Open Access Articles


Contact Us

Advances in Geo-Energy Research

Ausasia Science and Technology Press, Australia

E-mail: ager2017@126.com

Our Visitors

164614 visitors Look details

Performance of horizontal wells in composite tight gas reservoirs considering stress sensitivity

Kui Zhao, Peng Du

(Published: 2019-08-09)


Corresponding Author and Email:Kui Zhao, zhaokui716@163.com; ORCID: https://orcid.org/0000-0001-7709-3514


Citation:Zhao, K., Du, P. Performance of horizontal wells in composite tight gas reservoirs considering stress sensitivity. Advances in Geo-Energy Research, 2019, 3(3): 287-303, doi: 10.26804/ager.2019.03.07.


Article Type:Original article


Abstract:

Tight gas reservoir (TGR) plays an important role in unconventional oil and gas resources. The existing seepage models for TGR rarely consider the effects of heterogeneity, stress-sensitivity, and the unsteady fluid exchange between matrix and fracture. Heterogeneity is common for tight gas reservoir which should be carefully considered in geological model. The stress-sensitivity effect of fracture is an important factor influencing the transient flow behavior of TGR. Ultra-low porosity and permeability cause the unsteady flow between matrix and fractures systems. So this paper introduced a mathematical model for the horizontal well in a dual-porosity composite tight gas reservoir with considering the stress-sensitivity effect and unsteady flow between matrix and fractures systems. Some mathematical methods including the finite Fourier cosine transform, perturbation technique, Laplace transform, superposition principle, Stehfest numerical inversion algorithm are used to solve the nonlinear partial differential equation. Different flow regimes are divided based on pressure transient analysis curves. The sensitivity analysis of related parameters is studied according to pressure transient analysis and rate transient analysis curves. The presented model and obtained results in this paper give better understanding on pressure and rate transient behaviors of composite TGR.


Keywords:Heterogeneity, stress-sensitivity, unsteady fluid exchange, mathematical model, flow regimes, sensitivity analysis.


Views:273
Downloads:123



Download this Manuscript:PDF

Copyright ©2016. All Rights Reserved
E-mail: ager2017@126.com