Self-rotating hot metal underground pipe column cutting cylinder

Abstract

The invention discloses a self-rotating hot metal downhole string cutting cylinder, which belongs to the technical field of oil and gas field drilling tools, and comprises an outer cylinder, one end of the outer cylinder is in threaded connection with an upper joint, a heating control mechanism is arranged between the upper joint and the outer cylinder, a graphite inner cylinder is arranged in the outer cylinder, and one end of the outer cylinder far away from the upper joint is provided with a guide shoe; and a plurality of through holes are formed between the outer cylinder and the graphite inner cylinder. The cutting device is used for cutting a sleeve in the overhaul process and also can be used for cutting a drilling pipe column when a drilling tool is stuck in the drilling process, meanwhile, the cutting device is provided with the jet holes, namely the through holes, with a certain angle, and meanwhile, the cutting device is provided with the guiding shoe, so that the sleeve and the pipe column cannot be damaged in the tripping-in and initial process. The invention belongs to a matched tool for processing complicated conditions of overhaul and well drilling.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field drilling tools, and in particular relates to a self-rotating hot metal downhole pipe column cutting barrel. Background Art

[0002] The present invention is a tool for cutting casing during overhaul and drilling when a drill bit is stuck. The self-rotating hot metal downhole pipe string cutting barrel involved in the present invention utilizes the characteristics of high temperature and high pressure generated during the redox reaction of active metals and metal oxides to spray high temperature and high pressure liquid metal and metal oxides onto the inner wall of the deformed or damaged casing, and utilizes high temperature to melt the metal, thereby achieving the purpose of cutting the pipe string. In previous scientific research and experiments, it was found that the fixed hot metal downhole pipe string cutting tool has a cutting range only within the range near the circumference of the injection hole. If you want to successfully complete the cutting, you need to add a large amount of chemicals and greatly increase the loading capacity of the tool. A large loading capacity often means a large diameter. The increase in the diameter of the tool increases the risk of complex situations such as drill bit sticking during the lowering and extraction of the tool. Summary of the invention

[0003] The purpose of the present invention is to provide a self-rotating hot metal downhole pipe cutting barrel to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a self-rotating hot metal downhole tubular cutting barrel, comprising an outer barrel, one end of the outer barrel is threadedly connected to an upper joint, a heating control mechanism is provided between the upper joint and the outer barrel, a graphite inner barrel is provided inside the outer barrel, a guide shoe is provided at the end of the outer barrel away from the upper joint, and a plurality of through holes are provided between the outer barrel and the graphite inner barrel.

[0005] Preferably, a connecting block is threadedly connected to one side of the upper joint close to the outer cylinder, and the connecting block is slidingly connected to the graphite inner cylinder and the outer cylinder respectively.

[0006] Preferably, the connecting block is internally threaded with a threadable bolt.

[0007] Preferably, the direction of the through hole is opposite to the thread direction of the connecting block.

[0008] Preferably, the graphite inner cylinder and the outer cylinder are connected by a key.

[0009] Preferably, a filling block is threadedly connected to one end of the outer tube close to the guide shoe.

[0010] The present invention discloses the following technical effects: the present invention is used for casing cutting during overhaul, and can also be used for cutting the drilling pipe string when the drill is stuck during drilling, and is provided with a jet hole, i.e., a through hole, at a certain angle, and a guide shoe is installed at the bottom of the present invention, so that the casing and the pipe string will not be damaged during the lowering and initial processes.

[0011] The present invention adopts an oblique drilling design. When working, the reaction force generated by the high-temperature and high-pressure liquid metal and metal oxide spraying drives the rotatable spraying mechanism of the present invention to rotate, and then sprays the high-temperature and high-pressure liquid metal and metal oxide onto the inner surface of the cut pipe column to cut the target pipe column. The present invention has the characteristics of simple operation, small size, easy to carry and on-site installation, and can effectively reduce the risk of secondary accidents during the operation process. It is an oil and gas well operation tool with high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0013] Figure 1 It is a structural schematic diagram of the self-rotating hot metal downhole pipe string cutting barrel of the present invention;

[0014] Figure 2 It is a structural schematic diagram of the rotatable injection mechanism of the present invention;

[0015] Figure 3 It is a structural schematic diagram of the rotary injection hole mechanism of the present invention.

[0016] In the figure: 1. upper joint; 2. heating control mechanism; 3. threadable bolt; 4. connecting block; 5. graphite inner cylinder; 6. outer cylinder; 7. filling block; 8. guide shoe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figure 1-Figure 3As shown, this embodiment provides a self-rotating hot metal downhole tubular cutting tube, including an outer tube 6, one end of the outer tube 6 is threadedly connected to an upper joint 1, a heating control mechanism 2 is provided between the upper joint 1 and the outer tube 6, a graphite inner tube 5 is provided in the outer tube 6, a guide shoe 8 is provided at the end of the outer tube 6 away from the upper joint 1, and a plurality of through holes are provided between the outer tube 6 and the graphite inner tube 5.

[0020] The invention is used for cutting casing during overhaul, and can also be used for cutting the drilling pipe column when the drill is stuck during drilling. At the same time, a jet hole or a through hole at a certain angle is provided, and a guide shoe 8 is provided, so that the casing and the pipe column will not be damaged during the lowering and initial process. The invention belongs to a matching tool for overhaul and complex drilling situation processing.

