Methods and systems for acoustic drift run

A method of evaluating accessibility inside a wellbore, comprising:

• providing a system for evaluating accessibility inside the wellbore, comprising a transducer connected to a wave-generating unit and an analyzing unit, wherein;
• the transducer, the wave-generating unit, and the analyzing unit are disposed above the wellbore;
• the wave-generating unit is configured to emit at least one acoustic wave through the transducer into the wellbore;
• the at least one acoustic wave propagates downwards in the wellbore and produces at least one echo wave upon contacting a wellbore object at an object depth (DO);
• the at least one echo wave propagates upwards in the wellbore;
• and
• the analyzing unit is configured to receive the at least one echo wave through the transducer;
• propagating the at least one acoustic wave downwards in the wellbore;
• contacting the at least one acoustic wave with the wellbore object, and thereby producing the at least one echo wave propagating upwards in the wellbore;
• receiving the at least one echo wave;
• analyzing the at least one echo wave and thereby determining the object depth;
• and
• comparing the object depth (DO) with a target depth (DT), and thereby evaluating the accessibility inside the wellbore.