Tortuous Flow Path Design for Geothermal Thermal Breakthrough Control

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Solution Overview

Problem

Geothermal energy production is hindered by thermal breakthrough and short-circuiting, leading to premature decline in production temperature and inefficiencies in heat recovery.

Innovation Solution

The use of cased and cemented geothermal completion designs, combined with multistage, multicluster hydraulic fracture treatments and proppant use, to create a substantially uniform tortuous flow path between injection and production wells, thereby reducing thermal breakthrough and enhancing resource recovery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional open-hole or slotted-liner completion designs are used, then fluid flow into the well is improved, but thermal breakthrough and short-circuiting occur prematurely

Engineering Contradiction:

Improvefluid flow rateVSAvoidthermal breakthrough timing

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses cased and cemented well completions with perforations instead of open-hole designs. The casing and cement act as controlled barriers that can be selectively opened through perforations, providing both structural integrity and controlled fluid flow paths that prevent thermal short-circuiting while maintaining productivity

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent introduces an intermediary tortuous flow path between injection and production wells. This indirect path forces thermal fronts to travel through the formation rather than taking direct shortcuts, allowing heat transfer while preventing premature thermal breakthrough

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If direct fluid circulation paths are created between injection and production wells, then heat recovery efficiency is improved, but thermal short-circuiting through high permeability zones occurs

Engineering Contradiction:

Improveheat recovery efficiencyVSAvoidthermal energy loss through short-circuiting

Core Design Contradiction:

Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The patent creates tortuous (curved/indirect) flow paths instead of straight lines. The fluid is forced to follow a curved, winding route through the formation, increasing the thermal contact length and preventing direct shortcuts through high-permeability zones, thereby improving heat recovery while reducing thermal energy loss

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Area of stationary object

If well spacing is reduced to increase system density, then land use efficiency is improved, but thermal breakthrough occurs more quickly

Engineering Contradiction:

Improveland use efficiencyVSAvoidtime to thermal breakthrough

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The patent uses tortuous flow paths as intermediaries that extend the thermal travel distance between wells. This allows closer well spacing to be implemented without proportionally reducing the time to thermal breakthrough, as the indirect path length compensates for the reduced well-to-well distance

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach achieves a more uniform temperature front and extended thermal energy recovery, reducing greenhouse gas emissions and improving the long-term sustainability of geothermal energy systems.

Implementation Method 1

hydraulically fracturing the formation by pumping a fracturing fluid under pressures in excess of the fracture pressure of the formation

Methodology Applied

Scientific EffectHydraulic fracturing: Fracture Mechanics

Implementation Method 2

pumping a fracturing fluid under pressures in excess of the fracture pressure of the formation through a plurality of perforations

Methodology Applied

Scientific EffectPressure-driven flow: Pressure Gradient

Implementation Method 3

flowing the injected heat recovery fluid out of perforations in an injector well and into a pay zone of a geothermal resource containing formation; wherein the fluid is heated by the formation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 4

flowing the heated working fluid into a production well and to the surface of the earth

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS12281550B2Methods and systems to control flow and heat transfer between subsurface wellbores connected hydraulically by fractures

Publication Date: 2025.04.22 FERVO ENERGY CO

AI summary

A controlled rate of propagation of the fluid saturation front or thermal front is desired in may oil and gas and geothermal operations. Natural fractures and fractures created during hydraulic stimulation may have heterogeneous hydraulic properties resulting in uneven flow distributions, therefore leading to short-circuiting and breakthrough issues. The present invention relates to wellbores connected hydraulically by multiple fracture zones; methods are directed to control for even flow distribution among fractures, regardless of heterogeneities in fracture hydraulic properties, and to control propagation of saturation fronts and thermal fronts in subsurface reservoirs.