief slag discharging channel and a second pressure-relief slag discharging channel of the pressure-relief blowout-prevention spiral drilling tool through a first air leakage slag inlet screen hole and a second air leakage slag inlet screen hole. And the entered drilling slag is discharged outwards along the first pressure relief and slag discharge channel, the second pressure relief and slag discharge channel and the third pressure relief and slag discharge channel under the combined action of fluid and gravity. The device is simple in structure and convenient to operate, high-pressure gas can be prevented from being accumulated in a drill hole, the pressure relief and blowout prevention functions are achieved, the deslagging efficiency of the drill hole can be greatly improved, and the rotation resistance of the drill rod is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of underground drilling construction equipment, and in particular relates to a novel through-layer drilling pressure relief and blowout prevention spiral drilling tool. Background Art

[0002] Pre-extraction of coal seam gas through drilling is an effective technical measure to prevent and control coal and gas outbursts. However, when drilling in outburst coal seams, due to the influence of ground stress, gas pressure, drilling tool disturbance, etc., the drilling is prone to abnormal dynamic phenomena such as hole collapse, hole blockage, hole spraying, and drill sticking, which not only affects the drilling depth of the borehole, but also causes the gas spraying hole to exceed the limit, causing major safety hazards to on-site construction.

[0003] At present, coal mines mainly adopt measures to prevent blowouts by installing blowout prevention devices outside the borehole. These measures are passive technical measures after the borehole blowout occurs, and cannot actively prevent blowouts inside the borehole, especially cannot solve the blowouts induced by borehole blockage. If the borehole is blocked during the drilling process, the gas deep in the borehole will gradually accumulate, and then form a "gas bag" with a certain pressure and volume; when the blocked section of the borehole is suddenly unblocked, the accumulated high-pressure gas will suddenly spray out, causing the orifice and tunnel gas to exceed the limit. Therefore, there is a need for a new type of through-layer drilling pressure relief and blowout prevention spiral drill with pressure relief and blowout prevention function, low drilling resistance, and the ability to meet the needs of safe and efficient drilling of soft and protruding coal seams. Summary of the invention

[0004] The purpose of the present invention is to provide a new type of through-layer drilling pressure relief and blowout prevention spiral drill with pressure relief and blowout prevention function, low drilling resistance and meeting the needs of safe and efficient drilling in soft and protruding coal seams. When the drill tool of the present application is drilling an upward hole in a coal (rock) layer, a part of the drill cuttings outside the drill tool is discharged outwardly through the spiral conveying action of the blades on the outer surface of the pressure relief and blowout prevention drill tool, and the other part will enter the first pressure relief and slag discharge channel and the second pressure relief and slag discharge channel of the pressure relief and blowout prevention spiral drill tool through the first air relief and slag inlet sieve hole and the second air relief and slag inlet sieve hole. The drill cuttings that enter are discharged outwardly along the first pressure relief and slag discharge channel, the second pressure relief and slag discharge channel and the third pressure relief and slag discharge channel under the action of fluid and gravity. The rotation of the drill tool will reduce the resistance between the drill cuttings and the wall of the pressure relief and slag discharge channel, accelerate the sliding speed, and thus improve the drilling efficiency and slag discharge efficiency. In addition, the gas deep in the borehole of the present invention can enter the pressure relief and slag discharge channel through the second air relief and slag inlet sieve hole of the open and close drilling and punching drill bit and the first air relief and slag inlet sieve hole of the sieve hole spiral drill rod, and then connect with the outside of the borehole, avoiding gas accumulation inside the borehole, and effectively solving the technical problems of abnormal gas gushing in the hole causing spray holes and spray holes caused by blockage due to borehole collapse.

