A tool delivery device inside a metal pipe column

Abstract

The present invention discloses a tool dropping device inside a metal pipe string. The dropping device includes a magnet and a fixed connection device; the magnet is installed on the fixed connection device to prevent the magnet from colliding with the inner wall of the metal pipe; the lower part of the fixed connection device is connected to a tool that needs to be dropped downward inside the metal pipe; the magnet, the fixed connection device and the tool are installed into a tool string, which is placed in the inner hole of the metal pipe for release, and the tool string falls inside the metal pipe to achieve the tool dropping function; when the magnet moves downward relative to the metal pipe, the tool string is subject to gravity, magnetic attraction force, frictional force and electromagnetic damping force, and the falling speed of the tool string is limited within an allowable range. The advantages of the present invention are that the dropping device has a simple structure, the dropping speed is controllable, it can provide protection for the lowering of tools and instruments, and improve the success rate of tool and instrument dropping.

Description

Technical Field

[0001] The present invention relates to a tool delivery device for oil drilling and production, and particularly to a tool delivery device inside a metal pipe string. Background Art

[0002] During the process of oil drilling and production, operations of putting tools and instruments into drill pipes or tubing pipe strings are often encountered. Especially when the pipe string contains gas and there is no liquid damping, during the descent of the tool inside the pipe string, it accelerates continuously. The tool often collides and gets damaged due to its too fast falling speed, resulting in economic losses and affecting the progress of drilling and production operations. Therefore, it is very necessary to design a delivery device inside a metal pipe string to limit the speed of the entire falling tool string, thereby reducing the collision between the tool and the device inside the pipe string, and protecting the safety and success rate of tool delivery. Summary of the Invention

[0003] The purpose of the present invention is to provide a tool delivery device inside a metal pipe string to avoid tool damage caused by too fast falling speed when delivering tools inside the metal pipe string, aiming at the problems existing in the prior art.

[0004] To achieve the above purpose, the present invention adopts the following design:

[0005] A tool delivery device inside a metal pipe string includes a magnet and a fixed connection device; the magnet is a magnetic field generating device, and magnetic yokes are installed above and below the magnet to guide magnetic field lines; the magnet is installed on the fixed connection device, and a connecting piece is provided at the lower part of the fixed connection device.

[0006] The above solution further includes:

[0007] The magnet is a cylindrical magnet or a circular ring magnet.

[0008] The magnet is a neodymium iron boron magnet.

[0009] The material of the fixed connection device is non-ferromagnetic material.

[0010] The connecting piece of the fixed connection device is in a hinged connection mode; a centralizer is provided around the fixed connection device.

[0011] The advantage of the present invention is that the delivery device has a simple structure, controllable delivery speed, can provide protection for the lowering of tools and instruments, and improve the success rate of tool and instrument delivery. Brief Description of the Drawings

[0012] Figure 1 It is a schematic diagram when a tool delivery device inside a metal pipe string of the present invention is lowered inside the metal pipe string.

[0013] Figure 2 It is a schematic structural diagram of Embodiment 1 of a tool delivery device inside a metal pipe string of the present invention.

[0014] Figure 3 This is a schematic structural diagram of the second embodiment of a tool delivery device inside a metal pipe column according to the present invention.

[0015] Figure 4 This is a schematic structural diagram of the third embodiment of a tool delivery device inside a metal pipe column according to the present invention.

[0016] In the figure: 1. Metal pipe column, 2. Magnet, 3. Fixed connection device, 4. Tool, 30. Upper gland A, 31. Outer cylinder, 32. Hinge mechanism, 33. Upper gland B, 34. Core shaft, 35. Anti-collision sleeve, 36. Magnetic yoke. Detailed implementation manners

[0017] The following further describes the present invention in conjunction with the appended Figure 1 to the appended Figure 4 :

[0018] Embodiment 1: As shown in Figure 1 and Figure 2 , a tool delivery device inside a metal pipe column includes a magnet 2 and a fixed connection device 3; the magnet 2 is a magnetic field generating device. The magnet 2 is installed on the fixed connection device 3 to prevent the magnet 2 from colliding with the inner wall of the metal pipe column 1; the lower part of the fixed connection device 3 is connected to a tool 4 that needs to be delivered downward inside the metal pipe column 1. The magnet 2, the fixed connection device 3, and the tool 4 are installed as a tool string and released in the inner hole of the metal pipe column 1, and the tool string falls inside the metal pipe column 1 to achieve the tool delivery function.

