Dismounting tool for lower adjusting sleeve of small-size drill collar

Abstract

The utility model provides a small-size drill collar lower adjusting sleeve dismounting tool which can meet the dismounting requirement of a deep hole small-size adjusting sleeve and comprises an extension rod and a drawing head, the extension rod is a long and thin rod body, the first end of the extension rod is connected with an adapter, and the first end face of the adapter is provided with an assembling groove in the direction of the central axis. The length of the assembling groove is larger than or equal to the diameter of the adapter, the assembling groove divides the adapter into two symmetrical rotating seats, and first rotating pin assembling holes are formed in the rotating seats; the drawing head comprises a connecting part and drawing parts arranged on the two sides of the connecting part, a second rotating pin assembling hole is formed in the connecting part, and after the rotating pin is sequentially assembled in the first rotating pin assembling hole, the second rotating pin assembling hole and the first rotating pin assembling hole, the whole drawing head can rotate within a certain range based on the adapter.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling tool maintenance technology, and more specifically, to a tooling for disassembling the lower adjusting sleeve of a small drill collar. Background Technology

[0002] In oil drilling operations, the upper and lower adjusting sleeves inside the drill collar are prone to wear due to long-term alternating loads, requiring regular disassembly and maintenance. However, the lower adjusting sleeve presents at least the following technical challenges that cause traditional disassembly tools to fail: the lower adjusting sleeve is located deep within the drill collar bore (≥1m), making it impossible for conventional tools to effectively reach and engage it; furthermore, the lower adjusting sleeve has a fragile structure, with a wall thickness of only 3-4mm, making it impossible to machine threads or withstand excessive disassembly forces; and the downhole environment can easily cause the adjusting sleeve to adhere to the drill collar inner wall, posing a risk of jamming.

[0003] In existing technologies, hydraulic pullers are too large to fit properly, which can easily cause deformation of the adjusting sleeve or damage to the tool. Therefore, there is an urgent need for a special tooling that combines deep hole compatibility, mechanical controllability, and structural protection. Utility Model Content

[0004] The purpose of this utility model is to provide a tooling for disassembling the lower adjusting sleeve of a small-sized drill collar, which can overcome three major technical obstacles: tooling insertion guidance, reliable locking, and graded force application.

[0005] The embodiments of this utility model are implemented as follows:

[0006] A disassembly fixture for a small-sized drill collar lower adjusting sleeve includes an extension rod and a puller head. The extension rod is a slender rod with its first end connected to an adapter. The first end face of the adapter has an assembly groove along its central axis. The length of the assembly groove is greater than or equal to the diameter of the adapter. The assembly groove divides the adapter into two symmetrical rotating seats, each with a first rotating pin assembly hole. The puller head includes a connecting part and puller parts located on both sides of the connecting part. The connecting part has a second rotating pin assembly hole. The rotating pin is sequentially assembled into the first rotating pin assembly hole, the second rotating pin assembly hole, and the first rotating pin assembly hole, allowing the puller head to rotate within a certain range based on the adapter.

[0007] In a preferred embodiment of the present invention, the assembly groove includes two vertical sides, a first horizontal bottom surface, an inclined bottom surface, and a second horizontal bottom surface. The two vertical sides are respectively located on two rotating seats, and the first horizontal bottom surface and the second horizontal bottom surface are respectively located on two open sides of the assembly groove. The distance between the first horizontal bottom surface and the end face is less than the distance between the second horizontal bottom surface and the end face. The first horizontal bottom surface and the second horizontal bottom surface are connected by the inclined bottom surface.

[0008] In a preferred embodiment of the present invention, the connecting part and the pulling part are integrally formed block structures, the thickness of the connecting part is greater than the thickness of the pulling part, the connecting part and the pulling part have an arc transition, and the top and bottom of the pulling head are flat.

[0009] In a preferred embodiment of this utility model, the end of the pull-out portion is arc-shaped.

[0010] In a preferred embodiment of the present invention, the second end face of the adapter is provided with a snap-fit ​​groove, and the first end of the extension rod is provided with a snap-fit ​​part that matches the shape of the snap-fit ​​groove.

[0011] In a preferred embodiment of this utility model, an ultrasonic transducer is embedded inside the adapter, and the ultrasonic transducer is communicatively connected to a handheld control terminal.

[0012] In a preferred embodiment of this utility model, the extension rod is a segmented threaded connection extension rod.