[0005] To achieve the above object, the present invention adopts the following technical solution: A novel through-layer drilling pressure relief and blowout prevention spiral drilling tool comprises a plurality of mutually connected sieve hole spiral drill rods, an open-and-closed drilling and punching drill bit arranged at the front end of the frontmost sieve hole spiral drill rod, and a slag supply and discharge device arranged at the rear end of the rearmost sieve hole spiral drill rod, the sieve hole spiral drill rod comprises a drill rod body, the interior of the drill rod body is arranged with a first pressure relief and slag discharge channel which is through-through and circular in cross section, the front end of the drill rod body is arranged with a first threaded joint, the first threaded joint comprises a first threaded section and a first extension section, the outer diameter of the first threaded section is smaller than the outer diameter of the drill rod body, the outer diameter of the first extension section is smaller than the outer diameter of the first threaded section, the outside of the first threaded section is arranged with a plurality of first arc grooves arranged along the front-to-back direction, the outer surface of the first threaded section is arranged with a first male thread, the outer surface of the drill rod body is arranged with a first spiral blade extending from the rear end of the drill rod body to the front end of the drill rod body, and the rear end of the drill rod body is arranged with a first female thread; The open-and-close drill punch bit comprises a drill shank, the interior of the drill shank is provided with a second pressure relief and slag discharge channel which is through front and back and has a circular cross section, the second pressure relief and slag discharge channel is connected with the first pressure relief and slag discharge channel, the front end of the drill shank is evenly provided with a plurality of cutting edges along the circumferential direction, the rear end of the drill shank is provided with a second female thread corresponding to the first male thread, the open-and-close drill punch bit is installed on the front end of the frontmost sieve hole spiral drill rod through the thread matching of the first male thread and the second female thread, the outer surface of the drill shank is provided with a second spiral blade, and a rotating stopper is provided at the front end center of the drill shank; The flow supply and slag discharger includes a rotating tube, the interior of the rotating tube is arranged as a third pressure relief and slag discharge channel which is through front and back and has a circular cross-section, an external shell is sleeved on the rotating tube, an annular flow supply chamber is formed between the external shell and the rotating tube, the external shell is provided with a cylindrical portion extending outward along the annular flow supply chamber, the center of the cylindrical portion is arranged as a first flow supply channel which is through up and down, the first flow supply channel is connected with the annular flow supply chamber, a second threaded joint is arranged at the front end of the rotating tube, the second threaded joint includes a second threaded section and a second extension section, the outer diameter of the second threaded section is smaller than the outer diameter of the rotating tube, the outer diameter of the second extension section is smaller than the outer diameter of the second threaded section, a plurality of second arc grooves arranged along the front and back directions are arranged on the outside of the second threaded section, a second male thread is arranged on the outer surface of the second threaded section, and the flow supply and slag discharger is installed on the rear end of the sieve hole spiral drill rod at the rear end through the threaded cooperation of the second male thread and the first female thread.

[0006] The interior of the first spiral blade is configured as a second flow supply channel, and the front and rear ends of the first spiral blade are both provided with flow holes facing the inside of the drill rod body, a first axial flow supply channel is axially arranged between the inner wall and the outer wall at both ends of the drill rod body, a first vertical flow supply channel is arranged between the flow hole and the first axial flow supply channel and the flow hole, the first axial flow supply channel passes through the front end surface of the drill rod body and its extension line is located in the first arc-shaped groove.

[0007] The cross section of the second flow supply channel is circular, square or elliptical.

[0008] The drill rod body is provided with a plurality of first air-release and slag-inlet sieve holes connected to the first pressure-release and slag-inlet channel, and the drill handle is provided with a plurality of second air-release and slag-inlet sieve holes connected to the second pressure-release and slag-inlet channel.

[0009] A second axial fluid supply channel is arranged between the inner wall and the outer wall of the drill shank, a punching nozzle is arranged on the cutting edge, a second vertical fluid supply channel is arranged between the punching nozzle and the second axial fluid supply channel, the upper end of the second vertical fluid supply channel is connected to the punching nozzle, and the lower end of the second vertical fluid supply channel is connected to the second axial fluid supply channel. A cutting blade is arranged on the rotating stopper, and the rotating stopper is hinged at the right end of the rotating tube. Under the action of a large thrust, the rotating stopper will flip forward, so that the second pressure relief and slag discharge channel of the open and closed drilling and punching drill bit is completely unobstructed.

