"assistant pressure plugging technology is an important technical means widely used in oil and gas exploitation, drilling, engineering construction and other fields. It is mainly used for downhole wellhead sealing, quick closing of drilling pipe, emergency workover, preventing blowout, preventing pressure leakage and so on. In this paper, the principle and structure of sealing with pressure are introduced in detail, so that readers can have a more comprehensive understanding of this technology.

First, the principle of sealing with pressure

The principle of plugging technology with pressure is to control the downhole pressure and prevent the leakage of well fluid by installing plugging equipment in the well head or shaft. During drilling, underground operation or wellhead control, different degrees of underground pressure may be generated due to formation pressure, drilling fluid, gas and other factors, and the pressure plugging technology can block the underground pressure through the equipment to ensure the smooth progress of underground operation.

The principle of sealing with pressure mainly includes the following points:

1. ** Downhole pressure control ** : In the process of drilling or downhole operation, formation pressure and drilling fluid pressure have pressure effects on the wellhead, and it is necessary to control the downhole pressure in time through pressure sealing technology to avoid the occurrence of out-of-control phenomenon of the wellhead, so as to ensure the operation.

2. ** Fast plugging ** : The pressure plugging technology has the ability to quickly plug the wellbore. Once the wellhead is accidentally opened or other unexpected situations occur, the plugging effect can be quickly applied to curb the well fluid leakage, and ensure the downhole equipment and operators.

3. Prevent blowout ** : In downhole operations, once the sudden increase of bottom hole pressure leads to blowout, it will cause serious harm to downhole equipment and operators, and pressure plugging technology can effectively prevent blowout phenomenon and reduce the risk of accidents.

4. ** Multi-layer plugging ** : The pressure plugging technology can achieve multi-layer plugging, that is, multiple plugging devices are set in the wellhead or wellbore to form multiple protection mechanisms to improve the plugging effect and stability.

2. Structure with pressure sealing

The structure with pressure sealing technology usually includes the sealing apparatus, the control system, the transmission pipeline and other components, the main characteristics of these structures are described below:

1. ** Plugging appliance ** : The plugging appliance is the core component of the plugging technology with pressure, and its structural design mainly includes the plugging head, sealing ring, piston, spring, etc. Plugging tools According to the operation requirements and different wellhead size, you can choose different specifications and models of plugging tools.

2. ** Control system ** : The operation with pressure sealing needs to be equipped with the corresponding control system, including control panel, hydraulic pump station, control valve, etc. The control system can realize the remote operation and control of the plugging equipment to ensure the accuracy and timeliness of the plugging operation.

3. ** Transportation pipeline ** : The transportation pipeline is used to transport liquid or gas medium, and the plugging liquid or gas is sent to the inside of the plugging device to realize the sealing of the wellhead or wellbore. The pipeline is usually made of special materials that are resistant to pressure and corrosion to meet the requirements of the harsh underground environment.

4. ** Stability protection device ** : pressure sealing operation involves high pressure liquid or gas, there is a certain stability risk, so there are usually protective devices on the pressure sealing device, such as pressure gauges, stability valves, etc., for monitoring and releasing abnormal pressure to ensure the stability of operators and equipment.

Through the comprehensive understanding of the principle and structure of the pressure sealing technology, it can be better applied in the underground operation, to ensure the stability and efficiency of the operation, and to improve the quality and efficiency of the work. I hope this paper can provide readers with useful reference and inspiration.