Seal section for a downhole pumping unit

摘要

A seal section for connecting a downhole motor and pump used to remove fluids from an oil well comprising a plurality of balance chambers which are vertically stacked and fluidly interconnected in a serial manner such that a fluid path between the well and the motor extends through a series of balance chambers. Each balance chamber is comprised of two concentric, open ended tubes disposed within a tubular casing member and the tubes of each balance chamber are mounted on different ones of seal heads which are spaced vertically along the seal section to delimit the ends of the balance chambers. Each seal head intermediate the seal heads disposed at upper and lower ends of the seal section is provided with one upperwardly extending tube and one downwardly extending tube such that any selected number of balance chambers can be formed by selecting the number of intermediate seal heads to be incorporated into the seal section.