Hollow rotary guide coring drilling tool for directional drilling and full-hole coring method

Abstract

The invention provides a directional drilling hollow rotary guide coring drilling tool and a full-hole coring method.The directional drilling hollow rotary guide coring drilling tool comprises an external drill rod and a coring drill bit, a straight spiral sliding rod is arranged in the external drill rod and comprises a sliding rod outer column and a hollow inner screw, the outer wall of the sliding rod outer column is smooth, and the hollow inner screw is arranged in the sliding rod outer column; a threaded groove is formed in the inner wall of the sliding rod outer column, and a threaded protrusion is arranged on the outer wall of the hollow inner screw rod, so that the hollow inner screw rod can generate axial displacement in the drilling direction along a threaded track provided by the threaded groove of the sliding rod outer column. A coring drill bit is connected with a straight spiral sliding rod, the outer wall of a sliding rod outer column is fixedly connected with the inner wall of an external drill rod, the external drill rod is connected with a gas-liquid-electricity coupling power screw motor, and the gas-liquid-electricity coupling power screw motor drives the sliding rod outer column connected with the inner wall of the external drill rod to rotate so as to drive a hollow inner screw to rotate reversely. And axial displacement is generated along the threaded track, so that the coring drill bit is driven to perform directional coring.

Description

Technical Field

[0001] The present invention relates to the fields of geotechnical engineering mechanics and drilling technology, and in particular to a directional drilling hollow rotary guide coring drill and a full-hole coring method. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Directional coring drilling uses in-hole testing technology to intuitively and accurately understand the adverse geological conditions in front of the tunnel face, so as to accurately divide the rock type changes of the tunnel design axis surrounding rock, the distribution range of the broken zone and the sudden water inrush of the tunnel, and realize the geological prediction of the tunnel surrounding rock. Directional coring drilling technology includes drilling, steering, coring, and measurement while drilling.

[0004] Directional drilling mainly uses the reaction force of the asymmetric drill bit slope to change the drilling direction and adjust the incident angle of the drill bit to achieve the purpose of deflection. However, the drill tool required for this deflection method has curvature and can only achieve drilling and coring. The coring operability is low in long-distance (such as kilometer-level) directional drilling projects. In existing studies, the ultimate bending strength of the drill pipe for safe operation in curved boreholes has been studied. When the drill tool is drilling in the curved section, the drill pipe is subjected to compression, torsion and bending loads, and the bending load is composed of the superposition of "passive" and "active" parts. The "passive" part is the bending load generated by the drill pipe due to the stress of the curved borehole, and the "active" part is the bending load generated by the axial pressure and torque transmitted by the drill pipe. During the drilling process, the drill pipe is subjected to bending deformation and rotates around its own axis under the state of bending moment. The stress in the drill pipe has an asymmetric cyclic alternating characteristic. The study ensures the ultimate bending strength of the drill rod for safe operation in a curved borehole by performing fatigue calculation on the drill rod under alternating stress. In the field of geotechnical engineering, obtaining cores and their mechanical parameters through coring drill bits is an effective means of solving the occurrence of rock formations or ground stresses. Compared with conventional methods, it can reduce drilling workload, speed up exploration, reduce exploration costs, improve test conditions, and increase accuracy, and has obvious advantages.

[0005] At present, the methods of directional drilling coring mostly stay at the point of taking the drill and coring. In addition, the rope coring method can achieve coring without lifting the drill or with very few times of lifting the drill by using a wire rope to salvage the core, but there is still a lack of technology and equipment for long-distance full-hole coring. Faced with the problems of difficulty in achieving rapid drilling and difficulty in controlling directional drilling, how to quickly and accurately extract high-quality cores from the rock mass is the key to directional coring equipment and is also the primary problem that needs to be overcome in directional drilling coring. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes a directional drilling hollow rotary guiding coring drill and a full-hole coring method, combines coring with directional drilling technology, proposes a hollow directional coring drill based on a straight spiral slide rod, and fully utilizes the screw trajectory designed in the drill and the space inside the hollow thin-wall drill to realize rapid rotary coring during the drilling process; and proposes a straight rod directional oblique coring method to realize coring during directional drilling.

