A survey drill collar lifting structure

Abstract

The utility model discloses a kind of survey drilling rig casing hoisting structures, belong to survey drilling rig technical field. Including drilling rig, drill rod, casing, connecting column and inner support unit, the drill rod is connected with drilling rig and is used to open exploration hole on underground layer, one end of the connecting column is fixedly connected with drill rod, and the other end is connected with inner support unit;The casing is located in exploration hole, when the inner support unit enters casing and the inner wall of casing is resisted, the drill rod is lifted and can drive casing to move upwards.The utility model of a kind of survey drilling rig casing hoisting structure avoids using conventional reverse mode, in the case where casing has been stressed deformation or local jam, unintended tripping occurs, not only cannot unjam, but instead will lead to upper casing and lower drop pipe portion separate in advance, so that the casing section that is jammed or falls is completely left in the hole.

Description

Technical Field

[0001] This utility model relates to the field of drilling rig technology, specifically to a casing lifting structure for exploration drilling rigs. Background Technology

[0002] In fields such as geological exploration, mineral exploration, and geotechnical engineering, exploration drilling rigs are widely used for drilling sampling and formation detection. To ensure the stability of the drilling process, prevent borehole collapse, and ensure the smooth lowering and raising of the drill string, casing is usually run simultaneously during drilling. Casing, as a temporary or permanent retaining structure, is particularly important in complex geological formations.

[0003] However, in actual operations, sudden changes in geological conditions, improper operation, or equipment failure often lead to casing jamming, breakage, or even falling deep into the hole during drilling or hoisting. Once the casing is stuck in the rock layer or accidentally falls to the bottom of the hole, conventional forward rotation hoisting methods are often insufficient to effectively retrieve it. In such cases, operators typically attempt to reverse the drilling rig to uncouple or loosen the connections, trying to recover the casing section by section. However, existing casing connection structures are highly susceptible to unexpected disengagement under reverse torque, especially when the casing is already deformed or partially jammed. Reversing the rig not only fails to release the jam but can also cause the upper casing section to separate prematurely from the lower casing section, leaving the jammed or fallen casing section completely inside the hole, resulting in a serious accident.

[0004] Therefore, it is necessary to provide a casing lifting structure for exploration drilling rigs to solve the above problems. Utility Model Content

[0005] Based on the aforementioned problems in the existing technology, the purpose of this utility model is to provide a casing lifting structure for exploration drilling rigs to solve the problems mentioned in the background technology.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a casing lifting structure for an exploration drilling rig, including a drilling rig, a drill rod, a casing, a connecting column and an internal support unit. The drill rod is connected to the drilling rig for opening exploration holes in underground layers. One end of the connecting column is fixedly connected to the drill rod, and the other end is connected to the internal support unit. The casing is located in the exploration hole. When the inner support unit enters the casing, it abuts against the inner wall of the casing. When the drill pipe is lifted, it can drive the casing to move upward.

[0007] Furthermore, an extension rod extends downward from the bottom end of the connecting column, and the bottom end of the extension rod has a connecting ring. The outer diameter of the extension rod is smaller than the outer diameter of the connecting column. The inner support unit includes a sleeve, a driven link, a driving link, and a contact block. The inner diameter of the sleeve is larger than the inner diameter of the connecting column, and the driven link is located above the driving link. There are at least three abutment blocks arranged along the circumference of the sleeve. One end of the driven connecting rod is hinged to the outer wall of the sleeve, and the other end is hinged to the inner wall of the abutment block. One end of the driving connecting rod is hinged to the connecting ring, and the other end is hinged to the inner wall of the abutment block.

[0008] Furthermore, the connecting column also includes a spring and a locking block. A sliding cavity is formed in the connecting column in the radial direction. The locking block is slidably installed in the sliding cavity. One end of the spring abuts against the bottom of the sliding cavity, and the other end abuts against the bottom of the locking block. An opening is provided on the outer peripheral wall of the sleeve, the size of which matches the size of the locking block, and the locking block is located directly above the opening.

[0009] Furthermore, the inner support unit also includes a cover plate, and the sleeve is fixedly installed at the bottom of the cover plate, wherein the outer diameter of the cover plate is larger than the inner diameter of the sleeve.

[0010] Furthermore, the bottom of the cover plate is provided as an arc-shaped portion along the circumference.

