Method and apparatus for completing a multi-stage well

A method comprising:

• deploying tubular string comprising seat assemblies in a well, each of the seat assemblies having an object catching state in which the seat assembly is adapted to allow an untethered object communicated through a passageway of the tubular string to pass through the seat assembly and a pass through state in which the seat assembly is adapted to catch the object;
• configuring all of the assemblies to be in the object catching state when the tubular string is initially deployed in the well;
• deploying the untethered object in the tubular string to cause the object to land in a seat of one of the assemblies to create a fluid barrier in the tubular string;
• diverting fluid using the fluid tight barrier to perform a stimulation operation in the well;
• running a shifting tool in the tubular string in the passageway of the tubular string to shift the seat assembly having the seat in which the object has landed to cause the shifted seat assembly to release the object to allow the object to travel through the tubular string to land in a seat of another one of the seat assemblies;
• and
• repeating the acts of using the fluid tight barrier and running the shifting tool.

A system usable with a well, comprising:

• a tubular string;
• and
• a plurality of seat assemblies disposed in the tubular string, each of the seat assemblies being adapted to be shifted by a shifting tool run inside a passageway of the tubular string to transition the seat assembly between a pass through state in which the seat assembly is adapted to allow an object communicated through a passageway of the tubular string to pass through the seat assembly and an object catching state in which the seat assembly is adapted to catch the object in a seat of the assembly to form a fluid barrier in the tubular string,
• wherein all of the assemblies are configured to be in the object catching state when the tubular string is initially deployed in the well.

An assembly usable with a well, comprising:

• a tubular housing adapted to form part of a tubular string installed in a well;
• a compressible element disposed in the housing having a compressed state in which the element is adapted to form a seat to catch an object communicated to the apparatus via the tubular string and an uncompressed state in which the element is adapted to allow the object to pass through the apparatus;
• and
• an operator comprising a profile adapted to be engaged by a shifting tool run inside the tubular string after the string is installed in the well to transition the compressible element between the compressed state and the uncompressed state.