A directional drilling hollow rotary steerable coring drill and a full hole coring method

Abstract

The present disclosure provides a directional drilling hollow rotary steerable coring drill and a full-hole coring method, relates to the fields of geotechnical engineering mechanics and drilling technology, and comprises an external drill rod and a coring drill bit. The external drill rod is internally provided with a straight helical slide rod. The straight helical 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, and the inner wall of the slide rod outer column is provided with a threaded groove. The outer wall of the hollow inner screw rod is provided with a threaded protrusion, so that the hollow inner screw rod can produce axial displacement in the drilling direction along the threaded track provided by the threaded groove of the slide rod outer column. The coring drill bit is connected with the straight helical slide rod, the outer wall of the slide rod outer column is fixedly connected with the inner wall of the external drill rod, the external drill rod is connected with a gas-liquid-electric coupling power screw motor, the gas-liquid-electric coupling power screw motor drives the slide rod outer column connected with the inner wall of the external drill rod to rotate, thereby driving the hollow inner screw rod to rotate in the opposite direction, producing axial displacement along the threaded track, and thereby driving the coring drill bit to carry out directional coring.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of geotechnical engineering mechanics and drilling technology, in particular to a directional drilling hollow rotary steerable coring drill and a full-hole coring method. BACKGROUND

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

[0003] Directional coring drilling intuitively and accurately understands the adverse geological conditions in front of the tunnel face through borehole testing technology, thereby accurately dividing the lithology change of the tunnel design axis surrounding rock, the distribution range of the broken zone and the tunnel gushing water condition, and realizing the tunnel surrounding rock geological prediction. Directional coring drilling technology includes drilling, steering, coring, and measurement while drilling.

[0004] The directional drilling steering drilling method mainly uses the asymmetric drill bit bevel reaction force to change the drilling direction and adjust the incident angle of the drill bit to achieve the purpose of building an angle, but the drill required by this angle building method has curvature, and only coring can be achieved. In long distance (such as kilometer level) directional drilling engineering, the coring operability is low. In the existing research, the hole body limit bending strength of the drill pipe working safely in the curved borehole is studied. When the drill pipe drills in the curved section, the drill pipe bears compression, torsion and bending load, and the bending load is superimposed by "passive" and "active" parts. The "passive" part is the bending load generated by the drill pipe under the stress of the curved borehole, and the "active" part is the bending load generated by the drill pipe transmitting axial pressure and torque. The drill pipe produces bending deformation and rotates around its own axis under the bending moment state in the drilling process, and the stress in the drill pipe has the characteristics of asymmetric cyclic alternation. The research ensures the hole body limit bending strength of the drill pipe working safely in the curved borehole by calculating the fatigue of the drill pipe working under alternating stress; in the field of geotechnical engineering, obtaining rock core and its mechanical parameters through coring drill bit is an effective means to solve the rock occurrence or ground stress. Compared with the conventional method, it can reduce the drilling workload, speed up the exploration speed, reduce the exploration cost, improve the test conditions and improve the accuracy, and has obvious advantages.

[0005] At present, the method of directional drilling coring is mostly limited to coring, in addition, the wireline coring method can realize drilling coring under the condition of not pulling out the drill or pulling out the drill rarely by using the method of fishing the core with a steel wire rope, but there is still a technical and equipment gap in long distance drilling full-hole coring. In the face of the problems of difficult fast drilling and difficult directional drilling control, how to quickly and accurately take out high-quality rock cores in rock mass is the key of directional coring equipment and the primary problem to be overcome in directional drilling coring at present. SUMMARY

