Hydrostatic Rock Compression Chamber for Downhole Stress Simulation
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Solution Overview
Problem
Existing techniques for determining rock properties in oilfield operations are not effective for various types of rocks, necessitating a more reliable method to optimize petroleum production.
Innovation Solution
A hydrostatic rock compression chamber system is used to test formation samples by simulating downhole conditions, applying pressure, and analyzing the rock's elastic and plastic recovery using X-ray CT scans to determine its properties under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing techniques are used to determine rock properties, then the process is simpler, but the effectiveness is insufficient for many types of rocks
Solution Approach 1:
The testing system is divided into distinct functional modules: a hydrostatic compression chamber for applying controlled pressure, an X-ray CT scanner for imaging, and a data processing system. This segmentation allows each component to be optimized independently while maintaining overall system reliability for determining rock properties across different rock types.
Solution Approach 2:
A hydrostatic fluid acts as an intermediary medium to transmit pressure uniformly to the rock sample from all directions. This intermediary enables accurate simulation of downhole stress conditions without direct mechanical contact that could introduce measurement errors or damage the sample, thereby improving reliability for diverse rock types.
2Measurement precision
If downhole conditions are simulated accurately, then rock property accuracy improves, but the testing time increases
Solution Approach 1:
The rock sample is first scanned using X-ray CT to obtain its three-dimensional internal structure and density distribution before applying hydrostatic pressure. This preliminary action allows for pre-characterization of the sample, enabling faster subsequent analysis and reducing the time required to interpret results under stress conditions.
Solution Approach 2:
The system continuously monitors rock sample properties during hydrostatic compression by performing sequential X-ray CT scans at different pressure levels. This continuous measurement approach captures real-time elastic and plastic deformation behavior without interrupting the pressure application, thereby maintaining measurement precision while minimizing total testing time.
3Loss of information
If elastic and plastic recovery are measured under stress, then rock property detail increases, but the measurement complexity increases
Solution Approach 1:
The system uses X-ray CT imaging to continuously monitor changes in rock sample density and structure during hydrostatic compression. This feedback mechanism provides quantitative data on elastic and plastic recovery by comparing pre-compression and post-compression images, enabling detailed rock property analysis through automated image processing and density calculation algorithms.
Solution Approach 2:
Traditional mechanical strain gauges and extensometers are replaced with non-contact X-ray CT imaging to measure rock deformation. This substitution eliminates the need for complex mechanical measurement systems while providing more comprehensive three-dimensional data on elastic and plastic recovery, thereby reducing measurement system complexity while increasing information detail.
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 method provides detailed rock property analysis, enabling accurate simulation of downhole stress conditions and improving the optimization of oilfield operations by accurately determining rock properties and their stress dependencies.
Implementation Method 1
a hydrostatic rock compression chamber (sample holder) to inspect a rock sample from an underground formation
Implementation Method 2
The sample may be imaged using X-ray CT prior to compression to determine its interior solid and pore structure
Data Source
AI summary
The disclosed embodiments include a rock sample inspection method. The method may include preparing a sample of formation rock by encapsulating the sample, inserting the sample into a vessel body as part of a test assembly, enclosing the sample within an low compressibility fluid, applying pressure to an interior of the vessel body by tightening a compression screw employing a piston acting on said low compressibility fluid, monitoring the pressure, conducting a test on the sample, and recording results of the test for further analysis.