A type of in-well pipe cutter

Abstract

An in-well pipe cutter includes: an operating rod, a ring-shaped cutter, and a limiting bracket; the ring-shaped cutter is rotatably connected to the lower end of the operating rod; the inner ring of the ring-shaped cutter is sharpened; one end of the limiting bracket is fixed to the lower part of the operating rod, and the other end is located on the rotation trajectory on both sides above the ring-shaped cutter. This in-well pipe cutter has a simple structure, is convenient and safe to operate, provides precise cutting, is adaptable to various well conditions, does not damage the well wall, and is environmentally friendly and efficient.

Description

Technical Field

[0001] This utility model relates to a pipe cutter, specifically to an in-well pipe cutter. Background Technology

[0002] In mines, geothermal wells, or pumping wells, water pumps or well-washing ducts are often suspended hundreds of meters deep by PVC hoses for pumping or well-washing. Over time, due to scale buildup on the well walls, rock displacement, or silt accumulation, the pumps or ducts can become stuck and immobile, making it nearly impossible for workers to remove the obstruction from outside the well. Forcibly pulling them out would damage the pump, but more importantly, render the expensive well unusable. Therefore, the most economical solution is to cut the PVC hose connecting the pump or well-washing duct in half near the jamming point. The upper half of the PVC hose is removed to make room for a new pump or duct and the existing hose, allowing for continued production. The lower half of the hose, along with the stuck pump or duct, is discarded at the bottom of the well.

[0003] Currently, the cutting of PVC pipes inside wells is mostly done manually by going down into the well or by chemical corrosion, but this has the following problems:

[0004] (1) Manual operation is risky, especially in deep wells or confined spaces;

[0005] (2) Chemical cutting methods are prone to polluting groundwater layers and have poor environmental performance;

[0006] (3) The cutting accuracy is low and it is easy to damage the well wall, which affects subsequent operations.

[0007] Therefore, there is an urgent need to find an in-well pipe cutter that is simple in structure, easy to operate, safe, precise in cutting, adaptable to various well conditions, does not damage the well wall, and is environmentally friendly and efficient. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the existing technology and provide an in-well pipe cutter that is simple in structure, convenient and safe to operate, precise in cutting, adaptable to various well conditions, does not damage the well wall, and is environmentally friendly and efficient.

[0009] The technical solution adopted by this utility model to solve its technical problem is as follows: A well pipe cutter includes: an operating rod, a ring cutter, and a limiting bracket; the ring cutter is rotatably connected to the lower end of the operating rod; the inner ring of the ring cutter is sharpened; one end of the limiting bracket is fixed to the lower part of the operating rod, and the other end is located on the rotation trajectory on both sides above the ring cutter. In order to complete the "downhole amputation" of PVC hoses or cables connected to water pumps or well cleaning ducts, this utility model well pipe cutter can be lowered to a designated depth along the narrow casing channel and remotely cut in a water-filled environment; it is like a remote-controlled scalpel, allowing ground staff to "cut" out the damaged pipe string without shoveling soil, thus saving the old well and avoiding the huge cost of re-drilling.

[0010] The working process of this utility model well pipe cutter is as follows:

[0011] When it is necessary to cut the PVC hose or cable connected to the abandoned water pump or well cleaning duct in a deep well, outside the well, first fold the ring cutter towards the limiting bracket, then insert the tail end of the PVC hose or cable through the underside of the ring cutter. The operator holds the operating rod to guide the ring cutter along the PVC hose or cable towards the jamming point. During the process, the ring cutter will bend towards the far end of the operating rod due to the friction of the PVC hose or cable surface. At this time, the limiting bracket can limit its bending angle. When the ring cutter reaches the jamming point, the operator gently lifts the operating rod outside the well. At this time, the ring cutter flips downward. The lower side of the far end of the inner ring of the ring cutter and the upper side of the near end of the inner ring are tilted and jammed by the friction of the PVC hose or cable surface. The operator then lifts the operating rod forcefully outside the well, and the PVC hose or cable is cut by the ring cutter.

[0012] Preferably, the operating rod is a Φ42mm drill rod.

[0013] Preferably, the annular cutter is rotatably connected to the lower end of the operating rod via a movable connecting ring.

[0014] Preferably, the ring cutter is an elliptical ring cutter. When using an elliptical ring cutter, the minor axis of the elliptical ring cutter only needs to be slightly larger than the diameter of the PVC hose or cable. The major axis of the inner ring of the elliptical ring cutter not only provides a larger projected area for the PVC hose or cable to pass through, thus reducing resistance, but also the relatively narrow distal end of the major axis of the inner ring of the elliptical ring cutter can better fix the PVC hose or cable, making it easier to cut without slipping and allowing for better force application.

