Built-in bayonet type sleeve fishing device

Abstract

The utility model relates to a built-in bayonet type casing pipe salvage device, which adopts a built-in bayonet type salvage rod to salvage a casing pipe, and comprises a salvage rod body and a clamping lug device, the salvage device can sink to the position of a casing pipe joint by utilizing the self weight of the salvage rod body, a gap at the position of the casing pipe joint is clamped by utilizing a telescopic alternating carbon steel clamping lug, and the larger the upward pulling force is, the larger the salvage rod body is. Therefore, the purpose of quickly fishing the casing pipe is achieved. The built-in bayonet type casing pipe salvage device is simple in structure, convenient to manufacture and high in efficiency, manpower and salvage cost can be greatly saved, working efficiency of geotechnical engineering investigation is improved, and the built-in bayonet type casing pipe salvage device plays a positive role in development of the geotechnical engineering investigation industry.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering exploration and drilling technology, specifically to a built-in bayonet-type casing retrieval device. Background Technology

[0002] In geotechnical engineering investigation, casings serve to prevent borehole wall collapse and isolate water leakage layers. They are widely used in the investigation of fill and gravel soil layers. After the drilling field operation is completed, the casings should be recycled and reused. However, as the number of times the casings are used increases, the threads at the casing joints wear, which often leads to safety accidents where the casings fall into the borehole.

[0003] The commonly used method is to use a casing to reconnect the casing that has fallen into the borehole, or to use a steel casing and a rotary drilling rig to drill out the fallen casing. However, the current methods are not only time-consuming and labor-intensive, but also inefficient.

[0004] How to retrieve fallen casing conveniently, quickly, and cost-effectively has become an urgent problem to be solved in geotechnical engineering investigation. Researching an efficient casing retrieval device will have a positive promoting effect on the development of the geotechnical engineering investigation industry. Utility Model Content

[0005] To address the technical problems existing in the prior art, this utility model provides a built-in bayonet-type sleeve retrieval device.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A built-in bayonet-type sleeve retrieval device includes: a retrieval device and a clamping device;

[0008] The salvage device includes a conical opening, a salvage rod, and a male connector connected in sequence. The salvage rod has a slot, and the slot has a first hinge point.

[0009] The locking device includes a carbon steel locking lug, a spring, a second hinge point, and two spring buckles, all located on the side of the retrieval rod. The carbon steel locking lug is V-shaped, and the second hinge point is located at the V-shaped end of the carbon steel locking lug. The two ends of the spring are connected to the two ends of the carbon steel locking lug by a spring buckle.

[0010] The locking device is installed in the slot in the retrieval rod through overlapping hinge points.

[0011] The retrieval device is connected to the drill pipe to provide upward pulling force.

[0012] The salvage device is lowered to the sleeve joint position and uses retractable carbon steel clamps to lock the gap at the sleeve joint in order to salvage the sleeve.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model discloses a built-in bayonet-type casing retrieval device for quickly and conveniently retrieving casings that have fallen into boreholes. The device utilizes a built-in bayonet-type retrieval rod, mainly comprising a retrieval rod body and a clamping lug device. Using the weight of the retrieval rod body, the device can sink to the casing joint position. The retractable carbon steel clamping lugs then clamp the gap at the casing joint; the greater the upward pulling force, the tighter the clamping lugs, thus achieving the purpose of quickly retrieving the casing. This device is not only simple in structure, easy to manufacture, and highly efficient, but it also greatly saves manpower and retrieval costs, improves the efficiency of geotechnical engineering investigation, and plays a positive role in the development of the geotechnical engineering investigation industry. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a plan view of the present invention;

[0017] Figure 3 This is a side view of the present invention;

[0018] Figure 4 This is a plan view of the cassette device;

[0019] Figure 5 This is a schematic diagram of the structure of the present invention during operation;

[0020] Figure 6 This is a plan view of the present invention in operation.

[0021] Among them, 1. tapered opening; 2. carbon steel clasp; 3. spring; 4. retrieval rod body; 5. male connector; 6. hinge point; 7. spring buckle; 8. clasp groove; 9. drill pipe; 10. drill pipe joint; 11. casing; 12. casing female connector. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to specific embodiments:

[0023] like Figure 1-6 As shown in this embodiment, a built-in bayonet-type sleeve retrieval device includes: a retrieval device and a clamping device;

[0024] The salvage device includes a conical opening 1, a salvage rod 4, and a male connector 5 connected in sequence, and the salvage rod 4 is provided with a slot 8;

[0025] The locking device includes a carbon steel locking lug 2, a spring 3, and two spring buckles 7, which are set on the side of the retrieval rod. The carbon steel locking lug 2 is V-shaped, and hinge points 6 are provided in the locking groove 8 and at the V-shaped end of the carbon steel locking lug 2. The two ends of the spring 3 are respectively connected to the two sections of the carbon steel locking lug 2 through a spring buckle 7.

[0026] The locking device is installed in the locking groove 8 in the retrieval rod body 4 through the hinge point 6.

[0027] The retrieval device in this invention provides upward pulling force by connecting to the drill rod 9.

[0028] The retrieval device of this utility model sinks by the weight of the retrieval rod 4. During the sinking process, the inner wall of the casing 9 squeezes the carbon steel clasp 2, and the carbon steel clasp 2 contracts to squeeze the spring 3, so that the retrieval rod 4 sinks smoothly inside the casing 9. When it sinks to the joint of the two casing sections, the retrieval rod 4 is lifted up, and the retractable carbon steel clasp 2 is used to lock the gap at the casing joint. The drill rod 9 provides the upward pulling force. The greater the upward pulling force, the tighter the carbon steel clasp 2 is locked, and the casing 11 that has fallen into the borehole can be retrieved quickly.

[0029] This utility model has a simple structure, is easy to manufacture, and is highly efficient, which greatly saves manpower and salvage costs, improves the work efficiency of geotechnical engineering investigation, and plays a positive role in the development of the geotechnical engineering investigation industry.

[0030] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-creative modifications to this embodiment as needed after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A built-in bayonet-type sleeve retrieval device, characterized in that, include: Salvage equipment and clamping devices; The salvage device includes a conical opening, a salvage rod, and a male connector connected in sequence, and the salvage rod is provided with a slot. The clamping device includes a carbon steel clamp, a spring, and two spring buckles disposed on the side of the retrieval rod. The carbon steel clamp is V-shaped, and hinge points are provided in the clamping groove and at the V-shaped end of the carbon steel clamp. The two ends of the spring are respectively connected to the two ends of the carbon steel clamp through a spring buckle.

2. The built-in bayonet-type sleeve retrieval device according to claim 1, characterized in that, The locking device is installed in a slot in the retrieval rod through overlapping hinge points.

3. The built-in bayonet-type sleeve retrieval device according to claim 1, characterized in that, The retrieval device is connected to the drill pipe to provide upward pulling force.

4. The built-in bayonet-type sleeve retrieval device according to claim 1, characterized in that, The salvage device is lowered to the sleeve joint position and uses retractable carbon steel clamps to lock the gap at the sleeve joint in order to salvage the sleeve.

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