Sound-liquid synergic integrated antireflection drill pipe

Abstract

The present application relates to the field of mine gas prevention and treatment, and discloses a sound-liquid synergistic integrated permeability increasing drill rod, which comprises an outer pipe and an inner pipe arranged in the outer pipe, the two ends of the outer pipe are fixedly connected with a male head and a female head respectively, and the female head is connected with a composite drill bit; the pipe wall of the outer pipe is provided with a through hole area, and the through hole area is provided with a plurality of through holes penetrating through; a cavity with a ring-shaped cross section is opened in the pipe wall, an electric telescopic rod and a hatch with a ring-shaped cross section are arranged in the cavity, and the hatch moves up and down in the cavity; one end of the inner pipe is located in the through hole area and is sealingly connected with an ultrasonic transducer, the other end is provided with a cable connector, and the cable connector is connected with a cable core; the cable of the ultrasonic transducer is electrically connected with the cable connector through the cavity of the inner pipe; the present application can realize sound-liquid synergistic permeability increasing of the coal seam, the advantages of the permeability increasing measures are complementary, the two can synergistically increase the flow, the permeability of the coal seam is increased, the gas extraction rate of the coal seam is improved, and the drill rod does not need to be repeatedly connected and disconnected during the permeability increasing drilling process, the operation is simple and efficient during the construction process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine gas prevention and control, in particular to a sound-liquid synergistic integrated permeability enhancement drill rod. BACKGROUND

[0002] At present, most of the deep coal seam gas has the characteristics of "three high and two low", that is, high gas content, high plasticity structure and high adsorption gas capacity of coal seam; low coal seam permeability, low proportion of conventional fracture fissure under strengthening measures. Especially, the deep coal seam has low permeability, and the effect of conventional drilling for pre-draining coal seam gas is not ideal.

[0003] In order to improve the coal seam gas pre-drainage rate and shorten the pre-drainage time, it is necessary to take strengthening and flow increasing measures for the coal seam. At present, the commonly used gas flow increasing technologies in mines include: cross drilling flow increasing technology, which has large drilling engineering quantity and unsatisfactory flow increasing effect; hydraulic flow increasing technology, which has problems such as large water consumption, water locking effect and the like; blasting flow increasing technology, such as gunpowder blasting, electric blasting and gas blasting, which is easy to cause secondary hazards and relatively complex to operate; field flow increasing technology, such as electromagnetic field, sound field and microwave field, which has the problem of small influence range. In order to solve the above problems of single flow increasing technology, the research means of combining two or more methods to increase the flow of coal seam has gradually attracted attention.

[0004] In the prior art, high-pressure water is used to form a fracture channel in the coal seam, but the fracturing water entering the coal body fracture channel will block the coal body pore microfracture, which is not conducive to gas desorption seepage. The ultrasonic excitation (sound wave with a frequency higher than 20 kHz) makes the coal body produce fractures through mechanical vibration, thermal effect and cavitation effect, etc., and promotes gas desorption seepage, but its propagation distance through the coal body medium is small, and the influence range is limited. In the field construction, if multiple means are used to synergistically increase the flow, the drill rod needs to be repeatedly connected and disconnected, the construction process is complex, and the permeability efficiency is low. SUMMARY

[0005] In view of the problems in the prior art, the present application aims to provide a sound-liquid synergistic integrated permeability enhancement drill rod, which uses high-pressure water and ultrasonic waves for synergistic permeability enhancement. The hydraulic fracturing measures and ultrasonic excitation are combined to produce a main channel for coal seam gas flow in the fractured coal body, the ultrasonic waves are effectively propagated with the help of water medium, the coal body fractures are further expanded, and the fracture channels are effectively dredged, which is beneficial to gas desorption seepage and improves the gas extraction effect. In the permeability drilling process, the drill rod does not need to be repeatedly connected and disconnected, the construction process is simple, the operation is simple, and the permeability effect and drilling efficiency can be effectively improved.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme.