[0013] In a preferred embodiment of the present invention, the second end of the extension rod is provided with a head, which is detachably connected to the extension rod.

[0014] In a preferred embodiment of this utility model, the aforementioned end is threadedly connected to the extension rod.

[0015] In a preferred embodiment of the present invention, the aforementioned lower adjustment sleeve disassembly fixture further includes a slider, which is sleeved on the extension rod and can slide on the extension rod.

[0016] The beneficial effects of this utility model embodiment are:

[0017] 1. Through the linkage design of the rotatable pull head and the extension rod, the lower adjustment sleeve with a depth of more than 1m can be accurately engaged, breaking through the limitation of traditional tools that are difficult to reach into narrow channels;

[0018] 2. The rotation trajectory of the pull head is limited by the assembly groove, and it can automatically lock into the groove of the adjustment sleeve to form a self-locking fixing structure, thereby improving disassembly efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the small-sized drill collar lower adjusting sleeve disassembly tooling assembled on the drill collar lower adjusting sleeve according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the adapter structure according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the adapter and puller assembly structure according to an embodiment of the present invention;

[0023] Icons: Extension rod 1; Pull head 2; Connecting part 21; Pulling part 22; Second rotating pin mounting hole 23; Adapter 3; Mounting groove 31; Vertical side 311; First horizontal bottom surface 312; Inclined bottom surface 313; Second horizontal bottom surface 314; Rotary seat 32; First rotating pin mounting hole 33; Snap-fit ​​groove 34; End 4; Slider 5; Rotating pin 6; Lower adjusting sleeve 7. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, 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 to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply 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 tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0030] First Embodiment

[0031] Please see Figure 1 This embodiment provides a small-sized drill collar lower adjustment sleeve disassembly tool, which is especially suitable for the quick disassembly and assembly of thin-walled lower adjustment sleeves with an outer diameter of less than 100mm, an installation depth of more than 1m and no threads that can be machined. It includes an extension rod 1 and a rotatable pull head 2. The overall tooling weight is controlled below 2.8kg, and a single person can complete the entire operation process.

[0032] Extension rod 1 is a slender rod with a length of 1.1-1.5m. The rod is made of 17-4PH stainless steel and the surface of the rod is sandblasted.

[0033] The first end of the extension rod 1 is connected to the adapter 3. The first end face of the adapter 3 is provided with an assembly groove 31 along the central axis. The length of the assembly groove 31 is greater than or equal to the diameter of the adapter 3, so that the assembly groove 31 divides the adapter 3 into two symmetrical rotating seats 32. The rotating seats 32 are provided with a first rotating pin assembly hole 33 for assembling the rotating pin.

[0034] For details, please see Figure 2 The assembly groove 31 includes two vertical sides 311, a first horizontal bottom surface 312, an inclined bottom surface 313, and a second horizontal bottom surface 314. The two vertical sides 311 are respectively located on two rotating seats 32. The first horizontal bottom surface 312 and the second horizontal bottom surface 314 are respectively located on two open sides of the assembly groove 31. The distance from the first horizontal bottom surface 312 to the end face is less than the distance from the second horizontal bottom surface 314 to the end face. The first horizontal bottom surface 312 and the second horizontal bottom surface 314 are connected by the inclined bottom surface 313. The angle between the inclined bottom surface 313 and the horizontal plane is 45°±2°, and the groove depth tolerance is ±0.05mm.

[0035] The assembly slot 31 adopts an asymmetrical stepped assembly slot design with a slot depth tolerance of ±0.05mm. Combined with 17-4PH stainless steel material, it achieves a bending strength of 150MPa while maintaining the thin-walled structure of the rotating seat 32.

[0036] Please see Figure 3 The pull head 2 includes a connecting part 21 and a pull part 22 disposed on both sides of the connecting part 21. The connecting part 21 is provided with a second rotating pin assembly hole 23. After the rotating pin 6 is sequentially assembled into the first rotating pin assembly hole 33, the second rotating pin assembly hole 23 and the first rotating pin assembly hole 33, the pull head 2 as a whole can rotate within a certain range based on the adapter 3.

[0037] The connecting part 21 and the drawing part 22 are integrally formed block structures. The thickness of the connecting part 21 is greater than the thickness of the drawing part 22. The connecting part 21 and the drawing part 22 have an arc transition. The top and bottom of the drawing head 2 are flat. The drawing head 2 adopts variable cross-section topology optimization as a whole, reducing the stress concentration factor to 1.2 and increasing the fatigue life by 3 times.

