Autonomous untethered well object having an axial through-hole

An apparatus usable with a well, comprising:

• a body comprising a longitudinal passageway extending through the body;
• a blocking member disposed in the passageway to check fluid from flowing in a predefined direction through the passageway;
• a sensor disposed on the body to sense a property of an environment of the string as the object is being communicated through the passageway;
• a radially expandable element disposed on the body;
• and
• a controller disposed on the body to selectively autonomously control the expandable element to land the body in a downhole restriction in response to the sensing.

An apparatus usable with a well, comprising:

• a string comprising a passageway;
• and
• an untethered object adapted to be deployed in the passageway such that the object travels in the passageway, the object comprising:
• a longitudinal passageway extending through the object;
• a degradable check valve element disposed in the longitudinal passageway, the degradable check valve element being adapted to degrade in a downhole well environment at a faster rate than other components of the untethered object;
• a sensor to sense a property of an environment of the string as the object is being communicated through the passageway of the string;
• and
• a radially expandable element;
• and
• a controller disposed on the body and coupled to the sensor to selectively autonomously control the expandable element to land the body in a seat of the string in response to the sensing.