CN215718603U

CN215718603U - Pressure butt-buckling sealing oil pipe plug

Info

Publication number: CN215718603U
Application number: CN202121485343.3U
Authority: CN
Inventors: 黎石松; 何东; 叶超; 徐平; 李文涛; 党玉峰; 魏峰; 才晓宇
Original assignee: CNOOC Energy Technology and Services Ltd
Current assignee: CNOOC Energy Technology and Services Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-02-01
Anticipated expiration: 2031-06-30

Abstract

The utility model discloses a press butt-joint sealing tubing plug which comprises a tubing coupling, a double-male tubing nipple, a guide cone and a guide shoe, wherein external threads are processed on the outer side of the lower end of the tubing coupling and are connected with internal threads of the guide shoe; external threads are respectively processed on the outer sides of the upper end and the lower end of the double-male tubing nipple and can be respectively connected with a tubing coupling and a tubing coupling to be salvaged, and internal threads are processed inside the lower end of the double-male tubing nipple and are connected with a guide cone; the upper part of the guide cone is connected with the internal thread at the lower end of the double male tubing nipple through an external thread, the lower part of the guide cone is processed with a cone, the upper part of the guide shoe is processed with an internal thread and is connected with the external thread of the tubing coupling, and the inner side of the lower part of the guide shoe is provided with a chamfer angle for guiding the tubing coupling to be fished into the guide shoe.

Description

Pressure butt-buckling sealing oil pipe plug

Technical Field

The utility model belongs to the technical field of pressurized workover operations, and particularly relates to a pressurized butt-buckling sealing oil pipe plug.

Background

Before construction with pressure operation, a sealing tool needs to be put into a downhole string to block a pressure channel in a well, so that fluid in the well cannot be ejected out of the string, and the operation is the pressure control in an oil pipe. However, due to the influence of the pipe column inner diameter variation factors such as scaling of the inner wall of the underground oil pipe, deformation of the underground oil pipe, and drift diameter variation of underground tools, the pressure control tools in the oil pipe such as an oil pipe plug or an oil pipe bridge plug cannot be put down to the tail part of the pipe column to plug the pressure in the whole well pipe column. Therefore, a segmented tubing internal pressure control technology is needed to be adopted to lift out a tubing string in a well, namely, the tubing at the lower part of an tubing internal pressure control tool is firstly turned over in a pressurized operation machine, then a tool capable of sealing a fish top is put in to be buckled with a tubing coupling, and finally the sealed tubing string can be lifted out under pressure, so that the purpose of well control safety in the pressurized operation process is achieved.

The existing pressing and buckling tool mainly has two types:

one is the tubing plug valve. The closed oil pipe plug valve is connected to the bottom of the oil pipe, and the pressure in the oil pipe is controlled by the plug valve after buckling. Adopt oil pipe plug valve to take area to press the knot, because the plug valve external diameter is less, be difficult for taking and press the operation built-in centre, not only when the machine of lifting pushes down the plug valve, can make the plug valve deviate the center pin and destroy the fish top, still can appear when the knot phenomenon partially, influence the joint strength and the sealing performance of plug valve.

And the other is a fish top blanking plug. The lower end of the split fishing spear with the guide shoe is connected with the sealing leather cup, and under the action of the guide shoe, the split fishing spear can fish an oil pipe coupling by pressing the lifting machine downwards, and the sealing leather cup seals the pressure in the oil pipe under the action of the pressure in the well. When the pressure control operation in the segmented oil pipe is carried out, the split fishing spear is frequently used for fishing the oil pipe coupling, so that slips of the split fishing spear are easily abraded to cause underground falling objects; in addition, when the pressure in the well is small (the pressure in the well is lower than 5MPa generally), the sealing leather cup can not expand the sealing oil pipe, and when the pressure in the well is high (the pressure in the well is higher than 14MPa generally), the sealing leather cup is broken and fails.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides an oil pipe internal pressure control tool under the condition that the drift diameter is reduced, such as scaling on the inner wall of a pipe column, deformation of an oil pipe, a small drift diameter tool arranged on the pipe column and the like, so as to achieve the purpose of lifting the oil pipe and controlling the oil pipe internal pressure in the process of working under pressure.

