Downhole Methane Hydrate Flow Analysis for Production Prediction
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Solution Overview
Problem
Existing techniques struggle to accurately determine the properties of methane hydrate reservoirs due to phase changes from solid to gas and liquid phases during sampling, leading to inaccurate assessments of economic value and production potential.
Innovation Solution
Measure flow properties of formation fluids using downhole tools to determine the dissociation constant of methane hydrate, generating a production output based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If core samples are retrieved and characterized above surface, then fluid properties can be measured, but chemical phase changes occur due to temperature and pressure differences
Solution Approach 1:
The patent performs measurements of flow properties (pressure, temperature, composition) directly downhole before the formation fluid undergoes phase changes during retrieval. By conducting the analysis in-situ at reservoir conditions, the system captures the fluid state before any phase transitions occur during sample retrieval to surface.
Solution Approach 2:
The downhole tool acts as an intermediary measurement platform that enables fluid characterization within the reservoir environment. The tool includes sensors and analyzers that measure flow properties directly in the formation, serving as a mediator between the formation fluid and surface analysis equipment.
2Measurement precision
If static petrophysical evaluation is used within the reservoir, then measurements can be obtained, but phase change from solid to gas and liquid cannot be detected
Solution Approach 1:
The patent transitions from static petrophysical evaluation to dynamic flow-based measurements. By measuring flow properties (pressure, temperature, composition) during actual fluid flow through the wellbore, the system can detect phase changes as they occur dynamically, rather than relying on static reservoir conditions.
Solution Approach 2:
The system specifically monitors for phase transitions of methane hydrate by measuring flow properties during fluid flow. The downhole tool detects when hydrate dissociates into gas and liquid phases by observing changes in pressure, temperature, and fluid composition during the flow process.
3Reliability
If downhole tools measure flow properties, then dynamic assessment of methane hydrate can be achieved, but system complexity increases
Solution Approach 1:
The downhole tool is designed as a multi-functional platform that performs multiple measurements (pressure, temperature, fluid composition) using integrated sensors and analyzers. This universal tool replaces multiple separate measurement systems, reducing overall system complexity while enabling comprehensive flow property characterization.
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
Provides accurate and dynamic assessments of methane hydrate properties, enabling informed decisions on drilling and reservoir stability.
Implementation Method 1
the methane hydrate will experience a phase change from solid to gas and liquid (e.g., water) when a pressure of the fluid flowing from the geological formation is below a hydrate equilibrium pressure
Data Source
AI summary
This disclosure relates to techniques for determining a dissociation constant of a reservoir that includes methane hydrate and generating a methane hydrate production output that may be used to inform certain decisions related to processing a reservoir that includes the methane hydrate. In some embodiments, the techniques may include determining the dissociation constant using multiple pressures measured at different flowrates at time points from within a wellbore.