[0007] According to some embodiments, the present disclosure adopts the following technical solutions:

[0008] A directional drilling hollow rotary guide coring drill, comprising an external drill rod and a coring drill bit, wherein the external drill rod has a built-in straight spiral slide rod, wherein the straight spiral slide rod comprises a slide rod outer column and a hollow inner screw rod, wherein the outer wall of the slide rod outer column is smooth, the inner wall of the slide rod outer column is provided with a thread groove, the outer wall of the hollow inner screw rod is provided with a thread protrusion, the outer wall of the hollow inner screw rod is threadedly connected to the inner wall of the slide rod outer column, and the hollow inner screw rod can generate axial displacement in the drilling direction along the thread track provided by the thread groove of the slide rod outer column;

[0009] The coring drill bit is connected to the straight spiral slide rod, the outer wall of the slide rod outer column is fixedly connected to the inner wall of the external drill rod, the external drill rod is connected to a gas-liquid-electric coupled power screw motor, the gas-liquid-electric coupled power screw motor drives the slide rod outer column connected to the inner wall of the external drill rod to rotate, thereby driving the hollow inner screw to rotate in the opposite direction, generating axial displacement along the threaded track, thereby driving the coring drill bit to perform directional coring.

[0010] Furthermore, the inner size of the core drill bit is larger than the external drill rod, and a four-divided petal-shaped slider is designed at a certain distance from the drill rod where it is connected to the core drill bit. The outer wall of the petal-shaped slider is convex, and the inner wall fits tightly with the internal straight spiral slide rod. During linear drilling, the diameter of the convex part is smaller than the diameter of the core drill bit.

[0011] Furthermore, the petal-shaped slider is connected to the external drill rod by a one-way bearing, which produces an angular displacement perpendicular to the drilling direction. At the contact point with the petal-shaped slider, an active hydraulic deflection device is provided on the outer side of the outer wall of the straight spiral slider. The active hydraulic deflection device is composed of a cylindrical block, which is densely and evenly distributed in the contact part. The displacement of the cylindrical block pushes the external petal-shaped slider to passively displace. After the displacement occurs, the diameter of the petal-shaped slider part increases, and the slider collides with the inner wall of the borehole to realize all-directional controllable directional deflection during directional drilling. A pressure sensor is provided at the protrusion of the petal-shaped slider.

[0012] Furthermore, the interior of the hollow inner screw is hollow, and a pressurizing device is provided inside the hollow inner screw. The pressurizing device can produce displacement along the diameter direction of the drill bit, and fully utilize the friction force through pressurization to achieve a close connection with the core, so that the taken core and the straight spiral slide rod produce the same displacement effect.

[0013] Furthermore, the thread groove on the inner wall of the outer column of the sliding rod and the thread protrusion on the outer wall of the hollow inner screw rod are both arranged in an arc shape to reduce the friction between the parts of the sliding rod.

[0014] Furthermore, the interior of the straight spiral slide rod is designed to be hollow, and synchronous displacement of the hollow inner screw rod and the core is achieved by pressurizing and fixing the core with the core drill bit after coring.

[0015] According to some embodiments, the present disclosure adopts the following technical solutions:

[0016] A full-hole coring method for a directional drilling hollow rotary guide coring drill comprises:

[0017] Get the set drilling trajectory;

[0018] The directional drill enters the tunnel face or external rock mass, and its trajectory is monitored by the directional drill core bit tracking device; the core bit is used to drill according to the predetermined trajectory;

[0019] If deflection is required during the drilling process, first the rigid connection between the corresponding petal-shaped slider and the adjacent slider slides out, and the cylindrical block protrusion under the corresponding petal-shaped slider is controlled according to the set trajectory to cause the petal-shaped slider to produce a certain angle displacement, and the contact pressure between the petal-shaped slider and the borehole wall causes the directional drill to tilt in the opposite direction to produce a certain inclination angle;

[0020] When drilling to the coring position, the coring drill bit performs coring, and the inner wall of the hollow inner screw of the straight spiral slide connected to the coring drill bit is tightly connected to the core. After being in close contact with the rear of the core by pressurization, the gas-liquid-electric coupled power screw motor drives the outer drill rod of the straight spiral slide rod to rotate, passively driving the hollow inner screw and its fixed core to produce axial displacement along the inner wall thread of the external drill rod, thereby realizing the removal of the core.

