Slip type fishing device special for underground throttler

Abstract

The invention provides a slip type fishing device special for an underground throttler. The slip type fishing device comprises an upper fixing connector, a barrel, a shaft core, a sleeve, a magnet fixing sleeve, a magnet, a first elastic cylindrical pin and a second elastic cylindrical pin. According to the slip type downhole throttler fishing device, firstly, the sleeve in the device is used for prizing the slip type downhole throttler, then the magnetic force of the magnet is used for adsorbing the slip type downhole throttler, and it can be guaranteed that the adsorbed slip type downhole throttler cannot be thrown off easily while effective fishing is conducted.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas field development, in particular to a special fishing device for a slip-type downhole choke. Background Art

[0002] As a gas field with low permeability, low pressure and low abundance, the Sulige gas field can realize low-cost development of the gas field. Among them, it is necessary to use the slip-type downhole choke to realize the throttling and pressure reduction of the natural gas in the wellbore and complete the low-cost development of the gas field. As the gas well production enters the middle and late stages, it is necessary to salvage the slip-type downhole choke with a production of less than 5,000 cubic meters / day or a pressure of less than 6MPa. When the ordinary planar strong magnetic salvage device in the prior art is used for salvage, most of the slip-type downhole chokes can be salvaged successfully, but the lower half of a part of the slip-type downhole choke will be separated from the upper half during the salvage process, resulting in only the upper half of the slip-type downhole choke being salvaged, and the lower half of the downhole choke being thrown into the downhole oil pipe. The three or four slips of the choke will fall into the annular gap formed by the core rod and the inner diameter of the oil pipe, forming a slip hard card, thereby affecting the normal production of the gas well and causing the production capacity of the gas well to decrease. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a special fishing device for a slip-type downhole choke, which can effectively salvage and ensure that the adsorbed slip-type downhole choke will not be easily thrown off, thereby effectively ensuring the production efficiency of the gas well.

[0004] In a first aspect, an embodiment of the present invention provides a special fishing device for a slip-type downhole choke, characterized in that it comprises:

[0005] An upper fixed joint and a cylinder, wherein the cylinder comprises an axis core, a sleeve, a magnet fixing sleeve, a magnet, a first elastic cylindrical pin, and a second elastic cylindrical pin;

[0006] Wherein, the upper fixed joint is provided on the left side of the cylinder;

[0007] In the cylinder, the shaft core is located inside the sleeve, the first elastic cylindrical pin and the second elastic cylindrical pin are respectively provided at both ends of the shaft core, and the magnet fixing sleeve is provided on the right side of the shaft core;

[0008] The magnet is arranged inside the magnet fixing sleeve, and the sleeve is arranged outside the magnet fixing sleeve.

[0009] Preferably, in the special fishing device for slip-type downhole choke:

[0010] The upper fixed joint is fixed to the upper part of the shaft core in the cylinder through the first elastic cylindrical pin and is fixedly connected to the shaft core;

[0011] The magnet fixing sleeve is fixed to the upper part of the shaft core through the second elastic cylindrical pin, the magnet fixing sleeve is fixedly connected to the shaft core, detachably connected to the magnet, and detachably connected to the sleeve;

[0012] The sleeve is detachably connected to the second elastic cylindrical pin and the shaft core respectively, and is in contact with the upper fixed joint;

[0013] Preferably, the length of the sleeve is greater than the length of the magnet fixing sleeve.

[0014] Preferably, the sleeve has non-magnetic properties.

[0015] The beneficial effects of the present invention are as follows:

[0016] First, the sleeve in the device is used to clamp the slip-type downhole choke, and then the magnetic force of the magnet is used to adsorb the slip-type downhole choke, and the sleeve is used to isolate the oil pipe from the slip-type downhole choke. While effectively salvaging, it is ensured that the adsorbed slip-type downhole choke will not be easily thrown off, thereby effectively ensuring the production efficiency of the gas well; at the same time, the special salvaging device for the slip-type downhole choke provided by the present invention is easy to assemble, which is conducive to the maintenance and maintenance of the device.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a special fishing device for a slip-type downhole choke provided in an embodiment of the present invention.

[0021] Among them, 1-upper fixed joint; 2-cylinder; 201-axis core; 202-sleeve; 203-magnet fixing sleeve; 204-magnet; 205-first elastic cylindrical pin; 206-second elastic cylindrical pin. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0023] The embodiment of the present invention provides a special fishing device for a slip-type downhole choke, which can effectively fish out the slip-type downhole choke and ensure that the adsorbed slip-type downhole choke will not be easily dropped, thereby effectively ensuring the production efficiency of the gas well.