[0015] Preferably, the long axis end of the elliptical ring cutter is rotatably connected to the lower end of the operating rod.

[0016] Preferably, the cross-section of the inner ring blade is a V-shaped cutting edge. The V-shaped cutting edge can precisely control the cutting depth.

[0017] Preferably, the ring-shaped cutting tool is made of high-speed steel.

[0018] Preferably, the other end of the limiting bracket restricts the folding angle between the annular cutter and the distal end of the operating rod on one side of the limiting bracket to ≥90°. The functions of the limiting bracket are: firstly, to maximize the projected area of ​​the inner ring of the annular cutter perpendicular to the PVC hose or cable, thereby reducing the resistance to passage and ensuring the stable passage of the annular cutter in the well; secondly, to guide and restrict the movement direction of the PVC hose or cable, preventing it from twisting relative to the operating rod.

[0019] The beneficial effects of this in-well pipe cutter are as follows:

[0020] (1) The well pipe cutter of this utility model has a simple structure, is easy to mass-produce and maintain, reduces operating costs, is convenient and safe to operate, and cuts accurately;

[0021] (2) This utility model of the pipe cutter is suitable for various well depths and well inclination conditions. It can be widely used in the maintenance and repair of groundwater wells, geothermal wells, and ground immersion production wells. It is adaptable to various well conditions, does not damage the well wall, does not cause thermal damage to PVC pipes, does not require chemical agents, avoids groundwater pollution, and is environmentally friendly and efficient. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the in-well pipe cutter of this utility model;

[0023] Figure 2 This is a side view of Embodiment 1 of the in-well pipe cutter of this utility model;

[0024] Figure 3 This is a top view of Embodiment 1 of the in-well pipe cutter of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the in-well pipe cutter of this utility model in use, according to Embodiment 1. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0027] Example 1

[0028] A well pipe cutter includes: an operating rod 1, an elliptical ring cutter 2, and a limiting bracket 3; the long axis end of the elliptical ring cutter 2 is rotatably connected to the lower end of the operating rod 1 through a movable connecting ring 4; the inner ring 2-1 of the elliptical ring cutter 2 is sharpened; one end of the limiting bracket 3 is fixed to the lower part of the operating rod 1, and the other end is located on the rotation trajectory on both sides above the elliptical ring cutter 2.

[0029] The operating rod 1 is a Φ42mm drill rod; the inner ring 2-1 has a V-shaped cutting edge; the elliptical ring cutter 2 is made of high-speed steel; and the other end of the limiting bracket 3 restricts the elliptical ring cutter 2 to fold at a 90° angle with the far end of the operating rod 1 on one side of the limiting bracket 3.

[0030] The working process of this utility model well pipe cutter is as follows:

[0031] When it is necessary to cut the PVC hose or cable connected to the abandoned water pump or well cleaning duct in a deep well, outside the well, first fold the elliptical ring cutter 2 towards the limiting bracket 3, then insert the tail end of the PVC hose or cable through the lower side of the elliptical ring cutter 2. The operator holds the operating rod 1 to guide the elliptical ring cutter 2 along the PVC hose or cable towards the jamming point. During the process, the elliptical ring cutter 2 will be folded towards the far end of the operating rod 1 due to the friction of the PVC hose or cable surface. At this time, the limiting bracket 3 can limit its folding angle. When the elliptical ring cutter 2 reaches the jamming point, the operator gently lifts the operating rod 1 outside the well. At this time, the elliptical ring cutter 2 flips downward. The lower side of the far end of the inner ring 2-1 of the elliptical ring cutter 2 and the upper side of the near end of the inner ring 2-1 tilt and jam the PVC hose or cable under the action of the friction of the PVC hose or cable surface. The operator then lifts the operating rod 1 forcefully outside the well, and the PVC hose or cable is cut by the elliptical ring cutter 2.

Claims

1. A pipe cutting device for use in a well, characterized in that include: An operating lever, a ring-shaped cutter, and a limiting bracket; the ring-shaped cutter is rotatably connected to the lower end of the operating lever; the inner ring of the ring-shaped cutter is sharpened; one end of the limiting bracket is fixed to the lower part of the operating lever, and the other end is located on the rotation trajectory on both sides above the ring-shaped cutter.

2. The in-line pipe cutter of claim 1, wherein: The ring cutter is rotatably connected to the lower end of the operating rod via a movable connecting ring; the ring cutter is an elliptical ring cutter; the major axis end of the elliptical ring cutter is rotatably connected to the lower end of the operating rod; the inner ring cutting edge has a V-shaped cutting edge; the ring cutter is made of high-speed steel.

3. A wireline pipe cutter according to claim 1 or 2, characterised in that: The other end of the limiting bracket restricts the folding angle between the ring cutter and the far end of the operating rod on one side of the limiting bracket to ≥90°.

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