[0021] According to some embodiments, the present disclosure adopts the following technical solutions:

[0022] A computer program product comprises a computer program, wherein when the computer program is executed by a processor, the full-hole coring method of a directional drilling hollow rotary guide coring drill tool is implemented.

[0023] According to some embodiments, the present disclosure adopts the following technical solutions:

[0024] A non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, a full-hole coring method of a directional drilling hollow rotary guide coring drill tool is implemented.

[0025] According to some embodiments, the present disclosure adopts the following technical solutions:

[0026] An electronic device comprises: a processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory so that the electronic device executes the full-hole coring method of a directional drilling hollow rotary guide coring drill tool.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The hollow rotary guide coring drill bit for directional drilling disclosed in the present invention utilizes the characteristic of the straight spiral slide rod rotating forward (backward), simplifies the mechanical structure of the traditional coring equipment, and improves the continuity of drilling and removing the core, so as to realize rapid coring, and provides a new idea and method for directional drilling coring.

[0029] The disclosed hollow rotary guide coring drill tool for directional drilling innovatively utilizes the local deformation of the integrated equipment to realize all-round and arbitrary angle directional drilling during the drilling process. Compared with the traditional deflection method such as deflection by screw motor, the disclosed tool fully utilizes the gap difference between the coring drill bit, the external drill rod and the hole wall. The deflection component is smaller in size and more flexible in deflection, which can improve the accuracy of the trajectory of the drilling process and the quality of coring.

[0030] The present invention discloses a directional drilling hollow rotary guide coring drill, wherein the hollow rotary guide drill is a curvature-free device, and based on the directional deflection technology and core extraction technology proposed above, the coring operation under the normal working condition of the drilling equipment can be realized. Compared with the existing directional drilling coring equipment, continuous coring can be realized during directional drilling, and kilometer-level directional full-hole coring can be realized in deep tunnels and large-scale projects, which makes up for the technical gap in the fields of tunnel engineering and mining engineering to a certain extent.

[0031] The present invention discloses a directional drilling hollow rotary guide coring drill which is a curvature-free, hollow drill. The diameter of the water-passing joint and the water delivery pipeline is smaller than the inner diameter of the straight spiral slide rod, and the water-passing equipment can be transported along the inside of the straight spiral slide rod to the required position to maintain the water pressure of the flushing fluid. The pipeline and the joint are pushed forward along the curvature-free drill by external power. The remote controllable delivery of the water-passing joint can be realized in the hollow rotary drill. The water-passing joint is connected to the water pipeline, and the flushing fluid is pumped into the drill from the water pipeline through external pumping, so as to ensure the stability of the hole wall and prevent the drill from getting stuck. The flushing fluid can be delivered during the kilometer-level drilling process, reducing the risk of getting stuck, ensuring the stability of the hole wall, and improving the controllability of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0033] Figure 1 It is a schematic diagram of the overall structure of a kilometer-level directional drilling hollow rotary guide coring drill according to an embodiment of the present disclosure;

[0034] Figure 2 is a schematic axial cross-sectional view of an external drill rod string according to an embodiment of the present disclosure;

[0035] Figure 3 A schematic diagram of the threads of the outer column of the straight spiral slide rod of the embodiment of the present disclosure;

[0036] Figure 4 It is a schematic cross-sectional view of the outer column of the straight spiral sliding rod of the embodiment of the present disclosure;

[0037] Figure 5 This is a schematic diagram of coring the hollow inner screw in an embodiment of the present disclosure;

[0038] Figure 6 A schematic diagram of a petal-shaped slider according to an embodiment of the present disclosure;

[0039] Figure 7 A schematic diagram of the deflection of a petal-shaped slider according to an embodiment of the present disclosure;

[0040] Figure 8 This is a flow chart of a full-hole coring method for 1,000-meter directional drilling according to an embodiment of the present disclosure;

[0041] Fig. 9 It is a schematic diagram of a core holding device according to an embodiment of the present disclosure;

[0042] Among them, 1. coring drill bit, 2. petal-shaped slider, 3. external drill rod, 4. straight spiral slide rod, 5. slide rod outer column, 6. hollow inner screw rod, 7. far drill bit end, 8. threaded groove, 9. core, 10. core holding device, 11. cylindrical block. DETAILED DESCRIPTION

