CN118167232A - Continuous core drill bit - Google Patents

Abstract

The invention discloses a continuous coring bit in the field of geological exploration machinery, and aims to solve the problems that operation is inconvenient and a continuous coring function is lacking in the prior art. It comprises the following steps: the coring barrel is positioned in the guide coring bit body to realize the integration of directional drilling and coring functions, and the deformation of the diamond four-bar mechanism is controlled by the rope, the mud pressure and the counter force at the front end of the bit, so that the coring barrel is continuously arranged in the guide coring bit body to perform sampling operation or taken out from the drill rod, and meanwhile, the operation is simpler; the controllable directional continuous coring device has the advantages of little interference to a guiding signal, capability of tracking and positioning the underground drill bit in real time, capability of utilizing the hollow hole of the device to perform directional continuous coring operation underground, and adaptability to bottom layers with different hardness.

Description

Continuous core drill bit

Technical Field

The invention relates to a continuous coring bit, and belongs to the field of geological exploration machinery.

Background

The directional coring bit can realize directional drilling according to a preset track and is commonly used in the field of advanced geological exploration. The application of the directional coring bit at present can reduce the tunnel construction risk, find out the surrounding rock and the groundwater position in time, and provide effective data support for great engineering decisions such as the feasibility research, the design and the construction of the large tunnels such as the submarine tunnels.

The inventor finds that the existing directional coring mainly uses a screw motor to perform directional drilling, can not perform coring, and adopts a conventional coring drilling tool to perform lifting and coring construction after reaching a designed coring position, so that the method can not meet the requirement of continuously obtaining geological samples, and has low construction speed and low efficiency.

In view of the above, currently available coring device bits are inconvenient to operate and lack a continuous coring function.

Disclosure of Invention

The utility model aims at overcoming the defects in the prior art and providing a continuous coring bit which is convenient to operate and has a continuous coring function.

In order to achieve the above purpose, the present disclosure is implemented by adopting the following technical schemes:

in a first aspect, the present disclosure provides a continuous coring bit comprising,

The guide coring bit body is connected with the drill rod, and a stop structure is arranged on the inner wall of the guide coring bit body;

The diamond four-bar mechanism is arranged in the guide coring bit body, the hinge points of the diamond four-bar mechanism comprise control hinge points respectively positioned at two axial ends of the guide coring bit body, the hinge points of the diamond four-bar mechanism also comprise limit hinge points distributed along the radial direction of the guide coring bit body, and the limit hinge points are connected with the stop blocks; applying forces in different directions to the control hinge point so as to drive the limit hinge point to radially spread or overlap, thereby realizing control of stop contact between the stop block and the stop structure;

the coring barrel is sleeved in the guide coring bit body in a sliding manner, one control hinge point of the diamond-shaped four-bar mechanism is hinged with a coring spearhead, the other control hinge point of the diamond-shaped four-bar mechanism is hinged with the coring barrel, and the coring spearhead is used for being connected with a rope.

In some embodiments of the first aspect, the pilot-coring bit body is connected to the drill pipe by NC threading, external threading is located on the drill pipe, and internal threading is located on the pilot-coring bit body.

In some embodiments of the first aspect, a probe pocket is provided in a sidewall of the pilot-coring bit body, the probe pocket being isolated from a passageway of the pilot-coring bit body, the probe pocket for placement of a pilot probe.

In some embodiments of the first aspect, the core barrel includes an anti-slip plate hinged to the control hinge point, a step is provided in the pilot coring bit body to prevent the anti-slip plate from slipping out, the core barrel further includes a cylindrical coring wall that slides radially along the pilot coring bit body, and the anti-slip plate is sealingly connected to an end of the coring wall proximate the diamond four bar linkage.

In some embodiments of the first aspect, a drain passage is provided in the pilot-coring bit body, a water inlet of the drain passage being adjacent to the anti-drop plate.

In some embodiments of the first aspect, the inner wall of the pilot-coring bit body is provided with a plurality of centering rings for positioning the coring wall.

In some embodiments of the first aspect, the diamond-shaped four-bar linkage comprises a first link proximate the core barrel, one end of the first link facing away from the core barrel is hinged to the limit hinge point, the first link extends outward at the limit hinge point to form the stop, when the stop is in stop contact with the stop structure, a stop force of the stop structure applies a rotational moment to the stop relative to the limit hinge point, the rotational moment causing the limit hinge point to have a tendency to radially expand.

