Pressure plugging is a common engineering technique widely used in petroleum, weather, sewer and other related fields. Its principle is to use high pressure liquid or gas to force the medium in the pipeline to a blocked area to achieve the purpose of blocking the pipeline. This paper will discuss the application principle of pressure sealing and its application in engineering.

First, the basic principle of sealing with pressure

Pressure plugging is the purpose of plugging the pipeline by injecting high pressure liquid or gas into the pipeline, so that the medium in the pipeline is forced, so as to achieve the purpose of plugging the pipeline. In practical applications, the plugging equipment usually used, such as the plugging device, plugging material, etc., will force the medium in the pipeline to a certain area to form the sealing effect.

The principle of sealing with pressure can be simply summarized as the following steps:

1. Preparations: Determine the plugging area and select appropriate plugging devices and materials. Check the pipeline for leaks to ensure stability.

2. Pressure injection: The use of high pressure pumps or other equipment to inject liquid or gas into the pipeline to increase the pressure in the pipeline. The injection of high pressure liquid or gas forces the medium in the pipeline to move towards the blocked area.

3. Blocking effect: The medium in the pipeline is forced to the blocking area to form a blocking effect. The plugging effect depends on the selection of the plugging equipment and the plugging material, as well as the pressure and medium properties in the pipeline.

4. Pressure release: After completing the plugging operation, gradually release the pressure in the pipeline, remove the plugging equipment and materials, and restore the normal use of the pipeline.

Second, the application field with pressure sealing

Pressure plugging has a wide range of applications in oil, gas, groundwater pipelines and other fields, mainly including the following aspects:

1. Pipeline maintenance: In the process of pipeline maintenance and repair, it is often necessary to plug the pipeline to ensure the work area. Sealing with pressure can effectively seal the pipeline and reduce the risk of leakage.

2. Pipeline testing: In the process of pipeline testing and inspection, the pipeline needs to be blocked to ensure the accuracy of the test. The sealing with pressure can provide a stable sealing effect and ensure the smooth test.

3. Emergency handling: In case of pipeline leakage or other emergency events, the pipeline needs to be blocked to control the development of the situation. Sealing with pressure can seal the pipeline quickly and effectively and reduce the loss caused by accidents.

4. Engineering construction: In the new construction and renovation of pipelines, it is often necessary to block the pipelines for the next step. Sealing with pressure can provide temporary sealing effect and facilitate engineering construction.

Third, the advantages and disadvantages of pressure sealing

As a common pipeline plugging technique, pressure plugging has the following advantages:

1. High efficiency: with pressure plugging can quickly and effectively plug the pipeline, reduce the downtime of the project, improve work efficiency.

2. Flexibility: with pressure plugging can be selected according to different needs of the appropriate plugging equipment and plugging material, suitable for all kinds of pipeline plugging work.

3. Stability: Sealing with pressure can be carried out in the running state of the pipeline, reducing the impact on the pipeline system and improving the stability of the work.

However, pressure plugging also has some disadvantages, such as:

1. High cost: High cost of plugging equipment and plugging materials required for sealing with pressure. At the same time, the technical requirements for the plugging operators are also higher, which increases the maintenance cost.

2. Need to know: plugging with pressure requires knowledge and skills, high technical requirements for plugging operators, need to go through special training.

4. Impact on the pipeline system: Sealing with pressure may have a certain impact on the pipeline system, so it is necessary to exercise caution to avoid damage to the pipeline system.

In summary, as an important pipeline plugging technology, pressure plugging has important application value in the engineering field. Through in-depth understanding of the principle and application of sealing with pressure, we can better cope with pipeline maintenance, testing, emergency treatment and engineering construction and other situations to ensure the stable operation of pipeline system.