The restricted annular is a unique redundancy dual ESP solution that overcomes casing size restriction. This innovative RMSpumptools patented system allows a dual ESP system of 562 Series Pumps inside 7” casing or 675 Series Pumps inside 9-5/8” casing.
A second (inverted) ESP is suspended from the bottom of a standard ESP system - each system has its own power cable. The lower (inverted) ESP is filled with a stinger intake that engages into a sump packer PBR.
An ADV (automatic diverter valve) is situated both above the upper ESP and below the lower ESP, to provide automatic flow bypass to enable each ESP to operate independently.
This system is for use in wells where the ideal ESP series (OD size) does not allow room for a dual system using Y-Tool bypass or encapsulated (CAN) system. It is the simplest ESP system possible, allowing the operator to maximise drawdown, whilst retaining the benefits of a down-hole backup dual ESP system.
Typical Restricted Annular UVP Completion