[0006] The present disclosure proposes a directional drilling hollow rotary steerable coring drill and a full-hole coring method to solve the above problems, which combines coring with directional drilling technology, proposes a hollow directional coring drill based on a straight helical slide rod, fully utilizes the designed screw trajectory in the drill and the space in the hollow thin-walled drill to realize rapid rotation coring during drilling, and proposes a straight rod directional build-up 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 steerable coring drill includes an external drill rod and a coring drill bit, the external drill rod is internally provided with a straight helical slide rod, the straight helical slide rod includes 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 threaded groove, the outer wall of the hollow inner screw rod is provided with a threaded 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 be axially displaced along the threaded track provided by the threaded groove of the slide rod outer column in the drilling direction;

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

[0010] Further, the inner size of the coring drill bit is greater than that of the external drill rod, the drill rod at a certain distance from the junction with the coring drill bit is designed as a four-equal-part petal-shaped slide block, the outer wall of the petal-shaped slide block is protruding, the inner wall is tightly fitted with the internal straight helical slide rod, and the protruding part has a diameter smaller than that of the coring drill bit during straight-line drilling.

[0011] Further, the petal-shaped slide block is connected with the external drill rod by a one-way bearing to produce angular displacement perpendicular to the drilling direction, a driven hydraulic build-up device is arranged on the outer side of the outer wall of the straight helical slide rod at the contact part with the petal-shaped slide block, the driven hydraulic build-up device is composed of cylindrical blocks, which are densely and uniformly distributed at the contact part and are produced by displacement of the cylindrical blocks, to push the external petal-shaped slide block to passively produce displacement, the diameter of the petal-shaped slide block is increased after displacement, the slide block collides with the inner wall of the borehole to realize full-direction controllable directional build-up during directional drilling, and a pressure sensor is arranged at the protruding part of the petal-shaped slide block.

[0012] Further, the hollow inner screw rod is internally hollow, the hollow inner screw rod is provided with a pressurizing device, the pressurizing device can produce displacement along the diameter direction of the drill, and the pressurizing device fully utilizes the friction force to realize tight connection with the core, so that the taken core and the straight helical slide rod produce the same displacement effect.

[0013] Further, the thread groove of the outer wall of the outer column of the slide rod and the thread projection of the hollow inner screw rod are arranged in an arc shape to reduce the friction between the parts of the slide rod.

[0014] Further, the straight helical slide rod is hollow, and the synchronous displacement of the hollow inner screw rod and the core is realized through the coring by the core drill and the pressurized fixing of the core.

[0015] According to some embodiments, the present disclosure adopts the technical scheme as follows:

[0016] A full-hole coring method of a hollow rotary steerable coring drill in directional drilling includes:

[0017] Obtaining a set drilling trajectory;

[0018] The directional drilling is drilled into the tunnel face or external rock mass, and the trajectory is monitored by a directional drilling coring bit tracking device; drilling is performed according to the predetermined trajectory by the rotary cutting of the coring bit.

[0019] If deviation is needed during drilling, first, the rigid connecting body between the corresponding petal-shaped slide block and the adjacent slide block is slid out, the corresponding petal-shaped slide block is controlled to produce a certain angular displacement by controlling the cylindrical block protrusion under the corresponding petal-shaped slide block according to the set trajectory, and the directional drilling is tilted in the opposite direction to produce a certain tilt angle by the contact pressure between the petal-shaped slide block and the borehole wall.

[0020] When drilling to the coring position, the coring bit is cored, the hollow inner screw rod of the straight helical slide rod connected to the coring bit is in close contact with the core, and the hollow inner screw rod is in close contact with the rear part of the core through pressurization, then the gas-liquid-electric coupling power screw motor drives the outer drill rod of the straight helical slide rod to rotate, passively drives the hollow inner screw rod and the fixed core to produce axial displacement along the inner wall thread of the outer drill rod, and the core is taken out.

[0021] According to some embodiments, the present disclosure adopts the technical scheme as follows:

[0022] A computer program product includes a computer program, which, when executed by a processor, implements the full-hole coring method of the hollow rotary steerable coring drill in directional drilling.

