CN218510425U - Pressure balance type pipeline blocking isolation bag - Google Patents

Abstract

A pressure balance type pipeline blocking and isolating bag relates to a pipeline blocking and isolating bag, and comprises a bag body (1), a bag head (2), a nitrogen injection pipe (3), a communicating pipe (4) and a discharge port (5); the connection structure comprises a nitrogen gas source outlet connected with a nitrogen gas injection pipe (3), the other end of the nitrogen gas injection pipe (3) is connected with a capsule head (2), the capsule head (2) and a capsule body (1) are vulcanized and formed into a whole, and the capsule head (2) is connected with a communicating pipe (4) in the capsule body (1); the other side of the communicating pipe (4) is connected with the discharging port (5) in the capsule body (1), and the other side of the discharging port (5) is connected with a discharging pipe. The utility model discloses pipeline shutoff isolation bag designs for the isolation bag of a drainage the place ahead medium to make it realize pressure balance, this kind of isolation bag when aerifing and reaching the isolation effect, piles up the medium to the place ahead and carries out the drainage, has avoided the isolation bag by the risk of pass and damage.

Description

Pressure balance type pipeline blocking isolation bag

Technical Field

The utility model relates to a pipeline shutoff keeps apart the bag, especially relates to a pressure balance type pipeline shutoff keeps apart bag.

Background

The butter sac technology for pipeline plugging is a new technology for pipeline plugging by organically combining an isolation sac and a butter wall, namely, an inflatable sac is added into a pipe section needing to be fired, and the butter wall is piled outside the inflatable sac to form two-way sealing isolation for oil or gas in the pipeline, so that the construction risk of the oil pipeline is reduced, and the safety and reliability of firing are guaranteed. The isolation bag is generally made of an oil-resistant rubber composite fiber cloth as a main body material, and the thickness of the isolation bag is much thinner than that of the blocking bag and the ductility of the isolation bag is not high. The pressure in the isolating bag is generally not higher than 0.5 kg, so that the isolating bag is only used as an isolating medium in use and cannot block fluid under pressure.

However, in the disc type high-pressure plugging, due to the influence of multiple factors such as scrap iron during hole opening, the integrity of a leather cup of the plugging head and the like, the plugging effect is accidental, the situation of medium micro-seepage is often accompanied, and if micro-seepage exists, the seepage medium can be accumulated between the rear part of the plugging head and the isolation bag. The accumulated media will be pushed or damaged by more and more isolating bags and butter walls which cannot bear such thrust.

Disclosure of Invention

An object of the utility model is to provide a pressure balance type pipeline shutoff keeps apart bag, the utility model discloses pipeline shutoff keeps apart the bag design for the isolation bag of drainage the place ahead medium to make it realize pressure balance, this kind of isolation bag when aerifing to reach the isolation effect, piles up the medium to the place ahead and carries out the drainage, has avoided keeping apart the risk that the bag was passed and damaged.

The utility model aims at realizing through the following technical scheme:

a pressure balance type pipeline plugging isolating bag comprises a bag body, a bag head, a nitrogen injection pipe, a communicating pipe and a discharge port; the connection structure comprises a nitrogen gas source outlet connected with a nitrogen gas injection pipe, the other end of the nitrogen gas injection pipe is connected with a capsule head, the capsule head and a capsule body are vulcanized and molded into a whole, and the capsule head is connected with a communicating pipe inside the capsule body; the other side of the communicating pipe is connected with the discharge port in the capsule body, and the other side of the discharge port is connected with the discharge pipe.

The pressure balance type pipeline plugging isolation bag has the working pressure of 0.05MPa

The utility model has the advantages and effects that:

the invention relates to an isolation bag capable of discharging accumulated media in front of drainage. The bag can discharge the accumulated media in front while being inflated to achieve the isolation effect, and the risk that the isolation bag is pushed and damaged is avoided.

The invention has the characteristics of simple structure, simple and convenient operation, safety and reliability.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the utility model used in the pipeline.

In the figure: a capsule body 1, a capsule head 2, a nitrogen gas injection pipe 3, a communicating pipe 4 and a discharge port 5.

Detailed Description

The present invention will be described in detail with reference to the embodiments shown in the drawings.

The basic structure of the pressure balance type pipeline isolation bag comprises the following parts, namely a bag body 1: the oil-resistant rubber composite fiber cloth is used as a main body material, is light, thin, foldable, has a small amount of ductility, expands and then is attached to the inner wall of the pipeline to play an isolation role; a capsule head 2: the metal material is mainly used for providing a pressing interface and fixing a communicating pipeline; nitrogen gas injection pipe 3: one end of the inflation tube is connected with the bag head, and the other end of the inflation tube is connected with a nitrogen or other inert gas source to realize inflation of the bag so as to expand the bag; communication pipe 4: the material is a rubber hose, and the isolation bag is different from the traditional isolation bag, and the structure can communicate the front space and the rear space of the isolation bag and ensure that the inflation state of the isolation bag realizes the medium discharge in the upstream cavity. Drain interface 5: the discharge pipe is connected with the discharge rubber pipe, is led out from the pipeline fracture through the butter wall and can collect the leaked medium. The nitrogen source outlet is connected with the nitrogen injection pipe 3, the other end of the nitrogen injection pipe 3 is connected with the capsule head 2, the capsule head 2 and the capsule body 1 are vulcanized and molded into a whole, and the capsule head 2 is connected with the communicating pipe 4 in the capsule body 1. The other side of the communicating pipe 4 is connected with a drain port 5 in the capsule body 1, and the other side of the drain port 5 is connected with a drain pipe.