[0010] A third axial flow supply channel is arranged between the inner wall and the outer wall of the rotating tube. The third axial flow supply channel runs through the front end surface of the rotating tube and its extension line is located in the second arc-shaped groove.

[0011] The open-and-closed drilling and punching drill bit and the screen hole spiral drill rod of the present invention both have the function of slag feeding and pressure relief, which can greatly reduce the rotational resistance of the drill rod body and the drill shank. Under the condition of a certain drilling rig torque, the drilling depth of soft coal seam drilling is greatly improved, thereby ensuring a good drilling gas extraction effect.

[0012] When drilling in an upward through-layer borehole, the pressure relief and blowout prevention spiral drill of the present invention not only has the function of spiral slag removal by spiral blades, but also can assist slag removal through fluid and gravity, thereby greatly improving the slag removal efficiency of upward hole drilling in soft coal seams, thereby improving the drilling efficiency.

[0013] The pressure relief and blowout prevention spiral drilling tool of the present invention has a large diameter structure. The diameters of the first pressure relief and slag discharge channel, the second pressure relief and slag discharge channel and the third pressure relief and slag discharge channel are consistent, and there is no diameter change, which facilitates the hole protection device to enter the borehole to perform the lower screen pipe hole protection of the coal seam section of the through-layer drilling, thereby improving the drilling service cycle and further improving the gas extraction rate.

[0014] The cutting edge of the present application is equipped with a radial punching nozzle, which can be used for slag removal during low-pressure drilling, and can be used for punching when high-pressure water is injected. The permeability of the coal seam can be effectively improved by punching the coal seam section, further improving the gas extraction effect.

[0015] In summary, the present invention has a simple structure and is easy to operate. It can avoid the accumulation of high-pressure gas inside the borehole, thereby achieving the function of pressure relief and blowout prevention, greatly improving the slag removal efficiency of the borehole and reducing the rotation resistance of the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the pressure relief and blowout prevention spiral drilling tool of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the sieve hole spiral drill rod of the present invention.

[0018] Figure 3 It is a partial cross-sectional view of the sieve hole spiral drill rod of the present invention.

[0019] Figure 4 It is a schematic diagram of the internal structure of the sieve hole spiral drill rod of the present invention.

[0020] Figure 5 yes Figure 4 Left view of .

[0021] Figure 6 yes Figure 4 Right view of .

[0022] Figure 7 It is a structural schematic diagram of the threaded connection between the sieve hole spiral drill rods of the present invention.

[0023] Figure 8 yes Figure 7 Section view of the AA plane.

[0024] Fig. 9 It is a schematic structural diagram of an embodiment of the first spiral blade in the present invention.

[0025] Fig.10 It is a structural schematic diagram of an embodiment of the cross section of the second flow supply channel in the present invention.

[0026] Fig.11 It is a structural schematic diagram of another embodiment of the cross section of the second flow supply channel in the present invention.

[0027] Fig.12 It is a structural schematic diagram of the open-and-closed drilling and punching drill bit of the present invention.

[0028] Fig.13 It is a schematic diagram of the internal structure of the open-and-closed drilling and punching drill bit of the present invention.

[0029] Fig.14 It is a schematic structural diagram of the closing of the rotary stopper of the open-and-closed drilling and punching drill bit of the present invention.

[0030] Fig.15 It is a structural schematic diagram of the open and close type drilling and punching drill bit of the present invention with the rotary stopper opened.

[0031] Fig.16 It is a structural schematic diagram of the slag supply and discharge device of the present invention.

[0032] Fig.17 It is a schematic diagram of the internal structure of the slag supply and discharge device of the present invention.

[0033] Fig.18 It is a schematic structural diagram of the closed claws of the hole protection device of the present invention.