[0023] According to some embodiments, the present disclosure adopts the technical scheme as follows:

[0024] A non-transitory computer-readable storage medium is used to store computer instructions, which, when executed by a processor, implement the full-hole coring method of the hollow rotary steerable coring drill in directional drilling.

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

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

[0027] Compared with the prior art, the present disclosure has the beneficial effects that:

[0028] The directional drilling hollow rotary steerable coring drill of the present disclosure utilizes the characteristics of straight helical slide rod rotation and advancement (retreat), simplifies the mechanical structure on the basis of traditional coring equipment, improves the continuity of drilling and core extraction, and can realize rapid coring, thereby providing a new idea and method for directional drilling coring.

[0029] The directional drilling hollow rotary steerable coring drill of the present disclosure innovatively utilizes the local deformation of integrated equipment to realize omnidirectional directional drilling at any angle during drilling. Compared with the traditional build-up method through screw motor, the present disclosure fully utilizes the gap difference between the coring bit, the external drill rod and the hole wall, the build-up component has a smaller volume, the build-up is more flexible, the accuracy of the drilling trajectory during drilling can be improved, and the coring quality can be improved.

[0030] The directional drilling hollow rotary steerable coring drill of the present disclosure is a non-curvature equipment, based on the above-mentioned directional build-up technology and core extraction technology, the coring operation under the normal working condition of the drilling equipment can be realized. Compared with the existing directional drilling coring equipment, the present disclosure can realize continuous coring during directional drilling, can realize kilometer-level directional full-hole coring in deep tunnels and large-volume projects, and to some extent, makes up for the technical gap in the fields of tunnel engineering and mining engineering.

[0031] The directional drilling hollow rotary steerable coring drill of the present disclosure is a non-curvature and hollow drill. The water passage joint and the water pipeline have a smaller diameter than the inner diameter of the straight helical slide rod, the water passage equipment can be transported along the inside of the straight helical slide rod to the required position to maintain the water pressure of the flushing liquid. The joint and the pipeline are driven by an external power source to advance along the non-curvature drill. Remote controllable transportation of the water passage joint can be realized in the hollow rotary drill, the water passage joint is connected with the water pipeline, the flushing liquid is pumped into the drill through the water pipeline by an external pump, the stability of the hole wall is ensured, and the risk of sticking is reduced, the stability of the hole wall is ensured, and the controllability of the project is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the present disclosure, illustrate preferred embodiments of the present disclosure, and to explain the principles of the present disclosure. The drawings are not intended to limit the present disclosure.

[0033] Figure 1 The overall structure schematic diagram of the kilometer directional drilling hollow rotary steerable coring drill of the embodiment of the present disclosure;

[0034] Figure 2 The axial section schematic diagram of the external drill rod column of the embodiment of the present disclosure;

[0035] Figure 3 The thread schematic diagram of the slide rod outer column of the straight helix slide rod of the embodiment of the present disclosure;

[0036] Figure 4 The slide rod outer column section schematic diagram of the straight helix slide rod of the embodiment of the present disclosure;

[0037] Figure 5 The hollow inner screw coring schematic diagram of the embodiment of the present disclosure;

[0038] Figure 6 The petal-shaped slide block schematic diagram of the embodiment of the present disclosure;

[0039] Figure 7 The petal-shaped slide block build angle schematic diagram of the embodiment of the present disclosure;

[0040] Figure 8 The kilometer directional drilling full hole coring method flow chart of the embodiment of the present disclosure;

[0041] Figure 9 The core holding device schematic diagram of the embodiment of the present disclosure;

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

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

[0044] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs.

[0045] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components, and / or combinations thereof.