[0043] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] Example 1

[0047] In one embodiment of the present disclosure, a directional drilling hollow rotary guide coring drill is provided, such as Figure 1 , Figure 3 as well as Figure 4 As shown, it includes an external drill rod 3 and a coring drill bit 1, the external drill rod 3 has a built-in straight spiral slide rod 4, the straight spiral slide rod includes a slide rod outer column 5 and a hollow inner screw 6, the outer wall of the slide rod outer column 5 is smooth, the inner wall of the slide rod outer column 5 is provided with a thread groove 8, the outer wall of the hollow inner screw 6 is provided with a thread protrusion, the outer wall of the hollow inner screw 6 is threadedly connected with the inner wall of the slide rod outer column 5, and the hollow inner screw 6 can generate axial displacement in the drilling direction along the thread track provided by the thread groove 8 of the slide rod outer column;

[0048] The coring drill bit 1 is connected to the straight spiral slide rod 4. The coring drill bit and the straight spiral slide rod are rigidly connected, which can be understood as welding or being tightly connected by bolts. The outer wall of the slide rod outer column 5 is fixedly connected to the inner wall of the external drill rod 3. The external drill rod 3 is connected to a gas-liquid-electric coupled power screw motor. The gas-liquid-electric coupled power screw motor drives the slide rod outer column connected to the inner wall of the external drill rod to rotate, thereby driving the hollow inner screw to rotate in the opposite direction, generating axial displacement along the threaded track, thereby driving the coring drill bit to perform directional coring.

[0049] The thread groove on the inner wall of the slide rod outer column 5 and the thread protrusion on the outer wall of the hollow inner screw rod 6 are both arranged in an arc shape to reduce the friction between the various parts of the slide rod.

[0050] As an embodiment, the straight spiral slide rod 4 is composed of two parts: the slide rod outer column 5 and the hollow inner screw 6: the inner side of the slide rod outer column 5 is in the shape of a threaded groove, and the hollow inner screw 6 is in the shape of a threaded protrusion and fits tightly with the groove of the inner wall of the slide rod column. The threaded protrusion can produce axial displacement in the drilling direction along the track provided by the outer column groove; secondly, the threaded design of the straight spiral slide rod 4 is arc-shaped, which reduces the friction between the various parts of the slide rod, plays a good lubrication role, effectively alleviates the problems of rapid wear of the drill tool, and increases the average life of the drill tool. The slide rod outer column barrel wall of the straight spiral slide rod 4 at the far drill bit end 7 is rigidly connected to the external drill rod 3, and the external drill rod 3 is rear-mounted with a gas-liquid-electric coupled power screw motor. The rear end of the external drill rod 3 is connected to the gas-liquid-electric coupled power screw motor to form an active device, and the hollow screw of the straight spiral slide rod 4 is a driven device. On the outer column wall of the straight spiral slide 4, elastic protrusions are set at both ends of the threaded track to prevent the screw from sliding out due to excessive rotation speed, so as to realize the controllable displacement of the straight spiral slide. The straight spiral slide part described in the present invention drives the outer column 5 of the straight spiral slide to rotate through the rotation of the screw motor, thereby driving the hollow inner screw 6 to rotate in the opposite direction, and generating axial controllable displacement along the threaded track. A signal transmitter is built into the inner screw of the straight spiral slide near the drill bit end, which can transmit a signal to realize the positioning of the core during the coring process.

[0051] like Figure 1 , Figure 6 as well as Figure 7 As shown, the inner size of the core drill bit 1 is larger than the external drill rod 3, and a four-equally divided petal-shaped slider 2 is designed at a certain distance from the drill rod where it is connected to the core drill bit 1. The outer wall of the petal-shaped slider 2 is convex, and the inner wall fits tightly with the internal straight spiral slide rod 4. During the linear drilling process, the diameter of the convex part is smaller than the diameter of the core drill bit 1.