[0024] To facilitate understanding of this embodiment, Figure 1 A special fishing device for a slip-type downhole choke disclosed in an embodiment of the present invention is introduced in detail.

[0025] Embodiment 1:

[0026] The embodiment of the present invention provides a special fishing device for a slip-type downhole choke, comprising:

[0027] The upper fixed joint 1 and the cylinder 2, wherein the cylinder 2 comprises an axis core 201, a sleeve 202, a magnet fixing sleeve 203, a magnet 204, a first elastic cylindrical pin 205, and a second elastic cylindrical pin 206;

[0028] The upper fixed joint 1 is provided on the left side of the cylinder 2; the upper fixed joint 1 is fixed to the upper part of the shaft core 201 in the cylinder 2 through a first elastic cylindrical pin 205, and is fixedly connected to the shaft core 201;

[0029] In the cylinder 2, a first elastic cylindrical pin 205 and a second elastic cylindrical pin 206 are respectively provided at both ends of the shaft core 201, and a magnet fixing sleeve 203 is provided on the right side of the shaft core 201; a magnet 204 is provided inside the magnet fixing sleeve 203, and a sleeve 202 is provided outside the magnet fixing sleeve 203;

[0030] The magnet fixing sleeve 203 is fixed to the upper part of the shaft core 201 through the second elastic cylindrical pin 206. The magnet fixing sleeve 203 is fixedly connected to the shaft core 201, detachably connected to the magnet 204, and detachably connected to the sleeve 202.

[0031] The sleeve 202 is detachably connected to the second elastic cylindrical pin 206 and the shaft core 201 respectively, and is in contact with the upper fixed joint 1 .

[0032] Preferably, the length of the sleeve 202 is greater than the length of the magnet fixing sleeve 203 .

[0033] Preferably, the sleeve 202 has non-magnetic properties.

[0034] In this embodiment, the magnet 204 is a strong magnet.

[0035] The working principle of the present invention is as follows:

[0036] The special fishing device for the slip-type downhole choke provided in the embodiment of the present invention is lowered into the oil and gas well, the slip-type downhole choke is clamped by the sleeve 202, and then the slip-type downhole choke is adsorbed by the magnetic force of the magnet 204. After the slip-type downhole choke is successfully adsorbed, the special fishing device for the slip-type downhole choke is lifted out of the oil and gas well. At this time, the sleeve 202 moves downward, and the non-magnetic property of the sleeve 202 is used to eliminate the influence of the magnetic force of the magnet 204 on the oil pipe, and the adsorbed slip-type downhole choke is separated from the oil pipe to prevent the oil pipe from repeatedly contacting the slip-type downhole choke, resulting in the slip-type downhole choke being easily thrown off due to excessive swing amplitude during the fishing process.

[0037] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A special fishing device for a slip-type downhole choke, characterized in that: include: An upper fixed joint and a cylinder, wherein the cylinder comprises an axis core, a sleeve, a magnet fixing sleeve, a magnet, a first elastic cylindrical pin, and a second elastic cylindrical pin; Wherein, the upper fixed joint is provided on the left side of the cylinder; In the cylinder, the shaft core is located inside the sleeve, the first elastic cylindrical pin and the second elastic cylindrical pin are respectively provided at both ends of the shaft core, and the magnet fixing sleeve is provided on the right side of the shaft core; The magnet is arranged inside the magnet fixing sleeve, and the sleeve is arranged outside the magnet fixing sleeve.

2. A special fishing device for slip-type downhole choke according to claim 1, characterized in that: In the special fishing device for slip-type downhole choke: The upper fixed joint is fixed to the upper part of the shaft core in the cylinder through the first elastic cylindrical pin and is fixedly connected to the shaft core; The magnet fixing sleeve is fixed to the upper part of the shaft core through the second elastic cylindrical pin, the magnet fixing sleeve is fixedly connected to the shaft core, detachably connected to the magnet, and detachably connected to the sleeve; The sleeve is detachably connected to the second elastic cylindrical pin and the shaft core respectively, and is in contact with the upper fixed joint.

3. A special fishing device for slip-type downhole choke according to claim 1, characterized in that: Also includes: The length of the sleeve is greater than the length of the magnet fixing sleeve.

4. A special fishing device for slip-type downhole choke according to claim 1, characterized in that: Also includes: The sleeve has non-magnetic properties.

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