[0034] Fig.19 It is a schematic structural diagram of the hole protection device of the present invention when the claws are opened.

[0035] Fig. 20 It is a structural schematic diagram of the arc bottom groove of the present invention.

[0036] Fig.21 It is a structural schematic diagram of the inverted trapezoidal groove of the present invention.

[0037] Fig. 22 It is a structural schematic diagram of the rectangular groove of the present invention.

[0038] Fig.23 yes Figure 2 A schematic structural diagram of another embodiment of the first threaded joint. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0040] Embodiment 1 like Figure 1-22 As shown, a novel through-layer drilling pressure relief and blowout prevention spiral drilling tool comprises a plurality of mutually connected sieve hole spiral drill rods 1, an open-and-closed drilling and punching drill bit 2 arranged at the front end of the frontmost sieve hole spiral drill rod 1, and a slag supply and discharge device 3 arranged at the rear end of the rearmost sieve hole spiral drill rod 1, the sieve hole spiral drill rod 1 comprises a drill rod body 4, the interior of the drill rod body 4 is arranged with a first pressure relief and slag discharge channel 5 which is through-through and has a circular cross section, a first threaded joint 6 is arranged at the front end of the drill rod body 4, the first threaded joint 6 comprises a first threaded section 7 and a first extension section 8, the outer diameter of the first threaded section 7 is smaller than the outer diameter of the drill rod body 4, the outer diameter of the first extension section 8 is smaller than the outer diameter of the first threaded section 7, a plurality of first arc grooves 9 arranged along the front-to-back direction are arranged on the outside of the first threaded section 7, a first male thread 10 is arranged on the outer surface of the first threaded section 7, a first spiral blade 11 extending from the rear end of the drill rod body 4 to the front end of the drill rod body 4 is arranged on the outer surface of the drill rod body 4, and a first female thread 12 is arranged inside the rear end of the drill rod body; The open-and-close drill punch bit 2 includes a drill shank 13, the interior of the drill shank 13 is provided with a second pressure relief and slag discharge channel 14 which is through-through and has a circular cross section, the second pressure relief and slag discharge channel 14 is communicated with the first pressure relief and slag discharge channel 5, the front end of the drill shank 13 is evenly provided with a plurality of cutting edges 15 along the circumferential direction, the rear end of the drill shank 13 is provided with a second female thread 16 corresponding to the first male thread 10, the open-and-close drill punch bit 2 is installed on the front end of the frontmost sieve hole spiral drill rod 1 through the threaded cooperation of the first male thread 10 and the second female thread 16, the outer surface of the drill shank 13 is provided with a second spiral blade 17, and the front end center of the drill shank 13 is provided with a rotating stopper 18; The slag discharger 3 includes a rotating tube 19, the interior of the rotating tube 19 is provided with a third pressure relief slag discharge channel 20 which is through front and back and has a circular cross section, an outer shell 21 is sleeved on the rotating tube 19, an annular flow supply cavity 22 is formed between the outer shell 21 and the rotating tube 19, the outer shell 21 is provided with a cylindrical portion 23 extending outward along the annular flow supply cavity 22, the center of the cylindrical portion 23 is provided with a first flow supply channel 24 which is through from top to bottom, the first flow supply channel 24 is connected to the annular flow supply cavity 22, and a second threaded connection is provided at the front end of the rotating tube 19. The second threaded joint 25 includes a second threaded section 26 and a second extension section 27. The outer diameter of the second threaded section 26 is smaller than the outer diameter of the rotating tube 19. The outer diameter of the second extension section 27 is smaller than the outer diameter of the second threaded section 26. The outer surface of the second threaded section 26 is provided with a plurality of second arc grooves 28 arranged in the front-to-back direction. The outer surface of the second threaded section 26 is provided with a second male thread 29. The supply slag discharger 3 is installed at the rear end of the rearmost sieve hole auger rod 1 through the threaded cooperation of the second male thread 29 and the first female thread 12. An annular transition chamber 44 is provided between the sieve hole auger rods 1 through the threaded connection, so that the fluid in the supply channel passes through the annular transition chamber 44 and enters the supply channel of the next sieve hole auger rod 1 from the rear end sieve hole auger rod 1, and then is supplied to the open-close drilling and punching drill bit 2.

