Sai Zeng, Angran Xiao, et al.
CAD Computer Aided Design
Suppressing the effects of liquid loading is a key issue for efficient utilization of mid and late-life wells in shale-gas systems. This state of the wells can be prevented by performing short shut-ins when the gas rate falls below the minimum rate needed to avoid liquid loading. In this paper, we present a Lagrangian relaxation scheme for shut-in scheduling of distributed shale multi-well systems. The scheme optimizes shut-in times and a reference rate for each multi-well pad, such that the total produced rate tracks a given short-term gas demand for the field. By using simple, frequency-tuned well proxy models, we obtain a compact mixed-integer formulation which by Lagrangian relaxation renders a decomposable structure. A set of computational tests demonstrates the merits of the proposed scheme. This study indicates that the method is capable of solving large field-wide scheduling problems by producing good solutions in reasonable computation times. © 2014 Elsevier Ltd.
Sai Zeng, Angran Xiao, et al.
CAD Computer Aided Design
Maurice Hanan, Peter K. Wolff, et al.
DAC 1976
Inbal Ronen, Elad Shahar, et al.
SIGIR 2009
Daniel M. Bikel, Vittorio Castelli
ACL 2008