In some embodiments of the first aspect, the coring spearhead arrow is shaped with the arrow pointing away from the pilot coring bit body.

In some embodiments of the first aspect, the guide plate is fixed on the outer plane of the guide coring bit body through bolts, the drill rod stops rotating and continues to advance, and the reaction force of the hole wall bends and turns the guide coring bit body through the action of the guide plate.

In a second aspect, the present disclosure also provides a method of using a continuous coring bit, the single coring process comprising:

guiding the coring bit body to a predetermined coring position;

the rope pulls the coring spearhead, and the diamond four-bar mechanism deforms to enable the limiting hinge points to be radially overlapped;

pulling a coring spearhead to the drill rod inlet, cleaning the coring barrel or taking out the core;

The cleaned core barrel is put back into the drill rod;

using mud to press the core barrel to the pilot coring bit body;

The rope unloads the force, the drilling rod applies the coring pressure, the diamond four-bar mechanism deforms under the action of the counterforce of the front end of the drill bit and the mud pressure to enable the limiting hinge point to be unfolded radially, and the stop block is contacted with the stop block of the stop structure;

the core barrel takes core and samples.

Compared with the prior art, the beneficial effect that this disclosure reached:

The continuous coring bit provided by the disclosure has the advantages that the coring barrel is positioned in the guide coring bit body to realize the integration of directional drilling and coring functions, the deformation of the diamond four-bar mechanism is controlled through the rope and the coring pressure, so that the coring barrel is continuously arranged in the guide coring bit body to perform sampling operation or is taken out from the drill rod, and meanwhile, the operation is simpler; the controllable directional continuous coring device has the advantages of little interference to a guiding signal, capability of tracking and positioning the underground drill bit in real time, capability of utilizing the hollow hole of the device to perform directional continuous coring operation underground, and adaptability to bottom layers with different hardness.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure or the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the prior art descriptions, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic view of the structure of the continuous coring bit provided in this embodiment with the limit hinge points deployed;

FIG. 2 is a schematic view of a partial structure of the limit hinge point of FIG. 1 when overlapped;

FIG. 3 is a flow chart of a single coring process of the continuous coring bit of FIG. 1;

In the figure: 1-a drill rod; 2-guiding a coring bit body; 3-diamond four-bar linkage; 3.1-controlling the hinge point; 3.2-limiting hinge points; 3.3-stop; 3.4-a first link; 4-a core barrel; 4.1-an anti-drop plate; 4.2-coring wall; 5-righting the ring; 6-coring spearhead; 7-a probe bin; 8-drainage channels; 9-a guide plate; 10-stop structure.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure and the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure/application, its application, or uses.

Example 1

The embodiment provides a continuous coring bit to solve the problems of inconvenient operation and lack of continuous coring function in the prior art.

Referring to fig. 1 and 2, the continuous coring bit provided in this embodiment includes a pilot coring bit body 2, the pilot coring bit body 2 is connected to a drill rod 1, the drill rod 1 applies a coring pressure to the pilot coring bit body 2 or applies a coring pressure and torque to achieve the coring of the sampling point by the pilot coring bit body 2, and the inner wall of the pilot coring bit body 2 is provided with a stop structure 10.

The continuous coring bit further comprises a diamond-shaped four-bar mechanism 3, the diamond-shaped four-bar mechanism 3 is arranged in the guide coring bit body 2, as can be seen by those skilled in the art, the diamond-shaped four-bar mechanism is generally formed by hinging four bars with each other, and other hinging points can rotate through the control hinging points, so that in the embodiment, the hinging points of the diamond-shaped four-bar mechanism 3 comprise control hinging points 3.1 respectively positioned at two axial ends of the guide coring bit body 2, the hinging points of the diamond-shaped four-bar mechanism 3 further comprise limiting hinging points 3.2 distributed along the radial direction of the guide coring bit body 2, and the limiting hinging points 3.2 are connected with the stop blocks 3.3; and different directional forces are applied to the control hinge point 3.1 to drive the limit hinge point 3.2 to radially spread or overlap, so that the control stop block 3.3 is in stop contact with the stop structure 10.

The continuous coring bit further comprises a coring barrel 4, the coring barrel 4 is sleeved into the guide coring bit body 2 in a sliding mode, one control hinge point 3.1 of the diamond-shaped four-bar linkage mechanism 3 is hinged to the coring spearhead 6, the other control hinge point 3.1 is hinged to the coring barrel 4, and the coring spearhead 6 is used for being connected with a rope.