[0041] The interior of the first spiral blade 11 is provided with a second flow supply channel 31. There is no need to provide a spiral flow supply pipe separately. The second flow supply channel 31 is directly provided inside the first spiral blade 11. In addition, the front and rear ends of the first spiral blade 11 are provided with flow holes 32 facing the interior of the drill rod body 4. A first axial flow supply channel 33 is axially provided between the inner wall and the outer wall at both ends of the drill rod body 4. A first vertical flow supply channel 34 is provided between the flow hole 32 and the first axial flow supply channel 33 and the flow hole 32. The first axial flow supply channel 33 passes through the front end surface of the drill rod body 4 and its extension line is located in the first arc-shaped groove 9. The front and rear ports of the first spiral blade 11 are closed, so that the second flow supply channel 31 is only connected to the first vertical flow supply channel 34 and the first axial flow supply channel 33 through the flow hole 32, thereby simplifying the drilling tool structure and reducing the production cost.

[0042] The cross section of the second flow supply channel 31 is circular, square or elliptical; The drill rod body 4 is provided with a plurality of first degassing and slag feeding sieve holes 35 connected to the first pressure relief and slag discharge channel 5, and the drill handle 13 is provided with a plurality of second degassing and slag feeding sieve holes 36 connected to the second pressure relief and slag discharge channel 14. In order to improve the slag feeding effect of the first degassing and slag feeding sieve holes 35 and the second degassing and slag feeding sieve holes 36 and avoid them being blocked by drilling slag, the first degassing and slag feeding sieve holes 35 and the second degassing and slag feeding sieve holes 36 can be set to an inverted cone structure with a small mouth and a large inside.

[0043] A second axial flow channel 38 is provided between the inner wall and the outer wall of the drill handle 13, a punching nozzle 37 is provided on the cutting edge 15, a second vertical flow channel 39 is provided between the punching nozzle 37 and the second axial flow channel 38, the upper end of the second vertical flow channel 39 is connected to the punching nozzle 37, and the lower end of the second vertical flow channel 39 is connected to the second axial flow channel 38, a cutting blade is provided on the rotating stopper 18, and the rotating stopper 18 is hinged at the right end of the rotating tube 19. Under the action of a large thrust, the rotating stopper 18 will flip forward, so that the second pressure relief and slag removal channel 14 of the open and close drilling and punching drill bit 2 is completely unblocked; A third axial fluid supply channel 40 is provided between the inner wall and the outer wall of the rotating tube 19 . The third axial fluid supply channel 40 penetrates the front end surface of the rotating tube 19 and its extension line is located in the second arc-shaped groove 28 .

[0044] When the present application is used, the drilling rig is first moved to the drilling position, the drilling rig is fixed, and the pressure relief and blowout prevention spiral drilling tool is installed on the drilling rig; then the construction angle of the drilling rig is adjusted, and the drilling rig is turned on to drive the pressure relief and blowout prevention spiral drilling tool to drill; specifically, low-pressure water or pressure air flow is injected into the pressure relief and blowout prevention spiral drilling tool through the first flow supply channel 24 of the cylindrical part 23, and the low-pressure water or pressure air flow enters the annular flow supply cavity 22 through the first flow supply channel 24, and then passes through the third axial flow supply channel 40. It flows into the second flow supply channel 31 of the sieve hole spiral drill rod 1, and finally enters the borehole through the second axial flow supply channel 38 of the open and close drilling and punching drill bit 2 via the punching nozzle 37, so that part of the drill cuttings and gas in the borehole is discharged outward through the gap between the pressure relief and blowout prevention spiral drill and the inner wall of the borehole, and the other part enters the first pressure relief and slag discharge channel 5 and the second pressure relief and slag discharge channel 14 through the first air relief and slag inlet sieve hole 35 and the second air relief and slag inlet sieve hole 36, and is then discharged from the hole under the action of fluid and gravity.