[0052] The flap-shaped slider 2 is connected to the external drill rod 3 by a one-way bearing, which generates an angular displacement perpendicular to the drilling direction. At the contact point with the flap-shaped slider 2, an active hydraulic deflection device is provided on the outer side of the outer wall of the straight spiral slider 4. The active hydraulic deflection device is composed of a cylindrical block 11, which is densely and evenly distributed in the contact part. The displacement of the cylindrical block 11 pushes the external flap-shaped slider 2 to passively displace. After the displacement, the diameter of the flap-shaped slider 2 increases, and the slider collides with the inner wall of the borehole to realize the directional controllable directional deflection during the directional drilling process. A pressure sensor is provided at the protrusion of the flap-shaped slider 2. The external pressure sensor of the flap-shaped slider can monitor the pressure between the outer wall of the flap-shaped slider and the wall of the borehole, and its functions are as follows:

[0053] 1. By monitoring the pressure between the two, according to the material of the drilling tool, the drilling tool is ensured not to be damaged during the deflection process;

[0054] 2. Ensure the stability of the borehole wall according to the pressure provided to prevent the collapse of the borehole wall;

[0055] 3. Use this pressure to determine the water pressure that the flushing fluid should provide and adjust the position of the water joint.

[0056] As an embodiment, the size of the directional drilling coring drill bit 1 is slightly larger than the outermost external drill rod 3, so that there is a certain distance between the external drill rod 3 and the circumference of the borehole, providing movable space for creating inclination during drilling; secondly, the drill rod column 15cm-20cm at the connection with the coring drill bit 1 is designed with a four-equal petal-shaped slider, the outer wall of the petal-shaped slider is convex, and the inner wall fits tightly with the internal straight spiral slide rod. During linear drilling, the diameter of the convex part is smaller than the diameter of the coring drill bit. The petal-shaped slider is connected to the rear external drill rod by a one-way bearing, which can produce angular displacement perpendicular to the drilling direction;

[0057] An active hydraulic deflection device is provided on the outer side of the outer wall of the straight spiral slide rod at the contact point with the petal-shaped slider. The active hydraulic deflection device is composed of a protruding cylindrical block, which is densely and evenly distributed in the contact part. A signal receiving device is provided in the block, which can remotely control the size and range of the protrusion of the cylindrical block. The displacement of the cylindrical block pushes the external petal-shaped slider to passively displace. After the displacement, the diameter of the petal-shaped slider part increases, and the slider collides with the inner wall of the borehole to realize the full-directional controllable directional deflection during the directional drilling process. A pressure sensor is provided at the protrusion of the petal-shaped slider. According to the actual engineering situation, a signal is emitted after the pressure reaches the rated value, and the displacement of the cylindrical block is stopped by the remote control station. A probe or signal transmitter is provided in the coring drill bit, and directional deflection is realized through signal emission to determine the fit between the actual trajectory and the designed trajectory during the coring process. The main material of the petal-shaped slider is a new lightweight and high-strength drill pipe material Cf / Al (i.e., aluminum alloy material), and the overall strength is higher than the rock mass. The strength design refers to existing research and meets the requirements of the ultimate bending strength of the overall rotation radius of the drill pipe. During straight-line drilling, the side walls of each petal-shaped slider are rigidly connected via an insertable slider, and together with the drill pipe form a partially detachable integrated directional drilling coring equipment.

[0058] like Figure 2 , Figure 3 , Figure 5 , Fig. 9As shown, the interior of the hollow inner screw 6 is hollow, and a core holding device 10 is arranged near the drill bit on the inner wall of the straight spiral slide rod 4. The core holding device 10 is a slider with a raised inner wall, and the contact part between the slider and the core is rough. When the core is taken out to the holding device, the slider is controlled by remote operation to slide out and contact the core and pressurize to generate friction, so as to achieve the connection between the core and the inner wall of the straight spiral slide rod. After the core is completely taken out, the screw motor drives the inner barrel of the straight spiral slide rod and the core to slide out, so as to achieve coring. A pressurizing device is arranged inside the hollow inner screw 6, and the pressurizing device can generate displacement along the diameter direction of the drill tool, and fully utilize the friction force by pressurization to achieve a close connection with the core 9, so that the taken core and the straight spiral slide rod produce the same displacement effect. The interior of the straight spiral slide rod is hollow, and the synchronous displacement of the hollow inner screw and the core is achieved by pressurizing and fixing the core with the core after coring by the coring drill bit.