[0019] When the magnet 2 moves downward relative to the metal pipe column, an induced current is generated on the wall of the metal pipe column 1, and the induced current prevents the magnet 2 from falling. The upward damping force of the induced current on the magnet 2 is Fc, and the damping force Fc is proportional to the falling speed V of the tool string; the axial component of the suction force formed between the magnet 2 and the metal pipe column 1 is Fa, and an upward frictional force Fb is generated when the tool string contacts the inner wall of the pipe column 1. The gravity of the tool string is Gm. When the falling speed of the tool string is zero, the force relationship of the tool string is: Gm > Fa + Fb; during the accelerating falling process of the tool string, the force relationship of the tool string is: Gm > Fa + Fb + Fc; during the decelerating falling process of the tool string, the force relationship of the tool string is: Gm < Fa + Fb + Fc; during the uniform falling process of the tool string, the force relationship of the tool string is: Gm = Fa + Fb + Fc.

[0020] Referring to the appended Figure 2 , the magnet 2 is a cylindrical magnet, and the magnet 2 is a neodymium iron boron magnet. The material of the fixed connection device 3 is a non-ferromagnetic material, including an outer cylinder 31 and an upper gland A 30. A cylindrical space is machined inside the outer cylinder 31, and the cylindrical magnet 2 is installed in the cylindrical space of the outer cylinder 31 and fixed by installing the upper gland A 30 at the upper end. The fixed connection device 3 is connected to the tool 4 by a hinge mechanism 32.

[0021] The magnet 2 may be an electromagnet. The tool string falling speed V is between 0.5 m / s and 6 m / s. The material of the fixing connection device 3 is preferably copper, aluminum or plastic.

[0022] Embodiment 2, refer to the attached Figure 3 , the magnet 2 is changed into a circular ring magnet; the material of the fixed connection device 3 is a non-ferromagnetic material, including a core shaft 34 and an upper pressure cover B33, the upper part of the core shaft 34 is a stepped shaft, the circular ring magnet 2 is inserted into the outside, and is fixed on the core shaft 34 with an upper pressure cover B33.

[0023] Embodiment 3, refer to the attached Figure 4 On the basis of the second embodiment, a circular anti-collision sleeve 35 is set on the outside of the circular magnet 2, and a yoke 36 is installed on the upper and lower parts of the magnet 2 to guide the magnetic lines of force to cut the wall of the metal pipe column. Embodiment 1, a tool delivery device in a metal pipe column, comprising a magnet 2 and a fixed connection device 3; the magnet 2 is a magnetic field generating device, and the magnet 2 is installed with a yoke on the upper and lower parts to guide the magnetic lines of force; the magnet 2 is installed on the fixed connection device 3, and a connecting piece is provided at the lower part of the fixed connection device 3.

[0024] The above embodiment further includes:

[0025] A straightening piece is arranged around the fixed connection device 3 .

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tool delivery device inside a metal pipe column, characterized in that: It includes a magnet (2) and a fixed connection device (3); the magnet (2) is a magnetic field generating device, and magnetic yokes are installed above and below the magnet (2) to guide magnetic field lines; the magnet (2) is installed on the fixed connection device (3), and a connecting piece is provided at the lower part of the fixed connection device (3); the lower part of the fixed connection device (3) is connected to a tool 4 that needs to be delivered downward inside the metal pipe column (1); the magnet (2), the fixed connection device (3) and the tool 4 are installed as a tool string and released in the inner hole of the metal pipe column (1); the magnet (2) moves downward relative to the metal pipe column, and an induced current is generated on the wall of the metal pipe column (1), and the induced current prevents the magnet (2) from falling. The upward damping force of the induced current on the magnet (2) is Fc, and the damping force Fc is proportional to the falling speed V of the tool string; the axial component force of the suction force formed between the magnet (2) and the metal pipe column (1) is Fa, and an upward frictional force Fb is generated when the tool string contacts the inner wall of the pipe column (1); the gravity of the tool string is Gm; when the falling speed of the tool string is zero, the force relationship of the tool string is: Gm > Fa + Fb; during the accelerated falling process of the tool string, the force relationship of the tool string is: Gm > Fa + Fb + Fc; during the decelerated falling process of the tool string, the force relationship of the tool string is: Gm < Fa + Fb + Fc; during the uniform falling process of the tool string, the force relationship of the tool string is: Gm = Fa + Fb + Fc.

2. The tool delivery device inside a metal pipe column according to claim 1, characterized in that, the magnet (2) is a cylindrical magnet.

3. The tool delivery device inside a metal pipe column according to claim 1, characterized in that, the magnet (2) is an annular magnet.

4. The tool delivery device inside a metal pipe column according to claim 1 or 2, 3, characterized in that, the magnet (2) is a neodymium iron boron magnet.

5. The tool delivery device inside a metal pipe column according to claim 4, characterized in that, the material of the fixed connection device (3) is a non-ferromagnetic material.

6. The tool delivery device inside a metal pipe column according to claim 5, characterized in that, the connecting piece of the fixed connection device (3) is an articulated connection method; a centralizer is provided around the fixed connection device (3).

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