Oil exploration equipment and exploration methods

Abstract

The present invention provides an oil exploration device and an exploration method, which relate to the technical field of oil exploration, and include a drilling rig structure, a drilling structure, a core bit, a transmission structure and a pulling structure. A containing cavity is communicated with a containing space; the drilling structure is connected to the drilling rig structure, and one end of the drilling structure is arranged in the containing cavity, and the other end penetrates through the drilling rig structure; the core bit is connected to the drilling rig structure, and the core bit is accommodated in the containing space, and the core bit is connected to the drilling structure through the transmission structure; the pulling structure is connected to the drilling rig structure and arranged in the containing cavity, and the pulling structure is connected to the drilling structure; the pulling structure is used for pulling the drilling structure to move along the containing cavity, and the drilling structure is used for driving the core bit to move through the transmission structure, so that the core bit penetrates out of the drilling rig structure. The present invention alleviates the technical problem in the prior art that when core sampling operation is carried out, it is necessary to take out the conventional bit and replace it with a core bit, which makes the core sampling operation relatively inconvenient.

Description

Technical Field

[0001] The present invention relates to the technical field of oil exploration, and in particular to oil exploration equipment and an exploration method. Background Art

[0002] Petroleum exploration refers to the process of finding and identifying oil and gas resources by using various exploration methods to understand the underground geological conditions, understand the conditions of oil generation, oil storage, oil and gas migration, accumulation, and preservation, comprehensively evaluate the oil and gas prospects, determine favorable areas for oil and gas accumulation, find oil and gas storage closures, and explore the area of oil and gas fields, and understand the conditions of oil and gas layers and production capacity; coring is an important link in petroleum exploration, which can provide geologists with direct samples of the formation so as to conduct detailed analysis of the generation, migration and storage conditions of oil and gas. Petroleum exploration coring equipment is a drilling tool specially used to extract core samples from underground.

[0003] Existing coring equipment for oil exploration includes a coring drill bit and a drilling rig. The drilling rig is the power source for the entire coring operation. It provides rotation, pressure and lifting force to drive the coring equipment. The coring drill pipe is connected to the end of the drill pipe of the drilling rig. The drill pipe is a pipe that transmits rotation and pressure. It transmits the power of the ground drilling rig to the coring drill bit. The coring drill bit is a key part of the coring equipment. A blade with a special structure is designed at its end. The coring drill bit can cut and capture the core as the drilling rig moves forward.

[0004] At present, when using existing oil exploration coring equipment to drill cores, before reaching the coring layer, it is necessary to first use a conventional drill bit to drill, and then take out the conventional drill bit after reaching the coring layer, and replace the conventional drill bit with a coring drill bit to perform the coring operation again. This method makes the coring process more complicated and leads to slower coring efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a petroleum exploration device and an exploration method to alleviate the technical problem in the prior art that when performing a coring operation, a conventional drill bit needs to be taken out and replaced with a coring drill bit, thereby causing the coring operation to be inconvenient.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a petroleum exploration equipment, including a drilling rig structure, a drilling structure, a coring drill bit, a transmission structure and a pulling structure, wherein the drilling rig structure is provided with a receiving cavity and a receiving space, and the receiving cavity is communicated with the receiving space;

[0008] The drilling structure is connected to the drilling rig structure, and one end of the drilling structure is arranged in the accommodating cavity, and the other end passes through the drilling rig structure;

[0009] The core bit is structurally connected to the drilling rig, and the core bit is accommodated in the accommodation space. The core bit is connected to the drilling structure through the transmission structure;

[0010] The pulling structure is connected to the drilling rig structure and is disposed in the accommodation cavity, and the pulling structure is connected to the drilling structure;

[0011] The pulling structure is used to move the drilling structure along the accommodation cavity, and the drilling structure is used to drive the core bit to move through the transmission structure, so that the core bit penetrates out of the drilling rig structure.

[0012] Further, the drilling structure includes a drilling bit, a bit mounting assembly, and a pulling assembly. The bit mounting assembly is disposed in the accommodation cavity and is connected to the drilling rig structure. One end of the bit mounting assembly is connected to the drilling bit, and the other end is connected to the pulling assembly;

[0013] One end of the pulling assembly away from the bit mounting assembly is connected to the pulling structure, and the pulling assembly is used to push the transmission structure to move, and then push the core bit out of the drilling rig structure through the transmission structure.