[0007] The sound-liquid synergic integrated penetration enhancing drill rod comprises an outer tube and an inner tube arranged in the outer tube, the outer tube and the inner tube are coaxial, and a liquid cavity is formed between the outer tube and the inner tube.

[0008] The outer tube is fixedly connected with a male head and a female head at two ends respectively, and the female head is connected with a composite drill bit; a through hole area is arranged on the outer tube wall close to the female head, and a plurality of through holes penetrating the outer tube wall are arranged in the through hole area; a cavity with a ring-shaped cross section is arranged in the outer tube wall from the through hole area to the male head, a plurality of electric telescopic rods are arranged in the cavity close to the male head; a hatch with a ring-shaped cross section is arranged in the cavity, and the bottom of the hatch is connected with the rod head of the electric telescopic rod.

[0009] The side wall of the inner tube is fixedly connected with the inner wall of the outer tube through a fixing rod; one end of the inner tube is located in the through hole area, and the other end is flush with the top end of the male head; an ultrasonic transducer is sealingly connected to one end of the inner tube in the through hole area, and a cable connector is arranged at the other end of the inner tube, and the cable connector is connected with a cable core; the end of the cable core is flush with the top end of the male head; the cable of the ultrasonic transducer is electrically connected with the cable connector through the inner tube cavity; and the cable of the electric telescopic rod is electrically connected with the cable core.

[0010] The hatch can be moved upward in the cavity to contact the upper edge of the through hole area to close the through hole area, or moved downward to the outside of the through hole area to open the through hole area.

[0011] Preferably, an annular sealing groove is arranged on the upper edge of the through hole area, and the upper end of the hatch is inserted into the sealing groove when the hatch is moved upward.

[0012] Further preferably, the material of the sealing groove is rubber or silicone.

[0013] Preferably, the ultrasonic transducer is one ultrasonic transducer or a plurality of ultrasonic transducers connected in series.

[0014] Preferably, the through hole area comprises four support columns arranged circumferentially along the outer tube wall and four through holes separated by the four support columns.

[0015] Further preferably, the four support columns are uniformly distributed along the circumference of the outer tube wall.

[0016] Preferably, the number of electric telescopic rods is four, and the four electric telescopic rods are uniformly distributed.

[0017] Preferably, the material of the inner tube is an insulating and waterproof material.

[0018] A sound-liquid synergic integrated penetration enhancing drill rod system comprises the above drill rod and a plurality of connecting drill rods.

[0019] The connecting drill rod comprises an outer tube and an inner tube arranged in the outer tube, the two ends of the outer tube are fixedly connected with a male head and a female head respectively, and the side wall of the inner tube is fixedly connected with the inner wall of the outer tube through a fixing rod; the length of the inner tube is the same as that of the outer tube, one end of the inner tube is provided with a cable plug, and the other end is provided with a cable core, and the cable plug and the cable core are electrically connected;

[0020] When the male head of the drill rod is connected with the female head of the connecting drill rod, the cable core of the drill rod is in sealed electrical connection with the cable plug of the connecting drill rod; the male head of each connecting drill rod can be connected with the female head of other connecting drill rods.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] The sound-liquid synergistic permeability drill rod utilizes a high-pressure pump to provide high-pressure liquid, carries out drilling and cutting through a high-pressure water jet device and a fracturing drill bit, emits ultrasonic waves through an ultrasonic emitter after cutting and fracturing, and utilizes ultrasonic cavitation effect, thermal effect and mechanical vibration effect to carry out ultrasonic permeability improvement on coal bodies; the drilling process does not need to repeatedly connect and disconnect drilling tools, and the sound-liquid synergistic permeability is integrated, the construction process is simple, the operation is simple and convenient, and the efficiency is high.