[0046] Embodiment 1

[0047] In one embodiment of the present disclosure, a directional drilling hollow rotary steerable coring drill is provided, as shown in Figure 1 , Figure 3 and Figure 4 , comprising an outer drill pipe 3 and a coring drill bit 1, the outer drill pipe 3 is built-in with a straight helical slide rod 4, the straight helical slide rod comprises a slide rod outer column 5 and a hollow inner screw rod 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 threaded groove 8, the outer wall of the hollow inner screw rod 6 is provided with a threaded protrusion, the outer wall of the hollow inner screw rod 6 is in threaded connection with the inner wall of the slide rod outer column 5, and the hollow inner screw rod 6 can be axially displaced in the drilling direction along the threaded track provided by the threaded groove 8 of the slide rod outer column;

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

[0049] The threaded groove of the inner wall of the slide rod outer column 5 and the threaded protrusion of the outer wall of the hollow inner screw rod 6 are both provided in an arc shape, so as to reduce the friction between the parts of the slide rod.

[0050] As an embodiment, the straight helical slide rod 4 is composed of two parts: the slide rod outer column 5 and the hollow inner screw rod 6. The inner side of the slide rod outer column 5 is in the form of a threaded groove, and the hollow inner screw rod 6 is in the form of a threaded protrusion and is tightly fitted with the groove in the inner wall of the outer 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 helical slide rod 4 is in the form of an arc, which reduces the friction between the parts of the slide rod, plays a good lubricating role, effectively alleviates the problem of fast wear of the drilling tool, and improves the average service life of the drilling tool. The slide rod outer column cylinder wall of the straight helical slide rod 4 at the far end of the drill bit 7 is rigidly connected with the external drill rod 3. The external drill rod 3 is provided with a gas-liquid-electric coupling power screw motor at the rear end. The rear end of the external drill rod 3 is connected with the gas-liquid-electric coupling power screw motor to form a driving device, and the hollow screw rod of the straight helical slide rod 4 is a driven device. Elastic protrusions are arranged at both ends of the threaded track on the slide rod outer column cylinder wall of the straight helical slide rod 4 to prevent the screw rod from sliding out due to excessive speed and to realize the controllability of the displacement of the straight helical slide rod. The straight helical slide rod part of the present disclosure is rotated by the screw motor to drive the slide rod outer column 5 of the straight helical slide rod to rotate, thereby driving the hollow inner screw rod 6 to rotate in the opposite direction and producing axial controllable displacement along the threaded track. The inner screw rod of the straight helical slide rod is provided with a signal transmitter at the near drill bit end, which can emit signals to realize the positioning of the core during coring.

[0051] As shown in Figure 1 , Figure 6 and Figure 7 , the inner size of the coring drill bit 1 is greater than the external drill rod 3, and the drill rod at a certain distance from the junction with the coring drill bit 1 is designed in the form of a four-equal-part petal-shaped slide block 2. The outer wall of the petal-shaped slide block 2 is in the form of a protrusion, and the inner wall is tightly fitted with the internal straight helical slide rod 4. The diameter of the protruding part is smaller than the diameter of the coring drill bit 1 during straight-line drilling.

[0052] The petal-shaped slide block 2 is connected with the external drill rod 3 by a one-way bearing to produce angular displacement perpendicular to the drilling direction. The outer wall of the outer wall of the straight helical slide rod 4 is provided with a driving hydraulic deviation device at the contact part with the petal-shaped slide block 2. The driving hydraulic deviation device is composed of a cylindrical block 11, which is densely and uniformly distributed at the contact part and is produced by the displacement of the cylindrical block 11 to drive the external petal-shaped slide block 2 to passively produce displacement. After displacement, the diameter of the petal-shaped slide block 2 part increases, and the slide block collides with the inner wall of the borehole to realize omnidirectional controllable directional deviation during directional drilling. The protruding part of the petal-shaped slide block 2 is provided with a pressure sensor. The pressure sensor outside the petal-shaped slide block can monitor the pressure between the outer wall of the petal-shaped slide block and the borehole wall, which has the following effects:

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

[0054] 2. According to the provided pressure, the stability of the borehole wall is ensured to prevent the collapse of the hole wall;

[0055] 3. By the pressure, the size of the water pressure that the flushing liquid should provide is determined, and the position of the water joint is adjusted.

