Coal-Seam-Gas Reservoir Surveillance—Extracting Value From Suspended Coreholes, Surat Basin, Queensland, Australia
- Stuart R. Young (QGC (A BG Group company)) | Gerard F.C. Norton (QGC (A BG Group company)) | Ken Jun Foo (QGC (A BG Group company))
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2014
- Document Type
- Journal Paper
- 88 - 96
- 2014.Society of Petroleum Engineers
- 4.6.2 Liquified Natural Gas (LNG), 3.3 Well & Reservoir Surveillance and Monitoring, 1.14 Casing and Cementing, 1.6 Drilling Operations, 5.8.3 Coal Seam Gas, 4.6 Natural Gas, 4.3.4 Scale
- Pressure gauge, Reservoir surveillance, Coal Seam Gas, Completion
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- 465 since 2007
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In 2009, QGC (a BG Group company), began developing coal-seam-gas (CSG) feedstock for its new liquefied-natural-gas (LNG) plant and required a subsurface model and field-development plan to underpin the investment case for the project. Fundamental to the modeling process was acquiring appropriate data to calibrate subsurface models and enhance confidence in their predictive quality. As part of an integrated reservoir-surveillance strategy, specific pressure- and temperature-monitoring wells were required. This paper describes the successful laboratory and field implementation of an innovative completion technique that converts suspended coreholes into reservoir- and aquifer-monitoring wells. The coreholes are re-entered, and vibrating wire piezometers attached to capillary coiled tubing are positioned and cemented in place alongside selected reservoir intervals. The well is then “plugged and abandoned” and the lease remediated to leave only a small surface footprint for the data logger and telemetry. The cement is effectively impermeable to fluid movement, but possesses sufficient permeability to transmit reservoir pore pressure to an adjacent piezometer. Recompletion of coreholes provides a cost-effective means of acquiring valuable downhole data while eliminating the need to drill a well specifically for monitoring in the same vicinity. Data gathered over the reservoir interval (the Walloon Coal Measures) can inform and help resolve reservoir properties on a regional scale, enhance understanding of the contribution to flow, and provide data points to pressure match a reservoir model. Data gathered over the aquifers within Springbok sandstone and Gubbermunda sandstone enable estimates of any CSG-production effects on groundwater.
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