Drilling tool for stable coring
By designing the bearing connection and multi-stage structure between the inner cylinder and the outer cylinder, the problem of core dispersion in the cracked rock layer is solved, stable core extraction is achieved, drilling tool consumption and load is reduced, and core application scope is expanded.
Patent Information
- Application Number
- CN202421050164.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-13
Smart Images
Figure CN222276624U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mechanical equipment and relates to a drilling tool for stable coring which improves the rock adaptability of a coring drill. Background Art
[0002] Cores are cylindrical rock samples taken from holes using annular drill bits and other coring tools based on the needs of geological work or engineering. Cores are important physical materials for studying and understanding underground geology and mineral conditions. For example, in the exploration and development of oil, gas fields and coal mines, coring tools are lowered into the well according to the stratum positions and designed depths obtained from the survey, and cores are drilled out to understand the underground oil layers and the characteristics of the fluids contained therein.
[0003] The conventional coring drilling process is to use a hollow coring drill barrel to coring the rock. For intact rock formations, the core in the hollow drill barrel will remain intact inside the drill barrel without breaking. There is a certain gap between the core and the inner wall of the drill barrel, which will not interfere with the normal coring drilling process. However, during the coring drilling process for rock formations with relatively developed fractures, due to rock fragmentation, the core will be scattered in the coring drill barrel during the drilling process, and will be driven by the coring drill barrel to rotate at high speed, and will have irregular collisions with the inner wall of the coring drill barrel, resulting in large vibrations during the coring process, large consumption of drilling tools, and even failure to perform normal coring drilling in severe cases. Utility Model Content
[0004] In view of this, an object of the present invention is to provide a drilling tool for stable coring to solve the problems raised in the background technology.
[0005] In order to achieve the above object, the utility model provides the following technical solutions:
[0006] A drilling tool for stable coring comprises an inner cylinder, an outer cylinder sleeved on the inner cylinder and a drill bit connected to one end of the outer cylinder, wherein the inner cylinder is connected to the outer cylinder for concentric rotation via a first bearing assembly arranged in the outer cylinder, and the outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder, and the inner diameter of the drill bit is smaller than the outer diameter of the inner cylinder, so as to axially limit the inner cylinder.
[0007] Furthermore, it also includes a push rod that passes through the outer cylinder and the inner cylinder along the axis of the inner cylinder, and a push plate is provided at one end of the push rod close to the drill bit, and the push rod and the push plate are coaxially rotatably connected through a second bearing assembly.
[0008] Furthermore, a stop ring is provided in the outer cylinder and arranged between the inner cylinder and the drill bit. The inner diameter of the stop ring is smaller than the outer diameter of the inner cylinder so as to limit the axial position of the inner cylinder.
[0009] Furthermore, the outer diameter of the pusher plate is less than or equal to the inner diameters of the drill bit, the stop ring and the inner tube, so that the pusher plate can move axially in the drill tool.
[0010] Furthermore, a positioning shoulder is provided at one end of the outer cylinder away from the drill bit to facilitate installation of the first bearing assembly, and a flange is provided at one end of the inner cylinder close to the positioning shoulder to facilitate connection of the inner cylinder to the first bearing assembly.
[0011] Furthermore, the outer cylinder and the inner cylinder can be configured as a multi-section structure and connected by threads.
[0012] Furthermore, the connection between the push rod and the outer cylinder is an outer hexagonal connecting rod, and the outer cylinder is provided with a corresponding inner hexagonal sleeve.
[0013] Furthermore, one end of the outer cylinder away from the drill bit is connected to an external driving device, so that the outer cylinder rotates under the action of the external driving device.
[0014] The beneficial effects of the utility model are:
[0015] The utility model provides a drilling tool for stable coring, which is provided with an outer cylinder rotatably connected to an inner cylinder and structurally restricts the inner cylinder, so that when coring is performed by the drilling tool for stable coring, the broken rock core is wrapped by the inner cylinder, and the inner cylinder and the outer cylinder freely rotate relative to each other through a first bearing assembly, the broken rock core will not be driven by the outer cylinder to rotate at a high speed, and the rotational collision load will not be transmitted to the outer cylinder through the first bearing assembly, and then to a driving device that drives the outer cylinder to rotate, so that the load of the driving device will not increase, the drilling tool will not be hit by the rock core, and the phenomenon of excessive load and drilling stagnation will not occur, thereby greatly improving the application range of the coring drilling tool and reducing the consumption of the drilling tool.
[0016] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:
[0018] Figure 1 It is a structural schematic diagram of a drilling tool for stable coring in the utility model;
[0019] Figure 2 for Figure 1 A partial enlarged view of part I in FIG.
[0020] Reference numerals: outer cylinder 1 , positioning shoulder 11 , inner cylinder 2 , drill bit 3 , cutter teeth 31 , push rod 4 , push plate 5 , stop ring 6 , first bearing assembly 7 , second bearing assembly 8 . DETAILED DESCRIPTION
[0021] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.
[0022] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0024] See also Figure 1-2 , is a drilling tool for stable coring, comprising an inner cylinder 2, an outer cylinder 1 sleeved on the inner cylinder 2, and a drill bit 3 connected to one end of the outer cylinder 1, the outer diameter of the inner cylinder 2 is smaller than the inner diameter of the outer cylinder 1, so that the inner cylinder 2 and the outer cylinder 1 form a gap connection, the inner diameter of the drill bit is smaller than the outer diameter of the inner cylinder 2, so as to axially limit the inner cylinder, and the inner cylinder 2 is connected to the outer cylinder 1 concentrically and rotatably through a first bearing assembly 7 arranged at an end of the outer cylinder 1 away from the drill bit.
