Multi-stage variable-diameter fish fishing tool
By designing a multi-stage variable diameter fish salvage tool and using staggered sliders and beveled planes to slide and clamp the inner wall of the fish, the problems of cumbersome operation and high failure rate of salvage tools when dropping fish with multi-stage inner diameters are solved, and the salvage efficiency and success rate are improved.
Patent Information
- Application Number
- CN202423136782.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-12-18
AI Technical Summary
Existing salvage tools are cumbersome to operate, have a high failure rate, and are inefficient when salvaging fish with multiple levels of different inner diameters. Especially when the inner diameter of the upper fish is large and the inner diameter of the lower fish is small, conventional methods make it difficult for the tools to effectively catch the fish.
A multi-stage variable-diameter fish salvage tool is designed, including an upper joint and a spear rod. The spear rod consists of a first section, a second section, and a tapered guide cone. The two sections of sliders are staggered. The sliders can slide along the oblique plane and clamp onto the inner wall of the fish. The water hole of the spear rod is connected to the water hole of the joint, providing a well-killing fluid circulation channel to adapt to fish with different inner diameters.
The invention simplifies the salvage operation without replacing or reorganizing the tools, thereby improving the success rate and efficiency of salvage. It is particularly suitable for the stable clamping of multi-level inner diameter fish, ensuring that the fishing spear enters the fish cavity smoothly.
Smart Images
Figure CN223387281U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of oil and gas well fishing equipment, in particular to a multi-stage variable-diameter fish fishing tool. Background Art
[0002] During salvage operations in oil, gas, and water wells, complex situations of multiple levels of fish with different inner diameters are encountered. Appropriate salvage methods and tools need to be selected for salvage processing. Conventional internal spear tools can only meet the needs of salvaging fish with a small range of inner diameter variations.
[0003] There are currently two conventional methods for dealing with complex fish with multiple levels of variable diameter, such as fish with a large inner diameter at the upper part and a small inner diameter at the lower part. The first is to use conventional internal fishing tools to first fish with a larger inner diameter at the upper part, and then change the fishing tool parameters to fish with a smaller inner diameter at the lower part. This results in cumbersome and inefficient fishing operations, and often the fishing tools cannot firmly grasp the fish due to limited space in the fish cavity and large variability of the fish. The second method is to use a milling tool to mill the fish with different inner diameters at the upper and lower parts to the same inner diameter before fishing. However, this method often leads to unforeseen complications due to different wall thicknesses and fish movement. The resulting problems of cumbersome fishing procedures, limited tool selection, and high fishing failure rate have been difficult to resolve. Summary of the Invention
[0004] The utility model overcomes the problems of the existing salvage tools in that the salvage operation is cumbersome, the failure rate is high and the efficiency is low when salvaging the complex situation of multiple levels of stacked fish with different inner diameters, and provides a multi-level variable diameter fish salvage tool, which can make the salvage operation simpler and improve the success rate of salvage.
[0005] The utility model provides a multi-stage variable-diameter fish salvaging tool, comprising an upper joint and a spear rod, wherein the upper joint can be connected to a drilling tool and has an axially penetrating joint water eye, the spear rod comprises a first section connected to the upper joint, a second section connected to the first section and a tapered guide cone connected to the second section, the diameter of the first section is greater than the diameter of the second section, the first section, the second section and the guide cone are integrated, and the spear rod has a spear rod water eye penetrating the first section, the second section and the guide cone in the axial direction, the spear rod water eye is communicated with the joint water eye, and the first section and the second section are both provided with sliders.
[0006] Preferably, the first section and the second section are each provided with two sliders, the two sliders are completely staggered in the axial direction of the lance, and the positions of the two sliders in the circumferential direction of the lance differ by 180 degrees.
[0007] Preferably, the outer diameter of the first section is 80 mm to 85 mm, and the outer diameter of the second section is 69 mm to 73 mm.
[0008] Preferably, the maximum radial dimension of the position where the slider is set in the first section is 82mm-93mm, and the maximum radial dimension of the position where the slider is set in the second section is 79mm-83mm.