[0014] Further, the bit mounting assembly includes a bit mounting seat and a first ratchet wheel. One end of the bit mounting seat is connected to the drilling bit, and the other end is connected to the pulling assembly;

[0015] The first ratchet wheel is connected to the bit mounting seat;

[0016] The transmission structure includes a transmission block and a first pawl. The first pawl is connected to the transmission block, and the first pawl is used to pass through the drilling rig structure and then engage with the first ratchet wheel, so that the transmission block is fixed relative to the drilling rig structure.

[0017] Further, the drilling rig structure is provided with a first abutting block at the cavity wall of the accommodation cavity;

[0018] The bit mounting seat is provided with a second abutting block, and the bit mounting seat is connected to the first abutting block through the second abutting block.

[0019] Further, the pulling assembly includes a pulling block and a steel chain. The pulling block is connected to the bit mounting seat through the steel chain, and the pulling block is connected to the pulling structure;

[0020] The pulling block is provided with a first wedge surface;

[0021] The transmission block is provided with a third wedge surface that fits with the first wedge surface;

[0022] During the movement of the pulling block, the pulling block pushes the transmission block to move, and the transmission block pushes the core bit to extend out of the drilling rig structure, and synchronously drives the first pawl to separate from the first ratchet wheel.

[0023] Further, the core bit is provided with a second wedge surface;

[0024] The transmission block is further provided with a fourth wedge surface that fits with the second wedge surface.

[0025] Further, the oil exploration equipment further includes a limiting structure, the limiting structure is connected to the drilling rig structure, and the limiting structure is used for being in limiting connection with the transmission structure after the pulling block pushes the transmission structure to move.

[0026] Further, the limiting structure includes a connecting piece and a second pawl, the connecting piece is connected to the drilling rig structure, and the connecting piece is connected to the second pawl;

[0027] The transmission structure further includes a second ratchet wheel, the second ratchet wheel is connected to the transmission block, and the second ratchet wheel is engaged with the second pawl.

[0028] Further, the drilling rig structure includes a threaded drill pipe and a mounting sleeve, one end of the threaded drill pipe is provided with the mounting sleeve, and the other end of the threaded drill pipe is used for being connected to an external driving structure;

[0029] The threaded drill pipe is provided with the accommodation cavity, and the threaded drill pipe is connected to the pulling structure;

[0030] The mounting sleeve is provided with the accommodation space, and the mounting sleeve is connected to the core bit and the limiting structure.

[0031] In a second aspect, the present invention provides an exploration method for an oil exploration equipment, including:

[0032] S1. After rotating the drilling rig structure and driving the drilling structure to drill underground to the core-taking layer position, stop drilling;

[0033] S2. The pulling structure drives the drilling structure to move in a direction away from the core-taking layer, the drilling structure pushes the transmission structure during the movement, and the transmission structure drives the core bit to extend out of the drilling rig structure;

[0034] S3. Perform core-taking treatment through the core bit, and enable the core sample to enter the accommodation cavity of the drilling rig structure.

[0035] The embodiments of the present invention can achieve the following beneficial effects:

[0036] In a first aspect, the present invention provides an oil exploration device, comprising a drilling rig structure, a drilling structure, a core bit, a transmission structure and a pulling structure. The drilling rig structure is provided with a receiving cavity and a receiving space, and the receiving cavity communicates with the receiving space; the drilling structure is connected to the drilling rig structure, and one end of the drilling structure is disposed in the receiving cavity and the other end passes through the drilling rig structure; the core bit is connected to the drilling rig structure and is received in the receiving space, and the core bit is connected to the drilling structure through the transmission structure; the pulling structure is connected to the drilling rig structure and is disposed in the receiving cavity, and the pulling structure is connected to the drilling structure; the pulling structure is used to pull the drilling structure to move along the receiving cavity, and the drilling structure is used to drive the core bit to move through the transmission structure, so that the core bit passes through the drilling rig structure.

