A coring device for deep geological drilling in complex formations

Abstract

The utility model relates to drill bit technical field especially relates to a complex stratum deep hole geological drilling construction coring device, including hard alloy drill bit and outer drill cylinder, the inside fixed mounting of outer drill cylinder has the core taking cylinder, the lower extreme of drill pipe is provided with the cylinder groove that links together with the inside of outer drill cylinder, the vertical sliding installation of cylinder groove has the sliding seat, the lower surface vertical fixed mounting of sliding seat has the drill core rod, the lower extreme of drill core rod is installed the core rod drill head, the side of sliding seat is provided with the locating groove, the side of drill pipe is provided with two mounting grooves, two the mounting groove all are equipped with the locking assembly. The utility model can complete the switching of the drilling core and the coring mode without disassembling the drill pipe and the outer drill cylinder, solve the drawbacks of the traditional device disassembly replacement, save operation time and manpower cost greatly, avoid the problem of the docking precision decline caused by the repeated disassembly of the drill pipe and the outer drill cylinder, reduce the risk of sticking and leakage.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a core sampling device for deep-hole geological drilling in complex formations. Background Technology

[0002] In fields such as geological exploration, mineral resource exploration, and engineering geological survey, deep-hole geological drilling and core sampling equipment in complex strata is the core equipment for obtaining underground rock core samples. It can complete deep-hole drilling and core extraction under complex geological conditions such as fractured strata and gravel layers, providing key physical evidence for stratigraphic structure analysis and resource reserve assessment.

[0003] Chinese patent CN223447007U discloses a core sampling device for deep-hole geological drilling in complex strata. During drilling, a core rod can be installed in the receiving cavity, allowing the drill bit to drill directly and quickly to a specific depth. When core sampling is required, the core rod can be replaced with a core sampling tube, which can ensure the drilling effect while allowing the rock core to enter the core sampling tube, thereby achieving rapid extraction of rock cores at a specific depth.

[0004] In the aforementioned patent documents, when replacing the core rod and core tube, the core rod must first be disassembled from the outer drill tube before the core rod or core tube inside the cavity can be replaced. This disassembly-based replacement method requires a lot of time and manpower, and the repeated disassembly of the core rod and outer drill tube can easily lead to a decrease in docking accuracy, increasing the risk of the device getting stuck or missing drill bits. Utility Model Content

[0005] The purpose of this utility model is to solve the following shortcomings in the prior art: when replacing the core rod and core tube, the drill rod must be disassembled from the outer drill tube before the core rod or core tube in the receiving cavity can be replaced. This disassembly replacement method requires a lot of time and manpower, and the repeated disassembly of the drill rod and the outer drill tube can easily lead to a decrease in docking accuracy and increase the risk of the device getting stuck or missing. Therefore, this utility model proposes a core sampling device for deep hole geological drilling in complex strata.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A core sampling device for deep-hole geological drilling in complex formations includes a cemented carbide drill bit and an outer drill barrel. The cemented carbide drill bit is installed at one end of the outer drill barrel, and a drill rod is installed at the other end of the outer drill barrel. A core sampler is fixedly installed inside the outer drill barrel. A cylindrical groove communicating with the inside of the outer drill barrel is opened at the lower end of the drill rod. One end of the core sampler extends into the cylindrical groove. A sliding seat is vertically slidably installed in the cylindrical groove. A core rod is vertically fixedly installed on the lower surface of the sliding seat. A core rod bit is installed at the lower end of the core rod through an installation assembly. The lower end of the core rod is slidably inserted into the core sampler. The sliding seat has a positioning groove on its side, and the drill rod has two mounting grooves on its side. The two mounting grooves are equipped with locking components for locking the sliding seat.

[0007] Preferably, the inner walls of both mounting slots are provided with threaded holes that communicate with the cylindrical slots, and the locking assembly includes two hexagon socket screws, which are threaded into the two threaded holes respectively.

[0008] Preferably, the length of the hexagon socket screw is greater than the depth of the threaded hole, and one end of one of the hexagon socket screws is inserted into the positioning groove.

