A recovery device suitable for a variety of survey casings

Abstract

The utility model provides a kind of recovery device suitable for multiple surveying casing. The recovery device includes main shaft, pull rod, limit baffle and casing clamping assembly, vertical slide hole is opened in main shaft upper part, pull rod is slidably installed in vertical slide hole;The casing clamping assembly is arranged in the lower part of main shaft, including connecting shaft and two half-moon or arc clamping blocks rotatably installed on connecting shaft, hollow clamping block receiving slot is opened in the lower part of main shaft, the connecting shaft is fixed in the bottom of clamping block receiving slot, spring is arranged between two clamping blocks, two clamping blocks are placed in clamping block receiving slot in retracted state, and are limited by limit baffle, the pull rod is respectively connected with two limit baffles by second pull rope.The utility model is moved on pulling limit plate, two clamping blocks are opened automatically, and are closely attached to casing wall, to achieve the purpose of pulling casing, and the fallen or broken casing can be efficiently and conveniently recycled.

Description

Technical Field

[0001] This utility model relates to the field of exploration casing recycling technology, specifically to a recycling device applicable to various exploration casings. Background Technology

[0002] Currently, in engineering geological drilling operations in loose formations, casing is often used for borehole protection. During drilling, casing may fall off, break during extraction, or detach at the joint. For these situations, casing recovery primarily involves using taps for extraction or abandoning the broken casing inside the borehole. However, existing technologies for recovering fallen or broken casing are complex, require numerous tools, and have a low success rate. There is an urgent market need for a method applicable to various exploration casing recovery methods that can efficiently and conveniently recover fallen or broken casing, effectively saving manpower, material resources, and financial costs. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a recovery device suitable for various types of exploration casings. It can efficiently and conveniently recover fallen or broken casings, and features high efficiency, convenience, cost-effectiveness, reliable performance, and wide applicability.

[0004] To achieve the above objectives, this utility model provides a recovery device suitable for various types of exploration casings. The recovery device includes a main shaft, a pull rod, a limiting baffle, and a casing clamping assembly installed at the lower part of the main shaft. The upper end of the main shaft is provided with a threaded joint for connection with a drill pipe. A vertical sliding hole is formed in the upper part of the main shaft. The pull rod passes horizontally through the vertical sliding hole and is slidably connected to it. A first pull rope is provided on the pull rod. The casing clamping assembly is located at the lower part of the main shaft and includes a connecting shaft and two crescent-shaped or arc-shaped clamping blocks rotatably mounted on the connecting shaft. A hollow clamping block receiving groove is correspondingly formed at the lower part of the main shaft. The connecting shaft passes horizontally through the clamping block receiving groove and is fixed to the bottom of the groove. The two clamping blocks... The device is mounted on a connecting shaft. A spring is installed between two snap-fit ​​blocks, with the spring sleeved on the connecting shaft. Both ends of the spring engage with the snap-fit ​​slots on the two snap-fit ​​blocks. In the normal spring state, the two snap-fit ​​blocks open horizontally and extend out of the snap-fit ​​block receiving slot. Two limiting baffles are provided, symmetrically arranged at the upper part of the slots on both sides of the snap-fit ​​block receiving slot. Vertical sliding grooves are symmetrically provided on both sides of the slot. The two limiting baffles are slidably installed in the vertical sliding grooves on both sides by sliders. The pull rod is connected to the two limiting baffles by a second pull rope. Under the action of external force, the two snap-fit ​​blocks compress the spring and retract into the snap-fit ​​block receiving slot, and are limited by the two limiting baffles. In the limited state, the two limiting baffles are placed at the lowest end of the vertical sliding groove. At this time, the pull rod is also located at the lowest end of the vertical sliding hole.

[0005] The preferred technical solution of this utility model is as follows: the concave surfaces of the two snap-fit ​​blocks face upwards, and multiple conical teeth are provided on the outer arc wall of each snap-fit ​​block.

[0006] A further technical solution of this utility model: when the pull rod slides upward along the vertical sliding hole, it drives the two limiting baffles to move upward along the vertical sliding groove, and the two locking blocks automatically pop out from the locking block storage groove.

