Abstract: The present invention addresses to an equipment for autonomous abandonment of wells, allocated in its position during the completion of the well. Such an equipment melts the string, cables and accessories and the casing by means of an exothermic reaction (which may have thermite among its reagents). The start of this reaction is remotely triggered according to the interest of the well operator. As a product of the process, there is the formation of a permanent barrier (BIS) to abandon the well. This permanent barrier will be the product of the residual material from the heat release reaction, a molten material from the string and casing, as well as the material responsible for the formation of the BIS, which shall have eutectic characteristics, that is, after its solidification it shall have an expansion in order to ensure that it generates rock-to-rock adhesion.

Abstract: The authentication method is based on the exchange of text messages between an User electronic equipment, in the form of a mobile phone terminal, and an Intermediary electronic equipment, and between a Manager electronic equipment and an Intermediary electronic equipment; upon a request of authentication of a User by a Manager to an Intermediary, the Intermediary electronic equipment sends to the mobile phone terminal an authentication key by means of an encrypted text message; the mobile phone terminal decrypts the encrypted text message via a cryptography key, the cryptography key has been previously encrypted via a PIN and stored inside the mobile phone terminal; if the mobile phone terminal correctly replies to the encrypted text message by sending to the Intermediary electronic equipment an appropriate encrypted text message, authentication is successful; typically, SMS or MMS and asymmetric encryption are used for implementing this method.