The utility model is realized by the following technical scheme:

a kind of belt press is buckled to seal the oil pipe blanking plug, including the tubing coupling, one pair of public tubing pipe nipple joints, guide cone and guide shoe;

the lower end of the tubing coupling is connected with the internal thread at the upper end of the guide shoe through the external thread thereof, the lower end of the tubing coupling is connected with the internal thread at the upper end of the double male tubing nipple through the internal thread thereof, and the guide cone is connected with the internal thread at the lower end of the double male tubing nipple through the external thread at the upper end thereof.

In the technical scheme, the upper end of the tubing coupling is provided with internal threads.

In the above technical solution, the lower end of the guide cone is conical.

In the technical scheme, the lower end of the guide shoe is provided with an inner chamfer.

The utility model has the advantages and beneficial effects that:

Drawings

FIG. 1 is a schematic diagram of the present invention.

Wherein: 1 is an oil pipe coupling, 2 is a double male oil pipe nipple, 3 is a guide cone, and 4 is a guide shoe.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.

Example 1

A pressure butt-buckling sealing tubing plug comprises a tubing coupling 1, a double male tubing nipple 2, a guide cone 3 and a guide shoe 4,

the outer thread is processed in the outer side of the lower end of the oil pipe coupling 1, the inner thread is processed in the inner part of the oil pipe coupling, the outer threads are processed in the outer sides of the upper end and the lower end of the double male oil pipe nipple 2 respectively, the inner thread is processed in the lower end of the double male oil pipe nipple, the outer thread is processed on the upper part of the guide cone 3, the cone is processed on the lower part of the guide cone 3, the inner thread is processed on the upper part of the guide shoe 4, and the chamfer is arranged on the inner side of the lower part of the guide shoe.

In the embodiment, the outer side of the lower end of the tubing coupling 1 is processed with external threads and is connected with the inner threads of the guide shoe 4; the interior of the tubing coupling 1 is provided with internal threads which can be respectively connected with the fishing tubing on the upper part and the double male tubing short joint on the lower part.

In the embodiment, external threads are respectively processed on the outer sides of the upper end and the lower end of the double male tubing nipple 2 and can be respectively connected with the tubing coupling 1 and the tubing coupling to be salvaged; and internal threads are machined in the lower end of the double male oil pipe nipple 2 and are connected with the guide cone 3.

In the embodiment, the upper part of the guide cone 3 is connected with the internal thread at the lower end of the double male oil pipe nipple 2 through an external thread; the lower part of the guide cone 3 is provided with a cone, when the butt joint is carried out, the guide cone 3 can guide the lower end of the double male tubing nipple to enter a tubing coupling for fishing, and simultaneously, the pressure channel of the double male tubing nipple is sealed.

In the embodiment, the upper part of the guide shoe 4 is processed with internal threads and is in threaded connection with the outer part 1 of the tubing coupling; and a chamfer is arranged on the inner side of the lower part of the guide shoe 4 and used for guiding the tubing coupling to be fished into the guide shoe.

Example 2

When the oil pipe plugging device with the press buckling sealing in the embodiment 1 is used, the operation process is as follows:

connecting the upper part of a tubing coupling 1 of the tubing plug with press buckling and sealing in embodiment 1 with a tubing; an oil pipe connected with the upper part of the oil pipe coupling 1 is pressed down by a lifter operated under pressure to be blocked in the operation machine under pressure; under the action of the centralizing and righting functions of the guide shoe 4, the tubing coupling to be fished is automatically guided into the guide shoe 4; the double male tubing nipple 2 arranged in the guide shoe 4 automatically enters the tubing coupling to be salvaged under the guide of the guide cone 3; the oil pipe connected with the upper part of the oil pipe coupling 1 is rotated under pressure, and the oil pipe can be buckled under pressure; the guide cone 3 seals the pressure channel of the double male short section, so that the pressure of the oil pipe in the well is controlled below the guide cone 3; and lifting the oil pipe plug out of the wellhead under pressure to realize the control of the pressure in the oil pipe.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The utility model has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the utility model fall within the scope of the utility model.

Claims

1. The utility model provides a take pressure to detain sealed tubing plug which characterized in that: comprises an oil pipe coupling, a double male oil pipe nipple, a guide cone and a guide shoe;

2. The tubing plug of claim 1, wherein the tubing plug comprises: the upper end of the tubing coupling is provided with internal threads.

3. The tubing plug of claim 1, wherein the tubing plug comprises: the lower end part of the guide cone is conical.

4. The tubing plug of claim 1, wherein the tubing plug comprises: the lower end of the guide shoe is provided with an inner chamfer.