Patent ID: 8419387

Claim:
A seal section for use in a downhole submersible pumping system, the seal section comprising: a clean fluid circulation system; a contaminated fluid circulation system; and at least one bag seal assembly, wherein the bag seal assembly comprises: an upper mounting block, wherein the upper mounting block comprises: a base; and a neck extending from the base; a lower mounting block; a bag seal extending over the upper mounting block and lower mounting block, wherein an interior of the bag seal provides a path for the clean fluid circulation system; a breather tube that extends between the upper and lower mounting blocks and forms part of the contaminated fluid circulation system; and a mounting plate connected to the upper mounting block, wherein the mounting plate limits an axial travel of the bag seal on the upper mounting block, and wherein the mounting plate comprises: a central opening sized and configured to permit installation of the mounting plate over the neck of the upper mounting block; an interior shoulder sized and configured to rest on top of and around an outer diameter of the base of the upper mounting block; and a breather tube port, wherein the breather tube port is configured for threaded engagement with the breather tube.