[0038] The end of the drawing part 22 is arc-shaped, and the arc transition edge design reduces the contact stress by 40%. Combined with surface sandblasting treatment (Ra3.2), the anti-slip effect is further improved.

[0039] The second end face of the adapter 3 is provided with a snap-fit ​​groove 34, and the first end of the extension rod 1 is provided with a snap-fit ​​part 11 that matches the structural shape of the snap-fit ​​groove 34. The specific form of the snap-fit ​​is not limited, and existing snap-fit ​​structures can be directly used, with a coaxiality ≤0.1mm / m. The adapter 3 and the extension rod 1 adopt a quick-change snap-fit ​​structure to achieve 3-second component replacement, and are compatible with the Φ70-100mm lower adjustment sleeve 7 specification.

[0040] The second end of the extension rod 1 is provided with a head 4, which is detachably connected to the extension rod 1. In this embodiment, the head 4 is threadedly connected to the extension rod 1. In this embodiment, the connection is made with an M24×1.5 fine thread for use in slide hammer impact operations.

[0041] Furthermore, the disassembly fixture for the lower adjusting sleeve 7 also includes a slider 5, which is fitted onto the extension rod 1 and can slide on the extension rod 1. Dual-mode power output: In normal operation, direct pulling (≤200N) is used; in special jamming conditions, a sliding hammer impact mode is activated (maximum impact force up to 1200N), achieving graded force application; the mass of the slider 5 and the length of the extension rod 1 are dynamically matched to ensure effective transfer of impact energy (energy conversion efficiency exceeding 85%).

[0042] Second Embodiment

[0043] This embodiment uses a lower adjusting sleeve 7 with a diameter of 75mm and an inner diameter of 71mm as an example. A groove with an inscribed circle diameter of 72mm (0~+0.2mm) and an inner diameter of 73mm is machined inside the lower adjusting sleeve 7. The diameter of the pulling head 2 is designed to be 72mm (0~-0.2mm). This ensures that the pulling head 2 of the lower adjusting sleeve 7 can rotate around the rotating pin 6 and enter the groove, and also ensures that the pulling head 2 of the lower adjusting sleeve 7 can be stuck in the groove.

[0044] The usage method is as follows:

[0045] The puller head 2 is assembled onto the adapter 3 using the rotating pin 6. The extension rod 1 is snapped into the adapter 3. Holding the extension rod 1, the tool is inserted into the inner hole of the adjusting sleeve until it contacts the groove of the lower adjusting sleeve 7.

[0046] Rotate the extension rod 1 clockwise to lock the pull head 2 into the groove of the adjusting sleeve, and then slowly pull the extension rod 1 along the axial direction to pull out the lower adjusting sleeve 7.

[0047] When there is sticky, stuck mud and sludge, and the lower adjusting sleeve 7 cannot be pulled out:

[0048] After assembling the extension rod 1, adapter 3, and pull head 2, install the slider 5 and end 4 onto the extension rod 1 in sequence. The slider 5 can be slid on the extension rod 1 multiple times and hit the end 4 to loosen the top of the adjusting sleeve. Then, pull the extension rod 1 to remove it.

[0049] Third Embodiment

[0050] This embodiment further optimizes or modifies the structure of the first embodiment, for example:

[0051] Extension rod 1 adopts a segmented threaded connection extension rod, and the length of each segment can be customized, such as 0.5m / segment. It is connected by a high-strength alloy threaded joint, which can adapt to different depths (≥1m) and reduce the space occupied during transportation and storage.

[0052] An ultrasonic transducer with a frequency of 28kHz and an amplitude of 50μm can also be embedded inside the adapter. This transducer generates axial high-frequency micro-vibrations through piezoelectric ceramics, disrupting the oxide bonding layer between the adjusting sleeve and the inner wall of the drill collar. It activates synchronously with the pulling action, reducing the static friction coefficient by over 60%. The ultrasonic transducer is equipped with a wireless transmission unit, exchanging data with a handheld terminal via the ZigBee protocol, allowing the handheld terminal to control the ultrasonic transducer.

[0053] Multi-stage self-aligning guide rings can also be added to the front end of the extension rod. For example, a tapered guide head (15° cone angle) can be designed at the first stage for coarse positioning; an elastic petal-type guide flap can be designed at the second stage to accommodate a bore diameter tolerance of ±0.3mm; and a ball bearing guide sleeve can be designed at the third stage to ensure that the coaxiality between the pull-out head and the adjusting sleeve is ≤0.05mm, thereby achieving self-adaptive centering guidance.