[0009] Preferably, the first section and the second section are both provided with an oblique cutting plane, the oblique cutting plane is provided with a slide rail, the slider can slide along the slide rail, the slider has a plurality of spear teeth for abutting against the inner cavity of the fallen fish, and the first section and the second section also include a locking block fixed to the oblique cutting plane away from one end of the upper joint, which can limit the position of the slider.
[0010] Compared with the prior art, the present invention has the following advantages: the salvage tool of the present invention can salvage fish with large inner diameters and fish with small inner diameters, and is particularly suitable for fish with both large and small inner diameters. Therefore, when salvaging fish with different inner diameters, there is no need to replace or reorganize the salvage tool, nor is it necessary to expand and mill all the fish first. Therefore, the salvage operation steps can be reduced, thereby improving the efficiency of salvaging. In addition, when salvaging a single fish with multiple inner diameters, the second section can first pass through the inner cavity of the fish with the large inner diameter, and the slider of the second section can be matched with the inner wall of the fish with the small inner diameter, and the slider of the first section can be matched with the inner wall of the large inner diameter. This allows the salvage tool to be more firmly clamped to the fish, thereby improving the success rate of salvaging. In addition, the spear rod water hole is communicated with the joint water hole and can be communicated with the drilling tool water hole, providing a channel for the circulation of the well-killing fluid, so that the well-killing fluid can be circulated. At the same time, the well-killing fluid flowing through the water hole can also expel the sediment above the fallen fish before fishing, so that the fishing spear can enter the fish cavity smoothly. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a structural schematic diagram of a multi-stage variable-diameter fish salvaging tool according to an embodiment of the present invention.
[0012] Reference numerals
[0013] 1 upper connector;
[0014] 2 spear shaft; 21 first section; 211 bevel plane; 212 slide rail, 22 second section, 23 spear shaft water hole, 24 guide cone;
[0015] 3 sliders, 31 spear teeth;
[0016] 4 locking blocks. DETAILED DESCRIPTION
[0017] The present invention provides a multi-stage variable-diameter fishing and salvaging tool, comprising an upper joint 1 and a spear shaft 2. The upper joint 1 is connectable to a drill bit. In this embodiment, the upper joint 1 has internal threads, one end of which is threadedly connected to the drill bit and the other end of which is threadedly connected to the spear shaft 2. The upper joint 1 also has a joint water hole (not shown) extending axially therethrough. The spear shaft 2 includes a first section 21 connected to the upper joint 1, a second section 22 connected to the first section 21, and a tapered guide cone 24 connected to the second section 22. The diameter of the first section 21 is greater than that of the second section 22, and the first section 21, second section 22, and guide cone 24 are integral. The spear shaft 2 also has a spear shaft water hole 23 extending axially through the first section 21, second section 22, and guide cone 24. In this embodiment, the diameter of the spear shaft water hole 23 is 10 mm. The spear shaft water hole 23 communicates with the joint water hole. Both the first section 21 and the second section 22 are provided with a slider 3.
[0018] The salvage tool of the present invention comprises a first section 21, a second section 22 and a tapered guide cone 24 with different diameters, and the three are integrated. During salvage, the drilling tool and the salvage tool are lowered, and the second section 22 can be used to salvage fish with a small inner diameter alone, and the first section 21 can be used to salvage fish with a large inner diameter. During salvage, the guide cone 24 and the second section 22 first pass through the large inner diameter of the fish, and the slider 3 of the first section 21 cooperates with the inner wall of the large inner diameter of the fish. The salvage tool of the present invention is particularly suitable for fish with both large and small inner diameters. Therefore, when salvaging fish stacked with different inner diameters, there is no need to replace or reorganize the salvage tool, nor is there any need to expand and mill all the fish first. Therefore, the salvage operation steps can be reduced, thereby improving the salvage efficiency. Furthermore, when retrieving a single fish with multiple inner diameters, the second section 22 can be first passed through the larger inner diameter cavity of the fish, with its slider 3 engaging the inner wall of the smaller inner diameter of the fish. The slider 3 of the first section 21 can then engage the inner wall of the larger inner diameter. This allows the retrieving tool to more securely engage the fish, thereby increasing the success rate of retrieving. Furthermore, the spear shaft water hole 23 communicates with the joint water hole and can be connected to the water hole of the drilling tool, providing a channel for the circulation of the well-killing fluid. This allows the well-killing fluid to circulate and, prior to retrieving, dislodge any sediment above the fish, allowing the spear to enter the fish cavity smoothly.
