INVESTIGATION OF THE SEALING UNIT OF THE ANNULAR PREVENTER

Abstract

In this article, different kinds of sealing aspects for something like an annular тpreventer are looked at. It was looked at how spherical and cone-shaped sealing elements are made. The advancement of spherical seals has been looked into based on what other countries were doing. The sealing parts that are presently used for spherical circumferential preventers aren't really universal and only work with a small number of drill pipes. They also can't completely seal the well mouth when there are no drilling tools in the well. A seal for a annular-type preventer is considered. The sealer includes a large number of metal inserts embedded in the elastomeric body. The inserts are arranged radially at equal distances from each other around the longitudinal axis of the seal. They support the elastomeric body under radial compression, which ensures the sealing of the annular space. When the sealing assembly is compressed around the drill pipe, the elastomeric body is compressed radially in the direction of the longitudinal axis. Metal inserts move in the same direction. The disadvantage of this design is that in the closed position, the pressure in the borehole can affect the elastomeric body, which leads to a change in its stress state. As a result, significant stresses develop in certain areas of the elastomeric body, acting on the sealing assembly in two directions: radially to the center and along the longitudinal axis upwards. At significant pressures of the reservoir fluid, stresses can lead to the destruction of the seal. An annular sealing element placed between the lid and the plunger of a spherical annular preventer has been studied. The element is installed in the spherical cavity of the lid and consists of an elastic material reinforced with rigid inserts. This design has a disadvantage associated with the wear of the working surfaces. When the tool is axially moved through a closed sealing element, a narrow belt of elastic material near the inner upper edge of the sealing element first wears out. Then, as it wears out, the width of the belt increases, reaching full height at the end. Keywords: circular sealing element, cylindrical sealing element, strengthened metal inserts, elastomeric body, annular preventer.