[0007] A further technical solution of this utility model: When the recovery device is in use and installed on the exploration casing, the first pull rope extends upward along the inner or outer wall of the main shaft to the opening of the exploration borehole.

[0008] The preferred technical solution of this utility model is as follows: each side of the slot of the snap-fit ​​block storage groove is provided with two vertical sliding grooves, the two vertical sliding grooves are symmetrically arranged, and the limiting baffle is slidably connected to the two vertical sliding grooves through two sliders.

[0009] The beneficial effects of this utility model are as follows: This utility model, through the design of a joint and threaded connection with the drill rod, delivers the casing recovery structure to the location of the casing to be pulled out inside the borehole. The semi-circular wheel opens automatically due to the action of the spring and fits tightly against the casing wall, thereby achieving the purpose of pulling out the casing. It can efficiently and conveniently recover fallen or broken casings, and has the characteristics of high efficiency, convenience, cost saving, reliable performance and wide application range. Attached Figure Description

[0010] Figure 1 This is a front view of the snap-fit ​​block of this utility model in its unfolded state;

[0011] Figure 2 This is a side view of the snap-fit ​​block in its unfolded state according to this utility model;

[0012] Figure 3 This is a front view of the snap-fit ​​block of this utility model in its retracted state;

[0013] Figure 4 This is a side view of the snap-fit ​​block of this utility model in its retracted state;

[0014] Figure 5 This is a schematic diagram of the disassembled structure of the card connector in this utility model;

[0015] Figure 6 This is an enlarged schematic diagram of the conical teeth in this utility model;

[0016] Figure 7 This is a reference diagram showing the usage state of this utility model.

[0017] In the diagram: 1-Threaded connector; 2-Main spindle; 3-Pull rod; 4-Second pull rope; 5-Limiting plate; 6-Snap-fit ​​block; 7-Connecting shaft; 8-Spring; 9-Vertical sliding hole; 10-Snap-fit ​​block storage groove; 11-Vertical sliding groove; 12-First pull rope; 13-Conical tooth; 14-Exploration borehole; 15-Exploration casing; 16-Drill rod. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The embodiment provides a recovery device applicable to various types of exploration casing, such as Figures 1 to 6As shown, the recycling device includes a main shaft 2, a pull rod 3, a limiting baffle 5, and a sleeve clamping assembly installed at the lower part of the main shaft 2. The upper end of the main shaft 2 is provided with a threaded joint 1 for connecting with the drill pipe. A vertical sliding hole 9 is opened in the upper part of the main shaft 2. The pull rod 3 passes horizontally through the vertical sliding hole 9 and is slidably connected with the vertical sliding hole 9. A first pull rope 12 is provided on the pull rod 3. The sleeve clamping assembly is located at the lower part of the main shaft 2. The sleeve clamping assembly includes a connecting shaft 7 and two crescent-shaped or arc-shaped clamping blocks 6 rotatably installed on the connecting shaft 7. A hollow clamping block receiving groove 10 is correspondingly opened at the lower part of the main shaft 2. The connecting shaft 7 passes horizontally through the clamping block receiving groove 10 and is fixed. Two snap-fit ​​blocks 6 are symmetrically arranged on the connecting shaft 7 at the bottom of the snap-fit ​​block storage groove 10. A spring 8 is provided between the two snap-fit ​​blocks 6 and is sleeved on the connecting shaft 7. The two ends of the spring 8 are respectively snapped into the slots on the two snap-fit ​​blocks 6. When the spring 8 is in normal state, the two snap-fit ​​blocks 6 are horizontally opened and extended out of the snap-fit ​​block storage groove 10. Two limiting baffles 5 are provided and are symmetrically arranged at the upper part of the slots on both sides of the snap-fit ​​block storage groove 10. Vertical sliding grooves 11 are symmetrically provided on both sides of the slots of the snap-fit ​​block storage groove 10. Two vertical sliding grooves 11 are provided on each side of the slot of the snap-fit ​​block storage groove 10. The two vertical sliding grooves 11 are symmetrically arranged. The limiting baffles 5 are slidably connected to the two vertical sliding grooves 11 through two sliders. Two limiting baffles 5 are slidably installed in the vertical slide grooves 11 on both sides via sliders. The pull rod 3 is connected to the two limiting baffles 5 via the second pull rope 4. Under the action of external force, the two locking blocks 6 compress the spring 8 and retract into the locking block receiving groove 10, and are limited by the two limiting baffles 5. In the limited state, the two limiting baffles 5 are placed at the lowest end of the vertical slide groove 11. At this time, the pull rod 3 is also located at the lowest end of the vertical slide hole 9. The concave surfaces of the two locking blocks 6 face upward, and multiple conical teeth 13 are provided on the outer arc wall of each locking block 6.

