Deflector assembly and efficient method for multi-stage fracturing a multilateral well using the same

A method for forming a multilateral well, comprising:

• placing a deflector assembly proximate an intersection between a main wellbore and a lateral wellbore, the deflector assembly including;
• a deflector body having a deflector window located therein;
• a deflector ramp positioned at least partially across the deflector window;
• and
• an actuation member positioned within the deflector body, the actuation member including an inner sleeve configured to slide within the deflector body and engage with the deflector ramp proximate a downhole end thereof, the inner sleeve configured to move the deflector ramp between first, second and third different positions;
• running a downhole tool past the deflector assembly to the main wellbore, thereby triggering the actuation member to allow the deflector ramp to move from the first position toward the second position;
• withdrawing the downhole tool uphole of the deflector ramp without pulling the downhole tool out of the multilateral well, the actuation member allowing the deflector ramp to rest at the second position;
• pushing the downhole tool in contact with the deflector ramp resting at the second position and out into the lateral wellbore, thereby pushing the deflector ramp from the second position to the third position and triggering the actuation member to allow the deflector ramp to move from the third position toward the first position;
• and
• withdrawing the downhole tool uphole of the deflector ramp, thereby allowing the deflector ramp to return to the first position from the third position.

A multilateral well, comprising:

• a main wellbore;
• a lateral wellbore extending from the main wellbore;
• and
• a deflector assembly located proximate an intersection between the main wellbore and the lateral wellbore, the deflector assembly including;
• a deflector body having a deflector window located therein;
• and
• a deflector ramp positioned at least partially across the deflector window, the deflector ramp configured to be positioned at first, second and third different positions;
• and
• an actuation member positioned within the deflector body, the actuation member including an inner sleeve configured to slide within the deflector body downhole of the deflector ramp and engage with the deflector ramp proximate a downhole end thereof, the inner sleeve configured to hold the deflector ramp at the first and the second different positions when a downhole tool moves back and forth within the deflector body.