Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
Analytical solutions that include real gas pseudo pressures are presented for pressure drawdown and buildup analysis of pressure drawdown and buildup analysis of horizontal wells in anisotropic reservoirs with tectonic, regional or contractional natural fractures. The reservoir might be limited by parallel sealed boundaries. The solutions have been obtained with the use of Fourier and Laplace transforms. Wellbore storage has been handled using a finite difference scheme of the convolution integral. These solutions have led to the identification of the following flow periods: periods:1. Wellbore storage which might mask many of the subsequent flowperiods.2. A first radial flow period at early times from the natural fractures into the horizontal well. This occurs in a verticalplane.3. A transition period due to flow from the matrix into the naturalfractures.4. A second radial flow period, still in a vertical plane, which starts when pressures in matrix and fractures reach an equilibrium. This pressure equilibrium can also be attainedat a later flow period in which case the second radial period would not be present.5. A linear flow period when the pressure transient reaches the upper and lower boundaries of the reservoir.6. A pseudo radial flow period towards the wellbore in a horizontal plane.7. A linear flow period when the pressure transient reaches the outer parallel boundaries. It is concluded that recognition of these flow periods can lead to calculation of p i or p*, permeabilities in the x, y and z directions, storativity ratio omega, average distance between natural fractures, fracture porosity, fracture aperture, skin, and pseudo skin due to vertical and horizontal partial penetration. Calculations are illustrated with an example. Introduction Horizontal wells are coming of age and they should prove very important in the development of naturally fractured reservoirs. Previous publications by these authors considered transient pressure analysis of horizontal wells in anisotropic naturally fractured reservoirs. This paper extends our previous work to the case of horizontal gas wells. A literature survey indicated that only a few papers have been published on the area of horizontal gas wells and most of them deal with type curves or numerical simulation work, for single-porosity systems. P. 155
Analytical solutions that include real gas pseudo pressures are presented for pressure drawdown and buildup analysis of pressure drawdown and buildup analysis of horizontal wells in anisotropic reservoirs with tectonic, regional or contractional natural fractures. The reservoir might be limited by parallel sealed boundaries. The solutions have been obtained with the use of Fourier and Laplace transforms. Wellbore storage has been handled using a finite difference scheme of the convolution integral. These solutions have led to the identification of the following flow periods: periods:1. Wellbore storage which might mask many of the subsequent flowperiods.2. A first radial flow period at early times from the natural fractures into the horizontal well. This occurs in a verticalplane.3. A transition period due to flow from the matrix into the naturalfractures.4. A second radial flow period, still in a vertical plane, which starts when pressures in matrix and fractures reach an equilibrium. This pressure equilibrium can also be attainedat a later flow period in which case the second radial period would not be present.5. A linear flow period when the pressure transient reaches the upper and lower boundaries of the reservoir.6. A pseudo radial flow period towards the wellbore in a horizontal plane.7. A linear flow period when the pressure transient reaches the outer parallel boundaries. It is concluded that recognition of these flow periods can lead to calculation of p i or p*, permeabilities in the x, y and z directions, storativity ratio omega, average distance between natural fractures, fracture porosity, fracture aperture, skin, and pseudo skin due to vertical and horizontal partial penetration. Calculations are illustrated with an example. Introduction Horizontal wells are coming of age and they should prove very important in the development of naturally fractured reservoirs. Previous publications by these authors considered transient pressure analysis of horizontal wells in anisotropic naturally fractured reservoirs. This paper extends our previous work to the case of horizontal gas wells. A literature survey indicated that only a few papers have been published on the area of horizontal gas wells and most of them deal with type curves or numerical simulation work, for single-porosity systems. P. 155
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.