[0059] As an embodiment, the interior of the straight spiral slide rod 4 is hollow, the front of the straight spiral slide rod 4 is connected to the coring drill bit 1, and a pressure device is provided inside the hollow inner screw 6 of the straight spiral slide rod 4. The pressure device can produce displacement along the diameter direction of the drill tool, and fully utilize the friction force by pressurization to achieve a close connection with the core 9, so that the taken core and the straight spiral slide rod 4 produce the same displacement effect. The pressure device at the front end of the straight spiral slide rod 4 can be controlled by remote control, and the pressurization and pressure relief during the core transportation process can be freely realized to achieve the uniform displacement of the hollow inner screw 6 and the core 9. Secondly, the proposed coring drill tools are all straight rods without curvature and are hollow. Continuous coring during the drilling process can be achieved through the straight spiral slide rod. At the same time, the proposed external drill rod can realize the transmission of equipment such as built-in water-through joints. Through specific equipment during long-distance drilling, the risk of drill jamming is reduced, the stability of the hole wall is ensured, or the smooth transportation of the core is ensured. The drilling rig monitoring and control system can receive and monitor the drilling rig operating parameters and drilling process parameters at any time, and can always ensure that drilling construction is carried out under the optimal parameter conditions.

[0060] like Figure 5 As shown, the interior of the straight spiral slide rod 4 is hollow, and the synchronous displacement of the internal screw and the core can be achieved by pressurizing and fixing the core 9 after coring by the coring drill bit 1. The rear screw motor drives the core to be transported quickly through the straight spiral slide rod device to achieve coring.

[0061] like Figure 7 As shown, when there is a need for deflection, the cylindrical protrusion on the outer wall of the slide rod is remotely controlled to move a certain distance, and the petal-shaped slide block protrusion is controlled to contact with the borehole wall to achieve the purpose of deflection.

[0062] Example 2

[0063] In one embodiment of the present disclosure, a full-hole coring method for a directional drilling hollow rotary directional coring drill is provided. In existing research, the ultimate bending strength of the borehole body of the drill pipe for safe operation in a curved borehole has been studied. When the drill tool is drilling in a curved section, the drill pipe is subjected to compression, torsion and bending loads, and the bending load is composed of the superposition of "passive" and "active" parts. The "passive" part is the bending load caused by the drill pipe being forced by the curved borehole, and the "active" part is the bending load caused by the axial pressure and torque transmitted by the drill pipe. During the drilling process, the drill pipe generates bending deformation under the state of bending moment and performs rotational motion around its own axis. The stress in the drill pipe has an asymmetric cyclic alternating characteristic. The study ensures the ultimate bending strength of the borehole body of the drill pipe for safe operation in a curved borehole by performing fatigue calculation on the drill pipe working under alternating stress:

[0064] The bending stress generated by the drill pipe due to the bending of the drilling hole is:

[0065] M—bending moment, W—drill pipe bending section coefficient, E—elastic modulus of steel drill pipe, R0—curvature radius of the curved borehole, d—drill pipe outer diameter, i—bending strength of the borehole

[0066] Bending stress caused by pressure and torque transmitted by drill pipe:

[0067] D k —borehole diameter, d—drill pipe outer diameter, l—minimum half-wave length of drill pipe bending (its value can be solved by TM Sarkisov formula)

[0068] The total bending stress on the drill pipe can be obtained by the superposition principle:

[0069] Stress amplitude in drill pipe under asymmetric cycle:

[0070] σ -1 —The endurance limit of drill pipe material bending under symmetrical cycles, K σ —Effective stress concentration factor reflecting the influence of component shape (obtained by looking up the table), ψ σ —Material sensitivity coefficient to asymmetric stress cycle, ε σ —Size coefficient reflecting the influence of component size, β—Surface quality coefficient reflecting the influence of component surface quality.

