EFFECT OF BACK PRESSURE DURING DIRECT PRESETTING OF ALLOY LBTPN D16T

Abstract

Pipes made of high-strength aluminum alloys with protector thickeners in the middle and at the ends are actively used in the construction of wells for oil and gas. Their light weight and sufficient strength make it possible to build wells of greater depth from lower lifting capacity installations. In addition, aluminum alloy pipes of keyless construction are widely used in cases where there is a high content of carbon dioxide and hydrogen sulfide. This design and material make it possible to significantly increase the service life of pipes in aggressive, corrosive environments. In order to increase the production speed of pipes, it is proposed to use the technology of direct compression with back pressure. You can simulate the manufacturing process using this technology of LBTPN (alloy drill pipe of increased reliability) using a specialized software complex DEFORM, which was done. These aluminum pipes are used in the development of ultra-deep gas and oil wells, as well as horizontal and inclined extended reach wells. LBTPNs were also used in the drilling of ultra-deep Kola, Kryvyi Rih, and Ural wells. It is possible to use compressed pipes with back pressure if the design depth of the well is more than 3000 m. During pressing in the plastic deformation focus, stress transformation is observed: normal growth and drop of tangents and, therefore, a decrease in their total impact; increased level of hydrostatic pressure, all components of deformations and, therefore, also their total impact. Unlike the non-backpressure process, when present and under its action in the gage zone, there is a significant decrease in longitudinal tensile forces, as a result it is possible to carry out the process with higher values of alloy flow rates. Also, pipes made of aluminum alloys of a lock-free design are widely used in cases where there is a high content of carbon dioxide and hydrogen sulfide. This design and material can significantly increase the service life of pipes.