Gas Field Design – Well Pads with a Single Well In the coal seam gas (CSG) industry, natural gas is extracted from underground coal seams via wells drilled from the surface down into the coal seam. To maximise the potential volume of gas for extraction, the wells are drilled in a grid-like pattern across the well field. The location of individual wells may be adjusted to suit the local topography.
The gas from the wells is collected in a gathering network. The network gathers both gas and water from each well. It brings the gas and water to central processing plants. The gathering network consists of separate pipe lines for gas and water. The network may include an electrical distribution system where the well field is electrically powered.
Typically a single well is drilled on an individual well pad. The preparation for gas production involves many different activities:
Advances in Drilling Technology – Well Pads with Multiple Wells Advances in drilling technologies have made viable the directional drilling of the well. The application of directional drilling allows multiple wells to be located in a cluster on a single well pad, with financial and operational benefits.
Automatic Power Management One benefit is that the instead of providing a dedicated power generator for each well, two generators may be used to power up multiple wells on the single well pad.
To maximise availability and to increase gas production, the generators may be configured for automatic power management, including automatic run-hours equalisation.
The automatic power management has one generator online at all times, with the second unit being dispatched if the power requirements of the well pad become too high for a single generator. Automatic run-hours equalisation changes which generator is online so that the total running hours on each generator is approximately equal, or the difference in running hours does not exceed a configurable set point.
BESST Services BESST has the experience to be able to provide the design, configuration and commissioning services for the electrical and control systems for generators to allow automatic power management and run hours equalisation.