[0037] In the present invention, the drilling rig structure includes a threaded drill pipe, and a receiving cavity is formed along its extending direction therein. Preferably, this receiving cavity is a cylindrical space. The pulling structure includes a driving assembly and a pulling rope. Among them, the driving assembly includes a driving motor, a driving shaft and a rotating wheel. The driving motor is connected to the inner cavity wall of the threaded drill pipe, and the output end of the driving motor is provided with a driving shaft along the radial direction of the threaded drill pipe, and the other end of the driving shaft is rotatably connected to the inner wall of the threaded drill pipe. A rotating wheel is provided on the driving shaft, and the rotating wheel is preferably disposed at the axis of the threaded drill pipe. A pulling rope is wound around the rotating wheel. During use, the driving motor drives the driving shaft and the rotating wheel to rotate, so that the pulling rope is wound around the rotating wheel or released from the rotating wheel. The other end of the pulling rope is connected to the drilling structure, that is, the drilling structure can be lifted along the extending direction of the receiving cavity through the pulling rope. During the lifting process of the drilling structure, the drilling structure pushes the transmission structure along the radial direction, so that the transmission structure pushes the core structure along the axial direction, so that the core structure passes through the drilling rig structure. After the drilling structure is retracted, the core bit extends out of the drilling rig structure to take core from the core layer, so that the taken core enters the receiving cavity.

[0038] Compared with the prior art, the oil exploration device provided by the present invention pulls the drilling structure through the pulling structure disposed in the threaded drill pipe, so that the drilling structure enters the receiving cavity. During the movement of the drilling structure, the core bit is driven to extend out of the drilling rig structure through the transmission structure, so as to achieve the use effect of replacing the drilling structure with the core structure.

[0039] In summary, the present invention at least alleviates the technical problem that in the prior art, when taking core, it is necessary to take out the conventional bit and replace it with a core bit, which makes the core-taking operation relatively inconvenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic diagram of the overall structure of the oil exploration equipment provided by the embodiment of the present invention in the drilling state;

[0042] Figure 2 It is a schematic diagram of the overall structure of the oil exploration equipment provided by the embodiment of the present invention in the coring state;

[0043] Figure 3 It is a schematic diagram of the partial structure of the oil exploration equipment provided by the embodiment of the present invention in the drilling state;

[0044] Figure 4 It is Figure 3 an enlarged schematic diagram of the structure of part A in

[0045] Figure 5 It is a partial structure cross-sectional view of the drill pipe part of the oil exploration equipment provided by the embodiment of the present invention.

[0046] Icon: 1 - drilling rig structure; 11 - threaded drill pipe; 111 - accommodating cavity; 112 - first abutting block; 113 - groove body; 1131 - wedge key; 12 - installation sleeve; 121 - accommodating space; 2 - drilling structure; 21 - drilling bit; 22 - bit installation assembly; 221 - bit installation seat; 2211 - second abutting block; 222 - first ratchet; 23 - pulling assembly; 231 - pulling block; 2311 - first wedge surface; 232 - steel chain; 3 - coring bit; 31 - second wedge surface; 4 - transmission structure; 41 - transmission block; 411 - third wedge surface; 412 - fourth wedge surface; 42 - second ratchet; 43 - first pawl; 5 - pulling structure; 51 - driving assembly; 511 - driving shaft; 512 - rotating wheel; 52 - pulling rope; 6 - limiting structure; 61 - connecting piece; 62 - second pawl. Specific Embodiments

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0048] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0049] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0050] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0051] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0052] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The following will describe in detail some embodiments of the present invention in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0054] Embodiment 1

[0055] This embodiment provides an oil exploration device. Refer to Figure 1 and Figure 2, the oil exploration equipment includes a drilling rig structure 1, a drilling structure 2, a core bit 3, a transmission structure 4, and a pulling structure 5. The drilling rig structure 1 is provided with a receiving cavity 111 and a receiving space 121, and the receiving cavity 111 communicates with the receiving space 121; the drilling structure 2 is connected to the drilling rig structure 1, and one end of the drilling structure 2 is disposed in the receiving cavity 111, and the other end passes through the drilling rig structure 1; the core bit 3 is connected to the drilling rig structure 1, and the core bit 3 is received in the receiving space 121, and the core bit 3 is connected to the drilling structure 2 through the transmission structure 4; the pulling structure 5 is connected to the drilling rig structure 1 and disposed in the receiving cavity 111, and the pulling structure 5 is connected to the drilling structure 2; the pulling structure 5 is used to pull the drilling structure 2 to move along the receiving cavity 111, and the drilling structure 2 is used to drive the core bit 3 to move through the transmission structure 4, so that the core bit 3 passes through the drilling rig structure 1.

[0056] The embodiment of the present invention at least alleviates the technical problem in the prior art that when performing a core sampling operation, it is necessary to remove the conventional drill bit and replace it with a core bit, which makes the core sampling operation relatively inconvenient.

