Abstract
This defensive publication discloses the use of a downhole electric submersible pump (ESP) placed at the distal end of a non‑metallic tubular within a coaxial downbore heat exchanger such that the tubular experiences internal (positive) pressure rather than external collapse pressure during operation. The approach addresses the limited collapse resistance of a non‑consolidated, non‑metallic inner tube (e.g., reinforced thermoplastic pipe, RTP, or Thermoplastic Composite Pipe, TCP) that would otherwise see a collapse scenario when driven by a surface pump. By suspending and operating the ESP at the bottom of the inner tubular, the system changes the operating condition from collapse to internal pressure, enabling the non‑metallic tubular to function as part of the downhole heat exchanger without exceeding its collapse limits.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
"Use of an Electric Submersible Pump (ESP) for a Downbore Heat Exchanger Containing a Non-Metallic Tubular", Technical Disclosure Commons, (March 23, 2026)
https://www.tdcommons.org/dpubs_series/9582