[0056] As an embodiment, the directional drilling core bit 1 is slightly larger than the outermost outer drill pipe 3, so that there is a certain distance between the outer drill pipe 3 and the borehole hole, which provides a movable space for the build-up during drilling; secondly, the drill pipe column 15cm-20cm at the joint of the core bit 1 is designed as a four-equal-part petal-shaped slider, the outer wall of the petal-shaped slider is convex, the inner wall is tightly fitted with the inner straight helical slide rod, and the convex part has a diameter smaller than the core bit during straight-line drilling. The petal-shaped slider and the rear outer drill pipe are connected by a one-way bearing, which can produce angular displacement perpendicular to the drilling direction;

[0057] The outer wall of the straight helical slide rod at the contact part of the petal-shaped slider is provided with a driven hydraulic build-up device, which is composed of a convex cylindrical block, which is densely and uniformly distributed at the contact part, and a signal receiving device is arranged in the block, which can remotely control the size and range of the convex cylindrical block. The displacement of the cylindrical block is generated, which pushes the passive displacement of the outer petal-shaped slider, and the diameter of the petal-shaped slider part increases after displacement, which causes the collision and contact between the slider and the inner wall of the borehole to realize the full-direction controllable directional build-up during directional drilling. The convex part of the petal-shaped slider is provided with a pressure sensor, which transmits a signal according to the actual situation of the project after the pressure reaches the rated value, and the displacement of the cylindrical block is stopped by the remote control station. The probe or signal emitter is arranged in the core bit, which realizes directional build-up by signal emission and determines the coincidence of the actual track and the designed track during coring. The main material of the petal-shaped slider is a new type of lightweight high-strength drill pipe material Cf / Al (i.e. aluminum alloy material), which has higher overall strength than rock mass, and the strength design is referred to existing research, which meets the requirements of the overall bending strength limit of the rotary radius of the drill pipe. During straight-line drilling, the side walls of each petal-shaped slider are rigidly connected through insertable sliders, and together with the drill pipe, they form a locally separable integrated directional drilling coring equipment.

[0058] As Figure 2 , Figure 3 , Figure 5 , Figure 9As shown, the hollow inner screw 6 is internally hollow, and the inner wall of the straight helical sliding rod 4 is provided with a core holding device 10 near the drill bit. The core holding device 10 is an inner wall protruding sliding block, and the contact part of the sliding block with the core is rough. When the core is taken out to the holding device, the sliding block is controlled to slide out and form contact with the core through remote operation, and the core is connected with the inner wall of the straight helical sliding rod through pressure. After the core is completely taken out, the screw motor drives the straight helical sliding rod inner cylinder and the core to slide out, realizing coring. The hollow inner screw 6 is internally provided with a pressurizing device, which can displace along the diameter direction of the drilling tool. The pressurizing device fully utilizes the friction force to realize the close connection with the core 9 through the pressurizing mode, so that the taken core and the straight helical sliding rod produce the same displacement effect. The inside of the straight helical sliding rod is hollowly designed, and the pressurizing fixation with the core after coring by the coring drill bit realizes the synchronous displacement of the hollow inner screw and the core.

[0059] As an embodiment, the inside of the straight helical sliding rod 4 is hollowly designed, the front part of the straight helical sliding rod 4 is connected with the coring drill bit 1, and the inside of the hollow inner screw 6 of the straight helical sliding rod 4 is provided with a pressurizing device. The pressurizing device can displace along the diameter direction of the drilling tool. The pressurizing device fully utilizes the friction force to realize the close connection with the core 9 through the pressurizing mode, so that the taken core and the straight helical sliding rod produce the same displacement effect. The pressurizing device at the front end of the straight helical sliding rod 4 can be controlled through remote operation, and the pressurizing and depressurizing during the core conveying process can be freely realized, so that the displacement of the hollow inner screw 6 and the core 9 is unified. Secondly, the proposed coring drilling tool is a straight rod without curvature and hollow. The straight helical sliding rod can realize continuous coring during drilling. At the same time, the proposed external drilling rod can realize the transmission of the built-in water connector and other equipment. In the long-distance drilling process, through specific equipment, the risk of sticking is reduced, the stability of the hole wall is ensured, or the smooth transportation of the core is ensured. The drilling machine monitoring and control system can receive and monitor the drilling machine operation parameters and drilling process parameters at any time, and can always ensure that the drilling construction is carried out under the optimal parameter condition.

