Well wall corer convenient for drilling

Abstract

The utility model relates to the technical field of well wall coring devices, and discloses a well wall coring device convenient for drilling, which comprises a base column, a supporting assembly is arranged at the top of the base column, a coring assembly is arranged at the bottom of the base column, the coring assembly comprises a coring device body, a containing groove is formed in the side wall of the coring device body, and a coring hole is formed in the side wall of the coring device body. A plurality of positioning blocks are fixedly connected to the interior of the containing groove, a drill bit is slidably connected to the inner wall of the containing groove, a plurality of positioning grooves are formed in the drill bit, limiting balls are arranged on the two sides of the interior of each positioning block, limiting plates are fixedly connected to the side walls of the limiting balls, and limiting springs are arranged on the side edges of the limiting plates. In the utility model, the positioning groove at the bottom of a new drill bit is inserted after being aligned with the positioning block in the accommodating groove, and the limiting spring reversely pushes the limiting ball to reset after being in place, so that the limiting ball is clamped into the limiting hole in the side wall of the positioning groove to lock the drill bit, thereby achieving the effect of quickly replacing the drill bit, solving the problem that the drill bit of the traditional corer is complicated to replace, and improving the drilling operation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wellbore coring technology, and in particular to a wellbore coring device that is convenient for drilling. Background Technology

[0002] In fields such as petroleum and geological exploration, wellbore corers are key equipment for obtaining formation core samples, and their performance directly affects the efficiency and accuracy of exploration work. As exploration work advances to more complex formations, higher requirements are placed on the convenience and stability of corers.

[0003] Currently, common wellbore coring systems primarily use a single fixed drill bit for coring operations. The drill bit and the coring system body are mostly connected by welding or bolts. For downhole support, most rely on the coring system's own weight or simple suspension devices to maintain positional stability, lacking effective self-adaptive support structures. During operation, the drill bit rotates under the drive of the drill pipe, cutting through the wellbore rock, and the resulting core is stored in the core cylinder inside the coring system.

[0004] However, existing wellbore coring devices have significant drawbacks. On the one hand, the fixedly connected drill bit is difficult to replace quickly, and when the hardness of the formation rock changes, a lot of time is required to disassemble and replace the drill bit, which seriously affects drilling efficiency. On the other hand, the simple suspension support method cannot guarantee the stability of the coring device in complex downhole environments, and the device is prone to shaking, which can lead to coring failure. This increases exploration costs and reduces the accuracy of sample acquisition, failing to meet the needs of efficient and accurate modern exploration. Therefore, a wellbore coring device that is convenient for drilling is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a wellbore core sampler that facilitates drilling, aiming to improve the problem of cumbersome drill bit replacement in existing core samplers.

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

[0007] A wellbore coring tool that facilitates drilling includes a base column, a support assembly at the top of the base column, and a coring assembly at the bottom of the base column;

[0008] The core-retrieving assembly includes a core-retrieving body. A receiving groove is formed on the side wall of the core-retrieving body. Multiple positioning blocks are fixedly connected inside the receiving groove, and the positioning blocks are distributed in a circumferential pattern. A drill bit is slidably connected to the inner wall of the receiving groove. Multiple positioning slots are formed inside the drill bit, and the positioning slots and positioning blocks are matched in position. Multiple limiting holes are formed on both sides of the inner wall of the positioning slot, and the limiting holes are distributed in an array. Limiting balls are provided on both sides inside the positioning blocks. The outer walls of the limiting balls are slidably connected to the inner walls of the limiting holes. Limiting plates are fixedly connected to the side walls of the limiting balls. Limiting springs are provided on the sides of the limiting plates. One end of each limiting spring is fixedly connected inside the positioning block, and the other end of each limiting spring is fixedly connected to the side wall of the limiting plate.

[0009] As a further description of the above technical solution:

[0010] The outer wall of the core extractor is fixedly connected to a fixing seat, and the top of the fixing seat is fixedly connected to the bottom of the base column.

[0011] As a further description of the above technical solution:

[0012] The base column is fixedly connected to a number of connecting columns, which are arranged in a rectangular array, and a fixing plate is provided on the top of the connecting columns.