[0011] The beneficial effects of this utility model are: The exploration drilling rig casing lifting structure provided by this utility model is that after the internal support unit is lowered, it docks with the upper end of the casing. After docking, it unfolds and abuts against its inner wall to fix the casing. It can automatically fix the casing after it is in place and then lift it out. This avoids the situation where the casing is deformed or partially jammed by the conventional reverse method, which may cause unexpected disengagement. Not only will it not be able to get rid of the jam, but it may also cause the upper casing and the lower casing to separate prematurely, resulting in the jammed or fallen casing section being completely left in the hole. By providing an arc-shaped portion on the cover plate, the friction between the inner support unit and the borehole wall is reduced during the descent process, preventing the abutment block from accidentally unfolding before the inner support unit reaches the end of the casing, thus ensuring the accuracy of the structure.

[0012] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0013] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a schematic diagram of the internal support unit of this utility model; Figure 3This is a front view schematic diagram of the internal support unit of this utility model; Figure 4 For the present utility model Figure 3 Schematic diagram of the cross section along line A in the middle; Figure 5 This is a schematic diagram of the resisting mechanism of this utility model; Figure 6 This is a schematic diagram of the extended locking block of this utility model; The following are the labeling elements in the figure: 1. Drilling rig; 2. Drill rod; 3. Underground layer; 31. Exploration hole; 4. Casing; 5. Connecting column; 501. Sliding cavity; 51. Extension rod; 52. Spring; 53. Clamping block; 54. Connecting ring; 6. Internal support unit; 61. Cover plate; 611. Arc-shaped part; 62. Sleeve; 621. Opening; 63. Driven connecting rod; 64. Driving connecting rod; 65. Abutment block. Detailed Implementation

[0014] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0016] like Figure 1-6 As shown, the present invention provides a technical solution: a casing lifting structure for an exploration drilling rig, including a drilling rig 1, a drill rod 2, a casing 4, a connecting column 5 and an inner support unit 6. The drill rod 2 is connected to the drilling rig 1 for opening an exploration hole 31 in the underground layer 3. One end of the connecting column 5 is fixedly connected to the drill rod 2, and the other end is connected to the inner support unit 6. The casing 4 is located in the exploration hole 31. When the inner support unit 6 enters the casing 4, it abuts against the inner wall of the casing 4. When the drill rod 2 is lifted, it can drive the casing 4 to move upward.

[0017] The bottom end of the connecting post 5 extends downward with an extension rod 51, and the bottom end of the extension rod 51 has a connecting ring 54. The outer diameter of the extension rod 51 is smaller than the outer diameter of the connecting post 5. The inner support unit 6 includes a sleeve 62, a driven link 63, a driving link 64, and an abutment block 65. The inner diameter of the sleeve 62 is larger than the inner diameter of the connecting column 5, and the driven link 63 is located above the driving link 64. There are at least three abutment blocks 65 arranged along the circumference of the sleeve 62. One end of the driven connecting rod 63 is hinged to the outer wall of the sleeve 62, and the other end is hinged to the inner wall surface of the abutment block 65. One end of the driving connecting rod 64 is hinged to the connecting ring 54, and the other end is hinged to the inner wall surface of the abutment block 65.

[0018] The connecting column 5 also includes a spring 52 and a locking block 53. A sliding cavity 501 is provided in the connecting column 5 in the radial direction. The locking block 53 is slidably installed in the sliding cavity 501. One end of the spring 52 abuts against the bottom of the sliding cavity 501, and the other end abuts against the bottom of the locking block 53. An opening 621 is provided on the outer peripheral wall of the sleeve 62. The size of the opening 621 matches that of the locking block 53, which is located directly above the opening 621.

[0019] The inner support unit 6 also includes a cover plate 61, and a sleeve 62 is fixedly installed at the bottom of the cover plate 61. The outer diameter of the cover plate 61 is larger than the inner diameter of the sleeve 4.

[0020] The bottom of the cover plate 61 is provided as an arc-shaped part 611 along the circumferential direction.

[0021] In one embodiment, how does this lifting structure work?

