Experimental and Numerical Simulation Investigation of Cement Sheath Integrity during Multi-Stage Fracturing in Offshore Tight Oil Reservoir
Abstract
:1. Introduction
2. Physical Experiments
2.1. Mechanical and Permeability Testing of Cement
2.2. Experiment on the Cement Sheath Integrity
2.2.1. Experimental System
2.2.2. Experimental Procedure
3. Numerical Simulation
3.1. Finite Element Model
3.2. Boundary Conditions and Simulation Steps
3.3. Mesh Sensitive Analysis
3.4. Model Validation
4. Results and Discussion
4.1. Experimental Results
4.1.1. TCT, TCLT, and Permeability Test Results
4.1.2. Stress–Strain Evolution in Cement under Cyclic Loading
4.1.3. Cement Sheath Integrity Experiment Results
4.2. Numerical Simulation Results
4.2.1. Equivalent Plastic Strain Evolution in Cement Sheaths
4.2.2. Micro-Annulus Evolution at Interfaces
4.3. Correlation between Numerical Simulation and Experimental Results
4.4. Sensitivity Analysis
4.5. Suggestions for Future Work
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Casing | Grade | Diameter (mm) | Thickness (mm) |
---|---|---|---|
Surface casing | P110 | 177.8 | 9.19 |
Intermediate casing | P110 | 244.5 | 9.65 |
Conductor casing | N80 | 339.7 | 11.99 |
Name | Elastic Modulus (GPa) | Poisson’s Ratio | Friction Angle (°) | Cohesive Strength (MPa) |
---|---|---|---|---|
Cement | 12 | 0.23 | 25 | 9 |
Formation | 23 | 0.18 | 30 | 6.2 |
Casing | 210 | 0.28 |
Name | Normal Stiffness (GPa) | Shear Stiffness (GPa) | Normal Cohesive Strength (MPa) | Shear Cohesive Strength (MPa) | Critical Energy (J/m2) |
---|---|---|---|---|---|
The 1st, 2nd, and 3rd interface | 0.8 | 2.2 | 1.2 | 2.3 | 100 |
The 4th interface | 1.5 | 4.5 | 2.6 | 5.6 | 210 |
Configuration | Mesh Size of the Wellbore (mm) | Total Number of Meshes | Micro-Annuli Width (um) |
---|---|---|---|
Coarse | 8 | 16,371 | 130.33 |
Medium | 4 | 49,152 | 130.12 |
Fine | 2 | 114,600 | 130 |
Type | Triaxial Compressive Strength (MPa) | Elastic Modulus (GPa) | Permeability (mD) |
---|---|---|---|
Before TCLT | 55 | 7.2 | 0.022 |
After TCLT | 49.1 | 6.6 | 0.053 |
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Wang, Y.; Feng, Y. Experimental and Numerical Simulation Investigation of Cement Sheath Integrity during Multi-Stage Fracturing in Offshore Tight Oil Reservoir. J. Mar. Sci. Eng. 2024, 12, 814. https://doi.org/10.3390/jmse12050814
Wang Y, Feng Y. Experimental and Numerical Simulation Investigation of Cement Sheath Integrity during Multi-Stage Fracturing in Offshore Tight Oil Reservoir. Journal of Marine Science and Engineering. 2024; 12(5):814. https://doi.org/10.3390/jmse12050814
Chicago/Turabian StyleWang, Yangang, and Yongcun Feng. 2024. "Experimental and Numerical Simulation Investigation of Cement Sheath Integrity during Multi-Stage Fracturing in Offshore Tight Oil Reservoir" Journal of Marine Science and Engineering 12, no. 5: 814. https://doi.org/10.3390/jmse12050814