[0057] In the embodiment of the present invention, the drilling rig structure 1 includes a threaded drill pipe 11, and a receiving cavity 111 is provided along its extending direction. That is, this receiving cavity 111 is preferably a cylindrical space. The pulling structure 5 includes a driving component 51 and a pulling rope 52. Among them, the driving component 51 includes a driving motor, a driving shaft 511, and a rotating wheel 512. The driving motor is connected to the inner cavity wall of the threaded drill pipe 11, and the output end of the driving motor is provided with a driving shaft 511 along the radial direction of the threaded drill pipe 11. The other end of the driving shaft 511 is rotatably connected to the inner wall of the threaded drill pipe 11, and a rotating wheel 512 is provided on the driving shaft 511. The rotating wheel 512 is preferably disposed at the axis of the threaded drill pipe 11, and a pulling rope 52 is wound around the rotating wheel 512. During use, the driving motor drives the driving shaft 511 and the rotating wheel 512 to rotate, so that the pulling rope 52 is wound around the rotating wheel 512 or released from the rotating wheel 512. The other end of the pulling rope 52 is connected to the drilling structure 2, that is, the drilling structure 2 can be lifted along the extending direction of the receiving cavity 111 through the pulling rope 52. During the lifting process of the drilling structure 2, the drilling structure 2 pushes the transmission structure 4 in the radial direction, so that the transmission structure 4 pushes the core bit 3 in the axial direction, so that the core bit 3 passes through the drilling rig structure 1. After the drilling rig structure 1 is retracted, the core bit 3 extends out of the drilling rig structure 1 to take a core from the core sampling layer, so that the taken core enters the receiving cavity 111.

[0058] Compared with the prior art, the oil exploration equipment provided by the embodiment of the present invention pulls the drilling structure 2 through the pulling structure 5 arranged in the screw drill pipe 11, so that the drilling structure 2 enters the accommodation cavity 111. During the movement of the drilling rig structure 1, the core bit 3 is driven to extend from the drilling rig structure 1 through the transmission structure 4, so as to achieve the use effect of replacing the drilling structure 2 with the core bit 3.

[0059] In an optional implementation manner of this embodiment, referring to Figure 3 , the drilling structure 2 includes a drilling bit 21, a bit mounting assembly 22 and a pulling assembly 23. The bit mounting assembly 22 is arranged in the accommodation cavity 111 and connected to the drilling rig structure 1. One end of the bit mounting assembly 22 is connected to the drilling bit 21, and the other end is connected to the pulling assembly 23; the end of the pulling assembly 23 away from the bit mounting assembly 22 is connected to the pulling structure 5, and the pulling assembly 23 is used to push the transmission structure 4 to move, and then the core bit 3 is pushed out of the drilling rig structure 1 through the transmission structure 4.

[0060] Specifically: One end of the bit mounting assembly 22 is connected to the drilling bit 21, and the other end is connected to the pulling assembly 23. In the drilling state, both the bit mounting assembly 22 and the pulling assembly 23 are arranged in the accommodation cavity 111, and the drilling bit 21 is arranged outside the drilling rig structure 1; when the coring layer position is drilled, the pulling assembly 23 is pulled up by the pulling rope 52 of the pulling structure 5, so that the pulling assembly 23 pushes the transmission structure 4 to move, and then the transmission structure 4 pushes the core bit 3 out of the accommodation space 121 of the drilling rig structure. As the pulling assembly 23 is continuously pulled, it also drives the bit mounting assembly 22 and the drilling bit 21 to move in the direction of the pulling structure 5.

[0061] Further, referring to Figure 3 , the bit mounting assembly 22 includes a bit mounting seat 221 and a first ratchet 222. One end of the bit mounting seat 221 is connected to the drilling bit 21, and the other end is connected to the pulling assembly 23; the first ratchet 222 is connected to the bit mounting seat 221; the transmission structure 4 includes a transmission block 41 and a first pawl 43. The first pawl 43 is connected to the transmission block 41, and the first pawl 43 is used to pass through the drilling rig structure 1 and engage with the first ratchet 222 to fix the transmission block 41 relative to the drilling rig structure 1.