[0023] The sound-liquid synergistic permeability drill rod can carry out sound-liquid synergistic permeability improvement on coal seams, the advantages of the two permeability improvement measures are complementary, the two synergistic flow capacities can increase the permeability of coal seams and improve the coal seam gas extraction rate. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0025] Figure 1 Fig. 1 is a longitudinal sectional view of a sound-liquid synergistic integrated permeability drill rod;

[0026] Figure 2 Fig. 6 is a schematic view of a through-hole region of an outer rod;

[0027] Figure 3 Fig. 7 is a top view of one end of an outer rod connecting a female head;

[0028] Figure 4 Fig. 8 is a schematic view of an electric telescopic rod region of an outer rod;

[0029] Figure 5 Fig. 9 is a bottom view of one end of an outer rod connecting a male head;

[0030] The drawings are identified as:

[0031] 1. outer tube; 2. inner tube; 3. liquid cavity; 4. fixed rod; 11. male head; 12. female head; 13. through-hole area; 14. cavity; 15. electric telescopic rod; 16. hatch; 17. sealing groove; 18. support column; 19. electric telescopic rod cable; 21. ultrasonic transducer; 22. cable joint; 23. cable core; 24. ultrasonic transducer cable. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application.

[0033] The sound-liquid synergistic integrated penetration drilling rod of the present application uses a high-pressure pump to provide high-pressure liquid, uses a high-pressure water jet device and a fracturing drill bit to drill and cut, and uses a low-loss ultrasonic excitation cable to make the ultrasonic transducer emit ultrasonic waves after the cutting and fracturing are completed, and uses the ultrasonic cavitation effect, thermal effect and mechanical vibration effect to perform ultrasonic penetration on the coal body.

[0034] Figure 1 It is a longitudinal sectional view of the sound-liquid synergistic integrated penetration drilling rod. As shown in Figure 1 The sound-liquid synergistic integrated penetration drilling rod includes an outer tube 1 and an inner tube 2 arranged in the outer tube 1, the outer tube and the inner tube are coaxial, and a liquid cavity 3 is formed between the outer tube and the inner tube. The material of the inner tube is an insulating and waterproof material, and the inner tube is used as a cable tube for packaging cables or wires.

[0035] The outer tube 1 is fixedly connected with a male head 11 and a female head 12 at both ends, respectively, and the female head is connected with a composite drill bit. The composite drill bit includes a high-pressure water jet device and a fracturing drill bit. In use, a high-pressure water source is pumped into the liquid cavity by a high-pressure water pump, a high-pressure water jet is formed by the high-pressure water jet device, and the coal seam is cut and fractured by hydraulic fracturing.

[0036] A through-hole area 13 is arranged on the outer tube wall near the female head 12, and the through-hole area 13 is provided with a plurality of through-holes penetrating the outer tube wall; a cavity 14 with a ring-shaped cross section is arranged in the outer tube wall from the upper end of the through-hole area to the male head, and a plurality of electric telescopic rods 15 are arranged in the cavity near the male head; and a hatch 16 with a ring-shaped cross section is arranged in the cavity, as shown in Figure 2 .

[0037] As shown in Figure 4 The bottom of the hatch is connected with the rod head of the electric telescopic rod, and the electric telescopic rod 15 can drive the hatch to move up and down in the cavity when it is extended and retracted. The hatch can be moved up to contact the upper end of the through-hole area to close the through-hole area, and at this time, the water in the liquid cavity will not leak from the through-hole area; the hatch can be moved down to the lower part of the through-hole area to open the through-hole area.

[0038] The side wall of the inner tube 2 is fixedly connected with the inner wall of the outer tube 1 through the fixing rod 4; one end of the inner tube 2 is located in the through hole area, and the other end is flush with the top end of the male head; the end of the inner tube 2 in the through hole area is sealingly connected with an ultrasonic transducer 21 for converting electrical energy into ultrasonic waves; as shown in Figure 1 and Figure 5 , the other end of the inner tube is provided with a cable connector 22, one side of the cable connector is connected with a cable core 23, and the end of the cable core is flush with the top end of the male head; the cable 24 of the ultrasonic transducer is electrically connected with the cable connector through the cavity of the inner tube; the cable 19 of the electric telescopic rod is electrically connected with the cable core; the cable core is connected with a power supply or a cable connector of another drill pipe, so as to provide electrical energy for the ultrasonic transducer and the electric telescopic rod. The cable is preferably a low-loss ultrasonic excitation cable.

