Patent ID: 9062526
Filing Date: 2015-06-23
Classification: E21B

Abstract:
1. An automatic modular maintenance device that is configured to operate in an annulus of a well for the production of hydrocarbons comprising: at least one upper head module configured to be clamped to a service station positioned on a production tubing or on a well casing; at least one service element substitution module including a vertical housing with a space for containing a first sensor, a space for receiving a second sensor to be substituted and a space for allowing a passage of the first sensor and the second sensor to be substituted outwards; at least one foam module including a set of elements comprised of rigid floating foam bodies that are resistant to well bottom pressure, the rigid floating foam bodies being interconnected with each other by respective connection supports; at least one controlled thrust module including a first space occupied by compressible gas and a second space suitable for receiving completion fluid, the first space being separated from the second space by a moving sealing septum; at least one control module including command electronics; at least one battery module including one or more pressure resistant containers for batteries to supply power; at least one ballast module including a ballast, a containment volume of the ballast and one or more openings for rapid release of the ballast; and a terminal component substitution or maintenance module which includes one or more spaces to contain components to be substituted in the well or equipment necessary for maintenance operations on components already installed, wherein the automatic modular maintenance device is configured to operate in a portion of the annulus excluding the production tubing in the well, wherein the modules have a substantially cylindrical portion and are connected to each other by respective articulated joints, and wherein the automatic modular maintenance device is configured to float in completion fluid present in the annulus of the well.