[0045] After the drilling reaches the designated position, a high-pressure water flow is provided into the drill bit for punching operations; specifically, high-pressure water is injected into the pressure relief and blowout prevention spiral drill bit through the first flow supply channel 24 of the cylindrical portion 23, and the high-pressure water enters the annular flow supply chamber 22 through the first flow supply channel 24, and then flows into the second flow supply channel 31 of the sieve hole spiral drill rod 1 through the third axial flow supply channel 40, and finally is ejected through the second axial flow supply channel 38 of the open-and-close drill bit 2 through the punching nozzle 37, and the ejected high-pressure water flow punches and increases the permeability of the coal hole section of the through-layer drilling hole.

[0046] After the punching is completed, the hole protection device is sent to the bottom of the borehole through the drilling tool, so that the hole protection device is clamped on the borehole wall to protect the borehole, thereby realizing efficient extraction of borehole gas. Specifically, the hole protection device includes a hanging head 41 and a screen tube 42, the screen tube 42 is a detachable screen tube 42, and a plurality of screen holes 46 are arranged on the screen tube 42. A plurality of connected screen tubes 42 are connected to the rear end of the hanging head 41, and the front end of the hanging head 41 is arranged as a conical structure. The inside of the hanging head 41 is provided with an ejection mechanism, and the ejection mechanism includes symmetrically arranged claws 43 and springs, and the surface of the hanging head 41 is provided with a through hole 45 corresponding to the claws 43. After punching is completed, the hole protection device is sent to the bottom of the borehole through the third pressure relief and slag discharge channel 20, the first pressure relief and slag discharge channel 5 and the second pressure relief and slag discharge channel 14. During the sending process, it will be blocked by the rotating block 18 in the second pressure relief and slag discharge channel 14, and a thrust is applied to the hole protection device. The rotating block 18 rotates forward under the action of the thrust to open the second pressure relief and slag discharge channel 14, and the hole protection device enters the borehole. After the hole protection device enters the borehole, the claw 43 in the hanging head 41 pops out through the through hole under the action of the spring and gets stuck on the borehole wall. Finally, the pressure relief and blowout prevention spiral drill is withdrawn from the borehole, and the hole protection device remains in the borehole for gas extraction.

[0047] The gas in the deep of the borehole of the present invention can enter the second pressure relief slag discharge channel 14 and the first pressure relief slag discharge channel 5 through the second air relief slag inlet sieve hole of the open-close drill bit 2 and the first air relief slag inlet sieve hole of the sieve hole spiral drill rod 1, and directly connect to the outside of the borehole through the third pressure relief slag discharge channel 20 of the slag discharger 3, effectively solving the technical problems of the spray hole caused by abnormal gas outflow in the hole and the spray hole caused by the collapse and blockage of the borehole. The open-close drill bit 2 and the sieve hole spiral drill rod 1 of the present invention both have the function of slag inlet and pressure relief, which can greatly reduce the rotational resistance of the drill rod body and the drill handle 13. Under the condition of a certain torque of the drilling rig, the drilling depth of the soft coal seam drilling hole is greatly improved, thereby ensuring a good drilling gas extraction effect. When drilling in the upward through-layer drilling hole, in addition to the function of spiral blade spiral slag discharge, the pressure relief and blowout prevention spiral drilling tool of the present invention can also assist slag discharge through fluid and gravity, greatly improving the slag discharge efficiency of soft coal seam upward hole drilling, thereby improving the drilling efficiency. The pressure relief and blowout prevention spiral drilling tool of the present invention is a large-diameter structure. The diameters of the first pressure relief and slag discharge channel, the second pressure relief and slag discharge channel, and the third pressure relief and slag discharge channel are consistent, and there is no diameter change, which is convenient for the hole protection device to enter the borehole to perform the lower screen pipe hole protection of the coal seam section of the through-layer drilling, thereby improving the drilling service cycle and further improving the gas extraction rate. A radial punching nozzle 37 is installed on the cutting edge 15 of the present application, which can be used for slag discharge during low-pressure drilling, and can be punched when high-pressure water is injected. The permeability of the coal seam can be effectively improved by punching the coal seam section, further improving the gas extraction effect. When the pressure relief and blowout prevention spiral drill is used in the present application to perform upward drilling in the coal (rock) layer, a part of the drill cuttings outside the drill tool will be discharged outwardly through the spiral conveying action of the outer blades of the pressure relief and blowout prevention drill tool, and the other part will enter the first pressure relief and slag discharge channel and the second pressure relief and slag discharge channel of the pressure relief and blowout prevention spiral drill tool through the first air relief and slag inlet sieve hole and the second air relief and slag inlet sieve hole. The entered drill cuttings will be discharged outwardly along the first pressure relief and slag discharge channel, the second pressure relief and slag discharge channel and the third pressure relief and slag discharge channel under the action of fluid and gravity. The rotation of the drill tool will reduce the resistance between the drill cuttings and the wall of the pressure relief and slag discharge channel, thereby accelerating the sliding speed.