[0062] Specifically, the drill bit mounting base 221 is symmetrically provided with first ratchets 222. There can be two or four first ratchets 222, and at least two first ratchets 222 are provided on one side surface of the drill bit mounting base 221. The transmission structure 4 can be one set or two sets. The transmission block 41 is provided with a first pawl 43, and the first pawl 43 is inclined at a specific angle to facilitate meshing with the corresponding first ratchet 222. Since the first ratchet 222 can only rotate in one direction, the first ratchet 222 can be fixed by the first pawl 43. Two first ratchets 222 are simultaneously fixed by the corresponding first pawls 43 to prevent the drilling structure 2 from moving in the direction of the pulling structure 5 through the first pawls 43.

[0063] Further, referring to Figure 4 , the drilling rig structure 1 is provided with a first abutting block 112 at the cavity wall of the accommodating cavity 111; the drill bit mounting base 221 is provided with a second abutting block 2211, and the drill bit mounting base 221 is connected to the first abutting block 112 through the second abutting block 2211.

[0064] Specifically, the inner cavity wall of the threaded drill pipe 11 is provided with a first abutting block 112. Preferably, one end of the first abutting block 112 is connected to the threaded drill pipe 11 through a spring, and the bottom surface of the first abutting block 112 is provided with a wedge surface. During use, the first abutting block 112 abuts against the second abutting block 2211 on the side wall of the drill bit mounting base 221 to support the drill bit mounting base 221 after the first abutting block 112 abuts against the second abutting block 2211. When the drilling structure 2 moves in the direction of the pulling structure 5, the drill bit mounting assembly 22 pushes the first abutting block 112 to move into the threaded drill pipe 11 after compressing the spring.

[0065] In an alternative embodiment of the present embodiment, referring to Figure 3 , the pulling assembly 23 includes a pulling block 231 and a steel chain 232. The pulling block 231 is connected to the drill bit mounting base 221 through the steel chain 232, and the pulling block 231 is connected to the pulling structure 5; the pulling block 231 is provided with a first wedge surface 2311; the transmission block 41 is provided with a third wedge surface 411 that fits the first wedge surface 2311; when the pulling block 231 moves, it pushes the transmission block 41 to move, and the transmission block 41 pushes the core drill bit 3 to extend out of the drilling rig structure 1 and simultaneously drives the first pawl 43 to separate from the first ratchet 222.

[0066] Specifically, a steel chain 232 is provided at the bottom of the pulling block 231, and the other end of the steel chain 232 is connected to the drill bit mounting assembly 22. A first wedge surface 2311 is provided on the side of the pulling block 231, and the transmission block 41 is provided with a third wedge surface 411 that fits the first wedge surface 2311. During use, by moving the pulling block 231, the transmission block 41 is pushed away. At this time, the first pawl 43 is separated from the first ratchet wheel 222 to release the limit on the drilling structure 2. After the pulling block 231 moves a certain distance, the steel chain 232 is tightened, and then the steel chain 232 pulls the drill bit mounting assembly 22 and the drilling bit 21 together.

[0067] Further, referring to Figure 4 , the core bit 3 is provided with a second wedge surface 31; the transmission block 41 is further provided with a fourth wedge surface 412 that fits the second wedge surface 31.

[0068] Specifically, the core bit 3 is provided with a second wedge surface 31, and the transmission block 41 is further provided with a fourth wedge surface 412 that fits the second wedge surface 31. During use, by moving the transmission block 41 radially, the fourth wedge surface 412 abuts against the second wedge surface 31. When the transmission block 41 continues to move, the core bit 3 is pushed to move along the axial direction of the threaded drill pipe 11.

[0069] In an alternative embodiment of the present embodiment, referring to Figure 3 , the oil exploration equipment further includes a limiting structure 6. The limiting structure 6 is connected to the drilling rig structure 1 and is used for limiting connection with the transmission structure 4 after the pulling block 231 pushes the transmission structure 4 to move.

[0070] Specifically, the limiting structure 6 is connected to the inner wall of the mounting sleeve 12 of the drilling rig structure 1 and is arranged in the accommodating space 121. After the pulling block 231 pushes the transmission structure 4 to move, the transmission structure 4 is connected to the limiting structure 6, thereby realizing the limitation of the transmission structure 4, so that the transmission structure 4 can continuously press the core bit 3, and thus the core bit 3 is continuously located outside the drilling rig structure 1.