[0009] Preferably, a guide rail is vertically fixedly installed in the cylindrical groove, and a limiting groove is opened on the side of the sliding seat, and the guide rail is slidably inserted into the limiting groove.

[0010] Preferably, the diameter of the sliding seat is larger than the aperture of the core-taking cylinder, the sliding seat is located at the upper end of the core-taking cylinder, and one end of the guide rail abuts against the upper end of the core-taking cylinder.

[0011] Preferably, the lower end of the core rod has a movable groove, the top of the movable groove has a sliding groove, the mounting assembly includes a slider vertically slidably installed in the sliding groove and a movable column vertically slidably installed in the movable groove, the two ends of the movable column are fixedly connected to the slider and the core rod drill bit respectively, and the depth of the sliding groove is greater than the height of the slider.

[0012] Preferably, a rubber sealing ring is fitted on the movable column, and the upper and lower sides of the rubber sealing ring are respectively attached to the lower end of the core rod and the upper end of the core rod drill bit.

[0013] Preferably, a counterweight is fixedly installed on the upper surface of the sliding seat, and the counterweight is made of metal.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The core rod slides vertically inside the core barrel via the sliding seat, and the position is locked by the locking component. The core drilling and core retrieval modes can be switched without disassembling the core rod and the outer drill barrel. This solves the drawback of the traditional device that requires disassembly and replacement, greatly saves operation time and labor costs, and avoids the problem of reduced docking accuracy caused by repeated disassembly of the core rod and the outer drill barrel, thus reducing the risk of stuck drill and missed drill. 2. The guide rail and the sliding seat limit groove cooperate to provide precise guidance for the sliding of the core rod, ensuring that the core rod always moves along the axis of the core barrel, avoiding deviation that causes the internal hexagon screw to deviate from the positioning groove. The diameter of the sliding seat is larger than the diameter of the core barrel hole, which can limit its downward stroke and prevent the core rod drill bit from going too deep into the core barrel, ensuring the precision and controllability of core taking and drilling operations. 3. The rubber sealing ring on the moving column fits tightly against the core rod and the core rod drill bit. When the core rod drill bit is under pressure, it will squeeze the rubber sealing ring and deform, which will seal the core rod and the core barrel. This can effectively prevent mud, sand and gravel in complex formations from entering the core rod and avoid wear or blockage of the components. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a core sampling device for deep-hole geological drilling in complex strata proposed in this utility model; Figure 2 A three-dimensional structural diagram of the drilling mode of a core sampling device for deep-hole geological drilling in complex strata proposed in this utility model; Figure 3 A three-dimensional structural diagram of the core sampling mode of a deep-hole geological drilling core sampling device for complex strata proposed in this utility model; Figure 4 A three-dimensional structural diagram of the sliding seat and the core rod; Figure 5 A cross-sectional view of the core rod, mounting assembly, and core rod drill bit; Figure 6 for Figure 3 A magnified view of part A in the image.

[0016] In the diagram: 1 Carbide drill bit, 2 Outer drill barrel, 3 Drill rod, 4 Core barrel, 5 Sliding seat, 6 Core rod, 7 Core rod drill bit, 8 Hex socket screw, 9 Guide rail, 10 Slider, 11 Moving column, 12 Rubber sealing ring, 13 Counterweight. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Reference Figures 1-3 A core sampling device for deep-hole geological drilling in complex strata includes a carbide drill bit 1 and an outer drill barrel 2. The carbide drill bit 1 is installed at one end of the outer drill barrel 2, and a drill rod 3 is installed at the other end of the outer drill barrel 2. A core sampling tube 4 is fixedly installed inside the outer drill barrel 2. A cylindrical groove communicating with the inside of the outer drill barrel 2 is opened at the lower end of the drill rod 3. One end of the core sampling tube 4 extends into the cylindrical groove. A sliding seat 5 is vertically slidably installed in the cylindrical groove. A core rod 6 is vertically fixedly installed on the lower surface of the sliding seat 5. A core rod drill bit 7 is installed at the lower end of the core rod 6 through an installation component. The lower end of the core rod 6 is slidably inserted into the core sampling tube 4. A positioning groove is opened on the side of the sliding seat 5. Two installation grooves are opened on the side of the drill rod 3. Locking components for locking the sliding seat 5 are provided in the two installation grooves.