[0025] Specifically, the inner diameter of the inner cylinder 2 is greater than or equal to the inner diameter of the drill bit 3, and one end of the inner cylinder 2 close to the drill bit 3 is an opening connected to the inner cavity of the drill bit, and the diameter of the opening is the inner diameter of the inner cylinder, so that the core in the drill bit 3 can smoothly enter the inner cylinder.
[0026] The drilling tool for stable coring also includes a push rod 4 which axially penetrates the outer cylinder and the inner cylinder along the inner cylinder 2, and a push plate 5 is provided at one end of the push rod 4 close to the drill bit 3, and the push rod 4 is coaxially rotatably connected to the push plate 5 through a second bearing assembly 8, and is rotatably connected to the inner cylinder 2.
[0027] Specifically, a stop ring 6 is provided in the outer cylinder 1 and arranged between the inner cylinder 2 and the drill bit 3 to limit the axial position of the inner cylinder 2, and the stop ring 6 is made of wear-resistant material to facilitate its contact and rotation connection with the inner cylinder 2.
[0028] The outer diameter of the push plate 5 is smaller than the inner diameter of the drill bit 3 and the stop ring 6, so that it can move axially in the drill tool for stable coring and play a role in pushing out the core; a cutter tooth 31 is provided at the end of the drill bit 3 away from the outer tube 1 to ensure the drilling of the drill tool for stable coring, and the inner diameter of the cutter tooth is smaller than the inner diameter of the inner tube and the drill bit, so that the core can smoothly enter the drill bit and the inner tube.
[0029] Preferably, a positioning shoulder 11 is provided at the end of the outer cylinder 1 away from the drill bit 3 to facilitate the installation of the first bearing assembly 7, and a flange is provided on the end of the inner cylinder close to the positioning shoulder 11 to facilitate the connection of the inner cylinder 2 to the first bearing assembly 7; specifically, the first bearing assembly 7 is composed of at least one bearing arranged along the axial direction, and the second bearing assembly 8 is also composed of at least one bearing arranged along the axial direction.
[0030] Preferably, the outer cylinder 1 and the inner cylinder 2 can be set as a multi-stage structure and connected by threads; the outer cylinder 1 and the drill bit 3 are connected by threads, and the threads on the outer cylinder 1 are internal threads.
[0031] Specifically, the connection between the push rod 4 and the outer cylinder 1 is an outer hexagonal connecting rod, and the outer cylinder 1 has a corresponding inner hexagonal sleeve. The push rod 4 and the inner cylinder 2 are gap-connected or linearly rotated through a movable bearing, so that the external drive device can drive the outer cylinder 1 to rotate through the push rod 3 without driving the inner cylinder 2 to rotate.
[0032] In another embodiment, one end of the outer cylinder 1 away from the drill bit is directly connected to an external driving device and rotates under the action of the external driving device.
[0033] Working principle of this stable coring drill:
[0034] Under the action of the external driving device, the drill tool for stable coring rotates forward under the action of the outer cylinder 1, and the core is separated from the rock formation and enters the drill bit under the action of the drill bit, and pushes the push plate and the push rod to move backward. As the drill tool continues to move forward, the core gradually passes through the drill bit 3 into the inner cylinder 2. At this time, the broken core is wrapped by the inner cylinder, and the inner cylinder and the outer cylinder can rotate freely relative to each other through the first bearing assembly. The broken core will not be driven to rotate at high speed, nor will the rotational collision load be transmitted to the outer cylinder through the first bearing assembly 7, and then transmitted to the external driving device that drives the outer cylinder to rotate. Therefore, it will not cause the load to increase, and the drill tool will not be blocked by the excessive core load, which greatly improves the applicability of the coring drill tool.
[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.
Claims
1. A drilling tool for stable coring, characterized in that: The invention comprises an inner cylinder, an outer cylinder sleeved on the inner cylinder and a drill bit connected to one end of the outer cylinder. The inner cylinder is connected to the outer cylinder for coaxial rotation via a first bearing assembly arranged in the outer cylinder. The outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder. The inner diameter of the drill bit is smaller than the outer diameter of the inner cylinder, so as to axially limit the inner cylinder.
2. The drilling tool for stable coring according to claim 1, characterized in that: It also includes a push rod which passes through the outer cylinder and the inner cylinder along the axis of the inner cylinder, and a push plate is provided at one end of the push rod close to the drill bit, and the push rod and the push plate are connected to rotate concentrically via a second bearing assembly.
3. The drilling tool for stable coring according to claim 2, characterized in that: A backstop ring is also provided in the outer cylinder and arranged between the inner cylinder and the drill bit. The inner diameter of the backstop ring is smaller than the outer diameter of the inner cylinder so as to limit the axial position of the inner cylinder.
4. The drilling tool for stable coring according to claim 3, characterized in that: The outer diameter of the pusher plate is less than or equal to the inner diameters of the drill bit, the stop ring and the inner tube, so that the pusher plate can move axially in the drill tool for stable coring.
5. The drilling tool for stable coring according to claim 1, characterized in that: A positioning shoulder is provided at one end of the outer cylinder away from the drill bit to facilitate installation of the first bearing assembly, and a flange is provided at one end of the inner cylinder close to the positioning shoulder to facilitate connection of the inner cylinder to the first bearing assembly.
6. The drilling tool for stable coring according to claim 1, characterized in that: The outer cylinder and the inner cylinder can both be arranged as a multi-section structure and connected by threads.
7. The drilling tool for stable coring according to claim 2, characterized in that: The connection between the push rod and the outer cylinder is an outer hexagonal connecting rod, and the outer cylinder is provided with a corresponding inner hexagonal sleeve.
8. The drilling tool for stable coring according to claim 1, characterized in that: One end of the outer cylinder away from the drill bit is connected to an external driving device, so that the outer cylinder rotates under the action of the external driving device.