Expandable bullnose assembly for use with a wellbore deflector

A bullnose assembly, comprising:

• a body;
• a bullnose tip arranged at a distal end of the body, the bullnose tip being configured to move between a default configuration, where the bullnose tip exhibits a first diameter, and an actuated configuration, where the bullnose tip exhibits a second diameter that is different than the first diameter;
• a collet body forming at least part of the bullnose tip and defining a plurality of axially extending fingers;
• a radial protrusion defined on an inner surface of the collet body and extending radially inward from each axially extending finger;
• and
• a piston movably arranged within a piston chamber defined within the collet body and having a wedge member defined on an outer surface thereof, the piston being actuatable such that the wedge member engages the radial protrusion and forces the plurality of axially extending fingers radially outward, wherein the bullnose tip exhibits the second diameter with the plurality of axially extending fingers being forced radially outward.

A multilateral wellbore system, comprising:

• a main bore having a first junction and a second junction spaced downhole from the first junction;
• a first deflector arranged at the first junction and defining a first channel that exhibits a predetermined diameter and communicates with a first lower portion of the main bore, and a second channel that communicates with a first lateral bore;
• a second deflector arranged at the second junction and defining a third channel that exhibits the predetermined diameter and communicates with a second lower portion of the main bore, and a fourth channel that communicates with a second lateral bore;
• a bullnose assembly including a body and a bullnose tip arranged at a distal end of the body, the bullnose assembly being configured to move between a default configuration, where the bullnose tip exhibits a first diameter, and an actuated configuration, where the bullnose tip exhibits a second diameter that is different than the predetermined diameter;
• a collet body forming at least part of the bullnose tip and defining a plurality of axially extending fingers;
• a radial protrusion defined on an inner surface of the collet body and extending radially inward from each axially extending finger;
• and
• a piston movably arranged within a piston chamber defined within the collet body and having a wedge member defined on an outer surface thereof, the piston being actuatable such that the wedge member engages the radial protrusion and forces the plurality of axially extending fingers radially outward, wherein the diameter of the bullnose tip exceeds the predetermined diameter with the plurality of axially extending fingers being forced radially outward,
• wherein the first and second deflectors are configured to direct the bullnose assembly into one of the first and second lateral bores and the first and second lower portions of the main bore based on a diameter of the bullnose tip as compared to the predetermined diameter.