Numerical Simulation of Temporal and Spatial Evolution of Stress Field in Unconsolidated Sandstone Oil Reservoir

Abstract Casing damage in the process of oilfield development is a serious problem, which is affected by geological structure, production technology and many other factors. To prevent casing damage, it is necessary to master the space-time evolution law of reservoir in-situ stress field, to provide support for casing damage prevention. Based on the perseage-stress coupling theory, taking the actual reservoir block as the research object, the change law of the in-situ stress field in unconsolidated sandstone reservoir is obtained through the fluid-solid coupling numerical simulation of the reservoir, and the internal correlation between the stress field and casing damage is analysed. The research results provide theoretical guidance for the formulation of casing damage prevention measures in the research block.

Download Full-text

Numerical simulation of the influence of stimulated reservoir volume on in-situ stress field

Journal of Natural Gas Science and Engineering ◽

10.1016/j.jngse.2016.03.040 ◽

2016 ◽

Vol 36 ◽

pp. 1228-1238 ◽

Cited By ~ 10

Author(s):

Tiejun Lin ◽

Hao Yu ◽

Zhanghua Lian ◽

Yonggang Yi ◽

Qiang Zhang

Keyword(s):

Numerical Simulation ◽

Stress Field ◽

In Situ Stress ◽

Stimulated Reservoir Volume ◽

Reservoir Volume ◽

In Situ Stress Field

Download Full-text

3D numerical simulation of heterogeneous in situ stress field in low-permeability reservoirs

Petroleum Science ◽

10.1007/s12182-019-00360-w ◽

2019 ◽

Vol 16 (5) ◽

pp. 939-955 ◽

Cited By ~ 3

Author(s):

Jianwei Feng ◽

Lin Shang ◽

Xizhe Li ◽

Peng Luo

Keyword(s):

Numerical Simulation ◽

Stress Field ◽

In Situ Stress ◽

Low Permeability ◽

3D Numerical Simulation ◽

In Situ Stress Field ◽

Low Permeability Reservoirs

Download Full-text

A numerical study on the regional in situ stress field of the Keshen section and interface dislocation in the composite salt-gypsum layer

Interpretation ◽

10.1190/int-2019-0191.1 ◽

2020 ◽

Vol 8 (4) ◽

pp. T803-T811

Author(s):

Shiyuan Li ◽

Fuyao Li ◽

Yufan Qiu ◽

Yu Yan

Keyword(s):

Stress Field ◽

Numerical Study ◽

In Situ Stress ◽

Wellbore Integrity ◽

Salt Layer ◽

Gypsum Formation ◽

Casing Damage ◽

The Stability ◽

In Situ Stress Field

Salt rock found in the stratum of the sedimentary basin is considered to be exemplary in terms of quality among the class of cap rocks, and it engulfs a certain proportion of the world’s hydrocarbon resources. In recent years, approximately 40% of newly discovered hydrocarbon resources in China have been detected under deep salt layers. Statistics suggest that nearly 40% of drilling accidents and 50% of casing damage incidents occur near the layer interfaces within a composite salt-gypsum formation. For the in-depth characterization of processes such as deformation and damages occurring at the interfaces, analysis of the regional in situ stress field characteristics and distribution in salt structures is vital. For this purpose, the structure of the Keshen section of the Kelasu structural belt under the Tarim Oilfield was studied. Our study establishes a geomechanical model, which tends to be mainly based on constitutive elastic and rheological models (applicable to different layers, i.e., the upper salt layer, salt layer, and presalt layer). Furthermore, the stability of the composite salt-gypsum layer and prediction of formation stress were evaluated. Investigation of drilling accidents and wellbore integrity problems revealed that the perturbation at the interfaces was not earnestly contemplated. The results show a discontinuous pattern in the regional in situ stress distribution in all of the salt layers. The salt layer is characterized by creep behavior with differential stress of less than 1.0 MPa. The interface between the upper layer and the salt layer tends to bear inconsistent deformation of approximately a few centimeters along the wellbore wall.

Download Full-text