The utility model discloses an operating parameter: working pressure: 0.05MPa; burst pressure: 0.08MPa; working medium: water, crude oil, natural gas; applicable pipe diameter: the method is specifically equipped according to the pipeline parameters.

When in use, high-pressure and low-pressure plugging is implemented according to the firing construction process flow, the medium in the original pipeline is discharged, and after the pipe cutting operation is carried out, the butter sack operation can be carried out. The isolation bag is made of oil-resistant rubber composite fiber cloth, the test pressure is 0.08MPa, and the inflation medium is preferably nitrogen or other inert gases. Putting the isolation bag into the pipe section, and leading out the nitrogen injection pipe and the traction rope of the isolation bag from the bag taking hole; fixing the isolation bag by using a fixing rope and a flange, connecting a nitrogen injection pipe with a nitrogen gas cylinder, injecting nitrogen into the isolation bag, observing the injection amount and the injection pressure of the nitrogen through a pressure gauge on the gas cylinder, controlling the inflation pressure to be about 0.05MPa, and ensuring that the pressure value is kept hidden; covering a blind flange, and sealing; after the isolation bag is inflated, the discharge pipe is led out from the direction of the pipeline port, and the butter wall of the isolation bag can be used for monitoring the nitrogen pressure by a special person and making a record, wherein the key point is that the isolation bag is placed into the initial isolation stage; and (4) well balancing drainage, irregularly observing whether oil seepage occurs in the pipeline outside the isolation bag, and once oil seepage occurs, removing the oil seepage of the pipeline by using the small oil well pump. When the isolating bag is withdrawn, measures are taken to eliminate accumulated static charges at the bag head to prevent static sparks from being generated to ignite oil gas in the pipe; arranging an electrostatic grounding device near the ignition point, wherein the grounding resistance is less than 10Q in the test; the grounding device is then reliably connected with copper wires for construction facilities, machines and vehicles, so as to eliminate the electrostatic spark phenomenon caused by potential difference. When the isolation capsule is extracted, the risk of electrostatic hidden danger can be reduced by adopting a watering mode. The requirement on the construction environment temperature is met when the fire construction is carried out in the season that the temperature exceeds 20 ℃ and the sunlight is directly sunned strongly, and the measures for the cooling treatment of the butter wall are taken. If a protective cover or a protective curtain is added outside the pipe section for installing the oil-gas isolation bag and the butter wall, water is not added at fixed time for cooling, and the butter wall is prevented from melting and collapsing due to high temperature. And (3) micro-seepage treatment of a plugging medium, namely performing process blocking or plugging operation on the pipeline, emptying the medium in the construction pipe section after the detection confirms that the oil-gas medium in the pipeline is effectively blocked, and continuously observing whether the medium in the pipe is changed before the pipeline is cut, so that the uncontrollable condition of a large amount of oil seepage caused by plugging or poor control of a process valve is avoided. After the pipeline is disconnected, under special conditions, if a process is found to block or block a trace amount of leakage, the fire safety is not influenced after confirmation, the operation can be continued in a butter sac isolation mode, the isolation sac is rapidly placed in the pipeline section, and the slightly leaked medium is safely discharged from the overflow hole. During the operation of fire, the welding can be stopped intermittently, the overflow hole is opened, the medium in the pipeline is pumped and discharged, the sealed connection mode is recovered after the medium is completely discharged, and the fire welding is continued. The process should ensure that the shutdown time of the live fire pipeline is controlled within a minimum range.

Claims (2)

1. A pressure balance type pipeline plugging isolation capsule is characterized by comprising a capsule body (1), a capsule head (2), a nitrogen injection pipe (3), a communicating pipe (4) and a discharge port (5); the connection structure comprises a nitrogen gas source outlet connected with a nitrogen gas injection pipe (3), the other end of the nitrogen gas injection pipe (3) is connected with a capsule head (2), the capsule head (2) and a capsule body (1) are vulcanized and formed into a whole, and the capsule head (2) is connected with a communicating pipe (4) in the capsule body (1); the other side of the communicating pipe (4) is connected with the discharging port (5) in the capsule body (1), and the other side of the discharging port (5) is connected with a discharging pipe.

2. The pressure balance type pipe plugging isolating bag as claimed in claim 1, wherein the operating pressure of the isolating bag is 0.05MPa.

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