Suction device for drilling mud

A survey system for subsoil drilling rigs, comprising:

• a suction device for drilling muds, comprising:
• a main body, having at least one internally hollow cylindrical body;
• a rotary actuator connected to said main body;
• a rotation shaft extending within said internally hollow cylindrical body, said rotation shaft being operably connected to said rotary actuator and having an end portion axially protruding from said cylindrical body;
• a rotatable terminal element mounted on the end portion of said rotation shaft and having a plurality of connected, axially spaced coaxial rings defining a plurality of circumferential openings placing an interior of said rotatable terminal element in fluidic communication with the environment external of the rotatable terminal element interior;
• and
• a fixed cleaning device, arranged externally of the rotatable terminal element, comprising:
• a plurality of protrusions substantially integral with said cylindrical body, each protrusion extending into a respective one of said circumferential openings, thus clearing said circumferential openings during a rotation of said rotatable terminal element;
• a degassing device for receiving drilling fluid from the suction device and separating said drilling fluid into a gaseous component and a substantially liquid part;
• and
• one or more analysis devices configured to receive said gaseous component and execute analyses on said gaseous component.

A subsoil drilling rig, comprising:

• a support structure;
• a motorized member;
• a drill bit, rotatably activated by said motorized member in order to drill a well;
• a structure of pipes connecting said motorized member to said drill bit;
• a feeding structure for causing a drilling fluid to flow into said well through said pipes;
• a return duct in which said drilling fluid flows as it returns from said well;
• a survey system for subsoil drilling rigs, comprising:
• a suction device for drilling muds, comprising:
• a main body, having at least one internally hollow cylindrical body;
• a rotary actuator connected to said main body;
• a rotation shaft extending within said internally hollow cylindrical body, said rotation shaft being operably connected to said rotary actuator and having an end portion axially protruding from said cylindrical body;
• a rotatable terminal element mounted on the end portion of said rotation shaft and having a plurality of connected, axially spaced coaxial rings defining a plurality of circumferential openings placing an interior of said rotatable terminal element in fluidic communication with the environment external of the rotatable terminal element interior;
• and
• a fixed cleaning device, arranged externally of the rotatable terminal element, comprising:
• a plurality of protrusions substantially integral with said cylindrical body, each protrusion extending into a respective one of said circumferential openings, thus clearing said circumferential openings during a rotation of said rotatable terminal element;
• a degassing device for receiving drilling fluid from the suction device and separating said drilling fluid into a gaseous component and a substantially liquid part;
• and
• one or more analysis devices configured to receive said gaseous component and execute analyses on said gaseous component;
• wherein said rotatable terminal element is immersed in said drilling fluid returning from said well.