[0013] As a further description of the above technical solution:

[0014] Each of the connecting posts is fixedly connected to the bottom of the fixing plate at its top, and the fixing plate is fixedly connected to the top of the fixing plate with symmetrical hanging ears on the left and right.

[0015] As a further description of the above technical solution:

[0016] The support assembly includes multiple support plates, which are distributed in a circumferential shape on the outer wall of the base column. Each support plate has multiple connecting seats fixedly connected to its inner wall.

[0017] As a further description of the above technical solution:

[0018] An electric actuator is fixedly connected inside the base column, and a linkage block is fixedly connected to the output end of the electric actuator. The linkage block is located at the top of the base column.

[0019] As a further description of the above technical solution:

[0020] The connecting seat described above is rotatably connected to a rocker arm, and the other end of the rocker arm is rotatably connected to the inside of the linkage block.

[0021] As a further description of the above technical solution:

[0022] The connecting seat described below is rotatably connected to a connecting arm, and the other end of the connecting arm is rotatably connected to the base column.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, after aligning the bottom positioning groove of the new drill bit with the positioning block inside the receiving groove, it is inserted. After being inserted into place, the limiting spring pushes the limiting plate and the limiting ball back to reset, so that they are locked into the limiting hole on the side wall of the positioning groove to lock the drill bit. This achieves the effect of quick drill bit replacement, solves the problem of cumbersome drill bit replacement in traditional core extractors, and improves drilling operation efficiency.

[0025] 2. In this utility model, the electric thruster pushes the linkage block upward, and the linkage block drives multiple internal rocker arms to rotate, pushing the support plate outward. At the same time, the connecting arm assists in limiting the movement so that the support plate unfolds and contacts the well wall, achieving the effect of stable support for coring operations. This solves the problem of coring failure caused by device shaking during coring, and improves the stability and accuracy of coring operations. Attached Figure Description

[0026] Figure 1 A perspective view of a wellbore coring device that facilitates drilling, as proposed in this utility model;

[0027] Figure 2 An exploded view of the core sampler body structure of a wellbore core sampler that facilitates drilling, as proposed in this utility model;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the support plate structure of a wellbore core sampler that facilitates drilling, as proposed in this utility model.

[0030] Figure 5 This is a schematic diagram of the linkage block structure of a wellbore coring tool that facilitates drilling, as proposed in this utility model.

[0031] Legend:

[0032] 1. Base column; 2. Connecting column; 3. Fixing plate; 4. Hanging lug; 5. Fixing seat; 6. Core extractor body; 7. Drill bit; 8. Positioning groove; 9. Limiting hole; 10. Receiving groove; 11. Positioning block; 12. Limiting spring; 13. Limiting plate; 14. Limiting ball; 15. Support plate; 16. Connecting seat; 17. Connecting arm; 18. Rocker arm; 19. Electric actuator; 20. Linkage block. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figures 1-3This utility model provides one embodiment: a wellbore coring tool for convenient drilling uses a base column 1 as the basic load-bearing structure. The base column 1 is forged from high-strength alloy steel 42CrMo, and after tempering, its hardness reaches HRC35-40, possessing good compressive and torsional resistance. It is used to support the overall weight of the coring tool and transmit drilling power. A support component is set at the top of the base column 1 to maintain the stability of the coring tool. The coring component is set at the bottom of the base column 1, which serves as the core execution unit for realizing wellbore coring operations. The coring component has a coring tool body 6 as its main frame. The coring tool body 6 consists of a wear-resistant alloy steel outer shell and an internal power unit, etc., which is prior art and will not be described in detail here. The drill bit 7 has a milled groove 10 on its sidewall for mounting the drill bit 7. Multiple positioning blocks 11 are welded and fixedly connected inside the groove 10. These positioning blocks 11 are circumferentially distributed and made of cemented carbide YG8, possessing high hardness and wear resistance. They are used to precisely position the drill bit 7 by engaging with the positioning grooves 8 on the drill bit 7. The inner wall of the groove 10 slides against the drill bit 7. The drill bit 7 uses different materials depending on the drilling requirements (e.g., diamond composite material for hard rock, and cemented carbide material for soft rock). Multiple positioning grooves 8 are milled and precisely matched to the positioning blocks 11 for insertion. To achieve initial positioning, multiple limiting holes 9 are drilled on both sides of the inner wall of the positioning groove 8. These limiting holes 9 are arranged in an array and are used to engage with the limiting balls 14 to lock the drill bit 7. The inner sides of the positioning block 11 are milled and drilled to create mounting cavities for the limiting balls 14. The limiting balls 14 are made of GCr15 bearing steel, with a diameter of 8mm and a surface hardness of HRC60-62. Their outer walls slide against the inner walls of the limiting holes 9 to secure the drill bit 7. Each limiting ball 14 has a sidewall fixedly connected to a limiting plate 13 by welding. The limiting plate 13 is made of 304 stainless steel, stamped with a thickness of 2mm. The outer walls of the limiting plate 13 and the limiting balls 14... A sliding fit is formed with the guide groove inside the positioning block 11 to ensure the accurate movement direction of the limiting ball 14. A limiting spring 12 is provided on the side of the limiting plate 13. The limiting spring 12 is made of 65Mn spring steel with a wire diameter of 1.5mm. After heat treatment, the elastic coefficient is stable. One end is fixed to the spring seat preset inside the positioning block 11 by welding, and the other end is welded to the side wall of the limiting plate 13 to provide the reset elastic force for the limiting ball 14. A fixing seat 5 is fixedly connected to the outer wall of the core extractor body 6 by welding. The fixing seat 5 is made of 45 steel by machining. The top is fixedly connected to the bottom of the base column 1 by bolts to securely connect the core extractor body 6 and the base column 1 to ensure structural stability during core extraction.

