Rubber seals for closing devices operating in cold climates degrade quickly in aggressive environments at very low temperatures. As a result, leaks and failures occur in the closure devices. Therefore, there is a great need to develop a new model of rubber seals and develop their scientific basis.
The article is devoted to increasing the sealing effect of rubber seals of machines and equipment, including closures, by introducing the anisotropy of the rubber matrix into its structure with control of the characteristics of hard closures obtained from rubber. For this purpose, new models of the gate valve design were obtained and new models of two-layer panel seals based on a modified rubber elastomer matrix are applied to these structures.
For this, a test program is carried out in the form of an analytical trajectory of large, medium and small constant curves in two closed forms based on characteristic deformations to study the anisotropy of matrix deformations. It is found that the eigenvector of the deformation anisotropy of the matrix is not in the load trajectory before it collapses, it arises with a delay. This delay slows down the rate of destruction.
This property of deceleration of the main eigenvector of the deformation anisotropy of the matrix is subjected to a very complex loading of the initial fields, in the latter sections it is also observed in samples No. 2, No. 3, tested along the trajectory of linear loading. This delay slows down the destruction rate.
Thus, the direction of the deceleration property of the main eigenvector can be considered quite common. This leads to an increase in its resistance to wear in a highly aggressive environment
Packers are downhole equipment that is essential equipment in well workover operations to protect the production string from reservoir pressure.
The sleeve assembly, which is the main assembly of the packer, requires that during setting the packer is not damaged and does not stick to the inside of the well when running into the well, and that the packer is set correctly. When mounting the packer in the well, it is necessary to ensure full balance.
To ensure balance when setting the packer, in workover wells, care must be taken to ensure that the packer is lowered into the well at low speed. When lowering the packer into the well, it is also necessary to control the descent speed and know the pattern of change in the dependence of the dynamic force on the descent speed. The calculation of the allowable compressive load on the packer equipment used in well repair is considered. A stability criterion is proposed that takes into account bending stresses that occur when a packer is mounted in a well.
Depending on the diameter of the tubing, the critical value of the compressive force acting on the packer was determined, and a new expression was obtained for calculating the allowable load acting on the packer used in the repair well. The critical compression force was calculated depending on the diameter of the well pipes.
Depending on the diameter of the tubing, the numerical values of the critical force on the packer were determined. It was found that the value of bending stresses as a criterion for static stability corresponds to 15% of the yield strength when the packer is mounted in a repair well.
When mounting the packer in repair wells, care must be taken to ensure that the packer is lowered into the well at low speed to ensure balance
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