Downhole friction reduction systems having a flexible agitator

An agitator deployable in a wellbore, comprising:

• a housing comprising a central axis and a central passage;
• a valve disposed in the housing and comprising a first valve body having a first contact face and a second valve body permitted to rotate relative to the first valve body and having a second contact face configured to contact the first contact face;
• a first valve adapter coupled to the housing and which comprises a first receptacle which receives at least a portion of the first valve body to couple the first valve adapter to the first valve body;
• and
• a flexible valve seat positioned in the first receptacle of the first valve adapter between the first valve body and the first valve adapter and wherein the flexible valve seat is formed from a material having a durometer rating on the Shore A Hardness scale between 40 and 120 whereby the flexible valve seat is configured to permit the first valve body to flex relative to the first valve adapter such that an angular misalignment forms between a central axis of the first valve body and a central axis of the first valve adapter.

An agitator deployable in a wellbore, comprising:

• a housing comprising a central axis and a central passage;
• a valve disposed in the housing and comprising a first valve body having a first contact face and a second valve body permitted to rotate relative to the first valve body and having a second contact face configured to contact the first contact face;
• a first valve adapter coupled to the housing and which comprises a first receptacle which receives at least a portion of the first valve body to couple the first valve adapter to the first valve body;
• and
• a flexible valve seat positioned in the first receptacle of the first valve adapter and which seals the connection formed between the first valve body and the first valve adapter, and wherein the flexible valve seat is configured to permit the first valve body to flex relative to the first valve adapter whereby an angular misalignment forms between a central axis of the first valve body and a central axis of the first valve adapter.