Wellbore Heating for Reservoir Condensation Control
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Solution Overview
Problem
Natural gas recovery from subterranean hydrocarbon reservoirs is hindered by liquid condensation, which reduces reservoir deliverability and results in low recovery factors, as existing methods are either reactive, costly, or inefficient in preventing condensate accumulation.
Innovation Solution
A method utilizing renewable energy sources to provide heat through a heat conducting element placed in the wellbore, maintaining temperatures above the dew point to prevent liquid condensation, thereby enhancing gas recovery by ensuring the subterranean hydrocarbon reservoir remains above the cricondentherm temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heating methods are used to prevent liquid condensation, then gas reservoir deliverability is improved, but operational costs increase and environmental impact worsens
Solution Approach 1:
The system utilizes the reservoir's own produced gas as the heating medium, eliminating the need for external energy sources. The gas circulates through the heating coil, absorbing heat from the coil and transferring it to the surrounding formation, thereby preventing condensate accumulation while using no additional energy input
Solution Approach 2:
A heating coil acts as an intermediary element that transfers thermal energy from the circulated gas to the surrounding formation. The coil facilitates heat exchange between the working fluid and the reservoir rock, enabling temperature control without direct contact between the heating medium and formation
2Object-affected harmful factors
If wellbore heating is applied to maintain temperature above dew point, then liquid condensation is prevented, but device complexity increases
Solution Approach 1:
The circulated gas serves multiple functions simultaneously: it acts as the heating medium, the production fluid, and the circulation driver. This multi-functionality eliminates the need for separate heating systems, pumps, and control mechanisms, thereby reducing device complexity while effectively preventing liquid condensation
3Productivity
If chemical solvents are injected to enhance gas relative permeability, then productivity is improved, but loss of substance increases and environmental harm worsens
Solution Approach 1:
The system converts the potentially harmful effect of pressure drawdown-induced condensation into a beneficial heating mechanism. By circulating the produced gas through a heating coil, the pressure drop that would normally cause condensate accumulation is transformed into the driving force for heat transfer, eliminating the need for chemical solvents while improving gas relative permeability
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 effectively prevents liquid condensation, improves gas reservoir deliverability, and increases the overall natural gas recovery efficiency by maintaining the reservoir above the dew point, thus addressing the limitations of existing methods.
Implementation Method 1
a heat conducting element, which is electrically coupled with the renewable energy source, is positioned in a perforated section within a wellbore that traverses into a subterranean hydrocarbon reservoir
Implementation Method 2
The renewable energy source can be, but is not limited to, solar energy and wind energy
Implementation Method 3
maintaining temperatures above the dew point to prevent liquid condensation, thereby enhancing gas recovery by ensuring the subterranean hydrocarbon reservoir remains above the cricondentherm temperature
Data Source
AI summary
A method of improving natural gas recovery from a subterranean hydrocarbon reservoir includes at least one renewable energy source that is electrically coupled with a heat conducting element. The heat conducting element is positioned in a perforated section of a wellbore that traverses into the subterranean hydrocarbon reservoir. A temperature of the subterranean hydrocarbon reservoir is maintained above a cricondentherm temperature so that liquid condensation may be prevented at a final production time. In order to maintain the temperature within a required temperature range, an internal temperature, an internal pressure, and a set of reservoir properties are monitored and then utilized to plot a phase diagram that can be used to detect liquid condensation. If liquid condensation is detected, an electrical output of the renewable energy source is adjusted in order to control the temperature of the subterranean hydrocarbon reservoir at a producing end of a production tubing.