[0071] For steel drill pipes made of plastic materials, the third and fourth strength theories can be used to establish strength conditions, and the bending stress in the drill pipe shall not exceed the stress amplitude σ in its stress cycle. a , it can be seen that the ultimate bending strength of the drill pipe string in the safe working hole with curvature is:

[0072]

[0073] Furthermore, the present invention discloses a full-hole coring method for a kilometer-level directional drilling hollow rotary guide coring drill, comprising:

[0074] Get the set drilling trajectory;

[0075] The directional drill enters the tunnel face or external rock mass, and its trajectory is monitored by the directional drill core bit tracking device; the core bit is used to drill according to the predetermined trajectory;

[0076] If deflection is required during the drilling process, first the rigid connection between the corresponding petal-shaped slider and the adjacent slider slides out, and the cylindrical block protrusion under the corresponding petal-shaped slider is controlled according to the set trajectory to cause the petal-shaped slider to produce a certain angle displacement, and the contact pressure between the petal-shaped slider and the borehole wall causes the directional drill to tilt in the opposite direction to produce a certain inclination angle;

[0077] When drilling to the coring position, the coring drill bit performs coring, and the inner wall of the hollow inner screw of the straight spiral slide connected to the coring drill bit is tightly connected to the core. After being in close contact with the rear of the core by pressurization, the gas-liquid-electric coupled power screw motor drives the outer drill rod of the straight spiral slide rod to rotate, passively driving the hollow inner screw and its fixed core to produce axial displacement along the inner wall thread of the outer drill rod, thereby realizing the removal of the core.

[0078] As an embodiment, the specific implementation process of the disclosed method is as follows:

[0079] Step 1: Design the drilling trajectory according to the actual situation or requirements of the project.

[0080] Step 2: The directional drill enters the tunnel face or external rock mass. The trajectory of the directional drill can be monitored by the coring drill bit tracking device; the coring drill bit is used to drill according to the predetermined trajectory.

[0081] Step 3: If deflection is required during drilling, the omnidirectional slider directional deflection device is controlled by the remote control station. First, the rigid connector between the corresponding petal-shaped slider and the adjacent slider slides out, and the cylindrical block protrusion under the corresponding petal-shaped slider is controlled according to the set trajectory to make the petal-shaped slider produce a certain angle displacement, and the contact pressure between the petal-shaped slider and the borehole wall is generated to make the directional drill tilt in the opposite direction to produce a certain inclination angle, thereby achieving the deflection effect.

[0082] Step 4: Pass flushing fluid through the hole and drill pipe to reduce the risk of drill sticking and maintain the stability of the borehole.

[0083] Step 5: When drilling to the coring position, the coring drill bit performs coring. The inner wall of the inner cylinder of the straight spiral slide rod connected to the coring drill bit is tightly connected to the core. After being in close contact with the rear of the core by pressurization, the screw motor drives the outer column of the slide rod to rotate, and the hollow inner screw of the passive device and its fixed core are axially displaced along the outer column thread of the slide rod to achieve the removal of the core.

[0084] Step 6: The core is taken out along the hollow drill pipe and transported to the outside.

[0085] Step 7: After the previous core is successfully cored, the coring drill bit continues to drill during the transportation process and reaches the next coring position according to step 3.

[0086] Step 8: Repeat steps 4 and 5 until coring is completed to achieve continuous coring of the rock mass.

[0087] Step 9: Remotely control the drill pipe to be retracted.

[0088] Example 3

[0089] In one embodiment of the present disclosure, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the full-hole coring method of a directional drilling hollow rotary guide coring drill tool is implemented.

[0090] Example 4

[0091] In one embodiment of the present disclosure, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the full-hole coring method of a directional drilling hollow rotary guide coring drill tool is implemented.

[0092] Example 5

[0093] An electronic device comprises: a processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory so that the electronic device executes the full-hole coring method of a kilometer-level directional drilling hollow rotary guide coring drill tool.

[0094] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0096] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A directional drilling hollow rotary guide coring drill, characterized in that: It comprises an external drill rod and a coring drill bit, the external drill rod has a built-in straight spiral slide rod, the straight spiral slide rod comprises a slide rod outer column and a hollow inner screw rod, the outer wall of the slide rod outer column is smooth, the inner wall of the slide rod outer column is provided with a thread groove, the outer wall of the hollow inner screw rod is provided with a thread protrusion, the outer wall of the hollow inner screw rod is threadedly connected with the inner wall of the slide rod outer column, and the hollow inner screw rod can generate axial displacement in the drilling direction along the thread track provided by the thread groove of the slide rod outer column; The coring drill bit is connected to the straight spiral slide rod, the outer wall of the slide rod outer column is fixedly connected to the inner wall of the external drill rod, the external drill rod is connected to a gas-liquid-electric coupled power screw motor, the gas-liquid-electric coupled power screw motor drives the slide rod outer column connected to the inner wall of the external drill rod to rotate, thereby driving the hollow inner screw to rotate in the opposite direction, generating axial displacement along the threaded track, thereby driving the coring drill bit to perform directional coring.