[0060] As shown in Figure 5 , the inside of the straight helical sliding rod 4 is hollowly designed, and the pressurizing fixation with the core 9 after coring by the coring drill bit 1 can realize the synchronous displacement of the inner screw and the core. The rear screw motor operation drives the core to be quickly transported through the straight helical sliding rod device, realizing coring.

[0061] As shown in Figure 7 , when there is a need to build an angle, the cylindrical protrusion of the sliding rod outer wall is displaced by a certain displacement, the lobe-shaped sliding block protrusion is controlled to contact the hole wall to achieve the purpose of building an angle.

[0062] Embodiment 2

[0063] A full-hole coring method of a directional drilling hollow rotary steerable coring drill string is provided in one embodiment of the present disclosure. In existing research, the hole body limit bending strength of the drill pipe working safely in the curved borehole is studied. When the drill string drills in the curve section, the drill pipe bears compression, torsion and bending load, and the bending load is superimposed by "passive" and "active" parts. The "passive" part is the bending load generated due to the bending of the drill pipe under the stress of the curved borehole, and the "active" part is the bending load generated due to the transmission of the axial pressure and the torque of the drill pipe. In the drilling process, the drill pipe generates bending deformation under the bending moment and rotates around its own axis, and the stress in the drill pipe has the asymmetric cyclic alternating characteristic. The research ensures the hole body limit bending strength of the drill pipe working safely in the curved borehole by calculating the fatigue of the drill pipe working under the alternating stress:

[0064] The bending stress of the drill pipe generated due to the bending of the curved borehole is:

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

[0066] The bending stress of the drill pipe generated due to the transmission of the pressure and the torque is:

[0067] D k —borehole diameter, d—outer diameter of the drill pipe, l—minimum half-wave length of the bending of the drill pipe (the value can be solved by T.M. Salkovskiy formula)

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

[0069] The stress amplitude in the drill pipe under asymmetric cycle:

[0070] σ -1 —endurance limit of the drill pipe material under bending in symmetric cycle, K σ —effective stress concentration coefficient reflecting the influence of the shape of the component (obtained by table lookup), ψ σ —sensitivity coefficient of the material to asymmetric stress cycle, ε σ —size coefficient reflecting the influence of the size of the component, β—surface quality coefficient reflecting the influence of the surface quality of the component.

[0071] For the steel drill pipe made of plastic material, the strength condition can be established by the third and fourth strength theories, and according to the bending stress in the drill pipe, the stress amplitude σ a in the stress cycle can be known, and the safe working hole body limit bending strength of the drill pipe column with curvature is:

[0072]

[0073] Further, the full-hole coring method of the kilometer-level directional drilling hollow rotary steerable coring drill of the present disclosure comprises:

[0074] Obtaining the set drilling trajectory;

[0075] The directional drilling is drilled at the tunnel face or external rock mass, and the trajectory is monitored by the coring bit tracking device of the directional drilling. The drilling is performed according to the predetermined trajectory by the rotary cutting of the coring bit.

[0076] If deviation is needed during drilling, first, the rigid connecting body between the corresponding petal-shaped sliding block and the adjacent sliding block is slid out, the cylindrical block under the corresponding petal-shaped sliding block is controlled according to the set trajectory to make the petal-shaped sliding block produce a certain angular displacement, the directional drilling is inclined to the opposite direction by a certain inclination angle through the contact pressure between the petal-shaped sliding block and the borehole wall, and the deviation effect is achieved.