[0022] Specifically, when the casing 4 falls into or gets stuck in the exploration hole 31, the bottom of the drill rod 2 is fixedly connected to the connecting column 5, and the drill rod 2 is controlled to move downward by the drilling machine 1. At this time, the arc-shaped part 611 moves downward along the inner wall of the exploration hole 31. Due to the design of the arc-shaped part 611, the inner support unit 6 can fall down better, avoiding the cover plate 61 from getting stuck in the exploration hole 31. When the inner support unit 6 reaches the upper end of the casing 4, the cover plate 61 is stuck at the end of the casing 4. At this time, the drill rod 2 continues to descend, the cover plate 61 is limited to the casing 4, the connecting column 5 continues to descend, which drives the connecting ring 54 to continue to descend. At this time, under the drive of the active connecting rod 64, the abutment block 65 unfolds outward until it is in contact with the inner wall surface of the casing 4, and the connecting column 5 no longer descends. At the same time, as the connecting column 5 moves downward, the locking block 53 also moves downward. Under the influence of the spring force of the spring 52, when the upper surface of the locking block 53 is aligned with the opening 621, the elastic potential energy of the spring 52 is released, causing the locking block 53 to slide into the opening 621. At this time, the locking block 53 abuts against the opening 621, preventing the abutting block 65 from retracting inward, and causing the drill rod 2 to rise. The abutting block 65 abuts against the inner wall surface of the casing 4 and moves upward together.

[0023] In summary, this structure, by setting an inner support unit 6, descends and connects with the upper end of the sleeve 4. After the connection is completed, it unfolds and abuts against its inner wall to fix the sleeve 4. It can automatically fix the sleeve 4 after it is in place and then pull it out. This avoids the unexpected disengagement that occurs when the sleeve 4 is deformed or partially jammed by conventional reverse method. Not only will it fail to release the jam, but it will also cause the upper sleeve 4 to separate from the lower sleeve part in advance, resulting in the jammed or fallen sleeve 4 section being completely left in the hole. By providing an arc-shaped portion 611 on the cover plate 61, the friction between the inner support unit 6 and the wall of the exploration hole 31 can be reduced during the descent process, preventing the abutment block 65 from being mistakenly deployed before the inner support unit 6 has descended to the end of the casing 4, thus ensuring the accuracy of the structure.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A casing lifting structure for an exploration drilling rig, characterized in that: It includes a drilling rig (1), a drill rod (2), a casing (4), a connecting column (5), and an internal support unit (6). The drill rod (2) is connected to the drilling rig (1) to open an exploration hole (31) in the underground layer (3). One end of the connecting column (5) is fixedly connected to the drill rod (2), and the other end is connected to the internal support unit (6). The casing (4) is located in the exploration hole (31). When the inner support unit (6) enters the casing (4), it abuts against the inner wall of the casing (4). When the drill rod (2) is lifted, it can drive the casing (4) to move upward.

2. The casing lifting structure for exploration drilling rigs according to claim 1, characterized in that: The bottom end of the connecting post (5) extends downward with an extension rod (51), and the bottom end of the extension rod (51) has a connecting ring (54). The outer diameter of the extension rod (51) is smaller than the outer diameter of the connecting post (5). The inner support unit (6) includes a sleeve (62), a driven link (63), a driving link (64), and a contact block (65). The inner diameter of the sleeve (62) is larger than the inner diameter of the connecting column (5), and the driven link (63) is located above the driving link (64). There are at least three abutment blocks (65) arranged along the circumference of the sleeve (62). One end of the driven connecting rod (63) is hinged to the outer wall of the sleeve (62), and the other end is hinged to the inner wall of the abutment block (65). One end of the driving connecting rod (64) is hinged to the connecting ring (54), and the other end is hinged to the inner wall of the abutment block (65).

3. The casing lifting structure for exploration drilling rigs according to claim 2, characterized in that: The connecting column (5) also includes a spring (52) and a locking block (53). A sliding cavity (501) is provided in the connecting column (5) in the radial direction. The locking block (53) is slidably installed in the sliding cavity (501). One end of the spring (52) abuts against the bottom of the sliding cavity (501), and the other end abuts against the bottom of the locking block (53). An opening (621) is provided on the outer peripheral wall of the sleeve (62), the size of which matches the size of the locking block (53), and the locking block (53) is located directly above the opening (621).

4. The casing lifting structure for exploration drilling rigs according to claim 2, characterized in that: The inner support unit (6) also includes a cover plate (61), and the sleeve (62) is fixedly installed at the bottom of the cover plate (61). The outer diameter of the cover plate (61) is larger than the inner diameter of the sleeve (4).

5. The casing lifting structure for exploration drilling rigs according to claim 4, characterized in that: The bottom of the cover plate (61) is provided as an arc-shaped part (611) along the circumferential direction.

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