2. A directional drilling hollow rotary guide coring drill according to claim 1, characterized in that: The inner size of the core drill bit is larger than the external drill rod, and a four-divided petal-shaped slider is designed at a certain distance from the drill rod where it is connected to the core drill bit. The outer wall of the petal-shaped slider is convex, and the inner wall fits tightly with the internal straight spiral slide rod. During linear drilling, the diameter of the convex part is smaller than the diameter of the core drill bit.

3. A directional drilling hollow rotary guide coring drill according to claim 2, characterized in that: The petal-shaped slider is connected to the external drill rod by a one-way bearing, which produces an angular displacement perpendicular to the drilling direction. At the contact point with the petal-shaped slider, an active hydraulic deflection device is provided on the outer side of the outer wall of the straight spiral slider. The active hydraulic deflection device is composed of a cylindrical block, which is densely and evenly distributed in the contact part. The displacement of the cylindrical block pushes the external petal-shaped slider to passively displace. After the displacement occurs, the diameter of the petal-shaped slider part increases, and the slider collides with the inner wall of the borehole to realize all-directional controllable directional deflection during directional drilling. A pressure sensor is provided at the protrusion of the petal-shaped slider.

4. A directional drilling hollow rotary guide coring drill according to claim 1, characterized in that: The interior of the hollow inner screw is hollow, and a pressurizing device is provided inside the hollow inner screw. The pressurizing device can generate displacement along the diameter direction of the drill bit, and fully utilize the friction force through pressurization to achieve a close connection with the core, so that the taken core and the straight spiral slide rod produce the same displacement effect.

5. A directional drilling hollow rotary guide coring drill according to claim 1, characterized in that: The thread groove on the inner wall of the outer column of the sliding rod and the thread protrusion on the outer wall of the hollow inner screw rod are both arranged in an arc shape to reduce the friction between the parts of the sliding rod.

6. A directional drilling hollow rotary guide coring drill according to claim 1, characterized in that: The interior of the straight spiral slide rod is designed to be hollow, and synchronous displacement of the hollow inner screw rod and the core is achieved by pressurizing and fixing the core with the core drill bit after coring.

7. A full-hole coring method for a directional drilling hollow rotary guide coring drill according to any one of claims 1 to 6, characterized in that: include: Get the set drilling trajectory; The directional drill enters the tunnel face or external rock mass, and its trajectory is monitored by the directional drill core bit tracking device; the core bit is used to drill according to the predetermined trajectory; If deflection is required during the drilling process, first the rigid connection between the corresponding petal-shaped slider and the adjacent slider slides out, and the cylindrical block protrusion under the corresponding petal-shaped slider is controlled according to the set trajectory to cause the petal-shaped slider to produce a certain angle displacement, and the contact pressure between the petal-shaped slider and the borehole wall causes the directional drill to tilt in the opposite direction to produce a certain inclination angle; When drilling to the coring position, the coring drill bit performs coring, and the inner wall of the hollow inner screw of the straight spiral slide rod connected to the coring drill bit is tightly connected to the core. After being in close contact with the rear of the core by pressurization, the gas-liquid-electric coupled power screw motor drives the slide rod outer column of the straight spiral slide rod to rotate, passively driving the hollow inner screw rod and its fixed core to produce axial displacement along the inner wall thread of the external drill rod, thereby realizing the removal of the core.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by the processor, the full-hole coring method of a directional drilling hollow rotary guide coring drill tool as described in claim 7 is implemented.

9. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by the processor, the full-hole coring method of a directional drilling hollow rotary guide coring drill tool as described in claim 7 is implemented.

10. An electronic device, characterized in that: include: A processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to execute the full-hole coring method of a directional drilling hollow rotary guide coring drill as described in claim 7.

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