Tubing plug

Abstract

The utility model discloses an oil pipe blanking plug which comprises an upper connector, a central spindle is fixed in the upper connector through a pin, and a sealing ring is arranged between the central spindle and a columnar cavity. The mandrel is provided with an oil through cavity; a steel ball is arranged at the top of the oil passing cavity, a one-way sealing valve is arranged at the bottom of the oil passing cavity, a spring sleeves a valve rod of the sealing valve, a fixing shaft with a hole is connected to the lower end of the mandrel through threads, the valve rod of the sealing valve is arranged in the fixing shaft with the hole, and the lower end of the sealing valve penetrates through the fixing shaft with the hole and then is provided with a dissoluble metal sleeve. According to the scheme, before well completion operation, the blanking plug is connected to the lower portion of an oil pipe, a well completion pipe column is put down to the preset depth, a ball is thrown from a well opening, and the packer is pressurized and set; meanwhile, the dissolvable metal sleeve in the blanking plug is dissolved under the action of underground fluid, the sealing valve moves upwards under the tension action of the spring and makes contact with the central spindle to seal and cut the upper channel and the lower channel, and the sealing effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of oil port downhole operation tools, in particular to an oil pipe plugger. Background Art

[0002] During oil well production, workovers are often required due to reasons such as downhole tubing disconnection or wax removal. However, due to malfunction of the downhole well sealer switch, the oil layer cannot be sealed. Under the influence of formation pressure, the well fluid in the tubing will spray out or overflow to the wellhead when the tubing is pulled in and out, causing great pollution to the environment, resulting in waste of crude oil, and affecting the workers' operating environment, which is not conducive to environmental protection and the development of the oil field.

[0003] CN2003201315294 discloses an oil pipe plug, comprising an upper locking nut, a pressure plate, a support sleeve, a leather cup, a retaining ring, a rubber plug, a mandrel, a support ring, a lower locking nut, an anchor body, a slider, a block, and a support sleeve. The support sleeve is covered with a leather cup, which is mounted on top of the cup. The mandrel has an upper locking nut and a lower locking nut at each end. The mandrel is sequentially mounted with a rubber plug and a support ring. The anchor body is mounted with a slider and a block. The oil pipe plug is hydraulically delivered and sealed with rubber components. During high-pressure hydraulic delivery, the rubber components rub against the inner wall of the oil pipe, causing damage and affecting the sealing effect. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an oil pipe plugger to solve the above deficiencies.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An oil pipe plug includes an upper joint with a cylindrical cavity inside.

[0007] The core shaft is fixed in the upper joint by a pin, and a sealing ring is provided between the core shaft and the inner wall of the cylindrical cavity;

[0008] An oil passage cavity is provided at the axis of the core shaft;

[0009] A steel ball is placed on the top of the oil passage cavity, and a one-way sealing valve is provided at the bottom, with the plug of the sealing valve facing one end of the oil passage cavity;

[0010] A spring is sleeved on the outside of the valve stem of the sealing valve, and the top of the spring abuts against the lower end of the plug;

[0011] The fixed shaft with a hole is connected to the lower end of the core shaft through a thread, and the axis of the fixed shaft with a hole has a blind hole that does not go through, and the bottom of the spring is against the bottom of the hole of the fixed shaft with a hole;

[0012] The valve stem of the sealing valve is placed in the fixed shaft with a hole and a soluble metal sleeve is installed after the lower end penetrates the fixed shaft with a hole. The end of the valve stem of the sealing valve is provided with a limiting sleeve adjacent to the soluble metal sleeve.

[0013] Optionally, the material of the pin is brass.

[0014] Optionally, two pins are arranged side by side.

[0015] Beneficial effects

[0016] The solution of the present application is to connect the plug to the lower part of the oil pipe before the completion operation, lower the completion string to a predetermined depth, drop a steel ball from the wellhead, and pressurize the packer; at the same time, the soluble metal sleeve in the plug dissolves under the action of the downhole fluid, and the sealing valve moves upward under the action of the spring tension, contacts the core shaft, and seals the upper and lower channels, with a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view of the utility model;

[0018] Figure 2 This is the appearance diagram of the utility model;

[0019] The following are marked in the figure:

[0020] 1-upper joint, 2-restriction sleeve, 3-soluble metal sleeve, 4-fixed shaft with hole, 5-sealing valve, 6-spring, 7-core shaft, 8-sealing ring, 9-steel ball, 10-pin. DETAILED DESCRIPTION

[0021] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0022] See also Figures 1 to 2 The utility model provides an oil pipe plug, comprising an upper joint 1, wherein the upper joint 1 has a cylindrical cavity inside.

[0023] The core shaft 7 is fixed in the upper joint 1 by a pin 10, and a sealing ring 8 is provided between the core shaft 7 and the inner wall of the cylindrical cavity;

[0024] An oil passage cavity is provided at the axis of the core shaft 7;

[0025] A steel ball 9 is placed on the top of the oil passage cavity, and a one-way sealing valve 5 is provided at the bottom, with the plug of the sealing valve 5 facing one end of the oil passage cavity;

[0026] A spring 6 is sleeved on the outside of the valve stem of the sealing valve 5, and the top of the spring 6 abuts against the lower end of the plug;

[0027] The fixed shaft 4 with a hole is connected to the lower end of the core shaft 7 by a thread. The axis of the fixed shaft 4 with a hole has a blind hole. The bottom of the spring 6 is against the bottom of the hole of the fixed shaft 4 with a hole.

[0028] The valve stem of the sealing valve 5 is placed in the fixed shaft with a hole 4 and a soluble metal sleeve 3 is installed after the lower end penetrates the fixed shaft with a hole 4. The end of the valve stem of the sealing valve 5 is provided with a limiting sleeve 2 adjacent to the soluble metal sleeve 3.

[0029] The solution of the present application is to connect the plug to the lower part of the oil pipe before the completion operation, lower the completion string to a predetermined depth, throw a steel ball 9 from the wellhead, and pressurize the packer; at the same time, the soluble metal sleeve 3 in the plug is dissolved under the action of the downhole fluid, and the sealing valve 5 is displaced upward under the tension of the spring 6, and contacts the core shaft 7, thereby sealing the upper and lower channels and achieving a good sealing effect.

[0030] As an optional solution, the material of the pin 10 is brass, which is convenient for later shearing.

[0031] In order to increase the connection strength, two pins 10 are provided side by side.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0033] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An oil pipe plug, characterized in that: It includes an upper joint, wherein the upper joint has a cylindrical cavity inside. The core shaft is fixed in the upper joint by a pin, and a sealing ring is provided between the core shaft and the inner wall of the cylindrical cavity; An oil passage cavity is provided at the axis of the core shaft; A steel ball is placed on the top of the oil passage cavity, and a one-way sealing valve is provided at the bottom, with the plug of the sealing valve facing one end of the oil passage cavity; A spring is sleeved on the outside of the valve stem of the sealing valve, and the top of the spring abuts against the lower end of the plug; The fixed shaft with a hole is connected to the lower end of the core shaft through a thread, and the axis of the fixed shaft with a hole has a blind hole that does not go through, and the bottom of the spring is against the bottom of the hole of the fixed shaft with a hole; The valve stem of the sealing valve is placed in the fixed shaft with a hole and a soluble metal sleeve is installed after the lower end penetrates the fixed shaft with a hole. The end of the valve stem of the sealing valve is provided with a limiting sleeve adjacent to the soluble metal sleeve.

2. The oil pipe plug according to claim 1, characterized in that: The material of the pin is brass.

3. The oil pipe plug according to claim 1, characterized in that: Two pins are arranged side by side.

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