[0077] When drilling to the coring position, the coring bit is used for coring, the hollow inner screw wall of the straight helical sliding rod connected with the coring bit is in close contact with the core, the inner screw wall is in close contact with the rear part of the core through pressurization, the gas-liquid-electric coupling power screw motor drives the outer drill rod of the straight helical sliding rod to rotate, and the hollow inner screw and the fixed core are passively driven to produce axial displacement along the inner wall thread of the outer drill rod, so that the core is taken out.

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

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

[0080] Step two: the directional drilling is drilled at the tunnel face or external rock mass, and the trajectory is monitored by the coring bit tracking device of the directional drilling. The drilling is performed according to the predetermined trajectory by the rotary cutting of the coring bit.

[0081] Step three: if deviation is needed during drilling, the omnidirectional sliding block directional deviation device is controlled by the remote control station. First, the rigid connecting body between the corresponding petal-shaped sliding block and the adjacent sliding block is slid out, the cylindrical block under the corresponding petal-shaped sliding block is controlled according to the set trajectory to make the petal-shaped sliding block produce a certain angular displacement, the directional drilling is inclined to the opposite direction by a certain inclination angle through the contact pressure between the petal-shaped sliding block and the borehole wall, and the deviation effect is achieved.

[0082] Step four: the flushing fluid is introduced through the hole and the drill rod to reduce the risk of sticking and maintain the stability of the borehole.

[0083] Step five: when drilling to the coring position, the coring bit carries out coring. The inner wall of the straight helical slide rod inner barrel connected with the coring bit is closely connected with the core, and through the close contact with the rear part of the core by pressurization, the slide rod outer column is rotated by the screw motor, the hollow inner screw rod in the passive device and the fixed core produce axial displacement along the thread of the slide rod outer column, and the core is taken out.

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

[0085] Step seven: after the successful coring of the previous core, the coring bit continues to drill during the transportation process, and reaches the next coring position according to step three.

[0086] Step eight: repeat steps four and five until coring is completed, and realize continuous coring of the rock mass.

[0087] Step nine: remotely control the drill pipe to be retracted.

[0088] Example 3

[0089] In an embodiment of the present disclosure, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the full-hole coring method of the directional drilling hollow rotary steerable coring drill.

[0090] Example 4

[0091] In an embodiment of the present disclosure, a non-transitory computer readable storage medium is provided for storing computer instructions, which, when executed by a processor, implement the full-hole coring method of the directional drilling hollow rotary steerable coring drill.

[0092] Example 5

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

[0094] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 one or more flow or blocks

[0095] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 one or more flow or blocks

[0096] Although the present disclosure has been described with reference to the embodiments thereof, it is apparent that a variety of modifications or changes can be made thereto without departing from the scope of the present disclosure.

Claims

1. A directional drilling hollow steerable rotary coring drill tool, characterized by, The external drill rod and the core drill bit are connected with the straight helical slide 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 threaded groove, the outer wall of the hollow inner screw rod is provided with a threaded convex, the outer wall of the hollow inner screw rod is in threaded connection with the inner wall of the slide rod outer column, and the hollow inner screw rod can be axially displaced in the thread track provided by the threaded groove of the slide rod outer column in the drilling direction; The core drill bit is connected with the straight helical slide rod, the outer wall of the slide rod outer column is fixedly connected with the inner wall of the external drill rod, the external drill rod is connected with a gas-liquid-electric coupling power screw motor, the gas-liquid-electric coupling power screw motor drives the slide rod outer column connected with the inner wall of the external drill rod to rotate, thereby driving the hollow inner screw rod to rotate reversely, axially displacing along the thread track, and driving the core drill bit to carry out directional coring. The outer wall of the petal-shaped slide block is convex, and the diameter of the convex part is smaller than the diameter of the core drill bit in the straight drilling process. A main hydraulic deviation device is arranged outside the outer wall of the straight helical slide rod at the contact position of the petal-shaped slide block, the main hydraulic deviation device is composed of cylindrical blocks, the cylindrical blocks are densely and uniformly distributed at the contact position, and the displacement of the cylindrical blocks pushes the external petal-shaped slide block to passively displace, the diameter of the petal-shaped slide block is increased after displacement, the slide block collides with the inner wall of the borehole to realize full-directional controllable directional deviation in the directional drilling process, and a pressure sensor is arranged at the convex position of the petal-shaped slide block.

