Pressurized Core Transfer Tool for Reservoir-Condition Testing
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Solution Overview
Problem
Conventional tools for transferring subterranean reservoir core samples from high pressure to atmospheric pressure cause changes in fluid composition and structure, making laboratory data non-representative of downhole conditions, and are incompatible with certain laboratory measurements like NMR.
Innovation Solution
A system for transferring core samples from a pressurized coring tool to a pressurized core holder that maintains initial pressure, allowing for tests like NMR and CT scans, using a tool system composed of components that can be made from a single piece or multiple pieces mechanically coupled, with features like coupling, fastening, and securing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tools are used to transfer core samples from high pressure to atmospheric pressure, then the transfer process is simple and straightforward, but the fluid composition changes and structural alterations occur making laboratory data non-representative
Solution Approach 1:
A pressurized transfer tool acts as an intermediary device between the core barrel and laboratory equipment, maintaining pressure during sample transfer. This mediator prevents direct pressure changes that would alter fluid composition and rock structure, thereby preserving sample integrity while enabling accurate laboratory measurements.
Solution Approach 2:
The patent replaces the conventional mechanical depressurization system with a pressurized transfer system that uses fluid pressure control mechanisms. Instead of allowing natural pressure equalization that causes sample degradation, the system actively maintains reservoir pressure throughout the transfer process using pumped fluid and pressure-regulated components.
2Measurement precision
If conventional metal tools are used for core sample transfer, then the tools are structurally strong and durable, but they are incompatible with NMR measurements due to magnetic shielding
Solution Approach 1:
The transfer tool employs composite material construction, combining non-magnetic materials (such as titanium or fiber-reinforced polymers) with structural design elements that provide necessary strength. This composite approach eliminates magnetic interference for NMR compatibility while maintaining the mechanical strength required for withstanding reservoir pressures and handling core samples.
Solution Approach 2:
The patent changes the material parameter of the transfer tool from ferromagnetic metal to non-magnetic materials. This parameter change in magnetic permeability eliminates the shielding effect that would interfere with NMR measurements, while the material selection and structural design maintain sufficient mechanical strength for the application.
3Ease of operation
If core samples are depressurized to atmospheric pressure for laboratory study, then the samples can be easily handled and analyzed, but the fluid composition and physical structure are altered
Solution Approach 1:
The pressurized transfer tool serves as an intermediary system that enables sample handling while maintaining stable composition. By providing a pressurized environment throughout the transfer and initial handling process, the mediator prevents pressure-induced changes in fluid composition and rock structure, allowing accurate analysis without premature depressurization.
Solution Approach 2:
The system creates a controlled, inert pressurized environment that protects the core sample from environmental changes during transfer. This controlled atmosphere maintains constant pressure conditions, preventing unwanted chemical reactions, phase changes, or structural alterations that would occur during uncontrolled depressurization to atmospheric pressure.
Data Source
AI summary
A method for performing a test on a core sample can include transferring at least a portion of a core sample from a first vessel to a second vessel, where the core sample is maintained at a first pressure that is at least a substantially equivalent pressure while transferring the core sample from the first vessel to the second vessel. The method can also include performing a test on the core sample in the second vessel at the first pressure, and reducing the pressure on the core sample in the second vessel. The method can further include repeating the test on the core sample in the second vessel at a second pressure that is lower than the first pressure. The method can also include creating a model of hydrocarbon production as a function of pressure for a subterranean reservoir from which the core sample was retrieved for hydrocarbon production.