[0048] It should be noted that the first arc-shaped groove 9 provided outside the first threaded section 7 (male thread) of the sieve hole auger rod 1 of the present invention may also be Figure 20-22 The arc bottom groove, inverted trapezoidal groove or rectangular groove shape shown in the figure can be selected and appropriately optimized according to the construction conditions for the strength of the sieve auger rod 1 and the flow rate requirements in actual application.

[0049] Embodiment 2 The differences from the first embodiment are as follows: Fig.23As shown, in the use scenario where deep hole drilling is required, the screen hole spiral drill rod 1 should have higher strength. Therefore, in order to improve the strength of the first threaded section 7 (male thread) at the front end of the drill rod body 4, the first axial flow supply channel 33 is directly set in the wall thickness of the first threaded section 7 instead of setting the arc groove on the surface of the first threaded section 7, while appropriately reducing the diameter of the first pressure relief and slag discharge channel 5 and increasing the wall thickness of the first threaded section 7. In this way, the first threaded section 7 is a complete threaded structure, and the threaded connection structure strength of the drill rod is improved.

[0050] In addition, the inner hole of the drill rod body 4 of the sieve hole auger drill rod 1 can also be an unequal diameter structure, that is, the wall thickness at the first threaded joint 6 and the first female thread 12 is increased inwardly, and correspondingly, the inner hole diameter at the first threaded joint 6 and the first female thread 12 becomes smaller, which can also improve the strength of the sieve hole auger drill rod 1.