[0035] Reference Figure 4 and Figure 5The base column 1 serves as the main support structure for the core sampler. Multiple connecting columns 2 are welded to the top of the column. These connecting columns 2 are made of 42CrMo alloy steel pipe with a diameter of 40mm and are arranged in a rectangular array. They are used to transmit lifting force and support the fixing plate 3. The top of the connecting columns 2 is bolted to the bottom of the fixing plate 3. The fixing plate 3 is made of 15mm thick Q345B steel plate with rust-proof treatment. It is used to install the mounting lugs 4 and provides an installation base for the support components. The top of the fixing plate 3 is welded to the left... The right-hand symmetrical lugs 4, forged from 35CrMo alloy steel, are used to connect with the hoisting ropes to achieve the hoisting operation of the core extractor. The support assembly is based on multiple support plates 15, which are made of 8mm thick high-strength Q690 steel plates and are distributed circumferentially on the outer wall of the base column 1 to contact the well wall and provide support. Each support plate 15 has multiple connecting seats 16 welded to its inner wall. The connecting seats 16 are made of 45# steel and machined to install the rocker arm 18 and the connecting arm 17, forming a transmission. The moving structure includes an electric actuator 19 bolted to the inside of the base column 1. The electric actuator 19 is an electro-hydraulic push rod with a high-strength aluminum alloy outer shell. It integrates a motor, hydraulic pump, and push rod mechanism to provide power to drive the linkage block 20. This is existing technology and will not be described in detail here. The output end of the electric actuator 19 is fixedly connected to the linkage block 20 via a pin. The linkage block 20, made of 42CrMo alloy steel, is located at the top of the base column 1 and converts the linear motion of the electric actuator 19 into the rotation of the rocker arm 18. The upper connecting seat 16... An internal rocker arm 18 is rotatably connected via a spherical bearing. The rocker arm 18 is welded from Q345B steel plate. The other end is rotatably connected to the internal linkage block 20 via a pin. This is used to convert the displacement of the linkage block 20 into the horizontal movement of the support plate 15. A connecting arm 17 is rotatably connected to the internal connecting seat 16 below via a cylindrical roller bearing. The connecting arm 17 is also welded from Q345B steel plate. The other end is rotatably connected to the internal base column 1 via a pin. This is used to assist the movement of the support plate 15 and provide a limiting function to ensure that the support plate 15 unfolds smoothly.