Referring to fig. 3, a non-exclusive method of use: referring to fig. 1, the drill rod 1 applies coring pressure to the pilot coring bit body 2 to enable the pilot coring bit body 2 to advance, as the pilot coring bit body 2 is subjected to reaction force from stratum near the control hinge point 3.1 of the coring barrel 4 during the advancing process, the reaction force is directed to the geometric interior of the diamond-shaped four-bar mechanism 3, at the moment, the control hinge point 3.1 near the coring spearhead 6 is subjected to forward pressure acted by slurry and is directed to the geometric interior of the diamond-shaped four-bar mechanism 3, therefore, based on deformation property of the diamond-shaped four-bar mechanism 3, limit hinge points 3.2 on two sides of the diamond-shaped four-bar mechanism 3 are unfolded radially to enable the stop block 3.3 to be in stop contact with the stop structure 10, and the stop structure 10 is prevented from moving towards the drill rod 1 by the stop block 3.3, at the moment, the diamond-shaped four-bar mechanism 3 is fixed in the pilot coring bit body 2.

After the pilot coring bit body 2 reaches the predetermined coring position, the core body of the last coring or sand and stone deposited in the advancing process is also in the coring barrel 4, referring to fig. 2, the coring spear 6 is pulled by a rope, the coring spear 6 and the diamond four-bar mechanism 3 are hinged at the other control hinge point 3.1, although the pulling force of the coring spear 6 is towards the drill rod 1, the pulling force of the coring spear 6 points to the geometric outside of the diamond four-bar mechanism 3, and based on the deformation property of the diamond four-bar mechanism 3, the limit hinge points 3.2 on two sides of the diamond four-bar mechanism 3 are overlapped radially to the pilot coring bit body 2, so that the stop 3.3 can pass through the stop structure 10, and the diamond four-bar mechanism 3 and the coring barrel 4 thereof can be pulled back from the pilot coring bit body 2 to the inlet of the drill rod 1.

After removing sand and stones deposited in the core barrel 4 or taking out a core sample, the diamond-shaped four-bar mechanism 3 and the core barrel 4 thereof are put back into the drill rod 1 and sent back to the guide coring bit body 2; the diamond four-bar linkage mechanism 3 and the coring barrel 4 can be automatically reset based on gravity, and mud can be pressed into the drill rod 1 by external force, so that the mud can push the coring barrel 4 to reset. Optionally, the rope can provide pulling force properly in the process, and the diamond-shaped four-bar mechanism 3 is stretched to enable the limit hinging points 3.2 to be close to each other in cooperation with the pressure feeding action of slurry on the core barrel 4.

After the diamond four-bar mechanism 3 passes through the stop structure 10, the rope removes force, the drill rod 1 applies coring pressure, so that the diamond four-bar mechanism 3 deforms, the limiting hinge point 3.2 is unfolded radially, the reaction force of the coring pressure enables the stop block 3.3 to abut against the stop structure 10, the stop structure 10 stops the stop block 3.3, the diamond four-bar mechanism 3 is fixed in the guide coring bit body 2, the position of the coring barrel 4 is further supported and fixed, and the guide coring bit body 2 can normally drill and guide a turning, so that the state of fig. 1 is realized. At this point the coring pressure or pressures continue to be applied while a turning moment is applied to the pilot coring bit body 2, which is advanced into the core barrel 4. The core barrel 4 can then either be removed from the inlet of the drill rod 1 or the pilot coring bit body 2 can be driven directly to advance to the next sampling point.

It will be apparent to those skilled in the art that if the diamond four-bar linkage 3 and its adjacent structure fail, the pilot coring bit body 2 may be disconnected from the drill rod 1 and replaced with a new continuous coring bit recovery operation.

Compared with the prior art, the continuous coring bit provided by the embodiment can realize continuous sampling, integrates a drilling machine and sampling equipment, and simultaneously adopts pulling force and sampling pressure to control the position of the coring barrel 4, so that the operation is convenient.

Example two

The present embodiment provides a continuous core drill, which is modified based on the first embodiment, and the continuous core drill provided in this embodiment may also be a use method of the continuous core drill shown in fig. 3, which is not described in detail in the first embodiment.

