Pressure Cell Reactor for In-Situ Calcite Scale Monitoring
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Solution Overview
Problem
Current studies on calcite precipitation, adhesion, and scaling in the oil and gas industry lack experimental approaches that accurately replicate conditions found in oil wells, particularly under high pressure and temperature, and fail to account for the presence of carbon dioxide, which affects chemical balance and crystal formation.
Innovation Solution
A laboratory-scale system comprising a pressure cell reactor that mimics oil well conditions by varying pressure up to 100 bar and temperature between 2° C. and 100° C., incorporating CO2 and N2 injection, and utilizing photomicroscopy for non-intrusive monitoring of crystal growth and agglomeration, coupled with core-holders to simulate completion elements and porous media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intrusive techniques are used to study calcite crystal dynamic behavior, then samples can be analyzed using laser beam diffraction or dynamic light scattering, but the actual content formed in reactions changes, affecting amount, morphology, type and eliminating effects of aqueous carbon gas
Solution Approach 1:
The patent replaces intrusive mechanical sampling and analysis techniques with non-intrusive optical monitoring (light scattering, absorption, and imaging techniques) that allow real-time observation of crystal formation and dynamic behavior without removing samples from the reaction environment, thus maintaining the integrity of the aqueous carbon gas effects
Solution Approach 2:
The patent introduces an optical intermediary system (light beams, cameras, and sensors) that mediates the observation of calcite crystal formation processes, enabling measurement of crystal amount, morphology, and dynamics without direct physical contact or removal of samples that would alter the reaction conditions
2Ease of operation
If CO2 is released from solution in the form of gas during sampling, then samples can be taken for analysis, but the effects of studies with aqueous carbon gas are eliminated
Solution Approach 1:
The patent replaces mechanical sampling operations that cause CO2 degassing with optical detection methods that monitor crystal formation in situ, eliminating the need to transfer samples and thereby preserving the aqueous carbon gas effects throughout the measurement process
3Ease of manufacture
If laboratory studies are conducted under ambient conditions, then experimental setup is simpler, but the conditions do not represent the saturation condition found in carbonate reservoirs
Solution Approach 1:
The patent changes the physical parameters of the experimental system by implementing pressure vessels and temperature control systems that maintain high pressure and elevated temperature conditions, replicating the saturation conditions of carbonate reservoirs and enabling realistic simulation of CO2 dissolution and calcite precipitation processes
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
Enables realistic laboratory-scale reproduction of calcite precipitation, adhesion, and scaling phenomena, supporting the development of computational models for better understanding and mitigation of carbonate scales, reducing well interventions and maintenance costs.
Implementation Method 1
varying pressure up to 100 bar
Implementation Method 2
temperature between 2° C. and 100° C.
Implementation Method 3
reproduction of calcite precipitation
Implementation Method 4
the presence of carbon dioxide at high pressures aims at representing the saturation condition (dissolved) found in carbonate reservoirs
Implementation Method 5
release it in the form of gas favoring the alteration of the chemical balance, according to the equation below, with the consequent precipitation of calcium carbonate, according to the Le-Chatelier principle
Implementation Method 6
monitoring the process in a non-intrusive way through photomicroscopy techniques
Implementation Method 7
includes the possibility of injecting CO2 and N2 to pressurize the system to values close to those observed in conditions found in many oil wells (100 bar (10 MPa))
Data Source
AI summary
The present invention addresses to a system that aims at reproducing situations close to those found in oil wells, in relation to the thermodynamic conditions (pressure and temperature), and the fluids present (by means of the chemical species involved), aiming at representing in a more realistic way the production scenarios to be faced. The main scope is to represent on a laboratory scale the phenomenon of depressurization with the release of carbon dioxide inducing the precipitation of calcite (calcium carbonate), the growth and agglomeration of inorganic crystals, and the phenomena of adhesion and scale on common metallic surfaces of elements of completion of oil wells.