A Parametric Study on the Benefits of Drilling Horizontal and Multilateral Wells in Coalbed Methane Reservoirs
- Nikola Maricic (Chevron Corp.) | Shahab D. Mohaghegh (West Virginia University) | Emre Artun (West Virginia University)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- December 2008
- Document Type
- Journal Paper
- 976 - 983
- 2008. Society of Petroleum Engineers
- 4.6 Natural Gas, 5.4.2 Gas Injection Methods, 5.8.3 Coal Seam Gas, 5.1 Reservoir Characterisation, 1.6.6 Directional Drilling, 5.5 Reservoir Simulation, 2 Well Completion, 1.6 Drilling Operations
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Recent years have witnessed a renewed interest in development of coalbed methane (CBM) reservoirs. Optimizing CBM production is of interest to many operators. Drilling horizontal and multilateral wells is gaining popularity in many different coalbed reservoirs, with varying results. This study concentrates on variations of horizontal- and multilateral-well configurations and their potential benefits.
In this study, horizontal and several multilateral drilling patterns for CBM reservoirs are studied. The reservoir parameters that have been studied include gas content, permeability, and desorption characteristics. Net present value (NPV) has been used as the yard stick for comparing different drilling configurations. Configurations that have been investigated are single-, dual-, tri-, and quadlateral wells along with fishbone (also known as pinnate) wells. In these configurations, the total length of horizontal wells and the spacing between laterals (SBL) have been studied. It was determined that in the cases that have been studied in this paper (all other circumstances being equal), quadlateral wells are the optimum well configuration.
Several studies in the past have examined the impact of different reservoir properties on CBM production (Ertekin et al. 1988; Zuber 1998; Katyal et al. 2007), including the effect of secondary (micro-) permeability (Gamson et al. 1993; Mavor and Gunter 2006; Palmer et al. 2006). This paper is dedicated to examining the impact of different horizontal-well configurations (multilateral) on the production and recovery in CBM reservoirs.
In this section, a brief background on reservoir-engineering aspects of CBM production is presented along with details on the reservoir simulator used for modeling the cases used in this study. Some basic introduction about horizontal wells and their impact on production behavior is also presented.
|File Size||3 MB||Number of Pages||8|
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