[0022] In the embodiment, the recycling device, in its operating state, such as Figure 7 As shown, after being installed on the exploration casing 15, the first pull rope 12 extends upward along the inner or outer wall of the main shaft 2 to the opening of the exploration borehole 14. When the pull rod 3 slides upward along the vertical sliding hole 9, it drives the two limit baffles 5 to move upward along the vertical sliding groove 11, and the two locking blocks 6 automatically pop out from the locking block storage groove 10.

[0023] If the exploration casing sinks and falls due to loose strata, this utility model can be used for casing extraction and recovery. The extraction process of this utility model is further explained below with reference to specific embodiments. The specific usage process is as follows:

[0024] S1. First, the depth of the fallen casing is measured manually; if the casing remains in the hole due to breakage, the depth of the remaining casing 15 in the borehole is estimated based on the length of the extracted casing.

[0025] S2. Connect the recycling device of this utility model to the drill rod 16 through the connector and install it on the drilling machine; and put the two locking blocks 6 of the casing recycling device into the locking block storage groove 10, and limit them by the limiting baffle 5 to prevent the locking blocks 6 from popping out.

[0026] S3. Use a drilling rig to lower the drill rod 16 with the casing recovery device into the exploration borehole 14. According to the casing depth measured in S1, lower the casing recovery structure into the casing to be recovered. The casing recovery device should be lowered to about 30-50cm below the casing opening.

[0027] S4. After the casing retrieval device is lowered to the designated position, the first pull rope 12 is manually pulled at the orifice. The pull rope 12 pulls the pull rod 3, causing it to move upwards along the vertical sliding hole 9. During this upward movement, the second pull rope 4 raises the limiting baffle 5. Figure 3 and Figure 4 As shown, after the limit baffle 5 is raised, the two locking blocks 6 are automatically released under the action of the spring 8 and closely adhere to the inner wall of the exploration sleeve 15. At this time, under the action of the spring force, the tip of the conical tooth 13 on the outer side of the locking block 6 is embedded into the inner wall of the sleeve, which can effectively increase the friction between the locking block 6 and the sleeve wall.

[0028] S5. Use the drilling rig power system to pull the drill rod 16 upward. The greater the upward pulling force, the greater the friction between the clamping block 16 and the exploration casing 15, thus achieving the effect of pulling out the exploration casing 15.

[0029] S6. After the casing is recovered, the casing recovery device is pushed down manually. During the downward push, the two locking blocks 16 slowly close, and the casing recovery device can be taken out of the exploration casing 15 for recovery.

[0030] In this embodiment, the pressure required for the conical teeth 13 to press into the sleeve sidewall can be calculated using the following formula. Based on the calculated minimum pressure, a spring is customized to ensure that the conical teeth can be embedded in the sleeve wall when the half-moon wheel pops out.

[0031] The formula for calculating the pressure of the tapered tooth 13 pressed into the casing sidewall is:

[0032]

[0033] Where F is the pressure N exerted by the pyramidal cutting teeth pressing into the side wall of the casing;

[0034] K is a constant coefficient, which is generally taken as 1.5~1.8 considering the contact gap and the mechanical properties of the material;

[0035] S — Shear strength of the material (N / mm²) 2 );

[0036] C — Tensile strength of the material (N / mm2)

[0037] t — the cone indentation depth (mm);

[0038] δ — the diameter (mm) of the corresponding position of the pressed cone.

