CO2 Storage Capacity Calculation Method for Reservoir Drying
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Solution Overview
Problem
Current methods for CO2 geological sequestration lack accurate evaluation of the impact of formation water evaporation and salt deposition on CO2 storage capacity, necessitating a comprehensive method to assess and adjust storage capacity parameters effectively.
Innovation Solution
A method and device for calculating the change in CO2 storage capacity before and after reservoir drying, involving the acquisition of formation water and CO2 samples, displacement experiments, and calculation of porosity changes to determine the drying radius and CO2 storage capacity, using a novel displacement device with specific components and formulas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If formation water evaporates during CO2 injection, then CO2 storage capacity increases, but salt deposition reduces CO2 storage capacity
Solution Approach 1:
The patent performs preliminary displacement experiments to measure core porosity under irreducible water saturation conditions before conducting the main CO2 storage capacity evaluation. This preliminary characterization of the reservoir core properties enables accurate prediction of how formation water evaporation and salt deposition will affect CO2 storage capacity, allowing for advance planning and parameter adjustment in the sequestration scheme
Solution Approach 2:
The patent systematically changes key parameters including formation water content, CO2 injection pressure, temperature, and core porosity to evaluate their combined effects on CO2 storage capacity. By measuring porosity changes under different water saturation conditions and calculating the drying radius, the method quantifies the competing effects of water evaporation (which increases storage capacity) and salt deposition (which reduces storage capacity), enabling optimized injection parameters
2Measurement precision
If comprehensive evaluation of formation water evaporation and salt deposition is performed, then CO2 storage capacity calculation accuracy improves, but measurement and calculation complexity increases
Solution Approach 1:
The patent divides the complex evaluation process into distinct experimental segments: (1) core preparation and saturation with formation water, (2) displacement experiments to measure porosity at irreducible water saturation, (3) drying experiments to measure porosity after complete evaporation, and (4) calculations to determine drying radius and CO2 storage capacity. This segmentation allows each measurement to be performed with focused precision while using standardized procedures that reduce overall complexity
Solution Approach 2:
The patent uses core porosity as an intermediary parameter to link formation water evaporation and salt deposition effects to CO2 storage capacity changes. By measuring porosity under controlled conditions (with and without formation water) and using it in the storage capacity calculation formula, the method translates complex multi-factor interactions into a manageable calculation framework that maintains high accuracy without excessive complexity
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 more accurate parameters for CO2 sequestration by accounting for the effects of formation water evaporation and salt deposition, enhancing the efficiency of CO2 storage and allowing for timely adjustments in storage schemes.
Implementation Method 1
perform a displacement experiment under the target formation condition using the gaseous CO2 sample until the water saturation of the target stratum core reaches the saturation of irreducible water in the actual stratum
Implementation Method 2
keep the displacement experiment using the gaseous CO2 sample until all the formation water in the target stratum core has evaporated
Implementation Method 3
mix the formation water sample and the gaseous CO2 sample under the target formation condition and measure the content of the saturated condensate water in the gaseous CO2 sample
Data Source
AI summary
The present disclosure presents a device and method for calculating a change in CO2 storage capacity before and after drying, wherein the method comprises the following steps: S1: acquire a target stratum core and prepare a formation water sample and a gaseous CO2 sample; S2: measure the content of the saturated condensate water of the gaseous CO2 sample under a target formation condition; S3: saturate formation water for the target stratum core; S4: perform displacement experiments until a water saturation of a core at the target stratum reaches saturation of irreducible water in an actual stratum, and record a core porosity ϕ0 at this time; S5: continue the displacement experiment until all the formation water in the core of the target stratum has evaporated, and record the core porosity ϕ1 at this time; S6: calculate a drying radius of reservoir and the change of CO2 storage capacity after reservoir drying.