[0039] Further, an annular sealing groove 17 opening downward is arranged on the upper side of the through hole area, when the hatch is moved upward, the upper end of the hatch is inserted into the sealing groove, so as to further improve the sealing effect of the hatch and prevent leakage when water flows in the liquid cavity. The sealing groove is made of rubber or silicone, and is preferably high-pressure-resistant sealing rubber.

[0040] Further, one ultrasonic transducer is arranged, or a plurality of ultrasonic transducers are connected in series. As shown in Figure 2 , when a plurality of ultrasonic transducers are connected in series, the whole ultrasonic transducer group after connection is located in the through hole area, so that the ultrasonic waves are transmitted from the drill pipe through the through hole area. In this embodiment, 30 ultrasonic transducers are connected in series.

[0041] Further, as shown in Figure 2 , Figure 3 , the through hole area includes four support columns 18 arranged along the circumference of the outer tube wall and four through holes separated by the four support columns. The four support columns are uniformly distributed along the circumference of the outer tube wall, so as to expand the area of the through hole without affecting the strength of the through hole area, which is beneficial to the propagation of ultrasonic waves.

[0042] Further, the number of electric telescopic rods is four, and the four electric telescopic rods are uniformly distributed, so as to uniformly distribute the force on the hatch and ensure that the hatch can stably ascend and descend.

[0043] The application also provides an acoustic-liquid collaborative integrated penetration enhancing drill pipe system, which comprises the above-mentioned acoustic-liquid collaborative integrated penetration enhancing drill pipe and a plurality of connecting drill pipes.

[0044] The connecting drill pipe comprises an outer tube and an inner tube arranged in the outer tube, the two ends of the outer tube are fixedly connected with a male head and a female head respectively, and the side wall of the inner tube is fixedly connected with the inner wall of the outer tube through a fixing rod; the length of the inner tube is the same as that of the outer tube, one end of the inner tube is provided with a cable connector, and the other end is provided with a cable core, and the cable connector and the cable core are electrically connected;

[0045] When the male head of the sound-liquid synergic integrated anti-reflection drill rod is connected with the female head of the connecting drill rod, the cable core of the sound-liquid synergic integrated anti-reflection drill rod is in sealed electrical connection with the cable plug of the connecting drill rod; after the connecting drill rod and the sound-liquid synergic integrated anti-reflection drill rod are connected, the use length of the sound-liquid synergic integrated anti-reflection drill rod is increased; in addition, the male head of each connecting drill rod can be connected with the female head of other connecting drill rods, further increasing the use length of the sound-liquid synergic integrated anti-reflection drill rod.

[0046] The working principle of the sound-liquid synergic integrated anti-reflection drill rod is as follows:

[0047] When the sound-liquid synergic integrated anti-reflection drill rod is used in a coal roadway or a floor drainage roadway, a drilling and cutting integrated device equipped with the sound-liquid synergic integrated anti-reflection drill rod is used to construct a bedding drill hole or an upward crossing drill hole in a coal seam; at this time, the hatch of the sound-liquid synergic integrated anti-reflection drill rod is closed, and the through hole area is in a closed state. The drilling and cutting integrated device uses compressed air, low-pressure water or static pressure water to assist in drilling and discharging slag; when the drill hole reaches the designed position, the drill rod remains in a rotating state, a high-pressure water pump is started, and the coal wall is cut by high-pressure water jet; after the coal wall is cut by the high-pressure water jet, the drill hole is blocked by the obturator, at this time the drill rod stops rotating, and directional hydraulic fracturing is carried out by using the water guide groove.

[0048] After the fracturing is completed, the hatch is opened, the through hole area is in an open state, the low-loss ultrasonic excitation cable transmits signals to the ultrasonic transducer, emits ultrasonic waves, and performs ultrasonic permeability enhancement on the low-permeability coal seam under the action of ultrasonic cavitation, heat and mechanical vibration effects.