2. A directional drilling hollow steerable rotary drill tool as defined in claim 1, wherein, The inner size of the core drill bit is greater than that of the external drill rod, and the drill rod is provided with a certain distance at the joint with the core drill bit and is designed as a four-equal-part petal-shaped slide block, and the inner wall is tightly fitted with the internal straight helical slide rod.

3. A directional drilling hollow steerable rotary drill tool as defined in claim 2 wherein, The petal-shaped slide block and the external drill rod are connected by a one-way bearing to generate angular displacement perpendicular to the drilling direction.

4. A directional drilling hollow steerable rotary drill tool as defined in claim 1, wherein, The hollow inner screw rod is hollow inside, the hollow inner screw rod is provided with a pressurizing device, the pressurizing device can displace along the diameter direction of the drilling tool, and the pressurizing device fully utilizes the friction force to realize the tight connection with the core, so that the taken core and the straight helical slide rod have the same displacement effect.

5. A directional drilling hollow steerable rotary drill tool as defined in claim 1 wherein, The threaded groove of the inner wall of the slide rod outer column and the threaded convex of 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 slide rod.

6. A directional drilling hollow steerable rotary drill tool as defined in claim 1 wherein, The straight helical slide rod is hollow inside, and the hollow inner screw rod and the core are synchronously displaced through the pressurizing fixation of the core taken by the core drill bit.

7. A full-hole coring method for a directional drilling hollow steerable directional coring drill based on any one of claims 1-6, characterized in that, It comprises: acquiring a set drilling track; the directional drilling enters the drill in the tunnel face or external rock mass, the track of the directional drilling is monitored through a directional drilling core drill bit tracking device, and the directional drilling is drilled along the predetermined track through the rotary cutting of the core drill bit; if deviation is needed in the drilling process, first, the rigid connecting body between the petal-shaped slide block and the adjacent slide block is slid out, the cylindrical block under the corresponding petal-shaped slide block is controlled according to the set track to make the petal-shaped slide block generate a certain angular displacement, the directional drilling is inclined to the opposite direction to generate a certain inclination angle through the contact pressure between the petal-shaped slide block and the borehole wall; When drilling to the coring position, the coring bit carries out coring, the hollow inner screw wall of the straight screw slide rod connected with the coring bit is closely connected with the core, and the hollow inner screw wall is closely contacted with the rear part of the core through pressurization, then the gas-liquid-electric coupling power screw motor drives the slide rod outer column of the straight screw slide rod to rotate, passively drives the hollow inner screw and the fixed core to produce axial displacement along the inner wall thread of the outer drill rod, and the core is taken out.

8. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the full-hole coring method of the directional drilling hollow rotary steerable coring drill tool.

9. A non-transitory computer-readable storage medium, comprising: The non-transitory computer readable storage medium is used to store computer instructions, and the computer instructions are executed by the processor to realize the full-hole coring method of the directional drilling hollow rotary steerable coring drill tool.

10. An electronic device, comprising: Comprise: A processor, a memory and a computer program; wherein the processor is connected with the memory, the computer program is stored in the memory, and when the electronic equipment is running, the processor executes the computer program stored in the memory, so that the electronic equipment executes the full-hole coring method of the directional drilling hollow rotary steerable coring drill tool.

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