[0051] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A new type of through-layer drilling pressure relief and blowout prevention spiral drilling tool, characterized in that: The invention comprises a plurality of mutually connected sieve hole spiral drill rods, an open-and-closed drilling and punching drill bit arranged at the front end of the frontmost sieve hole spiral drill rod, and a slag supply and discharge device arranged at the rear end of the rearmost sieve hole spiral drill rod, the sieve hole spiral drill rod comprises a drill rod body, the interior of the drill rod body is arranged with a first pressure relief and slag discharge channel which is through front and back and has a circular cross section, the front end of the drill rod body is arranged with a first threaded joint, the first threaded joint comprises a first threaded section and a first extension section, the outer diameter of the first threaded section is smaller than the outer diameter of the drill rod body, the outer diameter of the first extension section is smaller than the outer diameter of the first threaded section, the outside of the first threaded section is arranged with a plurality of first arc grooves arranged along the front-to-back direction, the outer surface of the first threaded section is arranged with a first male thread, the outer surface of the drill rod body is arranged with a first spiral blade extending from the rear end of the drill rod body to the front end of the drill rod body, and the rear end of the drill rod body is arranged with a first female thread; The open-and-close drill punch bit comprises a drill shank, the interior of the drill shank is provided with a second pressure relief and slag discharge channel which is through front and back and has a circular cross section, the second pressure relief and slag discharge channel is connected with the first pressure relief and slag discharge channel, the front end of the drill shank is evenly provided with a plurality of cutting edges along the circumferential direction, the rear end of the drill shank is provided with a second female thread corresponding to the first male thread, the open-and-close drill punch bit is installed on the front end of the frontmost sieve hole spiral drill rod through the thread matching of the first male thread and the second female thread, the outer surface of the drill shank is provided with a second spiral blade, and a rotating stopper is provided at the front end center of the drill shank; The flow supply and slag discharger includes a rotating tube, the interior of the rotating tube is arranged as a third pressure relief and slag discharge channel which is through front and back and has a circular cross-section, an external shell is sleeved on the rotating tube, an annular flow supply chamber is formed between the external shell and the rotating tube, the external shell is provided with a cylindrical portion extending outward along the annular flow supply chamber, the center of the cylindrical portion is arranged as a first flow supply channel which is through up and down, the first flow supply channel is connected with the annular flow supply chamber, a second threaded joint is arranged at the front end of the rotating tube, the second threaded joint includes a second threaded section and a second extension section, the outer diameter of the second threaded section is smaller than the outer diameter of the rotating tube, the outer diameter of the second extension section is smaller than the outer diameter of the second threaded section, a plurality of second arc grooves arranged along the front and back directions are arranged on the outside of the second threaded section, a second male thread is arranged on the outer surface of the second threaded section, and the flow supply and slag discharger is installed on the rear end of the sieve hole spiral drill rod at the rear end through the threaded cooperation of the second male thread and the first female thread.

2. The novel through-layer drilling pressure relief and blowout prevention spiral drilling tool according to claim 1 is characterized by: The interior of the first spiral blade is configured as a second flow supply channel, and the front and rear ends of the first spiral blade are both provided with flow holes facing the inside of the drill rod body, a first axial flow supply channel is axially arranged between the inner wall and the outer wall at both ends of the drill rod body, a first vertical flow supply channel is arranged between the flow hole and the first axial flow supply channel and the flow hole, the first axial flow supply channel passes through the front end surface of the drill rod body and its extension line is located in the first arc-shaped groove.

3. The novel through-layer drilling pressure relief and blowout prevention spiral drilling tool according to claim 2 is characterized by: The cross section of the second flow supply channel is circular, square or elliptical.

4. The novel through-layer drilling pressure relief and blowout prevention spiral drilling tool according to claim 3 is characterized by: The drill rod body is provided with a plurality of first air-release and slag-inlet sieve holes connected to the first pressure-release and slag-inlet channel, and the drill handle is provided with a plurality of second air-release and slag-inlet sieve holes connected to the second pressure-release and slag-inlet channel.

5. The novel through-layer drilling pressure relief and blowout prevention spiral drilling tool according to claim 4 is characterized by: A second axial fluid supply channel is arranged between the inner wall and the outer wall of the drill shank, a punching nozzle is arranged on the cutting edge, a second vertical fluid supply channel is arranged between the punching nozzle and the second axial fluid supply channel, the upper end of the second vertical fluid supply channel is connected to the punching nozzle, and the lower end of the second vertical fluid supply channel is connected to the second axial fluid supply channel. A cutting blade is arranged on the rotating stopper, and the rotating stopper is hinged at the right end of the rotating tube. Under the action of a large thrust, the rotating stopper will flip forward, so that the second pressure relief and slag discharge channel of the open and closed drilling and punching drill bit is completely unobstructed.

6. The novel through-layer drilling pressure relief and blowout prevention spiral drilling tool according to claim 5 is characterized by: A third axial flow supply channel is arranged between the inner wall and the outer wall of the rotating tube. The third axial flow supply channel runs through the front end surface of the rotating tube and its extension line is located in the second arc-shaped groove.

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