Moderate Collapse in a Shale Cap of a Nearly Depleted Reservoir
Abstract
:1. Introduction
2. Conventional Wellbore Stability Analysis and Design in a Depleted Reservoir
3. Concept for Moderate Collapse and Quantitative Evaluation in the Shale Cap.
4. Discussion and New Design Idea
- Initial reservoir pressure: 36 MPa; Buried depth: 3600~3620 m.
- Elastic and strength parameters in the shale cap: Poisson’s ratio = 0.25; Biot’s coefficient = 0.8; cohesive strength = 5 MPa; internal friction angle = 30°.
- According to the Anderson fault classification, the stress state in different types of faults can be given as (1) normal fault (NF): = 65 MPa, = 55 MPa, = 76 MPa; (2) reverse fault (RF): = 76 MPa, = 65 MPa, = 55 MPa; and (3) strike-slip fault (SF): = 76 MPa, = 55 MPa, = 65 MPa. Maximum principal in situ stress azimuth: N45° E.
4.1. Wellbore Degree of Collapse Evaluation
4.1.1. Normal Fault Regimes
4.1.2. Reverse Fault Regimes
4.1.3. Strike-Slip Fault Regimes
4.2. Collapse Pressure Gradient under Moderate Collapse Condition
4.3. Collapse Pressure Gradient in the Shale Cap at Different Locations away from the Depleted Reservoir
4.4. New Wellbore Stability Evaluation and Drilling Design Optimization
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
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Zhao, K.; Han, J.; Dou, L.; Feng, Y. Moderate Collapse in a Shale Cap of a Nearly Depleted Reservoir. Energies 2017, 10, 1820. https://doi.org/10.3390/en10111820
Zhao K, Han J, Dou L, Feng Y. Moderate Collapse in a Shale Cap of a Nearly Depleted Reservoir. Energies. 2017; 10(11):1820. https://doi.org/10.3390/en10111820
Chicago/Turabian StyleZhao, Kai, Jiyong Han, Liangbin Dou, and Yongcun Feng. 2017. "Moderate Collapse in a Shale Cap of a Nearly Depleted Reservoir" Energies 10, no. 11: 1820. https://doi.org/10.3390/en10111820