A Novel Model Incorporating Geomechanics for a Horizontal Well in a Naturally Fractured Reservoir

Energies

Lun Zhao¹  Wenqi Zhao¹  Guoqiang Xing¹  Mingxian Wang¹  Zifei Fan¹  Heng Song¹ 

[1] Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;

关键词: geomechanical property;    elasticity parameter;    horizontal well;    naturally fractured reservoir;    transient response;    North Truva field;   

DOI  :  10.3390/en11102584

来源: DOAJ

【 摘 要 】

Fracture aperture of a fractured reservoir can be affected by both matrix elasticity and fracture compressibility when the reservoir pressure decreases, namely stress sensitivity. An elasticity parameter coupling Young’s modulus and Poisson’s ratio was introduced to reflect this geomechanical behavior, and a new model incorporating geomechanics was developed to analyze the flow behavior of a horizontal well in a naturally fractured reservoir. Pressure solutions for two cases—uniform-flux and infinite-conductivity—were derived, respectively. For the uniform-flux case, the effect of dimensionless elasticity parameter on the pressure-drop profile becomes stronger with continuing production, and the profile may be like a bow. Nine flow regimes can be observed on the transient response of the infinite-conductivity case. Stress sensitivity mainly affects the late-flow period and a larger dimensionless elasticity parameter causes a greater pressure drop. Due to stress sensitivity, the pressure derivative curve exhibits an upward tendency in the pseudo-radial flow regime, and the slope is greater than “1” in the pseudo-steady flow regime. For KT-I formation in the North Truva field, its elasticity parameter decreases with the increase of Young’s modulus or Poisson’s ratio and ranges from 8 × 10−8 Pa−1 to 1.1 × 10−7 Pa−1. Meanwhile, the transient response of H519 has a slight negative correlation with Young’s modulus and Poisson’s ratio in the pseudo-steady flow regime.

【 授权许可】

Unknown