Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Guoqiang Xing, Mingxian Wang, Shuhong Wu, Hua Li, Jiangyan Dong and Wenqi Zhao
Additional contact information
Guoqiang Xing: Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
Mingxian Wang: Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
Shuhong Wu: Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
Hua Li: Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
Jiangyan Dong: Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China
Wenqi Zhao: Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China

Energies, 2019, vol. 12, issue 12, 1-27

Abstract: Many oil wells in closed reservoirs continue to produce in the pseudo-steady-state flow regime for a long time. The principal objective of this work is to investigate the characteristics of two key pseudo-steady-state parameters—pseudo-steady-state constant ( b Dpss ) and pseudo-skin factor (S)—for a well penetrated by a fracture with an azimuth angle ( θ ) in an anisotropic reservoir. Firstly, a general analytical pressure solution for a finite-conductivity fracture with or without an azimuth angle in an anisotropic rectangular reservoir was developed by using the point-source function and spatial integral method, and two typical cases were employed to verify this solution. Secondly, with the asymptotic analysis method, the expressions of pseudo-steady-state constant and pseudo-skin factor were obtained on the basis of their definitions, and the effects of permeability anisotropy, fracture azimuth angle, fracture conductivity and reservoir shape on them were discussed in detail. Results show that all the b Dpss - θ and S- θ curves are symmetric around the vertical line, θ = 90° and form a hump or groove shape. The optimized fracture direction in an anisotropic reservoir is perpendicular to the principal permeability axis. Furthermore, a new formula to calculate pseudo-skin factor was successfully proposed based on these two parameters’ relationship. Finally, as an application of pseudo-steady-state constant, a set of Blasingame format rate decline curves for the proposed model were established.

Keywords: pseudo-steady-state flow; anisotropic reservoir; fracture azimuth angle; pseudo-steady-state constant; pseudo-skin factor; Blasingame format decline curves (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/12/2449/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/12/2449/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:12:p:2449-:d:242829

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().