[0039] In this embodiment, the maximum torsion spring reaction force of the preset snap-fit ​​block 6 is 4kN, with an action angle of 135°; the pressing depth t of the five preset pyramids is 1-2mm; the diameter of the corresponding position of the pressed-in pyramid is 2-4mm; the shear strength S of the Q460 steel on the sidewall of the casing is 235MPa; the tensile strength C of the Q460 steel on the sidewall of the casing is 550MPa; the coefficient constant K is taken as 1.8 for safety. Therefore, the pressure F of the conical teeth pressing into the sidewall of the casing is F = 5 * 1 * 2 * 235N = 2.35kN.

[0040] In this embodiment, the outer wall resistance of the casing is related to the formation. Based on slightly dense sandy soil, the standard value of the side friction resistance qsk is 70 kPa. With a casing outer diameter of 120 mm and a burial depth of 6 m, the side friction resistance value FN = 70 * π * 0.12 * 6 kN = 158.26 kN. Force analysis shows that the casing can be pulled out when the lower limit of the pull-out force is 158.26 kN.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A recovery device applicable to various types of exploration casing, characterized in that: The recovery device includes a main shaft (2), a pull rod (3), a limiting baffle (5), and a sleeve clamping assembly installed at the lower part of the main shaft (2). The upper end of the main shaft (2) is provided with a threaded joint (1) for connecting with the drill pipe. A vertical sliding hole (9) is opened in the upper part of the main shaft (2). The pull rod (3) passes horizontally through the vertical sliding hole (9) and is slidably connected with the vertical sliding hole (9). A first pull rope (12) is provided on the pull rod (3). The sleeve clamping assembly The assembly is located at the lower part of the main shaft (2). The sleeve clamping assembly includes a connecting shaft (7) and two crescent-shaped or arc-shaped clamping blocks (6) rotatably mounted on the connecting shaft (7). A hollow clamping block storage groove (10) is correspondingly opened at the lower part of the main shaft (2). The connecting shaft (7) passes horizontally through the clamping block storage groove (10) and is fixed at the bottom of the clamping block storage groove (10). The two clamping blocks (6) are symmetrically arranged on the connecting shaft (7). Between the two clamping blocks (6) A spring (8) is provided, which is sleeved on the connecting shaft (7). Both ends of the spring (8) are respectively engaged with the slots on the two locking blocks (6). When the spring (8) is in normal state, the two locking blocks (6) are horizontally opened and extended out of the locking block receiving groove (10). Two limiting baffles (5) are provided, which are symmetrically arranged on the upper part of the slots on both sides of the locking block receiving groove (10). Vertical sliding grooves (11) are symmetrically provided on both sides of the slots of the locking block receiving groove (10). The two limiting baffles (5) are respectively The slider is installed in the vertical groove (11) on both sides. The pull rod (3) is connected to the two limiting baffles (5) respectively through the second pull rope (4). Under the action of external force, the two snap blocks (6) compress the spring (8) and retract into the snap block storage groove (10), and are limited by the two limiting baffles (5). The two limiting baffles (5) are placed at the bottom of the vertical groove (11) in the limited state. At this time, the pull rod (3) is also located at the bottom of the vertical sliding hole (9).

2. The recovery device for various types of exploration casings according to claim 1, characterized in that: The concave surfaces of the two snap-fit ​​blocks (6) face upwards, and multiple conical teeth (13) are provided on the outer arc wall of each snap-fit ​​block (6).

3. A recovery device applicable to various exploration casings according to claim 1 or the present invention, characterized in that: When the pull rod (3) slides upward along the vertical sliding hole (9), it drives the two limit baffles (5) to move upward along the vertical sliding groove (11), and the two snap blocks (6) automatically pop out from the snap block storage groove (10).

4. A recovery device applicable to various exploration casings according to claim 1 or the present invention, characterized in that: When the recovery device is in use and installed on the exploration casing (15), the first pull rope (12) extends upward along the inner or outer wall of the main shaft (2) to the opening of the exploration borehole (14).

5. A recovery device applicable to various exploration casings according to claim 1, characterized in that: The slot (10) for receiving the snap-fit ​​block has two vertical sliding grooves (11) on each side. The two vertical sliding grooves (11) are symmetrically arranged. The limiting baffle (5) is slidably connected to the two vertical sliding grooves (11) through two sliders.

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