[0049] Although the present application has been described in detail in the specification and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present application. Therefore, these modifications or improvements made without departing from the spirit of the present application are within the scope of the present application.

Claims

1. A sound-liquid synergistically integrated anti-friction drill pipe, characterized in that, It includes an outer tube (1) and an inner tube (2) disposed inside the outer tube (1), the outer tube and the inner tube are coaxial, and a liquid cavity (3) is formed between the outer tube and the inner tube; The outer tube (1) is fixedly connected to a male head (11) and a female head (12) at both ends, and the female head is connected to a composite drill bit; a through hole area (13) is provided on the outer tube wall near the female head (12), and the through hole area (13) is provided with multiple through holes penetrating the outer tube wall; a cavity (14) with an annular cross-section is opened in the outer tube wall from the through hole area to the male head, and multiple electric telescopic rods (15) are provided in the cavity near the male head; a hatch (16) with an annular cross-section is provided in the cavity (14), and the bottom of the hatch is connected to the rod head of the electric telescopic rod; The sidewall of the inner tube (2) is fixedly connected to the inner wall of the outer tube (1) by a fixing rod (4); one end of the inner tube (2) is located in the through hole area, and the other end is flush with the top of the male head; an ultrasonic transducer (21) is sealed and connected to the end of the inner tube in the through hole area, and a cable connector (22) is provided at the other end of the inner tube, and a cable core (23) is connected to the cable connector; the end of the cable core (23) is flush with the top of the male head; the cable (24) of the ultrasonic transducer passes through the cavity of the inner tube and is electrically connected to the cable connector; the cable (19) of the electric telescopic rod is electrically connected to the cable core; The hatch can be moved upward within the cavity via an electric telescopic rod (15) to contact the upper edge of the through-hole area, thus closing the through-hole area, or moved downward outside the through-hole area, thus opening the through-hole area.

2. The acoustic-liquid synergic integrated antifouling drill pipe of claim 1, wherein, An annular sealing groove (17) with an opening facing downwards is provided on the upper edge of the through hole area. When the hatch moves upward, the upper end of the hatch is inserted into the sealing groove.

3. The acoustic-liquid synergic antifouling drill pipe of claim 2, wherein, The sealing groove is made of rubber or silicone.

4. The acoustic-liquid synergic integrated antifouling drill pipe of claim 1, wherein, The ultrasonic transducer is one ultrasonic transducer or multiple ultrasonic transducers connected in series.

5. The acoustic-liquid synergic integrated antifouling drill pipe of claim 1, wherein, The through-hole area includes four support columns (18) arranged circumferentially along the outer pipe wall and four through holes separated by the four support columns.

6. The acoustic-liquid synergic antifouling drill pipe of claim 5, wherein, The four support columns are evenly distributed circumferentially on the outer tube wall.

7. The acoustic-liquid synergic integrated antifouling drill pipe of claim 1, wherein, The number of electric telescopic poles is four, and the four electric telescopic poles are evenly distributed.

8. The acoustic-liquid synergic antifouling drill pipe of claim 1, wherein, The inner tube is made of an insulating and waterproof material.

9. A sound-liquid synergistically integrated anti-friction drill pipe system, characterized in that, Includes the drill pipe as described in any one of claims 1-8 and a plurality of connecting drill pipes; The connecting drill rod includes an outer tube and an inner tube disposed inside the outer tube. A male connector and a female connector are fixedly connected to both ends of the outer tube, and the side wall of the inner tube is fixedly connected to the inner wall of the outer tube by a fixing rod. The inner tube has the same length as the outer tube. A cable plug is provided at one end of the inner tube, and a cable core is provided at the other end. The cable plug and the cable core are electrically connected. When the male end of the drill rod is connected to the female end of the connecting drill rod, the cable core of the drill rod is electrically connected to the cable plug of the connecting drill rod in a sealed manner; each male end of the connecting drill rod can be interconnected with the female ends of other connecting drill rods.

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