[0036] Working principle: When using this wellbore coring device, the operator first fixes the hoisting rope to the lug 4 on the top of the base column 1, and then hoists the entire device into the well. After reaching the predetermined position, the electric thruster 19 pushes the linkage block 20 to move upward. The displacement of the linkage block 20 causes the multiple rocker arms 18 connected inside to rotate, which in turn pushes the support plate 15 to move outward. The displacement of the support plate 15 also drives the connecting arm 17 to rotate. With the assistance and limitation of the connecting arm 17, the support plate 15 can unfold and contact the well wall, thereby achieving the effect of stabilizing the coring operation.

[0037] When it is necessary to change to a different drill bit 7, the operator first pulls the drill bit 7 out from one side of the core sampler body 6, and then aligns the positioning groove 8 at the bottom of the new drill bit 7 with the positioning block 11 inside the receiving groove 10 on one side of the core sampler body 6 and inserts it into it. During the insertion process, the limiting balls 14 on the left and right sides of the positioning block 11 are first squeezed by the side wall of the positioning groove 8, which in turn drives the limiting plate 13 to retract into the positioning block 11 and compresses the limiting spring 12. When the drill bit 7 is inserted into place, the limiting spring 12 pushes the limiting plate 13 and the limiting ball 14 back to reset, and the limiting ball 14 is locked into the limiting hole 9 on the side wall of the positioning groove 8, thereby completing the locking of the drill bit 7, thus achieving the effect of quickly changing to a different drill bit 7.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A convenient wellbore core sampler, comprising a base column (1), characterized in that: A support assembly is provided at the top of the base column (1), and a core extraction assembly is provided at the bottom of the base column (1); The core-retrieving assembly includes a core-retrieving body (6), the core-retrieving body (6) having a receiving groove (10) on its side wall, and a plurality of positioning blocks (11) fixedly connected inside the receiving groove (10), the positioning blocks (11) being distributed in a circumferential shape, a drill bit (7) slidably connected to the inner wall of the receiving groove (10), the drill bit (7) having a plurality of positioning grooves (8) inside, the positioning grooves (8) and the positioning blocks (11) being matched in position, and a plurality of limiting holes (9) being opened on both sides of the inner wall of the positioning grooves (8), the limiting holes being... The holes (9) are arranged in an array. Limiting balls (14) are provided on both sides of the inside of the positioning block (11). The outer walls of the limiting balls (14) are slidably connected to the inner walls of the limiting holes (9). Limiting plates (13) are fixedly connected to the side walls of the limiting balls (14). Limiting springs (12) are provided on the side of the limiting plates (13). One end of the limiting springs (12) is fixedly connected to the inside of the positioning block (11), and the other end of the limiting springs (12) is fixedly connected to the side wall of the limiting plates (13).

2. The wellbore coring tool for convenient drilling according to claim 1, characterized in that: The outer wall of the core extractor body (6) is fixedly connected to a fixing seat (5), and the top of the fixing seat (5) is fixedly connected to the bottom of the base column (1).

3. The wellbore coring tool for convenient drilling according to claim 1, characterized in that: The base column (1) is fixedly connected to a plurality of connecting columns (2), which are arranged in a rectangular array, and a fixing plate (3) is provided on the top of the connecting columns (2).

4. A wellbore coring tool for convenient drilling according to claim 3, characterized in that: The top of each of the connecting posts (2) is fixedly connected to the bottom of the fixing plate (3), and the top of the fixing plate (3) is fixedly connected with left and right symmetrical hanging ears (4).

5. A wellbore coring tool for convenient drilling according to claim 1, characterized in that: The support assembly includes multiple support plates (15), which are distributed in a circumferential shape on the outer wall of the base column (1). Each support plate (15) has multiple connecting seats (16) fixedly connected to its inner wall.

6. A wellbore coring tool for convenient drilling according to claim 5, characterized in that: An electric actuator (19) is fixedly connected inside the base column (1), and a linkage block (20) is fixedly connected to the output end of the electric actuator (19). The linkage block (20) is located at the top of the base column (1).

7. A wellbore coring tool for convenient drilling according to claim 5, characterized in that: The connecting seat (16) mentioned above is rotatably connected to a rocker arm (18), and the other end of the rocker arm (18) is rotatably connected to the inside of the linkage block (20).

8. A wellbore coring tool for convenient drilling according to claim 5, characterized in that: The connecting seat (16) below is rotatably connected to a connecting arm (17), and the other end of the connecting arm (17) is rotatably connected to the base column (1).

Images