In order to prevent fatigue fracture of the connection point of the pilot-core bit body 2 and the drill rod 1 and realize detachable connection, as one embodiment, the pilot-core bit body 2 and the drill rod 1 are connected through NC thread buckles, external threads are positioned on the drill rod 1, and internal threads are positioned on the pilot-core bit body 2; NC is a thread number, representing a digital thread.

Optionally, in a further but non-limiting embodiment of the present application, referring to FIG. 1, a probe pocket 7 is provided in the sidewall of the pilot coring bit body 2, the probe pocket 7 being isolated from the passageway of the pilot coring bit body 2, the probe pocket 7 being used to house a pilot probe. The probe in the probe bin 7 sends a position signal of the guide coring bit body 2 in real time, and a drilling process curve is drawn through analysis of a guide instrument. When the steering is needed, the drill rod stops rotating and is directly propelled. To facilitate steering of the pilot-coring bit body 2, optionally, in a further but non-limiting embodiment of the present application, the continuous-coring bit further includes a pilot plate 9, the pilot plate 9 being bolted to the outside planar surface of the pilot-coring bit body 2, the reaction force of the bore wall bending the pilot-coring bit body 2 by the action of the pilot plate 9.

Referring to fig. 1, the core barrel 4 comprises an anti-drop plate 4.1 hinged with a control hinge point 3.1, a step is arranged in the guide core bit body 2 to prevent the anti-drop plate 4.1 from being pulled out of the guide core bit body 2 after being subjected to pressure delivery, the core barrel 4 further comprises a cylindrical core taking wall 4.2, the core taking wall 4.2 slides along the radial direction of the guide core bit body 2, and the anti-drop plate 4.1 is closed and connected with one end of the core taking wall 4.2, which is close to the diamond-shaped four-bar mechanism 3.

As one example, referring to fig. 1, a drainage channel 8 is formed in the guide coring bit body 2, a water inlet of the drainage channel 8 is adjacent to the anti-drop plate 4.1, and an outlet of the drainage channel 8 may be formed at one end of the guide coring bit body 2 away from the drill rod 1, so as to drain water in the drill rod 1.

In order to allow the coring wall 4.2 to slide more smoothly within the pilot coring bit body 2, as one example, referring to fig. 1, the inner wall of the pilot coring bit body 2 is provided with a plurality of centering rings 5, the centering rings 5 being used to position the coring wall 4.2, optionally the centering rings 5 being semi-circular in shape with a cambered surface abutting the coring wall 4.2.

As one embodiment, the diamond four-bar linkage 3 includes a first link 3.4 close to the core barrel 4, one end of the first link 3.4 away from the core barrel 4 is hinged with a limiting hinge point 3.2, the first link 3.4 extends outwards at the limiting hinge point 3.2 to form a stop block 3.3, when the stop block 3.3 is in stop contact with the stop block structure 10, a rotation moment is applied to the stop block 3.3 by the stop force of the stop block structure 10 relative to the limiting hinge point 3.2, the rotation moment enables the limiting hinge point 3.2 to generate a radial unfolding trend, and then self-locking fixation of the core barrel 4 is achieved by means of deformation characteristics of the diamond four-bar linkage 3.

As one example, the coring spearhead 6 is arrow-shaped with the arrow pointing away from the pilot coring bit body 2.

Optionally, the drill rod 1 is an inner flat coring drill rod, a hollow cylindrical rod body, and the hollow hole is used for isolating the probe bin 7 from the hollow hole through slurry and a coring drilling tool. Optionally, the stop structure 10 is a stop ring. Optionally, specifically, before the project starts, presetting a track curve of the guide hole according to the sampling point, and directionally drilling holes by using a horizontal directional drilling machine. Optionally, the controllable directional continuous coring bit can be used on an inner drill rod of a double-wall drill rod when the hard rock stratum is cored, and the continuous coring sampling work of the hard rock stratum can be completed by repeating the coring process.

The continuous coring bit provided by the embodiment realizes controllable directional continuous coring, has the advantages of less interference to guide signals, and can track and position the underground bit in real time, and can also utilize the hollow hole to perform directional continuous coring operation underground. And can adapt to bottom layers with different hardness.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "disposed," "located," "mounted," "disposed," etc. are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case. "hinged" includes "rotational connection".

