Selective deployment of underreamers and stabilizers

A downhole tool for increasing a cross-sectional area of a wellbore, comprising:

• a first drilling assembly including:
• a first reaming tool adapted to selectively increase the cross-sectional area of the wellbore;
• a first ball seat adapted to receive a ball, wherein at least one of the first ball seat or the ball is adapted to deform to allow the ball to pass through the first ball seat when a predetermined pressure is applied thereto;
• a first piston coupled to the first ball seat, wherein the first ball seat and the first piston are adapted to stroke when the ball is received within the first ball seat;
• and
• a first indexing mechanism coupled to the first piston, wherein the first indexing mechanism actuates the first reaming tool between an active state and an inactive state after each stroke of the first piston;
• a second drilling assembly axially offset from the first drilling assembly along the downhole tool, the second drilling assembly including:
• a second reaming tool adapted to selectively increase the cross-sectional area of the wellbore;
• a second ball seat adapted to receive the ball, wherein at least one of the second ball seat or the ball is adapted to deform to allow the ball to pass through the second ball seat when a predetermined pressure is applied thereto;
• a second piston coupled to the second ball seat, wherein the second ball seat and the second piston are adapted to stroke when the ball is received within the second ball seat;
• and
• a second indexing mechanism coupled to the second piston, wherein the second indexing mechanism actuates the second reaming tool between an active state and an inactive state after two strokes of the second piston.

A method for increasing a cross-sectional area of a wellbore, comprising:

• running a downhole tool into the wellbore, wherein the downhole tool includes first and second drilling assemblies coupled thereto and axially offset from one another;
• receiving a first ball within a first ball seat of the first drilling assembly, wherein at least one of the first ball seat or the first ball is adapted to deform when a predetermined pressure is reached to allow the first ball to pass through the first ball seat;
• moving the first ball seat and a first piston coupled thereto in response to the first ball being received in the first ball seat, thereby actuating a first reaming tool of the first drilling assembly between an active state and an inactive state, wherein the first reaming tool increases a cross-sectional area of the wellbore in the active state, and wherein the first piston is coupled to a first indexing mechanism adapted to repeatedly actuate the first reaming tool between active and inactive states in response to movement of the first ball seat and the first piston, the first indexing mechanism actuating the first reaming tool by using two strokes of the first piston;
• receiving a second ball within a second ball seat of the second drilling assembly, wherein at least one of the second ball seat or the second ball is adapted to deform when the predetermined pressure is reached to allow the second ball to pass through the second ball seat;
• and
• moving the second ball seat and a second piston coupled thereto in response to the second ball being received in the second ball seat, thereby actuating a second reaming tool of the second drilling assembly between the active state and the inactive state, wherein the second reaming tool increases the cross-sectional area of the wellbore in the active state, and wherein the second piston is coupled to a second indexing mechanism adapted to repeatedly actuate the second reaming tool between active and inactive states in response to movement of the second ball seat and the second piston, the second indexing mechanism actuating the second reaming tool by using one stroke of the second piston.