[0019] like Figure 1As shown, each of the first and second sections 21, 22 is equipped with two sliders 3. These sliders are completely offset axially along the lance shaft 2, and their circumferential positions differ by 180 degrees. This arrangement allows the fishing tool to engage the inner cavity of the fish in opposite directions, thereby clamping the fish. This allows the fish being fished to overcome the downward force exerted by other fish, further improving the success rate of fishing. Furthermore, since each section has two sliders 3, the two sliders 3 can be of the same or different specifications. By changing the specifications of the sliders 3, a wider range of fish can be fished.
[0020] The outer diameter of the first section 21 is 80mm-85mm. In the present embodiment, the outer diameter of the first section 21 is 82mm, and the length is 0.7m. The outer diameter of the second section 22 is 69mm-73mm. In the present embodiment, the outer diameter of the second section 22 is 71mm, and the length is 0.8m. The outer diameter of the upper joint 1 is 105mm, and the length is 0.2m. The maximum radial dimension of the position where the slider 3 is set in the first section 21 is 82mm-93mm, and the maximum radial dimension of the position where the slider 3 is set in the second section 22 is 79mm-83mm. Replacing sliders 3 of different thicknesses can adapt to fish falling in different cavities.
[0021] like Figure 1 As shown, both the first and second sections 21, 22 are provided with a chamfered surface 211. The end of the chamfered surface 211, which is closer to the axis of the lance 2 and closer to the upper connector 1, is slightly further away from the axis of the lance 2. The chamfered surface 211 is provided with a slide rail 212 (not shown). The slider 3 can slide along the slide rail 212 but cannot radially leave the slide rail 212. The slider 3 has a plurality of lance teeth 31 for contacting the inner cavity of the fish trap. The first and second sections 21, 22 also include a locking block 4 fixed to the chamfered surface 211 at the end away from the upper connector 1 to define the position of the lance teeth 31. The locking block 4 is detachably connected to the lance 2 via threads or other structures. When replacing the slider 3, the locking block 4 is first removed, the slider 3 is removed, a new slider 3 is installed, and then the locking block 4 is installed.
[0022] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art within the spirit and scope of protection of the present invention also fall within the scope of protection of the present invention.
Claims
1. A multi-stage variable diameter fish salvage tool, characterized in that: It includes an upper joint and a spear rod, the upper joint can be connected to the drilling tool and has an axially penetrating joint water hole, the spear rod includes a first section connected to the upper joint, a second section connected to the first section and a conical guide cone connected to the second section, the diameter of the first section is greater than the diameter of the second section, the first section, the second section and the guide cone are integrated, and the spear rod has a spear rod water hole that passes through the first section, the second section and the guide cone in the axial direction, the spear rod water hole is communicated with the joint water hole, and the first section and the second section are both provided with sliders.
2. The fishing tool according to claim 1, characterized in that: The first section and the second section are both provided with two sliders, the two sliders are completely staggered in the axial direction of the lance, and the positions of the two sliders in the circumferential direction of the lance differ by 180 degrees.
3. The fishing tool according to claim 1, characterized in that: The outer diameter of the first section is 80mm-85mm, and the outer diameter of the second section is 69mm-73mm.
4. The fishing tool according to claim 3, characterized in that: The maximum radial dimension of the position where the slider is set in the first section is 82 mm to 93 mm, and the maximum radial dimension of the position where the slider is set in the second section is 79 mm to 83 mm.
5. The fishing tool according to claim 1, characterized in that: The first section and the second section are both provided with an oblique cutting plane, and the oblique cutting plane is provided with a slide rail, and the slider can slide along the slide rail, and the slider has a plurality of spear teeth for resisting against the inner cavity of the falling fish. The first section and the second section also include a locking block fixed to the oblique cutting plane away from one end of the upper joint, which can limit the position of the slider.