[0021] The present invention is a tool for cutting casing during overhaul and cutting drilling pipes when the drill bit is stuck during drilling. The present invention involves a self-rotating hot metal downhole pipe inner cutting barrel, which utilizes the characteristics of high temperature and high pressure generated during the oxidation-reduction reaction of active metals and metal oxides to spray high-temperature and high-pressure liquid metal and metal oxides onto the inner wall of the deformed or damaged casing, and utilizes the high temperature to melt the metal, thereby achieving the purpose of cutting the pipe.

[0022] The present invention adopts an oblique drilling design. When working, the reaction force generated by the high-temperature and high-pressure liquid metal and metal oxide spraying drives the rotatable spraying mechanism of the present invention to rotate, and then sprays the high-temperature and high-pressure liquid metal and metal oxide onto the inner surface of the cut pipe column to cut the target pipe column. The present invention is simple to operate, small in size, easy to carry and install on site, and can effectively reduce the risk of secondary accidents during the operation process. It is an oil and gas well operation tool with high promotion value.

[0023] The invention has a simple structure and a small volume. It only needs to use the drill rod to go down to the designated position without other operations. The jet energy is large and uniform, and the resistance to going down is small. It solves the problems of low success rate of mechanical cutting when working in oily casing, high requirements for operation accuracy, high requirements for tool strength, and secondary accidents such as drill sticking during operation.

[0024] The reaction force generated by the injection of high-temperature and high-pressure liquid metal and metal oxide drives the rotatable injection mechanism of the present invention to rotate, thereby injecting the high-temperature and high-pressure liquid metal and metal oxide onto the inner surface of the cut pipe column to cut the target pipe column.

[0025] The present invention is provided with a sealing isolation mechanism and a temperature isolation component (not shown in the figure) to ensure the reuse of most tool parts, thereby greatly reducing the use cost of the tool.

[0026] According to a further optimized solution, a connecting block 4 is threadedly connected to one side of the upper joint 1 close to the outer cylinder 6, and the connecting block 4 is slidingly connected to the graphite inner cylinder 5 and the outer cylinder 6 respectively.

[0027] According to a further optimized solution, the connecting block 4 is internally threaded with a threadable bolt 3 .

[0028] Further optimizing the scheme, the direction of the through hole is opposite to the thread direction of the connecting block 4. When spraying, the loosening and falling off of the thread of the connecting block 4 will not cause fish to fall or affect the construction effect.

[0029] According to a further optimized solution, the graphite inner cylinder 5 and the outer cylinder 6 are connected by a key.

[0030] According to a further optimized solution, a filling block 7 is threadedly connected to one end of the outer tube 6 near the guide shoe 8 .

[0031] The function of the heating control mechanism 2 is to receive instructions and supply power to the reaction heating device. The middle opening of the threaded bolt 3 can only allow the power supply wire to pass through, so as to avoid damage to the heating control mechanism 2 due to the overflow of high-temperature and high-pressure gas during operation. The connecting block 4 makes the upper joint 1 contact and cooperate with the gap surface of the graphite inner tube 5 and the outer tube 6 through the thread and the gap hole surface. The graphite inner tube 5 and the outer tube 6 can constitute a rotating injection mechanism. The graphite inner tube 5 and the outer tube 6 are provided with holes in the opposite direction of the thread of the connecting block 4. The force generated when the redox reaction occurs drives the rotating injection mechanism to rotate, and the high-temperature and high-pressure liquid metal and metal oxide are injected onto the inner surface of the cut pipe string, thereby cutting off the target pipe string.

[0032] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A self-rotating hot metal downhole pipe cutting barrel, characterized in that: The invention comprises an outer cylinder (6), one end of which is threadedly connected to an upper joint (1), a heating control mechanism (2) is provided between the upper joint (1) and the outer cylinder (6), a graphite inner cylinder (5) is provided inside the outer cylinder (6), a guide shoe (8) is provided at one end of the outer cylinder (6) away from the upper joint (1), and a plurality of through holes are provided between the outer cylinder (6) and the graphite inner cylinder (5).

2. The self-rotating hot metal downhole pipe cutting barrel according to claim 1, characterized in that: A connection block (4) is threadedly connected to one side of the upper joint (1) close to the outer cylinder (6), and the connection block (4) is slidably connected to the graphite inner cylinder (5) and the outer cylinder (6) respectively.

3. The self-rotating hot metal downhole pipe cutting barrel according to claim 2, characterized in that: The connection block (4) is internally threadedly connected with a threadable bolt (3).

4. The self-rotating hot metal downhole pipe cutting barrel according to claim 2, characterized in that: The direction of the through hole is opposite to the thread direction of the connecting block (4).

5. The self-rotating hot metal downhole pipe cutting barrel according to claim 1, characterized in that: The graphite inner cylinder (5) and the outer cylinder (6) are connected via a key.

6. The self-rotating hot metal downhole pipe cutting barrel according to claim 1, characterized in that: A filling block (7) is threadedly connected to one end of the outer cylinder (6) close to the guide shoe (8).

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