[0021] The carbide drill bit 1 has high hardness and wear resistance, making it suitable for drilling operations in complex formations. It is responsible for breaking up the formation rocks. The outer drill barrel 2 provides installation and protection space for the core barrel 4 and the core rod 6, and drills synchronously with the carbide drill bit 1. The drill rod 3 connects to the drilling equipment and provides rotation and feed power for the entire device. The core barrel 4 is the core component for core collection. It contains core samples during drilling. The sliding seat 5 drives the core rod 6 to slide vertically inside the core barrel 4, realizing the switching between drilling and core sampling modes. The core rod 6 works with the core rod drill bit 7 to complete deep hole drilling and provide central guidance for the core barrel 4. The core rod drill bit 7 assists in breaking up the formation and enhances drilling efficiency. The locking component is used to fix the position of the sliding seat 5 to ensure the stability of the drilling or core sampling state. The cylindrical groove provides a space for the upper end of the sliding seat 5 and the core barrel 4, ensuring a compact component layout.

[0022] Reference Figure 6Both mounting slots have threaded holes on their inner walls that communicate with the cylindrical slots. The locking assembly includes two hexagon socket screws 8, which are threaded into the two threaded holes respectively. The length of the hexagon socket screws 8 is greater than the depth of the threaded holes. One end of one of the hexagon socket screws 8 is inserted into the positioning slot. The threaded holes provide a threaded installation channel for the hexagon socket screw 8, ensuring that the screw can accurately point to the sliding seat 5 in the cylindrical slot when it is turned. The hexagon socket screw 8 achieves extension and retraction of its end by turning. When one of the screws is inserted into the positioning slot, it can lock the position of the sliding seat 5 and prevent it from sliding during drilling or core taking. When the upper hexagon socket screw 8 is inserted into the positioning slot to lock the sliding seat 5, the core taking cylinder 4 and the core drilling rod 6 are in core taking mode. When the lower hexagon socket screw 8 is inserted into the positioning slot to lock the sliding seat 5, the core taking cylinder 4 and the core drilling rod 6 are in drilling mode. The design that the screw length is greater than the depth of the threaded hole ensures that the screw end can effectively extend into the positioning slot or retract completely without affecting the normal movement of the sliding seat 5.

[0023] Reference Figure 3 A guide rail 9 is vertically fixed inside the cylindrical groove. A limiting groove is opened on the side of the sliding seat 5. The guide rail 9 is slidably inserted into the limiting groove. The diameter of the sliding seat 5 is larger than the hole diameter of the core tube 4. The sliding seat 5 is located at the upper end of the core tube 4. One end of the guide rail 9 abuts against the upper end of the core tube 4. The cooperation between the guide rail 9 and the limiting groove provides precise guidance for the vertical sliding of the sliding seat 5, restricting the sliding seat 5 to move only along the axial direction, avoiding the core rod 6 from deviating and causing the drill to get stuck. The diameter of the sliding seat 5 is larger than the hole diameter of the core tube 4, which can limit its downward stroke and prevent the core rod drill bit 7 from going too deep into the core tube 4 and damaging the rock core sample. The guide rail 9 abuts against the upper end of the core tube 4, further fixing the position of the guide rail 9, and at the same time helping to limit the lowest position of the sliding seat 5, ensuring the precision and controllability of the core taking and drilling actions.

[0024] Reference Figure 4 and Figure 5 The lower end of the core rod 6 is provided with a movable groove, and the top of the movable groove is provided with a sliding groove. The mounting assembly includes a slider 10 that is vertically slidably installed in the sliding groove and a movable column 11 that is vertically slidably installed in the movable groove. The two ends of the movable column 11 are fixedly connected to the slider 10 and the core rod drill bit 7, respectively. The depth of the sliding groove is greater than the height of the slider 10. A rubber sealing ring 12 is fitted on the movable column 11. The upper and lower sides of the rubber sealing ring 12 are respectively attached to the lower end of the core rod 6 and the upper end of the core rod drill bit 7.

