Downhole tool and method

A down hole tool for detecting down hole conditions in a wellbore in a hydrocarbon reservoir, said down hole tool comprising:

• (a) an autonomous unit comprising a locomotion unit for providing a motion along the wellbore, said autonomous unit being adapted for operation in the wellbore untethered from the surface;
• (b) detecting units for detecting said down hole conditions;
• and
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters.

A down hole tool for detecting down hole conditions in a wellbore in a hydrocarbon reservoir, said down hole tool comprising:

• (a) an autonomous unit having a locomotion unit for providing a notion along the wellbore;
• (b) detecting units for detecting said down hole conditions;
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters;
• and
• (d) a wireline unit connected to the surface and a connection system for providing a separable and re-connectable connection between said wireline unit and said autonomous unit, wherein said connection system includes a motor unit for closing and/or breaking the connection.

An autonomous downhole oilfield tool comprising;

• a) a body adapted to be delivered into a wellbore from the surface and be resident in the wellbore, the body being adapted to operate untethered from the surface;
• b) a source of electrical power operatively associated with the body;
• c) at least one sensor associated with the body monitoring at least one operating parameter of the tool relative to its environment;
• d) a microprocessor associated with the body receiving data from the sensor;
• e) memory associated with the microprocessor providing information for operating instructions to the body;
• f) transport mechanism controlled by the microprocessor and moving the body within the wellbore;
• and
• g) an end work device associated with the body performing a desired function downhole.

A downhole work system comprising:

• a delivery system delivering an autonomous downhole oilfield tool to a predetermined location downhole and releasing the downhole tool at said predetermined location, the downhole comprising:
• a) a body adapted to be delivered into a wellbore from the surface and be resident in the wellbore;
• b) a source of electrical power operatively associated with the body;
• c) at least one sensor associated with the body monitoring at least one operating parameter of the tool relative to its environment;
• d) a microprocessor associated with the body receiving data from the sensor;
• e) memory associated with the microprocessor providing information for operating instructions to the body;
• f) transport mechanism controlled by the microprocessor and moving the body within the wellbore;
• and
• g) an end work device associated with the body performing a desired function downhole.

A wellbore monitoring control and work system comprising:

• (a) a wellbore
• (b) a body adapted to be delivered into a wellbore from the surface and be resident in the wellbore;
• (c) a source of electrical power operatively associated with the body;
• (d) at least one sensor associated with the body monitoring at least one operating parameter of the tool relative to its environment;
• (e) a microprocessor associated with the body receiving data from the sensor;
• (f) memory associated with the microprocessor providing information for operating instructions to the body;
• (g) transport mechanism controlled by the microprocessor and moving the body within the wellbore;
• (h) an end work device associated with the body performing a desired function down hole;
• (i) a wireline unit located in the wellbore at a predetermined location, said wireline unit cooperating with said body to provide electrical power and data to the body, and said body being adapted to operate untethered from said wireline unit.

A down hole tool for detecting down hole conditions in a wellbore in a hydrocarbon reservoir, said tool comprising;

• (a) an autonomous unit having an outer hull and a locomotion unit for providing motion along the wellbore, said autonomous unit being designed such that, during motion, an essentially annular region is left between said outer hull of said autonomous unit and the wall of the wellbore;
• (b) detecting units for detecting the down hole conditions;
• and
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters, the tool being adapted to operate in the wellbore untethered from the surface.

A down hole tool for detecting downhole conditions in a wellbore in a hydrocarbon reservoir, said downhole tool comprising:

• (a) an autonomous unit having a locomotion unit for providing motion along the wellbore;
• (b) detecting units for detecting the down hole conditions;
• and
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters,
• (d) wherein the buoyancy of said autonomous unit is controlled by a releasable ballast unit.

A downhole tool for detecting down hole conditions in a wellbore in a hydrocarbon reservoir, said downhole tool comprising:

• (a) an autonomous unit having a locomotion unit for providing motion along the wellbore, said autonomous unit comprising a foldable parachute for supporting a motion in a direction of a flow in the wellbore;
• (b) detecting units for detecting the down hole conditions;
• and
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters, and said tool being adapted to operate in the wellbore untethered from the surface.

A down hole tool for detecting down hole conditions in a wellbore in a hydrocarbon reservoir, said downhole tool comprising:

• (a) an autonomous unit having a locomotion unit for providing motion along the wellbore, said autonomous unit comprising a foldable parachute for supporting a motion in a direction of a flow in the wellbore;
• (b) detecting units for detecting the down hole conditions;
• and
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters, and said tool being adapted to operate in the wellbore untethered from the surface.

A down hole tool for detecting down hole conditions in a wellbore in a hydrocarbon reservoir, said down hole tool comprising:

• (a) an autonomous unit:
• (i) having a locomotion unit for providing motion along the wellbore and
• (ii) comprising a telemetry channel for communicating signals;
• (b) detecting units for detecting the down hole conditions;
• and
• (c) a logic unit for controlling said autonomous unit, said logic unit being capable of making decisions based on at least two input parameters, and said tool being adapted to operate in the wellbore untethered from the surface.