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (10)

1. A continuous coring bit, characterized by comprising,

The guide coring bit body (2), the guide coring bit body (2) is connected with the drill rod (1), and a stop structure (10) is arranged on the inner wall of the guide coring bit body (2);

The diamond-shaped four-bar mechanism (3), the diamond-shaped four-bar mechanism (3) is arranged in the guide coring bit body (2), the hinge points of the diamond-shaped four-bar mechanism (3) comprise control hinge points (3.1) which are respectively positioned at two axial ends of the guide coring bit body (2), the hinge points of the diamond-shaped four-bar mechanism (3) further comprise limit hinge points (3.2) which are distributed along the radial direction of the guide coring bit body (2), and the limit hinge points (3.2) are connected with the stop blocks (3.3); applying forces in different directions to the control hinge point (3.1) so as to drive the limit hinge point (3.2) to radially spread or overlap, thereby realizing control of stop contact between the stop block (3.3) and the stop structure (10);

The coring barrel (4) is sleeved in the guide coring bit body (2) in a sliding mode, one control hinge point (3.1) of the diamond four-bar mechanism (3) is hinged to the coring spearhead (6), the other control hinge point (3.1) is hinged to the coring barrel (4), and the coring spearhead (6) is connected with a rope.

2. A continuous coring bit according to claim 1, wherein the pilot coring bit body (2) is connected to the drill rod (1) by NC threading, with external threads on the drill rod (1) and internal threads on the pilot coring bit body (2).

3. A continuous coring bit according to claim 1, wherein a probe pocket (7) is provided in a sidewall of the pilot coring bit body (2), the probe pocket (7) being isolated from a passage of the pilot coring bit body (2), the probe pocket (7) being adapted for placement of a pilot probe.

4. A continuous coring bit as set forth in claim 1 wherein said core barrel (4) comprises a drop-off prevention plate (4.1) hinged to said control hinge point (3.1), a step being provided in said pilot coring bit body (2) to prevent said drop-off prevention plate (4.1) from falling out, said core barrel (4) further comprising a cylindrical coring wall (4.2), said coring wall (4.2) sliding radially of said pilot coring bit body (2), said drop-off prevention plate (4.1) closing one end of said coring wall (4.2) adjacent said diamond-shaped four bar linkage (3).

5. A continuous coring bit as set forth in claim 4 wherein a drain passage (8) is provided in the pilot coring bit body (2), a water inlet of the drain passage (8) being adjacent the anti-drop plate (4.1).

6. A continuous coring bit as set forth in claim 4, wherein an inner wall of the pilot coring bit body (2) is provided with a plurality of centering rings (5), the centering rings (5) being used to position the coring wall (4.2).

7. A continuous coring bit as set forth in claim 1 wherein the diamond four bar linkage (3) comprises a first link (3.4) adjacent the core barrel (4), the end of the first link (3.4) facing away from the core barrel (4) being hinged to the limit hinge point (3.2), the first link (3.4) extending outwardly at the limit hinge point (3.2) to form the stop (3.3), the stop force of the stop (10) imparting a rotational moment to the stop (3.3) relative to the limit hinge point (3.2) when the stop (3.3) is in stop contact with the stop (10), the rotational moment tending to radially spread the limit hinge point (3.2).

8. A continuous coring bit as set forth in claim 1, wherein the coring spear (6) has an arrow shape, the arrow pointing away from the pilot coring bit body (2).

9. A continuous coring bit as set forth in claim 1, further comprising a pilot plate (9), wherein the pilot plate (9) is bolted to an outer planar surface of the pilot coring bit body (2), and wherein reaction forces of the bore wall bend and steer the pilot coring bit body (2) by the action of the pilot plate (9).

10. A method of using a continuous coring bit, wherein the single coring process comprises:

guiding the coring bit body (2) to a predetermined coring position;

The rope pulls the coring spearhead (6), and the diamond four-bar mechanism (3) deforms to enable the limiting hinge points (3.2) to be radially overlapped;

pulling a coring spearhead (6) to the inlet of a drill rod (1), cleaning a coring barrel (4) or taking out a core body;

The cleaned core barrel (4) is put back into the drill rod (2);

using mud to force the core barrel (4) into the pilot coring bit body (2);

The rope unloads the force, the drill rod (1) applies the coring pressure, the diamond four-bar mechanism (3) deforms under the action of the counterforce at the front end of the drill bit and the mud pressure to enable the limiting hinge point (3.2) to be unfolded radially, and the stop block (3.3) is in stop contact with the stop structure (10);

the core barrel (4) is used for core sampling.