[0054] In summary, this utility model addresses the technical challenge of machining threads on the small-sized adjusting sleeve 7, which is difficult to remove. A disassembly fixture is specifically designed to solve this problem. A groove is machined into the small-sized adjusting sleeve 7. The fixture, consisting of a rotatable puller head 2 and an extension rod 1, is inserted into the inner hole of the adjusting sleeve. The puller head 2 is rotated until it aligns with the groove, and a slight pull back causes the puller part 22 to engage with the groove. Continuing to rotate the puller head 2, its end is constrained, forming a rigid connection with the groove of the adjusting sleeve under geometric self-locking. In conventional mode, the extension rod 1 can be pulled directly, applying an axial force of ≤200N to complete disassembly. In impact mode, the sliding slider 5 can also impact the end 4, generating an instantaneous impact force to break the bonded interface.

[0055] This specification describes examples of embodiments of the present invention, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings are not necessarily drawn to scale; some features may be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to implement the present invention in various forms. Those skilled in the art will understand that multiple features illustrated and described with reference to any of the drawings can be combined with features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The illustrated combinations of features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used as needed for specific applications or implementations.

[0056] 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 disassembly tooling for the lower adjusting sleeve of a small-sized drill collar, characterized in that, include: An extension rod, which is a slender rod, has a first end connected to an adapter. The first end face of the adapter is provided with an assembly groove along the central axis. The length of the assembly groove is greater than or equal to the diameter of the adapter. The assembly groove divides the adapter into two symmetrical rotating seats. The rotating seats are provided with a first rotating pin assembly hole. A pulling head, comprising a connecting part and pulling parts disposed on both sides of the connecting part, wherein the connecting part is provided with a second rotating pin mounting hole, and the rotating pin is sequentially mounted in the first rotating pin mounting hole, the second rotating pin mounting hole and the first rotating pin mounting hole, so that the entire pulling head can rotate within a certain range based on the adapter.

2. The small size drill collar down-adjusting sleeve dismounting tool according to claim 1, characterized in that, The assembly slot includes two vertical sides, a first horizontal bottom surface, an inclined bottom surface, and a second horizontal bottom surface. The two vertical sides are respectively located on two rotating seats. The first horizontal bottom surface and the second horizontal bottom surface are respectively located on two open sides of the assembly slot. The distance from the first horizontal bottom surface to the end face is less than the distance from the second horizontal bottom surface to the end face. The first horizontal bottom surface and the second horizontal bottom surface are connected by the inclined bottom surface.

3. The disassembly fixture for the lower adjusting sleeve of the small-sized drill collar according to claim 1, characterized in that, The connecting part and the drawing part are integrally formed block structures. The thickness of the connecting part is greater than the thickness of the drawing part. The connecting part and the drawing part have an arc transition. The top and bottom of the drawing head are flat.

4. The small-size drill collar down-adjusting sleeve dismounting tool according to claim 3, characterized in that, The end of the drawing part is arc-shaped.

5. The small size drill collar down-adjusting sleeve dismounting tool according to claim 1, characterized in that, The second end face of the adapter is provided with a snap-fit ​​groove, and the first end of the extension rod is provided with a snap-fit ​​part that matches the shape of the snap-fit ​​groove.

6. The small-size drill collar down-adjusting sleeve dismounting tool according to claim 1, characterized in that, The second end of the extension rod is provided with a head, which is detachably connected to the extension rod.

7. The small-size drill collar down-adjusting sleeve dismounting tool according to claim 6, characterized in that, The end is threadedly connected to the extension rod.

8. The disassembly fixture for the lower adjusting sleeve of the small-sized drill collar according to claim 7, characterized in that, The lower adjustment sleeve disassembly fixture also includes a slider, which is sleeved on the extension rod and can slide on the extension rod.

9. The small-size drill collar down-adjusting sleeve dismounting tool according to any one of claims 1-8, characterized in that, An ultrasonic transducer is embedded inside the adapter, and the ultrasonic transducer is communicatively connected to a handheld control terminal.

10. The small-size drill collar down-adjusting sleeve dismounting tool according to any one of claims 1-8, characterized in that, The extension rod is a segmented threaded connection extension rod.

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