[0025] The cooperation between the groove and the slider 10 provides vertical sliding space for the moving column 11 and the core drill bit 7, allowing the core drill bit 7 to adapt to changes in formation hardness and provide slight buffering. The moving column 11 connects the slider 10 and the core drill bit 7, transmitting drilling pressure. The design of the groove depth being greater than the height of the slider 10 ensures that the slider 10 has sufficient sliding stroke to meet the buffering requirements of the core drill bit 7. The rubber sealing ring 12 fits tightly against the core rod 6 and the core drill bit 7, effectively preventing mud, sand, and gravel in complex formations from entering the gap between the core rod 6 and the core barrel 4, avoiding component wear or blockage. At the same time, it undergoes elastic deformation when the core drill bit 7 is under pressure, enhancing the sealing effect.

[0026] A counterweight 13 is fixedly installed on the upper surface of the sliding seat 5. The counterweight 13 is made of metal. The gravity of the counterweight 13 can assist the sliding seat 5 to slide down, reduce the operating force when switching modes, and make the switching between drilling and core taking smoother.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A core sampling device for deep-hole geological drilling in complex strata, characterized in that... The system includes a carbide drill bit (1) and an outer drill barrel (2), wherein the carbide drill bit (1) is installed at one end of the outer drill barrel (2) and a drill rod (3) is installed at the other end of the outer drill barrel (2). The outer drill barrel (2) is fixedly installed with a core barrel (4). The lower end of the drill rod (3) is provided with a cylindrical groove that communicates with the interior of the outer drill barrel (2). One end of the core barrel (4) extends into the cylindrical groove. A sliding seat (5) is vertically slidably installed in the cylindrical groove. A core rod (6) is vertically fixedly installed on the lower surface of the sliding seat (5). A core rod drill bit (7) is installed at the lower end of the core rod (6) through an installation assembly. The lower end of the core rod (6) is slidably inserted into the core barrel (4). The sliding seat (5) has a positioning groove on its side, and the drill rod (3) has two mounting grooves on its side. The two mounting grooves are equipped with locking components for locking the sliding seat (5).

2. The core sampling device for deep-hole geological drilling in complex strata according to claim 1, characterized in that, Both mounting slots have threaded holes that communicate with the cylindrical slots on their inner walls. The locking assembly includes two hexagon socket screws (8), which are threaded into the two threaded holes respectively.

3. The core sampling device for deep-hole geological drilling in complex strata according to claim 2, characterized in that, The length of the internal hexagon screw (8) is greater than the depth of the threaded hole, and one end of one of the internal hexagon screws (8) is inserted into the positioning groove.

4. The core sampling device for deep-hole geological drilling in complex strata according to claim 1, characterized in that, A guide rail (9) is vertically fixed inside the cylindrical groove. A limiting groove is opened on the side of the sliding seat (5), and the guide rail (9) is slidably inserted into the limiting groove.

5. The core sampling device for deep-hole geological drilling in complex strata according to claim 4, characterized in that, The diameter of the sliding seat (5) is larger than the aperture of the core tube (4). The sliding seat (5) is located at the upper end of the core tube (4). One end of the guide rail (9) abuts against the upper end of the core tube (4).

6. The core sampling device for deep-hole geological drilling in complex strata according to claim 1, characterized in that, The lower end of the core rod (6) is provided with a movable groove, and the top of the movable groove is provided with a sliding groove. The installation assembly includes a slider (10) that is vertically slidably installed in the sliding groove and a movable column (11) that is vertically slidably installed in the movable groove. The two ends of the movable column (11) are fixedly connected to the slider (10) and the core rod drill bit (7) respectively. The depth of the sliding groove is greater than the height of the slider (10).

7. A core sampling device for deep-hole geological drilling in complex strata according to claim 6, characterized in that, A rubber sealing ring (12) is fitted on the movable column (11), and the upper and lower sides of the rubber sealing ring (12) are respectively attached to the lower end of the core rod (6) and the upper end of the core rod drill bit (7).

8. The core sampling device for deep-hole geological drilling in complex strata according to claim 1, characterized in that, A counterweight (13) is fixedly installed on the upper surface of the sliding seat (5), and the counterweight (13) is made of metal.

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