[0071] Further, referring to Figure 3 , the limiting structure 6 includes a connecting member 61 and a second pawl 62. The connecting member 61 is connected to the drilling rig structure 1 and is connected to the second pawl 62; the transmission structure 4 further includes a second ratchet wheel 42. The second ratchet wheel 42 is connected to the transmission block 41 and is engaged with the second pawl 62.

[0072] Specifically, the connecting member 61 is connected to the inner wall of the mounting sleeve 12, and a second ratchet pawl 62 is provided on the connecting member 61. The second ratchet pawl 62 is used to engage with the second ratchet wheel 42 when the transmission block 41 approaches the connecting member 61, thereby fixing the transmission block 41 relative to the connecting member 61, and further keeping the transmission block 41 in a state of continuously abutting against the core bit 3, so that the exploration device is in the core-taking state.

[0073] Further, referring to Figure 1 or Figure 2 , the drilling rig structure 1 includes a threaded drill pipe 11 and a mounting sleeve 12. One end of the threaded drill pipe 11 is provided with a mounting sleeve 12, and the other end of the threaded drill pipe 11 is used to connect to an external driving structure; the threaded drill pipe 11 is provided with a receiving cavity 111, and the threaded drill pipe 11 is connected to the pulling structure 5; the mounting sleeve 12 is provided with a receiving space 121, and the mounting sleeve 12 is connected to the core bit 3 and the limiting structure 6.

[0074] Specifically: One end of the threaded drill pipe 11 is provided with a mounting sleeve 12. The mounting sleeve 12 is sleeved on the outside of the threaded drill pipe 11, and the outer wall of the mounting sleeve 12 is provided with threads; and the mounting sleeve 12 is slidably connected to the core bit 3 and fixedly connected to the limiting structure 6, while the transmission structure 4 is accommodated between the mounting sleeve 12 and the threaded drill pipe 11.

[0075] It should be particularly noted that, referring to Figure 5 , a groove 113 is formed on the inner wall of the threaded drill pipe 11, and a wedge key 1131 is provided in the groove 113, and the wedge key 1131 is provided with an inclined surface; during use, when the core is lifted, the inclined core can sink into the groove formed by the wedge key 1131 to clamp the core.

[0076] Embodiment 2

[0077] This embodiment provides an exploration method for an oil exploration device, including:

[0078] S1. Rotate the drilling rig structure 1 and drive the drilling structure 2 to drill underground to the core-taking layer position, and then stop drilling;

[0079] S2. The pulling structure 5 drives the drilling structure 2 to move in a direction away from the core-taking layer. During the movement of the drilling structure 2, it pushes the transmission structure 4, and the transmission structure 4 drives the core bit 3 to extend out of the drilling rig structure 1;

[0080] S3. Core-taking treatment is performed through the core bit 3, and the core sample enters the receiving cavity 111 of the drilling rig structure 1.

[0081] Specifically: during use, first, the drilling bit 21 is drilled into the coring layer underground by rotating the drilling rig structure 1, and then the drilling structure 2 is lifted by the pulling structure 5. During the lifting process of the drilling structure 2, it drives the transmission structure 4 to move, and then the transmission structure 4 drives the coring bit 3 to move downward until it extends out of the installation sleeve 12. At this time, the switching from the drilling state to the coring state is realized. Since the drilling structure 2 is continuously lifted, space is vacated in the accommodating cavity 111 for the taken core. During the coring process, the taken core enters the accommodating cavity 111 and is retained therein.

[0082] Finally, it should be noted that: the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other; the above embodiments in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil exploration device, characterized in that, It includes a drilling rig structure (1), a drilling structure (2), a core bit (3), a transmission structure (4), and a pulling structure (5). The drilling rig structure (1) is provided with a receiving cavity (111) and a receiving space (121), and the receiving cavity (111) communicates with the receiving space (121). The drilling structure (2) is connected to the drilling rig structure (1), and one end of the drilling structure (2) is arranged in the receiving cavity (111), and the other end passes through the drilling rig structure (1). The drilling structure (2) includes a drilling bit (21), a bit mounting assembly (22), and a pulling assembly (23). The bit mounting assembly (22) is arranged in the receiving cavity (111) and is connected to the drilling rig structure (1). One end of the bit mounting assembly (22) is connected to the drilling bit (21), and the other end is connected to the pulling assembly (23). One end of the pulling assembly (23) away from the bit mounting assembly (22) is connected to the pulling structure (5), and the pulling assembly (23) is used to push the transmission structure (4) to move, and then the core bit (3) is pushed out of the drilling rig structure (1) through the transmission structure (4). The bit mounting assembly (22) includes a bit mounting seat (221) and a first ratchet wheel (222). The transmission structure (4) includes a transmission block (41) and a first pawl (43). The first pawl (43) is connected to the transmission block (41), and the first pawl (43) is used to pass through the drilling rig structure (1) and then engage with the first ratchet wheel (222) to fix the transmission block (41) relative to the drilling rig structure (1). The pulling assembly (23) includes a pulling block (231) and a steel chain (232). The pulling block (231) is connected to the bit mounting seat (221) through the steel chain (232), and the pulling block (231) is connected to the pulling structure (5). The pulling block (231) is provided with a first wedge surface (2311). The transmission block (41) is provided with a third wedge surface (411) that fits the first wedge surface (2311). The core bit (3) is provided with a second wedge surface (31). The transmission block (41) is further provided with a fourth wedge surface (412) that fits the second wedge surface (31). The core bit (3) is connected to the drilling rig structure (1), and the core bit (3) is accommodated in the receiving space (121). The core bit (3) is connected to the drilling structure (2) through the transmission structure (4). The pulling structure (5) is connected to the drilling rig structure (1) and is arranged in the receiving cavity (111), and the pulling structure (5) is connected to the drilling structure (2). The pulling structure (5) is used to pull the drilling structure (2) to move along the receiving cavity (111), and the drilling structure (2) is used to drive the core bit (3) to move through the transmission structure (4) so that the core bit (3) passes through the drilling rig structure (1).

2. The oil exploration equipment according to claim 1, characterized in that, One end of the drill bit mounting seat (221) is connected to the drilling bit (21), and the other end is connected to the pulling assembly (23). The first ratchet wheel (222) is connected to the drill bit mounting seat (221).

3. The oil exploration equipment according to claim 2, characterized in that, The drilling rig structure (1) is provided with a first abutting block (112) at the cavity wall of the accommodating cavity (111). The drill bit mounting seat (221) is provided with a second abutting block (2211), and the drill bit mounting seat (221) is connected to the first abutting block (112) through the second abutting block (2211).

4. The petroleum exploration equipment according to claim 2, wherein During the movement of the pulling block (231), the driving block (41) is pushed to move, and the driving block (41) pushes the core drill bit (3) to extend out of the drilling rig structure (1), and simultaneously drives the first pawl (43) to separate from the first ratchet wheel (222).

5. The oil exploration equipment according to claim 4, characterized in that, It further includes a limiting structure (6), the limiting structure (6) is connected to the drilling rig structure (1), and the limiting structure (6) is used for being connected to the transmission structure (4) in a limiting manner after the pulling block (231) pushes the transmission structure (4) to move.

6. The oil exploration equipment according to claim 5, wherein, The limiting structure (6) includes a connecting member (61) and a second pawl (62), the connecting member (61) is connected to the drilling rig structure (1), and the connecting member (61) is connected to the second pawl (62). The transmission structure (4) further includes a second ratchet wheel (42), the second ratchet wheel (42) is connected to the driving block (41), and the second ratchet wheel (42) is engaged with the second pawl (62).

7. The oil exploration equipment according to claim 6, characterized in that, The drilling rig structure (1) includes a threaded drill pipe (11) and a mounting sleeve (12), one end of the threaded drill pipe (11) is provided with the mounting sleeve (12), and the other end of the threaded drill pipe (11) is used for being connected to an external driving structure. The threaded drill pipe (11) is provided with the accommodating cavity (111), and the threaded drill pipe (11) is connected to the pulling structure (5). The mounting sleeve (12) is provided with the accommodating space (121), and the mounting sleeve (12) is connected to the core drill bit (3) and the limiting structure (6).

8. The exploration method of the oil exploration equipment according to claim 1, characterized in that, Including: S1. Rotate the drilling rig structure (1) and drive the drilling structure (2) to drill underground to the core-taking layer position, and then stop drilling. S2. The pulling structure (5) drives the drilling structure (2) to move in a direction away from the core-taking layer. During the movement of the drilling structure (2), the transmission structure (4) is pushed, and the transmission structure (4) drives the core drill bit (3) to extend out of the drilling rig structure (1). S3. Perform core-taking treatment through the core drill bit (3), and make the core sample enter the accommodating cavity (111) of the drilling rig structure (1).

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